Parametric Structural Approach to Constructing Digital Models of the Relief and Gravitational Field of the Earth Using Analytical S-Approximations     

Stepanova  I. E.  Shchepetilov  A. V.  Pogorelov  V. V.  Mikhailov  P. S. 《Izvestiya Atmospheric and Oceanic Physics》2020,56(8):859-868

Izvestiya, Atmospheric and Oceanic Physics - This paper discusses the peculiarities of applying the parametric structural approach to constructing analytical approximations of the relief of the...  相似文献   

Determination of the Magnitude of the Spins of Supermassive Black Holes and the Magnetic Fields in Active Galactic Nuclei     

A. G. Mikhailov  Y. N. Gnedin  A. V. Belonovsky 《Astrophysics》2015,58(2):157-167

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Orbital monitoring of the ionosphere and abnormal phenomena by the small Vulkan-Compass-2 satellite     

V. D. Kuznetsov  L. Bodnar  G. K. Garipov  V. A. Danilkin  V. G. Degtyar  V. S. Dokukin  T. A. Ivanova  O. V. Kapustina  V. E. Korepanov  Yu. M. Mikhailov  N. N. Pavlov  M. I. Panasuyk  I. S. Prutenskii  I. A. Rubinshtein  Yu. Ya. Ruzhin  V. M. Sinelnikov  V. I. Tulupov  Ch. Ferents  A. V. Shirokov  I. V. Yashin 《Geomagnetism and Aeronomy》2011,51(3):329-341

Natural disasters, the processes of their origin and large-scale technogenic catastrophes are accompanied by anomalous physical phenomena in near-Earth space (NES). In order to reveal such phenomena, record and investigate them, complex NES monitoring is required with the use of specially designed research equipment onboard a low-orbiting spacecraft. This work presents the results of flight tests of the small Vulkan-Compass-2 satellite with research equipment specially designed for orbital monitoring of the ionosphere and search for abnormal phenomena caused by large-scale catastrophes of different nature.  相似文献   

On the Connection between the 2008–2009 Activation of the Koryakskii Volcano and Deep Magmatic Processes     

Mikhailov  V. O.  Volkova  M. S.  Timoshkina  E. P.  Shapiro  N. M.  Smirnov  V. B. 《Izvestiya Physics of the Solid Earth》2021,57(6):819-824

Izvestiya, Physics of the Solid Earth - Abstract—The last activation of the Koryakskii volcano in 2008–2009 was accompanied by intense fumarolic and seismic activity. Volcanic activity...  相似文献   

The arrow of time at the early stages of biosphere evolution. Determinism and pluralism     

L. A. Gribov  V. I. Baranov  I. V. Mikhailov 《Geochemistry International》2012,50(5):393-408

The modern theory of molecular processes provides a natural explanation for some clue observed features of biosphere formation during the early stages of the appearance of the molecular world. It was shown that a mere increase in the complexity of molecular objects is accompanied by the first manifestations of the fundamental properties that become subsequently predominant in much more complex objects: viruses, cells, bacteria, etc.  相似文献   

The radio source Z0254+43: z = 4.067     

V. R. Amirkhanyan  V. P. Mikhailov 《Astrophysics》2006,49(2):184-193

In January 2005 spectral observations of the radio source Z0254+43 were made on the BTA at the Special Astrophysical Observatory (SAO) of the Russian Academy of Sciences (RAN) and its red shift was found to be z=4.057. The BVRI magnitudes were found to be 22.68, 21.19, 19.94, and 19.23, respectively. Photometric observations in December 2005 on the Zeiss-1000 at the SAO revealed no significant variation in the optical emission from this object over that year. We can discuss its variability on an hourly time scale with some caution. The variability of the flux from Z0254+43 was observed from 1990–2005 on the RATAN-600 over a wide range of frequencies. It turns out that the amplitude of the variability is minimal at a frequency of ∼8 GHz. A model for the variability has been constructed which yields an estimate of ∼28° for the orientation of the jet of Z0254+43 to the line of sight. The luminosity of Z0254+43 in the optical range is ∼2·10²⁶ W/Hz and in the radio frequency range, ∼2·1027 W/Hz. __________ Translated from Astrofizika, Vol. 49, No. 2, pp. 209–220 (May 2006).  相似文献   

