Papers by Akbar Arabhosseini
Biomass & Bioenergy, Apr 1, 2010
Moisture sorption isotherms of milled switchgrass (Panicum virgatum) were developed to provide gu... more Moisture sorption isotherms of milled switchgrass (Panicum virgatum) were developed to provide guidelines for proper storage and drying of biomass. Samples were stored for a minimum of 8 days inside incubators set at 15°C, 25°C, or 35°C at different relative humidities, ranging from 16% to 88%. Equilibrium moisture content (EMC) data were fitted with the Henderson model and modified versions of the Chung-Pfost, Guggenheim-Anderson-deBoer (GAB), Halsey, Henderson, and Oswin models. The modified GAB model (R 2 = 0.99; SE = 0.58% d.b.) followed by the modified Henderson model (R 2 = 0.99; SE = 0.68% d.b.) produced randomized residuals and the best fit for milled switchgrass. The results have practical applications in the handling, drying, storage, and transportation of switchgrass to ensure that quality deterioration and spoilage by microorganisms are minimized.
Journal of the Science of Food and Agriculture, 2006
The effect of hot air-drying on the essential oil constituents and yield in French and Russian ta... more The effect of hot air-drying on the essential oil constituents and yield in French and Russian tarragon (Artemisia dracunculus L.) leaves was studied. The tarragon leaves were dried at air temperatures ranging from 40 to 90 • C. The drying stopped when the moisture content of the samples reached 10% or for some of the treatments reached 7, 20 and 30%. The essential oil of the fresh and dried leaves was isolated by hydrodistillation and analysed by capillary gas chromatography and gas chromatography-mass spectrometry. The decrease of oil during the drying process was highest at 60 • C drying temperature. For French tarragon the decrease in the amount of oil was significantly lower at 90 • C. The effect of the relative humidity of the drying air at each temperature was not significant. The main compounds were estragole in French tarragon (69%) and sabinene in Russian tarragon (40%). The drying process changed the relative percentage of the constituents in the oil; for instance, the relative percentages of estragole decreased and sabinene increased in French tarragon.
Journal of Engineering Studies and Research, 2011
Depth control system is important in bulb crop harvester. The higher the depth causes the greater... more Depth control system is important in bulb crop harvester. The higher the depth causes the greater amount of soil entering to harvesting system. A proper depth control leads to optimize energy consumption. A four-bar mechanism was used in order to move the blade of the machine and to control the operation depth while a DC electrical motor provided the movement of the blade. The four-bar mechanism consisted of a power screw, linkage bars, moveable pin and a blade. A control system was used to follow the uneven ground surface and control the displacement of the blade by sending commands to the DC electrical motor. The tests were carried out in laboratory on artificial uneven ground in sinuous curves as well as square and triangle shapes. The displacement of the blade was recorded by a digital camera and converted to image and analyzed using Matlab software. All the tests were replicated three times. The photo sensor responded better than the capacitive sensor for all obstacle shapes.
Physical and mechanical properties of pellets are needed to make pellet form in storage of raw ma... more Physical and mechanical properties of pellets are needed to make pellet form in storage of raw materials and energy consumption. Dairy cattle manure, sieved by a two-level size of 30 and 50, were used to make pellets by a hydraulic press with mold diameter of 6 mm, in five moisture levels of 15%, 17.5%, 20%, 22.5% and 25% and two pressure levels of 100 and 150 MPa. The results of the tests were analyzed using Excel and MATLAB softwares. Results showed that the compression energy as well as friction energy of size 30 increased with the increasing moisture content from 15% to 20%, and decreased with the increasing moisture content from 20% to 25%, and both are under pressure levels of 100 and 150 MPa. The compression energy and friction energy of the size 50 decreased with the increasing moisture content for both pressure levels of 100 and 150 MPa. The energy consumption of compression was found to be greater at the pressure of 150 MPa than that of 100 MPa. The greater amount of energ...
