Abolfazl Khalkhali

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This article aims to study the relationship of organizational citizenship behavior (its components based on comments of organ) and performance of teachers has been done. This research is a description of coefficient. It is a research society of western part of Mazandaran. Sample size is based on Cohen diagram and his colleagues using classified random(More)
In the present study, multi-objective optimization of 4-digit NACA airfoils is performed at three steps. At the first step, lift (CL) and drag (CD) coefficient in a set of 4-digit NACA airfoils are numerically investigated using commercial software NUMECA. Two meta-models based on the evolved Group Method of Data Handling (GMDH) type neural networks are(More)
BACKGROUND Acetaminophen exposure might be associated with increasing risk of asthma prevalence and other atopic disorders over recent decades. The present study aimed to investigate the association between acetaminophen exposure and the risk of developing childhood asthma. METHODS A case - control study was undertaken between March and September 2010 in(More)
In the present study, multi-objective optimization of Forward-Curved (FC) blade centrifugal fans is performed in three steps. In the first step, Head rise (HR) and the Head loss (HL) in a set of FC centrifugal fan is numerically investigated using commercial software NUMECA. Two meta-models based on the evolved group method of data handling (GMDH) type(More)
Modeling and multi-objective optimization of centrifugal pumps is performed at three steps. At the first step, η and NPSHr in a set of centrifugal pump are numerically investigated using commercial software NUMECA. Two metamodels based on the evolved group method of data handling (GMDH) type neural networks are obtained, at the second step, for modeling of(More)
The major goal of this study is to “assessing and the comparison ICT’ literacy between teachers and students in Iran’s secondary schools”. A group sample of teachers, 367 and a group sample of students, 390, was selected through simple random sampling method. The research method was survey method. To study goals of the research, two instruments,(More)
Increasing of head rise (HR) and decreasing of head loss (HL), simultaneously, are important purpose in the design of different types of fans. Therefore, multi-objective optimization process is more applicable for the design of such turbo machines. In the present study, multi-objective optimization of Forward-Curved (FC) blades centrifugal fans is performed(More)
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