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156 results for “Validity”
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Research ArticleOpen accessIn the abstractValidation of the Calculation and Measurement Techniques of Earth Resistance ValuesN. Mohamad Nor, R. Rajab, K. RamarMuch research has been published in the literature on the mathematical approaches to obtain the most accurate earth resistance and resistivity values. However, the published research only conducted the comparisons among the mathematical/computational techniques and so far none has conducted validation tests of these mathematical/computational methods against the real earth resistance measurement at real field sites. Thus, the main contribution … …American Journal of Applied Sciences, Vol. 5, Issue 10 · 31 Oct 2008 · 7,214 accessesView PDFCite
Research ArticleOpen accessIn the abstractInvestigating Mechanisms of Marginal Settlement Life ImprovementHamid Movahed Mohammadi, Yaser Mohammadi, Mehdi Rahimian, Navid LoghmaniThe main purpose of this research was to investigate mechanisms to improve marginal settlement life in Koohdasht County in Lorestan province. This research was a sort of the survey studies and a questionnaire was compiled for collection of data. Statistical population of this study was included 1560 households; also sampling method was a sort of random sampling. Number of sample … …Journal of Social Sciences, Vol. 4, Issue 3 · 30 Sep 2008 · 7,710 accessesView PDFCite
Research ArticleOpen accessIn the abstractAnalytical Solution of Nonlinear Vibrating SystemsN. Tolou, I. Khatam, B. Jafari, D. D. GanjiThe responses of nonlinear vibrating systems are investigated analytically using Homotopy Perturbation Method (HPM). To demonstrate the validity of the proposed method, the results obtained by HPM have been depicted graphically and have been compared with those of the exact solution. A clear conclusion can draw from the numerical results that the method provides highly accurate solutions to the discussed … …American Journal of Applied Sciences, Vol. 5, Issue 9 · 30 Sep 2008 · 7,149 accessesView PDFCite
Research ArticleOpen accessIn the abstractPower Quality Improvement Using a Sliding Mode Control of a Series Active FilterTheerayuth ChatchanayuenyongA sliding mode controller (SMC) for a three-phase series active filter was proposed to compensate voltage unbalances, suppress voltage sags and swells and hence improve the power quality of a three-phase ac system. The voltage unbalance compensation and regulation is only based on the positive sequence component decomposition of the supply voltage that is then adjusted to a rated value … …American Journal of Applied Sciences, Vol. 5, Issue 8 · 31 Aug 2008 · 6,584 accessesView PDFCite
Research ArticleOpen accessIn the abstractDesign of Robust UPFC Controller Using H∞ Control Theory in Electric Power SystemSeyed Abbas Taher, Shahabeddin Akbari, Ali Abdolalipour, Reza HemattiAn industrial plant, such a power system, always contains parametric uncertainties. In the design of a controller the uncertainties have to be considered. Otherwise, if the real plant differs from the assumed plant model, a controller, designed based on classical controller design approaches, may not ensure the stability of the overall system. In this paper design of robust control for … …American Journal of Applied Sciences, Vol. 5, Issue 8 · 31 Aug 2008 · 7,090 accessesView PDFCite
Research ArticleOpen accessIn the abstractAn Aggregation Approach for Group Multicriteria AssignmentGeorge Rigopoulos, John Psarras, Dimitrios Th. AskounisWe presented an aggregation approach for group multicriteria assignment decisions, where group members express their preferences on problem parameters in numeric format. Individual preferences are aggregated by WOWA operator following the majority concept and a group parameter set is derived that is used as input for the classification algorithm. In addition, we present a numeric example of the approach, demonstrating … …American Journal of Applied Sciences, Vol. 5, Issue 8 · 31 Aug 2008 · 6,548 accessesView PDFCite
Research ArticleOpen accessIn the abstractEffects of Creative, Educational Drama Activities on Developing Oral Skills in Primary School ChildrenAbdulhak Halim Ula&#351A research study was carried out to determine whether native language teaching courses that utilize creative drama activities are more efficient in developing oral communication skills in primary school students than the traditionally applied native language teaching courses. In the present research, the elements of oral communication skills of primary school students were investigated in terms of pronunciation and interpretation … …American Journal of Applied Sciences, Vol. 5, Issue 7 · 31 Jul 2008 · 9,349 accessesView PDFCite
Research ArticleOpen accessIn the abstractRobust Decentralized Load Frequency Control Using Multi Variable QFT Method in Deregulated Power SystemsSeyed Abbas Taher, Reza HemattiThe Load Frequency Control problem has been a major subject in electrical power system design/operation and is becoming more significant recently with increasing size, changing structure and complexity in interconnected power systems. In practice LFC systems use simple proportional-integral controllers. However, since the PI control parameters are usually tuned based on classical or trial-and-error approaches, they are incapable of obtaining … …American Journal of Applied Sciences, Vol. 5, Issue 7 · 31 Jul 2008 · 7,088 accessesView PDFCite
Research ArticleOpen accessIn the abstractAnalysis of Factors Influencing Rural People's Participation in National Action Plan for Sustainable Management of Land and Water Resources in Hable-Rud Basin, IranElham Faham, Seyed Mahmood Hosseini, Amir Keivan DarvishThe purpose of this study was to analyze factors influencing rural people's participation in National Action Plan for Sustainable Management of Land and Water Resources (NAP-SMLWR) in Hable-Rud Basin. This study is a case study of Arou village in northern Hable-Rud basin. The statistical population includes head of households who dwelling in Arou village and participate in this project. Available … …American Journal of Agricultural and Biological Sciences, Vol. 3, Issue 2 · 30 Jun 2008 · 8,248 accessesView PDFCite
Research ArticleOpen accessIn the abstractDecentralized Controller Design for Static Synchronous Compensator Using Robust Quantitative Feedback Theory MethodSeyed Abbas Taher, Reza Hematti, Ali Abdolalipour, Majid NematiThe Static Synchronous Compensator (STATCOM) provides shunt compensation in similar way to the Static VAR Compensator (SVC) but utilizes a voltage source converter rather than capacitors and reactor. In practice systems use simple Proportional-Integral (PI) controllers for control of STATCOM. However, since the PI control parameters were usually tuned based on classical or trial-and-error approaches, they were incapable of obtaining … …American Journal of Engineering and Applied Sciences, Vol. 1, Issue 1 · 31 Mar 2008 · 7,459 accessesView PDFCite