On heterogeneous structure of atmospheric current in various meteorological conditions according to the Kola Peninsula observation data     

O. I. Akhmetov  M. I. Beloglazov  Yu. V. Fedorenko 《Russian Meteorology and Hydrology》2010,35(5):327-332

According to results of observations at Apatity station in the end of summer-beginning of autumn of the year 2006, investigations of aeroelectric characteristics of the surface layer of atmosphere for various meteorological conditions are carried out to find out the spatial structure of atmospheric currents. Horizontal scales of aeroelectric heterogeneities at the wind speed of 2–6 m/s are evaluated using statistical methods. It is shown that the distribution function of raindrop charges is constant for one rain cloud during time interval of about 20 min, but can considerably vary from one cloud to another.  相似文献   

寒区活动层中合成材料的寒冻破坏分析     

Valeri Grebenets 《冰川冻土》2004,26(Z1):296-300

In last years, the problem of building s stability in northern areas has become aggravating. The main reasons mass deformations areas follows: 1) mistakes during research, planning, construction and operation of objects; 2) negative changes in frozen ground, bound with reduction of footing s bearing capacity under technogenic impact; 3) premature wear of material of underground constructions under influence of natural and technogenic factors.  相似文献   

Interactive maps for visual exploration of grid and vector geodata     

Gennady Andrienko  Natalia Andrienko  Valeri Gitis 《ISPRS Journal of Photogrammetry and Remote Sensing》2003,57(5-6):380

This article considers two types of tools used for the analysis of spatial data: computational tools for grid data and visualization-based interactive exploratory techniques. The main purpose is to demonstrate that computational and visual techniques are complementary, and their combined use in data analysis may produce a synergistic effect. To this end, we describe two example scenarios of data analysis in the evaluation of potential damage from earthquakes and in analysis of forest resources. The analyses were performed with the use of CommonGIS, featuring the availability of powerful geocomputational tools and interactive visualization-related facilities that can be efficiently used in combination in a desktop environment or via the World Wide Web.  相似文献   

First Results from VLF Observations during the Transarctica 2019 Polar Expedition     

Pil’gaev  S. V.  Fedorenko  Yu. V.  Kleimenova  N. G.  Manninen  J.  Nikitenko  A. S.  Larchenko  A. V.  Filatov  M. V.  Lebed’  O. M.  Frolov  I. E.  Kozelov  B. V. 《Geomagnetism and Aeronomy》2020,60(2):212-215

Geomagnetism and Aeronomy - The first results are presented for observations of the VLF emissions (1–15 kHz) conducted at polar latitudes during the expedition Transarctica 2019, which was...  相似文献   

Experimental Research on Wave Transmission over Submerged Rubble-Mound Breakwaters     

左其华  Valeri PENCHEV  李鹏  Dorina DRAGANCHEVA  王登婷 《海洋工程》2008,(4):575-584

This paper discusses some previous, and presents some new experimental results on wave transmission oversubmerged breakwaters. The objective of this study is to evaluate wave transmission coefficient and develop two-dimensional (2D) model as an improvement to the existing wave transmission coefficient models. Factors which affect wave transmission over submerged breakwaters are discussed through series of laboratory experiments. Basic recommendations for evaluation and design of submerged rubble-monud breakwaters are presented.From the test results, calculation formula of wave transmission coefficient is proposed.  相似文献   

A moving group of young stars in Carina–Vela     

Valeri V. Makarov  Sean Urban 《Monthly notices of the Royal Astronomical Society》2000,317(2):289-298

Accurate two-colour photometry and proper motions of 7096 young X-ray stars in the ROSAT All-Sky Survey Bright Star Catalogue, version 1RXS, are extracted from the Tycho-2 Catalogue. The sample is dominated by red main-sequence and possibly pre-main-sequence stars. On a global proper motion convergence map, two features are very prominent: the nearby section of the Gould Belt and the Hyades convergent point. The appearance of the Gould Belt feature with its peak at ( l =2443, b =−126) is quite similar to that of Hipparcos OB stars. When only stars with proper motions drawing close to that point are selected, strong concentrations of stars in the direction of the Sco–Cen complex are found. Another concentration, not corresponding to any known OB association, is detected between the position of the Lower Centaurus Crux and Vela OB2 associations. It is a new young moving group located in Carina and Vela, and a near extension of the Sco–Cen complex. Contrary to the classical Gould Belt OB associations, the Carina–Vela moving group has a considerable geometric depth, the closest members being as near as 30 pc from the Sun. IC 2391, one of the youngest and closest open clusters on the sky, is a part of the Carina–Vela moving group. The Carina–Vela moving group does not link the Sco–Cen complex with the Vela OB associations, because the latter is much more distant than the outer limit of the sample. It is more likely that the young late-type population of the Scorpio–Centaurus–Carina moving group stretches towards the Sun and possibly beyond it.  相似文献   

Spatial Structure of the Illuminated Area of the Auroral Hiss Based on Ground-Based Observations at Auroral Latitudes     

Nikitenko  A. S.  Manninen  J.  Fedorenko  Yu. V.  Kleimenova  N. G.  Kuznetsova  M. V.  Larchenko  A. V.  Beketova  E. B.  Pilgaev  S. V. 《Geomagnetism and Aeronomy》2022,62(3):209-216

