bluuebunny/crossref_metadata_2025 huggingface dataset:
Evolution of mineral formation processes in Lower Vend terrigenous rocks of Nepsko-Botuobinskaya anteclise
Authors: Postnikov A. V. , Postnikova O. V. , Izyurova E. S. , Poshibaev V. V. , Kuznetsov A. S. , Izyurov A. D. , Kozionov A. E.
Published: May 2019

Principal common factors of epigenetic occurrence in Lower Vend rocks of Nepsko-Botuobinskaya anteclise are shown in the article. Evolution of mineral formation processes is stated in the change of mineral paragenesis, which were formed on stages of regional background (stadial) lithogenesis of foundering — diagenesis, early and late katagenesis; and also as a result of local superimposed lithogeneous types complex combination – cataclastic, hydrothermal, metasomatic and dynamothermal activation. Local superimposed processes could acompony the period of Permo-Triassic trap magmatism. High degree transformation of Lower Vend terrigenous rocks of Nepsko-Botuobinskaya anteclise determinates its structure, composition and physical properties specificity, which should be taken into account in process of geological exploration of different mineral deposits.
Reference sections of late‒middle neopleistocene friable sediments in Kamchatka: Present-day state and issue of age, and perspectives of study
Authors: Pevzner M. M. , Yashina O. V. , Smyshlyaeva O. I. , Nechushkin R. I. , Karimov T. D. , Rozhdestvensky O. Yu.
Published: May 2019

Reference sections of friable sediments in central Kamchatka are studied and their present-day state is described. Previous concepts of the Middle Pleistocene age of these sediments are critically examined. Radiocarbon dates performed in the 1980s‒1990s by researchers at the Geological Institute, Russian Academy of Sciences, are revised. It is shown that some (oldest) part of dates did not pass the quality check. Results of the new (2016‒2017) radiocarbon dating agree well with the data accomplished previously and supported later by revision. Based on the combined databank with 65 determinations of different species of the buried organic material and mammal bones, the Late Pleistocene age of sediments is suggested. A new interpretation is proposed for the formation setting of some sequences in the studied sections.
Gossan of the Yubileynoe massive sulfide deposit (South Urals): evidence for formation on the seafloor
Authors: Novoselov K. A. , Belogub E. V. , Sadykov S. A. , Vikentyev I. V.
Published: May 2019

Oxidation zone of the Yubileinoe massive sulfide deposit, South Urals, is buried beneath Jurassic sediments containing coalified plant remains. Mineralogy of gossan of this deposit is marked by the abundance of siderite. The carbon isotope composition (δ13C) in siderite varies from -20.0 to -23.4‰ PDB, which is close to δ13C variation in coals from the overlying sediments (-23.5 to -26.2‰ PDB). The formation of siderite is likely related to interaction between solutions of the Triassic oxidation zone and fermentation products of the organic matter.
Comparative analysis of the East Barents and Sverdrup sedimentary basins
Authors: Levitan M. A. , Antonova T. A. , Domaratskaya L. G. , Koltsova A. V.
Published: May 2019

We have revealed the features of similarity and difference in Mesozoic sedimentation history of the East Barents and Sverdrup sedimentary basins based on sea areas, sedimentary masses per time unit and coefficient of the sand content. During the end of Paleozoic and in Mesozoic times both basins have been located near each other but didn’t merged into the one great basin.
The return of Russian scientists in the Indian Ocean — a multidisciplinary study in the 42nd cruise of RV Akademik Boris Petrov
Authors: Levchenko O. V. , Shapovalov S. M.
Published: May 2019

The 42nd cruise of RV Akademik Boris Petrov was carried out from January 5 to March 29, 2017 along the route Tianjin (China) – Singapore - Suez (Egypt) - Kaliningrad (figure), in which studies of the lithosphere, hydrosphere and atmosphere were made. The expedition was carried out simultaneously with return of the vessel back to Russia (Kaliningrad) after completion of repair in China in December, 2016.
Using the Paratunsky geothermal field to provide heating for Kamchatka
Authors: Kiryukhin A. V. , Zhuravlev N. B.
Published: May 2019

