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Articles by A. Bagheri
Total Records ( 9 ) for A. Bagheri
  A. Bagheri , H. Shabanali Fami , A. Rezvanfar , A. Asadi and S. Yazdani
  Sustainable agriculture has defined and described in many ways. Despite the diversity in conceptualizing sustainable agriculture, there is a consensus on three basic dimensions of the concept, namely, ecological soundness economically viable and socially acceptable. The dimensions of ecological soundness refers to the preservation and improvement of the natural environment. Environmental issues emerge from the human use of natural resources. Farmers' decisions to adopt a new agricultural technology depend on complex factors. One of the factors is farmers' perception. The objective of this study was to investigate perceptions of paddy farmers towards applying sustainable agricultural technologies and to identify factors influencing their perceptions. The results of the study show that farmers had good perception about sustainable technologies such as diversification and rotation, application of manure but in general, they preferred modern technologies to local ones. They perceived agrochemicals as the best means to combat against pests and to increase rice production. Their perception of intangible impacts of modern technologies was weak. It was found that there should be a relationship between a numbers of socio-economic factors, such as human capital factors, information sources use, extension participation and landholding size and the perception towards selected sustainable agricultural technologies. Also, educational level, contact with agricultural experts and extension participation were best predictors of their perceptions.
  M. Zandieh , I. Mahdavi and A. Bagheri
  A meta-heuristic approach for solving the flexible job-shop scheduling problem (FJSP) is presented in this study. This problem consists of two sub-problems, the routing problem and the sequencing problem and is among the hardest combinatorial optimization problems. We propose a Genetic Algorithm (GA) for the FJSP. Our algorithm uses several different rules for generating the initial population and several strategies for producing new population for next generation. Proposed GA is tested on benchmark problems and with due attention to the results of other meta-heuristics in this field, the results of GA show that our algorithm is effective and comparable to the other algorithms.
  H. Midi , A. Bagheri and A.H.M.R. Imon
  In this study, we proposed Robust Variance Inflation Factors (RVIFs) in the detection of multicollinearity due to the high leverage points or extreme outliers in the X-direction. The computation of RVIFs is based on robust coefficient determinations which we called RR2 (MM) and RR2 (GM (DRGP)). The RR2 (MM) is coefficient determination of high breakdown point and efficient MM-estimators whereas RR2 (GM (DRGP)) has been defined through an improved GM-estimators. The GM (DRGP) is a GM-estimator with the main aim as downweighting high leverage points with large residuals. It has been introduced by employing S-estimators as initial values, Diagnostic Robust Generalized Potential based on MVE (DRGP (MVE)) as initial weight function and an Iteratively Reweighted Least Squares (IRLS) has been utilized as a convergence method. The numerical results and Monte Carlo simulation study indicate that the proposed RVIFs are very resistant to the high leverage points and unable to detect the multicollinearity in the data especially RR2 (GM (DRGP)). Hence, this indicates that the high leverage points are the source of multicollinearity.
  A. Bagheri , Habshah Midi and A.H.M.R. Imon
  In this study, the effect of different patterns of high leverages on the classical multicollinearity diagnostics and collinearity-influential measure is investigated. Specifically the investigation is focus on in which situations do these points become collinearity-enhancing or collinearity-reducing observations. Both the empirical and the Monte Carlo simulation results, in collinear data sets indicate that when high leverages exist in just one explanatory variable or when the values of the high leverages are in different positions of the two explanatory variables, these points will be collinearity-reducing observations. On the other hand, these high leverages are collinearity-enhancing observations when their values and positions are the same for the two collinear explanatory variables.
  Z.A. Lope Pihie and A. Bagheri
  As the influential factors affecting intention to become an entrepreneur, entrepreneurial attitude orientation and self-efficacy of students have been one of the main focuses of entrepreneurship research. However, there is not enough information on secondary school students’ attitude toward and efficacy of entrepreneurship particularly, in Malaysia. Through a descriptive approach, this study aimed to determine entrepreneurial attitude and entrepreneurial self-efficacy in order to evaluate the entrepreneurship inclination and potential among Malaysian secondary school students. A sample of 2,574 students was randomly selected from three states around Malaysia as the participants of this study. A set of questionnaire was developed based on previous researches to measure students’ entrepreneurial attitude and self-efficacy. The findings indicate that Malay students have a moderately high attitude toward entrepreneurship. More specifically, the students scored high in self-esteem cognition and achievement cognition but low in self-esteem behavior and self-esteem affect. Moreover, the students perceived themselves as moderately capable of establishing new ventures. The implication of the findings and areas for future researches are discussed.