Journal of Agricultural Machinery, 2012
In this research, solar drying of a thin layer of tomato slices was evaluated. The experiments we... more In this research, solar drying of a thin layer of tomato slices was evaluated. The experiments were carried out at the air velocities of 0.5 and 1.0 m s-1 and thicknesses of 3, 5 and 7 mm. In order to find the most suitable form of thin layer drying model, nine different mathematical drying models were fitted to the experimental data to determine the pertinent coefficients of each model. The goodness of the fit was determined by calculating and comparing the values of the correlation coefficient (R^2 ) Root mean square error (RMSE) and chi-square (χ^2) for all models. The Page model with R^2=0.9974 ,χ^2=0.01351 , RMSE=0.002 showed the best fit.
A velocity converter was designed to change the rotational speed of input shaft to different desi... more A velocity converter was designed to change the rotational speed of input shaft to different desirable rotational speed at output shaft continuously. The converter consists of three similar four-bar linkages, which the follower link oscillates by complete rotation of the crank link. A one-way cam clutch bearing was installed on the output shaft for each mechanism to transfer the rotation at one dirction. The three mechanisms are located on unique input and output shafts with 120 degree difference in phases to guarantee continuous rotation at output shaft. The length of the follower link is changeable while the lengths of the other links are fixed to vary the rotation ratio of input and output shafts. The relevant lengths of the links were found to be 2.5 cm for crank, 8 cm for coupler link and 10 cm for ground link while the length of rocker is variable from 5 to 12 cm. The converter locates between the career wheel and the metering system to provide different rotations of the meter...
Acceleration the drying process of oleaster (Elaeagnus angustifolia L.) using reflectors and desiccant system in a solar drying system
Renewable Energy, 2021
Abstract In present work, a flat plate collector assisted with reflecting system and desiccant wh... more Abstract In present work, a flat plate collector assisted with reflecting system and desiccant wheel was used to dry oleaster fruit (Elaeagnus angustifolia L.). Three levels of air flow rate (0.025, 0.05 and 0.09 kg/s) and different dryer conditions: with reflectors (WR), with reflectors and desiccant wheel (WRD) and without reflectors and desiccant wheel (WORD) were considered to dry single layer of oleaster. The results indicated that the effect of using reflectors and desiccant system on extraction moisture from product was significant (P
Design of a New Cultivator (Part 2: Kinematic and Dynamic Analysis)
One of the main aims in the management of farm equipment and tractors is deciding about their rep... more One of the main aims in the management of farm equipment and tractors is deciding about their replacement, based on technical and economic conditions. The objective of this research was to determine the economic life time for common used tractor in Varamin region, Iran, namely Massey- Fergusen 285. First the annual depreciation and interest were calculated considering the initial purchase price of tractor, and then the economic life was calculated based on repair and maintenance costs. The results showed that the most suitable replacement age is nine years for Massey- Fergusen 285. (Hossein Ahmadi Chenarbon, Saeid Minaei, Akbar Arabhosseini. Replacement age of agricultural tractor (MF285) in Varamin region (case study). Journal of American Science 2011; 7(2):674-679). (ISSN: 1545-1003). http://www.americanscience.org
Drying kinetics of Zataria multiflora (Avishan) leaves - intelligent and superposition modelling techniques
Determining The specific energy Consumption for Grinding Rice straw with a Hammer mill
The objective of this study was determining the relationships between moisture content (8 and 12 ... more The objective of this study was determining the relationships between moisture content (8 and 12 % w.b) and hammer mill in four screen sizes (2, 4, 7 and 8 mm) with energy required for grinding rice straw. An amount of rice straw was grinded in each test and the particle size of grinded rice straw was determined. A watt metering system was used to measure the energy consumption of grinding of grinding for each test. The highest specific energy consumption was 32.46kWh.t -1 for hammer mill screen size of 2mm at 12 % (w.b) moisture content. The hammer mill screen size was negatively connected with specific energy consumption. Therefore, the larger the hammer mill screen size, use less the specific energy consumption. The particle size was normally distributed for the rice straw grinded by at 2 and 4 mm hammer mill screen sizes. The grinds from screen size of 8 mm had a large size distribution with a geometric mean particle diameter of 1.04 mm.
Drying characteristics of Estragon (Artemisia dracunculus L.)
