Research in Agricultural Engineering, 2016 (vol. 62), issue 3
Mechanical properties of composite material reinforced with textile waste from the process of tyres recyclingOriginal Paper
M. Müller
Res. Agr. Eng., 2016, 62(3):99-105 | DOI: 10.17221/32/2015-RAE 
The paper deals with the polymeric fibre composite with the reinforcement on the basis of the waste from the process of the tyres recycling. The aim of the research was the use of the material of cleaned textile waste from the process of the tyres recycling. The secondary waste raw material was used as filler in the composite. The subject of performed experiments was the polymeric composite, whose continuous phase was in a form of a two-component epoxy adhesive (GlueEpox Rapid) and a discontinuous phase in a form of microfibers from the process of tyres recycling. The experiments results proved that the composite materials based on the textile waste...
The experimental research of combine harvestersOriginal Paper
L. Špokas, V. Adamčuk, V. Bulgakov, L. Nozdrovický
Res. Agr. Eng., 2016, 62(3):106-112 | DOI: 10.17221/16/2015-RAE
The paper presents results of the experimental research of a middle-size combine harvester when used for harvest of winter wheat and spring barley in heavy harvest conditions. Based on the results obtained, it was possible to determine the effect of field conditions on the crop mass flow in combine harvester, grain losses, fuel consumption, and combine harvester field performance. It was found that grain moisture content and conditions of the crop stand have a significant effect on the work indicators of the combine harvester when compared with its technological parameters and crop mass flow.
Sensitivity analysis of key operating parameters of combine harvestersOriginal Paper
M. Kavka, M. Mimra, F. Kumhála
Res. Agr. Eng., 2016, 62(3):113-121 | DOI: 10.17221/48/2015-RAE
The sensitivity analysis of key operating parameters on the average annual sub-profit in a group of three combine harvesters operating in companies providing agricultural services were analysed. Based on the results of the cost analysis, the following key operating parameters with the greatest influence on the costs were identified: the purchase price of the machine, the price of fuel, maintenance costs, personnel costs and annual performance. These parameters were used in the sensitivity analysis to investigate their effect on unit costs. Changing the above-mentioned parameters is calculated within ± 30% from their mean value. To perform a...
Emission load of car service interiorsOriginal Paper
I. Vitázek, D. Michalíková, B. Vitázková, J. Klúčik
Res. Agr. Eng., 2016, 62(3):122-128 | DOI: 10.17221/5/2015-RAE
Car service centres are specific in terms of production of pollutants. The aim of the paper is to assess the quality of indoor environment of car service interiors with respect to the safe range of oxocarbon emission limits, concentration of gaseous and solid aerosols of selected chemical pollutants and occupational noise exposure. Measurements of concentration and exposure time indicated that the permitted limits were kept. CO concentration reached values in the range from 0 to 10 ppm, CO2 concentration was observed in the range from 493 to 967 ppm. Concentration of solid aerosol of polyester bitumen reached the maximum value of 0.37 mg/m3,...
Moisture and thermal diffusivity of lentil seed under convective infrared-microwave: Modelling with and without shrinkageOriginal Paper
R.A. Chayjan, S.A. Radmard
Res. Agr. Eng., 2016, 62(3):129-140 | DOI: 10.17221/24/2014-RAE
The effect of infrared radiation and microwave radiation on the moisture and thermal diffusivity characteristics of lentil seeds during infrared and microwave drying was investigated. Using mathematical equations, values and curves, moisture and thermal diffusivity were obtained. This study was to determine the moisture and thermal diffusivity of seed lentil with and without shrinkage at input temperatures 40°C and 60°C, infrared powers 1,000 W and 2,000 W and microwave power 270 W and 450 W, when the moisture content was reduced from 60 to 9% (d.b.). Drying rate was increased with increased air temperature, infrared radiation and microwave powers....
Rating of malt grist fineness with respect to the used grinding equipmentOriginal Paper
A. Smejtková, P. Vaculík, M. Přikryl, Z. Pastorek
Res. Agr. Eng., 2016, 62(3):141-146 | DOI: 10.17221/41/2015-RAE
Grain size distribution of grist is dependent on the type of grinding mill. The most widely used crushers used for malt grinding are roll grinding machines and dispersants are the disc mills. For rating of grist fineness grists made in the two-roller mill KVM 130/150 and dispersant the disk mill Skiold SK 2500 was used. The selected types of barley malt were processed: light malt, Munich malt, caramel malt and colouring malt. Rating of malt grist fineness was made with a help of sieve analysis using a "Pfungstadt sifter". Conclusions from the measurements are as follows: by using the two-roller mill the coarsest grist is got from caramel malt and the...
Changes in selected wine physical properties during the short-time storageOriginal Paper
P. Hlaváč, M. Božiková, Z. Hlaváčová, K. Kardjilova
Res. Agr. Eng., 2016, 62(3):147-153 | DOI: 10.17221/7/2015-RAE
This article is focused on the effect of temperature and short-term storage on the physical properties of wine made in Slovakia. All measurements were performed during temperature manipulation in the temperature interval approximately from 0°C to 30°C. Two series of rheologic and thermal parameters measurements and one of electric parameter were done. First measurement was done at the beginning of storage and then the same sample was measured after a short storage. Temperature relations of rheologic parameters and electric conductivity were characterized by exponential functions, which is in good agreement with the Arrhenius equation. In case of thermal...