نتایج جستجو برای: si 2
تعداد نتایج: 2581648 فیلتر نتایج به سال:
OBJECTIVE To evaluate the presence of spinal inflammation with and without sacroiliac (SI) joint inflammation on magnetic resonance imaging (MRI) in patients with active nonradiographic axial spondyloarthritis (SpA), and to compare the disease characteristics of these subgroups. METHODS ABILITY-1 is a multicenter, randomized, controlled trial of adalimumab versus placebo in patients with nonr...
1 For a tetrahedral of [SiO4], the asymmetrical vibrations of Si–O should always be IR active. Unfortunately, these modes were assumed to be IR inactive in Refs. [5,6]. 2 In Refs. [5,6], TO modes were calculated and compared with those obtained from IRAS using p-polarized and grazing incidence IR light [3– 6]. However, it is well-established that for dielectric thin films only the TO mode is ob...
Clinobaryl-ite, ideally BaBe(2)Si(2)O(7) (chemical name barium diberyllium disilicate), is a sorosilicate mineral and dimorphic with baryl-ite. It belongs to a group of compounds characterized by the general formula BaM(2+) (2)Si(2)O(7), with M(2+) = Be, Mg, Fe, Mn, Zn, Co, or Cu, among which the Be-, Fe-, and Cu-members have been found in nature. The crystal structure of clinobaryl-ite has bee...
The structural properties of the silicate garnets andradite, Ca(3)Fe(2)Si(3)O(12), uvarovite, Ca(3)Cr(2)Si(3)O(12), knorringite, Mg(3)Cr(2)Si(3)O(12), goldmanite, Ca(3)V(2)Si(3)O(12), blythite, Mn(2+)(3)Mn(3+)(2)Si(3)O(12), skiagite, Fe(2+)(3)Fe(3+)(2)Si(3)O(12), calderite, Mn(2+)(3)Fe(3+)(2)Si(3)O(12), and khoharite, Mg(3)Fe(3+)(2)Si(3)O(12), have been investigated with a quantum-mechanical mo...
We report the simultaneous and selective synthesis of single-crystalline Co(n)Si NWs (n = 1-3) and their corresponding crystal structures--simple cubic (CoSi), orthorhombic (Co(2)Si), and face-centered cubic (Co(3)Si)--following a composition change. Co(n)Si NWs were synthesized by placing the sapphire substrates along a temperature gradient. The synthetic process is a successful demonstration ...
در ادامه تحقیقات قبلی مبنی بر سنتز و چگالش ترکیبات �(Mo+Si+Al)به روش SHS، هدف این تحقیق مطالعه محصول سنتز شده از نظر ریزساختاری و فازی است. آنالیز گرماسنجیDSC، نشان داد که با افزایش در صد Al به سیستم Mo-Si، دمای سنتز از حدود1400به �C750 کاهش می یابد. بررسی های ریز ساختاری توسط SEM حاکی ازتوزیع یکنواخت Al در کل ریزساختار است بطوریکه با افزایش درصد �Alرشد دانه ها و تحدب بیشتر مرزدانه ها دیده می ش...
In this work, the radial distribution function (RDF) of H2 adsorption on coronene (C24) and its Si Substituted forms was investigated by Monte Carlo method. The effect of number and position of silicon substituent on the Coronene (C24) was compared. The maximum value of RDF at 298 K and 0.1 MPa is 4.34 for 18 Si, A structure at 0.73 Å. On the basis of results, t...
OBJECTIVE To compare signal intensity (SI) correction using scale and rescale slopes with SI correction using SIs of spleen and muscle for quantifying multiphase hepatic contrast enhancement with Gd-EOB-DTPA by assessing their correlation with T1 values generated from Look-Locker turbo-field-echo (LL-TFE) sequence data (ER-T1). MATERIALS AND METHODS Thirty patients underwent Gd-EOB-DTPA-enhan...
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