نتایج جستجو برای: criii determination
تعداد نتایج: 251167 فیلتر نتایج به سال:
هدف تحقیق موردنظر بررسی ارتباط بین دانش لغوی زبان آموزان و استفاده آنها از راهبردهای یادگیری لغت می باشد. این تحقیق اساساً در نظر دارد علاوه بر راهبردهای یادگیری اثرگذار بر دامنه لغات، راهبردهای موثر در فهم لغات را هم شناسایی نماید. به عبارت دیگر هدف از این پژوهش پیدا کردن راهبردهای یادگیری لغاتی است که بهترین پیش بینی را بر دامنه ی لغات و فهم آن می کنند. راهبردهای یادگیری لغت به کار گرفته شده د...
a novel silver (ag) nanocomposite electrode was proposed that fabricated from metal nanostructures and ionic liquids. the combined application of unique properties of nanomaterials and ionic liquids in the design of this ag nanocomposite results in electrodes with interesting advantages compared to the conventional metal disk electrode. in the first part of this thesis, the elecrocatalytic eff...
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 ...
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...
in the present work, a simple and sensitive method was developed for determination of morphine and heroin using gold nanoparticles as resonance rayleigh scattering (rrs) and colorimetric technique’s probe. synthesized gold nanoparticles by sodium citrate reduction method have a negative charge layer on their surfaces because of self-assembled citrate anions on their surface. binding of morphin...
Although less famous than low-spin trivalent cobalt found in [CoIII(NH3)6?xClx]Cl3?x (x ? 3), which was exploited by Alfred Werner during the early part of 20th century for establishing basic rules coordination chemistry, related chromium complexes exhibit comparable kinetic inertness, a rare property along 3d-transition series. The associated slow isomerisation processes are compatible with is...
A relatively simple, sensitive, selective, automatic fluorimetric method for the simultaneous determination of chromium(III) and chromium(VI) by flow injection analysis (FIA) was developed. The method is based on the selective oxidation of the non-fluorescing reagent 2-(a-pyridyl)thioquinaldinamide (PTQA), which with Cr yields an intensely fluorescent product (lex = 360 nm; lem = 500 nm). Chrom...
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