Template-Type: ReDIF-Article 1.0 Author-Name: M. Božiková Author-Workplace-Name: Department of Physics, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Author-Name: P. Hlaváč Author-Workplace-Name: Department of Physics, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Title: Comparison of thermal and rheologic properties of Slovak mixed flower honey and forest honey Abstract: The article deals with the comparison of thermal and rheologic properties of two types of honey - mixed flower honey and forest honey made in Slovak Republic. All honey parameters were measured during temperature manipulation in the temperature interval from 5 to 45°C. Two series of thermal and rheologic parameters measurements were done. Firstly samples of both types of fresh honey were measured at the beginning of storage and then the same samples of honey were measured again after one week of storage. The measuring of thermal parameters i.e. thermal conductivity, thermal diffusivity and specific heat was performed by the instrument Isomet 2104, which uses Hot Wire method, and the principle of measuring being based on the analysis of time-temperature relation. The measurements of dynamic viscosity were done by the viscometer Anton Paar (DV-3P), the principle of measuring being based on the dependence of the sample resistance on the probe rotation. Other rheologic parameters as kinematic viscosity and fluidity, were also determined. For the rheologic parameters measurements exponential relations are typical while for the thermal parameters linear relations were obtained. Keywords: samples of honey, temperature, thermophysical properties, rheological parameters, time of storage Journal: Research in Agricultural Engineering Pages: S1-S8 Volume: 59 Issue: SpecialIssue Year: 2013 DOI: 10.17221/43/2012-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/43/2012-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201310-0001.txt Handle: RePEc:caa:jnlrae:v:59:y:2013:i:SpecialIssue:id:43-2012-RAE Template-Type: ReDIF-Article 1.0 Author-Name: T. Šima Author-Workplace-Name: Department of Machines and Production Systems, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Author-Name: M. Dubeňová Author-Workplace-Name: Department of Production Engineering, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Title: Effect of crop residues on CO2 flux in the CTF system during soil tillage by a disc harrow Lemken Rubin 9 Abstract: Carbon dioxide is one of the most important greenhouse gases. Agriculture, especially soil tillage, contributes to CO2 emissions significantly. The aim of the paper was the comparison of the amounts of carbon dioxide emissions released from the soil into the atmosphere depending on the controlled traffic farming (CTF) and crop residues. Three variants of the experiment were realised: before the soil tillage, immediately after the soil tillage, and seven days after the soil tillage. The soil tillage was carried out after the harvest of winter wheat by disc harrow Lemken Rubin 9 with a tractor John Deere 8230 on the loamy soil. The monitoring points were selected in parts of the field with and without the crop residues and in trafficked and non-trafficked areas. The CTF system affects CO2 flux, the amounts of emissions from the non-trafficked areas being higher than those from the trafficked areas. The crop residues left on the field cause a decrease of CO2 flux. The incorporation of crop residues causes an increase of CO2 flux. Keywords: carbon dioxide, emissions from the soil, controlled traffic farming, soil compaction Journal: Research in Agricultural Engineering Pages: S15-S21 Volume: 59 Issue: SpecialIssue Year: 2013 DOI: 10.17221/46/2012-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/46/2012-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201310-0002.txt Handle: RePEc:caa:jnlrae:v:59:y:2013:i:SpecialIssue:id:46-2012-RAE Template-Type: ReDIF-Article 1.0 Author-Name: V. Cviklovič Author-Workplace-Name: Department of Electrical Engineering, Automation and Informatics, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Author-Name: D. Hrubý Author-Workplace-Name: Department of Electrical Engineering, Automation and Informatics, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Author-Name: M. Olejár Author-Workplace-Name: Department of Electrical Engineering, Automation and Informatics, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Author-Name: L. Priatková Author-Workplace-Name: Department of Electrical Engineering, Automation and Informatics, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Title: Gyroscope calibration with the method of simulated identification Abstract: The calibration of Micro-Electro-Mechanical System (MEMS) gyroscopes is important for the application in which an angle is measured. The equipment for the calibration of this sensor is not always available. In this case, the method of simulated identification can be used. Some of the conditions are: using different tracks with saving angular velocity measurements, knowledge of influencing variables with their monitoring, and knowledge of the initial and final states of the angle. Based on this information, an algorithm is designed for the correction of influencing parameters by computer equipment. In our case, offsets, gains, and cross coupling coefficients are calculated for each axis of a sensor ADIS16405BLMZ. The result is an error of up to 