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Articles by A. Jafari
Total Records ( 15 ) for A. Jafari
  H.S. Hassani , A. Jafari , S.S. Mohtasebi and A.M. Setayesh
  Grain losses due to harvesting with combine harvester is one of the main obsession in direction of wastes and losses control. For this purpose reduction of losses due to cutting platform of combine which comprises more than 50% of the entire harvesting losses, is one of the main and principle measures in decreasing the combine losses. The JD 1165 combine harvester manufactured by ICM. Company is equipped with variable pulley and belt mechanism for ground speed, which causes lots of vibration and increases the losses and depreciation of the machine. In this study the amount of losses of JD 1165 harvester combine equipped with variable pulley and belt mechanism has tested and investigated. For this purpose a typical JD 1165 combine was selected and adjusted for various functional specifications. Then in Markazi province a field with flat land was chosen, in which 307020 Shahriar and Bekras varieties planted in water farm and in seven repetitions so that the moisture of grains ranged between 8 to 12% the research was carried out. As consequences demonstrated, grain losses induced from platform of the investigated combine gained 1.29% and losses at the back of the combine was 0.96% on average in seven repetitions. In addition, the most amount of damaged grains achieved 10.8% at the speed of 850 rpm for the cylinder. Finally, suggestions were made in order to improve performance of the machine.
  H.S. Hassani , A. Jafari , S. Rafiee , S.S. Mohtasebi and A.M. Setayesh
  The JD 955 combine harvester manufactured by ICM. Company has two hydraulic circuits which are the principal circuit (dividing valve circuit) and the steering circuit. Therefore, investigation and inspection of defects of the hydraulic system used in combine, considering its functions in the machine is so significant. In this article the problems of the hydraulic system throughout JD 955 combine harvester and the way services are given for disappearing the problems, have been investigated. For this purpose some 90 combines were selected which had been supplied to the customers over the last one or two years. The 140 defects detected from their hydraulic circuits were analyzed then services supplied to the selected combines and actually after sales services were researched within some categories. Results showed that the hydraulic pump had the most problems and was spent the most expense. In addition, throughout the after sales service categories only charges of the defects had significant difference with each other. Finally some policies suggested in order to decrease and eliminate the defects.
  A. Jafari , H. Mirhossaini , B. Kamareii and S. Dehestani
  This study consisted of the determination of some physiochemical properties in drinking water samples from the Kohdasht region of the Lorestan, Iran, where drinking water sources are ground water. The purpose was to ascertain the quality of water from these sources. Samples were taken from sixteen sampling points and analyzed for the following parameters, Ca, Na, K, Mg, Mn, NO3- , NO- , SO42- , PO43- , F- , Cl- , TDS, EC, alkalinity, hardness and turbidity using the procedure outline in the standard methods. The data showed the variation of the investigated parameters in samples as follows: pH 7.5-7.76, Electrical Conductivity (EC) 705.67-976 μS cm-1, turbidity 0.1-0.4 NTU, PO43- 0.11-0.31 mg L-1, NO3- 11.44-41.36 mg L-1, NO2- 0.017-0.514 mg L-1, SO42- 44-90 mg L-1 and Mn 0.002-0.056 mg L-1. The concentrations of most of the investigated parameters in the sources of drinking water samples from Kohdasht region were within the permissible limits of the World Health Organization drinking water quality guidelines.
  A. Jafari and M. Nikian
  The present study tends to investigate the micromorphology, anatomy and palynology of four desert species of Salvia in center of Iran. For comparative micromorphology investigation, the shape of leaf, bracts and calyx were studied with SEM. To conduct the comparative study of anatomy characters, sections from stem were prepared using microtome and differential staining. In this part of investigation, arrangement of vessel and arrangement of tissues in stem were studied. For the palynology study, too, a comparative investigation on the species showed, the pollen was problate spheroidal, hexacolpate, bireticulate and semi- tectate or tectate. Finally, micromorphology study, is useful for identification of studied species.
