نتایج جستجو برای: time-space

تعداد نتایج: 2249142  

پایان نامه :دانشگاه آزاد اسلامی - دانشگاه آزاد اسلامی واحد تهران مرکزی - دانشکده برق و الکترونیک 1390

there are many approaches for solving variety combinatorial optimization problems (np-compelete) that devided to exact solutions and approximate solutions. exact methods can only be used for very small size instances due to their expontional search space. for real-world problems, we have to employ approximate methods such as evolutionary algorithms (eas) that find a near-optimal solution in a r...

Journal: :Journal for History of Mathematics 2015

Journal: :iau international journal of social sciences 2013
ali a. saeidi

the main objective of this paper is to argue how the mobile phones have transformed the iranian lifestyle and how the arrival of mobiles has been a catalyst for revolting behavior, and has launched a new consumer behavior and has changed our relationships. the paper explains how the people's behavior has developed a whole new social code in iran. it is argued that the social value of being able...

Journal: :Physical Review Letters 2018

In this paper, using the tight-binding model, we extend the real-space renormalization group method to time-dependent Hamiltonians. We drive the time-dependent recursion relations for the renormalized tight-binding Hamiltonian by decimating selective sites of lattice iteratively. The formalism is then used for the calculation of the local density of electronic states for a one dimensional quant...

Journal: :تحقیقات نظام سلامت 0
صدیقه رستاقی کارشناس ارشد، گروه آمار زیستی، دانشکده بهداشت، دانشگاه علوم پزشکی اصفهان، اصفهان، ایران توحید جعفری کوشکی گروه آمار زیستی، دانشکده بهداشت، دانشگاه علوم پزشکی قم، قم، ایران بهزاد مهکی استادیار، گروه آمار زیستی، دانشکده بهداشت، دانشگاه علوم پزشکی اصفهان، اصفهان، ایران یوسف بشیری کارشناس ارشد، گروه آمار زیستی، دانشکده پیراپزشکی، دانشگاه علوم پزشکی شهید بهشتی، تهران، ایران

background : the age standardized incidence rates of esophageal cancer in women and men in iran have the fifth and eighth ranks, respectively. due to the high incidence rate of esophageal cancer and the necessity of knowledge of its geographical distribution, the incidence of this cancer was mapped at province and county levels in the present study. methods: the study population of this empiric...

Journal: :iranian journal of oil and gas science and technology 0
sajedeh shahsavari assistant professor, department of chemistry, payame noor university, tehran, iran alireza ganjovi professor ,photonics research institute, institute of science and high technology and environmental sciences, graduate university of advanced technology, kerman, iran alireza ahmadi associate professor,department of mechanical engineering, graduate university of advanced technology, kerman, iran fahimeh shojaei 2 associate professor ,photonics research institute, institute of science and high technology and environmental sciences, graduate university of advanced technology, kerman, iran 3 associate professor,department of mechanical engineering, graduate university of advanced technology

in this paper, using a one-dimensional simulation model, the reforming process of sour gas, i.e. ch4, co2, and h2s, to the various charged particles and syngas in a dielectric barrier discharge (dbd) reactor is studied. an electric field is applied across the reactor radius, and thus a non-thermal plasma discharge is formed within the reactor. based on the space-time coupled finite element meth...

Journal: :journal of sciences islamic republic of iran 0

in this paper, using the tight-binding model, we extend the real-space renormalization group method to time-dependent hamiltonians. we drive the time-dependent recursion relations for the renormalized tight-binding hamiltonian by decimating selective sites of lattice iteratively. the formalism is then used for the calculation of the local density of electronic states for a one dimensional quant...

Journal: :international journal of epidemiology research 0
seyed mehdi hosseini student research committee, epidemiology dept., hamadan university of medical sciences, hamadan, i.r. iran masoud parvin student research committee, epidemiology dept., hamadan university of medical sciences, hamadan, i.r. iran masoud bahrami student research committee, epidemiology dept., hamadan university of medical sciences, hamadan, i.r. iran manoochehr karami social determinants of health research center, hamadan university of medical sciences, hamadan, i.r. iran; epidemiology dept., hamadan university of medical sciences, hamadan, i.r. iran meysam olfatifar student research committee, epidemiology dept., hamadan university of medical sciences, hamadan, i.r. iran

background and aims: one of the most common approach to understanding spatial and temporal trends of event data is to break it up into a series of time snapshots. therefore space-time cube method applied in order to portray the likely trend in occurrence of the pulmonary tuberculosis (tb) cases. methods: in this study, information of all patients with pulmonary tb recorded in surveillance syste...

Journal: :international journal of information science and management 0
zheng-quan li ph.d., department of electronic engineering , shanghai jiaotong university, shanghai, p. r. glang-rui hu ph.d., department of electronic engineering , shanghai jiaotong university, shanghai, p. r.

in this paper, we propose space-time block codes based on constituent intersectant orthogonal designs. after channel model is formulated, we studied the space-time block codes from constituent intersectant orthogonal designs. at last we made simulations for the space-time block codes from complex orthogonal design and the space-time block codes from constituent intersectant orthogonal design to...

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