نتایج جستجو برای: نانوپودر sic
تعداد نتایج: 13335 فیلتر نتایج به سال:
Streptococcal inhibitor of complement (Sic) is a highly polymorphic extracellular protein made by serotype M1 group A Streptococcus strains that contributes to bacterial persistence in the mammalian upper respiratory tract. New variants of the Sic protein arise very rapidly by positive selection in human populations during M1 epidemics. The human antibody response to Sic was analyzed. Of 636 pe...
A novel composite photocatalyst was synthesized by loading 5 wt % of platinum cobalt alloy on 3C-SiC nanowires and powder (Pt-Co-SiC) respectively via a simple polyol reduction method. Pt-Co-SiC were comprehensively characterized by SEM, HRTEM, XRD, PL, and XPS. The results indicated that Pt-Co nanoparticles in the size of 2-5 nm were dispersed homogeneously in the SiC nanowires and powders. Th...
BACKGROUND AND PURPOSE The aims of this study are to evaluate the risk factors for symptomatic ischemic complication (symptomatic ischemic complication [SIC], transient ischemic attack, or stroke) and microembolisms detected as MR diffusion-weighted imaging (MR-DWI)-positive (DWI(+)) lesions, and the relationship between DWI(+) and SIC after coiling of unruptured intracranial aneurysm. METHOD...
In recent years, much attention has been paid to the behavior of passive microwave sea ice concentration (SIC) products for marginal ice zones. Based on the definition of ice edges from ship observations, we identified pseudo-ship observations (PSO) and generated PSO ice edges from twelve cloud-free moderate-resolution imaging spectroradiometer (MODIS) images. Two SIC products of the advanced m...
Silicon carbide (SiC) is a particularly interesting species of presolar grain because it is known to form on the order of a hundred different polytypes in the laboratory, and the formation of a particular polytype is sensitive to growth conditions. Astronomical evidence for the formation of SiC in expanding circumstellar atmospheres of asymptotic giant branch (AGB) carbon stars is provided by i...
P ower electronics fabricated on the Silicon Carbide (SiC) platform can operate at higher temperatures, higher frequencies, and can delive higher circuit efficiencies as compared to traditional Si-based technologies [1]. The SiC transistors are especially attractive at 1.2 kV-10 kV ratings, particularly for medium and high-frequency applications [2]. Though SiC-based Schottky diodes were readil...
WC-10Co cemented carbides containing 1 to 4 wt% SiC nanoparticles were prepared by spark plasma sintering. The effects of SiC content on microstructure, mechanical properties and wear resistance of the sintered materials were studied. Microstructural studies showed that SiC addition resulted in WC grain coarsening. In addition, the hardness decreased with increasing SiC content. However, the fr...
در تحقیق حاضر برای اولین بار، با استفاده ار میکروذرات sic با ابعاد mµ20 کامپوزیت cu/sic به روش اتصال نوردی تجمعی ساخته شد. در این تحقیق ابتدا دو ورق مس پس از چربی زدایی برس کاری شده و ذرات sic در درصدهای مختلف بین 4/0 – 1/0 بین انها توزیع گردید و تحت کاهش ضخامت ?50 نورد گردید. این سیکل تا 5 پاس تکرار شد و خواص مکانیکی و ریزساختار نمونه ها مورد بررسی قرار گرفت. نتایج حاصل از آزمایش کشش تک محوری ...
در این تحقیق نانوپودر تیتانات سرب به‌روش فعال‌سازی مکانیکی سنتز شد. مواد اولیه شامل پودرهای اکسید تیتانیوم (آناتاز) و اکسید سرب (ІІ) با نسبت وزنی گلوله به پودر 10:1 و نسبت پودری ١:۱ به مدت 30 ساعت در آسیاب سیاره‌ای گلوله‌ای آسیا‌کاری شدند. سپس در دماهای 800، 900 و °C1000 عملیات حرارتی شدند. مشخصات نانوپودر حاصل توسط میکروسکوپ الکترونی روبشی گسیل الکترونی متاثر از میدان (FESEM)، پراش اشعه ایکس (...
We present here the first infrared spectra of meteoritic SiC grains. The mid-infrared transmission spectra of meteoritic SiC grains isolated from the Murchison meteorite were measured in the wavelength range 2.5–16.5 μm, in order to make available the optical properties of presolar SiC grains. These grains are most likely stellar condensates with an origin predominately in carbon stars. Measure...
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