نتایج جستجو برای: kerns method
تعداد نتایج: 1630152 فیلتر نتایج به سال:
هدف از انجام این پروژه تعیین میدان تنشهای پسماند در سیلندرهای اتوفریتاژ شده است. برای اندازه گیری میدان تنش از متد سوراخکاری (hole driling method) استفاده شده است. برای اینکه ضرایب تبدیل کرنشها به تنشها اصلاح شوند پروسه سوراخکاری در نرم افزار ansys شبیه سازی شده است. این شبیه سازی هم در عملیات اتوفریتاژ و هم برای تست سوراخکاری انجام گرفته است. براساس مطالعه انجام گرفته روشی برای تعیین ض...
in this thesis, we consider a mathematical model of cancer with completely unknown parameters. we study the stability of critical points which are biologically admissible. then we consider a control on the system and introduce situations at which solutions are attracted to critical points and so the cancer disease has auto healing. the lyapunov stability method is used for estimating the un...
Siberian Arctic wetlands located within the planetary “warming hotspot” experience pronounced climate-driven vegetation cover changes. Together with warming, wetlands, which are influence of Norilsk copper and nickel industry (69.35° N, 88.12° E), have been strongly influenced by industrial pollutions (sulfur dioxide mostly) since 1940s. In addition, petroleum products release occurred in 2020 ...
over the past decades a number of approaches have been applied for forecasting mortality. in 1992, a new method for long-run forecast of the level and age pattern of mortality was published by lee and carter. this method was welcomed by many authors so it was extended through a wider class of generalized, parametric and nonlinear model. this model represents one of the most influential recent d...
the effect of the presence of perforations on he stresses of a plate is a problem which is of great interest in structural design and in the mathemattical theory of elasticity. among the many hole patterns that are likely to require consideration is the ring of equally spaced circular holes. the present worke investigates stress & strain analysis of a thin isotropic circular plate containing a ...
برای استفاده از روش تفاضلهای محدود (finite difference method) در حل عددی معادلات حاکم بر جریانهای لزج با مرزهای پیچیده، معمولا این معادلات در یک دستگاه مختصات محاسباتی که منطبق بر مرزهاست نوشته میشوند. برای این منظور میبایست ابتدا شبکه ای که رابطه بین حوزه های فیزیکی و محاسباتی جریان را مشخص میکند، محاسبه شود. هدف از انجام این تحقیق تولید یک شبکه متعامد منطبق بر مرزها در حوزه جریان دو بعدی ...
a problem of computer vision applications is to detect regions of interest under dif- ferent imaging conditions. the state-of-the-art maximally stable extremal regions (mser) detects affine covariant regions by applying all possible thresholds on the input image, and through three main steps including: 1) making a component tree of extremal regions’ evolution (enumeration), 2) obtaining region ...
Eine Möglichkeit, ein theoretisches Konzept zu validieren, ist seine Implementierung in einem Werkzeug. In diesem Papier skizzieren wir die Implementierung des PetrinetzWürfels mit Hilfe des Petrinetz-Kerns. Mit dem Petrinetz-Würfel [KW98] und dem Petrinetz-Kern [HHK98, KW99] wurden zwei Konzepte entwickelt, die jeweils einen allgemeinen Petrinetz-theoretischen Ansatz verfolgen. Der Petrinetz-K...
A great deal of research has been conducted into attitudes towards homosexuality, primarily in the United States. The most recent research shows that a majority of the American population still harbour negative attitudes towards homosexuals and homosexuality, although the size of the majority has diminished markedly over the past decade (American Enterprise Institute 2004). The Canadian, Britis...
in this research we have studied the effect of some transition-metals (cu, ag and au) substitutions on two-electron reduction potential of flavins by application of dft method. all geometries have been optimized at blyp level of theory and “6-31+g** + lanl2dz” mixed basis set. the frequency job at the same method and basis sets has been performed to obtain gibbs free energy of compounds. it h...
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