共查询到20条相似文献,搜索用时 46 毫秒
1.
The investigation was made of the dependence of the intensity of Tl, Ga, Mo, Mg, Mn, Sn, Bi, Ni, Zn, Pt and Au spectral lines and the plasma parameters (temperature T, electron concentration ne, degree of 6 ionnization α) from concentration of lithium additive. 相似文献
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Technical Physics - The object of this work is the apokamp—a new type of plasma jet, which is formed from a bright offshoot emerging at the bending point of a channel of a high-voltage... 相似文献
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J. Šlechta 《Czechoslovak Journal of Physics》1968,18(10):1299-1308
On the basis of the classical theory of radiation produced in incomplete Coulomb interaction, a formula is derived for the coefficient of the bremsstrahlung of fully ionized plasma. In the region of rectilinear approximation a comparison is made with the results of the quantum formula derived from the Born approximation. Furthermore, the influence of dispersion upon the emission coefficient is taken into account; some relations for the region of dispersion are given. 相似文献
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J. Adrián Espínola-Rocha 《Physics letters. A》2008,372(40):6161-6167
We show the scattering matrix associated to the Manakov-Zakharov-Shabat (MZS) system can be factorized as the product of two scattering matrices associated to the Zakharov-Shabat (ZS) system of the Nonlinear Schrödinger (NLS) equation, whenever the initial conditions of the Manakov system have disjoint support. Moreover, if these initial conditions are assumed to be single-lobe, the eigenvalues of the MZS system are purely imaginary. 相似文献
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R. A. Vadov 《Acoustical Physics》2005,51(3):265-270
The disagreement between the experimental and calculated positions of the first convergence zone are known from many publications. The most probable cause for such a disagreement, namely, the incorrect specification of the input data for the calculations, is considered. The lack of simultaneity between the hydrological surveys of the region and the acoustic experiments is emphasized. The experimental data obtained by the author in five ocean regions are presented. These data characterize the diurnal variability of the distance from the source to the nearest boundary of the convergence zone. The relations proposed by different researchers for calculating the sound speed from the temperature, salinity, and hydrostatic pressure are analyzed. It is shown that these relations lead to a substantial difference in the estimated depth dependence of the hydrostatic gradient of the sound speed. The position of the first convergence zone is calculated for the propagation conditions determined by vertical temperature and salinity profiles with the subsequent recalculation of these profiles into sound speed profiles by using eight different formulas known from the literature. It is shown that different formulas lead to different values of the distance to the first zone; this difference is substantially greater than that between the calculations and experiment. The necessity of improving the recalculation relations in view of the experimental data on sound propagation in natural oceanic waveguides, including the data on the actual positions of the convergence zones, is emphasized. 相似文献
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L. E. Zhmur 《Radiophysics and Quantum Electronics》1972,15(4):367-371
One-dimensional nonisothermal diffusion in ionospheric plasma (the F-region) is considered in the stationary case. The analysis is carried out for two species of positive ions with allowance for the ionization and recombination processes and the effect of gravity. A system of two coupled equations is derived for the concentrations of the electrons and ions. A transition is made to the case when the ions which determine dissociative recombination are impurity ions. For this case criteria are presented whose fulfilment causes the distribution that has been found to coincide with that obtained by Mange [9] without allowance for photochemical processes. 相似文献
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S. S. Anan’ev S. A. Dan’ko Yu. G. Kalinin Fan Ye Yi Qin Shuqing Jiang Feibiao Xue Zhenghong Li Jianlun Yang Rongkun Xu 《JETP Letters》2010,92(11):735-741
The dynamics of the hot component of the plasma of imploding multiwire arrays has been analyzed using the time behavior of
the X-ray spectral lines of multicharge ions. The spectra of H- and He-like aluminum ions with nanosecond time resolution
have been detected using electron-optical chronography in experiments on the implosion of multiwire arrays by mega-ampere
currents. The simultaneous appearance of the resonance lines of H- and He-like ions implies that the hot plasma whose electron
temperature is higher than 0.5 keV has existed on the axis before the implosion of the main mass of the liner. The further
dynamics of the intensity of the lines is primarily attributed to an increase in the mass of the emitting plasma. 相似文献
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Denis de Carvalho Braga 《Physics letters. A》2010,374(42):4316-4320
In this note we present an analytical study of the stability of the equilibria of the Rikitake system. We prove that the two non-hyperbolic equilibria of the Rikitake system are unstable for all positive values of the parameters. 相似文献
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L. A. Bureeva M. B. Kadomtsev M. G. Levashova V. S. Lisitsa A. Calisti B. Talin F. Rosmej 《JETP Letters》2010,90(10):647-650
A new expression for the Stark profiles of spectral lines in plasma has been obtained by the method of the kinetic equation
taking into account the dynamics of the plasma microfield. The result represents a dynamic line profile in the form of simple
functionals of a static profile. The relation of the new solution with the known fluctuating-frequency method has been analyzed.
