نتایج جستجو برای: sphere
تعداد نتایج: 40881 فیلتر نتایج به سال:
after the soviet union dissolution, a chaotic period was begun in the russia. russia lost its glory and felt disgrace. the first group of elites came to power under yeltsin; they tried to re-define russia’s identity as a european country and build a foreign policy on this baseline. therefore russia tried to become closer with the west especially with the u.s. according to their view the sovie...
In recent decades, "Public Sphere" is one of the most important concepts in political science. Jurgen Habermas the famous thinker in this approach is the first to use this concept in critical thinking, where he demonstrates how networking is used for communicative actions. Habermas has not included the Internet as an important part of his thought process in the "public sphere", however, I think...
In this study, thermal Casimir-Polder potential is calculated for an atom in the presence of a dielectric sphere using the formula given in terms of the Green’s function. Then, the limiting cases of large and small sphere are investigated. In the limiting case of a large sphere, the formula of thermal potential for an excited atom in the presence of a dielectric half-space and then a perfectly ...
In this paper, we construct the Gazeau-Klauder coherent states of a two- dimensional harmonic oscillator on a sphere based on two equivalent approaches. First, we consider the oscillator on the sphere as a deformed (non-degenerate) one-dimensional oscillator. Second, the oscillator on the sphere is considered as the usual (degenerate) two--dimensional oscillator. Then, by investigating the quan...
see through the wall radar, is a relatively new small range radar that uses electromagnetic waves to detect targets behind wall. because of its symmetry, a conducting sphere is often used as a reference scatterer to calibrate radars. in this paper, to simulate received signal for see through the wall radar, scattering model of a conducting sphere in free space is presented. then using a dielect...
In this paper a transient free convection flow around a sphere with variable surface temperature and embedded in a porous medium has been considered. The temperature of the sphere is suddenly raised and subsequently maintained at values that varies with position on surface. The method of asymptotic expansions is applied for small Rayleigh numbers and then a finite-difference scheme is used to s...
In this paper, by using the nonlinear coherent states on a sphere, we introduce superposition of the aforementioned coherent states. Then, we consider quantum optical properties of these new superposed states and compare these properties with the corresponding properties of the nonlinear coherent states on the sphere. Specifically, we investigate their characteristics function, photon-number d...
In medical etiquette and ethics, benefit and harm assessment includes risk evaluation, rational risk, distinction between medical and non medical utilitarian considerations, individual and community benefit ratio, and issues of the like. This article explores philosophical foundations of this issue. In philosophy, benefit/harm reduces to pleasure/pain and good/bad. Pleasure (spiritual and non-...
یکی از روش های اسپکترومتری نوترون استفاده از سیستم اسپکترومتر چند کروی bonner می باشد. اسپکترومترهای bonner sphere به طور گسترده در شیوه های حفاظت پرتو برای تعیین توزیع طیف نوترون در شتابدهنده های ذرات و چشمه های مجهول و دیگر کاربردهای هسته ای استفاده می شوند. این سیستم به دلیل سادگی، قابلیت حمل ونقل، داشتن پاسخ همسانگرد، پوشش دادن پهنه ی وسیعی از انرژی و قابلیت تفسیر و بازیابی داده ها برای اسپ...
In this article we first introduce the weighted density approximation (WDA) to study the classical inhomogeneous system such as inhomogeneous fluids. Then we introduce the modified weighted density approximation (MWDA) to calculate the structure and thermodynamical properties of the FCC hard sphere crystal. The MWDA is a self consistent method where the free energy is expressed as an unperturb...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید