On the general theory of equivalent projection     

Hojovec  Vladislav  Budinský  B.  Krcho  J. 《Studia Geophysica et Geodaetica》1984,28(4):350-359

Summary The paper deals with the general theory of equivalent projection. By specifying the results derived, special cases may be treated. Examples of methods are described which enable free functions to be found in a general solution. A detailed procedure of solving the problem with a numerical example is given, taking into account the optimization according to the global criterton, established for extreme angular distortion.

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Dedicated to Professor Frantiek Fiala on the Centenary of his Birthday  相似文献   

The Tidal Effect on Climatic Characteristics of the Kara Sea in the Ice-Free Period     

Kagan  B. A.  Sofina  E. V.  Timofeev  A. A. 《Izvestiya Atmospheric and Oceanic Physics》2019,55(2):188-195

Izvestiya, Atmospheric and Oceanic Physics - Using a high-resolution version of the QUODDY-4 three-dimensional finite-element hydrostatic model, we have carried out two series of numerical...  相似文献   

Gravity and Displacement Variations in the Areas of Strong Earthquakes in the East of Russia     

V. Yu. Timofeev  E. N. Kalish  Yu. F. Stus’  D. G. Ardyukov  M. G. Valitov  A. V. Timofeev  D. A. Nosov  I. S. Sizikov  E. V. Boiko  P. Yu. Gornov  R. G. Kulinich  T. N. Kolpashchikova  Z. N. Proshkina  E. O. Nazarov  V. G. Kolmogorov 《Izvestiya Physics of the Solid Earth》2018,54(3):430-443

The modern gravimetry methods are capable of measuring gravity with an accuracy of up to 10^–10 of the normal value, which is commensurate with the accuracy of the up-to-date methods of displacement measurements by satellite geodesy. Significant changes, e.g., in the coseismic displacements of the Earth’s surface are recorded in the zones of large earthquakes. These changes should manifest themselves in the variations of gravity. Absolute measurements have been conducted by various modifications of absolute ballistic gravimeters GABL since the mid-1970s at the Klyuchi point (Novosibirsk) in the south of the West Siberian plate. Monitoring observations have been taking place in the seismically active regions since the 1990s. In this paper we consider the results of the long-term measurements of the variations in gravity and recent crustal displacements for different types of earthquakes (the zones of shear, extension, and compression). In the seismically active areas in the east of Russia, the longest annual series of absolute measurements starting from 1992 was recorded in the southeastern segment of Baikal region. In this area, the Kultuk earthquake with magnitude 6.5 occurred on August 27, 2008, at a distance of 25 km from the observation point of the Talaya seismic station. The measurements in Gornyi (Mountainous) Altai have been conducted since 2000. A strikeslip earthquake with magnitude 7.5 took place in the southern segment of the region on September 27, 2003. The effects of the catastrophic M = 9.0 Tohoku, Japan, earthquake of March 11, 2011 were identified in Primor’e in the far zone of the event. The empirical data are consistent with the results of modeling based on the seismological data. The coseismic variations in gravity are caused by the combined effect of the changes in the elevation of the observation point and crustal deformation.  相似文献   

Physics and Gasdynamics of the Heliospheric Interface     

Vladislav V. Izmodenov 《Astrophysics and Space Science》2000,274(1-2):55-69

During 30 years, a big theoretical effort to understand the physical processes in the heliospheric interface has followed the pioneer papers by Parker (1961) and Baranov et al. (1971). The heliospheric interface is a shell formed by the solar wind interaction with the ionized component of the circumsolar local interstellar medium (LISM). For fully ionized supersonic interstellar plasma two-shocks (the termination shock and the bow shock) and a contact discontinuity (the heliopause) are formed in the solar wind/LISM interaction. However, LISM consists of at least of three components additional to plasma: H-atoms, galactic cosmic rays and magnetic field. The interstellar atoms that penetrate into the solar wind, are ionized there and form pickup ions. A part of the pickup ions is accelerated to high energies of anomalous cosmic rays (ACRs). ACRs may modify the plasma flow upstream the termination shock and in the heliosheath. In this short review I summarize current understanding of the physical and gasdynamical processes in the heliospheric interface, outline unresolved problems and future perspectives. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

The characteristic photoluminescence and EPR features of superdeep diamonds (São-Luis,Brazil)     

Olga P. Yuryeva  Mariana I. Rakhmanova  Vladimir A. Nadolinny  Dmitry A. Zedgenizov  Vladislav S. Shatsky  Hiroyuki Kagi  Andrey Yu. Komarovskikh 《Physics and Chemistry of Minerals》2015,42(9):707-722

