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Search Results: 1 - 10 of 462089 matches for " A. Safari "
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Optimal Design of STATCOM Based OFD Controller using Quantum Particle Swarm Optimization
A. Safari,E. Mazloumi
Research Journal of Applied Sciences, Engineering and Technology , 2012,
Abstract: This study present the optimal design of OFD (OFD) controller for static synchronous compensator (STATCOM) connected to a power system, in order to increase the damping of low frequency electromechanical oscillations. The design process is converted to an optimization problem with the time domain-based objective function which is solved by a Quantum-behaved Particle Swarm Optimization (QPSO) technique that has fewer parameters and stronger search capability than the Classical Particle Swarm Optimization (CPSO), as well as is easy to implement. To guarantee the robust performance of the OFD controller, the design process takes into account a wide range of operating conditions and system configurations. The simulation results demonstrate the effectiveness of proposed controller in comparison with designed Classical PSO (CPSO) based STATCOM controller.
Analytical Solution of Two Extended Model Equations for Shallow Water Waves by He’s Variational Iteration Method  [PDF]
Mehdi Safari, Majid Safari
American Journal of Computational Mathematics (AJCM) , 2011, DOI: 10.4236/ajcm.2011.14027
Abstract: In this paper, we consider two extended model equations for shallow water waves. We use He’s variational iteration method (VIM) to solve them. It is proved that this method is a very good tool for shallow water wave equations and the obtained solutions are shown graphically.
The effects of CaCO3 on adsorption, immobilization and activity of cellulase in a decarbonated soil
Safari-Sinegani,A.A; Safari-Sinegani,M;
Journal of soil science and plant nutrition , 2011, DOI: 10.4067/S0718-95162011000300008
Abstract: the interaction of organic molecules with mineral surfaces is a subject of interest in a variety of disciplines. the present study was done to elucidate some aspects of sorption and immobilization of cellulase on soil components by analysis of the sorption, desorption, immobilization and activity of cellulase on a decarbonated soil treated with different levels of caco3 (0, 2.5, 10 and 20 %). applied concentrations of cellulase protein on ca-homoionized soil suspensions were 0, 0.014, 0.028, 0.070, 0.140, 0.280, 0.701, 0.981 and 1.402 mg ml-1. after shaking for 1 h in sterile conditions, they were centrifuged and the amount of the cellulase protein remaining in solution was determined. the adsorbed cellulase protein was calculated. the immobilized and desorbed cellulase proteins were calculated after washing soil suspensions thrice with distilled water. analysis of variance showed that the effects of the enzyme concentration, caco3 level and their interaction on cellulase protein adsorption and activity were statistically significant. the adsorption and immobilization capacities of the decarbonated soil increased by application of caco3. however, these effects of caco3 were only significant when high concentrations of cellulase protein were added to the soil. the desorption of cellulase protein from the decarbonated soil did not depend on the amount of cellulase adsorbed on the soil and the caco3 level in the soil. the immobilized cellulase activity, and particularly its specific activity, decreased considerably by increasing caco3 levels in the soil. this negative effect of caco3 on the cellulase specific activity in the decarbonated soil was significant even for low levels.
The effects of CaCO3 on adsorption, immobilization and activity of cellulase in a decarbonated soil
A.A Safari-Sinegani,M Safari-Sinegani
Journal of Soil Science and Plant Nutrition , 2011,
Abstract: The interaction of organic molecules with mineral surfaces is a subject of interest in a variety of disciplines. The present study was done to elucidate some aspects of sorption and immobilization of cellulase on soil components by analysis of the sorption, desorption, immobilization and activity of cellulase on a decarbonated soil treated with different levels of CaCO3 (0, 2.5, 10 and 20 %). Applied concentrations of cellulase protein on Ca-homoionized soil suspensions were 0, 0.014, 0.028, 0.070, 0.140, 0.280, 0.701, 0.981 and 1.402 mg mL-1. After shaking for 1 h in sterile conditions, they were centrifuged and the amount of the cellulase protein remaining in solution was determined. The adsorbed cellulase protein was calculated. The immobilized and desorbed cellulase proteins were calculated after washing soil suspensions thrice with distilled water. Analysis of variance showed that the effects of the enzyme concentration, CaCO3 level and their interaction on cellulase protein adsorption and activity were statistically significant. The adsorption and immobilization capacities of the decarbonated soil increased by application of CaCO3. However, these effects of CaCO3 were only significant when high concentrations of cellulase protein were added to the soil. The desorption of cellulase protein from the decarbonated soil did not depend on the amount of cellulase adsorbed on the soil and the CaCO3 level in the soil. The immobilized cellulase activity, and particularly its specific activity, decreased considerably by increasing CaCO3 levels in the soil. This negative effect of CaCO3 on the cellulase specific activity in the decarbonated soil was significant even for low levels.
Application of He’s Variational Iteration Method and Adomian Decomposition Method to Solution for the Fifth Order Caudrey-Dodd-Gibbon (CDG) Equation  [PDF]
Mehdi Safari
Applied Mathematics (AM) , 2011, DOI: 10.4236/am.2011.28131
Abstract: In this work we use the He’s variational iteration method and Adomian decomposition method to solution N-soliton solutions for the fifth order Caudrey-Dodd-Gibbon (CDG) Equation.
Analytical Solution of Two Extended Model Equations for Shallow Water Waves By Adomian’S Decomposition Method  [PDF]
Mehdi. Safari
Advances in Pure Mathematics (APM) , 2011, DOI: 10.4236/apm.2011.14042
Abstract: In this paper, we consider two extended model equations for shallow water waves. We use Adomian’s decomposition method (ADM) to solve them. It is proved that this method is a very good tool for shallow water wave equations and the obtained solutions are shown graphically.
