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Microhomogeneity of amorphous structure in the alloy $Cu_{35}Zr_{65}$

Microhomogeneity of amorphous structure in the alloy $Cu_{35}Zr_{65}$

G.S. Zhdanov, N.A. Khatanova, A.R. Altynbaeva

Moscow University Physics Bulletin 1987. 42. N 4. P. 130

It is established by means of X-ray diffraction analysis and diffractional electron microscopy, that the amorphous alloy $Cu_{35}Zr_{65}$ undergoes natural aging. After holding at room temperature for three years, partial crystallization of $CuZr_2$ phase occurs. It is shown that both topological and compositional short-range microheterogeneity is observed in the amorphous phase remaining after partial crystallization.

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The equivalence of passive-input-output devices

The equivalence of passive-input-output devices

V.I. Shestakov

Moscow University Physics Bulletin 1987. N 3.

The relation of equivalence of passive input-output devices is identified in terms and symbols of the statements of calculation of three-digit Bochvar logic and the basic properties of this relation are deduced.

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A gage-invariant Lagrangian for a Poincare group

A gage-invariant Lagrangian for a Poincare group

A.P. Demichev, N.F. Nelipa

Moscow University Physics Bulletin 1987. 42. N 3. P. 1

A previously proposed method is used to analyze the possibility of building a gage-invariant action for a Poincare group which satisfies the physical requirements. It is shown that such an action cannot be built in the case of precise symmetry, but can be built with spontaneous disruption of symmetry. In this case the possibility arises of the existence of massive vector particles which correspond to the gage fields of the translation subgroup.

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A method for calculating vertex type Feynman integrals

A method for calculating vertex type Feynman integrals

E.E. Boos, A.I. Davydychev

Moscow University Physics Bulletin 1987. 42. N 3. P. 6

A method is proposed for precise calculation of the dimensionally regularized apex type Feynman diagrams. This metod is used to find expressions for a class of massless vertex integrals which expand the number of precisely calculable Feynman diagram in the quantum field theory and which are of interest for calculations in gage theories and in studying processes involving participation of elementary particles at high energies.

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Observable post-Newtonian effects caused by static, even-power metric Finsler functions

Observable post-Newtonian effects caused by static, even-power metric Finsler functions

A.K. Aryngazin, G.S. Asanov

Moscow University Physics Bulletin 1987. 42. N 3. P. 11

Orbital gravitational effects and the signal delay effect, caused by static, even-power Finsler metrics, are studied. These metrics generalize the ordinary static Riemann (quadratic, M = 2) metrics for the case of static biquadratic, etc. (M = 4, 6, ... ) metrics. The upper limits for specific Finsler parameters are found using observation data about the shift of the perihelion and signal delay.

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Collision of relativistic heavy ions

Collision of relativistic heavy ions

D.A. Slavnov

Moscow University Physics Bulletin 1987. 42. N 3. P. 17

The results of the assumption that at high energies nucleus-nucleus scattering passes through a stage of valon plasma are examined. The multiplicities of secondary hadrons are calculated in the fragmentational field of an incident beam as functions of the minimal value of the scaling variable.

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Reduction of images distorted by a turbulent atmosphere

Reduction of images distorted by a turbulent atmosphere

Yu.P. Pyt'ev, A.I. Chulichkov, N.M. Chulichkova

Moscow University Physics Bulletin 1987. 42. N 3. P. 22

Reduction methods are examined in application to processing images acquired with observation through a layer of turbulent atmosphere. The purpose of the processing is to represent the images in a form in which they can be recorded using a near-ideal instrument without the atmosphere. The influence of the statistical characteristics of the medium on the result of the processing is investigated and requirements for additional information about the subject of observation for achieving an assigned reduction quality are formulated.

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The problem of mathematical processing of experimental results from semiconductor nuclear radiation detectors

The problem of mathematical processing of experimental results from semiconductor nuclear radiation detectors

I.V. Mitin, T.D. Shodmonkulov

Moscow University Physics Bulletin 1987. 42. N 3. P. 28

The use of a reduction method for processing experimental results from semiconductor detectors in the presence of a priori information about the nature of the measuned signal is examined. The possibility of a dialog mode when processing the experimental results is indicated, when the researcher has the capability of acquiring more precise and reliable results with parametric assignment of the a priori information.

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Using three-value logic in the theory of dimensionality of physical values

Using three-value logic in the theory of dimensionality of physical values

V.I. Shestakov

Moscow University Physics Bulletin 1987. 42. N 3. P. 41

The use of calculation of statements of three-value Bochvar logic in the theory of dimensionality of physical values is examined. A "draft" of the theory of dimensionalities, whose basic postulate is the formula which symbolically expresses the statement: "If the equality V = W makes sense, then the equality [VJ] = [WJ] of the [VJ] and [WJ] dimensionalities of the physical values V and W is true," is presented. The question about the dimensionalities of physical values in the Gauss and ISU (International System of Units) is briefly examined.

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The effect of equipment noises on the sensitivity of a rapid frequency SQUID [superconducting quantum interference device] in the "out of plateau" mode

The effect of equipment noises on the sensitivity of a rapid frequency SQUID [superconducting quantum interference device] in the "out of plateau" mode

A.V. Gusev

Moscow University Physics Bulletin 1987. 42. N 3. P. 48

The actual sensitivity of a radio frequency SQUID, determined by fluctuations in the electrical degree of freedom and the preamplifier with selection of the working point between neighboring plateaus, is theoretically investigated. A standard method for describing regenerative systems, which operate in a conditionally stable mode, is used to describe the signal and noise characteristics of SQUID in this mode. Formulas are found for calculating the actual sensitivity of a SQUID with amplitude-phase demodulation of the output signal, and a comparison with the traditional "on plateau" mode is performed.

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