A NOTE ON WAVE PHENOMENA DUE TO A MOVING AND OSCILLATING DIPOLE IN A COMPRESSIBLE PLASMA COLUMN

1963 ◽  
Vol 41 (12) ◽  
pp. 2268-2275 ◽  
Author(s):  
M. Yildiz ◽  
S. N. Samaddar
Keyword(s):  
Plasma Column ◽  
Compressible Plasma ◽  
Wave Phenomena

scholarly journals Spectrum and stability of a rigidly rotating compressible plasma

1997 ◽  
Vol 58 (1) ◽  
pp. 101-121 ◽  
Author(s):  
R. J. NIJBOER ◽  
A. E. LIFSCHITZ ◽  
J. P. GOEDBLOED
Keyword(s):  
Magnetic Field ◽  
Continuous Spectrum ◽  
Density Profile ◽  
Plasma Column ◽  
Poloidal Magnetic Field ◽  
Compressible Plasma

We consider the spectrum and stability of a compressible, rigidly rotating plasma column with constant magnetic pitch. It is found that when the pressure on axis is zero, a continuous spectrum arises, which may become unstable. When the pressure on axis is finite or a conducting core is included, the spectrum is discrete, but may still be unstable. The instability is due to the poloidal magnetic field and/or the rotation of the cylinder in combination with the density profile. It is found numerically that the pressure stabilizes both types of instabilities.

Radiation from a ring source around a compressible plasma column

1970 ◽  
Vol 22 (1) ◽  
pp. 259-272
Author(s):  
D. K. Cheng ◽  
H. C. Chen
Keyword(s):  
Plasma Column ◽  
Compressible Plasma ◽  
Ring Source

INTERACTION OF EM WAVES WITH A COMPRESSIBLE PLASMA COLUMN

1979 ◽  
Vol 40 (C7) ◽  
pp. C7-597-C7-598
Author(s):  
Lj. R. Cander ◽  
B. V. Stanić
Keyword(s):  
Plasma Column ◽  
Compressible Plasma

Fundamentals of Wave Phenomena

2010 ◽  
Author(s):  
Akira Hirose ◽  
Karl E. Lonngren
Keyword(s):  
Wave Phenomena

Simulation of vibration piercing of pipe blank at press

2020 ◽  
Vol 76 (11) ◽  
pp. 1128-1138
Author(s):  
S. R. Rakhmanov
Keyword(s):  
High Frequency ◽  
Deformation Zone ◽  
Pipe Blank ◽  
Equipment Operation ◽  
Metal Deformation ◽  
Technological Tool ◽  
High Frequency Vibrations ◽  
Pipe Blanks ◽  
Wave Phenomena

In some cases, the processes of piercing or expanding pipe blanks involve the use of high-frequency active vibrations. However, due to insufficient knowledge, these processes are not widely used in the practice of seamless pipes production. In particular, the problems of increasing the efficiency of the processes of piercing or expanding a pipe blank at a piercing press using high-frequency vibrations are being solved without proper research and, as a rule, by experiments. The elaboration of modern technological processes for the production of seamless pipes using high-frequency vibrations is directly related to the choice of rational modes of metal deformation and the prediction resistance indicators of technological tools and the reliability of equipment operation. The creation of a mathematical model of the process of vibrating piercing (expansion) of an axisymmetric pipe blank at a piercing press of a pipe press facility is an actual task. A calculation scheme for the process of piercing a pipe plank has been elaborated. A dependence was obtained characterizing the speed of front of plastic deformation propagation on the speed of penetration of a vibrated axisymmetric mandrel into the pipe workpiece being pierced. The dynamic characteristics of the occurrence of wave phenomena in the metal being pierced under the influence of a vibrated tool have been determined, which significantly complements the previously known ideas about the stress-strain state of the metal in the deformation zone. The deformation fields in the zones of the disturbed region of the deformation zone were established, taking into account the high-frequency vibrations of the technological tool. It has been established that the choice of rational parameters (amplitude-frequency characteristics) of the vibration piercing process of a pipe blank results in significant increase in the efficiency of the process, the durability of the technological tool and the quality of the pierced blanks.

Electron-Wave Phenomena in the Composite Semiconductor Structure

2008 ◽  
Vol 67 (20) ◽  
pp. 1871-1878 ◽  
Author(s):  
V. A. Abdulkadyrov ◽  
D. V. Abdulkadyrov ◽  
E. M. Khutoryan
Keyword(s):  
Semiconductor Structure ◽  
Electron Wave ◽  
Wave Phenomena
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