The relation between thermal heat capacity of rock forming minerals and mean atomic weight
The relation between thermal heat capacity of rock forming minerals and mean atomic weight
G.I. Petrunin
The article establishes an empirical relation between the thermal capacity of rock-forming minerals and their mean atomic weight M based on existing experimental data. The basic conclusions are as follows. 1. In a given class of minerals, the mean atomic thermal capacity is a constant, while the specific thermal capacity is proportional to the mean atomic weight. 2. The mean atomic thermal capacity decreases with increasing complication of the compound (increase in the number of atoms in the molecule), which, is equivalent to a decrease in $с_{р}$ with M remaining constant. 3. The specific thermal capacity of minerals that form rocks of the crust and upper mantle is a constant at 300°K and equal to 0.18 cal/g °K to within about 5%.
Show AbstractThe device for measurement of fusion heat and heat parameters of substances in the temperature region 800—2000 К
The device for measurement of fusion heat and heat parameters of substances in the temperature region 800—2000 К
E.V. Orlik, G.I. Petrunin
A device and technique which may be used to measure the group of thermal properties of substances as well as the heat of fusion in the temperature range 800-2000°K using samples shaped as massive cylinders with external heating in regular regimes of the second and third kinds is described. Formulas are obtained from a solution of the thermal problem and the inclusion of initial conditions which may be used to compute the thermal capacity, thermal conductivity, thermal diffusivity in the regular regime of the second kind by means of a single temperature transducer. Results from a trial of the device with samples of graphite, copper, and silver are presented.
Show AbstractThe influence of water impurities on association processes of Rodamin 6G molecules in ethanol solution
The influence of water impurities on association processes of Rodamin 6G molecules in ethanol solution
L.V. Levshin, M.G. Reva, B.D. Ryzhikov, S.I. Stalmakhovich
The influence of impurities in water on the development of association processes and the structure of the resulting associates of rhodamine 6G molecules is studied in the article. Depending on the quantitative content of water at low temperatures, it is possible for two types of associates to form, in which the molecules are combined either by means of water molecules or by dispersion interaction. It is shown that temperature shifting of the maxima of the long-wave color absorption bands at low water contents is attributable to the variation in the concentration of the water molecules, which have solvate shells of different compositions.
Show AbstractSpectroscopic study of the structure of Rodamine 6G associates in ethanol solutions
Spectroscopic study of the structure of Rodamine 6G associates in ethanol solutions
L.V. Levshin, M.G. Reva, B.D. Ryshikov
The concentration dependence of the absorption spectra of ethanol solutions of rhodamine 6G at low temperatures is studied. It is established that under these conditions two types of associates may form. Associates with a general solvate shell typically manifest a new band in the absorption spectrum which appears as a consequence of a shift of the electronic levels of monomer molecules created by the field of nearby molecules. Associates consisting of molecules with individual solvate shells have lesser absorptivity than the monomer molecules. Molecules are joined into such associates as a consequence of dispersion interaction.
Show AbstractInhomogeneous oscillations of domain boundaries in single crystal ferrite samples
Inhomogeneous oscillations of domain boundaries in single crystal ferrite samples
S.A. Kirov
Spatially in homogeneous collective oscillations of domain boundaries are examined in a magnetostatic approximation for the case of a singlecrystal magnetic dielectric sample with plastic two - phase domain structure. It is proposed that the spatial period of the oscillations is somewhat greater than the domain width, and that the displacements of all the boundaries are related by means of the demagnetizing field. A dispersion relation is obtained for plane waves of the boundary displacements. The spectrum of inhomogeneous oscillations of boundaries analogous to the Walker modes in the saturation region is computed for the case of a spherical sample.
Show AbstractThe coherent Raman mixing in the case of the simultaneous excitation of forward and backward Raman waves
The coherent Raman mixing in the case of the simultaneous excitation of forward and backward Raman waves
Yu.E. Dyakov, S.Yu. Nikitin
A steady - state Raman scattering theory is developed for conditions of simultaneous scattering of excitation in the forward and backward directions. The influence of the return Stokes component on the effectiveness of coherent Raman shifts is studied.
Show AbstractOptical and electrical properties of amorfous-crystalline lead-tin telluride films
Optical and electrical properties of amorfous-crystalline lead-tin telluride films
A.P. Gоrсhakоv, Yu.A. Zarifуants
The influence of heat treatment in a vacuum and in oxygen on the optical and electrical properties of amorphous crystalline films of Pb$_{0,8}$ Sn$_{0,2}$Te is investigated. The influence of oxide phases on crystallization and the variation in the stoichiometric composition of the films are found.
Show AbstractOn the photo-injection method of investigation of the charge carriers transport mechanism in dielectric layer of the dielectric-semiconductor system
On the photo-injection method of investigation of the charge carriers transport mechanism in dielectric layer of the dielectric-semiconductor system
R.K. Кashkarоv, S.N. Коzlоv, N.V. Mоrоzоv
Temperature dependences of the capture of charge carriers photo- injected from a semiconductor onto electronic oxide traps in the Ge—GeO$_2$ system are studied. It is shown that transport of photo - injected charge carriers along localized tail states is performed by means of a skip mechanism.
Show AbstractResonance peculiarities in sound focusing by liquid sphere
Resonance peculiarities in sound focusing by liquid sphere
N.N. Makarchenko, F.V. Rozhin, O.S.Tonakanov
The angular and radial dependences of the acoustic pressure field for different values of the wave dimension $kr_0$ and attenuation in the material of a sphere are computed as a result of an exact solution using a BESM - 6 computer of a diffraction problem for a plane acoustic wave affected by a liquid sphere. Excitation of the natural vibrations of the sphere at definite values of $kr_0$ lead to a sharp variation of these dependences. At the n - th resonance, the angular dependence of scattering is determined by the dominant Legendre polynomial $P_n$, which leads to an increase in the number and amplitude of the secondary maxima, as well as to a significant increase in the maximum at θ = 0° (direction of mirror reflection). Attenuation in the material of the sphere leads to "stabilization" of the radial and angular pressure distributions, thereby converting the lens into a wide - band focusing system. The selection of material for this sphere with wave resistance ¯pc equal to the wave resistance of the surrounding liquid pc, does not eliminate the resonance nature of the focusing effect with $¯pc^{2}$ /$рс^{2}$ ≠ 1 (i.e., in the case of different compressibilities of the external and internal liquid).
Show AbstractInvestigation of a nonlinear-parametric divider with a fixed time duration of interaction
Investigation of a nonlinear-parametric divider with a fixed time duration of interaction
L.V. Ваlakin, М.D. Каrasеv, V.I. Меdvеdеv
An improved electromechanical frequency divider is experimentally and theoretically reviewed. In this divider, interaction between the electrical oscillations are the divided frequency and the low - frequency mechanical oscillatory system occurs during a short time interval τ≈T/2 (T=2π/ω) is the period of the divided frequency) near the equilibrium position. Truncated equations are obtained by means of the method of slowly varying amplitudes for the amplitudes and phases of this frequency divider, whose steady - state values are analyzed for two cases, one in which the interaction time is greater than half the period of the high - frequency oscillation (ωτ>π) and the second case in which it is less than it (ωτ<π). The amplitude responses of the divider for the divider bands thus obtained are compared to experimental data. Results of a coputation on the BESM - 4M of the steady - state amplitude and phase processes of an electromechanical frequency divider are presented for cases in which the external effect is approximated by one or two gaussian curves.
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