0.5°/min of movement. To obtain high accuracy results, it is necessary to reach the conditions which are described in this contribution. Keywords: simulation, angular velocity, Simpson's rule, MEMS sensors Journal: Research in Agricultural Engineering Pages: S22-S26 Volume: 59 Issue: SpecialIssue Year: 2013 DOI: 10.17221/47/2012-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/47/2012-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201310-0003.txt Handle: RePEc:caa:jnlrae:v:59:y:2013:i:SpecialIssue:id:47-2012-RAE Template-Type: ReDIF-Article 1.0 Author-Name: J. Kosiba Author-Workplace-Name: Department of Transport and Handling, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Author-Name: Z. Tkáč Author-Workplace-Name: Department of Transport and Handling, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Author-Name: Ľ. Hujo Author-Workplace-Name: Department of Transport and Handling, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Author-Name: B. Stančík Author-Workplace-Name: Department of Transport and Handling, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Author-Name: I. Štulajter Author-Workplace-Name: Department of Transport and Handling, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Title: The operation of agricultural tractor with universal ecological oil Abstract: This contribution presents the results of the research into the characteristics of ecological oil labelled MOL Farm UTTO Synt in the tractor operating conditions. Biodegradable fluid was applied in the gear and hydraulic circuits of the tractor Zetor Forterra 114 41. The fluid was assessed for contamination and lubrication properties by its effect on the wear of tractor hydraulic pump during the application. The hydraulic pump was removed from the tractor at specified time intervals because of its technical condition relating to the flow efficiency. The measurements were calculated as flow efficiency with minimum environmental impact of oil on the hydraulic pump wear. Keywords: synthetic oil, hydraulic pump, flow characteristic Journal: Research in Agricultural Engineering Pages: S27-S33 Volume: 59 Issue: SpecialIssue Year: 2013 DOI: 10.17221/48/2012-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/48/2012-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201310-0004.txt Handle: RePEc:caa:jnlrae:v:59:y:2013:i:SpecialIssue:id:48-2012-RAE Template-Type: ReDIF-Article 1.0 Author-Name: J. Rédl Author-Workplace-Name: Department of Machine Design, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Author-Name: V. Váliková Author-Workplace-Name: Department of Machine Design, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Title: Application of differential geometry in agricultural vehicle dynamics Abstract: This paper deals with the application of differential geometry methods to a precise calculation of the length of trajectory of an agricultural mechanism that moves on a sloping terrain. We obtained technical exciting function from experimental measurements, out of which we obtained the function of Euler's parameters by using computer processing. The processing of these parameters provided translational and angular velocities of the gravity centre of the systemic vehicle MT8-222, which performed the determined mounted manoeuvres. We obtained differential equations that describe the function of a spatial curve by the application of differential geometry methods. The length of the curve is obtained by a numerical solution of the differential equations formed. We used Dormand-Prince numerical method for the numerical solution. Next, we evaluated the error of the numerical integration for every calculation by reason of the stability of computation. We also addressed the geometric characteristics of the curves such as the radius of curvature. The mounted manoeuvres as well as the corresponding velocities, trajectories, and radiuses of curvature were processed in a graphic way. Keywords: trajectory modelling, numerical integration, radius of curvature Journal: Research in Agricultural Engineering Pages: S34-S41 Volume: 59 Issue: SpecialIssue Year: 2013 DOI: 10.17221/49/2012-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/49/2012-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201310-0005.txt Handle: RePEc:caa:jnlrae:v:59:y:2013:i:SpecialIssue:id:49-2012-RAE Template-Type: ReDIF-Article 1.0 Author-Name: R. Drlička Author-Workplace-Name: Department of Quality and Engineering Technologies, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Author-Name: J. Žarnovský Author-Workplace-Name: Department of Quality and Engineering Technologies, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Author-Name: R. Mikuš Author-Workplace-Name: Department of Quality and Engineering Technologies, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Author-Name: I. Kováč Author-Workplace-Name: Department of Quality and Engineering Technologies, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Author-Name: M. Korenko Author-Workplace-Name: Department of Quality and Engineering Technologies, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Title: Hard machining of agricultural machines parts Abstract: For the renovation and/or improvement of the surface properties of machine elements, hard facing is often used. Hard structures obtained in layers or by heat treatment achieve a hardness of up to 68 hardness (HRC) or even more. The grinding