The Paratunsky geothermal field has been in operation since 1964, mostly in a self-flowing mode, with a discharge rate of approximately 250 kg/s of thermal water at temperatures of 70–90°С (47 Mw, with the waste water having a temperature of 35°С). The water drawn from the field is used for local heating, spa heating, and for greeneries in the villages of Paratunsky and Termal’nyi (3000 residents). The potential market of thermal energy in Kamchatka includes Petropavlovsk-Kamchatskii (180000 residents), Elizovo (39 000), and Vilyuchinsk (22 000). The heat consumption in the centralized heating systems for Petropavlovsk-Kamchatskii is 1 623 000 GCal per annum (216 Mw). A thermohydrodynamic model developed previously is used to show that the Paratunsky geothermal reservoir can be operated in a sustainable mode using submersible pumps at an extraction rate of as much as 1375 kg/s, causing a moderate decrease in pressure (by no more than 8 bars) and temperature (by no more than 4°С) in the reservoir. Additional geothermal sources of heat energy may include the Verkhne-Paratunsky and Mutnovsky geothermal fields.
Earthquake july 17, 2017, Mw = 7.8 near the Komandorsky islands and strong seismic manifestations in the western segment of Aleut island arc
Authors: Lutikov A. I. , Rogozhin E. A. , Donzova G. Yu. , Zhukovez V. N.
Published: May 2019

The tectonic position, seismological characteristics and features of the aftershock process of the source of the strongest Near-Aleutian earthquake on July 17, 2017 on the Commander Islands with Мw = 7.8 are considered. The analysis showed that the seismic source according to the distribution of aftershock epicenters in the form of a linearly elongated narrow zone with a length of about 400 km almost completely occupied the northern slope of the Commander island elevation and was located in the Bering fault zone. It covered the whole of this seismic-generating zone up to the transverse structure to the west of the Near Islands (Attu is.). In accordance with the focal mechanisms solution and the nature of the displacements in the foci of the main shock, the strongest foreshocks and aftershocks, the shift in the source was an almost pure right-sided shift. The aftershock process of the July 17 earthquake developed quite enough inertly for an earthquake of such strength. In addition, it has two features in comparison with the aftershock processes of most of the Kuril-Kamchatka earthquakes: 1) low release of the cumulative scalar seismic moment (M0cum aft), which according to various estimates was from 0.75% to 1.0% of the seismic moment of the main shock (M0me); 2) a very slow increase in the deficit in the release of the seismic moment (M0). At the same time, the duration of the quasi-stationary phase of M0cum release in aftershocks, estimated at about ½ year and covering a significant part of the duration of the entire aftershock process of this earthquake, seems unusually long. These features of the aftershock process of the Middle Aleutian earthquake on July 17, 2017 distinguish it from the aftershock processes characteristic of most strong Kuril-Kamchatka earthquakes. In general, its source can be considered as a transform between the two Benioff zones – Aleutian and Kuril-Kamchatka, and not subduction, that is characterise the last two.
2016 volcano eruptions in Kamchatka and the Northern Kuriles and their danger to aviation
Authors: Girina O. A. , Manevich A. G. , Melnikov D. V. , Nuzhdaev A. A. , Petrova E. G.
Published: May 2019

