Radojević, R. L., Petrović, D. V., Mileusnić, Z. I., Barać, S.,& Vuković, A.. (2023). Rekonstrukcija polunošenog kombajna za ubiranje jagodastog voća u samohodni za mala i srednja poljoprivredna gazdinstva. in MNO za Mašinstvo i industrijski softver
MINISTARSTVO PROSVETE, NAUKE I TEHNOLOŠKOG RAZVOJA REPUBLIKE SRBIJE., 1-31.
https://hdl.handle.net/21.15107/rcub_agrospace_6744

Radojević RL, Petrović DV, Mileusnić ZI, Barać S, Vuković A. Rekonstrukcija polunošenog kombajna za ubiranje jagodastog voća u samohodni za mala i srednja poljoprivredna gazdinstva. in MNO za Mašinstvo i industrijski softver. 2023;:1-31.
https://hdl.handle.net/21.15107/rcub_agrospace_6744 .

Radojević, Rade L., Petrović, Dragan V., Mileusnić, Zoran I., Barać, Saša, Vuković, Aleksandar, "Rekonstrukcija polunošenog kombajna za ubiranje jagodastog voća u samohodni za mala i srednja poljoprivredna gazdinstva" in MNO za Mašinstvo i industrijski softver (2023):1-31,
https://hdl.handle.net/21.15107/rcub_agrospace_6744 .

TY  - JOUR
AU  - Stanisavljević, Rade
AU  - Vuković, Aleksandar
AU  - Petrović, Dragan V.
AU  - Radojević, Rade L.
AU  - Barać, Saša
AU  - Mileusnić, Zoran
AU  - Tadić, Vjekoslav
PY  - 2021
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5925
AB  - This paper presents the tests results of three types of hay mowing machines (later in text: mowers), namely a self-propelled oscillatory mower-conditioner and two tractor-mounted mowers with oscillatory and rotary blades, used to mow alfalfa grown under dry land conditions in the region of central Serbia during three seasons in 2014, 2015 and 2016. Although characterized by older design, they are still commonly used at smaller and medium size farms in this region. Therefore, their optimal exploitation parameters are still of large importance for hay quality and production efficiency and sustainability. The exploitation parameters of all three mowers generally increased linearly with higher speeds, having high R2 values (over 0,8), with rare exceptions. The regression coefficients b clearly showed that the self-propelled mower-conditioner achieved maximum increase in production performance (b = 0,3606), compared with the oscillatory (b = 0,1158) and rotary mowers (b = 0,1414). Mower design had a significant (p ≤ 0,001) effect on cutting and chopping losses, production performance, and specific fuel consumption (p ≤ 0,05). The tests confirmed the superiority of the self-propelled mower over the two mowers aggregated with tractors.
PB  - Strojarski Facultet
T2  - Tehnicki Vjesnik
T1  - Efficiency of alfalfa hay mowing machines under the dryland conditions
EP  - 1510
IS  - 5
SP  - 1503
VL  - 28
DO  - 10.17559/TV-20200720092823
ER  - 

@article{
author = "Stanisavljević, Rade and Vuković, Aleksandar and Petrović, Dragan V. and Radojević, Rade L. and Barać, Saša and Mileusnić, Zoran and Tadić, Vjekoslav",
year = "2021",
abstract = "This paper presents the tests results of three types of hay mowing machines (later in text: mowers), namely a self-propelled oscillatory mower-conditioner and two tractor-mounted mowers with oscillatory and rotary blades, used to mow alfalfa grown under dry land conditions in the region of central Serbia during three seasons in 2014, 2015 and 2016. Although characterized by older design, they are still commonly used at smaller and medium size farms in this region. Therefore, their optimal exploitation parameters are still of large importance for hay quality and production efficiency and sustainability. The exploitation parameters of all three mowers generally increased linearly with higher speeds, having high R2 values (over 0,8), with rare exceptions. The regression coefficients b clearly showed that the self-propelled mower-conditioner achieved maximum increase in production performance (b = 0,3606), compared with the oscillatory (b = 0,1158) and rotary mowers (b = 0,1414). Mower design had a significant (p ≤ 0,001) effect on cutting and chopping losses, production performance, and specific fuel consumption (p ≤ 0,05). The tests confirmed the superiority of the self-propelled mower over the two mowers aggregated with tractors.",
publisher = "Strojarski Facultet",
journal = "Tehnicki Vjesnik",
title = "Efficiency of alfalfa hay mowing machines under the dryland conditions",
pages = "1510-1503",
number = "5",
volume = "28",
doi = "10.17559/TV-20200720092823"
}

Stanisavljević, R., Vuković, A., Petrović, D. V., Radojević, R. L., Barać, S., Mileusnić, Z.,& Tadić, V.. (2021). Efficiency of alfalfa hay mowing machines under the dryland conditions. in Tehnicki Vjesnik
Strojarski Facultet., 28(5), 1503-1510.
https://doi.org/10.17559/TV-20200720092823

Stanisavljević R, Vuković A, Petrović DV, Radojević RL, Barać S, Mileusnić Z, Tadić V. Efficiency of alfalfa hay mowing machines under the dryland conditions. in Tehnicki Vjesnik. 2021;28(5):1503-1510.
doi:10.17559/TV-20200720092823 .

Stanisavljević, Rade, Vuković, Aleksandar, Petrović, Dragan V., Radojević, Rade L., Barać, Saša, Mileusnić, Zoran, Tadić, Vjekoslav, "Efficiency of alfalfa hay mowing machines under the dryland conditions" in Tehnicki Vjesnik, 28, no. 5 (2021):1503-1510,
https://doi.org/10.17559/TV-20200720092823 . .

TY  - JOUR
AU  - Tomantschger, Kurt
AU  - Petrović, Dragan V.
AU  - Radojević, Rade L.
AU  - Tadić, Vjekoslav
PY  - 2021
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5927
AB  - One of the technical factors from agricultural nozzles and overall plant protection is droplet diameter, which exclusively depends on working pressure, ISO number and nozzle type. Therefore, this paper was aimed to describe mathematical model for droplet size distribution. Through field exploitation experiment, data was used from three ISO numbers of nozzles (hollow cone 80 015; 02 and 03), two air-assisted sprayers (axial and radial fan) and two permanent crops (vineyard and an apple orchard). Water sensitive papers were used for evaluation of droplet diameters, and digital image analysis with Image J software was used for data processing. Mathematical model through homogenous diffusion equation and simplified differential equation shows that droplet size distribution had exponential function of modelling. Theoretical mathematical model was confirmed in experimental results, where coefficient of determination of exponential regression model for 80 015 nozzles was 0.93 with 5.15 of RMSE. The same coefficient for 80 02 nozzles was 0.96 with 2.88 of RMSE and for 80 03 nozzle R2 was 0.93 with 3.25 of RMSE. In addition, it is proved that droplet diameter depends on operating pressure with very high negative correlation (80 03 nozzles: r = −0.98; 80 02 nozzles: r = −0.97; 80 015 nozzles: r = −0.95). This data will help future researchers in their papers to facilitate and describe similar models for plat protection processes, and all agricultural producers to determine optimal operating pressure which is immensely important in economic, biologic, technical and ecologic aspect.
PB  - Strojarski Facultet
T2  - Tehnicki Vjesnik
T1  - Mathematical Method for Droplet Size Distribution of Agricultural Nozzles
EP  - 1754
IS  - 5
SP  - 1749
VL  - 28
DO  - 10.17559/TV-20200428144856
ER  - 

@article{
author = "Tomantschger, Kurt and Petrović, Dragan V. and Radojević, Rade L. and Tadić, Vjekoslav",
year = "2021",
abstract = "One of the technical factors from agricultural nozzles and overall plant protection is droplet diameter, which exclusively depends on working pressure, ISO number and nozzle type. Therefore, this paper was aimed to describe mathematical model for droplet size distribution. Through field exploitation experiment, data was used from three ISO numbers of nozzles (hollow cone 80 015; 02 and 03), two air-assisted sprayers (axial and radial fan) and two permanent crops (vineyard and an apple orchard). Water sensitive papers were used for evaluation of droplet diameters, and digital image analysis with Image J software was used for data processing. Mathematical model through homogenous diffusion equation and simplified differential equation shows that droplet size distribution had exponential function of modelling. Theoretical mathematical model was confirmed in experimental results, where coefficient of determination of exponential regression model for 80 015 nozzles was 0.93 with 5.15 of RMSE. The same coefficient for 80 02 nozzles was 0.96 with 2.88 of RMSE and for 80 03 nozzle R2 was 0.93 with 3.25 of RMSE. In addition, it is proved that droplet diameter depends on operating pressure with very high negative correlation (80 03 nozzles: r = −0.98; 80 02 nozzles: r = −0.97; 80 015 nozzles: r = −0.95). This data will help future researchers in their papers to facilitate and describe similar models for plat protection processes, and all agricultural producers to determine optimal operating pressure which is immensely important in economic, biologic, technical and ecologic aspect.",
publisher = "Strojarski Facultet",
journal = "Tehnicki Vjesnik",
title = "Mathematical Method for Droplet Size Distribution of Agricultural Nozzles",
pages = "1754-1749",
number = "5",
volume = "28",
doi = "10.17559/TV-20200428144856"
}

Tomantschger, K., Petrović, D. V., Radojević, R. L.,& Tadić, V.. (2021). Mathematical Method for Droplet Size Distribution of Agricultural Nozzles. in Tehnicki Vjesnik
Strojarski Facultet., 28(5), 1749-1754.
https://doi.org/10.17559/TV-20200428144856

Tomantschger K, Petrović DV, Radojević RL, Tadić V. Mathematical Method for Droplet Size Distribution of Agricultural Nozzles. in Tehnicki Vjesnik. 2021;28(5):1749-1754.
doi:10.17559/TV-20200428144856 .

Tomantschger, Kurt, Petrović, Dragan V., Radojević, Rade L., Tadić, Vjekoslav, "Mathematical Method for Droplet Size Distribution of Agricultural Nozzles" in Tehnicki Vjesnik, 28, no. 5 (2021):1749-1754,
https://doi.org/10.17559/TV-20200428144856 . .

TY  - JOUR
AU  - Petrović, Dragan
AU  - Cerović, Vera B.
PY  - 2020
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5467
AB  - This paper presents the fifth part of the serie, which presents the graphic designations, i.e. symbols, of the most of standard components of hydraulic systems according to current international standards (ISO). This work is focused to the symbols for simplified presentation on the hydraulic diagrams of the associated components intended for the storage and conditioning of hydraulic oil, and for the storage of energy delivered to the oil as working fluid by hydraulic pumps. The function of oil storage is provided by appropriate hydraulic tanks and the hydraulic energy is stored by means of oil-hydraulic accumulators. Symbols of components for maintaining hydraulic oil operating parameters within optimum limits are also shown. The components also included in this presentation are specified for: purification (oil-hydraulic filters), heating (preheaters/heaters) and cooling (oil-hydraulic coolers).
AB  - Ovaj rad predstavlja peti deo serije u kome su prikazane grafičke oznake (simboli) većine standardnih komponenata hidrauličkih sistema prema važećim međunarodnim tehničkim standardima (ISO). Prikaz je fokusiran na simbole kojima se na hidrauličkim šemama uprošćeno predstavljaju pripadajuće komponente namenjene skladištenju, prečišćavanju i kondicioniranju hidrauličkog ulja, te za skladištenje energije predate hidrauličkom ulju, kao radnoj tečnosti, od strane izvornih organa (hidrauličkih pumpi). Funkciju skladištenja ulja obavljaju hidraulički rezervoari, a hidraulička energija se skladišti pomoću uljno-hidrauličkih akumulatora. Simboli komponenata za održavanje radnih parametara hidrauličkog ulja u optimalnim granicama su takođe prikazani. Obuhvaćene su komponente namenjene: prečišćavanju (uljno-hidraulički filteri), grejanju (predgrejači/grejači) i hlađenju (uljno-hidraulički hladnjaci).
PB  - Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd
T2  - Poljoprivredna tehnika
T1  - Hydraulic symbols: Part five: Auxilliary componets
T1  - Hidraulički simboli - deo V - "Pribor"
EP  - 9
IS  - 1
SP  - 1
VL  - 45
DO  - 10.5937/PoljTeh2001001P
ER  - 

@article{
author = "Petrović, Dragan and Cerović, Vera B.",
year = "2020",
abstract = "This paper presents the fifth part of the serie, which presents the graphic designations, i.e. symbols, of the most of standard components of hydraulic systems according to current international standards (ISO). This work is focused to the symbols for simplified presentation on the hydraulic diagrams of the associated components intended for the storage and conditioning of hydraulic oil, and for the storage of energy delivered to the oil as working fluid by hydraulic pumps. The function of oil storage is provided by appropriate hydraulic tanks and the hydraulic energy is stored by means of oil-hydraulic accumulators. Symbols of components for maintaining hydraulic oil operating parameters within optimum limits are also shown. The components also included in this presentation are specified for: purification (oil-hydraulic filters), heating (preheaters/heaters) and cooling (oil-hydraulic coolers)., Ovaj rad predstavlja peti deo serije u kome su prikazane grafičke oznake (simboli) većine standardnih komponenata hidrauličkih sistema prema važećim međunarodnim tehničkim standardima (ISO). Prikaz je fokusiran na simbole kojima se na hidrauličkim šemama uprošćeno predstavljaju pripadajuće komponente namenjene skladištenju, prečišćavanju i kondicioniranju hidrauličkog ulja, te za skladištenje energije predate hidrauličkom ulju, kao radnoj tečnosti, od strane izvornih organa (hidrauličkih pumpi). Funkciju skladištenja ulja obavljaju hidraulički rezervoari, a hidraulička energija se skladišti pomoću uljno-hidrauličkih akumulatora. Simboli komponenata za održavanje radnih parametara hidrauličkog ulja u optimalnim granicama su takođe prikazani. Obuhvaćene su komponente namenjene: prečišćavanju (uljno-hidraulički filteri), grejanju (predgrejači/grejači) i hlađenju (uljno-hidraulički hladnjaci).",
publisher = "Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd",
journal = "Poljoprivredna tehnika",
title = "Hydraulic symbols: Part five: Auxilliary componets, Hidraulički simboli - deo V - "Pribor"",
pages = "9-1",
number = "1",
volume = "45",
doi = "10.5937/PoljTeh2001001P"
}

Petrović, D.,& Cerović, V. B.. (2020). Hydraulic symbols: Part five: Auxilliary componets. in Poljoprivredna tehnika
Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd., 45(1), 1-9.
https://doi.org/10.5937/PoljTeh2001001P

Petrović D, Cerović VB. Hydraulic symbols: Part five: Auxilliary componets. in Poljoprivredna tehnika. 2020;45(1):1-9.
doi:10.5937/PoljTeh2001001P .

Petrović, Dragan, Cerović, Vera B., "Hydraulic symbols: Part five: Auxilliary componets" in Poljoprivredna tehnika, 45, no. 1 (2020):1-9,
https://doi.org/10.5937/PoljTeh2001001P . .

TY  - JOUR
AU  - Dimitrijević, Aleksandra
AU  - Gavrilović, Marija
AU  - Ivanović, Sanjin
AU  - Mileusnić, Zoran
AU  - Miodragović, Rajko
AU  - Todorović, Saša
PY  - 2020
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5375
AB  - Increased demand for food production, influenced by the constant growth of population, resulted in the agricultural production systems that are more energy and economy intensive. The aim of this study was to evaluate the energetic and economic efficiency of sugar beet and wheat production. Attention was given to the fertilizer usage and its share in energy consumption since it can amount to 50%. Data show that energy input in wheat production was 5.84 MJ.kg(-1) and in sugar beet it was 0.93 MJ.kg(-1). The highest share of energy input both in wheat and sugar beet was observed for fertilizers, 52.45% and 46.70%, respectively. Economic analysis has shown that wheat production is a low profitable production with a net return of only 20.69 USD.ha(-1), in comparison with sugar beet production with a net return of 513.53 USD.ha(-1). Costs related to the fertilizer use prevailed in total variable and total production costs. Economic analysis has also shown that the benefit-to-cost ratio was higher in sugar beet production (1.33) compared to wheat production (1.03). Furthermore, it was determined that these economic indicators were less sensitive in sugar beet production than in wheat production regarding the variation of fertilizer.
PB  - MDPI, BASEL
T2  - Energies
T1  - Energy Use and Economic Analysis of Fertilizer Use in Wheat and Sugar Beet Production in Serbia
IS  - 9
VL  - 13
DO  - 10.3390/en13092361
ER  - 

@article{
author = "Dimitrijević, Aleksandra and Gavrilović, Marija and Ivanović, Sanjin and Mileusnić, Zoran and Miodragović, Rajko and Todorović, Saša",
year = "2020",
abstract = "Increased demand for food production, influenced by the constant growth of population, resulted in the agricultural production systems that are more energy and economy intensive. The aim of this study was to evaluate the energetic and economic efficiency of sugar beet and wheat production. Attention was given to the fertilizer usage and its share in energy consumption since it can amount to 50%. Data show that energy input in wheat production was 5.84 MJ.kg(-1) and in sugar beet it was 0.93 MJ.kg(-1). The highest share of energy input both in wheat and sugar beet was observed for fertilizers, 52.45% and 46.70%, respectively. Economic analysis has shown that wheat production is a low profitable production with a net return of only 20.69 USD.ha(-1), in comparison with sugar beet production with a net return of 513.53 USD.ha(-1). Costs related to the fertilizer use prevailed in total variable and total production costs. Economic analysis has also shown that the benefit-to-cost ratio was higher in sugar beet production (1.33) compared to wheat production (1.03). Furthermore, it was determined that these economic indicators were less sensitive in sugar beet production than in wheat production regarding the variation of fertilizer.",
publisher = "MDPI, BASEL",
journal = "Energies",
title = "Energy Use and Economic Analysis of Fertilizer Use in Wheat and Sugar Beet Production in Serbia",
number = "9",
volume = "13",
doi = "10.3390/en13092361"
}

Dimitrijević, A., Gavrilović, M., Ivanović, S., Mileusnić, Z., Miodragović, R.,& Todorović, S.. (2020). Energy Use and Economic Analysis of Fertilizer Use in Wheat and Sugar Beet Production in Serbia. in Energies
MDPI, BASEL., 13(9).
https://doi.org/10.3390/en13092361

Dimitrijević A, Gavrilović M, Ivanović S, Mileusnić Z, Miodragović R, Todorović S. Energy Use and Economic Analysis of Fertilizer Use in Wheat and Sugar Beet Production in Serbia. in Energies. 2020;13(9).
doi:10.3390/en13092361 .