of these surfaces demands the use of processing fluids and causes sometimes changes in the surface layers structure. Hard turning can replace grinding when certain requirements are fulfilled, particularly tough machining system. Hard deposits of two weld-on materials on a sample of steel grade S235JRG1 have been turned using cemented carbide inserts with a TiAlN coating of PVD type. The surface roughness measurements along with the observation of insert wear have been conducted to find proper machining parameters and conditions for this application. Cutting inserts manufacturer guidelines for special application could be insufficient or even not provided. Besides that, it is necessary in the experiments to take into account and examine the cutting ceramics and cubic boron nitride (CBN)/polycrystalline cubic boron nitride (PCBN). Keywords: hard turning, tool wear, surface quality, roughness, hardness Journal: Research in Agricultural Engineering Pages: S42-S48 Volume: 59 Issue: SpecialIssue Year: 2013 DOI: 10.17221/50/2012-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/50/2012-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201310-0006.txt Handle: RePEc:caa:jnlrae:v:59:y:2013:i:SpecialIssue:id:50-2012-RAE Template-Type: ReDIF-Article 1.0 Author-Name: I. Vitázek Author-Workplace-Name: Department of Transport and Handling, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Author-Name: J. Havelka Author-Workplace-Name: Department of Transport and Handling, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Title: I-x-w diagram of wet air and wheat grain Abstract: The authors have been working for 50 years in the research and development of drying in agriculture. In the way of drying applied, warmed air is used as the drying medium. The thermodynamics of wet air is used for the analysis of these processes of drying in the calculations and in graphic demonstrations applying an i-x diagram of wet air. This diagram does not include any information about the state of the dried material. The authors therefore enlarged this i-x diagram with the equilibrium moisture contents of the dried material. In their work, the authors present a method using this enlarged diagram and, as an example, the i-x-w diagram of wet air and equilibrium moisture of wheat grain. Keywords: drying in agriculture, equilibrium moisture, thermodynamics, sorption isotherm Journal: Research in Agricultural Engineering Pages: S49-S53 Volume: 59 Issue: SpecialIssue Year: 2013 DOI: 10.17221/53/2012-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/53/2012-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201310-0007.txt Handle: RePEc:caa:jnlrae:v:59:y:2013:i:SpecialIssue:id:53-2012-RAE Template-Type: ReDIF-Article 1.0 Author-Name: Š. Pogran Author-Workplace-Name: Department of Structures, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Author-Name: T. Reichstadterová Author-Workplace-Name: Department of Structures, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Author-Name: J. Lendelová Author-Workplace-Name: Department of Structures, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Author-Name: D. Páleš Author-Workplace-Name: Department of Structures, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Author-Name: W. Bieda Author-Workplace-Name: Department of Rural Buildings, Faculty of Environmental Engineering and Land Surveying, University of Agriculture in Kraków, Kraków, Poland Author-Name: M. Bošanský Author-Workplace-Name: Department of Structures, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Title: Verification of agro-production building structures affecting the quality of indoor environment in the summer season Abstract: This contribution focuses on the evaluation of the effect of aerated concrete external wall of a hall falling within the category of special-purpose agricultural buildings in terms of the phase shift of temperature oscillation. The assessment was performed by precise and approximate calculation procedures and was then compared with the results obtained from the values actually measured under the operating conditions. Keywords: phase shift of temperature oscillation, temperature damping, external cladding Journal: Research in Agricultural Engineering Pages: S54-S59 Volume: 59 Issue: SpecialIssue Year: 2013 DOI: 10.17221/55/2012-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/55/2012-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201310-0008.txt Handle: RePEc:caa:jnlrae:v:59:y:2013:i:SpecialIssue:id:55-2012-RAE Template-Type: ReDIF-Article 1.0 Author-Name: V. Kažimírová Author-Workplace-Name: Department of Production Engineering, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Author-Name: T. Brestovič Author-Workplace-Name: Department of Power Engineering, Faculty of Mechanical Engineering, Technical University of Košice, Košice, Slovak Republic Author-Name: R. Opáth Author-Workplace-Name: Department of Production Engineering, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Title: Selected properties of agricultural biomass Abstract: The presented contribution deals with the quantification of moisture, combustible matter content, ash content and higher heating value of the selected types of biomass used for the heat production by direct combustion. The moisture, combustible matter, and ash contents were determined by gravimetric analysis in accordance with the established standards. The