Impact of the scale factor on mobilization of residual oil: A laboratory experiment     

N. N. Mikhailov  O. M. Ermilov  I. P. Gurbatova  S. V. Melekhin 《Doklady Earth Sciences》2016,470(1):895-899

Experimental data on residual oil mobilization in laboratory simulation of oil displacement by water demonstrate the impact of the scale effect on this process reflected in the value of residual oil mobilization and displacement thresholds. It is established that residual oil saturation decreases with an increase in the model size used. It is shown that the sizes of clusters of the trapped oil phase correlate with the size of the laboratory model.  相似文献   

Processes of the development of the molecular world at early stages of its formation: Evidence from the investigation of the behavior of the vibrational entropy of molecules     

V. I. Baranov  L. A. Gribov  I. V. Mikhailov 《Geochemistry International》2016,54(11):929-935

We analyzed the possibility of explaining empirical relations in the evolution of the molecular world on the basis of fundamental physical laws and theories of the behavior of the entropy of a system. Quantitative expressions were evaluated describing the entropy of internal motion of atoms in a molecular ensemble (vibrational entropy), which is a term of total entropy with a clear physical meaning. It was shown that vibrational entropy is controlled primarily by the structure of the compound rather than the number and identity of atoms in the molecule. During the early stages of evolution, the appearance of acyclic structures is more advantageous than that of cyclic structures. An increase in the complexity of the molecular world inevitably leads to the appearance of molecules with a complex skeleton formed mainly by bonds of the same elasticity as C–C. The necessity of helical structures, whose spatial elasticity is provided by hydrogen bonds, was explained.  相似文献   

Assessment of prediction performances of stochastic models: Monthly groundwater level prediction in Southern Italy          下载免费PDF全文

Boulariah O  Mikhailov PA  Longobardi A  Elizariev AN  Aksenov SG 《地下水科学与工程》2021,9(2):161-170

Stochastic modelling of hydrological time series with insufficient length and data gaps is a serious challenge since these problems significantly affect the reliability of statistical models predicting and forecasting skills. In this paper, we proposed a method for searching the seasonal autoregressive integrated moving average(SARIMA) model parameters to predict the behavior of groundwater time series affected by the issues mentioned. Based on the analysis of statistical indices, 8 stations among 44 available within the Campania region(Italy) have been selected as the highest quality measurements. Different SARIMA models, with different autoregressive, moving average and differentiation orders had been used.By reviewing the criteria used to determine the consistency and goodness-of-fit of the model, it is revealed that the model with specific combination of parameters, SARIMA(0,1,3)(0,1,2) _(12), has a high R~2 value,larger than 92%, for each of the 8 selected stations. The same model has also good performances for what concern the forecasting skills, with an average NSE of about 96%. Therefore, this study has the potential to provide a new horizon for the simulation and reconstruction of groundwater time series within the investigated area.  相似文献   

Spatial and time variations in critical frequencies of the ionospheric <Emphasis Type="Italic">F</Emphasis> region above the zone of equatorial earthquake preparation     

A. Kh. Depueva  A. V. Mikhailov  M. Devi  A. K. Barbara 《Geomagnetism and Aeronomy》2007,47(1):129-133

Spatial and time variations in the critical frequencies foF2 before the strong earthquake of August 15, 1963, with the magnitude M = 7.75 are analyzed. The epicenter of the earthquake was located in the vicinity of the magnetic equator in the American longitudinal sector. The data of the topside ionosonde on board Alouette-1 and of the series of ground-based ionosondes has been used for this purpose. The ground-based ionosondes made it possible to detect an insignificant anomalous decrease in foF2 within the zone of earthquake preparation a few days prior to the earthquake. This result confirms the conclusion drawn earlier on the basis of the satellite data. The modification of the ionosphere at the F-region level is more evident in the satellite than in the ground-based data. It is also noted that the character of the time variations in foF2 a day before the earthquake is similar to the so called “quiet time” Q-disturbances in the ionosphere, when the electron concentration at the F region maximum differs from the median values by more than 20% under undisturbed geophysical conditions.  相似文献