Strong explosive volcanic eruptions are extremely dangerous to the modern jet aircraft as they can produce several cubic kilometers of volcanic ash and aerosols that can be sent to the atmosphere and the stratosphere in several hours to several days during the eruption. In 2016, five from thirty active volcanoes erupted in Kamchatka (Sheveluch, Klyuchevskoy, Bezymianny, Karymsky, and Zhupanovsky) and three from six active volcanoes in the Northern Kuriles (Alaid, Ebeko, and Chikurachki). Effusive volcanic activity was noted at Sheveluch, Klyuchevskoy, Bezymianny and Alaid. All the volcanoes produced explosive activity. Strong explosive events occurred at Sheveluch mainly from September till December. Moderate ash emission had accompanied of Klyuchevskoy’s eruption through March till November. Explosive activity at Karymsky, Zhupanovsky, Alaid, and Chikurachki volcanoes was observed mainly in the first half of the year. The total area covered by ash in 2016 was estimated 600,000 km2, from which 460,000 km2 were related to the eruptions of Kamchatka volcanoes and 140,000 km2 were attributed to the eruption of the North Kuriles volcanoes. The activity at Sheveluch, Klyuchevskoy, and Zhupanovsky was dangerous to international and local airlines as explosions produced ash up to 10-12 km above sea level. The activity at Bezymianny, Karymsky, Alaid, Ebeko, and Chikurachki posed a threat to local aircrafts when explosions sent ash up to 5 km above sea level.
Operational capability assessment for the hyperspectral sensor NA-GS using statistical and simulation modeling
Authors: Zotov S. A. , Dmitriev E. V. , Shibanov S. Yu. , Kozoderov V. V. , Donskoy S. A.
Published: May 2019

Within the framework of the program on Earth remote sensing from space, the hyperspectral camera NA-GS (scientific instrument "Hyperspectrometer") produced by NPO Lepton (Zelenograd, Moscow) will be installed on the Russian segment of the International Space Station (ISS) for experimental testing of the ground-space system for monitoring and forecasting natural and man-made disasters. The practical use of this system is associated with solving certain problems of thematic processing hyperspectral images that must meet certain quality criteria. In this paper, we propose a technique for determining the operational capabilities of NA-GS instrument based on statistical simulation modeling (SSM) data. The concept of the proposed SSM includes the ability to perform model experiments for a test polygon of complex shape, simulation of hyperspectral imaging of selected parts of the polygon with a specified accuracy, and taking into account the clouds and the zenith angle of the sun. The influence of external observation conditions on the quality of hyperspectral images is considered. Numerical experiments were carried out for selected test areas. The analysis of the results obtained confirms reliability of the proposed technique.
The impact of forest fires on the rivers of the Zaigraevskiy district in the Republic of Buryatia
Authors: Ukraintsev A. V. , Plyusnin A. M. , Chernyavskii M. K.
Published: May 2019

Forest fires significantly influence hydrological and hydrochemical regimes of rivers. Based on forest fire statistics and characteristics of river networks, areas for monitoring of river conditions were selected in the Zaigraevskiy district of the Republic of Buryatia. An inverse correlation between precipitation levels and numbers of fires was identified. During 2012, abnormal water levels and flows in the Bryanka river were related to the challenging forest fire situation in the previous year. Finally, macro- and micro-component analyses of water showed that chemical runoff into the rivers increases with pyrogenic damage to water catchment areas.
Spatio-temporal variability of organic matter contents in the waters of the Caspian Sea
Authors: Agatova A. I. , Torgunova N. I. , Serebryanikova E. A. , Dukhova L. K.
Published: May 2019

We analyzed spatio-temporal changes in concentrations and elemental compositions of dissolved organic matter in the waters of the Caspian Sea over the period 2010–2015. These studies showed that over the past 5 years of lowering of sea levels, mean concentrations of Corg and Norg remained virtually unchanged, whereas concentrations of Porg decreased more than three-fold, suggesting a qualitative change in organic matter. Based on data averages, concentrations of Corg, Norg, and Porg in Southern waters were slightly higher than in the North and Middle-Caspian waters during the monitoring period. In deep areas at the border region of hydrogen sulfide occurrence, concentrations of Corg, Norg, and Porg increase. Hence, the presence of hydrogen sulfide in the deep waters of the Derbent and South Caspian basins, and the corresponding increase in organic matter contents, indicates no radical improvement of vertical mixing of the sea in these areas during the eight years of our regression model. Moreover, according to the carbohydrate distribution, organic substances of petroleum hydrocarbons contribute considerably to a common pool.
Physical and chemical properties of bottom sediments in surface waters of Central and South Vietnam
Authors: Zakonnov V. V. , Gusakov V. A. , Sigareva L. E. , Timofeeva N. A.
Published: May 2019