  A. Jafari , H. Ejtehadi , N. Taghizadeh and B. Baradaran
  Five specimen of 9 populations and 17 populations of Muscari neglectum were analysed for karyotypic characters and seed proteins analysis respectively using multivariate statistical methods. Karyotypes were asymmetrical and placed in 2A and 2B classes of Stebbins karyotype classification. The level of ploidy were tetraploid, autopentaploid, hexaploid. Some of the popoulations showed decreasing and increasing aneuploidy. Seed protein analysis showed 32 bands which some of them were specific for a population. Cluster analysis of populations on the basis of karyotype and seed protein data carried out and showed close relation of the populations.
  A. Jafari and Y. Nasseh
  In present research anatomical studies carried out 11 species which growing in Khorassan Province (North-East of Iran). These species were divided to two groups, annual and perennial species. For comparative anatomy studying, cross sections from stem and leaf were prepared using microtome and differential staining. The characters of secondary xylem and axial parenchyma, arrangement of vessel and the arrangement of mesophyll were studied. The results showed the variation of internal structure didn`t have correspondence to taxonomy position.
  A. Jafari , M. Farsi , F. Soleimanian Shafa and N. Taghizadeh
  Salvia L. belongs to Lamiaceae family, have 900 species around the world. Seven of them distributed in Mashhad (North-East of Iran) which are following: S. spinosa L., S. staminae Montbr and Auch, S. sclarea L., S. chloroleuca Rech and Aell., S. virgata Jacq, S. chorassanica Bung. and S. nemorosa L. In present research seed proteins of Salvia sclarea L., S. spinosa L. and S. chloroleuca Rech and Aell. studied by sodium dodecylsulphate polyacrylamide gel electrophoresis (SDS-PAGE) method. The aim of present study was identifying the variation between seed protein in populations and relationship with morphological characters and geographical distance. Analysis showed 22 bands from which some of them were specific for a population. Cluster analysis of populations were carried out. The variation bands have correspondence to geographical distance and morphological characters.
  A. Jafari and M. Behroozian
  In order to investigate the karyotype of Dianthus, a study was carried out on nine populations of Dianthus crinitus, D. binaludensis (an endemic species in Iran) and D. polylepis in the North-East of Iran. For present research, 8- Hydroxy quinolein 0.0002 M and aceto-orcein were used as pretreatment solution and staining. The basic chromosome number of Dianthus was X= 15. D. binaludensis and D. polylepis were diploid, while D. crinitus was found to be tetraploid. In addition, for the first time the karyotypes of the three species of Dianthus were prepared and compared with their morphological characters. D. binaludensis and D. polylepis were found to be morphologically close, with the same ploidy level but D. crinitus differs from the other species by in that it is tetraploid suffruticous in habit, has white petals and a membranous herbaceous stigma with nerves.
  K. Kheiralipour , A. Tabatabaeefar , H. Mobli , S. S. Mohtasebi , S. Rafiee , A. Rajabipour and A. Jafari
  In this study, two theories for terminal velocity of fruits were proved by authors as KHAT1 and KHAT2 theories. Terminal velocity of Redspar apples was experimentally measured using water column and video camera. Some apple characteristics that affect on terminal velocity of apple based on proved theories were determined using standard methods. There is found that the most effective characteristics on apple terminal velocity were density and volume. The best equation for terminal velocity of Redspar apples was found with R2 = 0.69.
  Gh. Shams Khoramabadi , A. Jafari and J. Hasanvand Jamshidi
  The ability of Zygnema fanicum algal biomass to remove Hg (II) is investigated. The mercury biosorption process is studied through batch experiments at different temperatures with regard to the influence of contact time, initial mercury, shaking, concentration and pH. Batch equilibrium tests showed that at pH 8.5 the maxima of mercury absorption rate (80%) obtained. By increasing initial concentration, absorption rate increases (increases up to 7.5 mg L-1 after that it is almost constant). Time contact has a direct effect on biosorption up to 60 min after that it is almost constant or desorption occurred. Temperature has no significant effect on absorption rate.
