a simple, sensitive and selective method for solvent extraction and spectrophotemetric determination of lanthanum (ii) europium (iii), and cerium (iii) is described , the rare earth metals are extracted into chloroform solution of n-phenylbenzohydroxamic acid (pbha) at ph 9-10 various parameters are studied to optimize the extraction conditions. the molar absorptivity is found to increase from ...

selective desulfurization of thiocarbonyls to carbonyls thioacetalization of aldehydes and ketones a useful reagent system for the dethioacetalization reactions

we commence by using from a new norm on l1(g) the -algebra of all integrable functions on locally compact group g, to make the c-algebra c(g). consequently, we find its dual b(g), which is a banach algebra so-called fourier-stieltjes algebra, in the set of all continuous functions on g. we consider most of important basic theorems about this algebra. this consideration leads to a rather com...

abstract foreign and iranian cultures are far distinct in the constraints imposed on writing and translating for children, since the iranian literary system is mainly concerned with cultural and religious instructions which lead to manipulation of translated texts. this study sought to identify the cultural and social constraints and norms which determined the strategies applied in the transl...

during natural gas processing, water in natural gas may cause to hydrates formation in pipelines which may lead to serious damages to process equipments. given the problems raised by present of water in natural gas, glycol solvent uses to remove water.in contact of glycol with gas always an amount of btex and voc absorb along with water, which on glycol recovery process, these substances separa...

 The purpose of this study was to develop a model of sustainable development of sport entrepreneurship in Iran from the point of view of strategic thinking using a systematic design of data theory. The participants in this study were experts and experts in the fields of sport management, entrepreneurship. The sampling method was theoretical; sampling was continued until theoretical saturation w...

abstract ion selective electrodes (ises) are electrochemical sensors that respond selectivity to the activity of ionic species. an ion-selective electrode is an electrochemical device that uses a thin selective membrane or film as the recognition element, and is an electrochemical half-cell equivalent to other half-cells of the zeroth (inert metal in a redox electrolyte). in common methods o...

The purpose of the present study is to develop a human resource management model with a sustainable organizational development approach. This research was conducted in the framework of a qualitative approach using Grounded theory research method. The statistical population of the study consisted of managers working in the electrical industry and were selected through theoretical and purposeful ...

The purpose of the present study is to develop a human resource management model with a sustainable organizational development approach. This research was conducted in the framework of a qualitative approach using Grounded theory research method. The statistical population of the study consisted of managers working in the electrical industry and were selected through theoretical and purposeful ...