Effect of the overconsolidation ratio of soils in surface settlements due to tunneling     

Ludmila Strokova 《寒旱区科学》2013,5(5):0637-0643

Construction of urban tunnels requires the control of surface subsidence to minimize any disturbance to nearby buildings and services. Past study of surface subsidence has been limited to mainly empiri...  相似文献   

Electronic geothermal atlases of Asian Russia     

Albert D. Duchkov  Michael Zheleznjak  Ludmila S. Sokolova 《寒旱区科学》2014,6(5):0479-0483

Generalized geothermal data was used to produce two electronic atlases for Asian Russia,Geothermal Atlas of Siberia（GAS）（1995-2000） and Geothermal Atlas for Siberia and Russian Far East（GASRFE）（2009-2012）.The atlases include heat flow maps,temperatures at depths of 0.5,1,2,3,5 km and lower boundary of permafrost.Quantitative values of parameters are presented as isolines（GAS） and symbols（GASRFE）.GAS website is located at the Trofimuk Institute（www.ipgg.sbras.ru/ru/institute/structure/geophysics/natural-fields）.GASRFE provides the most complete geothermal data on Asian Russia,which has been growing for the last 50 years,and is published on the Internet at http：//maps.nrcgit.ru/geoterm.In this atlas,data about the depth of permafrost lower boundary（ ＂zero＂ isotherm） are presented for the first time.  相似文献   

Chironomid-based inference models for estimating mean July air temperature and water depth from lakes in Yakutia,northeastern Russia     

Larisa Nazarova  Ulrike Herzschuh  Sebastian Wetterich  Thomas Kumke  Ludmila Pestryakova 《Journal of Paleolimnology》2011,45(1):57-71

We investigated the subfossil chironomid fauna of 150 lakes situated in Yakutia, northeastern Russia. The objective of this study was to assess the relationship between chironomid assemblage composition and the environment and to develop chironomid inference models for quantifying past regional climate and environmental changes in this poorly investigated area of northern Russia. The environmental data and sediment samples for chironomid analysis were collected in 5 consecutive years, 2003–2007, from several regions of Yakutia. The lakes spanned wide latitudinal and longitudinal ranges and were distributed through several environmental zones (arctic tundra, typical tundra, steppe-tundra, boreal coniferous forest), but all were situated within the zone of continuous permafrost. Mean July temperature (T_July) varied from 3.4°C in the Laptev Sea region to 18.8°C in central Yakutia near Yakutsk. Water depth (WD) varied from 0.1 to 17.1 m. T_July and WD were identified as the strongest predictor variables explaining the chironomid communitiy composition and distribution of the taxa in our data set. Quantitative transfer functions were developed using two unimodal regression calibration techniques: simple weighted averaging (WA) and weighted averaging partial least squares (WA-PLS). The two-component T_July WA-PLS model had the best performance. It produced a strong coefficient of determination (r ² _boot = 0.87), root mean square error of prediction (RMSEP = 1.93), and max bias (max bias_boot = 2.17). For WD, the one-component WA-PLS model had the best performance (r ² _boot = 0.62, RMSEP = 0.35, max bias_boot = 0.47).  相似文献   

Ionisation Durch Erdsatelliten     

Ludmila Třísková 《Studia Geophysica et Geodaetica》1962,6(4):391-399

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Supplementary remarks to ‘on the average depth of formation of weak fraunhofer lines’ by E. Gurtovenko,V. Ratnikova and C. De Jager     

E. A. Gurtovenko  V. A. Ratnikova 《Solar physics》1975,42(1):43-45

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Optimum filtration of anomalous gravity fields     

Ludmila Kubáčková 《Studia Geophysica et Geodaetica》1970,14(2):177-179

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The nature and cause of polarization anomalies of surface waves crossing northern and central Eurasia   总被引：3，自引：0，他引：3  

Anatoli L. Levshin  Michael H. Ritzwoller  Ludmila I. Ratnikova 《Geophysical Journal International》1994,117(3):577-590

