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Askari M.,Behbahan Higher Educational Complex | Taghizadeh M.,Islamic Azad University at Behbahan
European Journal of Scientific Research | Year: 2011

One of the emerging technologies that being investigated as an alternative to CMOS VLSI is Quantum-Dot Cellular Automata (QCA). Its advantages such as faster speed, smaller size, and lower energy consumption are very good-looking. Unlike conventional digital circuits in which information is transferred using electrical current, QCA transfers information by propagate a polarization state. This paper proposes a detailed design analysis of combinational and sequential logic circuits for quantum-dot cellular automata. The aim is to maximize the circuit density and focus on a layout that is minimal in its use of cells.


Motaghed S.,Behbahan Higher Educational Complex
European Journal of Scientific Research | Year: 2011

The variations of structural parameters and random nature of seismic excitations, made quantitative evaluation of structure damageability, for future earthquakes quite difficult. The concrete compression strength is one of the uncertainty factors affecting structural response during strong ground motions (considering the broad acceptance range of concrete of ACI Code). This paper focuses on probabilistic evaluation of the concrete compression strength in the Code limitations (acceptance, rejection or⋯) on reinforced concrete structure damage index. One hundred models from the total probabilities (generate from six types concrete) have been selected by Monte Carlo simulation method. Then these building structures were modeled and their damage indices calculated using IDARC software. After that the effect of concrete strength on structure damage condition was calculated by statistical methods (e.g. maximum likelihood method). The results showed that the concrete compression strength variations in implementation limits do not have any significant effects on damageability. Deterministic modeling in the Code acceptance ranges is sufficient. © EuroJournals Publishing, Inc. 2011.


Askari M.,Behbahan Higher Educational Complex
European Journal of Scientific Research | Year: 2011

In Wideband Code Division Multiple Access, Channelization codes are used to preserve the orthogonality between physical channels, in order to increasing system capacity. The Orthogonal Variable Spreading Factor (OVSF) codes are used as the channelization codes in this system. In WCDMA, it is possible to provide multi-rate service by employing the OVSF codes, which can be generated in the form of tree structure. This scheme is known as OVSF-CDMA. One important limitation of OVSF-CDMA is that the system must maintain the orthogonality among the assigned codes. The maintenance of the orthogonality among the assigned OVSF codes causes the code blocking problem. Efficient channelization code management, result in high efficiency of code utilization and increasing system capacity. This research compares the performance of static and dynamic OVSF code assignment schemes, in terms of call blocking probability and number of required call reassignment. © EuroJournals Publishing, Inc. 2011.


Motaghed S.,Behbahan Higher Educational Complex
European Journal of Scientific Research | Year: 2011

Structural condition assessment under seismic loading has always been the matter of investigation. Indices such as damage index, reliability index and fragility with the same meaning have already been defined. The present paper aims to evaluate the effect of design parameter on structure damageability. The design parameter under consideration is the percent of longitudinal reinforcement. Seven reinforced concrete frames with three story and three spans have been designed according to ACI 318-05 code. The damage index and hysteresis characteristics (pinching, stiffness degradation, and strength degradation) calculated through IDARC program. Finally regarding damage indices and hysteresis characteristics for beams, columns and frames, the optimal percent of longitudinal reinforcement were suggested separately. © EuroJournals Publishing, Inc. 2011.


Naghdi R.,Guilan University | Bagheri I.,Guilan University | Basiri R.,Behbahan Higher Educational Complex
Journal of Forestry Research | Year: 2010

A study was conducted to investigate the effects of skid trail slope and traffic levels on soil disturbances at two soil depths (0-10 and 10-20 cm). The treatments were set at four traffic levels (2, 7, 12 and 20), two slope classes (<20% and >20%) and two soil depths (0-10 and 10-20 cm). Results show that skidder traffic, longitudinal slope and soil depth have significant effect on soil bulk density in skid trail. Comparison of average soil bulk density in different traffic levels shows that there are significant differences in average bulk density between different traffic levels and control (p<0.05). The average bulk densities in different slopes and soil depths are significantly increased with increase in traffic levels, maximized at 12 passes (p<0.05), but there are no significant differences between 12 and 20 passes. The interaction effects between traffic and soil depth are significant (F 0.05,3=0.109, p<0.001). For all traffic treatments, there are significant differences in soil moisture content between the two slope classes and the two depths (p<0.001). However, the interaction effects between traffic levels and slope classes are not significant (p >0.05), although skidder traffic and slope affected soil moisture content. © 2010 Northeast Forestry University and Springer-Verlag Berlin Heidelberg.

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