نتایج جستجو برای: ‎Distribution function‎

تعداد نتایج: 1742398  

Journal: :iranian journal of science and technology (sciences) 2005
s. nadarajah

the fisher information matrix for a mixture of two pareto distributions is derived. numericaltabulations of the matrix are also provided for practical purposes. the work is motivated by a real-lifeexample.

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 1993
ali maghari hassan behnejad

a new derivation of the quantum boltzmann transport equation for the fermion system from the quantum time evolution equation for the wigner distribution function is presented. the method exhibits the origin of the time - irreversibility of the boltzmann equation. in the present work, the spin dependent and indistinguishibility of particles are also considered.

Journal: :journal of advances in computer research 0

the infomax algorithm is a popular method in blind source separation problem. in this article an extension of the infomax algorithm is proposed that is able to separate mixed signals with any sub- or super-gaussian distributions. this ability is the results of using two different nonlinear functions and new coefficients in the learning rule. in this paper we show how we can use the distribution...

Journal: :iranian journal of science and technology (sciences) 2011
s. bahrami

here, the concept of quantum potential that has been illustrated in extended phase space (eps) in previous works is explored for its marginal behavior. unlike in configuration space, different representations of the quantum mechanics can be found in eps when exploiting appropriate canonical transformations. these canonical transformations revealed that there exist several representations in whi...

Journal: :journal of industrial engineering, international 2008
s sadeghian g.r jalali-naini

although knowing the time of the occurrence of the earthquakes is vital and helpful, unfortunately it is still unpredictable. by the way there is an urgent need to find a method to foresee this catastrophic event. there are a lot of methods for forecasting the time of earthquake occurrence. another method for predicting that is to know probability density function of time interval between earth...

Journal: :international journal of nanoscience and nanotechnology(ijnn 0
m. salehian faculty of physics and energy engineering, amirkabir university of technology, tehran, islamic republic of iran a. mohammadian department of physics, tehran central branch, islamic azad university, tehran, islamic republic of iran m. vaezzadeh department of solid state physics, faculty of physics, k. n. toosi university of technology, tehran, islamic republic of iran m. saeidi department of physics, faculty of basic sciences, shahed university, tehran, islamic republic of iran

in this paper, the effect of size on melting temperature of metallic nanoparticles (au, pb and bi) is theoretically simulated and explained. in this regard, the cause of difference in various experimental data is introduced, which is the difference between nanoparticles’ grain gaussian distribution. this volume-depended model with the help of the gaussian distribution can describe the relation ...

Journal: :international journal of communications and information technology 2011
r. abaspour m. mehrjoo s. mohanna m. rezaei

co-channel interference is a major factor in limiting the capacity and link quality in cellular communications. as the co-channel interference is modeled by lognormal distribution, sum of the co-channel interferences of neighboring cells is represented by the sum of lognormal random variables (rvs) which has no closed-form expression. assuming independent, identically distributed (iid) rvs, the...

Journal: :international journal of transportation engineereing 2014
amir reza mamdoohi mahmoud saffarzadeh siavash shojaat

existence of capacity drop phenomenon, as the difference between pre-queue and queue discharge flow rates, has been one of the controversial concepts of traffic engineering. several researches have focused on capacity drop existence and also its estimation issues. this paper aims to estimate capacity drop based not only on a comparison between breakdown and queue discharge flow rates, but also ...

Journal: :iranian journal of science and technology (sciences) 2014
s. m. dehnavi

the square map is one of the functions used in cryptography. for instance, the square map is used in rabin encryption scheme, block cipher rc6 and stream cipher rabbit, in different forms. in this paper, we study statistical properties of the output of the square map as a vectorial boolean function. we obtain the joint probability distribution of arbitrary number of the upper and the lower bits...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه ارومیه 1377

the methods which are used to analyze microstrip antennas, are divited into three categories: empirical methods, semi-empirical methods and full-wave analysis. empirical and semi-empirical methods are generally based on some fundamental simplifying assumptions about quality of surface current distribution and substrate thickness. thses simplificatioms cause low accuracy in field evaluation. ful...

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