نتایج جستجو برای: 3500 bc
تعداد نتایج: 19762 فیلتر نتایج به سال:
Background: Knowledge of the weight of the foetus in utero is important for the obstetricians to decide the time and mode of delivery. It can be estimated clinically, biochemically or by radiological imaging .None of the diagnostic tools are direct .Interestingly clinically estimated foetal weight is being found more precise than radiological estimation Aim:. This study was designed to find the...
رمزنگاری کوانتومی به بیان و توصیف کاربرد مکانیک کوانتومی برای انجام رمزنگاری و یا شکستن سیستم های رمزی و پنهانی می پردازد. مهمترین و شناخته شده ترین کاربرد رمزنگاری کوانتومی، توزیع کلید کوانتومی (qkd) است. هدف qkd استفاده از ارتباطات کوانتومی به منظور طراحی و به اشتراک گذاری یک کلید بین دو طرف است به طوریکه هیچ شخص سومی، حتی اگر تمام مخابرات و ارتباطات بین آلیس و باب را استراق سمع کند، نتواند ه...
H. Lim1, A. Virani2, A. Fok3, A. Karsan4, D. Renouf1, K.A. Gelmon5, S. Yip6, S. Chia7, S. Sun1, A. Tinker1, S.J. Lee8, R. Rassekh9, R. Deyell9, R. Roscoe3, S. Jones3, E. Pleasance3, M. Marra3, J. Laskin1 Medical Oncology, British Columbia Cancer Agency, Vancouver, BC, CANADA Ethics, BC Children’s and Women’s Hospital, Vancouver, BC, CANADA Genome Sciences Centre, BC Cancer Agency, Vancouver, BC...
Action languages are formal models of parts of natural language that are designed to describe effects of actions. Many of these languages can be viewed as high level notations of answer set programs structured to represent transition systems. However, the form of answer set programs considered in the earlier work is quite limited in comparison with the modern Answer Set Programming (ASP) langua...
Gershtein S. In the framework of potential models for heavy quarkonium the mass spectrum for the system (¯ bc) is considered. Spin-dependent splittings, taking into account a change of a constant for effective coulomb interaction between the quarks, and widths of radiative transitions between the (¯ bc) levels are calculated. In the framework of QCD sum rules, masses of the lightest vector B * ...
hydrotactic. Alternatively, cells may rely on sensing parameters that vary with desiccation, such as salinity, temperature or the presence of other chemical species. We have also seen this behaviour in other desert-soil cyanobacteria — for example, the common Microcoleus vaginatus . If it is widespread among prokaryotes, this response may be crucial for survival and dispersal in terrestrial env...
two vessels from different sites of the iranian plateau, dating to the late 4th or early 3rd millennium bce are presented aspalaeotechnological case studies. in the fractures of the vessels’ walls, interfaces left by added clay parts (enhanced inthe two illustrations) are quite recognizable. it is proposed that in both cases potters, in order to construct the bases, usedto make bowls comparable...
principle that most of us are linked by short chains of acquaintances — was first investigated as a question in sociology and is a feature of a range of networks arising in nature and technology. Experimental study of the phenomenon revealed that it has two fundamental components: first, such short chains are ubiquitous, and second, individuals operating with purely local information are very a...
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