Research in Agricultural Engineering, 2013 (vol. 59), issue 1
LIST OF REVIEWERS 2012
editors
Res. Agr. Eng., 2013, 59(1):I | DOI: 10.17221/6677-RAE 
Optimization of anaerobic fermentation of kitchen wasteOriginal Paper
T. Dlabaja, J. Malaťák
Res. Agr. Eng., 2013, 59(1):1-8 | DOI: 10.17221/2/2012-RAE
Anaerobic fermentation is a suitable method of energetic and material utilisation of waste coming from restaurants and canteens. Laboratory experiments of wet anaerobic fermentation were performed in a continuous reactor and in batch reactors under mesophilic conditions. Effects of hydraulic retention time, organic loading rate, period of feeding and recirculation of digestate were examined in the continuous reactor. Effects of substrate pre-treatment (crushing, heating, freezing) were examined in the batch reactors. Degree of substrate degradation ranged between 83-85% within hydraulic retention time of 2-30 days. Appropriate organic loading rate...
Analysis of tangential curve equation describing mechanical behaviour of rapeseeds (Brassica napus L.) mixture under compression loadingOriginal Paper
D. Herák, A. Kabutey, M. Divišová
Res. Agr. Eng., 2013, 59(1):9-15 | DOI: 10.17221/73/2011-RAE
The analysis of tangential curve equation for describing mechanical behaviour of rapeseeds (Brassica napus L.) mixture under compression loading were discussed. Parameters considered in this study include both measured and theoretical amounts of deformation, volume compression and deformation energy. The measured amounts denoted as true deformation, true volume compression and true deformation energy were determined directly from the compression test of the rapeseeds pressed mixture whiles the theoretical amounts expressed as max. deformation, max. volume compression and max. deformation energy were determined by mathematical adjustment...
Overlay materials used for increasing lifetime of machine parts working under conditions of intensive abrasionOriginal Paper
M. Müller, P. Hrabě
Res. Agr. Eng., 2013, 59(1):16-22 | DOI: 10.17221/64/2011-RAE
We evaluated a degree of the machine part abrasive wear with secondary focus on their hardness. The paper states laboratory results of overlay systems from their wear resistance point of view. Laboratory experiments were carried out by two-body abrasion on bonded abrasive of a P120 granularity. The results proved an increased abrasive wear resistance of martensitic, ledeburitic and stellitic overlays against eleven different original products. The overlay UTP Ledurit 60 reached the optimum values. The GD-OES (Glow Discharge Optical Emission Spectroscopy) method proved the different chemical composition of the overlay from the stated chemical composition...
Effect of heat treatment on the microstructure, hardness and abrasive wear resistance of high chromium hardfacingOriginal Paper
R. Chotěborský
Res. Agr. Eng., 2013, 59(1):23-28 | DOI: 10.17221/62/2011-RAE
The effect of destabilization heat treatment on the microstructure, hardness, fracture toughness and abrasive wear resistance of high chromium hardfacing was investigated. The results from the study shows that the hardness, fracture toughness and abrasive wear resistance are influenced by temperature of destabilization heat treatment and air and furnace cooling conditions, respectively. Destabilization treatment of materials by furnace cooling caused higher secondary carbides in the dendritic austenite whilst by air cooling it showed smaller particles of secondary carbide. Also, it was found that destabilization temperature at 1,000°C improves hardness...
Research into the geometry of the delimbing head of cutting knivesOriginal Paper
J. Mikleš
Res. Agr. Eng., 2013, 59(1):29-34 | DOI: 10.17221/50/2011-RAE
Limbing with a wedge tool as a chipless operation is accompanied by a large deformation of wood in the cutting plane, i.e. at the spot of contact with the tool face as well as in the zone adjacent to this plane. The theory of chipless cutting says that the resistance of wood fibers to deformation is particularly the main component of resistance to the tool penetration into wood. The friction component (resistance component) on the tool surface is a function describing resistance to fibre deformation, its magnitude depending upon the value of friction coefficient. The magnitude of cutting force acting in a direction of the velocity vector is a resultant...
Challenges of designing a cracker for Morama bean - Short communicationShort Communication
Z. Tjiparuro
Res. Agr. Eng., 2013, 59(1):35-37 | DOI: 10.17221/68/2011-RAE
Experiments were done on Morama beans (Tylosema esculentum) using macadamia nut crackers. Results and subsequent design work done thereafter showed that the cracking of the beans, their alignment during cracking and separation of kernels from shells presented peculiar challenges unresolvable by conventional processes.