In this study, physical and chemical characteristics of bottom sediments in inland waters of Central and Southern Vietnam were investigated, initially according to granulometric compositions, organic matter contents, bulk densities, and natural moisture contents. The main types of sediments in rivers, lakes, reservoirs, former quarries, and ponds were then identified, and similarities between of physical and chemical properties were identified between bottom sediments from water bodies of Vietnam and those from the Volga cascade reservoirs. Moreover, we show common dependencies in the formation of bottom sediments in reservoirs from humid, arid, and tropical monsoon climates.
Self-oscillating modes of penetration of free or submerged jets through the surface of a liquid
Authors: Karlikov V. P. , Nechaev A. T. , Tolokonnikov S. L.
Published: May 2019

A brief review was conducted of the most significant results of studies performed at the Institute of Mechanics of Moscow State University regarding a new class of unsteady flow of incompressible fluid. Examples include such fluids arising upon the penetration of vertical submerged or free flat and axially symmetric water jets through the surface of water in relatively narrow channels, such as when free thin-walled water jets flowing from a conical slit nozzle with a vertical axis form in a rectangular vessel. A broad range of values of characteristic parameters was found to be generated by the previously unknown self-oscillating flow modes formed in the liquid. Different mechanisms for the occurrence of such modes and characteristics of the dependencies of the self-oscillation period on the main determining parameters were uncovered through empirical experiment and numerical modeling. These mechanisms and characteristics as well as possible applications of the obtained results are presented.
Hydrogeochemical aspects elements behavior under development of the Albynskoe gold field, Amur basin
Authors: Radomskaya V. I. , Radomsky S. M. , Pavlova L. M. , Shumilova L. P.
Published: May 2019

Сomposition of chemical elements in natural waters and rocks of the Albynskoe Gold Field have been studied to elusidate the possible environmental effects of open cast mining. The ore has been found to contain a group of environmentally hazardous elements, which, either because of a considerable concentration in the ore (As, Sb, Mo, W), or because of the high toxicity class (Cd, Be, U) can cause a considerable geochemical load onto the regional ecogeosystem. The natural watercourses in the zone of influence of the field show an excess of the MPC for water bodies used for fishery (MPCfish) in terms of Мо, W, As, as well as high concentrations of Sb and U; the overwhelming majority of the microelements show concentrations below the respective MPCfish or below their detection limits. The analysis of the results of laboratory experiments, simulating the processes of biochemical weathering of ore material by various natural agents, showed that toxic and extremely toxic elements can be leached and dispersed in the zone of influence of deposit
Comprehensive assessment of the recreational-geomorphological potential of the coasts of the White and Baltic Seas
Authors: Mishurinskii D. V. , Bredihin A. V.
Published: May 2019

The approaches to qualitative and quantitative evaluation of recreational-geomorphological potential based on the study of geomorphological safety and attractiveness was applied to the coastal areas of the White and Baltic Seas. The two coasts differ in geomorphological structure, and tourist activities, but they both are attractive for visitors at any time of the year. For more effective conduct of activities in the study areas, it is necessary to take into account the presence of natural monuments, infrastructure development, activity of dangerous processes, historical and cultural characteristics of the area, etc. The best way is to apply different coefficients that give a comprehensive assessment of the territory. The special and integrated indicators obtained in this study can be used for zoning in terms of safety and attractiveness when creating a new tourism product and decision-making related to the foundation and functioning of recreation zones and systems.
Morphological structure of plains subject to ground subsidence on the basis of mathematical morphology of landscapes approach
Authors: Sadkov S. A.
Published: May 2019