  Z.A. Lope Pihie and A. Bagheri
  Recent research on the impacts of entrepreneurship education revealed that graduates lack the motivation and competencies required for new venture creation. Students’ entrepreneurial motivation and competencies can be highly influenced by teachers’ attitude toward and self-efficacy in entrepreneurship. However, there is little knowledge about entrepreneurial attitude and self-efficacy of teachers specifically at vocational and technical schools. This study aimed to examine entrepreneurial attitude and self-efficacy among 315 teachers from technical and vocational secondary schools in Malaysia. It employed a survey research method and a set of questionnaire to measure the teachers' entrepreneurial attitude and self-efficacy. Analysis of the data indicated that the teachers had attitudes as consistent with entrepreneurs and a high entrepreneurial self-efficacy. More specifically, the teachers scored high in all dimensions of entrepreneurial attitude except self-esteem affect and behavior, personal control affect, personal control cognition and innovation behavior. Therefore, the teachers have a positive attitude towards entrepreneurship and a high sense of self-efficacy.
  A. Bagheri and O. Sadeghipour
  In order to evaluate the effects of salinity on some traits of barley, Four hullless barley (Hordeum vulgare L.) cultivars (Namely, UH3, UHM7, EHM81-12 and CM67) were grown in research station of Islamic Azad University of Eghlid in Iran, under salt stress in two years (2006 and 2007). Four salinity treatments (1, 5, 10 and 15 dS m-1) were used. The experimental design was a split plot which salt treatments were arranged as main plots and cultivars as subplots, based on a randomized complete block design with three replications. The measured parameters were yield and its components, mono, poly and disaccharides content in flag leaves. Results showed that grain yield, biological yield, harvest index, grain per ear, grain weight and plant height were reduced significantly by salt stress. In all treatments of salinity, CM67 cultivar produced the highest and UH3 cultivar produced the lowest grain and biological yield. In all cultivars, salinity stress decreased starch content but increased sucrose content. In high level of salinity, CM67 cultivar had the highest sucrose content (100.20 mg g-1) in comparison with other cultivars. Thus, this cultivar had the highest tolerance to salt stress than the others and is suitable for cultivation in salinity conditions.
  V.G. Omran , A. Bagheri and N. Moshtaghi
  This study surveyed a rapid, efficient and reproducible protocol for in vitro shoot regeneration and rooting by different explants and different concentration of BAP. Due to optimization of shoot regeneration, two media including of MS and modified MS (MS salts with double concentration of CaCl2 and B5 vitamins), different explants such as decapitated embryo axes, epicotyls and cotyledonary nodes and different concentrations of BAP hormone (1, 1.5, 2, 2.5, 3 and 4 mg L-1) in two genotypes (Gachsaran and Flip. 92-12 L) were used. The results showed that modified MS is a suitable medium for in vitro shoot regeneration of lentil. High levels of BAP caused increasing of shoot regeneration in lentil genotypes. Three milligram per liter of BAP induced the highest level of shoot regeneration. In addition, decapitated embryo explants were the best explants for highest shoot regeneration (5.8) (p<0.05). However, increasing of hormone concentration from 2 to 3 and 4 mg L-1 caused decreasing in the number of shoots, so 2 mg L-1 of BAP was best. For rooting, the in vitro-in vivo method of rooting was better than only in vitro method. The shoots regenerated in 2 mg L-1 BAP had higher rooting percentage than the shoots were regenerated in 3 and 4 mg L-1 BAP. These results indicate on the inhibitory effect of high concentration of BAP on root induction. But the genotype didn`t have any significant effect on rooting percentage and length of roots.
  E. Fazeli , F. Shahriari , H. Samizadeh , A. Bagheri and M. Farsi
  In current research, genetic relationships among rapeseed genotypes from several geographical origins including France, Canada, Germany, Iran, Hungary, Denmark, Australia and America were evaluated using RAPD markers. Among generated 86 bands, 80 different polymorphic bands were obtained using 9 random primers. Diversity Index (DI) or Polymorphism Information Content (PIC) was varied from 0.29 to 0.48, showed a relatively high potential of primers among studied genotypes. Dice similarity coefficient between genotypes was calculated using Nei and Li formula. Maximum (0.91) and minimum (0.42) similarity coefficients were observed between Bristol and Amber genotypes, consul and express, respectively. Cluster analysis based on dice similarity coefficient was also carried out. Base on the cluster analysis, genotypes were grouped into five main clusters. Results showed that genotypes with same geographical origin were genetically different. Therefore, geographical origins of genotypes cannot be used as a base to cross parent to obtain high heterosis and it must be carried out by exact genetic studies. Results confirmed that RAPD is a simple, cheap and fast method for evaluation of genetic diversity of Brassica napus.
 
 
 
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