نتایج جستجو برای: variation complex
تعداد نتایج: 1059148 فیلتر نتایج به سال:
this study investigated the effects of manipulating the cognitive complexity of tasks along +/- few elements and the time limits on l2 learners writing performance. to conduct the study, 60 iranian efl learners with two levels of proficiency, low and high intermediate, were selected and assigned to three groups based on the time devoted to task completion. the participants performed both a simp...
A simple and rapid method has been developed for solvent extraction and spectrophotometric determination of copper (II) using o-methylphenyl thiourea (OMPT) as a sensitive reagent. The basis of proposed method is formation of copper (II)-OMPT complex. Copper (II) was extracted with 0.020 mol L-1 OMPT in chloroform from aqueous solution in 0.075 mol L-1 potassium iodate. The absorbance of comple...
the methods which are used to analyze microstrip antennas, are divited into three categories: empirical methods, semi-empirical methods and full-wave analysis. empirical and semi-empirical methods are generally based on some fundamental simplifying assumptions about quality of surface current distribution and substrate thickness. thses simplificatioms cause low accuracy in field evaluation. ful...
بتا-سیکلودکسترین ، قادر به تشکیل کمپلکس محاطی inclusion complex)) با شمار زیادی از مولکولها از جمله داروهای کم محلول و ناپایدار و ... است که در نتیجه تشکیل این کمپلکس ، حلالیت و پایداری این داروها افزایش می یابد.
background and objectives: mycobacterium tuberculosis complex is consisted of homogenous organisms. they are slowly growing mycobacteria and their isolation and identification are difficult and time consuming. differentiation of mycobacterium bovis, causative mammalian tuberculosis, from other members of mycobacterium tuberculosis complex is very important in epidemiology and control of disease...
in this work, a new spectrophotometric method for the determination of trace amount of cobalt (іі) ionwas investigated and the stability constant of the related complex was evaluated 2.174 × 104. in the cobalt(іі)-piroxicam complex, the maximum absorbance wavelength is 570 nm and the linearity of calibrationcurve was investigated (5-10 ppm). the relative standard deviation for seven replicate e...
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