نتایج جستجو برای: Unit cell

تعداد نتایج: 2031856  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه زنجان - دانشکده فنی 1393

در طی سال های اخیر استفاده از مواد کامپوزیتی به خصوص در صنایع خودرو سازی، هوافضا و صنایع مرتبط با وسایل ورزشی، بسیار رواج یافته است. به طور معمول مواد کامپوزیتی از دو فاز تشکیل شده است که به طور فیزیکی، مجزا از یکدیگر می¬باشند. از جمله انواع کامپوزیت¬ها، کامپوزیت¬های طبیعی هستند. این دسته از کامپوزیت¬ها کامپوزیت¬هایی هستند که بر خلاف کامپوزیت¬های معمول که با الیاف مصنوعی تقویت می¬شوند، با الیاف...

Journal: :journal of computational applied mechanics 0
z. sarvi m.sc., faculty of mechanical engineering, k.n. toosi university of technology, tehran, iran m. shariyat professor, faculty of mechanical engineering, k.n. toosi university of technology, tehran, iran m. asgari assistant professor, faculty of mechanical engineering, k.n. toosi university of technology, tehran, iran

a closed form three-dimensional solution is presented for determination of the local buckling (cell buckling) load of the nanosheets. moreover, an expression is proposed for the effective 2d young’s modulus of the unit cell of the nanosheet. in this regard, a three-dimensional efficient space-frame-like geometrical model with angular and extensional compliances is considered to investigate stab...

Journal: :amirkabir international journal of electrical & electronics engineering 2014
i. aryanian a. abdipour gh. moradi

in recent years reflectarray antennas have received considerable attention due to their unique capabilities. however, due to their large size, analyzing the performance of these antennas using traditional full wave finite-difference and finite-element techniques requires considerable computational resources. in this paper, we present an efficient method to accurately analyze these class of ante...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه ارومیه - دانشکده منابع طبیعی 1393

تحقیقات مختلف اثبات نموده اند که رشد و محتوای بیوشیمیایی روتیفرها می تواند تحت تاثیر نوع غذا و غلظت مواد غذایی تغییر نماید. ریز جلبک ها به عنوان یکی از منابع غذایی مهم برای کشت روتیفرها به ویژه از لحاظ شاخص های نظیر رشد، بقا، میزان پروتئین، چربی و اسیدهای چرب، ضروری می باشند. لذا تحقیق حاضر جهت مقایسه جلبک خشک (کلرلای پودری) و جلبک های تازه (ایزوکرایسیس گالبانا و نانوکلروپسیس آکولاتا) بر رشد، ت...

Massoud Rafizadeh

The reaction of barium chloride with 2, 6-pyridinedicarboxylic acid in water led to the formation of a novelpolymeric complex formulated as {[Ba2(Hpydc)2(pydc)(H20)3].H20.(H2pydc)}.(I). The crystal structure of (I)was characterized by single crystal X-ray diffraction method. The complex was crystallized in the monoclinicsystem with space group P2/c, with four molecule in unit-cell, e.g Z=4. The...

قاسمی, احمدرضا, محمدی, محمد,

In this study, Circular Disk Model (CDM) has been developed to determine the residual stresses in twophase and three- phase unit cell. The two-phase unit cell is consisting of carbon fiber and matrix. The three-phase unit cell is consisting of carbon fiber, carbon nanotubes and matrix in which the carbon fiber is reinforced with the carbon nanotube using electrophoresis method. For different vo...

This paper proposes novel Fuel Cell Auxiliary Power Unit (FCAPU) for J150+ aircraft application. The primary version of APU in J150+ aircraft is a gas turbine Auxiliary Power Unit (APU) which is based on gas turbine jet engine but in the suggested FCAPU, the generated electrical power is achieved from chemical energy with higher efficiency. The Solid Oxide Fuel Cell (SOFC) technology is used to...

Journal: :journal of physical & theoretical chemistry 2015
massoud rafizadeh

the reaction of barium chloride with 2, 6-pyridinedicarboxylic acid in water led to the formation of a novelpolymeric complex formulated as {[ba2(hpydc)2(pydc)(h20)3].h20.(h2pydc)}.(i). the crystal structure of (i)was characterized by single crystal x-ray diffraction method. the complex was crystallized in the monoclinicsystem with space group p2/c, with four molecule in unit-cell, e.g z=4. the...

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A new thiosemicarbzone compound was prepared by the reaction of acenaphthenequinone and thiosemicarbazide (1:1 molar ratio) in absolute methanol at 70°C. The crystal structure of this compound, acenaphthenequinone thiosemicarbazone mono methanol, was determined by X-ray crystallography. The unit cell parameters are as follows: a = 7.0384(14) Ǻ, b = 14.202(3) Ǻ, c = 14.270(3) Ǻ, β = 104.26(3)°. ...

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The reaction of gallium (III) nitrate octahydrate with the proton transfer compound (pydaH2)2+ (pydc)2– ( where  pyda  is 2,6-pyridinediamine and pydcH2 is 2,6-pyridinedicarboxylic acid) leads to the formation of (C5H8N3) [Ga(C7H3NO4)2] · 4H2O · CH3OH. The crystal system of the anionic complex is triclinic with space group Pī and two molecules per unit cell. The unit cell parameters are a=10.23...

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