average moisture of the materials examined varied from 4.35 to 9.17%; the combustible matter content in the original samples ranged from 79.46 to 93.51%; the ash content ranged from 2.14 to 11.28%. Higher heating values of the examined types of biomass varied from 14,996 to 17,641 kJ/kg. The main contribution of the thesis is the acquisition of values usable in subsequent theoretical and practical efforts to increase the efficiency of the heat production by direct combustion of biomass. The results are useable in biomass boiler design and in identifying suitable conditions for combustion, including the service parameters of biomass boilers. Keywords: gravimetry, dry mass, combustible matter, ash, higher heating value Journal: Research in Agricultural Engineering Pages: S60-S64 Volume: 59 Issue: SpecialIssue Year: 2013 DOI: 10.17221/58/2012-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/58/2012-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201310-0009.txt Handle: RePEc:caa:jnlrae:v:59:y:2013:i:SpecialIssue:id:58-2012-RAE Template-Type: ReDIF-Article 1.0 Author-Name: V. Rataj Author-Workplace-Name: Department of Machines and Production Systems, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Author-Name: J. Galambošová Author-Workplace-Name: Department of Machines and Production Systems, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Author-Name: M. Vašek Author-Workplace-Name: Department of Machines and Production Systems, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Title: Determining the guidance system accuracy with the support of a large GNSS dataset Abstract: Several methods are used presently to assess the accuracy of machinery guidance systems. However, these offer a limited number of records and are time and cost consuming. As the machinery is often equipped with a monitoring system for the management purposes, these data can be used. The aim of this work was to develop and verify a method to determine the accuracy of the machinery guidance systems based on a large dataset obtained from the machinery monitoring system. The proposed method uses the transformation of global navigation satellite systems (GNSS) data into a rectangular coordinate system SJTSK (National projection system - Krovak projection). Based on the geometry principle, the ideal line can be determined, and afterwards, the off-track error of each actual position can be calculated. After the verification of this method, it can be concluded that it brings benefits in terms of further use of the data from the monitoring systems, the estimation of the error based on a robust dataset, elimination of subjective and measurement method errors, as well as spatial localisation of the off-track errors at the field. Keywords: off-track error, geometry, rectangular coordinate system SJTSK Journal: Research in Agricultural Engineering Pages: S65-S70 Volume: 59 Issue: SpecialIssue Year: 2013 DOI: 10.17221/60/2012-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/60/2012-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201310-0010.txt Handle: RePEc:caa:jnlrae:v:59:y:2013:i:SpecialIssue:id:60-2012-RAE Template-Type: ReDIF-Article 1.0 Author-Name: M. Dubeňová Author-Workplace-Name: Department of Production Engineering, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Author-Name: R. Gálik Author-Workplace-Name: Department of Machines and Production Systems, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Author-Name: Š. Mihina Author-Workplace-Name: Department of Machines and Production Systems, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Author-Name: T. Šima Author-Workplace-Name: Department of Machines and Production Systems, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic Title: Ammonia concentration in farrowing pens with permanent limited range of motion for lactating sows Abstract: Livestock production significantly contributes to emissions of polluting gases emissions like ammonia (NH3) and greenhouse gases. Pig production is globally responsible for about 15% of ammonia emissions. The aims of this paper were the comparison of the ammonia concentrations in the farrowing pens with permanent limited range of motion between the zones of lactating sows and piglets and the impact of the day hour on ammonia concentration in this place. Photoacoustic infrared measuring devices INNOVA were used. The average values of NH3 concentration ranged from 0.787738 ppm (0.547478 mg/m3) to 0.818091 ppm (0.568573 mg/m3). The minimum concentration of NH3 was measured in the second lactating sows zone (0.262535 ppm, 0.182462 mg/m3) and the maximum concentration was measured in the piglets zone (1.61803 ppm, 1.124531 mg/m3). Values measured met the requirements of the Decree No. 230/1998 of the Ministry of Agriculture and Rural Development of the Slovak Republic which allows the maximum concentration of NH3 in the pig building 20 ppm (13.9 mg/m3). There were no differences between the concentrations of the greenhouse gases (GHGes) in the zones of lactating sows and piglets. Keywords: gas, farrowing pen, pig, piglet Journal: Research in Agricultural Engineering Pages: S9-S14 Volume: 59 Issue: SpecialIssue Year: 2013 DOI: 10.17221/45/2012-RAE File-URL: http://rae.agriculturejournals.cz/doi/10.17221/45/2012-RAE.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201310-0011.txt Handle: RePEc:caa:jnlrae:v:59:y:2013:i:SpecialIssue:id:45-2012-RAE