â liquefied natural gas (lng) is the most economical way of transporting natural gas (ng) over long distances. liquefaction of ng by using vapor compression refrigeration system requires high operating and capital cost. due to lack of systematic design methods for multistage refrigeration cycles, the conventional approaches of determining optimal cycle configuration are mostly based on trial-an...

Nowadays, thousands tons of chemicals material are used to increase agricultural production that provides a risky situation for the communities. Recently, biological or organic agriculture is considered to get rid of such problems. But this style of agriculture is facing with many difficulties and challenges. This study was performed in three phases by using Delphi method. In this regard, the s...

nowadays information and communication technology(ict) function as a powerful tool influencing human affairs including social, economical, cultural and political issues. countries which invoke these technology are seriously developing much faster from those which make weaker steps. in this sense, it is useful to make comparison between the available statistics in iran with those of other countr...

among the traditions concerning the signs of wisdom, there is a tradition related from imam al-ṣādiq (a.s.) introducing the person wearing a long beard, the signet of his ring, and his nickname, as indications of his lack of wisdom. while examining the sanad and text of this tradition, the article seeks to find out the real source of this saying and the various possibilities about the source an...

Due to its location in the dry belt, the vast country of Iran has always been faced with the problem of water shortages. In such a climate one should take measures to increase the productivity and improve the efficiency of irrigation through expansion of water-conserving technology in the agricultural sector, as this is the largest and most important consumer of water. Therefore this study aime...

nowadays clean energy and technological innovation in this field have becomevery important. dynamic innovation and technology development are done by the formation of technological innovation systems and factors influencing thefunctions of system play a key role in the emergence of such systems.considering the lack of previous researches in this area, this research seeks toanswer the question t...

course contents of b.sc. and even m.sc. or ph.d. programs in electrical power engineering in our country is mainly based on conventional; technologies employed in different sectors of generation, transmission and distribution of electricity. electricity industry in iran has been successful in localization and transfer of technology from foreign countries and research centers and universities ha...

Background: The fertility tourism is a term refers to the cross-border movements made by infertile patients in order to receive reproductive treatment through assisted reproductive technology. In recent years the number of countries involved in medical tourism has been increased. The aim of this study is to provide an overview of the research that has explored aspects of crossborder reproductiv...