abstract amino acids are building blocks of proteins, and play a vital role in living beings existence and their functionality. the interaction of these compounds with metal ions is of great importance to biochemists, and chemists, because their functions can be utilized as a model in understanding enzymes mechanism for transport of metal ions to tissues. among twenty essential amino acids w...

the quest for power has formed much of the world history especially in 20th and 21st centuries. oil (energy) particularly after industrial revolution has been a tool for conquest and power and has been transformed to a geopolitical issue. from a geopolitical point of view this has been the case for the last two centuries in central asia and caucasus. central asia and caucasus has always been...

iran has witnessed several movements and riots to achieve freedom, independence, justice and progress between the constitutional revolution and the emerging of reza khan. those move­ments, which were born along a desire to gain constitution eventually lost steam. ultimately, reza khan, posing to be a unique savior, appeared and buried the weak body of the constitution move­ments. this article s...

some new water-soluble schiff base complexes of na2[m(5-so3-1,2-salophen)].nh2o; (5-so3-1,2-salophen = n,n’-bis(5-sulphosalicyliden)-1,2-phenylendiamine); na2[m(5-so3-2,3-salpyr)(h2o)n].2h2o; (5-so3-2,3-salpyr = n,n’-bis(5-sulphosalicyliden)-2,3-diaminopyridine); and na2[m(5-so3-3,4-salbenz)(h2o)n].nh2o; (5-so3-3,4-salbenz = n,n’-bis(5-sulphosalicyliden)-3,4-diaminobenzophenon); where m = cu, n...

روش شبکه بولتزمن روشی با مبنای ذره ای-جنبشی است که برای شبیه سازی جریان سیالات مورد استفاده قرار می گیرد. مهمترین مزیت این روش نسبت به روش های سنتی دینامیک سیالات محاسباتی، صریح بودن معادله اصلی حاکم بر آن، سادگی اعمال شرایط مرزی گوناگون و قابلیت ذاتی موازی سازی پردازش مسیله می باشد. که آن را به روشی مناسب برای شبیه سازی جریان های متنوع و پیچیده سیال تبدیل می نماید. یکی از مسایل مهمی که در دینا...