نتایج جستجو برای: ایزو 3800
تعداد نتایج: 1808 فیلتر نتایج به سال:
با توجه به کاربرد گسترده اتصالات پیچی در صنایع، تخمین عمر خستگی پیچ ها امری مهم است. در پژوهش حاضر هدف تخمین عمر خستگی پیچ های اتصال دو فلنج در یک پوسته استوانه ای تقویت شده همراه با گشودگی است. برای تخمین عمر پیچ مذکور به دو دسته اطلاعات نیاز می باشد: خواص خستگی پیچ و مقدار تنش وارد شده به آن تحت بارهای اعمالی به سازه. لذا دو مسیر پیموده شده است. ابتدا خواص خستگی پیچ مورد نظر مطابق استاندارد ا...
اتصالات پیچی نقش مهمی در صنعت ایفا می کنند و نگرانی عمده ی مهندسان تخمین عمر اینگونه اتصالات است. در حقیقت، فلسفه ی طراحی در دهه ی اخیر تغییر کرده و تمرکز تحقیقات به جای تحلیل مقاومت استاتیکی روی عمر خستگی قرار گرفته است. عمر خستگی اتصالات پیچی به عوامل زیادی همچون قطر پیچ، گام دندانه پیچ، گشتاور بستن و ... بستگی دارد. با این وجود، اطلاعات کم آزمایشگاهی موجود است که در آن رفتار پیچ را به تنهایی...
Author details Centre for Biomedical Research, Burnet Institute, Melbourne 3004, VIC, Australia. Department of Medicine, University of Melbourne, Melbourne 3050, VIC, Australia. Department of Chemical and Biomolecular Engineering, University of Melbourne, Melbourne 3800, VIC, Australia. Department of Infectious Diseases, Monash University, Melbourne 3800, VIC, Australia. Department of Immunolog...
Wildlife Ecology Research Group, School of Biological Sciences, Monash University, Victoria 3800, Australia 2 Department of Psychology, School of Psychology, Psychiatry and Psychological Medicine, Monash University, Victoria, 3800, Australia Applied Ornithology Group, The Johnstone Centre, Charles Sturt University, Thurgoona NSW 2640 Australia Australian Centre for Biodiversity: Analysis, Polic...
a School of Geography and Environmental Science, Monash Water for Liveability, Monash University, Melbourne, VIC 3800, Australia b School of Social Sciences, Monash Water for Liveability, Cooperative Research Centre for Water Sensitive Cities, Monash University, Melbourne, VIC 3800, Australia c School of Social Sciences, Monash Water for Liveability, Monash University, Melbourne, VIC 3800, Aust...
Past studies have indicated that transcription of all X-linked genes is repressed by meiotic sex chromosome inactivation (MSCI) during the meiotic phase of spermatogenesis in mammals. However, more recent studies have shown an increase in steady-state levels of certain X-linked miRNAs in pachytene spermatocytes, suggesting that either synthesis of thesemiRNAs increases or that degradation of th...
Flight Mass Spectrometers (ATOFMS) in the 3800 series of instruments with built-in Aerodynamic Focusing Lens technology. Without a focusing lens, the ATOFMS samples particles from a variety of sources through a nozzle. Typically, particles from about 100 to 3000 nanometers are sampled with sharply decreasing efficiency for smaller sizes. To overcome this size bias, to sample smaller particles e...
he Model 3800 Aerosol Time-of-Flight Mass Spectrometer (ATOFMS) is a revolutionary instrument in the field of analytical chemistry, and it offers great potential in areas such as atmospheric science, biological detection, and pharmaceutical manufacturing. Based on an instrument built by Prof. Kimberly A. Prather and her associates at the University of California, Riverside (Gard et al.), TSI Mo...
Coarse woody debris (CWD) biomass was measured and mapped in burned, clearcut, and intact lodgepole pine forests in two areas of the Rocky Mountains of Wyoming: the Medicine Bow National Forest (MBNF) and Yellowstone National Park (YNP). In addition, the amount of CWD consumed or converted to charcoal by fire was estimated in a recently burned stand in YNP. A spatially explicit simulation model...
We investigated the effects of the shape of leaf area profiles and the number of canopy layers on simulated sensible and latent heat fluxes using a gradient diffusion-based biometeorological model. Three research questions were addressed through simulation experiments: (1) Given the same amount of cumulative leaf area in the vertical direction, how does the shape of the leaf area profile affect...
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