Magnetic-based purification system with simultaneous sample washing and concentration

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This paper presents results from numerical modelling of BSCCO conductors performed with finite element method software. The AC losses are calculated and compared for conductors of different geometry and aspect ratio – an elliptical tape with anisotropic Jc(B) and a round wire with isotropic Jc(B), in external magnetic field of various angles. The difference in the losses of the wire and the tape is found to be significant and depends on the applied field’s magnitude and orientation. Studied is also the effe

We have measured the giant magnetoimpedance (GMI) and giant magnetoresistance (GMR) of Metglas®/Cu/Metglas trilayer stacks of micropatterned amorphous magnetic Metglas 2714a ribbons and Cu foils. We obtain roomtemperature GMI ratios [Z(0)-Z(Hs)]/Z(Hs) up to 800 % and GMR ratios [R(0)- R(Hs)]/R(Hs) up to 2400 % at frequencies of 100 kHz-10 MHz, with Hs the magnetic field where impedance and resistance saturate towards their minimum values. These high values are a direct consequence of the large dynamic relat

The additional power absorbed by the plasma can be determined from the time derivative of the total plasma energy, which can be estimated from the diamagnetic flux of the plasma using a diamagnetic loop. The main difficulty in using diamagnetic measurements to estimate the kinetic energy is the compensation of the flux measurement sensitivity to poloidal magnetic fields, which is not always easy to adjust. A method based on the temporal variations of the diamagnetic flux of the plasma during modulated elect

We report on efficient, narrow linewidth exciton recombination in GaAs/AlGaAs V-groove quantum wire light-emitting diodes at room temperature. The high efficiency is due to a selective carrier injection mechanism resulting in an estimated internal quantum efficiency of similar to 20% with an electroluminescence (EL) linewidth as narrow as 15 meV. The thermal broadening contribution to the linewidth is 6 meV due to exciton scattering with optical phonons. An analysis of the EL peak shift in a magnetic field

Magnetohydrodynamic (MHD) instabilities can limit the performance and degrade the confinement of tokamak plasmas. The Tokamak à Configuration Variable (TCV), unique for its capability to produce a variety of poloidal plasma shapes, has been used to analyse various instabilities and compare their behaviour with theoretical predictions. These instabilities are perturbations of the magnetic field which usually extend to the plasma edge where they can be detected with magnetic pick-up coils as magnetic fluctuat

Driven by antiferromagnetic quantum fluctuations on a deformable lattice, spin-Peierls systems dimerize magnetically and structurally at low temperatures. In this dimer phase all excitations with non-zero magnetization have a finite energy. The energy gain by a finite induced magnetization overcomes the energy gap at a critical magnetic field strength H-c. Above H-c, an incommensurately modulated magnetic and distortive domain wall pattern is formed. The magnetic modulation pattern and the low-energy excita

We report on time-resolved photoluminescence studies of charged and neutral excitons in a modulation doped GaAs quantum well under resonant excitation and high magnetic field. The radiative lifetime of the charged exciton is rather short, 60 ps at zero held, and is found to increase by a factor of similar to 2 up to 7 T. The short lifetimes suggest that, under magnetic field, the exciton bound in the trion is delocalized. (C) 1998 Elsevier Science B.V. All rights reserved.

The Hamiltonian formulation of the guiding centre drift orbits for three-dimensional (3D) toroidal configurations with general time-dependent electric and magnetic field structures has been extended to cover relativistic particles. For static 3D magnetic fields with nested magnetic surfaces, a mapping procedure from the equilibrium to the canonical coordinates is outlined. This transformation is shown to be so complicated that it renders impractical most applications in canonical coordinates. For magnetic c

The technique of template synthesis by electrodeposition in the parallel pores of membranes is enhanced with the alternated deposition of different metals. Filled polycarbonate or alumite membranes constitute regular arrays of embedded wires with diameters ranging from 30nm to a few μm. The composition along the wire can be varied over distances as small as a few nm. The metallic disks thus formed have the diameter of the pores and a thickness controlled by the deposition time. The separation between grains

Relaxation of the isothermoremanent magnetization has been investigated in ceramic Y-Ba-Cu-0 samples with different grain sizes. it is found that the effective pinning energy U(eff) determined at different temperatures by using relaxation data of the remanent magnetic moment M(IR) and the relationship dlnM(IR)/dln t= -kT/U(eff) has a maximum at a value of the magnetizing field H0 corresponding to the most rapid increase of M(IR) with increasing H0. A phenomenological theory based on a critical-state model h

A numerical study of the free-boundary axisymmetric (n = 0) ideal magnetohydrodynamical (MHD) motions of the EXTRAP device is presented. The dependence of stability on current profiles in the plasma and currents in the external conductors is investigated. Results are shown for linear growth-rates and nonlinear saturation amplitudes and their dependence on plasma radius as well as on the conducting shell radius. The interior region of the plasma is simulated by means of a Lagrangian Finite Element Method (FE

Magnetic-based purification system with simultaneous sample washing and concentration

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Modelling of BSCCO conductors with anisotropic and position-dependent Jc

Giant magnetoimpedance in tri-layer structures of patterned magnetic amorphous ribbons

Modulated ECH power absorption measurements using a diamagnetic loop in the TCV tokamak

Efficient, narrow linewidth excitonic emission at room temperature from GaAs/AlGaAs V-groove quantum wire light-emitting diodes

MHD stability limits in the TCV tokamak

Statics and dynamics of the magnetic soliton lattice in the high-field phase of CuGeO3

Dynamics of charged excitons in GaAs quantum wells under high magnetic field

Relativistic guiding centre drift orbits in canonical and magnetic coordinates

A new method to construct nanostructured materials of controlled morphology

Influence of the Spatial-Distribution of Trapped Magnetic-Flux on the Effective Pinning Energy of Vortices in Ceramic Y-Ba-Cu-O

Numerical Study of the Axisymmetrical Ideal Mhd Stability of Extrap