Observation of ion wave streamers and low frequency sheath instability by the resonant absorption due to nonlinear interaction of microwave-plasma

2004 ◽  
Vol 11 (2) ◽  
pp. 836-843 ◽  
Author(s):  
Md. Kamal-Al-Hassan ◽  
Mikhail Starodubtsev ◽  
Hiroaki Ito ◽  
Noboru Yugami ◽  
Yasushi Nishida
Keyword(s):  
Nonlinear Interaction ◽  
Microwave Plasma ◽  
Low Frequency ◽  
Resonant Absorption

scholarly journals Nonlinear interaction between acoustic gravity waves

1996 ◽  
Vol 14 (3) ◽  
pp. 304-308 ◽  
Author(s):  
P. Axelsson ◽  
J. Larsson ◽  
L. Stenflo
Keyword(s):  
Gravity Waves ◽  
Nonlinear Interaction ◽  
Low Frequency ◽  
Resonant Interaction ◽  
Coupling Coefficients ◽  
Symmetric Form ◽  
Frequency Limit ◽  
Acoustic Gravity Waves

Abstract. The resonant interaction between three acoustic gravity waves is considered. We improve on the results of previous authors and write the new coupling coefficients in a symmetric form. Particular attention is paid to the low-frequency limit.

Electrochemical effects in metal1 – a-Si:H – metal2 structures

1990 ◽  
Vol 68 (12) ◽  
pp. 1396-1402 ◽  
Author(s):  
Louis Paquin ◽  
Gervais Leclerc ◽  
M. R. Wertheimer
Keyword(s):  
Microwave Plasma ◽  
Short Circuit ◽  
Low Frequency ◽  
Short Circuit Current ◽  
Open Circuit ◽  
Elastic Recoil ◽  
Galvanic Cells ◽  
Detection Analysis ◽  
Morphological Studies ◽  
Scanning Transmission

In the course of studying microwave plasma-deposited a-Si:H, some M1 – a-Si:H – M2 structures (where M1, and M2 represent dissimilar metals) exhibited a behavior similar to that of galvanic cells. For many pairs of metallic electrodes we have observed, in the dark, an open-circuit voltage (Voc) and a short-circuit current (Isc) that were stable over a period of several months. Such effects have been variously reported for M1–polymer–M2 cells, where no doubt remains as to their electrochemical origin. We describe here the observed phenomena, along with results from chemical profiling (elastic recoil detection analysis and Auger electron spectroscopy) studies, aging characterization by Fourier transform infrared spectroscopy, morphological studies by scanning transmission electron microscopy, low-frequency permittivity measurements, and I–V behavior in the dark and under illumination, and we interpret these results in terms of electrochemical reactions.

Filamentation and collapse of Langmuir waves in a weak magnetic field

1982 ◽  
Vol 28 (1) ◽  
pp. 19-36 ◽  
Author(s):  
P. Rolland ◽  
S. G. Tagare
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Small Angle ◽  
Nonlinear Interaction ◽  
High Frequency ◽  
Weak Magnetic Field ◽  
Low Frequency ◽  
Langmuir Waves ◽  
The Magnetic Field

The filamentation and collapse of Langmuir waves in a weak magnetic field are analysed in two particular cases of low-frequency acoustic perturbations: (i) adiabatic perturbations which correspond to subsonic collapse, and (ii) nonadiabatic perturbations which correspond to supersonic collapse. Here the existence of Langmuir filaments and Langmuir collapse in a weak magnetic field are due to nonlinear interaction of high-frequency Langmuir waves (which make small angle with the external magnetic field) with low-frequency acoustic perturbations along the magnetic field.

Nonlinear interaction of electron acoustic waves with Langmuir waves in presence of magnetic field in plasmas

2014 ◽  
Vol 81 (1) ◽  
Author(s):  
Manjistha Dutta ◽  
Manoranjan Khan ◽  
Nikhil Chakrabarti
Keyword(s):  
Magnetic Field ◽  
Nonlinear Interaction ◽  
Acoustic Waves ◽  
Low Frequency ◽  
Acoustic Mode ◽  
Magnetized Plasma ◽  
Langmuir Waves ◽  
Coupled Equations ◽  
Electron Acoustic Wave ◽  
Electron Acoustic

Nonlinear interaction between Langmuir waves and Electron Acoustic Wave (EAW) is being studied in a warm magnetized plasma in presence of two intermingled fluids, hot electrons, and cold electrons while ions forming static background. Two-fluid, two-timescale theory is performed to derive modified Zakharov's equations in a magnetized plasma. These coupled equations describe low-frequency response of electron density due to high-frequency electric field along with magnetic field perturbations. Linear analysis shows coupling between acoustic mode, upper hybrid mode, and cyclotron modes. These modes are found to be modified due to the presence of two electron components. These equations are significant in the context of weak and strong turbulence.