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Calcinaksite,KNaCa(Si4O10) H2O,a new mineral from the Eifel volcanic area,Germany     

Nikita V. Chukanov  Sergey M. Aksenov  Ramiza K. Rastsvetaeva  Günter Blass  Dmitry A. Varlamov  Igor V. Pekov  Dmitry I. Belakovskiy  Vladislav V. Gurzhiy 《Mineralogy and Petrology》2015,109(4):397-404

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Seismic model and geological interpretation of the basement beneath the Doupovské Hory Volcanic Complex (NW Czech Republic)     

Jan Valenta  Milan Brož  Jiří Málek  Bedřich Mlčoch  Vladislav Rapprich  Zuzana Skácelová  the Doupov Working Group 《Acta Geophysica》2011,59(3):597-617

The Doupovské Hory Volcanic Complex (DHVC) is the best-preserved large volcanic suite of the Cenozoic intraplate volcanism in the Bohemian Massif. However, many uncertainties remain in the geological setting of its basement. In summer 2008, two seismic refraction profiles ran across this area to reveal the depth of the volcanic rocks and the underlying geological structure.  相似文献   

Seasonal variations in the total content of hydrogen fluoride in the atmosphere     

A. V. Polyakov  Yu. M. Timofeev  A. V. Poberovskii  I. S. Yagovkina 《Izvestiya Atmospheric and Oceanic Physics》2011,47(6):760-765

The results of ground-based measurements of the total content (TC) of hydrogen fluoride in the atmosphere in Peterhof near St. Petersburg for one year (from April 2009 through April 2010) using a Bruker IFS125 Fourier spectrometer with a high spectral resolution (0.005 cm^?1) are presented. The well-known computer code SFIT2 (Zephyr-2) was used for the radiation data inversion. Random measurement errors were 1–5% and the systematic error was 5–10%. The seasonal trend of the HF TC in Peterhof is characterized by a minimum in summer and a maximum in winter through early spring and is very close to the seasonal HF TC trend obtained at the Harestua Network for the Detection of Atmospheric Composition Change (NDACC) station located at about the same latitude. A comparison of the St. Petersburg State University (SPbSU) ground-based measurements with the data of satellite HF TC measurements (with an ACE-FTS instrument) showed a good quantitative agreement of the results for the entire period of observations. According to our ground-based measurements and the satellite measurements with the ACE-FTS instrument, the mean values of the HF TC and its rms variations during the period under investigation are 1.77 × 10¹⁵ and 1.80 × 10¹⁵ cm^?2 (difference 1.5%) and 21 and 18%, respectively.  相似文献   

Velocity anisotropy in granodiorite and quartzite due to the distribution of microcracks   总被引：2，自引：0，他引：2  

Vladislav Babu&#;ka  Zden&#;k Pros 《Geophysical Journal International》1984,76(1):121-127

Summary. The spatial anisotropy of P -wave velocities was investigated in spherical samples of granodiorite and quartzite and correlated with the orientation of microcracks and grain boundaries, determined optically by universal stage techniques. The preferred orientation of normals to cleavage cracks of biotite and amphibole in granodiorite correlates well with the direction of maximum velocity increase under hydrostatic pressure, although the minerals form only nine per cent of the volume. Irregular microcracks in an almost monomineral quartzite have only a very small effect on the velocity anisotropy, although they are also preferentially oriented. The nature of the microdiscontinuities is of primary importance for the velocity anisotropy observed at atmospheric and low hydrostatic pressures.  相似文献   

Diffusive propagation of fast particles in the presence of a moving shock wave     

I. S. Petukhov  S. I. Petukhov  S. A. Starodubtsev  V. E. Timofeev 《Astronomy Letters》2003,29(10):658-666

Based on an analytical model, we determined the temporal dynamics of the spectral shape and spatial distribution of the particles that were impulsively (in time) injected with a specified spectrum in the vicinity of a moving plane shock front. We obtained a condition to determine the influence of the shock front on the particle propagation, where the spatial diffusion coefficient of the particles plays a major role. Diffusive shock acceleration is shown to strongly affect low-energy particles (the intensity maximum coincides spatially with the shock front; hard and soft spectral regions are formed in the spectrum) and weakly affect high-energy particles (the time at which the intensity reaches its maximum is well ahead of the shock arrival time; the spectral shape does not change). In events accompanied by a significant increase in the turbulence level, the influence of the shock front on high-energy particles can change from weak to strong. This change shows up in the spatial distribution and spectral shape of the particles. The dynamics of the particle intensity, calculated with the diffusion coefficients that were determined in accordance with the quasi-linear theory for measured turbulence levels, qualitatively corresponds to the observed solar energetic-particle intensity.  相似文献