Template-Type: ReDIF-Article 1.0 Author-Name: editors Title: Index of volume 58 Journal: Research in Agricultural Engineering Pages: I-II Volume: 58 Issue: 4 Year: 2012 DOI: 10.17221/6484-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/6484-RAE.html File-Format: text/html Handle: RePEc:caa:jnlrae:v:58:y:2012:i:4:id:6484-RAE Template-Type: ReDIF-Article 1.0 Author-Name: Z. Strašil Author-Workplace-Name: Crop Research Institute, Prague, Czech Republic Title: Evaluation of reed canary grass (Phalaris arundinacea L.) grown for energy use Abstract: Field experiments with reed canary grass were conducted during 1996-2000 at four different sites (Ruzyně, Troubsko, Lukavec and Chomutov in the Czech Republic). In the period 2001-2009 the experiments were run at Ruzyně and Lukavec. During vegetation the following indicators were monitored: the course of weather in individual years at given sites and infestation of stands by pests and diseases. Furthermore, we monitored the effects of N application rates, year, site, as well as the effect of harvest time on yields of harvested biomass, moisture content, elements content, and energy content. The content of heavy metals in soils and subsequently in plants was also monitored. The zoning methodology was created for reed canary grass. The highest average dry matter yield of reed canary grass harvested in late autumn was achieved for comparable periods during 1996-2000 at Ruzyně (8.33 t/ha), and the lowest at Chomutov (6.80 t/ha). The greatest effect of N fertilization on yields was recorded at Ruzyně, where the N2 rate (80 kg/ha) increased the yield on average by 28.6% in comparison with the non-fertilized variants. Average loss of biomass over winter was 23.0%. Keywords: reed canary grass, yield, N fertilization, energy content, heavy metals, zoning Journal: Research in Agricultural Engineering Pages: 119-130 Volume: 58 Issue: 4 Year: 2012 DOI: 10.17221/35/2011-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/35/2011-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201204-0002.txt Handle: RePEc:caa:jnlrae:v:58:y:2012:i:4:id:35-2011-RAE Template-Type: ReDIF-Article 1.0 Author-Name: M. Mikleš Author-Workplace-Name: Department of Forest and Mobile Technologies, Faculty of Environmental and Manufacturing Technologies, Technical University in Zvolen, Zvolen, Slovak Republic Title: Determination of the technical parameters of shaping tools for delimbing head Abstract: It is usually a technical problem to find mathematical ideal shape of knives of delimbing head. Determination of their shape in the form of general curve could lead to the technically unfeasible dimensions of the head. Criterion of the optimal shape of cutting contour of head is tightness of encirclement of cross section of trunk by knives. Research attention was aimed at conics. Parabola is the most suitable curve for achieving the best quality of delimbing. Keywords: delimber, forest machine, delimbing tool Journal: Research in Agricultural Engineering Pages: 131-135 Volume: 58 Issue: 4 Year: 2012 DOI: 10.17221/51/2011-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/51/2011-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201204-0003.txt Handle: RePEc:caa:jnlrae:v:58:y:2012:i:4:id:51-2011-RAE Template-Type: ReDIF-Article 1.0 Author-Name: A. Janeček Author-Workplace-Name: Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: R. Adamovský Author-Workplace-Name: Faculty of Engineering, Czech University of Life Sciences Prague, Prague, Czech Republic Title: Optimisation of a clam bunk skidder from the emission production point of view Abstract: This article presents a proposal of a simple mathematical model for minimisation of the production of extraneous substances as a function of the rate of operation performance of a production system. The model is then verified by operation tests of the Terri 2040 clam bunk skidder and by determining the system's optimal rate of performance from the point of view of production of SO2, HC and NOx emissions. The operation tests conducted to verify the mathematical model have confirmed that conditions can be determined for the production system at which it produces minimum emissions. Min. values of SO2, and HC were achieved at approximately the same rate of performance of the clam bunk skidder. Minimum values of NOx were achieved at significantly higher rate of performance of the equipment. At the calculated optimal rate of operating performance of the Terri 2040 clam bunk skidder, the values of the produced emissions were determined per m3 of timber: SO2 = 1.00035 g/m3, HC = 7.796 g/m3 and NOx = 0.277 g/m3. Keywords: mathematical model, production system, combustion engine, rate of performance, emission, sulphur dioxide, unburned hydrocarbons, nitrogen oxides Journal: Research in Agricultural Engineering Pages: 136-141 Volume: 58 Issue: 4 Year: 2012 DOI: 10.17221/63/2011-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/63/2011-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201204-0004.txt Handle: RePEc:caa:jnlrae:v:58:y:2012:i:4:id:63-2011-RAE Template-Type: ReDIF-Article 1.0 Author-Name: M. Müller Author-Workplace-Name: Department of Material Science and Manufacturing Technology, Faculty of Engineering, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: D. Lukešová Author-Workplace-Name: Department of Animal Science and Food Processing in Tropics and Subtropics, Institute of tropics and subtropics, Czech University of Life Sciences Prague, Prague, Czech Republic Title: Ear tag mechanical properties under extreme climate conditions Abstract: The common ear tag production and application do not take into regard the demographic environment and climate of a target destination