نتایج جستجو برای: plasma wave

تعداد نتایج: 565722  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه قم - دانشکده علوم پایه 1390

چرخش و پلاسمایی بودن پوش ستاره از عوامل مهم در تحول آن در فاز انقباضی هستند. برار نشان دادن این موضوع مدلی از تحول ستاره را میتوان ارائه کرد که در تطابق زیادی با مشاهدات دارد و برای هر ستاره با هر جرم قابل استفاده است. ستاره را به دو قسمت پوشو هسته تقسیم کرده ایم و همانطور که چرخش نقش اصلی در تشکیل ستاره دارد یک دوران اولیه به ستاره نسبت داده ایم. در این مدل اساس کار بر افزایش سرعت زاویه ای هست...

Journal: interface and thin films 2018

In this study, we investigate the transparency of an overdense inhomogeneous plasma slab. This anomalous transmission is achieved when the conditions provided for the incident electromagnetic wave to excite coupled surface waves on the both sides of the slab. These conditions require that the homogeneous overdense plasma, or the metallic film, is placed between two dielectric layers. Here, the ...

Shokri, B. ,

The distribution function of the electrons produced in the interaction between an intense electromagnetic wave and a neutral gas is derived and is shown to be nonequilibrium and anisotropic. By assuming that the time scale of gas ionization is much greater than the field period, it is shown that the electron distribution function formed in microwave and optical discharges has sharp anisotropy a...

We have studied the electron exchange-correlation effect on thecharacteristics of the two-component unmagnetized dense quantum plasma withstreaming motion. For this purpose, we have used the quantum hydrodynamic model(including the effects of a quantum statistical Fermi electron temperature) for studyingthe propagation of an electrostatic electron plasma waves in such th...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شهید بهشتی - دانشکده علوم 1386

چکیده ندارد.

محسن سربیشه‌ای, , مرضیه متقی‌زاده, , پروین اسلامی, ,

  In this paper, we first study the conditions for the existence of the solitonic solutions in ion-electron-positron plasma. Then we investigate the effect of increasing positron on the solitonic wave properties, We also consider the time evolution of these waves in passing through the boundaries of two plasma with different positron densities and different positron-electron temperature ratios.

Journal: :the modares journal of electrical engineering 2015
fatemeh etesami farzad mohajeri

this paper presents the results of a study on the radiation characteristics of a plasma triangular antenna in the vhf band (30-300mhz) applying the method of moment. deriving the current distribution of the antenna, it shows the relationship between radiation characteristics of the plasma antenna and the plasma parameters. both theoretical and numerical results indicate that if the plasma frequ...

Alireza Abdikian, GHahraman Solookinejad Zahra Safi,

In this paper, we investigated the corrected plasmon dispersion relation for graphene in presence of a constant magnetic field which it includes a quantum term arising from the collective electron density wave interference effects. By using quantum hydrodynamic plasma model which incorporates the important quantum statistical pressure and electron diffraction force, the longitudinal plasmons ar...

Journal: :journal of optoelectronical nano structures 0
a abdikian department of physics, malayer university, malayer, iran ghahraman solookinejad department of physics, marvdasht branch, islamic azad university, marvdasht, iran

in this paper, we investigated the corrected plasmon dispersion relation for graphene in presence of a constant magnetic field which it includes a quantum term arising from the collective electron density wave interference effects. by using quantum hydrodynamic plasma model which incorporates the important quantum statistical pressure and electron diffraction force, the longitudinal plasmons ar...

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