Dimitrijević, Aleksandra, Gavrilović, Marija, Ivanović, Sanjin, Mileusnić, Zoran, Miodragović, Rajko, Todorović, Saša, "Energy Use and Economic Analysis of Fertilizer Use in Wheat and Sugar Beet Production in Serbia" in Energies, 13, no. 9 (2020),
https://doi.org/10.3390/en13092361 . .

TY  - JOUR
AU  - Koprivica, Ranko
AU  - Veljković, Biljana
AU  - Radivojević, D.
AU  - Dedić, T.
AU  - Mileusnić, Zoran
AU  - Djokić, Dragoslav
PY  - 2020
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5420
AB  - The paper presents the results of testing equipment at family farms with agricultural machinery in Northwest Montenegro in municipalities Pljevlja, Žabljak, Kolašin and Mojkovac. In the mentioned municipalities, 123 agricultural farms in 65 villages were surveyed. The total area of available land on farms is 1612.08 ha, of which only 8.27% are cultivated and the rest meadows and pastures. The average area of family farms is 13.11 ha of used agricultural land, which is three times more than the average in Montenegro. Single-axle tractors with an engine power of 5-10 kW are represented by 16% of the total number of tractors. Family farms are not sufficiently equipped with two-axle tractors, because every other one has a tractor (0.51 tractors per farm). The tractors are average power of 30.12 kW. Energy equipments in the surveyed area, expressed through the nominal engine power of two-axle tractors per unit area, in averages at 1.18 kW / ha. There’s a shortage of tractors with engine power over 50 kW with rear and front wheel drive (double traction). Family farms are insufficiently equipped with attached machines (1.28 machines / farm). Ratios per one two-axle tractor are 2.49 attachments and 10.27 ha of used land. There is a lack of machines for vertical tillage and combined machines for pre-sowing soil preparation (chisel plows, seed drills, rotary harrows), as well a seeder for small grains and corn. In addition, there is a lack of machines for the preparation of silage and haylage in silage facilities (self-loading trailers and combines), as well roll presses, wrappers and catchers wrapped in foil.
PB  - University of Montenegro
T2  - Agriculture and Forestry
T1  - Equipment of family farms with agricultural mechanization in northwest of montenegro
EP  - 239
IS  - 3
SP  - 231
VL  - 66
DO  - 10.17707/AgricultForest.66.3.19
ER  - 

@article{
author = "Koprivica, Ranko and Veljković, Biljana and Radivojević, D. and Dedić, T. and Mileusnić, Zoran and Djokić, Dragoslav",
year = "2020",
abstract = "The paper presents the results of testing equipment at family farms with agricultural machinery in Northwest Montenegro in municipalities Pljevlja, Žabljak, Kolašin and Mojkovac. In the mentioned municipalities, 123 agricultural farms in 65 villages were surveyed. The total area of available land on farms is 1612.08 ha, of which only 8.27% are cultivated and the rest meadows and pastures. The average area of family farms is 13.11 ha of used agricultural land, which is three times more than the average in Montenegro. Single-axle tractors with an engine power of 5-10 kW are represented by 16% of the total number of tractors. Family farms are not sufficiently equipped with two-axle tractors, because every other one has a tractor (0.51 tractors per farm). The tractors are average power of 30.12 kW. Energy equipments in the surveyed area, expressed through the nominal engine power of two-axle tractors per unit area, in averages at 1.18 kW / ha. There’s a shortage of tractors with engine power over 50 kW with rear and front wheel drive (double traction). Family farms are insufficiently equipped with attached machines (1.28 machines / farm). Ratios per one two-axle tractor are 2.49 attachments and 10.27 ha of used land. There is a lack of machines for vertical tillage and combined machines for pre-sowing soil preparation (chisel plows, seed drills, rotary harrows), as well a seeder for small grains and corn. In addition, there is a lack of machines for the preparation of silage and haylage in silage facilities (self-loading trailers and combines), as well roll presses, wrappers and catchers wrapped in foil.",
publisher = "University of Montenegro",
journal = "Agriculture and Forestry",
title = "Equipment of family farms with agricultural mechanization in northwest of montenegro",
pages = "239-231",
number = "3",
volume = "66",
doi = "10.17707/AgricultForest.66.3.19"
}

Koprivica, R., Veljković, B., Radivojević, D., Dedić, T., Mileusnić, Z.,& Djokić, D.. (2020). Equipment of family farms with agricultural mechanization in northwest of montenegro. in Agriculture and Forestry
University of Montenegro., 66(3), 231-239.
https://doi.org/10.17707/AgricultForest.66.3.19

Koprivica R, Veljković B, Radivojević D, Dedić T, Mileusnić Z, Djokić D. Equipment of family farms with agricultural mechanization in northwest of montenegro. in Agriculture and Forestry. 2020;66(3):231-239.
doi:10.17707/AgricultForest.66.3.19 .

Koprivica, Ranko, Veljković, Biljana, Radivojević, D., Dedić, T., Mileusnić, Zoran, Djokić, Dragoslav, "Equipment of family farms with agricultural mechanization in northwest of montenegro" in Agriculture and Forestry, 66, no. 3 (2020):231-239,
https://doi.org/10.17707/AgricultForest.66.3.19 . .

TY  - JOUR
AU  - Dimitrijević, Aleksandra
AU  - Gavrilović, Marija
AU  - Mileusnić, Zoran
AU  - Miodragović, Rajko
PY  - 2020
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5492
AB  - The efficiency of primary agricultural production is under constant analysis relative to energy, economy and ecology. Notwithstanding technological innovations in agricultural production, engineers and researchers are still seeking to create a production system that would render the primary agricultural production more energy efficient and ecologically sustainable. The purpose of this paper is to examine the energy consumption and efficiency of crop production with an emphasis on the importance of mineral fertilizers and their influence on the overall energy consumption. The results obtained indicate that mineral fertilizers claim a share of the total energy consumption in crop production ranging from 40.53 % in sunflowers to 55.19 % in maize. A statistically significant correlation was found between the energy inputs for fertilizers and crop yields. The regression analysis performed showed a positive correlation between the energy inputs for fertilizers and yields in all the crops considered, with the exception of wheat.
AB  - Efikasnost primarne poljoprivredne proizvodnje je predmet konstantnih analiza, kako energetskih tako i ekonomskih i ekoloških. Bez obzira na tehničko unapređenje proizvodnje, i dalje se traže proizvodni i tehnološko-tehnički sistemi koji će dati energetski efikasniju i ekološki održivu primarnu biljnu proizvodnju. U radu je prikazan bilans potrošnje energije u proizvodnji ratarskih kultura i skrenuta je pažnja na mineralna đubriva. Potrošnja energije je praćena u proizvodnji pšenice, kukuruza, semenskog suncokreta, šećerne repe i soje, tokom tri proizvodne sezone. Data je analiza potrošnje energije kroz sve postupke manipulacije mineralnim đubrivima do i od imanja pa do same aplikacije na parceli. Analizirana je zavisnost ukupnih energetskih inputa i prinosa i korelacija utroška mineralnog đubriva i outputa. Rezultati istraživanja pokazuju da mineralna đubriva, u energeskom bilansu ratarske proizvodnje, učestvuju sa 40,52% (semenski suncokret) pa do 55,19% (kukuruz). Najintenzivniji utrošak energije po jedinici površine zabeležen je u proizvodnji šećerne repe, 27848,9 MJ ha-1 dok je najmanje energije utrošeno kod soje, 11371,28 MJ ha-1. Proizvodnja šećerne repe je energetski najproduktivnija (1,58 kg MJ-1). Najviše energije, kod manipulacije i aplikacije đubriva, je utrošeno u proizvodnji pšenice, 14,54 MJ ha-1, a najmanje u proizvodnji soje, 3,23 MJ ha-1. Statistička analiza je pokazala da postoji korelacija između energije utrošene preko đubriva i samog prinosa ratarskih kultura. Funcionalna veza između inputa putem đubriva i prinosa je jaka u svim slučajevima osim kod soje. Regresione jednačine pokazuju pozitivnu zavisnost između prinosa i uložene energije preko đubriva, osim u slučaju pšenice i semenskog kukuruza.
PB  - Nacionalno društvo za procesnu tehniku i energetiku u poljoprivredi, Novi Sad
T2  - Journal on Processing and Energy in Agriculture
T1  - Energy efficiency of the mineral fertilizer application in crop production
T1  - Energetska efikasnost aplikacije mineralnih đubriva u proizvodnji ratarskih kultura
EP  - 30
IS  - 1
SP  - 26
VL  - 24
DO  - 10.5937/jpea24-25576
ER  - 

@article{
author = "Dimitrijević, Aleksandra and Gavrilović, Marija and Mileusnić, Zoran and Miodragović, Rajko",
year = "2020",
abstract = "The efficiency of primary agricultural production is under constant analysis relative to energy, economy and ecology. Notwithstanding technological innovations in agricultural production, engineers and researchers are still seeking to create a production system that would render the primary agricultural production more energy efficient and ecologically sustainable. The purpose of this paper is to examine the energy consumption and efficiency of crop production with an emphasis on the importance of mineral fertilizers and their influence on the overall energy consumption. The results obtained indicate that mineral fertilizers claim a share of the total energy consumption in crop production ranging from 40.53 % in sunflowers to 55.19 % in maize. A statistically significant correlation was found between the energy inputs for fertilizers and crop yields. The regression analysis performed showed a positive correlation between the energy inputs for fertilizers and yields in all the crops considered, with the exception of wheat., Efikasnost primarne poljoprivredne proizvodnje je predmet konstantnih analiza, kako energetskih tako i ekonomskih i ekoloških. Bez obzira na tehničko unapređenje proizvodnje, i dalje se traže proizvodni i tehnološko-tehnički sistemi koji će dati energetski efikasniju i ekološki održivu primarnu biljnu proizvodnju. U radu je prikazan bilans potrošnje energije u proizvodnji ratarskih kultura i skrenuta je pažnja na mineralna đubriva. Potrošnja energije je praćena u proizvodnji pšenice, kukuruza, semenskog suncokreta, šećerne repe i soje, tokom tri proizvodne sezone. Data je analiza potrošnje energije kroz sve postupke manipulacije mineralnim đubrivima do i od imanja pa do same aplikacije na parceli. Analizirana je zavisnost ukupnih energetskih inputa i prinosa i korelacija utroška mineralnog đubriva i outputa. Rezultati istraživanja pokazuju da mineralna đubriva, u energeskom bilansu ratarske proizvodnje, učestvuju sa 40,52% (semenski suncokret) pa do 55,19% (kukuruz). Najintenzivniji utrošak energije po jedinici površine zabeležen je u proizvodnji šećerne repe, 27848,9 MJ ha-1 dok je najmanje energije utrošeno kod soje, 11371,28 MJ ha-1. Proizvodnja šećerne repe je energetski najproduktivnija (1,58 kg MJ-1). Najviše energije, kod manipulacije i aplikacije đubriva, je utrošeno u proizvodnji pšenice, 14,54 MJ ha-1, a najmanje u proizvodnji soje, 3,23 MJ ha-1. Statistička analiza je pokazala da postoji korelacija između energije utrošene preko đubriva i samog prinosa ratarskih kultura. Funcionalna veza između inputa putem đubriva i prinosa je jaka u svim slučajevima osim kod soje. Regresione jednačine pokazuju pozitivnu zavisnost između prinosa i uložene energije preko đubriva, osim u slučaju pšenice i semenskog kukuruza.",
publisher = "Nacionalno društvo za procesnu tehniku i energetiku u poljoprivredi, Novi Sad",
journal = "Journal on Processing and Energy in Agriculture",
title = "Energy efficiency of the mineral fertilizer application in crop production, Energetska efikasnost aplikacije mineralnih đubriva u proizvodnji ratarskih kultura",
pages = "30-26",
number = "1",
volume = "24",
doi = "10.5937/jpea24-25576"
}

Dimitrijević, A., Gavrilović, M., Mileusnić, Z.,& Miodragović, R.. (2020). Energy efficiency of the mineral fertilizer application in crop production. in Journal on Processing and Energy in Agriculture
Nacionalno društvo za procesnu tehniku i energetiku u poljoprivredi, Novi Sad., 24(1), 26-30.
https://doi.org/10.5937/jpea24-25576

Dimitrijević A, Gavrilović M, Mileusnić Z, Miodragović R. Energy efficiency of the mineral fertilizer application in crop production. in Journal on Processing and Energy in Agriculture. 2020;24(1):26-30.
doi:10.5937/jpea24-25576 .

Dimitrijević, Aleksandra, Gavrilović, Marija, Mileusnić, Zoran, Miodragović, Rajko, "Energy efficiency of the mineral fertilizer application in crop production" in Journal on Processing and Energy in Agriculture, 24, no. 1 (2020):26-30,
https://doi.org/10.5937/jpea24-25576 . .

TY  - JOUR
AU  - Pajić, Miloš
AU  - Oparnica, Stanko
AU  - Oljača, Mićo V.
AU  - Gligorević, Kosta
AU  - Dražić, Milan
AU  - Zlatanović, Ivan
AU  - Bošković, Biljana
PY  - 2019
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5214
AB  - Chemical protection is an indispensable agro-technical step in all segments of conventional agricultural production. The significance of proper chemical protection is large for the quality and yield of cultivated culture, as is the financial costs that this measure has in the structure of total costs. The established technique of control, monitoring the quality of work and the efficiency of plant protection machines in crop production has numerous shortcomings. Different techniques of precision agriculture enable us to record and detect critical points in various production processes, so similar techniques can be applied in the control of chemical protection of barley. In this paper, a location database of actual flows of sprinklers that used chemical treatments in barley was used. On a plot of 52 ha, the deviation from the specified treatment rate by more than 10% was performed at 3.61 ha. It was found that the achieved norm of treatment when using the same aggregate, depends significantly on the operator itself, where the deviations in individual treatments and over 100%. Significant deviations in treatment standards have been identified that also significantly affect the cost of consumed chemicals, where the recommended standards have been exceeded in the chemical protection of barley production on over 454 ha, which increased the cost of used chemicals by 10.33%.
AB  - Hemijska zaštita je nezaobilazna agrotehnička mera u svim segmentima konvencionalne poljoprivredne proizvodnje. Značaj pravilnog izvođenja hemijske zaštite na kvalitet i prinos gajenih useva je veliki, isto kao i finansijski troškovi koja ova mera ima u strukturi ukupnih troškova. Ustaljena tehnika kontrole, praćenje kvaliteta rada i efikasnosti mašina za zaštitu bilja u ratarskoj proizvodnji ima brojne nedostatke. Različite tehnike precizne poljoprivrede NAM omogućavaju evidentiranje i detekciju kritičnih tačaka u različitim proizvodnim procesima, pa se slične tehnike mogu primeniti u kontroli hemijske zaštite ječma. U ovom radu je korišćena lokacijski notirana baza podataka ostvarenih protoka prskalica koje su radila hemijski tretmane u ječmu. Na parceli veličine 52 ha, odstupanje od zadate norme tretiranja, za više od 10%, je obavljeno na 3,61 ha. Utvrđeno je da ostvarena norma tretiranja, prilikom korišćenja istog agregata, u značajnoj meri zavisi od samog rukovaoca, gde su odstupanja u pojedinim tretmanima i preko 100%. Utvrđena su značajna odstupanja u normama tretiranja koja značajno utiču na cenu koštanja utrošenih hemijskih sredstava, gde su u hemijskoj zaštiti ječma na preko 454 ha prekoračene zadate norme, što je povećalo troškove upotrebljenih hemijskih sredstava za 10,33%.
PB  - Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd
T2  - Poljoprivredna tehnika
T1  - Mapping treatments of chemical protection in barley production by using the precision agriculture technology
T1  - Mapiranje tretmana hemijske zaštite u proizvodnji ječma korišćenjem tehnika precizne poljoprivrede
EP  - 55
IS  - 2
SP  - 47
VL  - 44
DO  - 10.5937/PoljTeh1902047P
ER  - 

