‏‎the community dynamics of aquatic coleoptera(insecta)in one of the spring-stream habitats of bammo national park in fars province called cheshmeh-ye-ghanbari is studied as a pilot project and model for acquaintance with and furthering the biodiversity studies on fauna of iran. sixteen species-populations out of nineteen of this community were already identified for their taxonomy and for thei...

abstract in first part of this project, the use of a new and biguanid-like catalyst supported on silica as a recyclable catalyst provides a new route for the synthesis of a variety of arylalkylidene rhodanine derivatives through knoevenagle reaction in at present of solvent at room temperature. rhodanine derivatives and especially arylalkylidene rhodanines have proven to be attractive compound...

in new management approaches, in the organizations with inflexible structure, existing of red tapes and interruptions caused by limitations and also non-compliance with environmental changes, create demotivation among staff. with regard to the influence of job motivational potential and its relationship to the type of organizational structure( enabling and dissuasive), the goal of this research...

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...

Heterogeneity of distribution system of urban services is one of the most important consequences of the rapid growth of urbanization and physical development of cities in the country in the past decades. It has paved the way for social injustice and having urban services land uses in the regions and neighborhoods of a city. This research has been developed in order to measure access level of re...

The rapid growth of population in the third world countries specially in recent decades has posed an important social problem. There have been some attempts to propose solutions for this problem by scientists from various disciplines. However, it seems that an integrated approach calling for collaboration of various efforts can be more fruitful. In this work, we study the relation of women fert...

to explore the idea the investingation proposed, aimed at finding whether the performances of the population of iranians students studying english in an efl context are consistent in l1 and l2 writing taks and whether there is a cross-linguistic transfer in this respect. in this regard the subjects were instructed to write four compositions-two in english and two in farsi-which consisted of an ...

Under the influence of recent socio - economic and technological transformation, Iranian cities have experienced notable changes in their spatial structures. Reviewing the main aspects of morphological change in the City of Rasht, this paper attempts to analyze the underlying factors of recent spatial change and how it influenced the conditions of urban life in this city. The main data and i...

the methods which are used to analyze microstrip antennas, are divited into three categories: empirical methods, semi-empirical methods and full-wave analysis. empirical and semi-empirical methods are generally based on some fundamental simplifying assumptions about quality of surface current distribution and substrate thickness. thses simplificatioms cause low accuracy in field evaluation. ful...