Possibility for landscape pattern modeling was demonstrated for areas characterized by active ground subsidence in the eastern part of the Middle Russian Upland (the Kursk Region) as a case study, based on the mathematical morphology of landscapes technique. Applicability of this approach for the case study area was substantiated. The investigation revealed objective difficulties caused by complex morphological pattern of the area compared with the previously proposed canonical models (in terms of the landscape science). The  simultaneous occurrence of morphometrically and physiographically different types of the depressions was considered with subsequent analysis of particular types. Significant differences in morphometric characteristics of forested and meadow depressions as well as low areas without morphologically distinct depressions (so-called “wet spots”) have been found by the application of the variance method. Correspondence of the meadow depressions mean radius sample distribution with log-normal distribution and of the “wet spots” one with normal distribution have been revealed. The forested depressions mean radius sample shows correspondence with both types of statistical distributions.
The expected future super-eruption of the Yellowstone super volcano (USA) is “cancelled” by the Pleistocene glaciation and by the inversion of caldera complex development
Authors: Melekestsev I. V.
Published: May 2019

The review of the reconstructions of the eruptive activity of the Yellowstone Caldera Complex (YCC) in the USA allows to suggests three groups of arguments supporting that the “volcanic super-eruption of Yellowstone” is not likely to occur in the coming hundreds or thousands of years. First is the gradual weakening of the volcanic potential of the magmatic source (which is the frontal lobe of the magmatic super-flow, and not the mantle plume) during the last 2 million yeats. Second is the impact of the repeated occurrence of ice sheets in the YCC area during the past 640 thousand years. Finally, the equivalent super-eruption, in terms of energy released and the mass of exploded material, had already occurred at about 70 thousand years ago, and since that time, the YCC has passed from the volcanic to the hydrothermal evolutionary stage.
Methodology of the multiscale assessment of geomorphological safety of seacoasts, on the example of the south-eastern Baltic coast
Authors: Abdullaeva I. V. , Bredikhin A. V.
Published: May 2019

The article presents a methodological approach to assessing the geomorphological safety of sea coasts based on the close interdependence between geomorphological conditions and active coastal recreational activities. One of the key stages of the proposed assessment is recreational-geomorphological zoning, which results in separation of regions, districts and local areas in relation to relief homogeneity and recreational situation. The suggested approach is based on the quantitative indicators of the environment — conditions of relief formation and the geomorphological properties of the territory. Group of criteria for the situation of relief formation includes lithological, hydrometeorological, human and social factors. Among the group of geomorphological criteria are: morphometric characteristics of the coast, the dynamics of the coast and the activity of slope processes. Resultant geomorphological safety was classified into three classes: the most suitable areas for recreation; territories subject to further refinement; and inconvenience territories that cannot be used at all. The results of the geomorphological safety assessment are designed to increase the effectiveness of recreational environmental planning. The suggested principles of geomorphological assessment can be used not only for the Baltic region, but almost for any coastal region, which may require some correction of criteria.
The application of the scale-space theory for medium-resolution DTM in geological and geotectonic studies
Authors: Rybas O. V. , Gilmanova G. Z.
Published: May 2019

The article presents a technique for identifying structural elements and details of the geological structure in digital terrain models (DTM) based on the theory of scale spaces. With its help, linear, dome-shaped and textural features are singled out from medium-resolution DTM (for example, SRTM03, GMTED2010), allowing to significantly improve the quality of studies related to tectonic and geological mapping and zoning. In general, the theory of scale — spaces is described in application to the solution of these problems and illustarted on the examples of a number of case studies.
Morpholithodynamics of lagoonal straits of the North-Eastern Sakhalin
Authors: Afanasev V. V.
Published: May 2019

The results of the analysis of geospatial and geological information on the structure and dynamics of the lagoon coast of the North-Eastern Sakhalin are presented. On the basis of a number of parameters of the coastal erosion-accumulation processes and migration of lagoon straits during the period 1927–2014. the morpholithodynamics system of the North-Eastern Sakhalin was considered. The volume of sediments transported during the migration of the straits, was estimated with the help of three-dimensional models, in which, parallel with time-averaged areas of erosion and accumulation, additional data were used, namely: bathymetry of the straits and adjacent water area, characteristics of the relief of the barrier forms and geological information obtained as a result of georadar survey and drilling. Georadar data, together with remote sensing data, have made it possible to create a model of sedimentation, which formed the basis for the analysis of the history of the coast formation beyond the period of observations. Currently, we can trace the situation as long as to the middle of the XIXth century.
Diversity of hairpin-like defense peptides from barnyard grass (Echinochloa crusgalli L.) seeds
Authors: Ryazantsev D. Yu. , Rogozhin E. A. , Tsvetkov V. O. , Yarullina L. G. , Smirnov A. N. , Zavriev S. K.
Published: May 2019