@article{
author = "Pajić, Miloš and Oparnica, Stanko and Oljača, Mićo V. and Gligorević, Kosta and Dražić, Milan and Zlatanović, Ivan and Bošković, Biljana",
year = "2019",
abstract = "Chemical protection is an indispensable agro-technical step in all segments of conventional agricultural production. The significance of proper chemical protection is large for the quality and yield of cultivated culture, as is the financial costs that this measure has in the structure of total costs. The established technique of control, monitoring the quality of work and the efficiency of plant protection machines in crop production has numerous shortcomings. Different techniques of precision agriculture enable us to record and detect critical points in various production processes, so similar techniques can be applied in the control of chemical protection of barley. In this paper, a location database of actual flows of sprinklers that used chemical treatments in barley was used. On a plot of 52 ha, the deviation from the specified treatment rate by more than 10% was performed at 3.61 ha. It was found that the achieved norm of treatment when using the same aggregate, depends significantly on the operator itself, where the deviations in individual treatments and over 100%. Significant deviations in treatment standards have been identified that also significantly affect the cost of consumed chemicals, where the recommended standards have been exceeded in the chemical protection of barley production on over 454 ha, which increased the cost of used chemicals by 10.33%., Hemijska zaštita je nezaobilazna agrotehnička mera u svim segmentima konvencionalne poljoprivredne proizvodnje. Značaj pravilnog izvođenja hemijske zaštite na kvalitet i prinos gajenih useva je veliki, isto kao i finansijski troškovi koja ova mera ima u strukturi ukupnih troškova. Ustaljena tehnika kontrole, praćenje kvaliteta rada i efikasnosti mašina za zaštitu bilja u ratarskoj proizvodnji ima brojne nedostatke. Različite tehnike precizne poljoprivrede NAM omogućavaju evidentiranje i detekciju kritičnih tačaka u različitim proizvodnim procesima, pa se slične tehnike mogu primeniti u kontroli hemijske zaštite ječma. U ovom radu je korišćena lokacijski notirana baza podataka ostvarenih protoka prskalica koje su radila hemijski tretmane u ječmu. Na parceli veličine 52 ha, odstupanje od zadate norme tretiranja, za više od 10%, je obavljeno na 3,61 ha. Utvrđeno je da ostvarena norma tretiranja, prilikom korišćenja istog agregata, u značajnoj meri zavisi od samog rukovaoca, gde su odstupanja u pojedinim tretmanima i preko 100%. Utvrđena su značajna odstupanja u normama tretiranja koja značajno utiču na cenu koštanja utrošenih hemijskih sredstava, gde su u hemijskoj zaštiti ječma na preko 454 ha prekoračene zadate norme, što je povećalo troškove upotrebljenih hemijskih sredstava za 10,33%.",
publisher = "Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd",
journal = "Poljoprivredna tehnika",
title = "Mapping treatments of chemical protection in barley production by using the precision agriculture technology, Mapiranje tretmana hemijske zaštite u proizvodnji ječma korišćenjem tehnika precizne poljoprivrede",
pages = "55-47",
number = "2",
volume = "44",
doi = "10.5937/PoljTeh1902047P"
}

Pajić, M., Oparnica, S., Oljača, M. V., Gligorević, K., Dražić, M., Zlatanović, I.,& Bošković, B.. (2019). Mapping treatments of chemical protection in barley production by using the precision agriculture technology. in Poljoprivredna tehnika
Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd., 44(2), 47-55.
https://doi.org/10.5937/PoljTeh1902047P

Pajić M, Oparnica S, Oljača MV, Gligorević K, Dražić M, Zlatanović I, Bošković B. Mapping treatments of chemical protection in barley production by using the precision agriculture technology. in Poljoprivredna tehnika. 2019;44(2):47-55.
doi:10.5937/PoljTeh1902047P .

Pajić, Miloš, Oparnica, Stanko, Oljača, Mićo V., Gligorević, Kosta, Dražić, Milan, Zlatanović, Ivan, Bošković, Biljana, "Mapping treatments of chemical protection in barley production by using the precision agriculture technology" in Poljoprivredna tehnika, 44, no. 2 (2019):47-55,
https://doi.org/10.5937/PoljTeh1902047P . .

TY  - JOUR
AU  - Živković, Milovan
AU  - Oljača, Mićo V.
AU  - Komnenić, Vaso
AU  - Gligorević, Kosta
AU  - Dražić, Milan
AU  - Pajić, Miloš
PY  - 2019
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5225
AB  - Basic soil tillage in perennial plantations is still present in agro-ecological conditions of R.Serbia despite the tendency for grassing the inter-row space. The reasons for this include arid climatic conditions, as well as the lack of an irrigation system requiring great investments. Mechanical soil tillage provides some advantages over the procedures of soil grassing. These advantages primarily relate to the rational distribution of moisture in the soil, prevention of the development of harmful rodents, better aeration of soil as well as an effective application of organic fertilizers. The paper presents comparative exploitation surveys in soil tillage with a conventional plough, subsoilers and rotary hoes in perennial plantations. The exploitation testing covered determination of working depth, working speed, pulling resistance, front and rear wheel load, performance and fuel consumption. The results of the survey show that apart of having better tractor static load distribution when it is in aggregate with the rotary hoe, this combination has a potential of lowering the fuel consumption. This aggregate has 17% lower fuel consumption compared to the subsoiler usage and 29% lower consumption compared to the plough usage. The main conclusion is that the performance indicators of the working methods described should be analysed in further research. To-date experience shows that the operation of the rotary hoe compared to the standard plough results in lower intensity of the soli mixing and lower intensity of plant residues incorporation in the soil.
AB  - Osnovna obrada zemljišta u višegodišnjim zasadima i pored tendencija zatravljivanja međurednog prostora još uvek je prisutna u agroekološkim Republike Srbije. Razlog za to su aridni klimatski uslovi kao i nedostatak tehničkih sistema za navodnjavanje za čije korišćenje su potrebne velike investicije. Mehaničkom obradom zemljišta ostvaruju se određene prednosti u odnosu na postupke zatravljivanja. Te prednosti pre svega se odnose na racionalnim raspolaganjem sa vlagom u zemljištu, sprečavanje razvoja štetnih glodara, bolja aeracija zemljišta, kao i efikasno unošenje organskih đubriva. U radu su prikazana uporedna eksploataciona istraživanja pri obradi zemljišta klasičnim plugom, razrivačem i rotacionim ašovom u višegodišnjim zasadima. Ispitivanjima su obuhvaćeni parametri: dubina obrade, vučni otpor, oterećenje prednjih i zadnjih točkova, brzina kretanja, učinak i potrošnja goriva. Rezultati istraživanja u ovom radu pokazuju da pored bolje statičke raspoređenosti opterećenja traktora u radu agregata traktor - rotacioni ašov u odnosu na obradu oranjem i razrivanjem, značajne su i uštede u potrošnji goriva po jedinici površine. Potrošnja goriva kod obrade rotacionim ašovom je manja za oko 17 % u odnosu na podrivanje i do 29 % u odnosu na oranje klasičnim plugom.
PB  - Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd
T2  - Poljoprivredna tehnika
T1  - Basic soil tillage of perennial plantations with a rotary shovel
T1  - Osnovna obrada zemljišta u višegodišnjim zasadima sa rotacionom ašovom
EP  - 43
IS  - 3
SP  - 34
VL  - 44
DO  - 10.5937/PoljTeh1903034Z
ER  - 

@article{
author = "Živković, Milovan and Oljača, Mićo V. and Komnenić, Vaso and Gligorević, Kosta and Dražić, Milan and Pajić, Miloš",
year = "2019",
abstract = "Basic soil tillage in perennial plantations is still present in agro-ecological conditions of R.Serbia despite the tendency for grassing the inter-row space. The reasons for this include arid climatic conditions, as well as the lack of an irrigation system requiring great investments. Mechanical soil tillage provides some advantages over the procedures of soil grassing. These advantages primarily relate to the rational distribution of moisture in the soil, prevention of the development of harmful rodents, better aeration of soil as well as an effective application of organic fertilizers. The paper presents comparative exploitation surveys in soil tillage with a conventional plough, subsoilers and rotary hoes in perennial plantations. The exploitation testing covered determination of working depth, working speed, pulling resistance, front and rear wheel load, performance and fuel consumption. The results of the survey show that apart of having better tractor static load distribution when it is in aggregate with the rotary hoe, this combination has a potential of lowering the fuel consumption. This aggregate has 17% lower fuel consumption compared to the subsoiler usage and 29% lower consumption compared to the plough usage. The main conclusion is that the performance indicators of the working methods described should be analysed in further research. To-date experience shows that the operation of the rotary hoe compared to the standard plough results in lower intensity of the soli mixing and lower intensity of plant residues incorporation in the soil., Osnovna obrada zemljišta u višegodišnjim zasadima i pored tendencija zatravljivanja međurednog prostora još uvek je prisutna u agroekološkim Republike Srbije. Razlog za to su aridni klimatski uslovi kao i nedostatak tehničkih sistema za navodnjavanje za čije korišćenje su potrebne velike investicije. Mehaničkom obradom zemljišta ostvaruju se određene prednosti u odnosu na postupke zatravljivanja. Te prednosti pre svega se odnose na racionalnim raspolaganjem sa vlagom u zemljištu, sprečavanje razvoja štetnih glodara, bolja aeracija zemljišta, kao i efikasno unošenje organskih đubriva. U radu su prikazana uporedna eksploataciona istraživanja pri obradi zemljišta klasičnim plugom, razrivačem i rotacionim ašovom u višegodišnjim zasadima. Ispitivanjima su obuhvaćeni parametri: dubina obrade, vučni otpor, oterećenje prednjih i zadnjih točkova, brzina kretanja, učinak i potrošnja goriva. Rezultati istraživanja u ovom radu pokazuju da pored bolje statičke raspoređenosti opterećenja traktora u radu agregata traktor - rotacioni ašov u odnosu na obradu oranjem i razrivanjem, značajne su i uštede u potrošnji goriva po jedinici površine. Potrošnja goriva kod obrade rotacionim ašovom je manja za oko 17 % u odnosu na podrivanje i do 29 % u odnosu na oranje klasičnim plugom.",
publisher = "Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd",
journal = "Poljoprivredna tehnika",
title = "Basic soil tillage of perennial plantations with a rotary shovel, Osnovna obrada zemljišta u višegodišnjim zasadima sa rotacionom ašovom",
pages = "43-34",
number = "3",
volume = "44",
doi = "10.5937/PoljTeh1903034Z"
}

Živković, M., Oljača, M. V., Komnenić, V., Gligorević, K., Dražić, M.,& Pajić, M.. (2019). Basic soil tillage of perennial plantations with a rotary shovel. in Poljoprivredna tehnika
Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd., 44(3), 34-43.
https://doi.org/10.5937/PoljTeh1903034Z

Živković M, Oljača MV, Komnenić V, Gligorević K, Dražić M, Pajić M. Basic soil tillage of perennial plantations with a rotary shovel. in Poljoprivredna tehnika. 2019;44(3):34-43.
doi:10.5937/PoljTeh1903034Z .

Živković, Milovan, Oljača, Mićo V., Komnenić, Vaso, Gligorević, Kosta, Dražić, Milan, Pajić, Miloš, "Basic soil tillage of perennial plantations with a rotary shovel" in Poljoprivredna tehnika, 44, no. 3 (2019):34-43,
https://doi.org/10.5937/PoljTeh1903034Z . .

TY  - JOUR
AU  - Koprivica, Ranko
AU  - Veljković, Biljana
AU  - Turan, Jan
AU  - Radivojević, Dušan
AU  - Ćurčić, Srećko
AU  - Mileusnić, Zoran
AU  - Balalić, Igor
PY  - 2019
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5146
AB  - Knowing the coefficient of friction of bio material is important in determining the angle of the grain elevator elevator when designing combines, as well as the angles of gravity tables and pipes in seed finishing. The basic characteristic of biological materials, or seeds of agricultural crops, is that they differ in their physical and morphological characteristics. Therefore, the friction depends on: the types of plants, variety, shape, dimensions and seed content, the humidity of the seed, the intensity of the normal force on the substrate and the roughness of the substrate. The paper presents the results of the study of the influence of individual factors (varieties, water content of the grain and the type of substrate) and their interactions on the grain friction coefficient. The domestic varieties that are grown in Serbia are selected for testing the fruiting grain fruity: Banadanka, Jasna and Slavica. The experimental measurement of the static coefficient of grain slip friction was done using the level of the mechanical device Tribometr. Plastic, plywood, galvanized, steel, aluminum and stainless steel sheet are made for the experiment purposes. Research was carried out with different water content in grains: 6%, 11%, 16% and 24%. The variety Banadanka had a lower friction coefficient compared to Jasna and Slavica varieties on all substrates and with all the water content of the grain. It was found that with the increase of water content in the grain, a significant increase in the friction coefficient of the grains of the tested varieties on all substrates was achieved. The highest friction coefficient for all water content of the grains of the tested varieties was on the base of the plywood board, and the smallest on the base of stainless steel sheet.
T2  - 16th International Conference on Tribology
T1  - Coefficient of explosion of grape oil repas in respect of variety, content of humidity and surface
EP  - 525
IS  - 1
SP  - 518
VL  - 1
DO  - 10.24874/PES01.01.068
ER  - 

@article{
author = "Koprivica, Ranko and Veljković, Biljana and Turan, Jan and Radivojević, Dušan and Ćurčić, Srećko and Mileusnić, Zoran and Balalić, Igor",
year = "2019",
abstract = "Knowing the coefficient of friction of bio material is important in determining the angle of the grain elevator elevator when designing combines, as well as the angles of gravity tables and pipes in seed finishing. The basic characteristic of biological materials, or seeds of agricultural crops, is that they differ in their physical and morphological characteristics. Therefore, the friction depends on: the types of plants, variety, shape, dimensions and seed content, the humidity of the seed, the intensity of the normal force on the substrate and the roughness of the substrate. The paper presents the results of the study of the influence of individual factors (varieties, water content of the grain and the type of substrate) and their interactions on the grain friction coefficient. The domestic varieties that are grown in Serbia are selected for testing the fruiting grain fruity: Banadanka, Jasna and Slavica. The experimental measurement of the static coefficient of grain slip friction was done using the level of the mechanical device Tribometr. Plastic, plywood, galvanized, steel, aluminum and stainless steel sheet are made for the experiment purposes. Research was carried out with different water content in grains: 6%, 11%, 16% and 24%. The variety Banadanka had a lower friction coefficient compared to Jasna and Slavica varieties on all substrates and with all the water content of the grain. It was found that with the increase of water content in the grain, a significant increase in the friction coefficient of the grains of the tested varieties on all substrates was achieved. The highest friction coefficient for all water content of the grains of the tested varieties was on the base of the plywood board, and the smallest on the base of stainless steel sheet.",
journal = "16th International Conference on Tribology",
title = "Coefficient of explosion of grape oil repas in respect of variety, content of humidity and surface",
pages = "525-518",
number = "1",
volume = "1",
doi = "10.24874/PES01.01.068"
}

Koprivica, R., Veljković, B., Turan, J., Radivojević, D., Ćurčić, S., Mileusnić, Z.,& Balalić, I.. (2019). Coefficient of explosion of grape oil repas in respect of variety, content of humidity and surface. in 16th International Conference on Tribology, 1(1), 518-525.
https://doi.org/10.24874/PES01.01.068

Koprivica R, Veljković B, Turan J, Radivojević D, Ćurčić S, Mileusnić Z, Balalić I. Coefficient of explosion of grape oil repas in respect of variety, content of humidity and surface. in 16th International Conference on Tribology. 2019;1(1):518-525.
doi:10.24874/PES01.01.068 .

Koprivica, Ranko, Veljković, Biljana, Turan, Jan, Radivojević, Dušan, Ćurčić, Srećko, Mileusnić, Zoran, Balalić, Igor, "Coefficient of explosion of grape oil repas in respect of variety, content of humidity and surface" in 16th International Conference on Tribology, 1, no. 1 (2019):518-525,
https://doi.org/10.24874/PES01.01.068 . .