Mode-Decomposed Equation Diagnosis for Atmospheric Blocking Development

2019 ◽  
Vol 76 (10) ◽  
pp. 3151-3167 ◽  
Author(s):  
Takuya Aikawa ◽  
Masaru Inatsu ◽  
Naoto Nakano ◽  
Tetsuya Iwano
Keyword(s):  
North Atlantic ◽  
Nonlinear Interaction ◽  
Low Frequency ◽  
Atmospheric Blocking ◽  
Separation Boundary ◽  
The North ◽  
Mode Separation ◽  
Hemisphere Winter ◽  
Blocking Index ◽  
The North Pacific

Abstract This paper proposes a new method to identify atmospheric blocking development without the time filtering used in previous studies. A mode-decomposed vorticity equation is formulated from the principal components (PCs) of 500-hPa geopotential height by applying a new idea; the orthonormality of PCs allows any variable to be decomposed into a projection corresponding to the PCs. To test this, sectorial blocking episodes in Northern Hemisphere winter were identified by Barriopedro’s method. A blocking index was defined for each longitudinal range as the linear combination of the 10 largest PCs by means of the composite for the blocking episodes. Blocking development was diagnosed, in terms of the low modes of PC1–PC10 and the high modes of PC11–PC50. The results suggest that the intensification of blocking over the North Pacific and Eurasia is associated with nonlinear interaction among high modes, whereas the intensification (decay) of North Atlantic blocks is related mainly to enhanced nonlinear interaction among low-frequency (high-frequency) eddies. This main result is insensitive to the choice of definition for blocks and the choice of the mode separation boundary.

Vibration-Induced Loosening and Tightening of Threaded Fasteners

1995 ◽  
Author(s):  
Daniel P. Hess
Keyword(s):  
Dynamic Model ◽  
Nonlinear Interaction ◽  
Low Frequency ◽  
Harmonic Vibration ◽  
Static Equilibrium ◽  
Equilibrium Conditions ◽  
System Parameters ◽  
Threaded Fasteners

Abstract Previous analyses of threaded fasteners under vibration are based on static equilibrium conditions with supporting data limited to low frequency loading. Such analyses predict only a net loosening action. This paper presents a dynamic model of a single-bolt assembly with moderate pre-load subjected to axial harmonic vibration. Simulations with this model predict that threaded fasteners can, on the average, loosen or tighten in the presence of vibration; and that the applied vibration, as well as other system parameters, can be tuned so that either action occurs. The model elucidates the nonlinear interaction of friction and vibration of such systems. Measurements from a single-bolt assembly apparatus are presented and compared with the simulations.

Nonlinear interaction of electrostatic ion-cyclotron and drift waves in plasmas

1996 ◽  
Vol 56 (1) ◽  
pp. 187-191 ◽  
Author(s):  
O. A. Pokhotelov ◽  
L. Stenflo ◽  
P. K. Shukla
Keyword(s):  
Nonlinear Interaction ◽  
Ponderomotive Force ◽  
Modulational Instability ◽  
Low Frequency ◽  
Drift Waves ◽  
Nonlinear Coupling ◽  
Constant Amplitude ◽  
Ion Cyclotron Waves ◽  
Ion Cyclotron ◽  
Model Equations

Model equations describing the nonlinear coupling between electrostatic ion-cyclotron and drift waves are derived, taking into account the action of the low-frequency ponderomotive force associated with the ion-cyclotron waves. It is found that this interaction is governed by a pair of equations, which can be used for studying the modulational instability of a constant amplitude ion-cyclotron wave as well as the dynamics of nonlinearly coupled ion-cyclotron and drift waves.

Nonlinear interaction of electrostatic surface waves in a semi-infinite plasma. Part 1. Derivation of the coupled mode equations

1981 ◽  
Vol 26 (2) ◽  
pp. 217-230 ◽  
Author(s):  
V. Atanassov ◽  
R. Mateev ◽  
I. Zhelyazkov
Keyword(s):  
Surface Waves ◽  
Nonlinear Interaction ◽  
High Frequency ◽  
Low Frequency ◽  
Density Perturbation ◽  
Coupled Mode ◽  
Hybrid Nature ◽  
Bulk Waves ◽  
Amplitude Attenuation

We have derived a set of coupled mode equations which govern the nonlinear interaction of three high-frequency electrostatic surface waves through a low-frequency density perturbation produced by them. The set is compared with that obtained when a similar problem is solved for bulk waves in an infinite plasma. Some differences are shown to exist caused by the specific features of surface waves such as the amplitude attenuation normal to the interface and their hybrid nature.

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