Degenerate pressure driven modified nucleus-acoustic waves in degenerate plasmas

A warm degenerate plasma (containing ultra-relativistically or non-relativistically warm degenerate inertia-less electron species, non-relativistically warm degenerate inertial light nucleus species and stationary heavy nucleus species) is considered. The basic features of planar and non-planar solitary structures associated with the degenerate pressure-driven nucleus-acoustic waves propagating in such a warm degenerate plasma system are investigated. The reductive perturbation method, which is valid for small- but finite-amplitude solitary waves, is used. It is found that the effects of non-planar cylindrical and spherical geometries, non- and ultra-relativistically degenerate electron species and the temperature of degenerate electron species significantly modify the basic features (i.e. speed, amplitude and width) of the solitary potential structures associated with degenerate pressure-driven nucleus-acoustic waves. The warm degenerate plasma model under consideration is applicable not only to all cold white dwarfs, but also to many hot white dwarfs, such as DQ white dwarfs, white dwarf H1504+65, white dwarf PG 0948+534, etc.

Download Full-text

Degenerate pressure driven self-gravito-acoustic solitary waves in a self-gravitating degenerate quantum plasma system

Physics of Plasmas ◽

10.1063/1.5013138 ◽

2018 ◽

Vol 25 (2) ◽

pp. 022307 ◽

Cited By ~ 8

Author(s):

A. A. Mamun

Keyword(s):

Solitary Waves ◽

Quantum Plasma ◽

Plasma System ◽

Degenerate Pressure ◽

Pressure Driven

Download Full-text

Pressure driven long wavelength MHD instabilities in an axisymmetric toroidal resistive plasma

Plasma Physics and Controlled Fusion ◽

10.1088/1361-6587/ac3496 ◽

2021 ◽

Vol 64 (1) ◽

pp. 014001

Author(s):

J P Graves ◽

M Coste-Sarguet ◽

C Wahlberg

Keyword(s):

Acoustic Waves ◽

Rational Surface ◽

Ion Acoustic Waves ◽

Equilibrium Conditions ◽

Rational Surfaces ◽

Long Wavelength ◽

Mhd Instabilities ◽

Axisymmetric Equilibrium ◽

First Time ◽

Pressure Driven

Abstract A general set of equations that govern global resistive interchange, resistive internal kink and resistive infernal modes in a toroidal axisymmetric equilibrium are systematically derived in detail. Tractable equations are developed such that resistive effects on the fundamental rational surface can be treated together with resistive effects on the rational surfaces of the sidebands. Resistivity introduces coupling of pressure driven toroidal instabilities with ion acoustic waves, while compression introduces flute-like flows and damping of instabilities, enhanced by toroidal effects. It is shown under which equilibrium conditions global interchange, internal kink modes or infernal modes occur. The m = 1 internal kink is derived for the first time from higher order infernal mode equations, and new resistive infernal modes resonant at the q = 1 surface are reduced analytically. Of particular interest are the competing effects of resistive corrections on the rational surfaces of the fundamental harmonic and on the sidebands, which in this paper is investigated for standard profiles developed for the m = 1 internal kink problem.

Download Full-text

Degenerate pressure driven self-gravito-acoustic solitary and shock structures

Results in Physics ◽

10.1016/j.rinp.2021.105072 ◽

2021 ◽

pp. 105072

Author(s):

A A Mamun ◽

Jhorna Akter

Keyword(s):

Degenerate Pressure ◽

Pressure Driven

Download Full-text

Characterization of RF Sputtered ZnO Piezoelectric Films Using Transmission Electron Microscope

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100114050 ◽

1975 ◽

Vol 33 ◽

pp. 86-87

Author(s):

Kemining W. Yeh ◽

Richard S. Muller ◽

Wei-Kuo Wu ◽

Jack Washburn

Keyword(s):

Integrated Circuit ◽

Acoustic Waves ◽

New Technology ◽

Surface Acoustic Waves ◽

Electromechanical Properties ◽

Leading Role ◽

Saw Devices ◽

Transmission Electron ◽

High Degree

Considerable and continuing interest has been shown in the thin film transducer fabrication for surface acoustic waves (SAW) in the past few years. Due to the high degree of miniaturization, compatibility with silicon integrated circuit technology, simplicity and ease of design, this new technology has played an important role in the design of new devices for communications and signal processing. Among the commonly used piezoelectric thin films, ZnO generally yields superior electromechanical properties and is expected to play a leading role in the development of SAW devices.

Download Full-text