Template-Type: ReDIF-Article 1.0 Author-Name: V. Šleger Author-Workplace-Name: Technical Faculty, Czech University of Agriculture in Prague, Prague, Czech Republic Author-Name: P. Neuberger Author-Workplace-Name: Technical Faculty, Czech University of Agriculture in Prague, Prague, Czech Republic Title: Using meteorological data to determine the risk of heat stress Abstract: This paper first proposes a technique of computing air temperature and humidity in stables based on outdoor air parameters and biological production of animals. The computation technique is outlined. The calculated values are then used to assess the potential of evaporation cooling in mild climatic conditions. Graphs illustrate the assumed effect of evaporation cooling equipment inside a stable housing of egg laying hens. Used in the computation were hourly meteorological readings obtained during the period May to August in years 2000 to 2002, in the locality with a potential installation of a cooling system. Other Graphs illustrate the time the animals spent in an environment with a particular air temperature. For instance in June 2002, the time animals in the stable were exposed to temperatures 27°C or higher was reduced by using an air cooling system from 39 h to 22 h, and in July 2002 from 33 h to 4 h. The envisaged model can be modified for other kinds of gallinaceous poultry and pigs. Keywords: laying hens, air temperature, air humidity, evaporation cooling, temperature-humidity index Journal: Research in Agricultural Engineering Pages: 39-47 Volume: 52 Issue: 2 Year: 2006 DOI: 10.17221/4878-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/4878-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-200602-0001.txt Handle: RePEc:caa:jnlrae:v:52:y:2006:i:2:id:4878-RAE Template-Type: ReDIF-Article 1.0 Author-Name: L. Holoubek Author-Workplace-Name: Department of Agriculture, Food and Environmental Engineering, Faculty of Agronomy, Mendel University of Agriculture and Forestry in Brno, Brno, Czech Republic Author-Name: R. Kukla Author-Workplace-Name: Department of Agriculture, Food and Environmental Engineering, Faculty of Agronomy, Mendel University of Agriculture and Forestry in Brno, Brno, Czech Republic Author-Name: R. Kadlec Author-Workplace-Name: Department of Agriculture, Food and Environmental Engineering, Faculty of Agronomy, Mendel University of Agriculture and Forestry in Brno, Brno, Czech Republic Title: Monitoring of glasshouse climatic processes with the proposal of their control Abstract: : The aim of this project was to carry out measurements of climatic process occurring in the glasshouse. This article describes the method of measuring the glasshouse microclimate using the Control WEB 2000 software and the ADAM 4000 series input/output modules. Control WEB 2000 is a graphic development environment to create measuring and control applications. Data acquisition was made by using the ADAM modules of 4000 series which ensure the conversion of data and their transmission from the sensors to the control computer. Soil temperature, glasshouse indoor and outdoor air temperatures and air humidity were analyzed during two summer months. The measuring application is further extended by a proposal for microclimate control in the glasshouse. Keywords: Control WEB, ADAM module, measurement, automation Journal: Research in Agricultural Engineering Pages: 48-54 Volume: 52 Issue: 2 Year: 2006 DOI: 10.17221/4879-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/4879-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-200602-0002.txt Handle: RePEc:caa:jnlrae:v:52:y:2006:i:2:id:4879-RAE Template-Type: ReDIF-Article 1.0 Author-Name: R. Gálik Author-Workplace-Name: Department of Animal Husbandry and Food Production mechanization, Faculty of Agricultural Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Author-Name: I. Karas Author-Workplace-Name: Department of Animal Husbandry and Food Production mechanization, Faculty of Agricultural Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Author-Name: Z. Tkáč Author-Workplace-Name: Department of Motor Vehicles and Heat Devices, Faculty of Agricultural Engineering, Slovak University in Nitra, Nitra, Slovak Republic Author-Name: J. Orság Author-Workplace-Name: Research Institute of Animal Production, Nitra, Slovak Republic Title: Measurement of exploitation parameters of the hen feeding line Abstract: The paper deals with the analysis of the operation of a hen feeding line in the reproduction breeding hall at the floor stabling type combined with the deep bedding on grates. We have measured the hen feeding line operation time in accordance with STN 47 0120, the losses of the fodder spilled by hens during a single feeding and the consumption of electricity of the observed line. As a result of the failure to carry out regular technical maintenance of the line as a preventive measure against the origin of defects, a relatively low value of the productive time use coefficient (0.77) was detected. Based on the analysis of the consumption of electric power, the electric engines driving individual segments of the line were found to be correctly dimensioned. Using the monitored technology, we managed to record excessive losses of the spilled feed mixture from the chain trough. For the whole farm it represents up to 702.8 kg of feedstuff per a day. The detected losses are very negatively projected into the economy of the production of one-day chickens. A negative and statistically highly conclusive correlation coefficient (r = -0.9230**) was recorded between the chickens age and the losses of feed. Keywords: feed losses, economy of chicken production, technical maintenance, consumption of electricity Journal: Research in Agricultural Engineering Pages: 55-60 Volume: 52 Issue: 2 