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Sergei Kudriavtcev Tatiana Valtsev Alexei Kazharskyi Elena Goncharov Iurii Berestianyi 《寒旱区科学》2013,5(4):0404-0407
The goal of a predictive thermotechnical calculation is to model the behavior of the top permafrost boundary under current
operational conditions as well as increasing average annual air temperatures that results in degradation of the permafrost
layer. Numerical modeling was used to assess the efficient application of construction measures to create sustainable operation
of the railroad. The numerical modeling was carried out in the programming complex FEM-models developed by
geotechnical engineers of St. Petersburg, Russia under Prof. V. M. Ulitsky’s guidance. The Termoground Program as a part
of the FEM-models enables the research of freezing, heaving and thawing in different design solutions. Research was
carried out in space resolution for a year cycle. The performed model has shown that the designing measures accepted for
permafrost protection from retreat in the subgrade support were generally effective. 相似文献
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We present a new experimental platform for studies of turbulence and turbulent mixing in accelerating and rotating fluids.
The technology is based on the ultra-high performance optical holographic digital data storage. The state-of-the-art electro-mechanical,
electronic, and laser components allow for realization of turbulent flows with high Reynolds number (>107) in a relatively small form-factor, and quantification of their properties with extremely high spatio-temporal resolutions
and high data acquisition rates. The technology can be applied for investigation of a large variety of hydrodynamic problems
including the fundamental properties of non-Kolmogorov turbulence and turbulent mixing in accelerating, rotating and multiphase
flows, magneto-hydrodynamics, and laboratory astrophysics. Unique experimental and metrological capabilities enable the studies
of spatial and temporal properties of the transports of momentum, angular momentum, and energy and the identification of scalings,
invariants, and statistical properties of these complex turbulent flows. 相似文献
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The problem of clock synchronization: A relativistic approach 总被引:2,自引:0,他引:2
Sergei A Klioner 《Celestial Mechanics and Dynamical Astronomy》1992,53(1):81-109
The problem of synchronization of the Earth-based clocks has been discussed in the framework of General Relativity Theory. The synchronization is considered as the transformation of the observers' proper time scales to the coordinate time scale of local inertial geocentric reference system, which is single for all the observers. The formulas for the relativistic corrections occurring in some methods of Earth-based clock synchronization (transported clock, duplex communication via geostationary satellite and meteor-burst link, LASSO experiments) have been derived enabling one to attain the accuracy of 0.1 ns. 相似文献
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Sergei B. Popov 《Astrophysics and Space Science》2000,274(1-2):285-290
I discuss the nature of the compact X-ray source in the center of the supernova remnant RCW 103. Several models, based on
the accretion onto a compact object are briefly discussed. I show that it is more likely that the central X-ray source is
an accreting neutron star than an accreting black hole. I also argue that models of a disrupted binary system consisting of
an old accreting neutron star and a new one observed as a 69-ms pulsar are most favored.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
19.
Sergei V.Antipin Ignacio Becker AlexANDer A.Belinski Darya M.Kolesnikova Karim Pichara Nikolay N.Samus Kirill V.Sokolovsky Alla V.Zharova Alexandra M.Zubareva 《天文和天体物理学研究(英文版)》2018,(8)
Using 172 plates taken with the 40-cm astrograph of the Sternberg Astronomical Institute(Lomonosov Moscow University) in 1976–1994 and digitized with a resolution of 2400 dpi, we discovered and studied 275 new variable stars. We present the list of our new variables with all necessary information concerning their brightness variations. As in our earlier studies, the new discoveries show a rather large number of high-amplitude Delta Scuti variables, predicting that many stars of this type remain not detected in the whole sky. We also performed automated classification of the newly discovered variable stars based on the Random Forest algorithm. The results of the automated classification were compared to traditional classification and showed that automated classification was possible even with noisy photographic data. However, further improvement of automated techniques is needed, which is especially important when considering the very large numbers of new discoveries expected from all-sky surveys. 相似文献
20.
There have been several claims that seismic shear waves respond to changes in stress before earthquakes. The companion paper develops a stress-sensitive model (APE) for the behaviour of low-porosity low-permeability crystalline rocks containing pervasive distributions of fluid-filled intergranular microcracks, and this paper uses APE to model the behaviour before earthquakes. Modelling with APE shows that the microgeometry and statistics of distributions of such fluid-filled microcracks respond almost immediately to changes in stress, and that the behaviour can be monitored by analysing seismic shear-wave splitting. The physical reasons for the coupling between shear-wave splitting and differential stress are discussed.
In this paper, we extend the model by using percolation theory to show that large crack densities are limited at the grain-scale level by the percolation threshold at which interacting crack clusters lead to pronounced increases in rock-matrix permeability. In the simplest formulation, the modelling is dimensionless and almost entirely constrained without free parameters. Nevertheless, APE modelling of the evolution of fluid-saturated rocks under stress reproduces the observed fracture criticality and the narrow range of shear-wave azimuthal anisotropy in crustal rocks. It also reproduces the behaviour of temporal variations in shear-wave splitting observed before and after the 1986, M = 6, North Palm Springs earthquake, Southern California, and several other smaller earthquakes.
The agreement of APE modelling with a wide range of observations confirms that fluid-saturated crystalline rocks are stress-sensitive and respond to changes in stress by critical fluid-rock interactions at the microscale level. This means that the effects of changes in stress and other parameters can be numerically modelled and monitored by appropriate observations of seismic shear waves. 相似文献
In this paper, we extend the model by using percolation theory to show that large crack densities are limited at the grain-scale level by the percolation threshold at which interacting crack clusters lead to pronounced increases in rock-matrix permeability. In the simplest formulation, the modelling is dimensionless and almost entirely constrained without free parameters. Nevertheless, APE modelling of the evolution of fluid-saturated rocks under stress reproduces the observed fracture criticality and the narrow range of shear-wave azimuthal anisotropy in crustal rocks. It also reproduces the behaviour of temporal variations in shear-wave splitting observed before and after the 1986, M = 6, North Palm Springs earthquake, Southern California, and several other smaller earthquakes.
The agreement of APE modelling with a wide range of observations confirms that fluid-saturated crystalline rocks are stress-sensitive and respond to changes in stress by critical fluid-rock interactions at the microscale level. This means that the effects of changes in stress and other parameters can be numerically modelled and monitored by appropriate observations of seismic shear waves. 相似文献