The results of structural and functional analyses of harpin-like peptides from the EcAMP group isolated from the barnyard grass (E. crusgalli) seeds are summarized from the viewpoint of their participation in plant innate immunity to environmental biotic stress factors.
Formation of nanoscale sodium dodecahydro-closo- dodecaborate Na2[B12H12] on silicate matrix surface
Authors: Malinina E. A. , Skachkova V. K. , Kozerozhets I. V. , Avdeeva V. V. , Goeva L. V. , Buzanov G. A. , Shaulov A. Yu. , Berlin A. A. , Kuznetsov N. T.
Published: May 2019

The method of nanoscaled sodium dodecahydro-closo-dodecaborate Na2[B12H12] synthesis is presented. The composite is heated to 200°C to yield the desired product, forming with the introduction of triethyl- ammonium salt [Et3NH]2[B12H12] into the silicate matrix of a sodium liquid glass. The morphology and phase composition of the synthesized sample are studied through SEM and X-ray diffraction methods, in comparison to those of a standard salt sample Na2[B12H12]. Based on the obtained data, the sample under study is an amorphous composite, on the surface of which nanoscale crystals of Na2[B12H12] form.
Numerical simulation of the long-term thermal evolution of the nuclei of short-period comets:using the nucleus of comet 67p/Churyumov–Gerasimenko as an example
Authors: Marov M. Ya. , Rusol A. V. , Dorofeeva V. A.
Published: May 2019

Using numerical models, we have studied what depth of the outer layer the comet nuclei are degassed to when they are in orbits whose perihelion is close to the Sun for tens of years. The problem is topical, because it helps to understand how much the experimentally obtained results on the composition of comet comas depend on how long the comet is in its present-day orbit and how adequately the data obtained reflect the composition of comet nuclei as a whole. The proposed approach, which is demonstrated using comet 67P/Churyumov–Gerasimenko as an example, is based on a 3D comet nucleus surface relief model and takes into account not only its orbital motion, but also its diurnal rotation. The propagation of heat in the nucleus subsurface layers is described by a 1D heat conduction equation for a porous rock-ice composition of matter. Based on this approach, we have derived the temperature distributions in the subsurface layers for several surface patches located in the Ma’at region in 20 revolutions around the Sun, ~130 years.
The first petrological evidence of subduction at the western margin of the Siberian сraton
Authors: Likhanov I, I, , Kozlov P. S. , Savko K. A. , Zinoviev S. V. , Krylov A. A.
Published: May 2019

The discovery of relics of glaucophane schist in high-pressure tectonites of the suture zone of Yenisei Ridge has provided evidence for a Cordillera-type convergent boundary controlled by subduction of the oceanic crust beneath the continental margin on the western side of the Siberian Craton. According to the microtextural patterns of rocks and the results of geothermobarometry, two stages of metamorphism were distinguished. The formation of high-pressure tectonites indicates the early stage in the evolution of the Paleoasian Ocean and the final stage in the Neoproterozoic history of the Yenisei Ridge including completion of the accretion–subduction processes on the western margin of the Siberian Craton.
The mechanism of disordered graphite formation in uph diamond-bearing complexes
Authors: Shchepetova O. V. , Korsakova A. V. , Zelenovskiy P. S. , Mikhailenko D. S.
Published: May 2019

