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386
WAVES, CORIOLIS FORCE AND THE DYNAMO EFFECT
, 2004
"... Dynamo activity caused by waves in a rotating magneto-plasma is investigated. In astrophysical environments such as accretion disks and at sufficiently small spatial scales, the Hall effect is likely to play an important role. It is shown that a combination of the Coriolis force and Hall effect can ..."
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produce a finite α-effect by generating net helicity in the small scales. The shear/ion-cyclotron normal mode of the Hall plasma is the dominant contributor to the dynamo action for short scale motions. Subject headings: MHD — magnetic fields — stars: magnetic fields — galaxies: magnetic fields
Instability of Ion Beam Driven Electrostatic Ion-Cyclotron Waves in Collisional Magnetized Two-Ion Component Plasma
"... Abstract—We have studied the instability of electrostatic ion-cyclotron waves in collisional magnetized two-ion component plasma (light positive K+ ions and heavy positive Cs+ ions). An ion beam propagating through collisional magnetized plasma containing electrons and two positive ion components dr ..."
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of the light ion mode approaches the light ion cyclotron frequency as the heavy ion concentration is increased. It is also found that the normalized unstable mode frequencies remains unchanged with electron collision frequencies, while the growth rate is increased linearly with the electron collision
CUSPED MIRROR MAGNETIC FIELD FOR ELECTRON CYCLOTRON RESONANCE HEAVY ION SOURCE
"... Sufficient beams of Highly Charged Heavy Ions (HCHI) have been obtained in conventional electron cyclotron resonance ion sources (ECRIS) but at the cost of simplicity and economy. A cusped magnetic field (CMF) has more plasma-confining feature but a little current of HCHI’s was extracted from ECRIS ..."
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Sufficient beams of Highly Charged Heavy Ions (HCHI) have been obtained in conventional electron cyclotron resonance ion sources (ECRIS) but at the cost of simplicity and economy. A cusped magnetic field (CMF) has more plasma-confining feature but a little current of HCHI’s was extracted from ECRIS
Measurements and interpretation of normal mode attenuation
, 1978
"... Summary. Measurements of Q for modes of free oscillation provide the most accurate information about the anelastic properties of the whole Earth in the period range from 100 to 3000s. We have obtained more than 230 Q measurements, by using two different techniques. Individual LaCoste-Romberg gravime ..."
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Cited by 6 (0 self)
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Summary. Measurements of Q for modes of free oscillation provide the most accurate information about the anelastic properties of the whole Earth in the period range from 100 to 3000s. We have obtained more than 230 Q measurements, by using two different techniques. Individual La
3D Observations of Electromagnetic Ion Cyclotron Wave Propagation in a Laboratory Plasma Column
"... The propagation of Electromagnetic Ion Cyclotron Waves (EMICW’s) as launched by an antenna of small transverse scale has been studied in a laboratory plasma. Effects of the finite perpendicular size of the plasma column on the wave magnetic field pattern are observed, and their analysis is aided by ..."
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and storage of large data sets. Electromagnetic Ion Cyclotron Waves (EMICW’s) are shear Alfvén waves whose frequency, , is comparable to the ion-cyclotron frequency, ci. In this experiment, =0.9 ci. EMICW’s are found in the Earth’s auroral ionosphere and may play a role in the transport of energy from
Critical layers in shear flows
- Ann. Rev. Fluid Mech
, 1986
"... The normal mode approach to investigating the stability of a parallel shear flow involves the superposition of a small wavelike perturbation on the basic flow. Its evolution in space and/or time is then determined. In the linear inviscid theory, if ū(y) is the basic velocity profile, then a singular ..."
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Cited by 21 (0 self)
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The normal mode approach to investigating the stability of a parallel shear flow involves the superposition of a small wavelike perturbation on the basic flow. Its evolution in space and/or time is then determined. In the linear inviscid theory, if ū(y) is the basic velocity profile, then a
Three-Dimensional Electrostatic Particle Simulation of Parallel-Flow-Shear Driven Low-Frequency Plasma Instabilities
, 2003
"... Three-dimensional electrostatic particle simulations are performed in order to investigate the effects of ion and electron flows parallel to magnetic-field lines and their velocity shears on low-frequency plasma instabilities in detail. It is clarified that not only the electron flow but also the io ..."
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, parallel flow velocity shear, ion-cyclotron instability, ion-acoustic instability, electron velocity distribution function 1 It is well known that sheared plasma flows perpendicu-lar to magnetic-field lines are recognized as an important ele-ment in the transition from L to H mode confinement in fusion
Alfv6n Resonance Heating Via Magnetosonic Modes in Large Tokamaks
"... The theory of Alfvgn resonance heating of tokamaks is extended beyond the incompressible MHD model to include finite u/Oi effects, which lead to off-diagonal terms in the conductivity tensor, and compressibility, which permits the fast ~lfv6n mode. The finite frequency effects can greatly change the ..."
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the dissipation resulting from the shear Alfv6n resonance. With an appropriate choice of parameters, the dissipation can vanish allowing high-Q tsroidal eigenmodes in large tokamaks such as PLT, PLT are the first t magnetosonic (i.e., corn modes at freque at are a modest fraction of the ion-cyclotron fre uency
Repulsive normal force by an excited magneto-rheological fluid bounded by parallel plates in stationary or rotating shear mode
- Journal of Intelligent Material Systems and Structures 22
, 2011
"... ABSTRACT: This article reports results from an experimental study undertaken to determine the magnitude of the repulsive force exerted by a magnetorheological fluid on two bounding parallel and concentric plates under different magnetic field strengths. The plates are station-ary without circumferen ..."
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Cited by 1 (0 self)
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found to approach a constant value as predicted by the tilt particle chain model. Key Words: magnetorheological fluid, normal force, plate-plate geometry, shear enhancement.
Shear fracture tests of concrete
"... Symmetrically notched beam specimens of concrete and mortar, loaded near the notches by concentrated forces that produce a concentrated shear force zone, are tested to failure. The cracks do not propagate from the notches in the direction normal to the maximum principal stress but in a direction in ..."
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energy, which is found to be about 25-times larger than that for Mode I and to agree with the value predicted by the crack band model. The fracture specimen is simple to use but not perfect for shear fracture because the deformation has a symmetric component with a non zero normal stress across the crack
Results 1 - 10
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386