TY  - JOUR
AU  - Stanisavljević, Rade
AU  - Vuković, Aleksandar
AU  - Sasa, Barac
AU  - Radojević, Rade
AU  - Dokić, Dagoslav
AU  - Petrović, Dragan
PY  - 2019
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5166
AB  - The paper presents the three years efficiency results (2011-2013) of the work and ways of harvesting (three types of mowers, with or without spreading the forage) influencing the quality of the forage (the content of crude protein and crude fiber) during the three days drying process. These results indicate that the harvesting method can strongly affect the work efficiency, energy consumption, the forage drying intensity and the quality of forage used for hay and haylage preparation. The best quality of the forage was achieved when a drum rotating mower POTTINGER CAT 185 was used. Negative correlation was found between content of crude protein and the crude fibre content, depending on the type of mower, varying in the range between r= -0.978 and r= -0.882 (POTTINGER CAT 185 r= -0.882 P  lt = 0.05 to JF STOLL SB 200 r= -0.978 P  lt = 0.001).
PB  - Ankara University
T2  - Tarim Bilimleri Dergisi
T1  - Influence of Harvesting on Quality of Alfalfa Forage used for Haylage and Hay
EP  - 390
IS  - 3
SP  - 384
VL  - 25
UR  - https://hdl.handle.net/21.15107/rcub_agrospace_5166
ER  - 

@article{
author = "Stanisavljević, Rade and Vuković, Aleksandar and Sasa, Barac and Radojević, Rade and Dokić, Dagoslav and Petrović, Dragan",
year = "2019",
abstract = "The paper presents the three years efficiency results (2011-2013) of the work and ways of harvesting (three types of mowers, with or without spreading the forage) influencing the quality of the forage (the content of crude protein and crude fiber) during the three days drying process. These results indicate that the harvesting method can strongly affect the work efficiency, energy consumption, the forage drying intensity and the quality of forage used for hay and haylage preparation. The best quality of the forage was achieved when a drum rotating mower POTTINGER CAT 185 was used. Negative correlation was found between content of crude protein and the crude fibre content, depending on the type of mower, varying in the range between r= -0.978 and r= -0.882 (POTTINGER CAT 185 r= -0.882 P  lt = 0.05 to JF STOLL SB 200 r= -0.978 P  lt = 0.001).",
publisher = "Ankara University",
journal = "Tarim Bilimleri Dergisi",
title = "Influence of Harvesting on Quality of Alfalfa Forage used for Haylage and Hay",
pages = "390-384",
number = "3",
volume = "25",
url = "https://hdl.handle.net/21.15107/rcub_agrospace_5166"
}

Stanisavljević, R., Vuković, A., Sasa, B., Radojević, R., Dokić, D.,& Petrović, D.. (2019). Influence of Harvesting on Quality of Alfalfa Forage used for Haylage and Hay. in Tarim Bilimleri Dergisi
Ankara University., 25(3), 384-390.
https://hdl.handle.net/21.15107/rcub_agrospace_5166

Stanisavljević R, Vuković A, Sasa B, Radojević R, Dokić D, Petrović D. Influence of Harvesting on Quality of Alfalfa Forage used for Haylage and Hay. in Tarim Bilimleri Dergisi. 2019;25(3):384-390.
https://hdl.handle.net/21.15107/rcub_agrospace_5166 .

Stanisavljević, Rade, Vuković, Aleksandar, Sasa, Barac, Radojević, Rade, Dokić, Dagoslav, Petrović, Dragan, "Influence of Harvesting on Quality of Alfalfa Forage used for Haylage and Hay" in Tarim Bilimleri Dergisi, 25, no. 3 (2019):384-390,
https://hdl.handle.net/21.15107/rcub_agrospace_5166 .

TY  - JOUR
AU  - Petrović, Dragan
AU  - Cerović, Vera B.
PY  - 2019
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5178
AB  - The mechanization of a wide variety of production processes and operations in modern primary agricultural production, transport, storage and the accompanying food processing industry can hardly be accomplished without automation. In most cases, production efficiency and environmental sustainability require, among other things, accurate control of the flow of energy within the installations, work machines, devices and mechanisms used. From the point of view of the theory of automatic control and regulation, the elements of the engaged technique: machines, devices and mechanisms represent the objects of control. The controlled routing and optimal delivery of energy to desired management facilities is, as a rule, very rarely uniform, as it must have correctlyaligned timing with the current variable requirements of the production or operation process, which often change quite unpredictably over the time. The required amount of energy can be transferred to consumers in agriculture through the application of appropriate mechanical, electrical, pneumatic or hydraulic systems, as well as with their combinations. All existing kinds of energy transmission systems have certain advantages and disadvantages, with a common requirement for appropriate controls. In the focus of interest of this paper are the graphic symbols of the directional control valves for hydraulic transmission and control, designated as hydraulic directional control valves, or shorter, the hydraulic distributors.
AB  - Mehanizacija mnogobrojnih proizvodnih procesa i operacija u savremenoj primarnoj poljoprivrednoj proizvodnji, transportu, skladištenju i pratećoj prehrambenoj prerađivačkoj industriji teško se može ostvariti bez automatizacije. U najvećem broju slučajeva, proizvodna efikasnost i ekološka održivost zahtevaju, između ostalog, preciznu kontrolu toka energije u okviru primenjenih instalacija, radnih mašina, uređaja i mehanizmima. Sa gledišta teorije automatskog upravljanja, elementi angažovane tehnike, mašine, uređaji i mehanizmi, mogu predstavljati objekte upravljanja. Kontrolisano usmeravanje i optimalno dostavljanje određene količine energije željenim objektima upravljanja po pravilu je veoma retko uniformno, jer mora biti usklađeno sa vremenski nepredvidivim promenama zahteva proizvodnog procesa ili operacije. Potrebna energija može se preneti prema potrošačima u poljoprivredi primenom odgovarajućih mehaničkih, električnih, pneumatskih ili hidrauličkih sistema, kao i njihovim sadejstvom. Svi postojeći tipovi sistema prenosa energije imaju izvesne prednosti i nedostatke, uz zajednicki zahtev za odgovarajućim upravljačkim elementima. U fokusu ovog rada su grafički simboli upravljačkih ventila hidrauličkog prenosa energije (snage) i upravljačkih signala, označeni kao hidraulički razvodni ventili, ili hidraulički razvodnici.
PB  - Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd
T2  - Poljoprivredna tehnika
T1  - Hydraulic symbols - part four: Directional control valves
T1  - Hidraulički simboli - deo IV - razvodni ventili
EP  - 16
IS  - 4
SP  - 1
VL  - 44
DO  - 10.5937/PoljTeh1904001P
ER  - 

@article{
author = "Petrović, Dragan and Cerović, Vera B.",
year = "2019",
abstract = "The mechanization of a wide variety of production processes and operations in modern primary agricultural production, transport, storage and the accompanying food processing industry can hardly be accomplished without automation. In most cases, production efficiency and environmental sustainability require, among other things, accurate control of the flow of energy within the installations, work machines, devices and mechanisms used. From the point of view of the theory of automatic control and regulation, the elements of the engaged technique: machines, devices and mechanisms represent the objects of control. The controlled routing and optimal delivery of energy to desired management facilities is, as a rule, very rarely uniform, as it must have correctlyaligned timing with the current variable requirements of the production or operation process, which often change quite unpredictably over the time. The required amount of energy can be transferred to consumers in agriculture through the application of appropriate mechanical, electrical, pneumatic or hydraulic systems, as well as with their combinations. All existing kinds of energy transmission systems have certain advantages and disadvantages, with a common requirement for appropriate controls. In the focus of interest of this paper are the graphic symbols of the directional control valves for hydraulic transmission and control, designated as hydraulic directional control valves, or shorter, the hydraulic distributors., Mehanizacija mnogobrojnih proizvodnih procesa i operacija u savremenoj primarnoj poljoprivrednoj proizvodnji, transportu, skladištenju i pratećoj prehrambenoj prerađivačkoj industriji teško se može ostvariti bez automatizacije. U najvećem broju slučajeva, proizvodna efikasnost i ekološka održivost zahtevaju, između ostalog, preciznu kontrolu toka energije u okviru primenjenih instalacija, radnih mašina, uređaja i mehanizmima. Sa gledišta teorije automatskog upravljanja, elementi angažovane tehnike, mašine, uređaji i mehanizmi, mogu predstavljati objekte upravljanja. Kontrolisano usmeravanje i optimalno dostavljanje određene količine energije željenim objektima upravljanja po pravilu je veoma retko uniformno, jer mora biti usklađeno sa vremenski nepredvidivim promenama zahteva proizvodnog procesa ili operacije. Potrebna energija može se preneti prema potrošačima u poljoprivredi primenom odgovarajućih mehaničkih, električnih, pneumatskih ili hidrauličkih sistema, kao i njihovim sadejstvom. Svi postojeći tipovi sistema prenosa energije imaju izvesne prednosti i nedostatke, uz zajednicki zahtev za odgovarajućim upravljačkim elementima. U fokusu ovog rada su grafički simboli upravljačkih ventila hidrauličkog prenosa energije (snage) i upravljačkih signala, označeni kao hidraulički razvodni ventili, ili hidraulički razvodnici.",
publisher = "Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd",
journal = "Poljoprivredna tehnika",
title = "Hydraulic symbols - part four: Directional control valves, Hidraulički simboli - deo IV - razvodni ventili",
pages = "16-1",
number = "4",
volume = "44",
doi = "10.5937/PoljTeh1904001P"
}

Petrović, D.,& Cerović, V. B.. (2019). Hydraulic symbols - part four: Directional control valves. in Poljoprivredna tehnika
Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd., 44(4), 1-16.
https://doi.org/10.5937/PoljTeh1904001P

Petrović D, Cerović VB. Hydraulic symbols - part four: Directional control valves. in Poljoprivredna tehnika. 2019;44(4):1-16.
doi:10.5937/PoljTeh1904001P .

Petrović, Dragan, Cerović, Vera B., "Hydraulic symbols - part four: Directional control valves" in Poljoprivredna tehnika, 44, no. 4 (2019):1-16,
https://doi.org/10.5937/PoljTeh1904001P . .

TY  - JOUR
AU  - Petrović, Dragan
AU  - Cerović, Vera B.
PY  - 2019
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5202
AB  - Similar to human health, the importance of hydraulics sometimes becomes apparent only in her absence. Images and motives of agricultural workers from the past times and centuries can look attractive only on paintings of arts. In reality, it was a very hard and sometimes quite dangerous job. The introduction of hydraulics in construction of modern farming machines, agriculture is less demanding for all farm workers, but also more efficient, which is of particular importance for providing enough food for the growing world during the 20-th century. Achieving high efficiency, reliability and long service life of these systems requires sophisticated diagnostics and failure repairment, regular maintenance and careful use of each hydraulic system, and this is only possible with a good knowledge of the functional principles of all elements, their connections and the whole system. However, modern hydraulic systems of agricultural machines are often very complicated, and the construction of their components is too complex for detailed graphic representation within the whole corresponding hydraulic installation. Therefore, instead of detailed representation of the components, schematic diagrams are used. This manuscript represents a logical continuation of the first and second parts of the paper, devoted to the general symbols, labels of measuring instruments and indicators (part one), as well as pumps and actuators (part two). The third) part of the paper presents the hydraulic symbols of the system control elements - hydraulic valves. The graphical symbols of these components are defined by ISO standards.
AB  - Slično ljudskom zdravlju, značaj hidraulike ponekad postaje vidljiv samo u njenom odsustvu. Slike i motivi radnika u poljoprivredi iz prošlih vremena i vekova mogu izgledati privlačno samo na umetničkim slikama. U stvarnosti, to je bio veoma naporan i ponekad prilično opasan posao. Uvođenje hidraulike u konstrukcije savremenih poljoprivrednih mašina za poljoprivrednu proizvodnju, učinilo je poljoprivredu fizički manje zahtevnom za radnike, ali i efikasnijom, što je od posebne važnosti za obezbeđenje hrane rastuće svetske populacije tokom XX veka. Postizanje visoke efikasnosti, pouzdanosti i dugog radnog veka ovih sistema zahteva naprednu dijagnostika i otklanjanje kvarova, redovno održavanje i pažljivo korišćenje svakog hidrauličkog sistema, a to je moguće samo uz dobro poznavanje funkcionalnih principa svih elemenata, njihovih veza i sistema u celini. Međutim, savremeni hidraulički sistemi poljoprivrednih mašina često su veoma komplikovani, a konstrukcija njihovih komponenata previše kompeksna za detaljno grafičko predstavljanje u sastavu pripadajuće hidrauličke instalacije. Zato, umesto detaljnog predstavljanja komponenata, koriste se odgovarajući šematski dijagrami. Ovaj tekst predstavlja logičan nastavak prvog i drugog dela rada, posvećenih opštim simbolima, oznakama mernih instrumenata i indikatora (prvi deo), kao i pumpama i izvršnim elementima (drugi deo). Treći deo rada prikazuje hidrauličke simbole elemenata za upravljanje - hidrauličke ventile. Grafičke simboličke oznake upravljačkih komponenata su definisane ISO standardima.
PB  - Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd
T2  - Poljoprivredna tehnika
T1  - Hydraulic symbols: Part three: Valves
T1  - Hidraulički simboli - deo III - ventili
EP  - 16
IS  - 3
SP  - 1
VL  - 44
DO  - 10.5937/PoljTeh1903001P
ER  - 

@article{
author = "Petrović, Dragan and Cerović, Vera B.",
year = "2019",
abstract = "Similar to human health, the importance of hydraulics sometimes becomes apparent only in her absence. Images and motives of agricultural workers from the past times and centuries can look attractive only on paintings of arts. In reality, it was a very hard and sometimes quite dangerous job. The introduction of hydraulics in construction of modern farming machines, agriculture is less demanding for all farm workers, but also more efficient, which is of particular importance for providing enough food for the growing world during the 20-th century. Achieving high efficiency, reliability and long service life of these systems requires sophisticated diagnostics and failure repairment, regular maintenance and careful use of each hydraulic system, and this is only possible with a good knowledge of the functional principles of all elements, their connections and the whole system. However, modern hydraulic systems of agricultural machines are often very complicated, and the construction of their components is too complex for detailed graphic representation within the whole corresponding hydraulic installation. Therefore, instead of detailed representation of the components, schematic diagrams are used. This manuscript represents a logical continuation of the first and second parts of the paper, devoted to the general symbols, labels of measuring instruments and indicators (part one), as well as pumps and actuators (part two). The third) part of the paper presents the hydraulic symbols of the system control elements - hydraulic valves. The graphical symbols of these components are defined by ISO standards., Slično ljudskom zdravlju, značaj hidraulike ponekad postaje vidljiv samo u njenom odsustvu. Slike i motivi radnika u poljoprivredi iz prošlih vremena i vekova mogu izgledati privlačno samo na umetničkim slikama. U stvarnosti, to je bio veoma naporan i ponekad prilično opasan posao. Uvođenje hidraulike u konstrukcije savremenih poljoprivrednih mašina za poljoprivrednu proizvodnju, učinilo je poljoprivredu fizički manje zahtevnom za radnike, ali i efikasnijom, što je od posebne važnosti za obezbeđenje hrane rastuće svetske populacije tokom XX veka. Postizanje visoke efikasnosti, pouzdanosti i dugog radnog veka ovih sistema zahteva naprednu dijagnostika i otklanjanje kvarova, redovno održavanje i pažljivo korišćenje svakog hidrauličkog sistema, a to je moguće samo uz dobro poznavanje funkcionalnih principa svih elemenata, njihovih veza i sistema u celini. Međutim, savremeni hidraulički sistemi poljoprivrednih mašina često su veoma komplikovani, a konstrukcija njihovih komponenata previše kompeksna za detaljno grafičko predstavljanje u sastavu pripadajuće hidrauličke instalacije. Zato, umesto detaljnog predstavljanja komponenata, koriste se odgovarajući šematski dijagrami. Ovaj tekst predstavlja logičan nastavak prvog i drugog dela rada, posvećenih opštim simbolima, oznakama mernih instrumenata i indikatora (prvi deo), kao i pumpama i izvršnim elementima (drugi deo). Treći deo rada prikazuje hidrauličke simbole elemenata za upravljanje - hidrauličke ventile. Grafičke simboličke oznake upravljačkih komponenata su definisane ISO standardima.",
publisher = "Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd",
journal = "Poljoprivredna tehnika",
title = "Hydraulic symbols: Part three: Valves, Hidraulički simboli - deo III - ventili",
pages = "16-1",
number = "3",
volume = "44",
doi = "10.5937/PoljTeh1903001P"
}

Petrović, D.,& Cerović, V. B.. (2019). Hydraulic symbols: Part three: Valves. in Poljoprivredna tehnika
Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd., 44(3), 1-16.
https://doi.org/10.5937/PoljTeh1903001P

Petrović D, Cerović VB. Hydraulic symbols: Part three: Valves. in Poljoprivredna tehnika. 2019;44(3):1-16.
doi:10.5937/PoljTeh1903001P .

Petrović, Dragan, Cerović, Vera B., "Hydraulic symbols: Part three: Valves" in Poljoprivredna tehnika, 44, no. 3 (2019):1-16,
https://doi.org/10.5937/PoljTeh1903001P . .

