Rotational Motion of a Collisional Plasma Cylinder in Radial Electric and Axial Magnetic Fields

1976 ◽  
Vol 40 (2) ◽  
pp. 562-566 ◽  
Author(s):  
Gen'ichi Horikoshi ◽  
Altaf Hussain ◽  
Tsutomu Kuroda
Keyword(s):  
Magnetic Fields ◽  
Rotational Motion ◽  
Collisional Plasma ◽  
Plasma Cylinder

Stabilization of magnetic mirror machine using rotating magnetic field

2018 ◽  
Vol 84 (5) ◽  
Author(s):  
O. Seemann ◽  
I. Be’ery ◽  
A. Fisher
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
Collisional Plasma ◽  
Rotating Magnetic Field ◽  
Magnetic Mirror ◽  
Low Density ◽  
Mirror Machine

An increase in symmetry is observed for a low density non-collisional plasma, in a simple magnetic mirror machine, due to the application of external oscillating magnetic fields of 1.5 MHz frequency. The increase in symmetry is attributed to an increase in stability of the flute mode and is dependent on the field’s polarization and trap magnetic field strength.

scholarly journals Fast Drug Release Using Rotational Motion of Magnetic Gel Beads

2008 ◽  
Vol 2008 ◽  
pp. 1-5 ◽  
Author(s):  
Tetsu Mitsumata ◽  
Yusuke Kakiuchi ◽  
Jun-Ichi Takimoto
Keyword(s):  
Drug Release ◽  
Magnetic Fields ◽  
Rotational Motion ◽  
Phosphate Buffer Solution ◽  
Fickian Diffusion ◽  
Buffer Solution ◽  
Time Profiles ◽  
Gel Beads ◽  
High Elasticity ◽  
Fast Release

Accelerated drug release has been achieved by means of the fast rotation of magnetic gel beads. The magnetic gel bead consists of sodium alginate crosslinked by calcium chlorides, which contains barium ferrite of ferrimagnetic particles, and ketoprofen as a drug. The bead underwent rotational motion in response to rotational magnetic fields. In the case of bead without rotation, the amount of drug release into a phosphate buffer solution obeyed non-Fickian diffusion. The spontaneous drug release reached a saturation value of 0.90 mg at 25 minutes, which corresponds to 92% of the perfect release. The drug release was accelerated with increasing the rotation speed. The shortest time achieving the perfect release was approximately 3 minutes, which corresponds to 1/8 of the case without rotation. Simultaneous with the fast release, the bead collapsed probably due to the strong water flow surrounding the bead. The beads with high elasticity were hard to collapse and the fast release was not observed. Hence, the fast release of ketoprofen is triggered by the collapse of beads. Photographs of the collapse of beads, time profiles of the drug release, and a pulsatile release modulated by magnetic fields were presented.

scholarly journals Rotational motion of spherical dust in plasmas with magnetic fields

2021 ◽  
Vol 28 (9) ◽  
pp. 093702
Author(s):  
L. Simons ◽  
A. Long
Keyword(s):  
Magnetic Fields ◽  
Rotational Motion

scholarly journals Magnetic Fields measured within Flames brought mechanically into Rotational Motion

Nature ◽  
1953 ◽  
Vol 172 (4388) ◽  
pp. 1054-1054 ◽  
Author(s):  
P. SCHILLING ◽  
W. LOCHTE-HOLTGREVEN
Keyword(s):  
Magnetic Fields ◽  
Rotational Motion

A FUNDAMENTAL THEORY OF THE MAGNETISM OF MASSIVE ROTATING BODIES

1951 ◽  
Vol 29 (6) ◽  
pp. 470-479 ◽  
Author(s):  
George Luchak
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Rotational Motion ◽  
Phenomenological Theory ◽  
Variable Stars ◽  
Fundamental Theory ◽  
Gravitational Fields ◽  
The Earth ◽  
The Magnetic Field ◽  
Rotating Bodies

