Interaction between serum albumin and water at different concentrations of hydrogen ions based on data from Rayleigh scattering
Interaction between serum albumin and water at different concentrations of hydrogen ions based on data from Rayleigh scattering
G.P. Petrova, Yu.M. Petrusevich, I.I. Shirkova, O.P. Revokatov
Diluted solutions of serum albumin in water are studied at different values of the total surface charge in protein using a Rayleigh light scattering method. It is shown that the effective electron polarizability, the second virial coefficient, the degree of depolarization, and the parameters of the tensor of polarizability of the macromolecules of the protein are a nonlinear function of the pH of the solution and have an extremum at the isoelectric point.
Show AbstractThe role of structural defects and admixtures in reconstructing a (100) silicon surface
The role of structural defects and admixtures in reconstructing a (100) silicon surface
V.V. Burmistrov, E.M. Dubinina, S.S. Elovikov, V.P. Ivannikov
The (100) facet of silicon is investigated using methods of diffraction of slow electrons and electron Auger spectroscopy. (2 by 1), p(2 by 2), and c(4 by 4) superstructures are noted as the surface admixtures are removed from the sample. The c(4 by 4) superstructure is shifted into a(4 by 1) superstructure with subsequent electron effects ($T=450^{\circ} С$, E = 3 keV, and $D = 5\cdot 10^{19}$ electrons/cm$^2$). A model of the mutual transition of the cited elementary cells with each other is constructed using a quantum-chemical approximation of valent bonds.
Show AbstractA theory of formation of energy spectra of coherent Compton scattering
A theory of formation of energy spectra of coherent Compton scattering
V.A. Bushuev, A.O. Ait
Coherent phenomena during Compton scattering (CS) of X-rays in ideal crystals are theoretically investigated. The problem about dynamic, two-wave Laue diffraction of Compton radiation in absorbing crystals of random thickness is solved in the general form. It is shown that the coherent Compton effect is a sensitive method for studying the nondiagonal elements of the electron density matrix in a pulsed space, especially with asymmetrical diffraction.
Show AbstractA second order current and nonconservation of C-parity
A second order current and nonconservation of C-parity
M.N. Dubinin
The widths of $\tau \to \pi \eta \nu$ and $\eta \to \pi e^+e^-$ decays, in which a second order $\pi \eta$-current participates, are calculated. It is proposed that the charged and neutral $\pi \eta$-currents are components of a single isovector. The upward experimental limitation on the width of the electromagnetic decay $\Gamma (\eta \to \pi e^+e^-)/\Gamma_{tot}<4,5\cdot 10^{-5}$ which disrupts the C-parity makes it possible to acquire an estimate of $\Gamma (\tau \to \pi \eta \nu)/\Gamma_{tot}<5,3\cdot10^{-5}$ for the decay of a $\tau$-lepton.
Show AbstractComplex nuclei in primary cosmic rays as superhigh energy $\gamma$-quanta sources
Complex nuclei in primary cosmic rays as superhigh energy $\gamma$-quanta sources
V.V. Balashov, V.L. Korotkikh, I.V. Moskalenko
The role of complex nuclei in the formation of rigid cosmic $\gamma$-radiation is investigated. The calculated energy spectra of the $\gamma$-rays in a range of $10^8\div 10^{16}$ eV provides the basic characteristics of the experimental data which relate to the discrete Cygnus X-3 source.
Show AbstractSuperradiation in a resonator
Superradiation in a resonator
A.V. Andreev
A model is proposed of superradiation in a resonator in a mode of pulse self-extraction which is achieved by using slipping reflection from one of the facets of the resonator. The possibility of a substantial increase in intensity and a reduction in the pulse duration in such an arrangement is shown.
Show AbstractNonlinear gyrotropy in silver thiogallate
Nonlinear gyrotropy in silver thiogallate
V.A. Grabovskii, N.I. Zheludev
Nonlinear absorption ($K_2 \sim З\cdot 10^{-3}$ Mw$^{-1}\cdot$cm) and nonlinear optical activity ($С\sim 3\cdot 10^{-3}$ deg$\cdot$Mw$^{-1}\cdot$cm) are measured in $AgGaS_2$ at a wavelength of 0.532 μm.
Show AbstractInvestigation of the lifetime of the upper laser level of Ar II $4р^2D_{5/2}$ based on the spontaneous emission in a coupled transition
Investigation of the lifetime of the upper laser level of Ar II $4р^2D_{5/2}$ based on the spontaneous emission in a coupled transition
L.E. Grin, O.S. Zaroslova, S.S. Kartaleva, V.V. Lebedeva, A.I. Odintsov
The change in the lifetime of the upper laser level $4р^2D_{5/2}$ in the plasma of an argon laser is investigated using the spontaneous emission in a transition coupled with the laser transition. With a rise in the concentration of electrons from $10^{13}$ to $10^{14}$ cm$^{-3}$ the lifetime of the level is reduced from 10 to 4 nsec, which may be totally associated with the rise in the number of electron collisions.
Show AbstractProcesses of dynamic reorientation of a nematic liquid crystal
Processes of dynamic reorientation of a nematic liquid crystal
Yu.V. Vasil'ev, E.F. Kuritsyna
An experimental investigation is performed of the transition processes in a plane-parallel optical cell based on a nematic liquid crystal with a staged change in the magnitude of the magnetic field which creates deformations such as pure twisting of the director.
Show AbstractSpeeding up calculation when solving inverse scattering problems using iterational methods
Speeding up calculation when solving inverse scattering problems using iterational methods
A.V. Saskovets
Certain simplified variants of a previously proposed iterational algorithm for solving inverse scattering problems with consideration of rescatterings of a wave which probes a heterogeneity are examined. The errors in restoration of the function which describes this particular heterogeneity are estimated. They form due to the introduced simplification. A solution method is proposed which makes it possible to greatly accelerate restoration of the disperser. The effectiveness of the method is illustrated by some results from a model experiment.
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