Study of the contourite systems of the west Atlantic in the 50th cruise of research vessel <Emphasis Type="Italic">Akademik Ioffe</Emphasis>     

E. V. Ivanova  I. O. Murdmaa  D. G. Borisov  E. A. Seitkalieva  L. D. Bashirova  E. A. Ovsepyan  E. V. Bulycheva  N. V. Simagin  A. V. Krek  D. T. Fidaev 《Oceanology》2016,56(6):888-889

  相似文献   

Assessing the accumulation of sorbed isotope <Superscript>137</Superscript>Cs within the upper components of the fluvial network in the zone of Chernobyl contamination     

M. M. Ivanov  N. N. Ivanova  V. N. Golosov  E. N. Shamshurina 《Geography and Natural Resources》2016,37(4):355-361

We examine the use of two alternative techniques for assessing the redistribution volumes of sorbed ¹³⁷Cs within the upper components of the fluvial network, based on the concept of catchment as a lithodynamical system. In terms of one of them, we made a substantive analysis of changes in reserves on accumulative positions where the ¹³⁷Cs distribution curves showed a significant increase in radionuclide content levels. We carried out a typization o the accumulation surfaces in order to extrapolate data, obtained for a group of soil profiles, to the territory of the entire catchment and to make a direct assessment of the increases in accumulation. An alternative technique was used to assess the volumes of accumulated sediment loads on accumulative positions by analyzing the ¹³⁷Cs distribution curves, and to correlate with denudation zones in the drainage area under consideration. Values of the wash-out rates for the period 1986–2012 have been obtained, which are necessary for the formation of the accumulative layer observed. We calculated the volume of ¹³⁷Cs swept away during 26 years after the Chernobyl accident, based on information regarding the volumes of initial reserves in the denudation zones and a correlation between the erosion rate and a specific reduction in reserves. It is established that the technique on the basis of analyzing the wash-out zones featuring high economical efficiency can be used in assessing ¹³⁷Cs migration for larger territories with relatively low labor-consuming effort.  相似文献   

Concentrically zonal textures in a sample of the Kaidun meteorite     

A. V. Ivanov  M. A. Ivanova  N. N. Kononkova 《Geochemistry International》2007,45(10):957-970

The paper reports the results of the textural and mineralogical studying of clast Kaidun #d6A. The principal minerals of the clast are phyllosilicates, carbonates, and sulfides, but the clast contains no anhydrous silicates. The clast is characterized by extremely high concentration of inclusions, which broadly vary in size, composition, and texture, from completely remelted to practically unchanged when brought to the parent body. The latter group includes two inclusions having a concentrically zonal texture, which have never before been found in meteorites. One of the inclusions consists of serpentine replaced by talc in the margins. The inclusion was formed in relation to silification under the effect of silicon-bearing aqueous fluid at a temperature of more than 300°C. The other inclusion consists of alternating Ca carbonate and phyllosilicate zones. The texture and composition of the inclusion suggest that its genesis was related to the metasomatic alteration of carbonates under the effect of silicon- and alumina-bearing aqueous fluids at temperatures of about 400–500°C. These processes are typical of large differentiated planets, and there are no reasons to expect them in the parent bodies of carbonaceous chondrites, such as Kaidun. Our results obtained on clast #d6A are in good agreement with the hypothesis that the parent body of the Kaidun meteorite was Phobos [1]. Correspondingly, inclusions #d6Aa and #d6Ab likely originated from Mars, as previously examined alkali-rich clasts did. The clast described in this publication seems to originate from the surface regolith of Phobos, which was compacted in the process of the aqueous alteration of the material and subsequently buried at a greater depth.  相似文献   

Interaction of elemental gold surface with fluids: A key to understanding mechanisms of recondensation and mobilization of gold under endogenic and exogenic conditions     

Yu. V. Shchegol&#;kov  V. L. Tauson  V. Ya. Medvedev  M. V. Pochekunina  L. A. Ivanova  S. V. Lipko 《Doklady Earth Sciences》2007,413(2):244-247

  相似文献   

A Distributed Geoprocessing Concept for Enhancing Terrain Analysis for Environmental Modeling     

Bernhardt Schneider  & Daria Martinoni 《Transactions in GIS》2001,5(2):165-178

Geographic Information Systems (GIS) are well suited to support environmental modeling for dealing with space. However, some of the limitations of current GIS are the lack of tools for comprehensive documentation of the models, the inadequate representation of fields, and the deficient methodology for comprehensive management of uncertainty. Using Digital Terrain Modeling and Analysis as an example, this paper proposes an enhanced approach to overcome these drawbacks. It suggests implementing sophisticated functionality for modeling and analysis of fields in special-purpose modules outside monolithic GIS. These modules include three components: (1) an extensive framework for metainformation that allows a sound assessment of the fitness-for-use of digital field representations for environmental modeling applications, (2) an explicit digital representation of the field phenomenon equipped with the appropriate tools for the derivation of data, and (3) the methods to assess the quality of derived data. A standardized interface enables communication between the module and other software components. The presented modular approach combines the functionality of common GIS with highly specialized modeling and analysis tools encapsulating expert knowledge about the represented phenomena.  相似文献   

