Template-Type: ReDIF-Article 1.0
Author-Name: R. Koutný
Author-Workplace-Name: Department of Mechanics and Machanical Engineering, Faculty of Technology, Czech University of Life Sciences in Prague, Prague, Czech Republic
Author-Name: B. Čechová
Author-Workplace-Name: J.E. Purkyně University in Ústí nad Labem, Ústí nad Labem, Czech Republic
Author-Name: P. Hutla
Author-Workplace-Name: Research Institute of Agricultural Engineering, Prague-Ruzyně, Czech Republic
Author-Name: P. Jevič
Author-Workplace-Name: Research Institute of Agricultural Engineering, Prague-Ruzyně, Czech Republic
Title: Properties of heat briquettes on basis of cotton processing waste
Abstract: Cotton dust is a waste produced in the cotton spinning mill. This matter in mixture with grain straw and additive of brown coal was used for heat briquettes production. Mechanical properties, energy and emission parameters were investigated during their incineration. The blended briquettes and those with coal additive have better use properties as compared with briquettes produced from pure cotton dust.
Keywords: heat briquettes, cotton, waste, biofuels, energy renewable resources, emission parameters, emissions
Journal: Research in Agricultural Engineering
Pages: 39-46
Volume: 53
Issue: 2
Year: 2007
DOI: 10.17221/2119-RAE
File-URL: http://rae.agriculturejournals.cz/doi/10.17221/2119-RAE.html
File-Format: text/html
X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-200702-0001.txt
Handle: RePEc:caa:jnlrae:v:53:y:2007:i:2:id:2119-RAE

Template-Type: ReDIF-Article 1.0
Author-Name: J. Musil
Author-Workplace-Name: Faculty of Agronomy, Mendel University of Agriculture and Forestry in Brno, Brno, Czech Republic
Author-Name: J. Červinka
Author-Workplace-Name: Faculty of Agronomy, Mendel University of Agriculture and Forestry in Brno, Brno, Czech Republic
Title: Measuring of pulling resistance in machinery with passive working organs
Abstract: A determination of the total pulling resistance of machinery is important in light of its dimensioning as well in light of energy requirements of processed operation. There are several methods to determine it. They can be divided to analytical methods (Goryachkin) and to methods of measurement in field-laboratory conditions using different kinds of force sensors. The most frequently used type is a sensor on the base of tensiometer, which was used during our work. Measured pulling resistance at three working speeds and at ranges of used depths of soil processing 82-122 mm was 9.6-17.4 kN with variation coefficient up to 10%. This measure has proved a dependence of the total pulling resistance on used depth of soil processing however dependence on speed of operation was practically insignificant. Machinery work quality was evaluated by determination of weight of plants matter on the field surface and by quantification of its percentage in total plant matter on the same area. The measured percentage range of plant matter on the field surface was 67.2-4.6% at working speed 8-14 km/h.
Keywords: tillage, disk harrow, measuring equipment, field experiments
Journal: Research in Agricultural Engineering
Pages: 47-53
Volume: 53
Issue: 2
Year: 2007
DOI: 10.17221/2121-RAE
File-URL: http://rae.agriculturejournals.cz/doi/10.17221/2121-RAE.html
File-Format: text/html
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Handle: RePEc:caa:jnlrae:v:53:y:2007:i:2:id:2121-RAE

Template-Type: ReDIF-Article 1.0
Author-Name: J. Turza
Author-Workplace-Name: Faculty of Special Technologies, Alexander Dubcek University in Trencin, Trencin, Slovak Republic
Author-Name: Z. Tkáč
Author-Workplace-Name: Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Author-Name: M. Gullerová
Author-Workplace-Name: Faculty of Special Technologies, Alexander Dubcek University in Trencin, Trencin, Slovak Republic
Title: Geometric displacement volume and flow in the phase of a two-phase hydraulic converter
Abstract: The paper researches the possibilities to replace the parallel flow hydraulic mechanisms in agricultural machinery with hydraulic units with fluid alternating flow as they provide more efficient operation due to their output alternating motion. The method being presented analyses how the geometric displacement volume in the fluid alternating piston converter is created. This is basically achieved by adding or omitting elements in the phase which consequently reduces the quantity of converter types being manufactured.
Keywords: geometric displacement volume, alternating flow, two-phase mechanism
Journal: Research in Agricultural Engineering
Pages: 54-66
Volume: 53
Issue: 2
Year: 2007
DOI: 10.17221/2122-RAE
File-URL: http://rae.agriculturejournals.cz/doi/10.17221/2122-RAE.html
File-Format: text/html
X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-200702-0003.txt
Handle: RePEc:caa:jnlrae:v:53:y:2007:i:2:id:2122-RAE

