نتایج جستجو برای: تحلیل fe
تعداد نتایج: 315482 فیلتر نتایج به سال:
در این مطالعه از نانو حفره سیلیکاتی fe-mcm-41 (si/fe=120) به عنوان جاذب برای حذف کادمیوم از محلول های آبی استفاده شد. سیستم جذبی ناپیوسته مورد استفاده قرار گرفت. پارامترهای ph محلول، زمان تماس، غلظت اولیه کادمیوم ومقدار جاذب مورد بررسی قرار گرفت. مدل های ایزوترم های جذبی لانگمویر، فرندلیچ، تمکین، دوبینین – رادوشکوویچ و ردلیچ – پیترسون مطالعه شد. بهترین مدل تطبیق یافته با داده های آزمایش های تعا...
Long-lived goal reasoning systems that reason over their history confront the bounding problem–the impracticality of reasoning over a large, ever-growing experience-base. This is a problem with some explanation systems that use the history of their observations to inform beliefs about the current state of the world. We propose to apply narrative intelligence (NI), which includes the ability to ...
This paper describes a study of excited-state properties of naphthalimide (NI) and four 4-substituted derivatives: 4-chloronaphthalimide (Cl-NI), 4-methylthionaphthalimide (MeS-NI), 4-nitronaphthalimide (O(2)N-NI), and 4-(N,N-dimethylaminonaphthalimide (Me(2)N-NI). Steady-state absorption and fluorescence spectra were collected in solvents of varying polarity to determine the excited-state char...
The beneficial role of marcasite in iron-sulfide-based photo-electrochemical applications is reported for the first time. A spectacular improvement of the photoresponse observed experimentally for mixed pyrite/marcasite-FeS2 films can be ascribed to the presence of p/m phase junctions at the interface. Density functional theory calculations show that the band alignment at the phase boundary con...
Five Ni-Cr alloys were studied in order to identify the compounds formed on the alloy surface during oxidation under conditions similar to those encountered during dental laboratory procedures prior to application ofporcelain. After the alloys were oxidized, the films covering the surfaces were removed with the aid of a Br-methanol solution. X-ray diffraction was used to analyze the compounds f...
The synthesis of two molecular iron complexes, a dinuclear iron(iii,iii) complex and a nonanuclear iron complex, based on the dinucleating ligand 2,2'-(2-hydroxy-5-methyl-1,3-phenylene)bis(1H-benzo[d]imidazole-4-carboxylic acid) is described. The two iron complexes were found to drive the oxidation of water by the one-electron oxidant [Ru(bpy)3](3+).
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