Year: 2006 DOI: 10.17221/4880-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/4880-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-200602-0003.txt Handle: RePEc:caa:jnlrae:v:52:y:2006:i:2:id:4880-RAE Template-Type: ReDIF-Article 1.0 Author-Name: D. Herák Author-Workplace-Name: Department of Mechanics and Engineering, Technical Faculty, Czech University of Agriculture in Prague, Prague, Czech Republic Author-Name: V. Šleger Author-Workplace-Name: Department of Mechanics and Engineering, Technical Faculty, Czech University of Agriculture in Prague, Prague, Czech Republic Author-Name: R. Chotěborský Author-Workplace-Name: Department of Material and Engineering Technology, Technical Faculty, Czech University of Agriculture in Prague, Prague, Czech Republic Author-Name: K. Houška Author-Workplace-Name: HouseMax International, Ltd., Prague, Czech Republic Author-Name: E. Janča Author-Workplace-Name: Department of Mechanics and Engineering, Technical Faculty, Czech University of Agriculture in Prague, Prague, Czech Republic Title: Kinematical characteristic of mechanical frictional variable speed drive Abstract: The paper describes a new system of mechanical spherical conical friction drive. In the present a row of simple friction, belt, chain, wave and differential variable speed drives is published. For the required range of speed variation they are altogether unfit. The currently used power transmissions are of low efficiency (60-70%). Therefore the better power transmission efficiency is required. The possibility of multicontact power transmission appears as the most suitable principle of the power transmission. Using the designed function model, which was made according to the small tractor producers requirements, the real output kinematical characteristic was measured. It is derived the complete drive conversion unit kinematics and the theoretical kinematical characteristic design. The theoretical design is compared with the real characteristic determined by measuring using the test station. From the measured values we determined that the geometrical characteristic, i.e. the relation between output speed and ring position, corresponds in the ring position range (2.8/14) mm to the theoretical premise. Keywords: variable speed drive, friction drive, kinematical characteristic, kinematical design Journal: Research in Agricultural Engineering Pages: 61-68 Volume: 52 Issue: 2 Year: 2006 DOI: 10.17221/4881-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/4881-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-200602-0004.txt Handle: RePEc:caa:jnlrae:v:52:y:2006:i:2:id:4881-RAE Template-Type: ReDIF-Article 1.0 Author-Name: B. Havrland Author-Workplace-Name: Institute of Tropics and Subtropics, Czech University of Agriculture in Prague, Prague, Czech Republic Author-Name: M. Kavka Author-Workplace-Name: Technical Faculty, Czech University of Agriculture in Prague, Prague, Czech Republic Author-Name: M. Růžička Author-Workplace-Name: Technical Faculty, Czech University of Agriculture in Prague, Prague, Czech Republic Title: Influence of factors on the maize-grain mechanized technology net margin Abstract: a tendency to reduce number of operations by their association carries technical, environmental as well as economic aspects. Technical and environmental features are apparent and can be described with couple of quite logic positive effects and consequences. It is rather difficult to exactly identify economic proceeds that must especially be seen in producer's final perception (net margin). Methodology of net margin calculation is complicated and sometimes not fully transparent. A new (proper) methodological approach has been conceived in the concept of ATMP (Agricultural Technology Management Program). The Program is meant to provide the art of work to the extension worker in formulating sound and exact technological advice based upon both the availability of technological information (particularly on machinery sets and agronomic requirements) and rapid economic (costs) calculations. The program demonstrates an attempt to put into practice the concept of "precision technology" based on precision machinery inputs, which reduces machinery input costs. Preceding field survey carried out in August-September 2003 supplied basic data for technologies design and economic calculations. Five different mechanized technologies were conceived as provided with various operations and inputs: (1) classic mechanized technology composed of all necessary soil preparation, seeding, cultivation and harvesting operations; (2) direct sowing as a form of the minimum tillage (no soil preparation operations); (3) classic mechanized technology with farmyard fertilizing, (4) classical mechanized technology with combined cultivation operations; (5) classical mechanized technology with green manure. All technologies have been designed using Czech currency. The economic appropriateness of the respective technologies has been judged according to the main parameters of the crop budget that were selected for export to the comparison table. The parameters included in the comparison table were displayed in chart form. This enabled a better comparison of different parameters of the technologies. The main economic indicators that have been considered are the gross and net margins and own market price per ton of the product. Keywords: ATMP, precision technology, crop budget, comparison table, combined operation, corporate business plan Journal: Research in Agricultural Engineering Pages: 69-79 Volume: 52 Issue: 2 Year: 2006 DOI: 10.17221/4882-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/4882-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-200602-0005.txt Handle: RePEc:caa:jnlrae:v:52:y:2006:i:2:id:4882-RAE