Metal Concentrations in the Ecosystem and Around Recreational and Fish-Breeding Pond Bugach     

Gladyshev  M. I.  Gribovskaya  I. V.  Ivanova  E. A.  Moskvichova  A. V.  Muchkina  E. Ya.  Chuprov  S. M. 《Water Resources》2001,28(3):288-296

Data of two field studies were used to analyze the concentrations of Na, K, Ca, Mg, Fe, Mn, Zn, Cu, Al, Cr, Ni, Cd, and Pb in the water, bottom deposits, zoobenthos, fish, and macrophytes of the Pond Bugach and in the soils near the pond. It was established that the majority of metals in the soils and bottom deposits correlate and their concentrations are governed by the universal geochemical factors of the region. The heavy metals were recognized that originate from anthropogenic sources and their concentrations were found to exceed the maximum admissible values for different components of the ecosystem. Five types of heavy metals migration were recognized in the soil–bottom deposits–zoobenthos–fish chain and in macrophytes. Statistically significant difference was found to exist between the concentrations of some heavy metals in the muscles of fish species with different food types (crucian carp and perch) as well as between the correlations of metals. The recorded concentrations were compared with the concentrations of metals measured in the last decade in other limnetic ecosystems in Siberia, Europe, North America, and China.  相似文献   

Spectroscopic observations of HD 187399     

G. V. Akhundova  N. A. Ivanova  Kh. I. Novruzova 《Astrophysics》1973,9(4):364-366

  相似文献   

Crystal structure of alloriite     

R. K. Rastsvetaeva  A. G. Ivanova  N. V. Chukanov  I. A. Verin 《Doklady Earth Sciences》2007,415(1):815-819

  相似文献   

Ozone content over the Russian federation territory in 2006     

A. M. Zvyagintsev  N. S. Ivanova  G. M. Krutchenitskii  I. N. Kuznetsova  E. A. Lezina 《Russian Meteorology and Hydrology》2007,32(2):142-146

The review is compiled based on the results of the operation of the Total Ozone (TO) Monitoring System in the CIS and Baltic countries, functioning in the operational regime at the Central Aerological Observatory (CAO). The monitoring system used the data from the national network of filter ozonometers, type M-124, operating under the methodological control of the Main Geophysical Observatory (MGO). The quality control of the entire system is performed based on the observations with the satellite OMI (NASA) equipment. The basic results of TO observations for each month of the fourth quarter of 2006 and for a year as a whole are generalized. Results of regular surface ozone observations in the Moscow region are considered as well.  相似文献   

About the Role of Quinones in the Action of Some Polyphenols on the Streaming of Protoplasm in Nitella sp. Cells     

D. J. Stom  G. G. Ivanova  G. V. Bashkatova  T. P. Trubina  O. M. Kozhova 《洁净——土壤、空气、水》1974,2(5):407-412

The concentration of phenols and quinones which stopped the protoplasmic movement in the Nitella cells after 15 min was determined. The quinones (β-naphthoquinone, α-naphthoquinone, p-benzoquinone, o-toluquinone, o-bromanil) stopped the protoplasmic movement in the concentration of (1 3) 10^?4 M, phenols (m-cresol, p-cresol, hydroquinone, guaiacol, phenol, gallic acid, pyrogallic acid, resorcinol) in the concentration of (0.2 5) 10^?2 M, except catechol – 2 10^?3 M. Very high toxicity of catechol and in the prolonged experiments (3 hours) also of hydroquinone is connected with the action of quinonoid productions of its oxidation. This suggestion is confirmed by the experiments:

• – by adding the phenol solutions to Nitella shoots (catechol, hydroquinone, resorcinol) we observed the greatest increase of oxygen absorption in case of catechol (86%), less in case of hydroquinone (38%), and for resorcinol oxygen absorption practically remained on the control level;
• – the action of catechol, hydroquinone and p-benzoquinone did not take place in the presence of glutathione and cysteine (but not cystine and oxidated glutathione);
• – diethyldithiocarbamate as an inhibitor of o-diphenoloxidase reduced the ability of catechol solutions to stop the protoplasmic movement;
• – the low concentrations of benzoquinones were able to stop the protoplasmic movement;
• – for stopping the protoplasmic movement under the prolonged time of incubation from 15 min to 3 hours there was necessary a lower concentration of solutions of hydroquinone and catechol in comparison with resorcinol.

  相似文献