Geomagnetism and Aeronomy - The article presents the results of ground-based observations of very low-frequency (VLF) auroral hiss bursts at the Lovozero (Russia) and Kannuslehto (Finland)...  相似文献   

Multi-Waveband Emission Maps of Blazars     

Alan Marscher  Svetlana G. Jorstad  Valeri M. Larionov  Margo F. Aller  Anne Lähteenmäki 《Journal of Astrophysics and Astronomy》2011,32(1-2):233-237

We are leading a comprehensive multi-waveband monitoring program of 34 γ-ray bright blazars designed to locate the emission regions of blazars from radio to γ-ray frequencies. The ‘maps’ are anchored by sequences of images in both total and polarized intensity obtained with the VLBA at an angular resolution of ～0.1 milliarcseconds. The time-variable linear polarization at radio to optical wavelengths and radio to γ-ray light curves allow us to specify the locations of flares relative to bright stationary features seen in the images and to infer the geometry of the magnetic field in different regions of the jet. Our data reveal that some flares occur simultaneously at different wavebands and others are only seen at some of the frequencies. The flares are often triggered by a superluminal knot passing through the stationary ‘core’ on the VLBA images. Other flares occur upstream or even parsecs downstream of the core.  相似文献   

Remobilisation of the continental lithosphere by a mantle plume: major-, trace-element,and Sr-, Nd-, and Pb-isotope evidence from picritic and tholeiitic lavas of the Noril'sk District,Siberian Trap,Russia   总被引：10，自引：0，他引：10  

P. C. Lightfoot  C. J. Hawkesworth  J. Hergt  A. J. Naldrett  N. S. Gorbachev  V. A. Fedorenko  W. Doherty 《Contributions to Mineralogy and Petrology》1993,114(2):171-188

The Late Permian to Early Triassic Siberian Traps have been sampled by drill core (core SG-9) and from surface exposure (section 1F) in the Noril'sk region of the Siberian Platform, Russia. Combined major, trace element, and Nd-, Sr-, and Pb-isotope data on selected samples through the Siberia Trap, offer new chemostratigraphic criteria for the identification and characterisation of two fundamentally different magma types and 9 of the 11 formations of lava developed near Noril'sk. A Lower Sequence of sub-alkalic basalts, tholeiites, and picritic basalts (upwards these are the Ivakinsky, Syverminsky, and Gudchichinsky formations) are overlain by an Upper Sequence of picritic basalts and tholeiites interbedded with tuffs (upwards, these are the Khakanchansky, Tuklonsky, Nadezhdinsky, Morongovsky, Mokulaevsky and Kharayelakhsky formations).The Gudchichinsky and Tuklonsky formations contain both picritic and tholeiitic lavas. The Tuklonsky formation tholeiites and picrites have moderate Gd/Yb (1.6–1.8), low TiO₂ (0.45–0.95 wt%), a significant negative Ta and Nb anomaly (Nb/La =0.42–0.57) and unradiogenic Nd ( _Nd ^CHUR = to -4.6). In contrast, both the Gudchichinsky formation tholeiites and picrites have high Gd/Yb (2.3–3.1), and TiO₂ (1.2–2.3 wt%), no significant Nb or Ta anomaly (Nb/La =0.8–1.1), and radiogenic Nd ( _Nd ^CHUR = to 7.3). The low-Ti and Nb/La, high La/Sm, and unradiogenic Nd-isotope signatures of the picritic Tuklonsky formation lavas and the tholeiitic lavas of the Upper Sequence are characteristic of magmas strongly influenced by material from the continental lithosphere, whereas the high-Ti and Nb/La, low La/Sm and radiogenic Nd-isotope signatures of the Lower Sequence are more comparable to deeper asthenospheric mantle-plume generated lavas similar to oceanic island basalts. The lavas overlying the Tuklonsky formation have mg-numbers of 0.63 to 0.68, and are more evolved than the Tuklonsky (Mg-number < 0.62) and have more radiogenic _Nd ^CHUR (Tuklonsky:-0.03 to-4.66; Mokulaevsky: + 0.60 to + 1.61), but have many of the incompatible trace element features of the Tuklonsky sky type magma. These lavas show a progressive upwards decline in SiO₂ (55–49 wt%), La/Sm (4.6–2.0), and _UR ^Sr ( + 67 to + 13) which has previously been attributed to a decrease in the proportion of crustal material contributed to the magma. This paper explores and alternative model where a component of the crustal contribution might be derived from within an ancient region of the mantle lithosphere as recycled sediment rather than from the overlying continental crust.  相似文献   

The peculiarities of diffusion of the galactic cosmic rays at low energies     

V. N. Fedorenko 《Astrophysics and Space Science》1990,163(2):187-200

I give an interpretation of a result of Simpsonet al. (1988) on the variation with kinetic energyT _i of the mean pathlengthX _m (T _i ) of the galactic cosmic rays (CGRs) in the range 0.1T _i 10.0 GeV nucl^–1. I argue that the data onX _m (T _i ) may be interpreted in terms of a model of GCR diffusion on the one-dimensional Alfvén-wave turbulence, having a cutoff in the spectrum at frequencies _h , where _h is the proton gyrofrequency. The cutoff results in changing of the character of variation of the GCR diffusion coefficientD(T _i )T ^a in the rangeT _i 1 GeV nucl^–1 towards some more complicated variation at 0.1T _i 1.0 GeV nucl^–1 due to the peculiarities of the pitch-angle scattering at 90⁰.  相似文献