Kyanite gneiss from the "New Barchinsky" locality (Kokchetav Massif) was studied in detail. This rock is characterized by zonal distribution of the C and SiO2 polymorphs in kyanite porphyroblasts: (1) porphyroblast cores with graphite and quartz inclusions; (2) clean overgrowth zone with inclusions of cuboctahedral diamond crystals. The Raman mapping of SiO2 polymorphs originally showed the presence of an association of disordered graphite + coesite “prohibited” in HT diamond-bearing rocks. Graphitization of diamond is the only likely mechanism of the disordered graphite formation in HT diamond-bearing rocks. However, the absence of disordered graphite in association with diamond in kyanite porphyroblasts from kyanite gneiss from the "New Barchinsky" locality eliminates the process of diamond graphitization at the retrograde stage. Most likely, crystallization of disordered graphite occurred at the retrograde stage from the UHP C-O-H fluid.
Circadian rhythms and locomotor activity of smolts of the european river lamprey lampetra fluviatilis (l.)
Authors: Zvezdin A. O. , Pavlov D. S. , Kucheryavyy A. V. , Tsimbalov I. A.
Published: May 2019

Locomotor activity was investigated in smolts of the European river lamprey at alternation of light and darkness (12/12 h) and in the dark. Two groups of smolts were discerned differing in the level of locomotor activity. The presence of the circadian rhythm in smolts has been revealed, and its role in downstream migration has been shown. The locomotor activity leading smolts to channel flow increases with decreasing illumination at evening twilight. The period of high nocturnal activity is completed a short time before morning twilight, under the action of the individual circadian rhythm. This decreases the probability of impact of predators on migrating smolts.
Synthesizing spacecraft orbits with high inclinations using Venusian gravity assists
Authors: Golubev Yu. F. , Grushevskii A. V. , Koryanov V. V. , Tuchin A. G. , Tuchin D. A.
Published: May 2019

An adaptive, semi‑analytical, and geometrically clear method for synthesis of sequences of Venusian gravity‑assist maneuvers setting the desired inclination of a spacecraft orbit is proposed. The geometric constraint on the maximum possible inclination of a spacecraft orbit, which depends on the asymptotic spacecraft velocity relative to Venus, and the dynamic constraint (arising when a gravity‑assist maneuver is performed) on the angle of rotation of the vector of asymptotic velocity relative to Venus are considered simultaneously.
Common neoproterozoic–early paleozoic evolution of ore-bearing sedimentary complexes in the southern Siberian craton
Authors: Budyak A. E. , Skuzovatov S. Yu. , Tarasova Yu. I. , Wang Kuo-Lung , Goryachev N. A.
Published: May 2019

A comparison of the lithological-geochemical parameters for the deposits of the Dalnetaiga series of the Bodaibo synclinorium (the Buzhuikhta and Khomolkho suites) and the Olokit structural-formation zone (the Itykit and Ondok suites), hosting polymetallic deposits (Kholodnin, Ioko-Rybach’e), along with the obtained geochronological LA-ICP-MS U–Pb age estimates of the Ondok suite (~600 Ma), indicates their similar stratigraphic position in the Neoproterozoic in Southern Siberia. At the first stage of formation of polymetallic and gold-ore objects, the siderochalcophylic trend is considered to have appeared synchronously in the two structural zones, which could have been caused by the hydrothermal activity in the backarc basin of the Olokit structure.
Paleoarchean U–Pb (SIMS SHRIMP-II) age of mafic granulites of the bug complex (Ukrainian shield)
Authors: Lobach-Zhuchenko S. B. , Kaulina T. B. , Marin Yu. B. , Yurchenko A. V. , Skublov S. G. , Egorova Yu. S. , Galankina O. L. , Sergeev S. A.
Published: May 2019

Mafic granulites (metamorphosed tholeite-komatiite volcanic rocks) represent the inclusions in gneissenderbite of the Bug complex (southwest of the Ukrainian shield). The studied mafic inclusion has two zircon generations of magmatic origin that yield, respectively, SHRIMP zircon U–Pb ages of 3628±58 Ma and 2845±65 Ma. The first age is the oldest date the earliest stage of basic magmatism on the Ukrainian shield. The age of the second zircon is interpreted as a result of partial melting, synchronous with the metamorphism in the area.
Numerical estimations of desalinated seawater modification using Laptev sea shelf seawater as the example
Authors: Dubinina Е. О. , Miroshnikov А. Yu. , Kossova S. А. , Flint M. V.
Published: May 2019