A phenomenological theory, based on a relativistically covariant generalization of Maxwell's equations to include gravitational fields, is developed to account for the magnetic fields of massive rotating bodies. The equations yield the Wilson–Blackett expression for the magnetic moment of the earth and stars but give no magnetic field for mass-bodies moving without rotation in their own gravitational fields. They indicate that the magnetic field due to the motion of the earth in its orbit is negligibly small compared to the field due to its rotational motion, and they provide a possible explanation for the variable magnetic fields of light-variable stars.

scholarly journals Terahertz Radiation from a Plasma Cylinder with External Radial Electric and Axial Magnetic Fields

2021 ◽  
Vol 2021 ◽  
pp. 1-6
Author(s):  
L. H. Cao ◽  
Wei Yu ◽  
M. Y. Yu ◽  
C. Y. Yu
Keyword(s):  
Magnetic Fields ◽  
Cyclotron Frequency ◽  
Plasma Frequency ◽  
Axial Direction ◽  
Electron Cyclotron ◽  
Thz Radiation ◽  
Plasma Cylinder ◽  
Particle In Cell ◽  
Electron Cyclotron Frequency ◽  
Electric And Magnetic Fields

Terahertz (THz) radiation from a plasma cylinder with embedded radial electric and axial magnetic fields is investigated. The plasma density and the electric and magnetic fields are such that the electron plasma frequency is near the electron cyclotron frequency and in the THz regime. Two-dimensional particle-in-cell simulations show that the plasma electrons oscillate not only in the azimuthal direction but also in the radial direction. Spectral analysis shows that the resulting oscillating current pattern has a clearly defined characteristic frequency near the electron cyclotron frequency, suggesting resonance between the cyclotron and plasma oscillations. The resulting far-field THz radiation in the axial direction is also discussed.

Calculated Coronal Magnetic Fields and Their Comparison with the Coronal Structures as Observed during Five Solar Eclipses

1994 ◽  
Vol 144 ◽  
pp. 559-564
Author(s):  
P. Ambrož ◽  
J. Sýkora
Keyword(s):  
Magnetic Field ◽  
Solar Cycle ◽  
Magnetic Fields ◽  
Solar Corona ◽  
Coronal Magnetic Field ◽  
Coronal Magnetic Fields ◽  
Solar Eclipses ◽  
Coronal Structures

AbstractWe were successful in observing the solar corona during five solar eclipses (1973-1991). For the eclipse days the coronal magnetic field was calculated by extrapolation from the photosphere. Comparison of the observed and calculated coronal structures is carried out and some peculiarities of this comparison, related to the different phases of the solar cycle, are presented.

Radio Measurements of Coronal Magnetic Fields

1994 ◽  
Vol 144 ◽  
pp. 21-28 ◽  
Author(s):  
G. B. Gelfreikh
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Solar Corona ◽  
Active Regions ◽  
High Sensitivity ◽  
Coronal Magnetic Field ◽  
Transverse Magnetic ◽  
Radio Sources ◽  
Radio Waves ◽  
Solar Active Regions

AbstractA review of methods of measuring magnetic fields in the solar corona using spectral-polarization observations at microwaves with high spatial resolution is presented. The methods are based on the theory of thermal bremsstrahlung, thermal cyclotron emission, propagation of radio waves in quasi-transverse magnetic field and Faraday rotation of the plane of polarization. The most explicit program of measurements of magnetic fields in the atmosphere of solar active regions has been carried out using radio observations performed on the large reflector radio telescope of the Russian Academy of Sciences — RATAN-600. This proved possible due to good wavelength coverage, multichannel spectrographs observations and high sensitivity to polarization of the instrument. Besides direct measurements of the strength of the magnetic fields in some cases the peculiar parameters of radio sources, such as very steep spectra and high brightness temperatures provide some information on a very complicated local structure of the coronal magnetic field. Of special interest are the results found from combined RATAN-600 and large antennas of aperture synthesis (VLA and WSRT), the latter giving more detailed information on twodimensional structure of radio sources. The bulk of the data obtained allows us to investigate themagnetospheresof the solar active regions as the space in the solar corona where the structures and physical processes are controlled both by the photospheric/underphotospheric currents and surrounding “quiet” corona.

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