for several years, researchers in familiarity of efl teachers with post-method and its role in second and foreign language learners’ productions have pointed out that the opportunity to plan for a task generally develops language learners’ development (ellis, 2005). it is important to mention that the critical varies in language teaching was shown is the disappearances of the concept of method ...

abstract cooperative learning refers to small groups of learners working together as a team to solve a problem, complete a task, or accomplish a common goal. in a cooperative environment one’s success is directly related to the success of other members because the focus on the individual shifts towards the group. to test the effectiveness of the method, using jigsaw technique, a study was cond...

this study investigates the cohesive devices used in the textbook of english for the students of psychology. the research questions and hypotheses in the present study are based on what frequency and distribution of grammatical and lexical cohesive devices are. then, to answer the questions all grammatical and lexical cohesive devices in reading comprehension passages from 6 units of 21units th...

چکیده این تحقیق با هدف پهنه­بندی آسیب­پذیری آبخوان مرند با استفاده از روش­های DRASTIC، AVI و مقایسه پهنه‌بندی در سه روش مذکور انجام شده است. روش DRASTIC از ترکیب هفت مشخصه هیدروژئولوژیک قابل اندازه­گیری و مؤثر در انتقال آلودگی به آب­های زیرزمینی تشکیل شده است. روش  AVIنیز دارای دو مشخصه است. نتایج حاصل از روش DRASTIC تقریباً کامل­ترین شاخص برای ارزیابی میزان آسیب­پذیری آب­های زیرزمینی است که مح...

abstract: in the paper of black and scholes (1973) a closed form solution for the price of a european option is derived . as extension to the black and scholes model with constant volatility, option pricing model with time varying volatility have been suggested within the frame work of generalized autoregressive conditional heteroskedasticity (garch) . these processes can explain a number of em...

nowadays enhancing critical thinking in learners is considered one of the foreign language teachers’ tasks due to its high position in foreign language classrooms. when it comes to selecting materials for language classrooms, there are obviously some criteria that teachers should apply. the present study aimed at a critical thinking based analysis of ten picture story books and ten folktales th...

there are many approaches for solving variety combinatorial optimization problems (np-compelete) that devided to exact solutions and approximate solutions. exact methods can only be used for very small size instances due to their expontional search space. for real-world problems, we have to employ approximate methods such as evolutionary algorithms (eas) that find a near-optimal solution in a r...

چکیده این تحقیق با هدف پهنه­بندی آسیب­پذیری آبخوان مرند با استفاده از روش­های drastic، avi و مقایسه پهنه بندی در سه روش مذکور انجام شده است. روش drastic از ترکیب هفت مشخصه هیدروژئولوژیک قابل اندازه­گیری و مؤثر در انتقال آلودگی به آب­های زیرزمینی تشکیل شده است. روش  aviنیز دارای دو مشخصه است. نتایج حاصل از روش drastic تقریباً کامل­ترین شاخص برای ارزیابی میزان آسیب­پذیری آب­های زیرزمینی است که مح...

there has been a gradual shift of focus from the study of rule systems, which have increasingly been regarded as impoverished, … to the study of systems of principles, which appear to occupy a much more central position in determining the character and variety of possible human languages. there is a set of absolute universals, notions and principles existing in ug which do not vary from one ...

nowadays in trade and economic issues, prediction is proposed as the most important branch of science. existence of effective variables, caused various sectors of the economic and business executives to prefer having mechanisms which can be used in their decisions. in recent years, several advances have led to various challenges in the science of forecasting. economical managers in various fi...