Taxon, 2004
The effect of husking and whitening machines on rice, Daillman Mazandarani (DM) cultivar was stud... more The effect of husking and whitening machines on rice, Daillman Mazandarani (DM) cultivar was studied based on some technical indicators. Two types of machines (Satake and Yanmar) were tested at three clearances of 0.4, 0.6 and 0.8 mm between cylinders and three ranges of grain moistures of 10%-12%, 12%-14% and 14%-16%. The experiments were carried out in a factorial experiment under complete randomized design with three replications. The results showed that the Satake machine was significantly better than the Yanmar machine in all studied conditions. The results showed a production process of 1.525 and 1.300 t\h, power consumption of 14.972 and 15.601 kW, milling recovery of 69.257% and 68.369%, broken rice of 7.343% and 8.232%, husking efficiency of 83.212% and 81.703% and head rice yield of 68.750% and 66.905% for Satake and Yanmar machines, respectively. The clearance 0.8 was significantly superior to the other two levels of 0.4 and 0.6 mm while the moisture content of grain at r...
Agricultural Engineering International: The CIGR Journal, 2013
T hin layer drying of tomato slices was evaluated using a laboratory solar dryer. The experiment... more T hin layer drying of tomato slices was evaluated using a laboratory solar dryer. The experimental moisture ratios of the samples were fitted to nine drying models. The drying experiments were carried out on tomato slices with thicknesses of 3, 5 and 7 mm at the air velocities of 0.5 and 1 m s -1 . The effect of drying thickness and air velocity on the drying time was evaluated. The mathematical models were tested with the drying behavior of tomato slices in the laboratory solar dryer. The coefficients of the models were determined by multiple regression method in three spaces (solar dryer, shadow, open sun drying) to find out the most suitable moisture ratio model. The Page model was found as the best model based on statistical parameters of R 2 , RMSE and χ 2 . The Page model is applicable to predict moisture content of tomato slices during solar drying of tomato slices. Keywords: p edal operated thresher, t hresher, t hresher drive linkage, p hysiological workload
Effect of drying with traditional and hot air method on the amount of total alkaloid in the the atropa belladonna l
Atropa Belladonna L. is a valuable medicinal plant, which is highly important due to its alkaloid... more Atropa Belladonna L. is a valuable medicinal plant, which is highly important due to its alkaloids in the pharmaceutical industry. One of the most important uses of this plant is in manufacturing of anesthetic drugs due to its effects on the nervous system. The drying process of the plant (Atropa belladonna L.) leaves was evaluated with the traditional (sun drying) and hot air drying methods due to the effect of drying process on the quality of the active ingredients of medicinal plants. In order to investigate the effect of drying methods on the amount of total alkaloid in the leaves, a completely randomized design with three replications was designed in which the amount of total alkaloid was examined for the leaves, dried with traditional method as well as the hot air drying method at two temperature levels of 60 and 80 °C. The results showed that there was a significant difference between treatments (p<0.01). The highest and the lowest levels of the total alkaloid were observe...
Selection of the best model for some physical properties of garlic (Allium sativum)
Sorption isotherms of tarragon (Artemisia dracunculus L.)
Drying is one of the most important post harvest processes which convert decaying products to res... more Drying is one of the most important post harvest processes which convert decaying products to resistant preparations so that it increases the storage duration and keeping product quality (food stuff shelflife). Hypericum perforatum L. is an important kind of herbs which its Iranian species characterized by high percentage of Hyperisin as the most important substance of its leaves and flowers. It has an important role in curing some of diseases. In this research, the energy consumption and special required energy for drying of Hypericum perforatum L. were investigated by using hot air drying method. The experiments were done at four levels of the temperature (40, 50, 60 and 70°C), air velocity at three levels (0.3, 0.7 and 1 m/s) and bed depth at three levels (1, 2 and 3 cm) on factorial experiment design based on completely randomized design with three replications. Based on results with increasing of temperature, air velocity and bed depth, energy consumption was increased. On the ...
Desorption isotherms of miscanthus (Miscanthus × giganthus)
Determination of Moisture Adsorption Isotherm of St. John’s Wort (Hypericum Perforatum L.) Leaves
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Papers by Akbar Arabhosseini