Template-Type: ReDIF-Article 1.0
Author-Name: M. Müller
Author-Workplace-Name: Department of Material and Engineering Technologies, Faculty of Technology , Czech University of Life Sciences in Prague, Prague, Czech Republic
Author-Name: R. Chotěborský
Author-Workplace-Name: Department of Material and Engineering Technologies, Faculty of Technology , Czech University of Life Sciences in Prague, Prague, Czech Republic
Author-Name: J. Krmela
Author-Workplace-Name: Faculty of Production Technology and Management, J.E. Purkyně University in Ústí nad Labem, Ústí nad Labem, Czech Republic
Title: Technological and constructional aspects affecting bonded joints
Abstract: Adhesive bonding is one of many materials connecting methods. In the last ten years periods the bonding technology noted a boom almost in all industrial branches. The use of bonding technology in the engineering and repairing industry brings considerable savings. Saving in costs, in critical metallic materials and in time are reached and the decrease of the joint weight, too. Therefore the bonding technology pertains to the modern jointing methods even though it is a very old technique. The adhesive bonding technology is influenced by a number of factors which affect the adhesive bond strength. Correcting coefficients have to be considered in construction calculations too. The correcting coefficients correct the strength deviations caused by particular factors. In the paper there are published laboratory experiments results.
Keywords: bonding technology, construction, corrective coefficients, testing of adhesive bonds
Journal: Research in Agricultural Engineering
Pages: 67-74
Volume: 53
Issue: 2
Year: 2007
DOI: 10.17221/2120-RAE
File-URL: http://rae.agriculturejournals.cz/doi/10.17221/2120-RAE.html
File-Format: text/html
X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-200702-0004.txt
Handle: RePEc:caa:jnlrae:v:53:y:2007:i:2:id:2120-RAE

Template-Type: ReDIF-Article 1.0
Author-Name: M. Gancarz
Author-Workplace-Name: Institute of Agrophysics, Polish Academy of Sciences, Lubin, Poland
Author-Name: K. Konstankiewicz
Author-Workplace-Name: Institute of Agrophysics, Polish Academy of Sciences, Lubin, Poland
Title: Changes of cellular structure of potato tuber parenchyma tissues during storage
Abstract: The presented work is continuation of researches on cellular structure of potato tuber parenchyma tissue. It concerns changes of the potato tuber cellular structure parameters during storage. Tubers of two varieties: Andromeda and Pasat were tested, 5 tubers for each variety and storage period. Cylindrical samples 10 mm in diameter and 1 mm thick were taken out of two types of tissues - potato pith and internal parenchyma from each tuber. Images of the tissues in natural state were taken with optical confocal microscope. Technique elaborated earlier by the author was used to obtain images containing number of cells sufficient for statistical analysis. As the result of analysis performed following mean values parameters of cell size and shape were used: surface area of plane section of the cell A (μm2) and cell elongation E. The results show differences between cell size for potato pith and internal parenchyma Andromeda variety and storage period. For this smaller values of the area of cell were obtained just after harvest. No differences of area of cell were observed for Pasat variety, and no differences in elongation of cell were observed for all varieties.
Keywords: parameters of cell structure, parenchyma tissue of potato tuber, optical confocal microscope, image analysis
Journal: Research in Agricultural Engineering
Pages: 75-78
Volume: 53
Issue: 2
Year: 2007
DOI: 10.17221/2118-RAE
File-URL: http://rae.agriculturejournals.cz/doi/10.17221/2118-RAE.html
File-Format: text/html
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Handle: RePEc:caa:jnlrae:v:53:y:2007:i:2:id:2118-RAE