The mechanism of temperature and pressure changes in the Earth's atmosphere during solar flares

The effect of solar flares on the weather on Earth is examined. It is concluded that the processes which arise in the atmosphere are so intricate that a single calculation of solar activity is insufficient for long-range forecasting. However, combined consideration of processes dependent upon the dynamic instability of the atmosphere and the effect of solar activity will contribute to the improvement of long-range forecasts

Polarization Properties of the "Photon Pistol"

The deterministic single-photon emission by means of STIRAP through the atoms with degenerate levels is studied. The expression for the polarization matrix of the emitted photon is obtained and its dependence on the polarization of the driving laser field and on the initial atomic state is examined.Comment: 13 pages, 3 figure

Single-atom quantum memory with degenerate atomic levels

The storage and retrieval of a single-photon polarization q-bit by means of STIRAP through the atoms with degenerate levels is studied theoretically for arbitrary polarization of the driving laser field and arbitrary values of the angular momenta of resonant atomic levels. The dependence of the probability of long-term photon storage on the polarization of the driving field and on the initial atomic state is examined.Comment: 12 pages, 1 figure. arXiv admin note: text overlap with arXiv:1203.439

Single-photon emission via Raman scattering from the levels with partially resolved hyperfine structure

The probability of emission of a single photon via Raman scattering of laser pulse on the three-level $\Lambda$ - type atom in microcavity is studied. The duration of the pulse is considered to be short enough, so that the hyperfine structure of the upper level remains totally unresolved, while that of the lower level is totally resolved. The coherent laser pulse is assumed to be in resonance with the transition between one hyperfine structure component of the lower atomic level and all hyperfine structure components of the upper level, while the quantized cavity field is assumed to be in resonance with the transition between the other hyperfine structure component of the lower level and all components of the upper one. The dependence of the photon emission probability on the mutual orientation of polarization vectors of the cavity mode and of the coherent laser pulse is analyzed. Particularly, the case is investigated, when the total electronic angular momentum of the lower atomic level equals 1/2, which is true for the ground states of alkali atoms employed in the experiments on deterministic single photon emission. It is shown, that in this case the probability of photon emission equals zero for collinear polarizations of the photon and of the laser pulse, and the probability obtains its maximum value, when the angle between their polarizations equals 60 degrees.Comment: 5 pages, 3 figure

Theoretical foundations of the methods and means of increasing the efficiency of vibration diagnostics of power equipment

The work is devoted to the development and application of computational and experimental methods and means of increasing the efficiency of vibration diagnostics of power equipment, including gas compressor units of gas transmission systems. There are solutions of the problem of natural frequencies and modes of its vibrations to calculate of the levels of power ratio (sensitivity functions) of equipment units and they are summarized in the form of computational models

Determination of stress‐strain relation using instrumented ball indentation at micron scale

Indentation with the spherical shape indenter has been used for long time as the way to measure true stress – plastic strain curve and corresponding properties: strain-hardening exponent, strength coefficient, yield strength and other values. A different approach has been used to obtain the desired σ(ε) curve from partial loading-unloading (PUL) force vs depth dependence processing using the analytical solutions, finite element modeling (FEM) and neural networks. The last two methods have primarily laboratory applications, while analytical approach has been used to determine mechanical properties in industrial applications. Automated ball indentation (ABI) [1, 2] is one of those most old established methods, which was mostly used for the pipeline and weld joints control. In current work, we present the results of the application of ABI method for the determination of stress – strain relation in micrometer range. Please click Additional Files below to see the full abstract

Determination of stress‐strain relation using instrumented ball indentation at micron scale

Indentation with the spherical shape indenter has been used for long time as the way to measure true stress – plastic strain curve and corresponding properties: strain-hardening exponent, strength coefficient, yield strength and other values. A different approach has been used to obtain the desired σ(ε) curve from partial loading-unloading (PUL) force vs depth dependence processing using the analytical solutions, finite element modeling (FEM) and neural networks. The last two methods have primarily laboratory applications, while analytical approach has been used to determine mechanical properties in industrial applications. Automated ball indentation (ABI) [1, 2] is one of those most old established methods, which was mostly used for the pipeline and weld joints control. In current work, we present the results of the application of ABI method for the determination of stress – strain relation in micrometer range. Please click Additional Files below to see the full abstract