نتایج جستجو برای: uniform theory of diffraction
تعداد نتایج: 21233973 فیلتر نتایج به سال:
In thb paper, we study the problem of drawing a graph in the plane so that edger appear aa straight lines and so that the "um angle formed by any pair of incident edges is " k e d . We define the rerolution of a layout to be the s t e of the minimum &e fonned by incident edges of the graph, and the resolution of a graph to be the d u m raohtion of any layout of the graph. We characterise the re...
We derive the novel asymptotic solutions for the scattered field when a cylindrical wave is incident on a coated conducting cylinder with a thin lossy dielectric material. We show that the extended UTD (uniform geometrical theory of diffraction) solution and the modified UTD solution derived by retaining the second order term are uniformly applicable in the transition region near the shadow bou...
In this paper, we present the design and evaluation of a system that automatically constructs accurate radio maps for both devicebased and device-free WLAN localization systems. The system uses 3D ray tracing enhanced with the uniform theory of diffraction (UTD) to model the electric field behavior and the human shadowing effect.
The Application of Ray Tracing and the Geometrical Theory of Diffraction to Indoor Channel Modelling
Ray tracing and the Geometrical Theory of Diffraction are applied to a simulation of the radio channel experienced by equipment communicating inside buildings. Comparisons are made between the simulated results and electromagnetic measurements through the use of probability distributions fitted to the data. System parameters are determined from the simulation, and used to recreate the channel i...
introduction: diabetes mellitus is an growing national and international public health concern. the number of people affected by diabetes in world by 2030 will be 69% in developing countries. regular physical activity plays a key role in the management of type 2 diabetes melitus, particularly glycemic control. it has been recommended that peoples with type 2 diabetes participate in moderate-int...
w. a. dudek, m. shahryari, representation theory of polyadic groups, algebra and representation theory, 2010. و a. borowiec, w. a. dudek, s. duplij, bi-element representations of ternary groups, comminications in algebra 34 (2006). هدف اصلی این پایان نامه، معرفی نمایش های گروه های n-تایی و بررسی ویژگی های اصلی آن ها با تمرکز روی گروه های سه تایی است.
previous studies have aimed at testing a hypothesis but the present study is data-first research in which researcher tries to form a theory from data rather than the use of data to test a hypothesis. this study aims at exploring teachers perceptions of the strengths and weaknesses of the current syllabus for college preparatory course. eight experienced teachers were selected to collect data du...
let h be a separable hilbert space and let b be the set of bessel sequences in h. by using several interesting results in operator theory we study some topological properties of frames and riesz bases by constructing a banach space structure on b. the convergence of a sequence of elements in b is de_ned and we determine whether important properties of the sequence is preserved under the con...
tennessee williams (1911-1983), the modern american dramatist, had his own unique school of dramaturgy. the dramas which he depicted are populated by characters who are lonely, desperate, in anxiety, alienated and in one word lost. they face challenges which they may overcome or not, through the choices they make. all these moods and conditions are clearly seen and explained in the theory of ex...
the present paper investigates how far ideologies can be tease out in discourse by examining the employed schemata by two ideologically opposed news media, the bbc and press tv, to report syria crisis during a period of nine months in 2011. by assuming that news is not a valuefree construction of facts and drawing on micro structural approach of schema theory, for the first time in discours...
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