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Tehran, Iran

Kharazmi University is considered as the oldest institution of higher education in Iran named after Khwarizmi , Persian mathematician, astronomer and geographer. Kharazmi University is a major institution of higher education, offering a wide range of undergraduate and postgraduate programs in a variety of disciplines. It was established in 1919 as the Central Teachers' Institute and over a series of developments, finally gained university status as Tarbiat Moallem University of Tehran in 1974. It changed its name to Kharazmi University in 2010.Today the university is one of the largest in Iran with faculties of Science, Engineering, Mathematical & Computer science, Persian Literature and Humanities, Psychology & Education, Physical Education & Sport science and Chemistry. The university has two campuses,the main campus in the Hesarak area of Karaj and one in central Tehran . The current president of the university is Dr. Mohammad Ali Sobhanallahi. Wikipedia.

Molecular dynamics simulation has been performed to obtain pressure, radial distribution function, and self-diffusion coefficient of fluid methane using one site OPLS (optimized potentials for liquid simulations), five sites OPLS-SITE, and two-body HFD (Hartree-Fock dispersion)-like potentials. To take higher-body forces into account, three-body potential of Hauschild and Prausnitz (1993) has been used with the two-body HFD-like potential. The significance of this work is that the three-body potential of Hauschild and Prausnitz extended as a function of density and temperature and used with the HFD-like potential to improve the prediction of the results of pressure of fluid methane without requiring an expensive three-body calculation. The molecular dynamics simulation of methane has been also used to determine a new equation of state. The results are in a good agreement with experimental and theoretical values. © 2011 Elsevier B.V. Source

The Noakoh anticline is located in Kermanshah province and is part of the Simply Folded Belt of Zagros. Boundaries of 97 triangular facets and 67 wine-glass (W-G) valleys, which formed on anticline limbs, were delineated using Quickbird satellite imagery. The strata dip (D), area (A), base length (BL), topographic slope (S) of facets, the maximum width (M), outlet width (O) and ratio of maximum width to outlet width (W index) of W-G valleys were analysed in detail. Noakoh anticline was subdivided into 9 tectonic zones on the basis of dip, topographic slopes and width of limbs. Results show that there are strong positive correlations between means of D-BL and S-BL pairs. Poor positive correlations exist between means of D-A and S-A pairs. Among W-G valley metrics, the W index has strong relations with D and S parameters. Based on the results, steep facets with long bases and well developed W-G valleys with narrow outlets and wide upper parts are associated with more rotated limbs having steep slopes. Facets on the northeastern slope have more forest cover, micro-organism activity, karstic features and soil cover, whereas facets on relatively drier southwestern slope are characterized by physical weathering processes and minor karstic landforms. This study demonstrates that, apart from tectonic activity as a major control on the morphometry of facets and valleys, climate and slope aspect have also acted as secondary factors on the development of the studied landforms. © 2012 Elsevier B.V. Source

Fathabadi H.,Kharazmi University
Energy Conversion and Management

In this paper, a novel method is proposed to determine the characteristics of silicon solar cell, module and plastic solar cell. Feed-forward artificial neural network together with Lambert W function are used to determine the characteristics. The current-voltage (I-V) and power-voltage (P-V) curves of silicon/plastic solar cells and module are determined. Five model parameters of the solar cell and module are calculated using the proposed technique which compares the Lambert W function representation of the current-voltage characteristic with the learned feed-forward neural network model of the current-voltage relation. Simulation results show a very good agreement between the calculated characteristic curves and experimental data. Also errors are calculated to evaluate the accuracy of the proposed method. The accuracy of the proposed method is compared with other related methods to validate the superiority of the proposed method. As will be shown, the novel contributions of the proposed method can be summarized as: firstly, the proposed method has the accuracy which is much better than other methods and secondly, the current and power errors in the proposed method are generally very lower than these errors in other methods even at the Maximum Power Point (MPP). © 2013 Elsevier Ltd. All rights reserved. Source

Very recently, Tu et al. proposed an authentication scheme for session initiation protocol using smart card to overcome the security flaws of Zhang et al.’s protocol. They claimed that their protocol is secure against known security attacks. However, in this paper, we indicate that Tu et al.’s protocol is insecure against impersonation attack. We show that an adversary can easily masquerade as a legal server to fool users. As a remedy, we also improve Tu et al.’s protocol without imposing extra computation cost. To show the security of our protocol, we prove its security in the random oracle model. © 2014, Springer Science+Business Media New York. Source

In this study, a novel Li-ion battery pack design including hybrid active-passive thermal management system is presented. The battery pack is suitable for using in hybrid/electric vehicles. Active part of the hybrid thermal management system uses distributed thin ducts, air flow and natural convection as cooling media while the passive part utilizes phase change material/expanded graphite composite (PCM/EG) as cooling/heating component to optimize the thermal performance of the proposed battery pack. High melting enthalpy of PCM/EG composite together with melting of PCM/EG composite at the temperature of 58.9°C remains the temperature distribution of the battery units in the desired temperature range (below 60°C). The temperature and voltage distributions in the proposed battery pack design consisting of battery units, distributed thin ducts and PCM/EG composite are calculated by numerical solving of the related partial differential equations. Simulation results obtained by writing M-files code in Matlab environment and plotting the numerical data are presented to validate the theoretical results. A comparison between the thermal and physical characteristics of the proposed battery pack and other latest works is presented that explicitly proves the battery pack performance. © 2014 Elsevier Ltd. Source

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