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Neoproterozoic ‘anomalous’ kimberlites of Guaniamo, Venezuela: Mica kimberlites of ‘isotopic transitional’ type     

Felix V. Kaminsky  Sergei M. Sablukov  Ludmila I. Sablukova  Dominic M.DeR. Channer 《Lithos》2004,76(1-4):565-590

In Venezuela, kimberlites have so far only been found in the Guaniamo region, where they occur as high diamond grade sheets in massive to steeply foliated Paleoproterozoic granitoid rocks. The emplacement age of the Guaniamo kimberlites is 712±6 Ma, i.e., Neoproterozoic. The Guaniamo kimberlites contain a high abundance of mantle minerals, with greater than 30% olivine macrocrysts. The principal kimberlite indicator minerals found are pyrope garnet and chromian spinel, with the overwhelming majority of the garnets being of the peridotite association. Chrome-diopside is rare, and picroilmenite is uncommon. Chemically, the Guaniamo kimberlites are characterized by high MgO contents, with low Al₂O₃ and TiO₂ contents and higher than average FeO and K₂O contents. These rocks have above average Ni, Cr, Co, Th, Nb, Ta, Sr and LREE concentrations and very low P, Y and, particularly, Zr and Hf contents. The Nb/Zr ratio is very distinctive and is similar to that of the Aries, Australia kimberlite. The Guaniamo kimberlites are similar in petrography, mineralogy and mantle mineral content to ilmenite-free Group 2 mica kimberlites of South Africa. The Nd-Sr isotopic characteristics of Guaniamo kimberlites are distinct from both kimberlite Group 1 and Group 2, being more similar to transitional type kimberlites, and in particular to diamondiferous kimberlites of the Arkhangelsk Diamond Province, Russia. The Guaniamo kimberlites form part of a compositional spectrum between other standard kimberlite reference groups. They formed from metasomatised subcontinental lithospheric mantle and it is likely that subduction of oceanic crust was the source of this metasomatised material, and also of the eclogitic component, which is dominant in Guaniamo diamonds.  相似文献   

Application of Atomic Spectrometric Methods Coupled with Gas Chromatography for Geochemical Exploration     

Nataliya Safronova  Galina Mazo  Galina Korobeinik  Elena Shepeleva  Ludmila Zhiltsova 《Geostandards and Geoanalytical Research》2004,28(2):291-304

This paper presents a scheme of analysis for bottom sediments based on inductively coupled plasma-atomic fluorescence spectrometry and arc discharge atomic emission spectrometry combined with instrumental pyrolysis and gas chromatographic methods (head space analysis) for determining organic matter. The experimental investigation was performed on bottom sediments of the Kuybyshev and Ivankovo reservoirs on the Volga River, used as a drinking water supply. The selective sample dissolution method followed by the inductively coupled plasma-atomic fluorescence spectrometry liquid phase analysis and the arc discharge atomic emission spectrometry solid phase analysis was used to obtain quantitative information on heavy metal speciation in bottom sediments. In the present work we have taken the direct extraction scheme for analysis. It is shown that the proposed combination of instrumental methods is highly effective for revealing natural and anthropogenic components in the composition of organic matter, for conducting preliminary estimation of the binding of heavy metals with organic matter and for assessing activity of organic matter biochemical transformation. The proposed approach enlarges the capabilities for prediction and modelling of the processes in environmental-geochemical investigations.  相似文献   

Mathematical model of the spectral decomposition of periodic and non-periodic geophysical stationary random signals     

Ludmila Kubáčková  Reviewer M. Burda 《Studia Geophysica et Geodaetica》1977,21(1):1-10

Summary A model is discussed for the spectral decomposition of stationary periodic and non-periodic functions, suitable for studying various geophysical signals. The properties of the individual components of the random spectrum of the periodic stationary random function was shown in the geometry of Hilbert space of random quantities, and these were used to construct the periodic continuation of the random stationary function, given in a finite interval.  相似文献