نتایج جستجو برای: slamming force

تعداد نتایج: 188450  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی امیرکبیر(پلی تکنیک تهران) - دانشکده مهندسی کشتی سازی بندرعباس 1387

خستگی به عنوان یک پدیده مکانیکی مخرب علاوه بر سازه های زمینی، در سازه های دریایی که تحت تنشهای متغیر هستند مطرح می باشد. بارهای متغیر ناشی از امواج دریا روی بدنه شناورهای کامپوزیتی سبب می گردد که ورق کامپوزیتی بدنه در تنشهایی بسیار کمتر از تنش شکست استاتیک دچار شکست گردد. بررسی رفتار خستگی مواد مرکب با توجه به کاربردهای روزافزون آنها از اهمیت خاصی برخوردار است. اگر چه مدلهای متعددی برای بررسی پ...

Journal: :acta medica iranica 0
ea. niaki a. zamani e. yazdi

prostaglandin £j (pge-^) and indomethacin, a nonstroidal antiinflammatory drug, were separately administered during ortliodontic tooth movement in rats. at the beginning, an orthodontic appliance was placed and activated in male albinos rats. in tlie first examination, the experimental group received submucosal injections of pge-y (10 mg/kg/day) near the first maxillary riglit molars, and alcoh...

Journal: :archives of trauma research 0
meghdad teymouri department of physical education, shahrood branch, islamic azad university, shahrood, ir iran; department of physical education, shahrood branch, islamic azad university, shahrood, ir iran.tel: +98-9124731994, fax: +98-2733373650سازمان اصلی تایید شده: دانشگاه آزاد اسلامی شهرکرد (islamic azad university of shahrekord) heydar sadeghi department of physical education and sport sciences, tarbiat moallem university, tehran, ir iran amir nabaei department of electrical engineering, shahrood university of technology, shahrood, ir iranسازمان اصلی تایید شده: دانشگاه صنعتی شاهرود (shahrood university of technology) amir kasaeian department of epidemiology and biostatistics, school of public health, tehran university of medical sciences, tehran, ir iranسازمان اصلی تایید شده: دانشگاه علوم پزشکی تهران (tehran university of medical sciences)

conclusions the study revealed the significance of anthropometric variables related to heading, such as age and head perimeter. therefore, it was concluded that these variables should be considered when teaching and practicing the heading technique with players of different ages and anthropometric sizes. results significant correlations existed between the force exerted on the head during headi...

Journal: :مهندسی بیوسیستم ایران 0
هادی عظیمی نژادیان دانشجو تیمور توکلی هشجین دانشگاه تربیت مدرس برات قبادیان دانشگاه تربیت مدرس سید سالار حسینی دانشجو

abstractin this study, the tensile force requirement, to separate the grain paddy was measured. the velocities of grain paddy it 100, 200, 300, 400, and 500 mm/min, and force requirement to failure stem at 100, 300, and 500 mm/min velocities was measured by using instron device. the data was analyzed using a completely randomized design. the results showed that velocity had a significant effect...

Journal: :Journal of cell science 2003
Malcolm R Alison Richard Poulsom William R Otto Pamela Vig Mairi Brittan Natalie C Direkze Sean L Preston Nicholas A Wright

Notwithstanding the fact that adult bone marrow cell engraftment to epithelial organs seems a somewhat uncommon event, there is no doubt it does occur, and under appropriate conditions of a strong and positive selection pressure these cells will expand clonally and make a significant contribution to tissue replacement. Likewise, bone-marrow-derived cells can be amplified in vitro and differenti...

Journal: :Perception & psychophysics 2008
Brett R Fajen

Performance on a visually guided action may improve with practice because observers become perceptually attuned to more reliable optical information. Fajen and Devaney (2006) investigated perceptual attunement, using an emergency braking task in which subjects waited until the last possible moment before slamming on the brakes. The subjects in that study learned to use more reliable optical var...

Journal: :International Journal of Naval Architecture and Ocean Engineering 2018

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