نتایج جستجو برای: niobium surface preparation

تعداد نتایج: 799254  

2017
Telles Cardoso Silva Maíra dos Santos Pires Lívia Clara Tavares Lacerda Alexandre Alves de Castro

Transition metal oxides are considered as prototype models of reactions involving oxidative processes [1]. In this way, the detailed understanding of their electronic and molecular structure is of great interest in the prediction of their catalytic behavior and chemical reactivity toward inert organic molecules which are of industrial interest. In particular, it is possible to highlight the sel...

2004
S. K. Clowes W. R. Branford C. Grigorescu S. A. Manea O. Monnereau L. F. Cohen

The point contact Andreev reflection employing niobium tips was used to determine the degree of transport current spin polarization sPtd at the free surface of bulk NiMnSb at 4.2 K. The data was analyzed within the framework of a modified version of the Blonder, Tinkham, and Klapwijk formulism taking into account the two spin polarized channels in the ferromagnet and treating the interface as a...

Journal: :Journal of the Turkish Chemical Society, Section A: Chemistry 2022

In this study, aluminum (Al) film with high purity was coated on the Niobium (Nb) sheet by thermal evaporation under ultra-high vacuum. An Anodic Aluminum Oxide (AAO) nanotemplate prepared Nb sheet. During AAO preparation, three-dimensional (3D) nanopillars were grown We performed a simple 3D Artificial Intelligence (AI) analysis of nanopillars. According to experimental results, width is in ra...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه فردوسی مشهد - دانشکده ادبیات و زبانهای خارجی 1393

the current study aimed at investigating the relationship between motivation and test preparation strategies (tpss) used by iranian pre-university students in their preparation period for the university entrance exam (uee). due to the importance of uee in iran, this study also attempted to show its impact on these two important variables. to this end, 100 pre-university students in an iranian p...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سمنان 1388

abstract recent studies suggest that prelistening activities play an important role in the development of listening comprehension (e.g. long 1990;chiang and dunkel 1992; schmidt-rinehart 1994; jensen and hansen 1995; robinson et al., 1995; buck, 1995; foster and skehan,1996; teng 1996; robinson, 2001; chang and read 2006). in line with previous studies and to shed light on a new aspect of sche...

2010
M. Rašković J. Upadhyay L. Vuskovic S. Popovic

This Article is brought to you for free and open access by the Physics at ODU Digital Commons. It has been accepted for inclusion in Physics Faculty Publications by an authorized administrator of ODU Digital Commons. For more information, please contact [email protected]. Repository Citation Rašković, M.; Upadhyay, J.; Vuskovic, L.; Popovic, S.; Valente-Feliciano, A.-M.; and Phillips, L., ...

2008
Jordan Webster

High field Q-slope is a loss mechanism frequently encountered by superconducting radio frequency (SRF) cavities. The goal of this experiment was to identify correlations between cavity surface impurities, caused by either nitrogen gas or a thin layer of oxidized niobium, and high field Q-slope. Unfortunately, due to an unpredictable series of complications, cavity test results were not obtained...

Journal: :iranian chemical communication 2015
batol zakerinasab mohammad ali nasseri fateme kamali

quinolines, an important class of potentially bioactive compounds, have been synthesized by treatment of o-aminoarylketones and carbonyl compounds utilizing niobium (v) chloride / polyethylenglycole(nbcl5.peg) and niobium(v)chloride (nbcl5) as available and inexpensive catalysts. the quinoline derivatives were prepared in glycerol, an excellent solvent in terms of environmental impact, with hig...

2005
C. Ratsch G. Meijer

The far-infrared vibrational spectra for charged vanadium clusters as well as charged and neutral niobium clusters have been measured size specifically using farinfrared multiple photon dissociation. The ground state energy and vibrational spectra of a large number of stable and metastable structures for each of these sizes and systems have also been calculated using densityfunctional theory (D...

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