in this investigation the effect of external field on the electron density of nanostructures of cds, cdse, cdte, gaas and polymeric structure of three, four, five and six units of cds as a kind of nanosolar cells has been studied theoretically. as modeling this system in nanodimension, molecular structures has used. specific properties of molecular structures permit us to consider different sym...

some rural-urban migrations, especially in countries and regions with strong kinship, tribal, community and ethnic relationships, have led to the creation of ethnic businesses within which entrepreneurial and business elites emerge. In some cases, the financial resources of these people return to their native villages and lead to rural development. Therefore, this research seeks to find the str...

muhammad ibn muhammad ibn numan, known as "shaykh mufid," one of the great imamiye theologians and jurists in the fourth and early fifth century , had comprehensive mastery of both rational and traditional topics and exerted his influence upon both his contemporary and future scholors. he is considered to be one of the top imamiye scholars who spent his lifetime teaching, learning and authorin...

Introduction Many rural development projects and projects are not being evaluated. Therefore, rural developers rarely know their short-term and long-term implications. On the other hand, in order to achieve efficient service and comprehensive coverage of services in all rural areas, emphasis is placed on reaching the hierarchy of rural areas, and to achieve these two objectives, the preparatio...

Over the past decades, the horizontal growth of cities has led to the integration of rural-garden areas within the parent city. This phenomenon is more serious in the arid areas of Iran because of the limited networks of water supply (Qanat) and the proximity of settlements around this network and has caused the destruction of the gardens of these urban textures that are rural-based. This resea...

Introduction One of the necessary principles of rural development is its management. A special approach of development is needed to be planned for every particular area. On the other hand, it is not useful to apply an integrated approach of development by new managing systems. At this point we can clearly understand the important role of institutions and organizations related to the structur...

this research has been taken among the students of high school in karaj city during the years 1391 and 1392. this is a survey research and data gathering is through questionnaires. studying the “an analysis of students’ tendency toward non-native reference groups in karaj”. the questionnaire was distributed among 260 of these students who were chosen through multi step cluster sampling. conside...

abstract this study aimed at analyzing a corpus of emails gathered from iranian students studying in england. the corpus contained 996 emails that were investigated by employing the framework of chen (2006) to find common patterns in the discourse of these emails. another aim of the study was to find how two request acts (want statements and query preparatory) were used in the emails. the...