It has been shown that this method is a discrete analog of the method of the kinetic equation and passes to the latter method
in the limit of the continuous fluctuations. Simple formulas (4), (5), and (21) for dynamic line profiles provide ultrafast
calculations of the profiles of spectral lines taking into account the dynamics of the plasma microfield. 相似文献
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V. G. Ksenzov 《Physics of Atomic Nuclei》2008,71(4):756-758
It is shown that a modification of the effective potential proposed by A.A. Migdal and Shifman makes it possble to calculate the vacuum condensates of the trace of the energy-momentum tensor in massless theories in various spacetime dimensions. 相似文献
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The relative contributions of optical aberrations of the cornea and the crystalline lens to the final image quality of the human eye were studied. The aberrations of the entire eye were obtained from pairs of double-pass retinal images, and the aberrations of the cornea were obtained from videokeratographic data. Third-order spherical aberration and coma were significantly larger for the cornea than for the complete eye, indicating a significant role of the lens in compensating for corneal aberrations. In a second experiment retinal images were recorded in an eye before and after we neutralized the aberrations of the cornea by having the subjects wear swimming goggles filled with saline water, providing a direct estimate of the optical performance of the crystalline lens. 相似文献
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E. D. Éidel’man 《Technical Physics》1998,43(11):1275-1279
A theory is developed for a new type of transition — a change in the ratio of the longitudinal and transverse dimensions of
a convection cell as the thickness of a liquid layer is varied. A sudden change in the ratio of the cell dimensions takes
place because of a change in the predominant mechanism for excitation of convection. The governing influence of buoyancy forces
gives way to one of thermocapillary forces, and they in turn give way to the influence of thermoelectric forces for yet thinner
layers. As the layer thickness is reduced gradually at a fixed external heating, the ratio of the dimensions will take on
the values 0.7, 0.65, and 1, respectively.
Zh. Tekh. Fiz. 68, 7–11 (November 1998) 相似文献
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We study the Cauchy problem for the Whitham modulation equations for increasing smooth initial data. The Whitham equations are a collection of one-dimensional quasi-linear hyperbolic systems. This collection of systems is enumerated by the genus g=0,1,2, ... of the corresponding hyperelliptic Riemann surface. Each of these systems can be integrated by the so-called hodograph transformation introduced by Tsarev. A key step in the integration process is the solution of the Tsarev linear overdetermined system. For each g>0, we construct the unique solution of the Tsarev system, which matches the genus g+1 and g–1 solutions on the transition boundaries. 相似文献
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B. Buliński K. Malinowski A. Michalik P. Niżegorodcew 《Isotopes in environmental and health studies》2013,49(7):261-265
The present paper makes an attempt of the interpretation of the tracer measurements by means of transfer function. Obtained data of residence time of catalyst in xylene isomerization column inserted in previous paper [1] were used to the identification of dynamic properties of individual sections of the column. 相似文献
19.
We obtain the solution to the problem of the skin effect in a metal with specular-diffusion boundary conditions for arbitrary
values of the anomaly parameter in the form of the Neumann series. For this purpose, we develop a method based on the idea
of representation of not only the boundary condition imposed on the field (as is conventionally done), but also the boundary
condition imposed on the distribution function, in the form of a source. The specular reflectance is an arbitrary function
of the angle of incidence of electrons on the metal surface. 相似文献
20.
We reanalize the recently proposed proof by Jensen and Stein-Schabes [1] of the No Hair Theorem for inhomogeneous spacetimes, putting a special emphasis on the asymptotic behaviour of the shear and curvature. We conclude that the theorem only holds locally and estimate the minimum size a region should be in order for it to inflate. We discuss in some detail the assumptions used in the theorem. In the last section we speculate about the possible measure of the set of spacetimes that would undergo inflation. 相似文献