نتایج جستجو برای: دندان metal structure

تعداد نتایج: 1743061  

امینیان, رویا, قاسمی, امیر, ولیان, اعظم, گرامی, الهیار,

سابقه و هدف: ترمیم مناسب دندان های درمان ریشه شده موضوعی است که بسیار مورد تردید است. یکی از نکات مهم در این ترمیم ها حفاظت ساختمان باقی مانده دندان و جلوگیری از شکست دندان می باشد، این مطالعه با هدف بررسی تاثیر نوع پست بر توزیع تنش در دندان سانترال ماگزیلا با کانال تضعیف شده به روش اجزا محدود صورت پذیرفت.مواد و روشها: در این مطالعه توصیفی، برای تحلیل تنش از روش اجزای محدود (Finite element) سه ...

حسینی, سید ابراهیم, ظهیری, زینب, کبیریان دهکردی, بهنام,

In this paper, we report a new structure for bipolar junction transistors based on concept of surface inversion. This structure is made up of only one PN junction and a metal with appropriate work function connected to the p region which results in an inversion of electrons in the semiconductor near the metal-semiconductor interface, this inversion layer plays the role of emitter n+ region. Sim...

Journal: :international journal of iron & steel society of iran 2012
i. hajiannia m. shamanian m. kasiri

in the present study, the corrosion behavior of aisi 347 austenitic stainless steel to astm a335 low alloysteel dissimilar joint was investigated. for this purpose, two filler metals, er309l and ernicr-3, were selected to be used during the gas tungsten arc welding process. to investigate the corrosion behavior of the joints after welding, the specimens were tested in 3.5% sodium chloride solut...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه بیرجند - دانشکده ادبیات و علوم انسانی 1392

in new management approaches, in the organizations with inflexible structure, existing of red tapes and interruptions caused by limitations and also non-compliance with environmental changes, create demotivation among staff. with regard to the influence of job motivational potential and its relationship to the type of organizational structure( enabling and dissuasive), the goal of this research...

Journal: :Litiyo i Metallurgiya (FOUNDRY PRODUCTION AND METALLURGY) 2020

Journal: :journal of nanostructures 2012
y. vahidshad r. ghasemzadeh a. irajizad a. masoud

cuals2  chalcopyrite  nanocrystalline  are  synthesized  with  facile method.  the  heat  arrested  solvothermal  method  for  synthesize nanocrystalline  were  investigated.  the  time  duration  of  synthesis, temperature of solution and metal salts to solvent molar ratio can be parameters  that we are  studied. the nanoparticles were  synthesized with cucl, alcl3 and  thiourea (sc(nh2)2) as ...

The p-i-n carbon nanotube (CNT) devices suffer from low ON/OFF current ratio and small saturation current. In this paper by band bending engineering, we improved the device performance of p-i-n CNT field effect transistors (CNTFET). A triple gate all around structure is proposed to manage the carrier transport along the channel. We called this structure multi-segment gate (MSG) CNTFET. Band to ...

Journal: :jundishapur journal of health sciences 0
roghieh abedini department of occupational health, student research committee, school of health and nutrition, shiraz university of medical sciences, shiraz, ir iran ali reza choubineh department of ergonomics, research center for health sciences, shiraz university of medical sciences, shiraz, ir iran ahmad soltanzadeh department of occupational health, student research committee, school of health and nutrition, shiraz university of medical sciences, shiraz, ir iran reza ghiasvand cancer research center, cancer institute of iran, tehran university of medical sciences, tehran, ir iran reza ghiasvand cancer research center, cancer institute of iran, tehran university of medical sciences, tehran, ir iran mahnaz kazem haghighi department of occupational health, student research committee, school of health and nutrition, shiraz university of medical sciences, shiraz, ir iran

musculoskeletal disorders have devoted a high percentage of occupational injuries and is one of the leading causes of occupational injuries and disabilities in industrialized and developing countries. the aims of this study were to evaluate exposure of musculoskeletal disorders risk factors by quick exposure check (qec) technique and to determine prevalence of musculoskeletal disorders and thei...

Journal: :ElectroComponent Science and Technology 1976

The p-i-n carbon nanotube (CNT) devices suffer from low ON/OFF current ratio and small saturation current. In this paper by band bending engineering, we improved the device performance of p-i-n CNT field effect transistors (CNTFET). A triple gate all around structure is proposed to manage the carrier transport along the channel. We called this structure multi-segment gate (MSG) CNTFET. Band to ...

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