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تعداد نتایج: 17007974 فیلتر نتایج به سال:
fluorescence chemical sensors for the highly sensitive and selective determination of pb2+ , hg2+, co2+ and fe3+ ions in aqueous solutions are described. the ion sensing system was prepared by incorporating lipophilic ligand (l) as a neutral ion-selective fluoroionophore in the plasticized pvc membrane containing sodium tetraphenylborate or potasium tetrakis (p-chlorophenyl) borate as a liphoph...
There are many problems that usually R & D centers and organizations in the decision making and achieve its higher goals, are faced with.Such as the density of information in the administrative departments, human resources information and facilities and equipment. The researcher had to make it investigate effective factors in improving management information systems in private banks according ...
Article history: Received 22 May 2014 Received in revised form 5 December 2014 Accepted 3 April 2015 Available online 24 April 2015 Time series of US patents permillion inhabitants show cyclic structureswhich can be attributed to the different knowledge-generating paradigms that drive innovation systems. The changes in the slopes between the waves can be used to indicate efficiencies in the gen...
abstract in the present research solution of chalcopyrite in sulfuric acid in hydrometallurgy method using electrochemistry with cyclic voltammetry technique has been investigated. the value of maximum reduction peak current of copper ions represents the measure of solubility. in this research different parameters temperature, potential, potential exert time, chalcopyrite concentration, sulfur...
the present study is paid to the evaluation of the welfare program of the unemployment insurance in iran. the main purpose which was the main reason for performing this thesis, was the unemployment insurance plan’s challenges in iran such as financial problems of this plan, prolongation of the credit receipt for some insured people, unemployment slow exiting from the unemployment insurance fund...
Artificial fertility conditions and its effects is an important issue in developed countries reviewed the law and rules concerning the situation has been. In France, two in 1994 in the field of law "with the help of artificial reproduction," passed the civil law and public health law reform in France and has been completed. In the law how to donate embryos to infertile couples to pass...
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