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Articles by Ali Mohammadi
Total Records ( 6 ) for Ali Mohammadi
  Ali Mohammadi , Ali Naghi Mosleh Shirazi , Ahmad Taleb Nejad , Ahmad Sadraei Javaheri and Ehsan Javanmardi
  The main idea of this study is to provide a conceptual model of a game in conditions of oligopoly based on feedback loops and system dynamics approach and explore the dynamics prevailing in a game in the real world and solve problems that conventional methods of game theory cant study them. During this study attempt to compare the complex method of game theory and system dynamics to explore the possibility of using the combination method of these two to consider oligopoly markets. The search method of problem is the combination of qualitative methods include using interviews with industry experts to prepare the models and quantitative methods of system dynamics, methodologies and simulation and methods of solving game theory search innovation consisted of representing a model in which considering the impact of behavior of the players on the environment and vice versa, also checking. The transition period a game in oligopoly and taking into account lag of information can be observed.
  Ali Naghi Mosleh Shirazi , Ali Mohammadi , Habibollah Ranaei and Hamid Honarparvaran
  In the recent years, developments in the field of information and telecommunication are pursued by major changes in different areas of human life. Human has constantly employed the technology and track record of human life is abundant with innovation in Information and Communication Technologies (ICT) which are called as new or high-technology. Therefore, Information and communication technology Development Indices (IDI) are remarkably important. This research purports to design a model of System Dynamics (SD) on the policy of upgrading indices of Iran ICT network. Accordingly, after investigating the IDI and mining the indices, the causal loops and flow chart are depicted through using the SD (System Dynamics). The results of simulation show that, the behavior of studied key variables, after performing enhancing economic growth policies, improved the quality and quantity of ICT infrastructure, social indices, the culture of employing ICT and the technical knowledge of ICT operators and the enhancing process has accelerated.
  Hamzeh Fathollahzadeh , Hossein Mobli , Ali Jafari , Shahin Rafiee and Ali Mohammadi
  Physical properties of apricot kernel are necessary for the design of equipments for processing, transportation, sorting and separating. In this paper the physical properties of apricot kernel have been evaluated as a function of moisture content varying from 3.19% to 17.46% (w.b.). With increasing in moisture content, kernel length, width, thickness, Geometric mean diameter and surface area increased; the sphericity varying from 59.79 % to 62.21%; mass, thousand grain mass, volume and true density increase from 0.380 to 0.448 (gr), 381.6 to 447.9 (gr), 0.442 to 0.463 (cm3) and 882.588 to 983.383 (kg/m3) respectively; The porosity and bulk density decreased from 52.68% to 51.33% and 471.6 to 406.8 (kg/m3) respectively; the coefficient of static friction on all surfaces increased as the moisture content increased; and the rupture strength in weakest direction (through length) decrease from 23.443 to 16.620 (N).
  Ali Mohammadi , Shahin Rafiee , Alireza Keyhani and Zahra Emam - Djomeh
  Drying behavior of kiwifruit slice was studied at 40, 50, 60, 70 and 80oC and at a constant air velocity of 1.5 m/s for constant sample thickness of 4 mm in a thin layer dryer. Sample weight, temperature and drying air velocity were measured during drying and drying curves were obtained for each experimental data. The curves were fitted to twelve different semi-theoretical and/or empirical thin-layer drying models to estimate a suitable model for drying of kiwifruit. Coefficients were evaluated by non-linear regression analysis. The models were compared based on their coefficient of determination (EF), root mean square error (RMSE) and reduced chi-square (x2). Midilli model had the highest value of EF (0.999319), the lowest RMSE (0.032536) and x2 (0.001119). The Midilli model was found to satisfactorily describe the drying behavior of kiwifruit.
  Mohammad Javad Heidari Khorasani , Mohsen Malek Afzali Ar-Dakani , Abdolah Omidi Fard , Mohammad Nouzari Ferdosieh , Alireza Ibrahimi and Ali Mohammadi
  This research aims to study juridical and legal basics of Islam about environment protection with descriptive and analytical method. In order to determine Islam’s view about the environment, basic issues like: position of human among creatures, relationship of human with nature and extent of human action were studied. Results of this research show that for solving environmental problem, following actions are necessary: reforming the thought which is possible through common education, books and environmental associations; resistance and fortitude which achieves through international and regional laws with guarantee; spirituality which forms by this belief that nature is one of the divine signs and human is obliged to obey the divine commands; enacting regulations and encountering with criminals and environment whether common or charity its destruction and personal use of it brings liability, Islamic government is obliged to punish the aggressors with regulations. Values, ethical, juridical and legal basics in Islam are studied in this research and reached to this result that Islam provided theoretical and practical solutions for presenting a comprehensive and suitable program in order to protect the environment and prevent irregular use of natural resources.
  Behnoosh Bakhtiari Heleyleh , Abdolrazzagh Kaabi Nejadian , Ali Mohammadi and Mashhood Mashhoodi
  Solar desiccant cooling cycle in combined mode with vapor compression refrigeration cycle in hot and humid weather of bushehr city was simulated. The main purpose of introducing the cycle was to reduce energy consumption, especially fossil fuel consumption, in vapor compression systems which are commonly used in buildings. To simulate the cooling cycle, a proper thermodynamic models and physical properties for each components of the system must adopted. A model for liquid desiccant system simulation was selected and coding was done in ESS based on experimental relations was used. The effects of regeneration temperature, thermal comfort condition and outdoor weather conditions such as air humidity were examined. In addition, in order to reduce further fossil fuel consumption in vapor compression cycle, the organic Rankine cycle was combined with vapor compression cycle so that required inlet work for compressor was supplied. Solar energy was adopted as the main required heat source for operation of organic Rankine cycle given the geographic potential of the area. A model of the solar system was simulated in TRNSYS and optimum values for all elements of the solar system were obtained based on Solar Fraction. Dynamic performance of the cycle in Bushehr city was analyzed in an area of 1000 m2 and with cooling capacity 50TR. The effects of significant parameters on the COP of the cycles, air outlet temperature and rate of energy consumption in the compressor were investigated along with the effect of outdoor condition on reaching thermal comfort. Results indicated that using solar energy with combined cooling system (vapor compression and liquid desiccant) cuts fossil fuel consumption about 50%. In addition, outcomes demonstrated that removing moisture from supply air by using a dehumidifier section in desiccant section of proposed cycle leads to 13% reduction in building cooling load in summer.
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