  L. Fekri , A. Jafari , S. Fekri , A. Shafikhani , M. Vesaghi and G. Behzadi
  In this study by Thermal Chemical Vapor Deposition (TCVD) method, the synthesis of carbon nanotubes (CNTs) and temperature affects on the grown CNTs on the NiSio2 catalyst and 304-type stainless steel was investigated. The purification of the grown CNTs on the 304-type stainless steel was also investigated in this study. The synthesis and purification of the samples were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), termogravimetric analysis (TGA) and Raman spectroscopy. Our obtained result by SEM and TEM shows that densities of CNTs growth on the 304-type stainless steel are more than the CNTs growth on the NiSio2 catalyst and both of them have a bamboo structure. The synthesis of CNTs in the range 750 to 850°C are also investigated in this study. Optimum temperature for synthesis of CNTs on the NiSio2 catalyst is about 825°C and for the 304-type stainless steel is about 750°C. The purification process includes oxidation in the range 450to 750°C, washing with 5 mol hydrochloric acids, disperse with ultrasonic and filtration. Our obtained result by TGA indicates that the CNTs burn in 600°C. A comparison of the Raman spectroscopy before and after of purification shows that the D-band shape is less than the G-band that due to the samples purified. Hence, the reported 304-type stainless steel provides a good sample for synthesis of CNTs by TCVD method.
  A. Jafari and F. Jafarzadeh
  The present study tends to investigate the anatomy and palynology of Hymenocrater species in Northeast of Iran. To conduct the comparative study of anatomy characters, sections from stem and leaf were prepared using microtome and differential staining. In this part of investigation, arrangement of vessel in stem, stoma type and arrangement of mesophyll in leaf were studied. For the palynology study, too a comparative investigation on the species showed, the pollen was problate spheroidal, hexacolpate, bireticulate and semi- tectate. Finally a variation between the shape of lumina in eu-reticulate and supra reticulate of pollen was observed.
  K. Kheiralipour , A. Tabatabaeefar , H. Mobli , S. Rafiee , A. Sahraroo Sahraroo , A. Rajabipour and A. Jafari
  Several physical properties as physical characteristics, mechanical, hydrodynamic and nutritional properties of two apple varieties (Redspar and Delbarstival), were determined and compared using Duncan`s multiple ranges test. Physical characteristics such as: average fruit length, width, thickness, the geometric, arithmetic and equivalent mean diameter, projected area, surface area, sphericity index, aspect ratio, fruit mass, volume, true density and moisture content, were determined for both varieties. The coefficient of static friction on plastic, plywood and galvanized iron, flesh firmness, failure stress, modulus of elasticity were found. The terminal velocity, coming up time, bouncy and drag forces, as hydrodynamic properties and total dry matter, total soluble solid, pH and titratable acidity, as nutritional properties, were determined. It was concluded that most of properties of two apple varieties was statistically different at the one percent probability level.
  A. Jafari , Z. Fathi and M. Bemani
  Silene L. from Caryophyllaceae, comprises about 92 species in Iran which 16 species have been recorded from North-East of Iran. In present research, seven Silene species and four subspecies from four sections from Khorassan Razavi Province in North-East of Iran identified using floral segments morphology e.g. shape of calyx’s denth, margin of calyx’s denth, paracorolla shape and micromorphological characters like seed coat and pollen ornamentation. The results demonstrated using above mentioned characters are very useful for exact identification of Silene species.
  H.S. Hassani , A. Jafari , S.S. Mohtasebi and A.M. Setayesh
  Throughout the present research, the gears fatigue of the hydraulic pump for the principal circuit in JD 1165 harvester combine was investigated through the finite element method and using contact analysis for precise determination of the contact region of the engaged teeth so that their lifespan was estimated. For this purpose, first, the gears were modelled and with applying material specifications, contact and fatigue analysis were carried out sequentially utilising ANSYS software. The reason for performing this research was to study the intended gears behavior affected by fatigue phenomenon due to the cyclic loadings and to consider the results for more savings in time and costs, as two very significant parameters relevant to manufacturing. The results indicate that with fully reverse loading, one can estimate longevity of a gear as well as find the critical points that more possibly the crack growth initiate from. For the investigated gears, the most critical points were detected as nodes numbered 36573 and 37247. Furthermore, the allowable number of load cycles and using fully reverse loading was gained 0.9800E+07. It is suggested that the results obtained can be useful to bring about modifications in the process of the above-mentioned gears manufacturing.
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