نتایج جستجو برای: mechanical strength

تعداد نتایج: 419780  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت مدرس - دانشکده منابع طبیعی 1391

in this study, the effects of oleothermal modification on physical and mechanical peroperties of fir wood (abeis sp.) blocks were examined. at first, some blocks of fir wood with 5 × 20 × 120 cm dimensions were prepared. the blocks were treated in soybean oil. the effects of 3 factors such as treatments temperature (180and 200 °c), holding time (12 and 15 h) and initial moisture content of wood...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه علوم کشاورزی و منابع طبیعی گرگان - دانشکده منابع طبیعی گرگان 1391

چکیده: در این تحقیق تأثیر ملاس که یکی از محصولات جانبی صنایع قند می باشد به عنوان یک افزودنی مقاومت خشک جدید در بهبود پالایش پذیری و ویژگی های فیزیکی و مکانیکی مقوای کنگره ای کهنه (occ) مورد بررسی قرار گرفته شد. بدین منظور پنج سطح ملاس( 0،5، 10، 15 و 18%) و سه سطح درجه روانی(420،400و320 میلی لیتر)به عنوان فاکتورهای متغیر در نظر گرفته شد و برای هر تیمار کاغذهای دست ساز با مساحت 2cm200 و وزن پای...

Journal: :journal of dental school, shahid beheshti university of medical sciences 0
ساینا شمس زاده sayna shamszadeh وقارالدین اخوان زنجانی vaghareddin akhavan zanjani dental school, shahid beheshti university of medical sciences, tehran-iran، دانشکده دندانپزشکی، دانشگاه علوم پزشکی شهید بهشتی. مریم مفیدی maryam mofidi dental school, shahid beheshti university of medical sciences, tehran-iran، دانشکده دندانپزشکی، دانشگاه علوم پزشکی شهید بهشتی. مریم عبده تبریزی maryam abdo tabrizi dental school, shahid beheshti university of medical sciences, tehran-iran، دانشکده دندانپزشکی، دانشگاه علوم پزشکی شهید بهشتی. صنمبر یزدانی sanambar yazdani

objective: despite great advances made in dental composite resins, their use is associated with some concerns regarding their mechanical properties such as their flexural strength. considering the introduction of different composite resins into the market, there is a need to compare their mechanical properties and particularly flexural strength. this study aimed to compare the flexural strength...

Journal: :international journal of iron & steel society of iran 2015
e. karamian h. gheisari v. kadkhodaei a. monshi

silica refractory bricks are used especially in the metallurgical industries, due to desirable properties suchas high melting point, rigidity, and high temperatures strength. in this research, different amount of sicwere added to silica refractory containing different binders such as borax, boric acid, calcium nitride,sodium tri poly phosphate, sodium hexa meta phosphate (shmp) and lime. physic...

Journal: :journal of modern processes in manufacturing and production 2015
hassan gheisari ebrahim karamian

silica refractory bricks are used especially in the metallurgical industries, due to desirableproperties such as particularly their high melting point and their rigidity and strength at hightemperatures. in this research, different amount of sic were added to silica refractory containingdifferent binders such as borax, boric acid, calcium nitride, sodium tri poly phosphate, sodiumhexametaphosph...

Journal: :مهندسی بیوسیستم ایران 0
محمدحسین سعیدی راد استادیار پژوهش مرکز تحقیقات کشاورزی و منابع طبیعی خراسان رضوی علی اکبر حسین پور 2کارشناس ارشد، مکانیک ماشین های کشاورزی، دانشگاه فردوسی مشهد سعید ظریف نشاط استادیار پژوهش مرکز تحقیقات کشاورزی و منابع طبیعی خراسان رضوی

in this research, the effect of variety, harvesting time and fruit size were investigated on the mechanical properties of skin, density and mechanical strength. the results showed that pomegranate cultivars (ardestani, shisheh-cap and malas) had different skin thickness resulting difference in forces required for penetration of pomegranate fruit (10%). the skin of shisheh-cap variety was thicke...

Journal: :جنگل و فرآورده های چوب 0
علیرضا سوخته سرائی دانشگاه تهران سحاب حجازی دانشگاه تهران- دکترا لعیا جمالی راد دانشگاه گنبد کاووس محمد احمدی دانشگاه تهران سید بهنام حسینی دانشگاه تهران

in this study , the physical and mechanical properties of polypropylene composites reinforced with bagasse alkaline-sulfite-anthraquinone, soda-anthraqouinone, monoethanolamine-anthraquinone chemical pulps and mechanical pulp (cmp) known as pulp-plastic compostes (ppc) were investigated and the results were compared among ppcs and with polypropylene composites reinforced with bagasse flour know...

Journal: :Journal of Japan Institute of Light Metals 1971

Journal: :international journal of civil engineering 0
m. karimpour fard university of guilan, rasht, iran postal code: 1841 tel/fax: +98 131 3232806 n. shariatmadari iran university of science and technology narmak, teharn, iran postal code: 16846_13114 tel: +98 21 77451500-9 m. keramati iran university of science and technology narmak, teharn, iran postal code: 16846_13114 tel: +98 21 77451500-9 h. jafari kalarijani iran university of science and technology narmak, teharn, iran postal code: 16846_13114 tel: +98 21 77451500-9

due to the existence of fibrous materials such as plastic fragments, the strength anisotropy of municipal solid waste (msw) materials is the main source of differences between their mechanical response in direct shear and triaxial apparatus. as an extension of earlier research on the mechanical behavior of msw using a large traixail apparatus, results presented in shariatmadari et al. [1] and k...

2013
Xudong Chen Wanshan Huang Jikai Zhou

The aim of this study is to evaluate the moisture effect on the strength of concrete specimens that has completely cured. This study is also aimed to develop relations that can be used to determine the properties of concrete with different moisture contents that are normally experienced in outside conditions. Numerous compressions and split tensile tests are performed. In order to better unders...

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