Application of He’s Variational Iteration Method for the Analytical Solution of Space Fractional Diffusion Equation  [PDF]
Mehdi Safari
Applied Mathematics (AM) , 2011, DOI: 10.4236/am.2011.29150
Abstract: Spatially fractional order diffusion equations are generalizations of classical diffusion equations which are increasingly used in modeling practical super diffusive problems in fluid flow, finance and others areas of application. This paper presents the analytical solutions of the space fractional diffusion equations by variational iteration method (VIM). By using initial conditions, the explicit solutions of the equations have been presented in the closed form. Two examples, the first one is one-dimensional and the second one is two-dimensional fractional diffusion equation, are presented to show the application of the present techniques. The present method performs extremely well in terms of efficiency and simplicity.
Trend Analysis of the Mean Annual Temperature in Rwanda during the Last Fifty Two Years  [PDF]
Bonfils Safari
Journal of Environmental Protection (JEP) , 2012, DOI: 10.4236/jep.2012.36065
Abstract: Climate change and global warming are widely recognized as the most significant environmental dilemma the world is experiencing today. Recent studies have shown that the Earth’s surface air temperature has increased by 0.6°C - 0.8°C during the 20th century, along with changes in the hydrological cycle. This has alerted the international community and brought great interest to climate scientists leading to several studies on climate trend detection at various scales. This paper examines the long-term modification of the near surface air temperature in Rwanda. Time series of near surface air temperature data for the period ranging from 1958 to 2010 for five weather observatories were collected from the Rwanda National Meteorological Service. Variations and trends of annual mean temperature time series were examined. The cumulative sum charts (CUSUM) and bootstrapping and the sequential version of the Mann Kendall Rank Statistic were used for the detection of abrupt changes. Regression analysis was performed for the trends and the Mann-Kendall Rank Statistic Test was used for the examination of their significance. Statistically significant abrupt changes and trends have been detected. The major change point in the annual mean temperature occurred around 1977-1979. The analysis of the annual mean temperature showed for all observatories a not very significant cooling trend during the period ranging from 1958 to 1977-1979 while a significant warming trend was furthermore observed for the period after the 1977-1979 where Kigali, the Capital of Rwanda, presented the highest values of the slope (0.0455/year) with high value of coefficient of determination (R2 = 0.6798), the Kendall’s tau statistic (M-K = 0.62), the Kendall Score (S = 328) with a two-sided p-value far less than the confidence level α of 5%). This is most likely explained by the growing population and increasing urbanization and industrialization the country has experienced, especially the Capital City Kigali, during the last decades.
Numerical Investigation of the Effect of Process and Sheet Parameters on Bending Angle in the Laser Bending Process  [PDF]
Mehdi Safari
World Journal of Mechanics (WJM) , 2014, DOI: 10.4236/wjm.2014.44011
Abstract:

In this work, the effects of process parameters such as laser output power, beam diameter and scan speed and also sheet thickness on the bending angle have been numerically investigated in the laser bending process. For this purpose, Abaqus software is used for investigating the effect of various process and sheet parameters on the bending angle. The results show that with increasing the laser output power, bending angle is increased. Also, the bending angle is decreased with increasing the beam diameter, scan speed and sheet thickness.

An investigation on facial and cranial anthropometric parameters among Isfahan Young adults
Alavi Sh. Assistant Professor,Safari A. Dentist
Journal of Dental Medicine , 2003,
Abstract: Statement of Problem: Anthropometry is applied in medical professions such as maxillofacial surgery,"ngrowth and development studies, plastic surgery, bioengineering and non- medical branches such as like"nshoe- making and eye- glasses industries."nAim: The aim of the present study was to determine facial and cranial ratios among Isfahan young"nadults."nMaterials and Methods: A study was done randomly on 200 boys and 200 girls, from among Isfahan"nyoung adults, with normal face patterns. Facial and cranial ratios, according to sex, were estimated and"ncompared."nResults: The results of this study were compared with Canadian anthropometric findings by Farkas."nThere was no significant difference in cranial width between boys and girls but cranial length and all"nfacial parameters (Int ,cant, go-go, zy- zy, ch-ch, Ala-Ala, low.lip, Up.Iip, Sn.gn, Sto.gn, N.sto, Ngn)"nwere greater in boys than girls. Cranial index and , , " ,Cl ratios were greater in"nn - gn zy - zy zy - zy zy - zy"n... slo-go sn-gn sto-gn slo-gn sto-gn . . ._"ngirls, however, -, -, , , were greater in boys, There was no significant"ngo-go n- gn n- gn n- sto sn - gn"ndifference about facial index between boys and girls. Comparing facial parameters between Iranian and Canadian races, low. lip, Ala-Ala and go- go were greater among Iranians, however, Int cant ,Up. lip. N.gn, ch- ch, zy-zy showed a greater size among Canadians. Sn-gn ratio was greater in Canadian girls, but there was no significant difference between Iranian and Canadian boys in this"nregard. " " s" , s° " 8° , " ~ s ° , g° " 8° , ^-- ratios were greater among Isfahanian boys and girls,"nzy-zy zy-zy zy-zy n - gn zy-zy"nhowever, J ° ~ g" , 5 ° " 8" / ° " s" ratios were greater among Canadians. Regarding 5"~g" ratio, no"nn- sto sn- gn n~ gn n- gn"nsignificant difference was observed between Canadian and Isfahanian girls."nConclusion: Considering the significant difference in the facial and cranial anthropologic ratios and"nsizes, among Canadian and Isfahanian young adults, the results obtained from Canadian race, should not"nbe applied as a criteria for Iranian surgical and dental treatment plans. Due to the wide racial"ncombinations in Iran, more studies, with wider variations, should be conducted among different Iranian"nraces.
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