TY  - JOUR
AU  - Petrović, Dragan
AU  - Cerović, Vera B.
PY  - 2019
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5216
AB  - Hydraulic power transfer and management systems are widely used in modern agriculture, especially in agricultural engineering and the associated processing industry. They can be very simple, but also extremely complex, when precise matching of the interaction of their components in real time is very difficult to controll and achieve. In addition, the designs of a number of hydraulic components is sufficiently complicated for detailed representation on the corresponding hydraulic installation. In all cases, analyzing the performance characteristics of components and the entire hydraulic system, as well as understanding the structure of the hydraulic system, is of great importance. One of the generally accepted ways to facilitate and speed up these processes is the application of schematic diagrams of hydraulic systems and their subcircuits. Officially, hydraulic symbols are defined by ISO industry standards. Therefore, ideally, all hydraulic schemes should be configured using universal graphic symbols. Unfortunately, this is not always the case in technical practice. Depending on the manufacturer and/or dealer of the hydraulic equipment, the symbols of the associated schemes vary in a smaller or a greater extent. The real reasons for the existence of these differences can only be assumed. According to some authors, companies want their drawings to differ from the hydraulic schema of competitors. Therefore, the most commonly used hydraulic symbols are presented in this paper.
AB  - Hidraulički sistemi prenosa snage i upravljanja široko su zastupljeni u savremenoj poljoprivredi, a posebno u poljoprivrednoj tehnici i pratećoj prerađivačkoj industriji. Mogu biti veoma jednostavni, ali i izuzetno složeni, kada je precizno usklađivanje međusobnih interakcija njihovih komponenata u realnom vremenu veoma otežano. Pored toga, konstrukcija velikog broja hidrauličkih komponenata je dovoljno komplikovana za detaljno predstavljanje u sklopu pripadajuće hidrauličke instalacije. U svim slučajevima, analizanje radnih karakteristika komponenata i celokupnog hidrauličkog sistema, kao i razumevanje strukture hidrauličkog sistema, od neprocenjivog je značaja. Jedan od opšte prihvaćenih načina za olakšavanje i ubrzavanje ovih procesa je izrada i korišćenje šematskih dijagrama hidrauličkih sistema, kao i strujnih kola (podsistema) od kojih su sastavljeni. Zvanično, simboli hidraulike definisani su ISO industrijskim standardima. Stoga, u idealnom slučaju, sve hidrauličke šeme bi trebale sadržati univerzalne simboličke oznake. To ipak nije uvek slučaj u tehničkoj praksi. U zavisnosti od proizvođača i/ili prodavca hidrauličke opreme, simboli pripadajućih šema se nekada mogu razlikovati u izvesnoj meri. Stvarne razloge postojanja ovih razlika je moguće samo pretpostaviti. Prema nekim autorima, proizvođači i/ili prodavci žele da se njihovi crteži razlikuju od hidrauličkih šema konkurenata. Prema drugima, simboli su dizajnirani da predstave većinu raspoloživih komponenata, ali ipak ne mogu pokriti sve postojeće te se zato formiraju dodatni nestandardni simboli u nekim posebnim situacijama. Zato se neki elementi hidrauličkih instalacija moraju predstavljati kao kombinacije različitih postojećih simbola da bi se pokazalo kao funkcionišu. U ovom radu zato su dominantno prikazani standardni hidraulički simboli, a u ređim slučajevima i neki simboli hidrauličkih komponenata koji se i dalje relativno često sreću na hidrauličkim šemama u praksi.
PB  - Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd
T2  - Poljoprivredna tehnika
T1  - Hydraulic symbols: Part one: General symbols and symbols of measuring instruments and indicators
T1  - Hidraulički simboli - deo I - opšti simboli i oznake mernih instrumenata i indikatora
EP  - 56
IS  - 1
SP  - 45
VL  - 44
DO  - 10.5937/PoljTeh1901045P
ER  - 

@article{
author = "Petrović, Dragan and Cerović, Vera B.",
year = "2019",
abstract = "Hydraulic power transfer and management systems are widely used in modern agriculture, especially in agricultural engineering and the associated processing industry. They can be very simple, but also extremely complex, when precise matching of the interaction of their components in real time is very difficult to controll and achieve. In addition, the designs of a number of hydraulic components is sufficiently complicated for detailed representation on the corresponding hydraulic installation. In all cases, analyzing the performance characteristics of components and the entire hydraulic system, as well as understanding the structure of the hydraulic system, is of great importance. One of the generally accepted ways to facilitate and speed up these processes is the application of schematic diagrams of hydraulic systems and their subcircuits. Officially, hydraulic symbols are defined by ISO industry standards. Therefore, ideally, all hydraulic schemes should be configured using universal graphic symbols. Unfortunately, this is not always the case in technical practice. Depending on the manufacturer and/or dealer of the hydraulic equipment, the symbols of the associated schemes vary in a smaller or a greater extent. The real reasons for the existence of these differences can only be assumed. According to some authors, companies want their drawings to differ from the hydraulic schema of competitors. Therefore, the most commonly used hydraulic symbols are presented in this paper., Hidraulički sistemi prenosa snage i upravljanja široko su zastupljeni u savremenoj poljoprivredi, a posebno u poljoprivrednoj tehnici i pratećoj prerađivačkoj industriji. Mogu biti veoma jednostavni, ali i izuzetno složeni, kada je precizno usklađivanje međusobnih interakcija njihovih komponenata u realnom vremenu veoma otežano. Pored toga, konstrukcija velikog broja hidrauličkih komponenata je dovoljno komplikovana za detaljno predstavljanje u sklopu pripadajuće hidrauličke instalacije. U svim slučajevima, analizanje radnih karakteristika komponenata i celokupnog hidrauličkog sistema, kao i razumevanje strukture hidrauličkog sistema, od neprocenjivog je značaja. Jedan od opšte prihvaćenih načina za olakšavanje i ubrzavanje ovih procesa je izrada i korišćenje šematskih dijagrama hidrauličkih sistema, kao i strujnih kola (podsistema) od kojih su sastavljeni. Zvanično, simboli hidraulike definisani su ISO industrijskim standardima. Stoga, u idealnom slučaju, sve hidrauličke šeme bi trebale sadržati univerzalne simboličke oznake. To ipak nije uvek slučaj u tehničkoj praksi. U zavisnosti od proizvođača i/ili prodavca hidrauličke opreme, simboli pripadajućih šema se nekada mogu razlikovati u izvesnoj meri. Stvarne razloge postojanja ovih razlika je moguće samo pretpostaviti. Prema nekim autorima, proizvođači i/ili prodavci žele da se njihovi crteži razlikuju od hidrauličkih šema konkurenata. Prema drugima, simboli su dizajnirani da predstave većinu raspoloživih komponenata, ali ipak ne mogu pokriti sve postojeće te se zato formiraju dodatni nestandardni simboli u nekim posebnim situacijama. Zato se neki elementi hidrauličkih instalacija moraju predstavljati kao kombinacije različitih postojećih simbola da bi se pokazalo kao funkcionišu. U ovom radu zato su dominantno prikazani standardni hidraulički simboli, a u ređim slučajevima i neki simboli hidrauličkih komponenata koji se i dalje relativno često sreću na hidrauličkim šemama u praksi.",
publisher = "Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd",
journal = "Poljoprivredna tehnika",
title = "Hydraulic symbols: Part one: General symbols and symbols of measuring instruments and indicators, Hidraulički simboli - deo I - opšti simboli i oznake mernih instrumenata i indikatora",
pages = "56-45",
number = "1",
volume = "44",
doi = "10.5937/PoljTeh1901045P"
}

Petrović, D.,& Cerović, V. B.. (2019). Hydraulic symbols: Part one: General symbols and symbols of measuring instruments and indicators. in Poljoprivredna tehnika
Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd., 44(1), 45-56.
https://doi.org/10.5937/PoljTeh1901045P

Petrović D, Cerović VB. Hydraulic symbols: Part one: General symbols and symbols of measuring instruments and indicators. in Poljoprivredna tehnika. 2019;44(1):45-56.
doi:10.5937/PoljTeh1901045P .

Petrović, Dragan, Cerović, Vera B., "Hydraulic symbols: Part one: General symbols and symbols of measuring instruments and indicators" in Poljoprivredna tehnika, 44, no. 1 (2019):45-56,
https://doi.org/10.5937/PoljTeh1901045P . .

TY  - JOUR
AU  - Petrović, Dragan
AU  - Cerović, Vera B.
PY  - 2019
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5219
AB  - At the current level of technological development, it is widely accepted that survival and progress of modern agricultural technology (among other things) is based on the widespread application of electronically controlled hydraulic systems, supported by mechanical elements of power transmission and control. This paper is a logical continuation of the first part, entitled "Hydraulic symbols - part I: general symbols and designations of measuring instruments and indicators". Therefore, the current second part of the paper is devoted to the presentation and description of hydraulic symbols of pumps and various types of actuators: linear, rotary and oscillatory. Symbols of the combined-function devices, which can optionally function in two different operating modes, such as pumps or motors, are also shown. Standard symbols of all groups of hydraulic components, which are in the focus of this paper, are standardized and defined by ISO industry standards.
AB  - Na sadašnjem nivou tehnološkog razvoja, opšte je prihvaćeno mišljenje da savremena poljoprivredna tehnika, između ostalog, svoj napredak zasniva na širokoj primeni elektronski kontrolisanih hidrauličkih sistema, podržanih mehaničkim elementima prenosa snage i upravljanja. Ovaj rukopis predstavlja logičan nastavak prvog dela rada, pod nazivom "Hidraulički simboli - deo I: opšti simboli i oznake mernih instrumenata i indikatora", posvećenog pripadajućoj tematici. Zato je drugi deo rada posvećen prikazu i opisu hidrauličkih simbola pumpi i različitih tipova izvršnih hidrauličkih organa i to: linearnih, rotacionih i oscilatornih. Takođe su predstavljeni i simboli uređaja kombinovane namene, koji opciono mogu funkcionisati u dva različita radna režima, kao hidrauličke pumpe ili hidraulički motori. Simboli svih grupa hidrauličkih komponenata, koje su u fokusu ovog rada, standardizovani su i definisani ISO industrijskim standardima.
PB  - Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd
T2  - Poljoprivredna tehnika
T1  - Hydraulic symbols - Part Two: Pumps and actuators
T1  - Hidraulički simboli - deo II - pumpe i izvršni organi
EP  - 12
IS  - 2
SP  - 1
VL  - 44
DO  - 10.5937/PoljTeh1902001P
ER  - 

@article{
author = "Petrović, Dragan and Cerović, Vera B.",
year = "2019",
abstract = "At the current level of technological development, it is widely accepted that survival and progress of modern agricultural technology (among other things) is based on the widespread application of electronically controlled hydraulic systems, supported by mechanical elements of power transmission and control. This paper is a logical continuation of the first part, entitled "Hydraulic symbols - part I: general symbols and designations of measuring instruments and indicators". Therefore, the current second part of the paper is devoted to the presentation and description of hydraulic symbols of pumps and various types of actuators: linear, rotary and oscillatory. Symbols of the combined-function devices, which can optionally function in two different operating modes, such as pumps or motors, are also shown. Standard symbols of all groups of hydraulic components, which are in the focus of this paper, are standardized and defined by ISO industry standards., Na sadašnjem nivou tehnološkog razvoja, opšte je prihvaćeno mišljenje da savremena poljoprivredna tehnika, između ostalog, svoj napredak zasniva na širokoj primeni elektronski kontrolisanih hidrauličkih sistema, podržanih mehaničkim elementima prenosa snage i upravljanja. Ovaj rukopis predstavlja logičan nastavak prvog dela rada, pod nazivom "Hidraulički simboli - deo I: opšti simboli i oznake mernih instrumenata i indikatora", posvećenog pripadajućoj tematici. Zato je drugi deo rada posvećen prikazu i opisu hidrauličkih simbola pumpi i različitih tipova izvršnih hidrauličkih organa i to: linearnih, rotacionih i oscilatornih. Takođe su predstavljeni i simboli uređaja kombinovane namene, koji opciono mogu funkcionisati u dva različita radna režima, kao hidrauličke pumpe ili hidraulički motori. Simboli svih grupa hidrauličkih komponenata, koje su u fokusu ovog rada, standardizovani su i definisani ISO industrijskim standardima.",
publisher = "Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd",
journal = "Poljoprivredna tehnika",
title = "Hydraulic symbols - Part Two: Pumps and actuators, Hidraulički simboli - deo II - pumpe i izvršni organi",
pages = "12-1",
number = "2",
volume = "44",
doi = "10.5937/PoljTeh1902001P"
}

Petrović, D.,& Cerović, V. B.. (2019). Hydraulic symbols - Part Two: Pumps and actuators. in Poljoprivredna tehnika
Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd., 44(2), 1-12.
https://doi.org/10.5937/PoljTeh1902001P

Petrović D, Cerović VB. Hydraulic symbols - Part Two: Pumps and actuators. in Poljoprivredna tehnika. 2019;44(2):1-12.
doi:10.5937/PoljTeh1902001P .

Petrović, Dragan, Cerović, Vera B., "Hydraulic symbols - Part Two: Pumps and actuators" in Poljoprivredna tehnika, 44, no. 2 (2019):1-12,
https://doi.org/10.5937/PoljTeh1902001P . .

TY  - CONF
AU  - Dimitrijević, Aleksandra
AU  - Sica, Carmela
AU  - Miodragović, Rajko
AU  - Mileusnić, Zoran
PY  - 2019
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5095
AB  - In this paper the influence of greenhouse construction type on energy efficiency of tomato and lettuce production was analysed. Influence of greenhouse construction on energy consumption was estimated for four different double plastic covered greenhouses. Specific energy input, energy output-input ratio and energy productivity were estimated in the tomato and lettuce production. Results show that there are differences in energy efficiency regarding the production as well as regarding the type of construction. The average energy input in greenhouse tomato production was 24.13 MJ m(-2) while in lettuce it was 3.19 MJ m(-2). Results also showed that the type of greenhouse construction has a significant influence on the energy efficiency of the greenhouse tomato and lettuce production. Greenhouses with the higher specific volume, in both cases had the higher energy output, higher energy efficiency, higher energy ratios and higher energy productivity.
PB  - Agronomski fakultet Sveucilista u Zagrebu, 10000 Zagreb
C3  - Aktualni Zadaci Mehanizacije Poljoprivrede: Zbornik Radova: Actual Tasks on Agricultural Engineering
T1  - Energy efficiency of the tomato and lettuce greenhouse production systems
EP  - 295
SP  - 287
VL  - 47
UR  - https://hdl.handle.net/21.15107/rcub_agrospace_5095
ER  - 

@conference{
author = "Dimitrijević, Aleksandra and Sica, Carmela and Miodragović, Rajko and Mileusnić, Zoran",
year = "2019",
abstract = "In this paper the influence of greenhouse construction type on energy efficiency of tomato and lettuce production was analysed. Influence of greenhouse construction on energy consumption was estimated for four different double plastic covered greenhouses. Specific energy input, energy output-input ratio and energy productivity were estimated in the tomato and lettuce production. Results show that there are differences in energy efficiency regarding the production as well as regarding the type of construction. The average energy input in greenhouse tomato production was 24.13 MJ m(-2) while in lettuce it was 3.19 MJ m(-2). Results also showed that the type of greenhouse construction has a significant influence on the energy efficiency of the greenhouse tomato and lettuce production. Greenhouses with the higher specific volume, in both cases had the higher energy output, higher energy efficiency, higher energy ratios and higher energy productivity.",
publisher = "Agronomski fakultet Sveucilista u Zagrebu, 10000 Zagreb",
journal = "Aktualni Zadaci Mehanizacije Poljoprivrede: Zbornik Radova: Actual Tasks on Agricultural Engineering",
title = "Energy efficiency of the tomato and lettuce greenhouse production systems",
pages = "295-287",
volume = "47",
url = "https://hdl.handle.net/21.15107/rcub_agrospace_5095"
}

Dimitrijević, A., Sica, C., Miodragović, R.,& Mileusnić, Z.. (2019). Energy efficiency of the tomato and lettuce greenhouse production systems. in Aktualni Zadaci Mehanizacije Poljoprivrede: Zbornik Radova: Actual Tasks on Agricultural Engineering
Agronomski fakultet Sveucilista u Zagrebu, 10000 Zagreb., 47, 287-295.
https://hdl.handle.net/21.15107/rcub_agrospace_5095

Dimitrijević A, Sica C, Miodragović R, Mileusnić Z. Energy efficiency of the tomato and lettuce greenhouse production systems. in Aktualni Zadaci Mehanizacije Poljoprivrede: Zbornik Radova: Actual Tasks on Agricultural Engineering. 2019;47:287-295.
https://hdl.handle.net/21.15107/rcub_agrospace_5095 .

Dimitrijević, Aleksandra, Sica, Carmela, Miodragović, Rajko, Mileusnić, Zoran, "Energy efficiency of the tomato and lettuce greenhouse production systems" in Aktualni Zadaci Mehanizacije Poljoprivrede: Zbornik Radova: Actual Tasks on Agricultural Engineering, 47 (2019):287-295,
https://hdl.handle.net/21.15107/rcub_agrospace_5095 .

