نتایج جستجو برای: high barrier
تعداد نتایج: 2131742 فیلتر نتایج به سال:
پنل های خورشیدی بخش کمی از تشعشع خورشید را به الکتریسیته تبدیل می کنند، قسمت اعظم تشعشع باقی مانده به گرما تبدیل شده و دمای پنل را افزایش می دهد. با افزایش دمای سلول فتوولتائیک، بازده کاهش می یابد. در این پایان نامه برای کاهش دمای ماژول فتوولتائیک، یک واحد گرمایی با سیال عامل هوا، ساختار مارپیچ و سطح مقطع مستطیلی طراحی و ساخته می شود. واحد گرمایی در پشت پنل نصب می شود و سیستم فتوولتائیک /گرمای...
a method is described by which it is possible to determine the high barrier to ring inversion and hindered rotation by neat racemization of optically active compounds when the racemization is caused by ring inversion or hindered rotation. the method is based preparation of sufficiently pure enantiomers, mainly by chromatography on swollen microcrystalline triacetylcellulose (tac). by this techn...
Background Despite successful cloning of many mammalian species, the cloning efficiency is extremely low compared to that of IVF raising the possibility of the existence of epigenetic barrier preventing successful cloning. MaterialsAndMethods Using comparative transcriptome analysis comparing transcriptomes of IVF and SCNT embryos and that of donor cells, we identified epigenetic barrier and fi...
Background and purpose : Instalation of protective barrier against diagnostic x-ray is generally done based on the recommendations of NCRP49. There are analytic methods for designing protective barriers howerer, they lack sufficient efficiency and considering the NCRP49 reports, designing mechanical protective barrier in order to protect the initial x-ray radiation and absorption of the ray q...
the aim of this study was to investigate the barrier properties of cellulose nanocrystals-pvananocomposites. nanocomposite films with different filler loading levels (3, 6, 9 and 12% by wt) weredeveloped by solvent casting method. the effect of cellulose nanocrystals on the barrier properties ofthe nanocomposites was studied. to this end, moisture absorption, water vapor permeability (wvp),oxyg...
Background and aimsThe paper presents the results of an investigation on the acoustic performance of tilted profile parallel barriers with quadratic residue diffuser tops and faces.MethodsA2D boundary element method (BEM) is used to predict the barrier insertion loss. The results of rigid and with absorptive coverage are also calculated for comparisons. Using QRD on the top surface and faces o...
a comprehensive study of schottky barrier mosfet (sbmosfet) scaling issue is performed to determine the role of wafer orientation and structural parameters on the performance of this device within non-equilibrium green's function formalism. quantum confinement increases the effective schottky barrier height (sbh). (100) orientation provides lower effective schottky barrier height in comparison ...
A comprehensive study of Schottky barrier MOSFET (SBMOSFET) scaling issue is performed to determine the role of wafer orientation and structural parameters on the performance of this device within Non-equilibrium Green's Function formalism. Quantum confinement increases the effective Schottky barrier height (SBH). (100) orientation provides lower effective Schottky barrier height in compa...
A method is described by which it is possible to determine the high barrier to ring inversion and hindered rotation by neat racemization of optically active compounds when the racemization is caused by ring inversion or hindered rotation. The method is based preparation of sufficiently pure enantiomers, mainly by chromatography on swollen microcrystalline triacetylcellulose (TAC). By this t...
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