نتایج جستجو برای: energy spectrum

تعداد نتایج: 862696  

H. A. Najari H. A. ShafieiGol,

In this research, structural and electronic properties of ZnCdn-1Ten clusters (n=1-10) have been studied by formalism of density functional theory and using the projector augmented wave within local density approximation. The structural properties (such as bond length/angle and coordination number), electronic and optical properties (such as binding energy, Kohn-Sham spect...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تبریز - دانشکده برق و کامپیوتر 1392

سیستم های طیف گسترده(spread spectrum) امروزه به طور وسیعی مورد استفاده قرار می گیرند. این سیستم ها ابتدا توسط ارتش آمریکا و در طی جنگ جهانی دوم مورد استفاده قرار گرفت. در سیستم های طیف گسترده دنباله خطی (direct sequence spread spectrum) سیگنال داده در یک دنباله شبه نویز ضرب می شود تا پهنای باند افزایش یابد. در گیرنده نیز سیگنال دریافتی پس از دمدولاسیون در یک دنباله شبه نویز همانند دنباله موجود ...

سید ظفرالله کلانتری, , محمد هادی پیراحمدیان ‌, ,

  Studies on exotic atoms are important in different ways. They are important for strong interaction with nucleus and the theory of QCD in low energies. They are also important in muon catalyzed fusion (µCF). Their properties can be revealed by studies on cascade of muonic atoms. In this paper, unlike the others, we do not consider the kinetic energy of muonic atoms, constant (the kinetic energ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سیستان و بلوچستان 1390

a one dimensional dynamic model for a riser reactor in a fluidized bed catalytic cracking unit (fccu) for gasoil feed has been developed in two distinct conditions, one for industrial fccu and another for fccu using various frequencies of microwave energy spaced at the height of the riser reactor (fccu-mw). in addition, in order to increase the accuracy of component and bulk diffusion, instanta...

2001
Tsunehiko Araki Makoto Tsubota Sergey K. Nemirovskii

The energy spectrum of superfluid turbulence in the absence of the normal fluid is studied numerically. In order to discuss the statistical properties, we calculated the energy spectra of the 3D velocity field induced by dilute and dense vortex tangles respectively, whose dynamics is calculated by the BiotSavart law. In the case of a dense tangle, the slope of the energy spectrum is changed at ...

Journal: :Physical review letters 2002
Peter Constantin

We consider the energy spectrum of a quasigeostrophic model of forced, rotating turbulent flow. We provide a rigorous a priori bound E(k)<or=Ck(-2) valid for wave numbers that are smaller than a wave number associated with the forcing injection scale. This upper bound separates this spectrum from the Kolmogorov-Kraichnan k(-5/3) energy spectrum that is expected in a two-dimensional Navier-Stoke...

2009
G. E. Volovik

We discuss the problem of the spectral function of vacuum energy. In traditional approach the ultraviolet divergencies of the vacuum energy are cancelled by imposing relations between different quantum fields and their masses. The emergent theories suggest that the microscopic degrees of the underlying quantum vacuum add to the spectral function and their contribution cancels the diverging zero...

2002
J. A. Hunt D. B. Williams

Electron energy-loss spectroscopy (EELS) in the scanning transmission electron microscope (STEM) is a powerful method for analyzing elemental, chemical, dielectric, and other information. The technique can be extended to produce quantitative images useful for interpreting the spatial distribution of this information. This paper describes an implementation of a new method of quantitative mapping...

حسین آفریده, , رحیم کوهی فائق, , رضا ایزدی نجف‌آبادی, ,

  In the experimental section of this project, the energy spectrum of fast neutrons is measured, after being passed through large blocks, approximately lm3 each, of graphite, aluminium, water and paraffin. Neutrons were produced via 7Li(p,n)7Be reaction by bombarding a Lithium target with 25 or 30 MeV protons of the cyclotron at the Nuclear Research Centre for Agriculture and Medicine in Karaj....

Journal: :Journal of Cosmology and Astroparticle Physics 2017

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