TY  - JOUR
AU  - Mileusnić, Zoran
AU  - Tanasliević, Milos
AU  - Miodragović, Rajko
AU  - Dimitrijević, Aleksandra
AU  - Urošević, Mirko
PY  - 2019
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5131
AB  - In this paper, two different approaches in analyzing the tractor lifetime assessment are presented. The first one is based on reliability theory and the other one is based on the relevant experience that was implemented in the ASABE standards. In this way, the dependence of tractor reliability and lifetime on working conditions is presented through two models verified in the paper. Tractors from two different producers were analyzed. Experimental data were collected during the tractor working engagement at the fields of Agricultural Corporation Belgrade (ACB). Analyzing the obtained data it is possible to find the mismanagement in the tractor usage. Removing them it is possible to extend the period of tractor utilization. In this way the overall organization of tractor- machinery system on a farm can significantly be improved.
PB  - Ankara University
T2  - Tarim Bilimleri Dergisi
T1  - Tractor Lifetime Assessment Analysis
EP  - 204
IS  - 2
SP  - 197
VL  - 25
DO  - 10.15832/ankutbd.403823
ER  - 

@article{
author = "Mileusnić, Zoran and Tanasliević, Milos and Miodragović, Rajko and Dimitrijević, Aleksandra and Urošević, Mirko",
year = "2019",
abstract = "In this paper, two different approaches in analyzing the tractor lifetime assessment are presented. The first one is based on reliability theory and the other one is based on the relevant experience that was implemented in the ASABE standards. In this way, the dependence of tractor reliability and lifetime on working conditions is presented through two models verified in the paper. Tractors from two different producers were analyzed. Experimental data were collected during the tractor working engagement at the fields of Agricultural Corporation Belgrade (ACB). Analyzing the obtained data it is possible to find the mismanagement in the tractor usage. Removing them it is possible to extend the period of tractor utilization. In this way the overall organization of tractor- machinery system on a farm can significantly be improved.",
publisher = "Ankara University",
journal = "Tarim Bilimleri Dergisi",
title = "Tractor Lifetime Assessment Analysis",
pages = "204-197",
number = "2",
volume = "25",
doi = "10.15832/ankutbd.403823"
}

Mileusnić, Z., Tanasliević, M., Miodragović, R., Dimitrijević, A.,& Urošević, M.. (2019). Tractor Lifetime Assessment Analysis. in Tarim Bilimleri Dergisi
Ankara University., 25(2), 197-204.
https://doi.org/10.15832/ankutbd.403823

Mileusnić Z, Tanasliević M, Miodragović R, Dimitrijević A, Urošević M. Tractor Lifetime Assessment Analysis. in Tarim Bilimleri Dergisi. 2019;25(2):197-204.
doi:10.15832/ankutbd.403823 .

Mileusnić, Zoran, Tanasliević, Milos, Miodragović, Rajko, Dimitrijević, Aleksandra, Urošević, Mirko, "Tractor Lifetime Assessment Analysis" in Tarim Bilimleri Dergisi, 25, no. 2 (2019):197-204,
https://doi.org/10.15832/ankutbd.403823 . .

TY  - JOUR
AU  - Oljača, Mićo V.
AU  - Pajić, Miloš
AU  - Gligorević, Kosta
AU  - Dražić, Milan
AU  - Zlatanović, Ivan
AU  - Dimitrijević, Aleksandra
AU  - Miodragović, Rajko
AU  - Mileusnić, Zoran
AU  - Radojević, Rade
AU  - Živković, Milovan
AU  - Petrović, Dragan
AU  - Radivojević, Dušan
AU  - Urošević, Mirko
AU  - Topisirović, Goran
AU  - Radičević, Branko
AU  - Ećim, Olivera
AU  - Balać, Nebojša
PY  - 2018
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4863
AB  - The paper analyzes the possibility and the needs for the use of specific types of robots (mini unmanned aircraft with different designs and the designation of UAVs) and the possibility of using in agriculture (agrodrone). The year 2015 was proclaimed (Fortune Magazine, 2016) as the year of increasing and widespread use of UAVs in various areas of human activity, especially in agriculture and forestry (75% of use). This is important for large farm areas, where UAV has many useful functions and a very cost-effective commercial application. Today, the needs for UAVs have increased sharply with various opportunities for both civilian and military needs. There is also a significant interest in the development of new drones that can autonomously fly in different environments and locations and can perform various missions and tasks. Over the past decade, a wide range of applications for drones has gained the significance that led to the discovery of various types of unmanned UAVs of different sizes and weights. In this review, the classification of UAVs ranging based on a detailed overview of the development of the drone industry in recent years, this paper demonstrates the evolution of drones and differents application technologies. Of course, this development is very advanced and revolutionary, as well as the development of mobile and smart phones and the Internet, which will open the way for many users to participate in defining the future of UAV implementation. LIVONA Company, Belgrade, Serbia (and Institute of Agricultural Engineering, Faculty of Agriculture in Belgrade, in tehnical cooperation) has a study and plans on the implementation of the model micro drone EBee SQ Livona RTK in the future general plans for inspection of protection Soils of territory Minicipality of Stara Pazova (351 km2), and agricultural company Napredak, and exspecially plans for soils of agriculture of R. Serbia. VEKOM GeoCompany from Belgrade, (in cooperation with Institute of Agricultural Engineering, Faculty of Agriculture in Belgrade), has a study and plans on the implementation of the model of the drone Aibot KX6 model, in the future of application of agricultural soils of region Open pit Kolubara for area from app. 600 km2 and the other soils of Region). Institute of Agricultural Engineering, Faculty of Agriculture in Belgrade, in cooperation with Municipality of Ub, has a study and plans on the implementation of the model micro drone Hubsan H109S X4 PRO in the future plans general inspection of protection Soils and Waters of territory of Municipality Ub (456 km2).
AB  - U radu su analizirane mogućnosti i potrebe upotrebe specifičnih vrsta robota (mini bespilotnih letelica sa različitim dizajnom, o značane kao UAV) i način korištenja u poljoprivredi (agrodron). Časopis Fortune je 2015.godinu proglasio kao godinu sve većeg i široko rasprostranjene upotrbe UAV letelica, u različitim oblastima ljudske delatnosti, posebno u poljoprivredi i šumarstvu (75% upotrebe). Ovo je naročito važno za velike farme i oblasti pod šumama, gde UAV ima mnogo korisnih funkcija i veoma isplative komercijalne aplikacije. Danas, potrebe za UAV imaju nagli porast sa različitim mogućnostima kako za civilne tako i za vojne potrebe. Takođe postoji značajan interes za razvoj novih bespilotnih letelica koji mogu autonomno leteti u različitim okruženjima i lokacijama i obaviti različite misije i zadatke. Tokom protekle decenije XXI veka, širok spektar aplikacija za bespilotne letelice je dobio značaj koji je doveo do konstrukcija različitih tipova bespilotnih UAV, različitih veličina i težina i svakako namene. Naravno , tehnološki razvoj kod dron sistema je veoma tehničko -tehnološki napredan i revolucionaran, uz razvoj mobilnih i pametnih (android) telefona i interneta, brzo otvora puteve i mogućnosti za mnoge korisnike u definisanju nove budućnosti implementacije UAV različitim oblastima primene. Kompanija Livona d.o.o., Beograd i Institut za poljoprivrednu tehniku, Poljoprivredni fakultet u Beogradu, u tehničkoj saradnji imaju planove o implementaciji modela mikro drona EBee SK Livona RTK u narednim generalnim planovima za inspekciju, zaštitu i korišćenje poljoprivrednih zemljišta Republike Srbije, i posebno teritorije Opštine Stara Pazova (351 km2), gde je posebno mesto poljoprivrednog preduzeća Napredak a.d. VekomGeo d.o.o, Beograd u saradnji sa Institutom za poljoprivrednu tehniku Poljoprivrednog fakulteta u Beogradu ima planove o budućoj upotrebi drona model Aibot X6, za nadzor na površinama od 600 km2 (i poljoprivredna zemljišta) otvorenog kopa R.B. Kolubara ili drugih objekata. Institut za poljoprivrednu tehniku, Poljoprivredni fakultet u Beogradu, ima planove o saradnji sa opštino m Ub, zbog upotrebe modela mikro drona Hubsan H109S Ks4 PRO u inspekciji oko zaštite i načina korišćenja zemljišta i vo da na ovoj teritoriji (456 km2).
PB  - Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd
T2  - Poljoprivredna tehnika
T1  - Design, classification, perspectives and possible applications drones in agriculture of Serbia
T1  - Dizajn, klasifikacija, perspektiva i moguća aplikacija dronova u poljoprivredu Srbije
EP  - 56
IS  - 4
SP  - 29
VL  - 43
DO  - 10.5937/PoljTeh1804029O
ER  - 

@article{
author = "Oljača, Mićo V. and Pajić, Miloš and Gligorević, Kosta and Dražić, Milan and Zlatanović, Ivan and Dimitrijević, Aleksandra and Miodragović, Rajko and Mileusnić, Zoran and Radojević, Rade and Živković, Milovan and Petrović, Dragan and Radivojević, Dušan and Urošević, Mirko and Topisirović, Goran and Radičević, Branko and Ećim, Olivera and Balać, Nebojša",
year = "2018",
abstract = "The paper analyzes the possibility and the needs for the use of specific types of robots (mini unmanned aircraft with different designs and the designation of UAVs) and the possibility of using in agriculture (agrodrone). The year 2015 was proclaimed (Fortune Magazine, 2016) as the year of increasing and widespread use of UAVs in various areas of human activity, especially in agriculture and forestry (75% of use). This is important for large farm areas, where UAV has many useful functions and a very cost-effective commercial application. Today, the needs for UAVs have increased sharply with various opportunities for both civilian and military needs. There is also a significant interest in the development of new drones that can autonomously fly in different environments and locations and can perform various missions and tasks. Over the past decade, a wide range of applications for drones has gained the significance that led to the discovery of various types of unmanned UAVs of different sizes and weights. In this review, the classification of UAVs ranging based on a detailed overview of the development of the drone industry in recent years, this paper demonstrates the evolution of drones and differents application technologies. Of course, this development is very advanced and revolutionary, as well as the development of mobile and smart phones and the Internet, which will open the way for many users to participate in defining the future of UAV implementation. LIVONA Company, Belgrade, Serbia (and Institute of Agricultural Engineering, Faculty of Agriculture in Belgrade, in tehnical cooperation) has a study and plans on the implementation of the model micro drone EBee SQ Livona RTK in the future general plans for inspection of protection Soils of territory Minicipality of Stara Pazova (351 km2), and agricultural company Napredak, and exspecially plans for soils of agriculture of R. Serbia. VEKOM GeoCompany from Belgrade, (in cooperation with Institute of Agricultural Engineering, Faculty of Agriculture in Belgrade), has a study and plans on the implementation of the model of the drone Aibot KX6 model, in the future of application of agricultural soils of region Open pit Kolubara for area from app. 600 km2 and the other soils of Region). Institute of Agricultural Engineering, Faculty of Agriculture in Belgrade, in cooperation with Municipality of Ub, has a study and plans on the implementation of the model micro drone Hubsan H109S X4 PRO in the future plans general inspection of protection Soils and Waters of territory of Municipality Ub (456 km2)., U radu su analizirane mogućnosti i potrebe upotrebe specifičnih vrsta robota (mini bespilotnih letelica sa različitim dizajnom, o značane kao UAV) i način korištenja u poljoprivredi (agrodron). Časopis Fortune je 2015.godinu proglasio kao godinu sve većeg i široko rasprostranjene upotrbe UAV letelica, u različitim oblastima ljudske delatnosti, posebno u poljoprivredi i šumarstvu (75% upotrebe). Ovo je naročito važno za velike farme i oblasti pod šumama, gde UAV ima mnogo korisnih funkcija i veoma isplative komercijalne aplikacije. Danas, potrebe za UAV imaju nagli porast sa različitim mogućnostima kako za civilne tako i za vojne potrebe. Takođe postoji značajan interes za razvoj novih bespilotnih letelica koji mogu autonomno leteti u različitim okruženjima i lokacijama i obaviti različite misije i zadatke. Tokom protekle decenije XXI veka, širok spektar aplikacija za bespilotne letelice je dobio značaj koji je doveo do konstrukcija različitih tipova bespilotnih UAV, različitih veličina i težina i svakako namene. Naravno , tehnološki razvoj kod dron sistema je veoma tehničko -tehnološki napredan i revolucionaran, uz razvoj mobilnih i pametnih (android) telefona i interneta, brzo otvora puteve i mogućnosti za mnoge korisnike u definisanju nove budućnosti implementacije UAV različitim oblastima primene. Kompanija Livona d.o.o., Beograd i Institut za poljoprivrednu tehniku, Poljoprivredni fakultet u Beogradu, u tehničkoj saradnji imaju planove o implementaciji modela mikro drona EBee SK Livona RTK u narednim generalnim planovima za inspekciju, zaštitu i korišćenje poljoprivrednih zemljišta Republike Srbije, i posebno teritorije Opštine Stara Pazova (351 km2), gde je posebno mesto poljoprivrednog preduzeća Napredak a.d. VekomGeo d.o.o, Beograd u saradnji sa Institutom za poljoprivrednu tehniku Poljoprivrednog fakulteta u Beogradu ima planove o budućoj upotrebi drona model Aibot X6, za nadzor na površinama od 600 km2 (i poljoprivredna zemljišta) otvorenog kopa R.B. Kolubara ili drugih objekata. Institut za poljoprivrednu tehniku, Poljoprivredni fakultet u Beogradu, ima planove o saradnji sa opštino m Ub, zbog upotrebe modela mikro drona Hubsan H109S Ks4 PRO u inspekciji oko zaštite i načina korišćenja zemljišta i vo da na ovoj teritoriji (456 km2).",
publisher = "Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd",
journal = "Poljoprivredna tehnika",
title = "Design, classification, perspectives and possible applications drones in agriculture of Serbia, Dizajn, klasifikacija, perspektiva i moguća aplikacija dronova u poljoprivredu Srbije",
pages = "56-29",
number = "4",
volume = "43",
doi = "10.5937/PoljTeh1804029O"
}

Oljača, M. V., Pajić, M., Gligorević, K., Dražić, M., Zlatanović, I., Dimitrijević, A., Miodragović, R., Mileusnić, Z., Radojević, R., Živković, M., Petrović, D., Radivojević, D., Urošević, M., Topisirović, G., Radičević, B., Ećim, O.,& Balać, N.. (2018). Design, classification, perspectives and possible applications drones in agriculture of Serbia. in Poljoprivredna tehnika
Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd., 43(4), 29-56.
https://doi.org/10.5937/PoljTeh1804029O

Oljača MV, Pajić M, Gligorević K, Dražić M, Zlatanović I, Dimitrijević A, Miodragović R, Mileusnić Z, Radojević R, Živković M, Petrović D, Radivojević D, Urošević M, Topisirović G, Radičević B, Ećim O, Balać N. Design, classification, perspectives and possible applications drones in agriculture of Serbia. in Poljoprivredna tehnika. 2018;43(4):29-56.
doi:10.5937/PoljTeh1804029O .

Oljača, Mićo V., Pajić, Miloš, Gligorević, Kosta, Dražić, Milan, Zlatanović, Ivan, Dimitrijević, Aleksandra, Miodragović, Rajko, Mileusnić, Zoran, Radojević, Rade, Živković, Milovan, Petrović, Dragan, Radivojević, Dušan, Urošević, Mirko, Topisirović, Goran, Radičević, Branko, Ećim, Olivera, Balać, Nebojša, "Design, classification, perspectives and possible applications drones in agriculture of Serbia" in Poljoprivredna tehnika, 43, no. 4 (2018):29-56,
https://doi.org/10.5937/PoljTeh1804029O . .

