Template-Type: ReDIF-Article 1.0 Author-Name: J. Matej Author-Workplace-Name: Department of Forest and Mobile Technology, Faculty of Environmental and Manufacturing Technology, Technical University in Zvolen, Zvolen, Slovak Republic Title: Tracked mechanism simulation of mobile machine in MSC.ADAMS/View Abstract: Tracked travel mechanism is, in some cases, a significant alternative of wheeled travel mechanism. A suitability of application depends on particular work conditions, which opens the space for computer simulation. This paper is focused on possibilities of tracked vehicle simulation in MSC.ADAMS; mainly in the universal module MSC.ADAMS/View, which is not especially customized for tracked vehicle simulations. The study presents a concrete example of tracked vehicle simulation and a method of its successful realization during travel through terrain obstacle as a basic manoeuvre for evaluating of chassis properties and work ergonomy. Keywords: tracked mechanism, tracked vehicle, MSC.ADAMS/View, dynamics of movement, simulation, chassis, work ergonomy Journal: Research in Agricultural Engineering Pages: 1-7 Volume: 56 Issue: 1 Year: 2010 DOI: 10.17221/9/2009-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/9/2009-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201001-0001.txt Handle: RePEc:caa:jnlrae:v:56:y:2010:i:1:id:9-2009-RAE Template-Type: ReDIF-Article 1.0 Author-Name: J. Kára Author-Workplace-Name: Department of Mechanical Engineering, Faculty of Engineering, Czech University of Life Sciences in Prague, Prague, Czech Republic Author-Name: E. Janča Author-Workplace-Name: Department of Mechanical Engineering, Faculty of Engineering, Czech University of Life Sciences in Prague, Prague, Czech Republic Author-Name: D. Herák Author-Workplace-Name: Department of Mechanical Engineering, Faculty of Engineering, Czech University of Life Sciences in Prague, Prague, Czech Republic Title: Exploitation of anaerobic fermentation of bio-degradable wastes Abstract: The paper deals with assessment of biogas yield from mixtures of Reynoutria substrates and livestock manure. The aim was to perform laboratory experiments and suggest suitable fermenter operating conditions (dry matter content, pH, share of substrate components, thermic regime) for metanogenic digestion, then to determine its quality and assess the usability of such produced biogas. Keywords: biogas, biogas station, renewable energy resources, combined heat and power period Journal: Research in Agricultural Engineering Pages: 8-17 Volume: 56 Issue: 1 Year: 2010 DOI: 10.17221/20/2009-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/20/2009-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201001-0002.txt Handle: RePEc:caa:jnlrae:v:56:y:2010:i:1:id:20-2009-RAE Template-Type: ReDIF-Article 1.0 Author-Name: Z. Tkáč Author-Workplace-Name: Department of Transport and Handling, Faculty of Engineering, Slovak Agriculture University in Nitra, Nitra, Slovak Republic Author-Name: R. Majdan Author-Workplace-Name: Department of Transport and Handling, Faculty of Engineering, Slovak Agriculture University in Nitra, Nitra, Slovak Republic Author-Name: Š. Drabant Author-Workplace-Name: Department of Transport and Handling, Faculty of Engineering, Slovak Agriculture University in Nitra, Nitra, Slovak Republic Author-Name: J. Jablonický Author-Workplace-Name: Department of Transport and Handling, Faculty of Engineering, Slovak Agriculture University in Nitra, Nitra, Slovak Republic Author-Name: R. Abrahám Author-Workplace-Name: Department of Transport and Handling, Faculty of Engineering, Slovak Agriculture University in Nitra, Nitra, Slovak Republic Author-Name: P. Cvíčela Author-Workplace-Name: Department of Transport and Handling, Faculty of Engineering, Slovak Agriculture University in Nitra, Nitra, Slovak Republic Title: The accelerated laboratory test of biodegradable fluid type "ertto" Abstract: The accelerated laboratory tests can evaluate the properties of new biodegradable fluids under relatively short time. These test results are the ground for the continuity of the tests under operation conditions in machine. The paper presents the test of new biodegradable hydraulic fluid type "Environmentally responsible tractor transmission oil" by designed special test device. The test evaluation was realized by technical state of concrete hydrostatic pump UD 25 which is used in tractors Zetor Forterra. This pump was loaded by cyclic pressure loading during the test with tested fluid. The evaluated parameter was flow efficiency of hydrostatic pump which reached the value 7.3% after the test. The reached value hints a high quality of the tested fluid (the limit value per standard is the flow efficiency decrease - 20%). Keywords: hydrostatic pump, cyclic pressure loading, testing device, flow characteristics Journal: Research in Agricultural Engineering Pages: 18-25 Volume: 56 Issue: 1 Year: 2010 DOI: 10.17221/26/2009-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/26/2009-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201001-0003.txt Handle: RePEc:caa:jnlrae:v:56:y:2010:i:1:id:26-2009-RAE Template-Type: ReDIF-Article 1.0 Author-Name: M. Aboonajmi Author-Workplace-Name: Faculty of Biosystem Engineering, University of Tehran, Karaj, Iran Author-Name: A. Akram Author-Workplace-Name: Faculty of Biosystem Engineering, University of Tehran, Karaj, Iran Author-Name: T. Nishizu Author-Workplace-Name: Faculty of Applied Biological Sciences, Gifu University, Gifu, Japan Author-Name: N. Kondo Author-Workplace-Name: Graduate School of Agriculture, Kyoto University, Kyoto city, Japan Author-Name: S.K. Setarehdan Author-Workplace-Name: Control and Intelligent Processing Centre of Excellence, Faculty of Electrical and Computer Engineering, University of Tehran, Tehran, Iran Author-Name: A. Rajabipour Author-Workplace-Name: Faculty of Biosystem Engineering, University of Tehran, Karaj, Iran Title: An ultrasound based technique for the determination of poultry egg quality Abstract: The present study investigates the possibility of the non-destructive