نتایج جستجو برای: thermal and physical properties

تعداد نتایج: 17022352  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه یاسوج - دانشکده علوم 1391
ندا ملکپور, سید محمد اعظمی,

in this investigation the effect of external field on the electron density of nanostructures of cds, cdse, cdte, gaas and polymeric structure of three, four, five and six units of cds as a kind of nanosolar cells has been studied theoretically. as modeling this system in nanodimension, molecular structures has used. specific properties of molecular structures permit us to consider different sym...

ژورنال: پژوهش فیزیک ایران 2012
ربانی, حسن, مردانی, محمد, کشاورز, مهوش,

In this paper, we study the phonon and thermal properties of a nanocrystal by using transfer matrix method in the harmonic approximation. The considered system is a mass-spring nanocrystal with a square cross section. At first, for the ideal case, we obtain the phonon spectrum with free boundary conditions. Then we calculate some phonon transport properties of this system, namely, the phonon de...

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پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت مدرس 1387
لیزا نجا ر, محمد احسانی, هاشم کوزه چیان,

چکیده تمام نما مقدمه: این تحقیق برای بررسی میزان خلاقیت و عناصر آن (انعطاف- سیالی- ابتکار و بسط) در کارشناسان فوق برنامه های تربیت بدنی دانشگاههای تهران صورت گرفته است. بطور کلی خلاقیت به معنای توانایی تولید اندیشه ها و ایده های جدید و ترکیب آنها با یکدیگر و بیشتر در جنبه های فکری نظری و به اصطلاح فعالیتهای ذهنی و طراحی قبل از عمل به کار می رود و دارای چهار عنصر به شرح زیر می باشد. 1- سیالی...

15 صفحه اول
Journal: :international journal of nano dimension 0
s. hedayati chemistry department, islamic azad university-ardabil branch, ardabil, iran. a. hassanzadeh chemistry department, urmia university, urmia, iran. b. shaabani chemistry department, tabriz ,university, tabriz, iran. m. alem chemistry department, islamic azad university-ardabil branch, ardabil, iran. e. hobbolahi chemistry department, islamic azad university-ardabil branch, ardabil, iran.

one of the best and the most active ways for surveying thermal behaviour of materials is using differential scanning calorimetry. in this paper, the authors have studied thermal behaviour for schiff base ligand and their synthesized cobalt, nickel complexes. in this method, the sample is opposed to a controlled temperature change and its physical properties. here we studied melting point and tg...

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Journal: :physical chemistry research 2013
mahboobeh hadadian sara samiee hossein ahmadzadeh elaheh k. goharshadi

a nanofluid is a dilute liquid suspension of particles with at least one critical dimension smaller than ~100 nm. research works so far suggest that nanofluids offer excellent heat transfer enhancement over conventional base fluids. the enhancement depends on several factors such as particle shape, particle size distribution, volume fraction of nanoparticles, temperature, ph, and thermal conduc...

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Journal: :journal of dental school, shahid beheshti university of medical sciences 0
طاهره غفاری t ghafari dept. of prosthodontics, dental school, tabriz university of medical sciences, tabriz- iran.گروه پروتزهای دندانی، دانشکده دندانپزشکی، دانشگاه علوم پزشکی تبریز فهیمه حامدی راد f. hamedi rad dept. of prosthodontics, dental school, tabriz university of medical sciences, tabriz- iran.گروه پروتزهای دندانی، دانشکده دندانپزشکی، دانشگاه علوم پزشکی تبریز بهارک عزتی b. ezzati dept. of prosthodontics, dental school, tabriz university of medical sciences, tabriz- iran.گروه پروتزهای دندانی، دانشکده دندانپزشکی، دانشگاه علوم پزشکی تبریز

objective: studies have demonstrates that physical properties of denture base affect patient satisfaction and acceptance. thermal conductivity is among the most important properties of denture base influencing the sense of taste and gingival health. the conventionally used acrylic resin has a low coefficient of thermal conductivity. this study aimed to improve the thermal conductivity of acryli...

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Journal: :علوم و تکنولوژی پلیمر 0
وحید حدادی الهام تقدیر محمدرضا اله قلی قصری بنفشه گرجی

bituminous emulsion insulators are types of bituminous emulsions groups composed of different grades of bitumen emulsified in water by bentonite and emulsifiers at 80-90oc. these emulsions are water resistant after drying andtheir physical and mechanical properties are superior in comparison to bitumen properties. iranian climate, because of variety and extreme variations in temperature imposes...

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پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سمنان - دانشکده علوم تربیتی و روانشناسی 1391
سده معصومه سیدی اندی, شاهرخ مکوند حسینی, فرحناز کیان ارثی,

anxiety is one common disorder during childhood. in curing anxiety disorders, there are different types of psychological remedies, pharmotherapy, family therapy, and music therapy that can improve the individual’s anxiety, but we need some other remedies to improve social and emotional relationship and interactions. considering the importance of curing the anxiety disorders, the effect of sand ...

Journal: :علوم و تکنولوژی پلیمر 0
محمود مهرداد شکریه مجید صفرآبادی

the effects of physical, thermal and mechanical parameters on curing microthermal residual stresses are studied, based on the energy method, to present a theoretical solution for prediction of residual stress felds. a fnite element analysis is developed to compare the theoretical and numerical results together. there is found to be a good agreement between the results of the two methods. howeve...

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پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سیستان و بلوچستان - دانشکده مهندسی عمران 1391
مینا روشن دل هرمزی, محمود میری,

one of the most commonly used techniques to reduce the corrosion rate of rebar in concrete is addition substances named corrosion inhibitors into the concrete. corrosion inhibitor is chemical compounds that were added to concrete to prevent corrosion of steel in concrete. sodium nitrate is a type of anodic inhibitors that this study investigatesthe effect of this inhibitor on the properties of ...

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