Electron-beam bifurcation in the field of an open cavity
Electron-beam bifurcation in the field of an open cavity
Yu.K. Alekseev, A.I. Kostienko
Current density modulation has been examined for a broad strip beam in the field of an open cavity. An expression has been obtained for the spectrum of the convection current at the output from the modulator with allowance for the beam bifurcation in the standing-wave field. Averaging the harmonic amplitudes over the beam cross section shows that the bifurcation only slightly reduces the mean energy stored in the beam at the modulating frequency.
Show AbstractThe ratio of the external and internal perimeters of a percolation cluster
The ratio of the external and internal perimeters of a percolation cluster
I.M. Sokolov
The topological features of percolation clusters are used with similarity arguments to derive an asymptotic dependence of the ratio of the external and internal perimeters for a very large finite cluster on the diameter.
Show AbstractReduced efficiency in induced Raman scattering excitation in a cavity under conditions of induced Mandelshtam-Brillouin mode interaction
Reduced efficiency in induced Raman scattering excitation in a cavity under conditions of induced Mandelshtam-Brillouin mode interaction
O.M. Vokhnik, I.V. Zykanova, V.I. Odintsov, L.P. Rogacheva
It has been shown from theory and experiment that induced Mandelshtam-Brillouin longitudinal-mode interaction in the cavity involved in induced Raman scattering excitation may lead to a considerable reduction in the pumping conversion factor and to increase in the Raman scattering line width.
Show AbstractEffects of radiation defects due to the $(n, \gamma)$ reaction on the hyperfine interaction of $^{181}Ta$ in $YFe_2$
Effects of radiation defects due to the $(n, \gamma)$ reaction on the hyperfine interaction of $^{181}Ta$ in $YFe_2$
M.D. Bondar'kov, M. Budzinski, A.A. Sorokin, L.G. Shpin'kova
Measurements have been made by the perturbed angular $\gamma \gamma$ correlation method, which have shown that the magnetic fields at the $^{181}Ta$ a nuclei at regular nodes in the Y sublattice differ from those at the defective positions produced by $(n, \gamma)$ reaction not only in magnitude but also in sign: $H_{reg}$ = -14,4 T, $H_{def}$ = + 62 T.
Show AbstractPicosecond laser spectroscopy applied to the unrelaxed ground states of luminescence centers with large Stokes losses
Picosecond laser spectroscopy applied to the unrelaxed ground states of luminescence centers with large Stokes losses
V.N. Salomatov, S.N. Mysovskii
A study is made of the scope for examining the unrelaxed ground state of a luminescence center with high Stokes loss on increasing the population of that state by means of amplified light pulses acting on the crystal in synchronism with test ones.
Show AbstractEffects of an electric field on the photoelectric parameters of a-Si:H
Effects of an electric field on the photoelectric parameters of a-Si:H
I.A. Kurova, N.N. Ormont
Measurements have been made on the temperature dependence of the stationary band-band photoconductivity, the lux-ampere characteristic LAC, and the voltage-current characteristic (VCC) for a-Si:H films in electric fields of up to $2\cdot 10^4 V\cdot cm^{-1}$. In weak fields, there is thermal photoconductivity quenching, and the LAC becomes superlinear in the quenching region. It is found that an electric field can suppress the thermal quenching of the stationary band-band photoconductivity and the superlinearity in the LAC.
Show AbstractVon Neumann algebras for arbitrary-spin fields
Von Neumann algebras for arbitrary-spin fields
D.G. Fedorov, S.S. Khoruzhii
A modification of Khoruzhii's method is formulated for a system of Whiteman fields of arbitrary spin, which enables one to use the modular Tomita-Takesaki theory to put the Whiteman fields into correspondence with local von Neumann field algebras without imposing additional conditions on the fields. This provides a network of von Neumann algebras for fields of any spin that satisfies all the axioms in the algebraic approach, including the axiom of locality in the generalized form of locality with torsion.
Show AbstractEffects of collisions of the second kind between electrons and excited atoms on the electron energy distribution in an inert-gas plasma
Effects of collisions of the second kind between electrons and excited atoms on the electron energy distribution in an inert-gas plasma
A.P. Ershov, A.A. Kuzovnikov
A numerical solution to the kinetic equation is used to consider the effects of collisions of the second kind between electrons and excited atoms on the electron energy distribution and the rates of inelastic processes in a stationary neon-xenon plasma. The effects become substantial at values of the reduced electric field E/p of the order of tenths of a $V\cdot cm^{-1} \cdot Torr^{-1}$ and degrees of ionization $p<10^{-6}$ if the over-all concentration of the atoms in the lower excited levels exceeds the electron concentration.
Show AbstractPhotoconductivity and photo-EMF under relaxation conditions. Part 2
Photoconductivity and photo-EMF under relaxation conditions. Part 2
Yu.P. Drozhdov
A simple model is considered that provides a qualitative explanation of the intensity and temperature dependence of the photocurrent observed for various materials.
Show AbstractThe Hamiltonian forms of some integration methods
The Hamiltonian forms of some integration methods
Yu.G. Pavlenko
Three integration methods are considered in Hamiltonian form: the rapidly rotating phase method, generalization of the Newton-Kantorovich method for arbitrary systems, and Fock's fifth-parameter method, which opens up a new approach to integrating Maxwell's equations.
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