Research in Agricultural Engineering, 2017 (vol. 63), issue 4
INDEX OF VOLUME 63 (2017)
editors
Res. Agr. Eng., 2017, 63(4):X1 | DOI: 10.17221/10402-RAE
Temperature effect on various biooils physical parametersOriginal Paper
Monika Božiková, Petr Hlaváč, Ľubomír Híreš, Zuzana Hlaváčová, Michal Valach, Vlasta Vozárová, Martin Malínek
Res. Agr. Eng., 2017, 63(4):145-151 | DOI: 10.17221/60/2015-RAE 
The article deals with thermal and rheological properties of two selected biooils (PL 64S - sample No. 1, and PL 04N - sample No. 2). For thermal parameters measurements, Hot wire method was used, for detection of rheological parameters rheometer Anton Paar MCR 102 was used and the density was measured by densimeter DM 40. For both biooil samples, two series of thermophysical parameters measurements were made. In the first series thermal conductivity and thermal diffusivity were measured at constant laboratory temperature. The second series was focused on identification of thermophysical parameters changes during temperature stabilisation. The parameters...
Estimation of the power consumed in disc crushers using a static analysisOriginal Paper
Antonio Cordova, Juan Manuel Zuñiga, Jose Luis Mantari, Helard Henry Alvarez
Res. Agr. Eng., 2017, 63(4):152-159 | DOI: 10.17221/68/2016-RAE
The classic forms of disc crusher disintegration simulations are faced using methods that associate their analysis to the stochastic nature of the process. This paper introduces a method that can solve the disc crusher disintegration simulation with a partially deterministic manner. The paper presents the result of the thrust force and the consumed power of disc crushers which is estimated by a static analysis of forces that interact within the discs (fixed and mobile). This methodology uses the calculation of forces and directions involved in the process of particle fragmentation. The fragmented material is characterized. The fragmentation process...
The effect of tine, wing, operating depth and speed on the draft requirement of subsoil tillage tinesOriginal Paper
Mohammad Askari, Gholamhossein Shahgholi, Yousef Abbaspour-Gilandeh
Res. Agr. Eng., 2017, 63(4):160-167 | DOI: 10.17221/4/2016-RAE
In this study, the effect of tine type, adding wing, operating depth and forward speed on the draft requirement of subsoil tillage tines was investigated in clay loam soil. Three subsoil tillage tines (subsoiler, bentleg and paraplow), four levels of forward speed (1.8, 2.3, 2.9 and 3.5 km/h), three levels of depth (30, 40 and 50 cm) and winged and no-wing tines were examined with the exception of bentleg as it would not be winged. It was revealed that draft of the tines is less affected by forward speed but is much affected by tine type, depth and wing. It was observed that an increase of speed and depth plus adding wing results in an increase of...
Investigation of solar-powered drip irrigation: The case study of the Jordan ValleyShort Communication
Christoforos Perakis, George Kyriakarakos, Nabeel Bani Hani, Shaker Hammad, Markos Damasiotis
Res. Agr. Eng., 2017, 63(4):168-171 | DOI: 10.17221/12/2016-RAE
Agriculture is the sector that consumes by far most water globally. Much research efforts aim at minimizing losses through the use of drip irrigation. Rural agricultural areas often do not have access to a main electrical grid to power the pumps needed for drip irrigation; it reduces the options in paying for a grid extension, getting a diesel generator or investing in an off-grid renewable energy system. In this paper, these alternatives are assessed technically and economically under real world conditions through the Jordan Valley case study. The results show that the autonomous photovoltaic (PV)-battery system is preferable to the use of a diesel...
Optimal laser marking of 2D data matrix codes on Cavendish bananasOriginal Paper
Indera Sakti Nasution, Thomas Rath
Res. Agr. Eng., 2017, 63(4):172-179 | DOI: 10.17221/26/2016-RAE
A traceability system is an effective tool to guarantee safety in horticultural products and to improve supply chain transparency. A direct data matrix (DM) code created with carbon dioxide laser (wavelength 10.6 µm) can be used as a trust mark on bananas. In this study, green bananas were marked with the above-mentioned CO2 laser. Subsequently, the samples were held under storage conditions. Images of the codes on bananas were captured by using two different cameras; i.e. hyperspectral imaging camera and charge-couple device (CCD) camera. Image processing was used for evaluating print quality of 2D codes based on the ISO/IEC 15415...
Extremely low frequency electromagnetic field generator suitable for plant in vitro studiesOriginal Paper
Riry Prihatini, Mohamad Puad Abdullah, Tuan Abdul Rashid bin Tuan Abdullah, Ismail Said, Halil Hussin, Norihan Mohamad Saleh
Res. Agr. Eng., 2017, 63(4):180-186 | DOI: 10.17221/47/2016-RAE
The extremely low frequency electromagnetic field (ELF-EMF) occurs naturally from the earth and artificially as a human invention. The objectives of this study were to develop a suitable ELF-EMF generator for in vitro plants culture studies and to determine the effect of ELF-EMF exposure on in vitro tobacco (Nicotiana tabacum) growth and chlorophyll content. An ELF-EMF generator, the coGEM 1,000 was constructed using four coils of copper wires that were connected to a transformer, multimeter and rheostat. The coGEM 1,000 suitable for tissue culture plants is able to produce stable and uniform 6 and 12 mT 50Hz ELF-EMF in the...