TY  - JOUR
AU  - Balać, Nebojša
AU  - Šunjevarić, Milan V.
AU  - Mileusnić, Zoran
AU  - Miodragović, Rajko
PY  - 2018
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4865
AB  - The paper presents and analyzes the results of the exhaust emission measurement, depending on the tractor operating regime. The goal of this paper was to analyze the influence of the operating regime, that is, two different values of the engine crankshaft rotation speed and two different levels of transmission, to the exhaust emission level. In addition, the paper presents a brief overview of the technical solutions for the subsequent treatment of exhaust gases. The results shown allow comparison of the working regimes of the tested tractor models YTO X1204 and Foton 904. The research also shows how many operators with technical limitations on the tractor, knowledge and techniques of using the machine can contribute to a lower level of exhaust emissions (CO2, NO, NO2, NOX, SO2, O2) of built-in engines in tractors.
AB  - U radu su prikazani i analizirani rezultati merenja izduvne emisije, u zavisnosti od radnog režima traktora. Cilj rada je analiza uticaja radnog režima, odnosno dve različite vrednosti broja obrtaja kolenastog vratila motora traktora i dva različita stepena prenosa, na nivo izduvne emisije. Pored toga rad prikazuje i kratak pregled tehničkih rešenja naknadnog tretmana izduvnih gasova. Prikazani rezultati omogućuju poređenje radnih režima ispitivanih modela traktora 'YTO X1204' i 'Foton 904'. Istraživanje takođe pokazuje koliko rukovaoci - operateri na traktorima uz tehnička ograničenja traktora, znanjem i tehnikom upotrebe mašine mogu doprineti nižem stepenu izduvne emisije gasova (CO2, NO, NO2, NOX, SO2, O2) ugrađenih motora u traktore.
PB  - Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd
T2  - Poljoprivredna tehnika
T1  - The impacts of the tractor working regime on the environment
T1  - Uticaj radnog režima traktora na životnu sredinu
EP  - 37
IS  - 3
SP  - 26
VL  - 43
DO  - 10.5937/PoljTeh1803026B
ER  - 

@article{
author = "Balać, Nebojša and Šunjevarić, Milan V. and Mileusnić, Zoran and Miodragović, Rajko",
year = "2018",
abstract = "The paper presents and analyzes the results of the exhaust emission measurement, depending on the tractor operating regime. The goal of this paper was to analyze the influence of the operating regime, that is, two different values of the engine crankshaft rotation speed and two different levels of transmission, to the exhaust emission level. In addition, the paper presents a brief overview of the technical solutions for the subsequent treatment of exhaust gases. The results shown allow comparison of the working regimes of the tested tractor models YTO X1204 and Foton 904. The research also shows how many operators with technical limitations on the tractor, knowledge and techniques of using the machine can contribute to a lower level of exhaust emissions (CO2, NO, NO2, NOX, SO2, O2) of built-in engines in tractors., U radu su prikazani i analizirani rezultati merenja izduvne emisije, u zavisnosti od radnog režima traktora. Cilj rada je analiza uticaja radnog režima, odnosno dve različite vrednosti broja obrtaja kolenastog vratila motora traktora i dva različita stepena prenosa, na nivo izduvne emisije. Pored toga rad prikazuje i kratak pregled tehničkih rešenja naknadnog tretmana izduvnih gasova. Prikazani rezultati omogućuju poređenje radnih režima ispitivanih modela traktora 'YTO X1204' i 'Foton 904'. Istraživanje takođe pokazuje koliko rukovaoci - operateri na traktorima uz tehnička ograničenja traktora, znanjem i tehnikom upotrebe mašine mogu doprineti nižem stepenu izduvne emisije gasova (CO2, NO, NO2, NOX, SO2, O2) ugrađenih motora u traktore.",
publisher = "Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd",
journal = "Poljoprivredna tehnika",
title = "The impacts of the tractor working regime on the environment, Uticaj radnog režima traktora na životnu sredinu",
pages = "37-26",
number = "3",
volume = "43",
doi = "10.5937/PoljTeh1803026B"
}

Balać, N., Šunjevarić, M. V., Mileusnić, Z.,& Miodragović, R.. (2018). The impacts of the tractor working regime on the environment. in Poljoprivredna tehnika
Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd., 43(3), 26-37.
https://doi.org/10.5937/PoljTeh1803026B

Balać N, Šunjevarić MV, Mileusnić Z, Miodragović R. The impacts of the tractor working regime on the environment. in Poljoprivredna tehnika. 2018;43(3):26-37.
doi:10.5937/PoljTeh1803026B .

Balać, Nebojša, Šunjevarić, Milan V., Mileusnić, Zoran, Miodragović, Rajko, "The impacts of the tractor working regime on the environment" in Poljoprivredna tehnika, 43, no. 3 (2018):26-37,
https://doi.org/10.5937/PoljTeh1803026B . .

TY  - JOUR
AU  - Cerović, Vera B.
AU  - Petrović, Dragan
AU  - Radojević, Rade
AU  - Barać, Saša
AU  - Vuković, Aleksandar
PY  - 2018
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4833
AB  - At present, spreading of mineral fertilizers in Europe is most commonly performed using centrifugal disk spreaders with attached vanes. The motion of an ideal spherical homogeneous fertilizer particle along the straight vane attached to a flat rotating disc was analyzed in this paper. The analysis was performed in the non-inertial reference coordinate system. From the assumptions introduced to enable analytical describing of the real particle motion as well as the general tools of solid mechanics, the ordinary in-homogenous second-order differential equation having constant coefficients arose. Its solution represents an approximation of the real relative motion of the fertilizer particle along the straight radial vane fixed to the flat horizontal disc rotating at a constant angular velocity. However, the solution of this kind can be very useful for the optimization of centrifugal spreader working parameters.
AB  - U Evropi se za rasipanje granularnog mineralnog đubriva najčešće koriste centrifugalni rasipači sa lopaticama. U ovom radu je analizirano kretanje idealne, loptaste, homogene granule đubriva duž lopatica postavljenih po rotirajućem disku. Analiza je izvedena primenom neinercijalnog referentnog koordinatnog sistema. Uvođenjem određenih pretpostavki i primenom zakona teorijske mehanike za opisivanje kretanja čestice, formirana je nehomogena diferencijalna jednačina drugog reda sa konstantnim koeficijentima. Njeno rešenje aproksimira realno relativno kretanje čestice đubriva duž ravnih radijalnih lopatica pričvršćenih za horizontalni disk, koji se obrće konstantnom ugaonom brzinom. Dobijeno rešenje se svakako može koristiti za optimizaciju radnih parametara centrifugalnog rasipača sa diskom.
PB  - Univerzitet u Beogradu - Poljoprivredni fakultet, Beograd
T2  - Journal of Agricultural Sciences (Belgrade)
T1  - On the fertilizer particle motion along the vane of a centrifugal spreader disc assuming pure sliding of the particle
T1  - Kretanje čestice đubriva duž lopatice centrifugalnog rasipača sa diskom pretpostavljajući čisto klizanje čestice
EP  - 97
IS  - 1
SP  - 83
VL  - 63
DO  - 10.2298/JAS1801083C
ER  - 

@article{
author = "Cerović, Vera B. and Petrović, Dragan and Radojević, Rade and Barać, Saša and Vuković, Aleksandar",
year = "2018",
abstract = "At present, spreading of mineral fertilizers in Europe is most commonly performed using centrifugal disk spreaders with attached vanes. The motion of an ideal spherical homogeneous fertilizer particle along the straight vane attached to a flat rotating disc was analyzed in this paper. The analysis was performed in the non-inertial reference coordinate system. From the assumptions introduced to enable analytical describing of the real particle motion as well as the general tools of solid mechanics, the ordinary in-homogenous second-order differential equation having constant coefficients arose. Its solution represents an approximation of the real relative motion of the fertilizer particle along the straight radial vane fixed to the flat horizontal disc rotating at a constant angular velocity. However, the solution of this kind can be very useful for the optimization of centrifugal spreader working parameters., U Evropi se za rasipanje granularnog mineralnog đubriva najčešće koriste centrifugalni rasipači sa lopaticama. U ovom radu je analizirano kretanje idealne, loptaste, homogene granule đubriva duž lopatica postavljenih po rotirajućem disku. Analiza je izvedena primenom neinercijalnog referentnog koordinatnog sistema. Uvođenjem određenih pretpostavki i primenom zakona teorijske mehanike za opisivanje kretanja čestice, formirana je nehomogena diferencijalna jednačina drugog reda sa konstantnim koeficijentima. Njeno rešenje aproksimira realno relativno kretanje čestice đubriva duž ravnih radijalnih lopatica pričvršćenih za horizontalni disk, koji se obrće konstantnom ugaonom brzinom. Dobijeno rešenje se svakako može koristiti za optimizaciju radnih parametara centrifugalnog rasipača sa diskom.",
publisher = "Univerzitet u Beogradu - Poljoprivredni fakultet, Beograd",
journal = "Journal of Agricultural Sciences (Belgrade)",
title = "On the fertilizer particle motion along the vane of a centrifugal spreader disc assuming pure sliding of the particle, Kretanje čestice đubriva duž lopatice centrifugalnog rasipača sa diskom pretpostavljajući čisto klizanje čestice",
pages = "97-83",
number = "1",
volume = "63",
doi = "10.2298/JAS1801083C"
}

Cerović, V. B., Petrović, D., Radojević, R., Barać, S.,& Vuković, A.. (2018). On the fertilizer particle motion along the vane of a centrifugal spreader disc assuming pure sliding of the particle. in Journal of Agricultural Sciences (Belgrade)
Univerzitet u Beogradu - Poljoprivredni fakultet, Beograd., 63(1), 83-97.
https://doi.org/10.2298/JAS1801083C

Cerović VB, Petrović D, Radojević R, Barać S, Vuković A. On the fertilizer particle motion along the vane of a centrifugal spreader disc assuming pure sliding of the particle. in Journal of Agricultural Sciences (Belgrade). 2018;63(1):83-97.
doi:10.2298/JAS1801083C .

Cerović, Vera B., Petrović, Dragan, Radojević, Rade, Barać, Saša, Vuković, Aleksandar, "On the fertilizer particle motion along the vane of a centrifugal spreader disc assuming pure sliding of the particle" in Journal of Agricultural Sciences (Belgrade), 63, no. 1 (2018):83-97,
https://doi.org/10.2298/JAS1801083C . .

TY  - JOUR
AU  - Mileusnić, Zoran
AU  - Radojević, Rade
AU  - Petrović, Dragan
AU  - Cerović, Vera B.
PY  - 2018
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4867
AB  - The analysis of the factors that show decisive influence on the tractors stability and the possible overturning, should preventively indicate the possible improvements of the tractor construction, in order to increase the tractor's and operator's safety. The purpose of this paper is to check the static angles of the longitudinal and lateral tractor stability, using the different methods that check the tractor stability up to the to the turnover limit. The process is based on the tractor longitudinal and lateral tilting and measurement of the reference values of the wheels heights with respect to the base. The same angles can be obtained by various analytical and numerical methods based on the Theoretical mechanics. This paper suggests on the importance of empirical data, because they are the basis for further stability analysis of the tractors, other self-propelled agricultural machines.
AB  - Analiza faktora koji pokazuju odlučujuće uticaje na stabilnost i moguća prevrtanja traktora treba preventivno da ukaže na područja njihove efiksne i sigurne primene, kao i na glavne pravce poboljšanja konstrukcije traktora radi povećanja bezbednosti traktora i rukovaoca. Cilj ovog rada predstavlja provera statičkih uglova podužne i poprečne stabilnosti traktora, primenom različitih pristupa, tako što se isti dovodi do granice prevrtanja. Sam proces se zasniva na podužnom i bočnom podizanju traktora, uz stalno merenje referentnih vrednosti kota oslonih tačaka točkova u odnosu na podlogu. Isti uglovi se mogu proceniti i primenom analitičkih i numeričkih metoda, zasnovanih na principima teorijske mehanike. Rad ukazuje i na značaj empirijskih podataka, jer su oni osnova za sve dalje analize stabilnosti traktora I drugih samohodnih poljoprivrednih mašina.
PB  - Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd
T2  - Poljoprivredna tehnika
T1  - An approach to the wheel tractor static stability analysis
T1  - Pristupi ispitivanju statičke stabilnosti traktora točkaša
EP  - 10
IS  - 2
SP  - 1
VL  - 43
DO  - 10.5937/PoljTeh1802001M
ER  - 

@article{
author = "Mileusnić, Zoran and Radojević, Rade and Petrović, Dragan and Cerović, Vera B.",
year = "2018",
abstract = "The analysis of the factors that show decisive influence on the tractors stability and the possible overturning, should preventively indicate the possible improvements of the tractor construction, in order to increase the tractor's and operator's safety. The purpose of this paper is to check the static angles of the longitudinal and lateral tractor stability, using the different methods that check the tractor stability up to the to the turnover limit. The process is based on the tractor longitudinal and lateral tilting and measurement of the reference values of the wheels heights with respect to the base. The same angles can be obtained by various analytical and numerical methods based on the Theoretical mechanics. This paper suggests on the importance of empirical data, because they are the basis for further stability analysis of the tractors, other self-propelled agricultural machines., Analiza faktora koji pokazuju odlučujuće uticaje na stabilnost i moguća prevrtanja traktora treba preventivno da ukaže na područja njihove efiksne i sigurne primene, kao i na glavne pravce poboljšanja konstrukcije traktora radi povećanja bezbednosti traktora i rukovaoca. Cilj ovog rada predstavlja provera statičkih uglova podužne i poprečne stabilnosti traktora, primenom različitih pristupa, tako što se isti dovodi do granice prevrtanja. Sam proces se zasniva na podužnom i bočnom podizanju traktora, uz stalno merenje referentnih vrednosti kota oslonih tačaka točkova u odnosu na podlogu. Isti uglovi se mogu proceniti i primenom analitičkih i numeričkih metoda, zasnovanih na principima teorijske mehanike. Rad ukazuje i na značaj empirijskih podataka, jer su oni osnova za sve dalje analize stabilnosti traktora I drugih samohodnih poljoprivrednih mašina.",
publisher = "Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd",
journal = "Poljoprivredna tehnika",
title = "An approach to the wheel tractor static stability analysis, Pristupi ispitivanju statičke stabilnosti traktora točkaša",
pages = "10-1",
number = "2",
volume = "43",
doi = "10.5937/PoljTeh1802001M"
}

Mileusnić, Z., Radojević, R., Petrović, D.,& Cerović, V. B.. (2018). An approach to the wheel tractor static stability analysis. in Poljoprivredna tehnika
Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd., 43(2), 1-10.
https://doi.org/10.5937/PoljTeh1802001M

Mileusnić Z, Radojević R, Petrović D, Cerović VB. An approach to the wheel tractor static stability analysis. in Poljoprivredna tehnika. 2018;43(2):1-10.
doi:10.5937/PoljTeh1802001M .

Mileusnić, Zoran, Radojević, Rade, Petrović, Dragan, Cerović, Vera B., "An approach to the wheel tractor static stability analysis" in Poljoprivredna tehnika, 43, no. 2 (2018):1-10,
https://doi.org/10.5937/PoljTeh1802001M . .

TY  - JOUR
AU  - Kurt, Tomantschger
AU  - Petrović, Dragan
AU  - Cerović, Vera B.
AU  - Dimitrijević, Aleksandra
AU  - Radojević, Rade L.
PY  - 2018
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4875
AB  - The paper analyzes the motion of idealized spherical homogeneous fertilizer particle along the straight vane attached to flat rotating disc. The analysis, based on the assumption on the pure rolling of the particle along the vane (without sliding), has been performed in the non-inertial reference coordinate system, which rotates together with the spreader disk. The particle motion along the vane is described by hyperbolic cosine function, which is the solution of the ordinary in-homogenous secondorder differential equation having constant coefficients. Solution of this kind represents an approximation of the real motion of fertilizer particle along the radial vane fixed to horizontal disc rotating at constant angular velocity. However, it can be very useful for optimization of centrifugal spreader design and working parameters, as well as for further analysis of the whole fertilizer spreading process that also includes particle flight.
AB  - U radu je analizirano kretanje idealizovane, loptaste, homogene čestice mineralnog đubriva duž radijalne lopatice postavljene na rotirajućem disku centrifugalnog rasipača đubriva. Analiza, zasnovana na pretpostavci o kotrljanju čestice duž lopatice bez klizanja, izvedena je u neinercijalnom referentnom koordinatnom sistemu koji rotira zajedno sa diskom za rasipanje đubriva. Kretanje čestice duž lopatice je opisano hiperboličnom kosinusnom funkcijom, koja predstavlja rešenje obične homogene diferencijalne jednačine drugog reda sa konstantnim koeficijentima, koja opisuje dinamiku čestice. Rešenje ove vrste predstavlja aproksimaciju stvarnog kretanja čestice đubriva duž lopatice diska koji rotira konstantnom ugaonom brzinom. Međutim, može biti veoma korisno za optimizaciju dizajna centrifugalnog raspršivača i njegovih radnih parametara, kao i za dalju analizu čitavog procesa rasipanja đubriva koji obuhvata i let čestice u vazduhu po napuštanju lopatice.
PB  - Univerzitet u Beogradu - Mašinski fakultet, Beograd
T2  - FME Transactions
T1  - Prediction of a fertilizer particle motion along a vane of a centrifugal spreader disc assuming its pure rolling
T1  - Predviđanje kotrljanja čestice đubriva duž lopatice centrifugalnog rasipača sa diskom
EP  - 551
IS  - 4
SP  - 544
VL  - 46
DO  - 10.5937/fmet1804544K
ER  - 

@article{
author = "Kurt, Tomantschger and Petrović, Dragan and Cerović, Vera B. and Dimitrijević, Aleksandra and Radojević, Rade L.",
year = "2018",
abstract = "The paper analyzes the motion of idealized spherical homogeneous fertilizer particle along the straight vane attached to flat rotating disc. The analysis, based on the assumption on the pure rolling of the particle along the vane (without sliding), has been performed in the non-inertial reference coordinate system, which rotates together with the spreader disk. The particle motion along the vane is described by hyperbolic cosine function, which is the solution of the ordinary in-homogenous secondorder differential equation having constant coefficients. Solution of this kind represents an approximation of the real motion of fertilizer particle along the radial vane fixed to horizontal disc rotating at constant angular velocity. However, it can be very useful for optimization of centrifugal spreader design and working parameters, as well as for further analysis of the whole fertilizer spreading process that also includes particle flight., U radu je analizirano kretanje idealizovane, loptaste, homogene čestice mineralnog đubriva duž radijalne lopatice postavljene na rotirajućem disku centrifugalnog rasipača đubriva. Analiza, zasnovana na pretpostavci o kotrljanju čestice duž lopatice bez klizanja, izvedena je u neinercijalnom referentnom koordinatnom sistemu koji rotira zajedno sa diskom za rasipanje đubriva. Kretanje čestice duž lopatice je opisano hiperboličnom kosinusnom funkcijom, koja predstavlja rešenje obične homogene diferencijalne jednačine drugog reda sa konstantnim koeficijentima, koja opisuje dinamiku čestice. Rešenje ove vrste predstavlja aproksimaciju stvarnog kretanja čestice đubriva duž lopatice diska koji rotira konstantnom ugaonom brzinom. Međutim, može biti veoma korisno za optimizaciju dizajna centrifugalnog raspršivača i njegovih radnih parametara, kao i za dalju analizu čitavog procesa rasipanja đubriva koji obuhvata i let čestice u vazduhu po napuštanju lopatice.",
publisher = "Univerzitet u Beogradu - Mašinski fakultet, Beograd",
journal = "FME Transactions",
title = "Prediction of a fertilizer particle motion along a vane of a centrifugal spreader disc assuming its pure rolling, Predviđanje kotrljanja čestice đubriva duž lopatice centrifugalnog rasipača sa diskom",
pages = "551-544",
number = "4",
volume = "46",
doi = "10.5937/fmet1804544K"
}

Kurt, T., Petrović, D., Cerović, V. B., Dimitrijević, A.,& Radojević, R. L.. (2018). Prediction of a fertilizer particle motion along a vane of a centrifugal spreader disc assuming its pure rolling. in FME Transactions
Univerzitet u Beogradu - Mašinski fakultet, Beograd., 46(4), 544-551.
https://doi.org/10.5937/fmet1804544K

Kurt T, Petrović D, Cerović VB, Dimitrijević A, Radojević RL. Prediction of a fertilizer particle motion along a vane of a centrifugal spreader disc assuming its pure rolling. in FME Transactions. 2018;46(4):544-551.
doi:10.5937/fmet1804544K .

