نتایج جستجو برای: frequency distribution function

تعداد نتایج: 2141696  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه علوم و فنون مازندران 0

مدل روزنه های موازی موج دار (corrugated oarallel bundle model) برای تعریف اثر ساختمان روزنه ها در نفوذ-واکنش (diffusion and reaction) در کاتالیستهای متخلخل بکار می رود. در مدل روزنه های موج دار، از یک دسته روزنه های اصلی (pore) استفاده شده است . هر یک از این روزنه های اصلی دارای یکسری عناصر روزنه می باشد که هر عنصر دارای یک شعاع تعیین شده به صورت اتفاقی از یک توزیع اندازه روزنه ها (pore size di...

Journal: :IEEE Trans. Signal Processing 1997
Franz Hlawatsch Antonia Papandreou-Suppappola Gloria Faye Boudreaux-Bartels

Part I of this paper introduced the hyperbolic class (HC) of quadratic/bilinear time-frequency representations (QTFR’s) as a new framework for constant-Q time-frequency analysis. The present Part II defines and studies the following four subclasses of the HC: • The localized-kernel subclass of the HC is related to a timefrequency concentration property of QTFR’s. It is analogous to the localize...

2001
Ahmet Kemal Özdemir Lutfiye Durak-Ata Orhan Arikan

A new algorithm is proposed to obtain very high resolution time–frequency analysis of signal components with curved time– frequency supports. The proposed algorithm is based on fractional Fourier domain warping concept introduced in this work. By integrating this warping concept to the recently developed directionally smoothed Wigner distribution algorithm [1], the high performance of that algo...

Journal: :journal of applied research in water and wastewater 2014
ehsan fadaei kermani gholam abbas barani mohamad javad khanjani

in this paper, a new framework has been developed for compatibility analysis of predictive climatic variables distribution with reference evapotranspiration (eto) in probabilistic analysis of water requirement. initially, measured monthly meteorological data of four cities of iran including kerman, shiraz, ramsar and babolsar synoptic weather station recorded from 1961 to 2003 were considered b...

Journal: :journal of biostatistics and epidemiology 0
mostafa hosseini department of epidemiology and biostatistics, school of public health and institute of public health research, tehran university of medical science, tehran, iran marziye asgari 2 department of epidemiology and biostatistics, school of public health and institute of public health research, tehran university of medical science, tehran, iran mahmood mahmoodi 1 department of epidemiology and biostatistics, school of public health and institute of public health research, tehran university of medical science, tehran, iran iraj najafi department of nephrology, shariati hospital, tehran university of medical sciences, tehran, iran

b a c k g r o u n d & aim: in many studies, the survival of patients with chronic kidney disease who are treated with peritoneal dialysis technique has been considered, while this is possible in peritoneal dialysis  patients  to switch  to another  treatment.  to achieve  more  accurate  estimation  of patient survival is necessary to examine all events. the purpose of this study is to estimate...

Journal: :journal of nanostructures 2013
v. fallahi a. khaledi-nasab

in this paper, the interaction between an oscillating dipole moment and a silver nanoparticle has been studied. our calculations are based on mie scattering theory and discrete dipole approximation(dda) method.at first, the resonance frequency due to excitingthe localized surface plasmons has been obtained using mie scattering theory and then by exciting a dipole moment in theclose proximity of...

2006
KARLHEINZ GRÖCHENIG

We discuss the most common types of weight functions in harmonic analysis and how they occur in time-frequency analysis. As a general rule, submultiplicative weights characterize algebra properties, moderate weights characterize module properties, Gelfand-Raikov-Shilov weights determine spectral invariance, and Beurling-Domar weights guarantee the existence of compactly supported test functions.

Journal: :مهندسی عمران مدرس 0
امیررضا ممدوحی دانشگاه تربیت مدرس محمود صفارزاده دانشگاه تربیت مدرس، سیاوش شجاعت دانشگاه ایالتی اوئیزیانا

capacity of a road facility as an important characteristic in transportation and traffic studies is defined as the maximum rate of flow that could be held by that facility, which has been supposed to have a constant and certain value. this assumption, although necessary for most traffic studies, has also caused some problems, like that of demand exceeding capacity in many road facilities. resea...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تحصیلات تکمیلی صنعتی کرمان - پژوهشکده برق و کامپیوتر 1390

a phase-locked loop (pll) based frequency synthesizer is an important circuit that is used in many applications, especially in communication systems such as ethernet receivers, disk drive read/write channels, digital mobile receivers, high-speed memory interfaces, system clock recovery and wireless communication system. other than requiring good signal purity such as low phase noise and low spu...

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