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Articles by M.R. Alizadeh
Total Records ( 3 ) for M.R. Alizadeh
  H. Zareiforoush , M.H. Komarizadeh , M.R. Alizadeh , H. Tavakoli and M. Masoumi
  In order to predict the extent of mechanical damage of rice kernels during de-husking, milling, and other subsequent storage projects, information on such engineering properties of paddy grains as force and deformation curve must be provided. In this research, fracture resistance of paddy grain was determined in terms of grain rupture force and energy. The paddy grains were quasi-statically loaded in horizontal and vertical orientations at three moisture content levels of 8, 11, and 14% (w.b) and two loading rates of 5 and 10 mm min−1. In the current study, 12 treatments were performed as randomized complete block design with 10 replications. Based on the results obtained, as the moisture content of the paddy grain increased from 8 to 14% (w.b), the force required for initiating grain rupture decreased from 167.70 to 88.33 N and 43.55 to 21.68 N, and the energy absorbed at grain rupture increased from 13.08 to 34.39 mJ and 10.38 to 26.98 mJ, for horizontal and vertical orientations, respectively. This showed that the grains are more flexible in horizontal orientation. Furthermore, both the rupture force and energy decreased as the loading rate increased from 5 to 10 mm min−1.
  M. Payman , I. Bagheri , M.R. Alizadeh and R. Roohi
  One of the effective parameters on broken rice while hulling is the way in which the machinery like the paddy huller work. With regards to the nature of paddy hulling operation in the milling process some of the rice quality losses occur at this stage because the hulling operation is mechanical and consist of different stresses. Three varieties of Binam, Khazer and Alikazemi were used for the study. The levels of moisture content used in the tests were 9.5-11, 11-12.5 and 12.5-14% wet. The linear speed difference was chosen so that the linear speed of rollers was in the range of 200 to 275 m min-1. The results showed that the main effects of all parameters studied were significant on the amount of rice breakage. The main effects such as linear speed differences of rollers m min-1 and variety were significant on the hulling index and the counter effects of linear speed differences of rollers and m.c. were also significant on the hulling index but did not have a significant effect on the amount of rice breakage. The highest hulling index for the three varieties considered occurred with a roller linear speed difference of 236.7 m min-1 and the least rice breakage occurred when the roller linear speed difference were 229.3 m min-1. Under similar conditions the lowest rice breakage occurred with the Binam variety. The amount of rice breakage in the hulling process for the Alikazemi variety was significantly higher than the other two varieties. The highest broken rice in the hulling process for Alikazemi occurred at moisture content of 11-12.5% and for the other two varieties at 12.5-14%.
  M.R. Alizadeh , S. Minaei , T. Tavakoli and M.H. Khoshtaghaza
  The effect of de-awning on physical properties of paddy were evaluated as a function of grain moisture content at 5 levels ranging from 6.92 to 23.16% d.b. The average length, width, thickness, geometric mean diameter and sphericity of the grain increased from 10.19 to 10.27, .29 to 2.42, .84 to 1.93, .502 to 3.634 mm and 0.344 to 0.354, respectively, as the moisture content increased from 6.92 to 23.16% d.b. In the case of awned paddy, the thousand grain mass increased from 24.324 to 28.038 g, bulk density from 316.76 to 357.60 kg m-3, true density from 1326.2 to 1384.6 kg m-3 and the porosity decreased from 76.11 to 74.17, the angle of repose increased from 37.42 to 45.71°. The static coefficient of friction was significantly different on three structural surfaces namely, mild iron (0.464 to 0.511), galvanized iron (0.432 to 0.471) and rubber (0.496 to 0.558) at the moisture content range considered. In the case of de-awned paddy, the thousand grain mass increased from 23.980 to 27.734 g, bulk density from 546.10 to 593.00 kg m-3, true density from 1352 to 1397 kg m-3 and the porosity decreased from 59.62 to 57.55, the angle of repose increased from 34.46 to 42.68°, the static coefficient of friction increased from 0.434 to 0.518, 0.416 to 0.464 and 0.477 to 0.538 for mild steel, galvanized iron and rubber, respectively as moisture content increased from 7 to 23% d.b.
 
 
 
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