Kurt, Tomantschger, Petrović, Dragan, Cerović, Vera B., Dimitrijević, Aleksandra, Radojević, Rade L., "Prediction of a fertilizer particle motion along a vane of a centrifugal spreader disc assuming its pure rolling" in FME Transactions, 46, no. 4 (2018):544-551,
https://doi.org/10.5937/fmet1804544K . .

TY  - JOUR
AU  - Cerović, Vera B.
AU  - Petrović, Dragan
PY  - 2018
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4866
AB  - Modern agricultural engineering involves the wide application of hydraulic and pneumatic systems for the transmission of power (energy) and control signals. This paper presents the most commonly used types of valves in hydraulic systems. In the literature, more classification of hydraulic valves is reported, according to their construction, purposes, etc., which, even within the same classification criteria, sometimes strongly differ one from the another. Therefore, this presentation is organized by principled valve assignment into four basic groups based on purpose, although there are other divisions according to the purpose of the valve. Other classifications, although present in the available literature, have not been commented in detail, due to space constraints. In this manuscript, the basic elements of the construction of the most important types of valves are described and analyzed, their most important characteristics are described, the base functional principles and technical limitations described, and the given guidelines and recommendations for their optimal application.
AB  - Efikasnu, ekonomičnu i samoodrživu savremenu poljoprivrednu tehniku teško je, pored niza drugih agroekoloških, tehničkih ekonomski i drugih zahteva, zamisliti bez širokog uključivanja manuelnih, mehaničkih, hidrauličkih, pneumatskih, električnih, analognih i digitalnih sistema upravljanja, kao i njihovih usklađenih međusobnih aktivnosti vezanih za prenos snage (energije) i upravljačkih signala. U ovom radu su prikazani najčešće korišćeni tipovi ventila u hidrauličkim sistemima. Literatura prikazuje više klasifikacija ventila, prema konstrukciji, nameni itd., pri čemu se čak i isti tip ventila nekada svrstava u različite grupe. Zato su nekada i ventili svrstani u okviru istog klasifikacionog kriterijuma, mogu međusobno značajno razlikovati. Iz navedenih razloga, ovaj prikaz je organizovan principijelnim svrstavanjem ventila u četiri osnovne grupe, prema osnovnim namenama, mada postoje i drugačije podele prema nameni ventila. Ostale klasifikacije, prisutne u dostupnoj literaturi, samo su preliminarno komentarisane. U ovom radu su opisani i analizirani osnovni elementi konstrukcije najvažnijih tipova ventila, navedene njihove najbitnije tehničko-operativne karakteristike, opisani bazni funkcionalni principi i tehnička ograničenja, te date smernice i preporuke za njihovu optimalnu primenu u poljoprivrednoj tehnici.
PB  - Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd
T2  - Poljoprivredna tehnika
T1  - Control components of hydrostatic and hydraulic systems: The valves
T1  - Ventili kao upravljačke komponente hidrostatičkih sistema
EP  - 25
IS  - 3
SP  - 11
VL  - 43
DO  - 10.5937/PoljTeh1803011C
ER  - 

@article{
author = "Cerović, Vera B. and Petrović, Dragan",
year = "2018",
abstract = "Modern agricultural engineering involves the wide application of hydraulic and pneumatic systems for the transmission of power (energy) and control signals. This paper presents the most commonly used types of valves in hydraulic systems. In the literature, more classification of hydraulic valves is reported, according to their construction, purposes, etc., which, even within the same classification criteria, sometimes strongly differ one from the another. Therefore, this presentation is organized by principled valve assignment into four basic groups based on purpose, although there are other divisions according to the purpose of the valve. Other classifications, although present in the available literature, have not been commented in detail, due to space constraints. In this manuscript, the basic elements of the construction of the most important types of valves are described and analyzed, their most important characteristics are described, the base functional principles and technical limitations described, and the given guidelines and recommendations for their optimal application., Efikasnu, ekonomičnu i samoodrživu savremenu poljoprivrednu tehniku teško je, pored niza drugih agroekoloških, tehničkih ekonomski i drugih zahteva, zamisliti bez širokog uključivanja manuelnih, mehaničkih, hidrauličkih, pneumatskih, električnih, analognih i digitalnih sistema upravljanja, kao i njihovih usklađenih međusobnih aktivnosti vezanih za prenos snage (energije) i upravljačkih signala. U ovom radu su prikazani najčešće korišćeni tipovi ventila u hidrauličkim sistemima. Literatura prikazuje više klasifikacija ventila, prema konstrukciji, nameni itd., pri čemu se čak i isti tip ventila nekada svrstava u različite grupe. Zato su nekada i ventili svrstani u okviru istog klasifikacionog kriterijuma, mogu međusobno značajno razlikovati. Iz navedenih razloga, ovaj prikaz je organizovan principijelnim svrstavanjem ventila u četiri osnovne grupe, prema osnovnim namenama, mada postoje i drugačije podele prema nameni ventila. Ostale klasifikacije, prisutne u dostupnoj literaturi, samo su preliminarno komentarisane. U ovom radu su opisani i analizirani osnovni elementi konstrukcije najvažnijih tipova ventila, navedene njihove najbitnije tehničko-operativne karakteristike, opisani bazni funkcionalni principi i tehnička ograničenja, te date smernice i preporuke za njihovu optimalnu primenu u poljoprivrednoj tehnici.",
publisher = "Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd",
journal = "Poljoprivredna tehnika",
title = "Control components of hydrostatic and hydraulic systems: The valves, Ventili kao upravljačke komponente hidrostatičkih sistema",
pages = "25-11",
number = "3",
volume = "43",
doi = "10.5937/PoljTeh1803011C"
}

Cerović, V. B.,& Petrović, D.. (2018). Control components of hydrostatic and hydraulic systems: The valves. in Poljoprivredna tehnika
Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd., 43(3), 11-25.
https://doi.org/10.5937/PoljTeh1803011C

Cerović VB, Petrović D. Control components of hydrostatic and hydraulic systems: The valves. in Poljoprivredna tehnika. 2018;43(3):11-25.
doi:10.5937/PoljTeh1803011C .

Cerović, Vera B., Petrović, Dragan, "Control components of hydrostatic and hydraulic systems: The valves" in Poljoprivredna tehnika, 43, no. 3 (2018):11-25,
https://doi.org/10.5937/PoljTeh1803011C . .

TY  - JOUR
AU  - Cerović, Vera B.
AU  - Petrović, Dragan
PY  - 2018
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4869
AB  - The paper presents and analyzes the hydrostatic transmission of power and motion. The most important elements of this group of systems and the possibilities of their application in agricultural technology are given. Particular attention is paid to the positive-displacement pumps that have the widest application in agricultural machinery: gear pumps with external and internal gears, vane pumps, piston-axial pumps with inclined swash plate and piston-axial pumps with inclined cylinder block. Two hydrostatic power transmission and control systems are also presented. The first is a very simple mechanical- hydraulic system of automatic leveling of self-propelled berry fruits harvester. In contrast, the other hydrostatic system is very sophisticated. It is implemented as a very complex combination of hydrostatic and mechanical power transmission subsystems, with the accompanying control digital electronic system, and is intended for the wheat harvester propulsion and steering.
AB  - U radu je prikazan i analiziran hidrostatički prenos snage i upravljanja. Navedeni su najvažniji elementi ove grupe sistema i mogućnosti njihove primene u poljoprivrednoj tehnici. Posebno pažnja je posvećena zapreminskim pumpama koje nalaze najširu primenu u poljoprivrednoj mehanizaciji: zupčastim pumpama sa spoljašnjim i unutrašnjim ozubljenjem, krilnim pumpama, klipno-aksijalnim pumpama sa nagnutom kliznom pločom i klipno-aksijalnim pumpama sa nagnutim cilindarskim blokom. Prikazana su dva hidrostatička sistema prenosa snage i upravljanja.Prvi predstavlja veoma jednostavan mehaničko-hidraulički sistem automatske nivelacije samohodnog berača jagodastog voća.Drugi predstavljeni hidrostatički sistem spada u najsavremenije sisteme koji se koriste u poljoprivrednoj mehanizaciji. Izveden je kao veoma složena kombinacija hidrostatičkog i mehaničkog prenosnika snage sa pratećim upravljačkim digitalnim elektronskim sistemom, a namenjen je pogonu žitnog kombajna.
PB  - Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd
T2  - Poljoprivredna tehnika
T1  - Hydrostatic transmission systems of power and motion
T1  - Hidrostatički sistemi prenosa snage poljoprivrednih mašina - zapreminske pumpe
EP  - 21
IS  - 1
SP  - 12
VL  - 43
DO  - 10.5937/PoljTeh1801012C
ER  - 

@article{
author = "Cerović, Vera B. and Petrović, Dragan",
year = "2018",
abstract = "The paper presents and analyzes the hydrostatic transmission of power and motion. The most important elements of this group of systems and the possibilities of their application in agricultural technology are given. Particular attention is paid to the positive-displacement pumps that have the widest application in agricultural machinery: gear pumps with external and internal gears, vane pumps, piston-axial pumps with inclined swash plate and piston-axial pumps with inclined cylinder block. Two hydrostatic power transmission and control systems are also presented. The first is a very simple mechanical- hydraulic system of automatic leveling of self-propelled berry fruits harvester. In contrast, the other hydrostatic system is very sophisticated. It is implemented as a very complex combination of hydrostatic and mechanical power transmission subsystems, with the accompanying control digital electronic system, and is intended for the wheat harvester propulsion and steering., U radu je prikazan i analiziran hidrostatički prenos snage i upravljanja. Navedeni su najvažniji elementi ove grupe sistema i mogućnosti njihove primene u poljoprivrednoj tehnici. Posebno pažnja je posvećena zapreminskim pumpama koje nalaze najširu primenu u poljoprivrednoj mehanizaciji: zupčastim pumpama sa spoljašnjim i unutrašnjim ozubljenjem, krilnim pumpama, klipno-aksijalnim pumpama sa nagnutom kliznom pločom i klipno-aksijalnim pumpama sa nagnutim cilindarskim blokom. Prikazana su dva hidrostatička sistema prenosa snage i upravljanja.Prvi predstavlja veoma jednostavan mehaničko-hidraulički sistem automatske nivelacije samohodnog berača jagodastog voća.Drugi predstavljeni hidrostatički sistem spada u najsavremenije sisteme koji se koriste u poljoprivrednoj mehanizaciji. Izveden je kao veoma složena kombinacija hidrostatičkog i mehaničkog prenosnika snage sa pratećim upravljačkim digitalnim elektronskim sistemom, a namenjen je pogonu žitnog kombajna.",
publisher = "Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd",
journal = "Poljoprivredna tehnika",
title = "Hydrostatic transmission systems of power and motion, Hidrostatički sistemi prenosa snage poljoprivrednih mašina - zapreminske pumpe",
pages = "21-12",
number = "1",
volume = "43",
doi = "10.5937/PoljTeh1801012C"
}

Cerović, V. B.,& Petrović, D.. (2018). Hydrostatic transmission systems of power and motion. in Poljoprivredna tehnika
Univerzitet u Beogradu - Poljoprivredni fakultet - Institut za poljoprivrednu tehniku, Beograd., 43(1), 12-21.
https://doi.org/10.5937/PoljTeh1801012C

Cerović VB, Petrović D. Hydrostatic transmission systems of power and motion. in Poljoprivredna tehnika. 2018;43(1):12-21.
doi:10.5937/PoljTeh1801012C .

Cerović, Vera B., Petrović, Dragan, "Hydrostatic transmission systems of power and motion" in Poljoprivredna tehnika, 43, no. 1 (2018):12-21,
https://doi.org/10.5937/PoljTeh1801012C . .

TY  - JOUR
AU  - Veljković, Biljana
AU  - Koprivica, Ranko
AU  - Radivojević, Dušan
AU  - Mileusnić, Zoran
PY  - 2018
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4657
AB  - Milk production in Serbia is characterized by small surface of production and a large number of small family farms. For rural areas where this production is mostly carried out, economic profitability of production contributes to becoming a family business. This study refers to milk family farms of smaller and medium economic and production capacity, for which the economic analysis in the period of three years was applied and production results were calculated. Applying the calculation method the total revenues and total costs, and contribution margins per cow and per liter of produced milk were computed. By comparing the results obtained on farms A and B, conclusions were drawn, and the sensitivity of contribution margins to change of the given parameters (purchase prices of milk and milk produced per cow) was determined by sensitivity analysis. The stability in production is realized by achieving higher contribution margins with satisfactory milk yield per cow and quality milk, as well acceptable purchase prices of milk.
PB  - Univ Zagreb, Fac Agriculture, Zagreb
T2  - Journal of Central European Agriculture
T1  - Sensitivity of contribution margin in milk production on family farms
EP  - 677
IS  - 3
SP  - 658
VL  - 19
DO  - 10.5513/JCEA01/19.3.2095
ER  - 

@article{
author = "Veljković, Biljana and Koprivica, Ranko and Radivojević, Dušan and Mileusnić, Zoran",
year = "2018",
abstract = "Milk production in Serbia is characterized by small surface of production and a large number of small family farms. For rural areas where this production is mostly carried out, economic profitability of production contributes to becoming a family business. This study refers to milk family farms of smaller and medium economic and production capacity, for which the economic analysis in the period of three years was applied and production results were calculated. Applying the calculation method the total revenues and total costs, and contribution margins per cow and per liter of produced milk were computed. By comparing the results obtained on farms A and B, conclusions were drawn, and the sensitivity of contribution margins to change of the given parameters (purchase prices of milk and milk produced per cow) was determined by sensitivity analysis. The stability in production is realized by achieving higher contribution margins with satisfactory milk yield per cow and quality milk, as well acceptable purchase prices of milk.",
publisher = "Univ Zagreb, Fac Agriculture, Zagreb",
journal = "Journal of Central European Agriculture",
title = "Sensitivity of contribution margin in milk production on family farms",
pages = "677-658",
number = "3",
volume = "19",
doi = "10.5513/JCEA01/19.3.2095"
}

Veljković, B., Koprivica, R., Radivojević, D.,& Mileusnić, Z.. (2018). Sensitivity of contribution margin in milk production on family farms. in Journal of Central European Agriculture
Univ Zagreb, Fac Agriculture, Zagreb., 19(3), 658-677.
https://doi.org/10.5513/JCEA01/19.3.2095

Veljković B, Koprivica R, Radivojević D, Mileusnić Z. Sensitivity of contribution margin in milk production on family farms. in Journal of Central European Agriculture. 2018;19(3):658-677.
doi:10.5513/JCEA01/19.3.2095 .

Veljković, Biljana, Koprivica, Ranko, Radivojević, Dušan, Mileusnić, Zoran, "Sensitivity of contribution margin in milk production on family farms" in Journal of Central European Agriculture, 19, no. 3 (2018):658-677,
https://doi.org/10.5513/JCEA01/19.3.2095 . .