نتایج جستجو برای: c h formation
تعداد نتایج: 1872650 فیلتر نتایج به سال:
فرض کنیم b(h) جبر عملگرهای کراندار روی فضای هیلبرت مختلط h با dim h > 1 باشد.ثابت می کنیم نگاشت پوشای ? روی b(h) حافظ تصویر ضرب ناصفر است اگر و فقط اگر یک عملگر یکانی یا پادیکانی u روی h و ثابت c با شرط c^2 = 1 موجود باشند که برای هر a عضو b(h) داشته باشیم ?(a) = cu^*au. نتیجه مشابهی برای نگاشت هایی که ضرب سه تایی جردن را حفظ می کنند بدست می آوریم.
The C-C bond formation is an important reaction in organic synthesis to obtain value-added intermediates. Therefore, in this paper an attempt has been made to accelerate the Henry reaction (C-C bond formation) between aryl aldehydes and nitromethane using less expensive whole cell biocatalyst, baker’s yeast (BY). The scope of the methodology was also tested for the heteryl aldehyde i.e. 2-chlor...
In the crystal structure of the title polymeric compound, [C42H38N6O33Sr5.2(H2O)]n, five independent metal atoms (Sr1-Sr5) have different coordination environments. The Sr1 and Sr5 atoms are nine coordinated and feature distorted tricapped trigonal-prismatic and capped square-antiprismatic geometries, respectively....
A new derivative of Cyclotriphosphazene with xanthydrol as the oxygen-containing ligand was synthesized. Firstly Hexaclorocyclotriphosphazene was obtained Hexaclorocyclotriphosphazene from ammonium chloride and phosphorus pentachloride reaction and then the deprotonated xanthydrol was reacted with Hexaclorocyclotriphosphazene in the ratio of 6:1 in dry toluene as the solve...
the effects of magnesium hydroxide and l-lactide dimer as additives on thermal properties and morphology of poly(l-lactide) (plla) films were studied. hence, neat plla films and films containing additives (10% w/w) were prepared in dichloromethane at room temperature via solution casting. to evaluate thermal history on polymer properties, plla films were annealed by different processes. in one ...
Reitveld full profile refinement analysis has been done on Synchrotron diffraction data from a powder sample of YBCOx at RT and 500°C. Anisotropic peak broadening for (h00) and (hh0) lines has been observed by Williamson-Hall (W-H) analysis and that is in agreement with formation of twin's microstructures along (110) crystal planes in the sample. In addition, size and strain of the crystallites...
abstract amino acids are building blocks of proteins, and play a vital role in living beings existence and their functionality. the interaction of these compounds with metal ions is of great importance to biochemists, and chemists, because their functions can be utilized as a model in understanding enzymes mechanism for transport of metal ions to tissues. among twenty essential amino acids w...
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