which are specified. However, this fact becomes a core of the problem. The necessity to characterize the ear tag bond comes out from the practical experience when applying incorrect exchange spike in the application punch by mistake. The aim of the experimental research was to carry out the evaluation of the ear tag mechanical qualities under increased and decreased temperatures on the base of the laboratory experiments together with the suitable and incorrect application of the exchange spike in the application punch. Different environment temperatures in the tested interval -20°C till 60°C should simulate one of the possible attribute of the potential application in the different climate. The constructional design of the ear tag bond was proposed on the basis of the laboratory tests. Keywords: application punch, function tests, identification, farming, animals, temperature Journal: Research in Agricultural Engineering Pages: 142-147 Volume: 58 Issue: 4 Year: 2012 DOI: 10.17221/65/2011-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/65/2011-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201204-0005.txt Handle: RePEc:caa:jnlrae:v:58:y:2012:i:4:id:65-2011-RAE Template-Type: ReDIF-Article 1.0 Author-Name: P. Heřmánek Author-Workplace-Name: Department of Agricultural Machines, Faculty of Engineering, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: A. Rybka Author-Workplace-Name: Department of Agricultural Machines, Faculty of Engineering, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: I. Honzík Author-Workplace-Name: Department of Agricultural Machines, Faculty of Engineering, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: L. Vent Author-Workplace-Name: CHMEL-Vent Ltd., Podbořany-Kněžice, Czech Republic Author-Name: B. Jošt Author-Workplace-Name: Department of Agricultural Machines, Faculty of Engineering, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: J. Mašek Author-Workplace-Name: Department of Agricultural Machines, Faculty of Engineering, Czech University of Life Sciences Prague, Prague, Czech Republic Title: Analysis of strength ratio of different hop strings Abstract: In plant-growing, minimization of impurities in the final product plays a more and more important role. One of the risky places that can influence the final purity of granules in hop growing is the way of hop strings hanging on the trellis supporting wire. The ideal state is when hop-field supporting wires stay clean and without any attachments after the hop vines had been pulled down. The article deals with different variants of hop strings hanging, a description of the measuring equipment, and a measurement of the pulling force itself at a field test, and a realization of break tests in laboratory conditions with both new and used wires and twines. Two-year results of field tests proved advantageousness of the hop string hanging variant in combination of a black annealed wire of 1.06 mm in diameter with a polypropylene twine of strength labelled as 12,500 in the form of a simple attachment, as well as variants combining the same wire and a jute twine labelled 2,200 × 2 in the form of a double attachment. Other variants using attachments made of jute or sisal are unsuitable due to a large number of fallen hopvines in vegetation period. Paper attachments will be put to further tests. Keywords: pulling down, hops, wire, twine Journal: Research in Agricultural Engineering Pages: 148-154 Volume: 58 Issue: 4 Year: 2012 DOI: 10.17221/33/2012-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/33/2012-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201204-0006.txt Handle: RePEc:caa:jnlrae:v:58:y:2012:i:4:id:33-2012-RAE Template-Type: ReDIF-Article 1.0 Author-Name: A. Kabutey Author-Workplace-Name: Department of Mechanical Engineering, Faculty of Engineering, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: D. Herák Author-Workplace-Name: Department of Mechanical Engineering, Faculty of Engineering, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: R. Chotěborský Author-Workplace-Name: Department of Material Science and Manufacturing Technology, Faculty of Engineering, Czech University of Life Sciences Prague, Prague, Czech Republic Author-Name: M. Navrátilová Author-Workplace-Name: Department of Mechanical Engineering, Faculty of Engineering, Czech University of Life Sciences Prague, Prague, Czech Republic Title: Model for energy and deformation determination of selected oilseeds under compression loading - Short communication Abstract: Compression loading test was performed to determine the dependency between force and deformation of jatropha, sunflower and rape seeds with respect to different pressing seed volume. Parameters such as max. deformation and energy were measured. The results which were statistically significant at (P < 0.05) show that rape seed with lower deformation values utilized greater energy than the seeds of jatropha and sunflower which obtained higher deformation values in that order of magnitude. The energy (J) was determined by the area under the force-deformation curve while deformation (mm) was obtained directly from the compression test. Based on the statistical analysis, the energy and deformation with respect to the different pressing seed volume of jatropha, sunflower and rape approximately showed linear relationship. Keywords: force-deformation curve, pressing seed volume, jatropha, sunflower, rape seeds Journal: Research in Agricultural Engineering Pages: 155-158 Volume: 58 Issue: 4 Year: 2012 DOI: 10.17221/17/2011-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/17/2011-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201204-0007.txt Handle: RePEc:caa:jnlrae:v:58:y:2012:i:4:id:17-2011-RAE