prediction of the main quality indices of commercial eggs by calculating the ultrasound phase velocity within the egg material. The phase velocity of the ultrasound signal in the egg material was determined by analysing the recorded ultrasound signals using the Fast Fourier Transform. Three hundred commercial eggs (Boris Brown, 33 weeks age) from the first day of egg laying were purchased from a farm and divided in two groups. The first group was kept at the room temperature (22-25°C) and the second group was kept in a refrigerator (5°C). Every week, 25 eggs from both the room and the refrigerator were first submitted to the non-destructive ultrasound test at weekly basis at the room temperature. Immediately after testing, the air cell, the thick albumen heights, the Haugh unit and the yolk index of the eggs were also determined destructively for the comparison purposes. The results were analysed to find any possible correlation between the computed ultrasonic phase velocity and the destructive parameters, during a storage period of five weeks. The tests were carried out using an ultrasound beam with a frequency of 150 kHz with a sampling rate of 2.5 Gs/S on the eggs under a controlled temperature situation. Significant differences between the means of the destructive analysis on different days of the eggs storage were found using ANOVA. The results showed that the phase velocity significantly differs between the eggs stored at the room temperature and those stored in the refrigerator. It was found that the phase velocity decreased as the storage time of the eggs increased in three consecutive weeks. Keywords: phase velocity, poultry egg, quality, ultrasound, freshness Journal: Research in Agricultural Engineering Pages: 26-32 Volume: 56 Issue: 1 Year: 2010 DOI: 10.17221/18/2009-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/18/2009-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201001-0004.txt Handle: RePEc:caa:jnlrae:v:56:y:2010:i:1:id:18-2009-RAE Template-Type: ReDIF-Article 1.0 Author-Name: R. Ghabel Author-Workplace-Name: Department of Agricultural Machinery Engineering, Faculty of Agricultural Engineering and Technology, University of Tehran, Karaj, Iran Author-Name: A. Rajabipour Author-Workplace-Name: Department of Agricultural Machinery Engineering, Faculty of Agricultural Engineering and Technology, University of Tehran, Karaj, Iran Author-Name: M. Ghasemi-Varnamkhasti Author-Workplace-Name: Department of Agricultural Machinery Engineering, Faculty of Agricultural Engineering and Technology, University of Tehran, Karaj, Iran Author-Name: M. Oveisi Author-Workplace-Name: Department of Agricultural Machinery Engineering, Faculty of Agricultural Engineering and Technology, University of Tehran, Karaj, Iran Title: Modeling the mass of Iranian export onion (Allium cepa L.) varieties using some physical characteristics Abstract: Mass modeling can be used for development of post-harvest equipment related to onion (Allium cepa L.) processing such as grading, packing and food production processes. There are instances in which it is desirable to determine relationships among crop physical characteristics. In this study, the mass of Iranian export onion varieties (Azarshahr and Sefide Qom) was predicted by using different physical characteristics applying linear models with three different classifications: (1) - single or multiple variable regressions of onion dimensional characteristics, (2) - single or multiple variable regressions of onion projected areas, (3) - estimating onion mass based on measured (actual) volume and volumes of assumed shapes (prolate spheroid and ellipsoid). The results showed that mass modeling of onion based on length and three projected areas are the most appropriate models in the first and second classification, respectively. In third classification, the highest determination coefficient was obtained for mass modeling based on the actual volume as R2 = 0.99 whereas corresponding values were 0.96 for both assumed onion shapes (prolate spheroid and ellipsoid), respectively. In economical and agronomical point of view, suitable grading system of onion mass was obtained based on length as nonlinear relation M = 0.035a2 - 1.64a + 36.137, R2 = 0.96. Keywords: onion, vegetable, mass modeling, physical characteristics, grading Journal: Research in Agricultural Engineering Pages: 33-40 Volume: 56 Issue: 1 Year: 2010 DOI: 10.17221/23/2009-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/23/2009-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201001-0005.txt Handle: RePEc:caa:jnlrae:v:56:y:2010:i:1:id:23-2009-RAE Template-Type: ReDIF-Article 1.0 Author-Name: J. Blahovec Author-Workplace-Name: Faculty of Engineering, Czech University of Life Sciences in Prague, Prague, Czech Republic Author-Name: A. Yurov Author-Workplace-Name: Faculty of Engineering, Czech University of Life Sciences in Prague, Prague, Czech Republic Title: The influence of conductivity measurement on mechanical properties of potato tubers - Short communication Abstract: Deformation curves in uniaxial compression of raw potato tuber were analyzed at Nicola and Saturna varieties. In the first part of deformation (time 1 min), some part of specimens were loaded by electric field simulating simultaneous measurement of the specimen alternating-current conductivity (three levels of voltage 1, 5, and 10 V and three frequencies 1, 10, and 100 kHz). The obtained curves were analyzed by six parameters. In five of them no differences were approved statistically (α = 0.05). Only in the case of modulus of elasticity some differences were observed; however, the differences cannot be simply explained by the influence of the electric field. Keywords: potato, conductivity, deformation curve, voltage, frequency, deformation Journal: Research in Agricultural Engineering Pages: 41-46 Volume: 56 Issue: 1 Year: 2010 DOI: 10.17221/10/2009-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/10/2009-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201001-0006.txt Handle: RePEc:caa:jnlrae:v:56:y:2010:i:1:id:10-2009-RAE