Transfer of electromagnetic radiation at a finite angle to the external magnetic field in a collisional plasma with large-scale irregularities

2000 ◽  
Vol 43 (1) ◽  
pp. 24-33
Author(s):  
V. G. Gavrilenko ◽  
S. S. Petrov ◽  
A. A. Semerikov ◽  
A. V. Sorokin
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Electromagnetic Radiation ◽  
Large Scale ◽  
Collisional Plasma

Exploration of the Structures of the Magnetically Induced Self-Assembly Photonic Crystals in a Solidified Polymer Matrix

2013 ◽  
Vol 634-638 ◽  
pp. 2324-2331
Author(s):  
Hai Bo Hu ◽  
Qian Wang Chen ◽  
Ran Li ◽  
Xiang Kai Kong ◽  
Jian Chen
Keyword(s):  
Magnetic Field ◽  
Photonic Crystal ◽  
External Magnetic Field ◽  
Crystal Structures ◽  
Polymer Matrix ◽  
Self Assembly ◽  
Large Scale ◽  
Solid Polymer ◽  
One Dimension ◽  
Polyacrylamide Hydrogel

The carbon-encapsulated superparamagnetic colloidal nanoparticles (SCNps) were rigidized into soft solids by embedding the SCNps into polyacrylamide hydrogel matrixes under the induction of an external magnetic field. Stabilized by the balance of attractive (magnetic) and repulsive (electrostatic) forces, the SCNps form one-dimension photonic crystal structures along the direction of the external magnetic field and further the structures are frozen into the solidified polymer matrix. The polymer matrix embedded one-dimension photonic crystal structures can strongly diffract visible light and present brilliant color in the light. This novel and soft solid polymer matrix that could be shaped and sliced not only paves a new avenue for develop novel magnetic-responsive photonic crystal materials and devices, but also provides a method to observe the magnetic-induced self-assembly structures of the SCNps in media such as polyacrylamide hydrogel matrixs as a result of the ordered structures frozen into the polyacrylamide hydrogel matrixs. So we can reveal the relationship between their structure and color, and furthermore permit a systematic exploration on magnetically induced self-assembling dynamics, colloidal crystallography which have important significance in the large-scale industrial production in the future.

scholarly journals Electromagnetic Radiation from Electrons Rotating in an Ionized Medium Under the Action of a Uniform Magnetic Field

1958 ◽  
Vol 11 (3) ◽  
pp. 424 ◽  
Author(s):  
RQ Twiss ◽  
JA Roberts
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Electromagnetic Radiation ◽  
Fast Electron ◽  
Uniform Magnetic Field ◽  
Third Harmonic ◽  
Ordinary Mode ◽  
The Third ◽  
Velocity Of Light ◽  
Limiting Case

A theory is given for the radiation from a fast electron rotating, under the action of an external magnetic field, in an ionized plasma. It is shown that, although the radiation is emitted predominantly in the extraordinary mode, the ordinary mode is also weakly excited, even in the limiting case in which the density of the background plasma is vanishingly small. At the harmonics of the gyro frequency of the fast electron the power radiated in the ordinary mode is a few per cent. of that radiated in the extraordinary mode. This ratio is independent of v0,' the velocity of the fast electron, as long as V0 is sufficiently small compared with c, the velocity of light. However, at the fundamental gyro frequency the power radiated in the ordinary mode is lower by a factor than that radiated in the extraordinary mode and indeed is significantly smaller than that radiated, in either mode, at the third harmonic.

scholarly journals Quadrature Photonic Spatial Ising Machine

2021 ◽  
Author(s):  
Wenjia Zhang ◽  
Wencheng Sun ◽  
Yuanyuan Liu ◽  
Qingwen Liu ◽  
Jiangbing Du ◽  
...  
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Large Scale ◽  
Spin Interaction ◽  
Problem Solution ◽  
Np Hard ◽  
Combinatorial Optimization Problems ◽  
Max Cut Problem ◽  
Hard Problems ◽  
Np Hard Problems

Abstract The mining in physics and biology for accelerating the hardcore algorithm to solve non-deterministic polynomial (NP) hard problems has inspired a great amount of special-purpose ma-chine models. Ising machine has become an efficient solver for various combinatorial optimization problems. As a computing accelerator, large-scale photonic spatial Ising machine have great advantages and potentials due to excellent scalability and compact system. However, current fundamental limitation of photonic spatial Ising machine is the configuration flexibility of problem implementation in the accelerator model. Arbitrary spin interaction is highly desired for solving various NP hard problems. Moreover, the absence of external magnetic field in the proposed photonic Ising machine will further narrow the freedom to map the optimization applications. In this paper, we propose a novel quadrature photonic spatial Ising machine to break through the limitation of photonic Ising accelerator by synchronous phase manipulation in two and three sections. Max-cut problem solution with graph order of 100 and density from 0.5 to 1 is experimentally demonstrated after almost 100 iterations. We derive and verify using simulation the solution for Max-cut problem with more than 1600 nodes and the system tolerance for light misalignment. Moreover, vertex cover problem, modeled as an Ising model with external magnetic field, has been successfully implemented to achieve the optimal solution. Our work suggests flexible problem solution by large-scale photonic spatial Ising machine.

scholarly journals Nonlinear Dynamo in Obliquely Rotating Stratified Electroconductive Fluid in an Uniformly Magnetic Field

2020 ◽  
Keyword(s):  
Magnetic Field ◽  
Reynolds Number ◽  
External Magnetic Field ◽  
Uniform Magnetic Field ◽  
Large Scale ◽  
Conducting Fluid ◽  
Magnetic Vortex ◽  
Small Scale ◽  
Large Scale Vortex ◽  
External Uniform Magnetic Field

In this paper, we investigated a new large-scale instability that arises in an obliquely rotating convective electrically conducting fluid in an external uniform magnetic field with a small-scale external force with zero helicity. This force excites small-scale velocity oscillations with a small Reynolds number. Using the method of multiscale asymptotic expansions, we obtain the nonlinear equations for vortex and magnetic disturbances in the third order of the Reynolds number. It is shown that the combined effects of the Coriolis force and the small external forces in a rotating conducting fluid possible large-scale instability. The linear stage of the magneto-vortex dynamo arising as a result of instabilities of -effect type is investigated. The mechanism of amplification of large-scale vortex disturbances due to the development of the hydrodynamic - effect taking into account the temperature stratification of the medium is studied. It was shown that a «weak» external magnetic field contributes to the generation of large-scale vortex and magnetic perturbations, while a «strong» external magnetic field suppresses the generation of magnetic-vortex perturbations. Numerical methods have been used to find stationary solutions of the equations of a nonlinear magneto-vortex dynamo in the form of localized chaotic structures in two cases when there is no external uniform magnetic field and when it is present.

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