The electrochemiluminescence (ECL) behavior of pyronin derivatives was reported. We found that these derivatives, as novel ECL emitters, generated an efficient emission phenomenon; is, they showed anodic using tri-propylamine (TPA) the coreactant and cathodic K 2 S O 8 coreactant. Because its remarkable luminescent performance, mechanism (reductive-oxidative oxidative-reductive) benzylthiol-sub...

Many optimization problems of practical interest are computationally intractable. Therefore, a practical approach for solving such problems is to employ heuristic (approximation) algorithms that can find nearly optimal solutions within a reasonable amount of computation time. An improvement algorithm generally starts with a feasible solution and iteratively tries to obtain a better solution. Ne...

education. today, a qualitative movement toward efficient trainings ineducational systems is necessary, since one of the important factors in the development and progress of any society is necessarily resources, manpower and their education.considering education as a basic system in growing human resources, the present article tries to address this matter, due to the fact that we are in a situ...