Physical principles for combining images acquired with remote probing
Physical principles for combining images acquired with remote probing
A.G. Ermolaev, S.V. Kireev, Yu.P. Pyt'ev
The instability of the trajectory and orientation of a satellite when taking a photograph results in the fact that any two images of the same sector of the Earth's surface are recorded from different viewpoints and at different angles. Therefore, in order to process video information recorded at different times, the photographs must be correlated. In this work this correlation is performed on the basis of a physical model of image recording and mathematical methods for morphological analysis of images in an example of the Landsat satellite (USA).
Show AbstractThe precision and reliability of interpreting a series of measurements
The precision and reliability of interpreting a series of measurements
Yu.P. Pyt'ev
It is shown that an increase in the number of measurements does not reduce the precision of interpretation, while the reliability may either rise or fall. The necessary and sufficient conditions for convergence of reliability in terms of probability to zero and in terms of the distribution to the reliability of a precise model with aoproach by the measurement number to infinity are acquired.
Show AbstractA numerically asymptotic method for rating a screened magnetic system
A numerically asymptotic method for rating a screened magnetic system
V.B. Glasko, N.I. 0l'khovskaya
An asymptotic method is developed for calculating magnetic field perturbations caused by the presence of a screen with high electromagnetic permittivity. A numerical algorithm is proposed for its solution.
Show AbstractSignal filtration in experiments with test fields with little a priori information
Signal filtration in experiments with test fields with little a priori information
A.V. Gusev, V.N. Rudenko
The minimal root mean square error is calculated when restoring a useful signal $F_s(t)$ in experiments with test fields with minimal prior information $sup_{-\infty
Measuring the parameters of a pulsed microwave discharge in a waveguide using a conductivity method
Measuring the parameters of a pulsed microwave discharge in a waveguide using a conductivity method
P.S. Bulkin, G.S. Solntsev, S.A. Dvinin, I.E. Shkradyuk
Two methods for studying the conductivity of a plasma of a pulsed microwave discharge are compared: in a direct current and at the frequency of the field which creates the charge. The first of them is valid regardless of the length or form of the channel of the microwave discharge in a waveguide and is not limited by the size of the skin effect. According to the estimate, the concentration of electrons in the channel of the microwave discharge in the conditions of the experiment at atmospheric pressure is $10^{16}-10^{17}$ cm$^{-3}$.
Show AbstractA general method for synthesis of dual-component, multilayer optical coatings
A general method for synthesis of dual-component, multilayer optical coatings
A.G. Sveshnikov, Sh.A. Furman, A.V. Tikhonravov, S.A. Yanshin
A method is described for synthesis of dual-component, multilayer optical coatings which operate with slanted light incidence. The method includes two stages: direct exhaustive search and minimization of the selected initial approximations. An effective method for calculating the gradient of the appraising functional is cited.
Show AbstractSynthesis of two-component optical coatings based on required optimality
Synthesis of two-component optical coatings based on required optimality
N.V. Grishina
A method is examined for synthesizing optical coatings with assigned spectral characteristics. The method is based on the necessary conditions of system optimality and is especially effect when there is no known good initial approximation. Numerical examples of synthesis of broad band anti-reflecting coatings and light dividers are presented.
Show AbstractCalculating the statistical characteristics of diffracting high intensity acoustfcal noise
Calculating the statistical characteristics of diffracting high intensity acoustfcal noise
O.V. Rudenko, V.A. Khokhlova
A method is proposed for calculating the statistical characteristics of nonlinear diffracting noise. The spatial noncohenence of the fields in problems of nonlinear acoustics is considered for the first time. An example of noise diffraction with a broad spectrum is examined. It illustrates the mutual effect of time and space statistics even in a linear approximation.
Show AbstractElectrical conductivity of liquid metals
Electrical conductivity of liquid metals
L.P. Filippov
The dimensionless value $\lambda = 150 (М/\rho)^{1/3}/r$, (M is the molar mass, $\rho$ is density, and r is the specific resistance in $\mu\Omega\cdot$cm), interpreted as the ratio of the mean length of the free range of electrons to the distance between the ions, is examined. A simple formula is found which describes the dependence of $\lambda$ on temperature and pressure through the dependence on density $(\rho) :\lambda = const\cdot \rho^2/(\rho_0-\rho)$, where $\rho_0$ is a parameter. It is shown that the discovered formula is suitable for describing the electrical conductivity of liquid and solid metals in a broad range of states.
Show AbstractOptimal two-pulse flights on an asymptotic trajectory
Optimal two-pulse flights on an asymptotic trajectory
S.I. Sumarokov
Optimal two-pulse flights from a circular near-earth orbit onto an asymptotic trajectory which leads to a libration point $L_2$ are examined within a limited circular problem of three bodies. A method of many conical cross sections and Louden's base vector theory were used in building the pulsed trajectories. The minimal energy expenditures correspond to a 77-hour flight. The total expenditures are 3468.3 m/sec for this flight.
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