摘要:

AbstractWith the help of an iterative method we derive a higher nonlinear evolution equation of the KdV‐type starting from the Vlasov‐Poisson system. This equation describes the amplification of ion‐acoustic solitary waves. A perturbative‐theoretical approach is given for small deviations from the 1‐soliton solution. The amplification shows an exponentiel time behaviour in t

ISSN:0005-8025    

DOI:10.1002/ctpp.19840240202

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

摘要:

AbstractA theory of the magneto‐acoustic radiation from an upper‐hybrid soliton moving in an inhomogeneous magnetoactive plasma is presented. The derived expression for the spatial distribution of the radiation field is analysed for a linear and two different parabolic density profiles. The energy flux density connected with the transversal part of the magneto‐acoustic waves is investi

ISSN:0005-8025    

DOI:10.1002/ctpp.19840240203

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

摘要:

AbstractSupposing free‐fall conditions the velocity distribution functions of atoms and ions in various levels in gas discharges at low pressures are calculated. In particular, plasmas at high degrees of ionization are considered. Solving the Boltzmann equation for the motions transverse to the wall of the discharge tube it is shown that the velocity distribution functions can considerably deviate from the Maxwellian and become non‐isotropic. Inelastic collisions with electrons and the ionization by electron impacts considerably determine the velocity distribution function of the neutral atoms. The velocity distribution function of the ions is also essentially determined by the electric field within the plasma. For the motions transverse to the wall the half widths of the velocity distribution functions do not only depend on the temperature of the wall, but on the electron density and on the electron temperature as well. At small electron densities the half widths for excited atoms and for ions can be narrower than the one for the ground state atoms. The charge exchange between atoms and ions is shortly taken into considerat

ISSN:0005-8025    

DOI:10.1002/ctpp.19840240204

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

摘要:

AbstractAdiabatic expansion of plasma behind the reflected shock front in an electromagnetic shock tube has been verified. Electron densities and temperatures have been measured spectroscopically. Assuming complete local thermal equilibrium, the specific heat ratios of hydrogen plasmas have been determined out of expansion rate per a heavy particle directly from the adiabatic expansion law. Noticeably lower values of the ratio are determined at temperatures where ionization and recombination processes are abundant. The ratios determined in this work are in excellent agreement with theoretical values determined in an earlier work.

ISSN:0005-8025    

DOI:10.1002/ctpp.19840240205

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

摘要:

AbstractA Townsend‐Huxley apparatus has been used to measure the lateral diffusion coefficient to mobility ratioD/μ in two gas mixtures of special interest when modeling h.p. CO2lasers. The results are compared with the corresponding theoretical values obtained with the conventional two‐term theory in order to assess the limits of the theoretical predictions and have indications on the accuracy of the available cross sect

ISSN:0005-8025    

DOI:10.1002/ctpp.19840240206

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

摘要:

AbstractElectric, caloric, radiation and sounding measurements are reported, which were done with an nitrogen are in strongly turbulent gas coolant flow. On the base of this measurements a power balance is established. It allows for the description of the are by a three‐zone‐model, the zones being 1. conducting are core, 2. thermal sheath containing dissociated nitrogen, 3. relatively cold coolant gas. The hot are core is gliding inside of the thermal sheath. The geometrical disturbances, discussed in a preceding paper, do so, too. The dominating power loss is by axial enthalpy flow out of the channel, carried by the dissociated nitrogen in the thermal she

ISSN:0005-8025    

DOI:10.1002/ctpp.19840240207

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

摘要:

AbstractResults of the probe and thermocouple measurements of the constricted stationary glow dis charge in nitrogen and air at pressures up to 60 Torr are given. It was shown that the main energy processes in the column are the heating of the gas and its vibrational excitation. The balance of charged particles is determined by the electron‐ion recombination and the stepwise ionization through metastable levels of nitrogen molecules. The results obtained can be used in the numerical simulation of a moving filament during the current constriction in the glow discharg

ISSN:0005-8025    

DOI:10.1002/ctpp.19840240208

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY

ISSN:0005-8025    

DOI:10.1002/ctpp.19840240201

出版商:WILEY‐VCH Verlag    

年代:1984

数据来源: WILEY