A new model for describing the behavior of the isotope (d18О, dD) parameters of desalinated seawater during freezing is proposed. The model was tested using the Laptev Sea shelf waters, which are actively desalinated by the Lena river input and modified by the freezing and ice removing. It is shown that taking into account the modification process leads to the correction of estimates of the fraction of fresh water input up to 20%. A criterion for determination of model availability is proposed.
Tolerance of potato plants to chloride salinity is regulated by selective light
Authors: Kovtun I. S. , Efimova M. V. , Malofii M. K. , Kuznetsov V. V.
Published: May 2019

Compared the response of the plant Solanum tuberosum L. mid-varieties Nakra to chloride salinity which depending on lighting conditions. Regenerated plants were produced in vitro from apical meristem and grown on half-strength Murashige and Skoog medium using a hydroponic unit in controlled-climate conditions. At the age of six weeks, the plants were exposed to salt stress (125 mM NaCl, 7 days); at the same time, plants were grown on white light with red or blue light. Plant response to salt stress was estimated by growth and physiological parameters. Potato plant tolerance to chloride salinity rose after short-term exposure to blue light, which has been first shown in this study. The protective effect of blue light was based on its ability to stimulate the accumulation of low-molecular weight organic compounds with antioxidant activity.
Nonlinear wave and cavitation processes and their effect on the mechanical properties of viscous solutions
Authors: Ganiev S. R. , Kuznetsov I. S. , Shmyrkov O. V.
Published: May 2019

In this paper, we present experimental results on the effect of nonlinear wave and cavitation processes occurring in flowing working parts of hydrodynamic generators of vortex and flat types with flow bodies of various shapes on the physicomechanical properties of a clay suspension. The model of the vortex-type generator with tangential and radial channels for feeding the working fluid of the generator, which is a flat channel with three bodies of flow around a cylindrical shape, was subjected to research.
Variations of the 238U/235U isotope ratio in metasedimentary rocks and evidence of changes in sedimentation conditions during the Ediacaran period of the Neoproterozoic
Authors: Chugaev A. V. , Chernyshev I. V. , Budyak A. E. , Mandzhieva G. V. , Sadasyuk A. S. , Gareev B. I.
Published: May 2019

The isotopic composition of uranium is a new geochemical indicator that facilitates reconstruction of the redox conditions of geological processes. In this paper the results of study of the 238U/235U isotope ratio in the Neoproterozoic metasedimentary rocks of the Baikal–Patom fold belt (Northern Transbaikalia) were obtained using the MC-ICP-MS method and 233U+236U double spike. The scale of 238U/235U ratio variations (δ238U = –0.37 to –0.11‰) is within the range of (–0.39 to +0.15‰), typical of metasedimentary terrigenous rocks of marine origin. In terms of the δ238U values, uranium of the BPB rocks studied is heavier than seawater uranium (δ238U = –0.41 ± 0.03). There is a correlation between the δ238U value in the rocks and their position in the stratigraphic section. Variations of the 238U/235U ratio in the terrigenous-carbonate sequences of BPB indicate that the sedimentation conditions changed and euxinic conditions were established in the course of evolution of the paleobasin in the Late Ediacarian Period.
Dynamics of dissolved inorganic carbon and co2 fluxes between water and atmosphere in the main channel of the ob river
Authors: Pipko I. I. , Pugach S. P. , Savichev O. G. , Repina I. A. , Shakhova N. E. , Moiseeva Y. A. , Barskov K. V. , Sergienko V. I. , Semiletov I. P.
Published: May 2019

The results of investigation of the carbonate system parameters dynamics in the middle and lower reaches of the Ob River in July 2016 were analyzed. The distributions of the carbonate characteristics of the river waters were found to follow a steady latitudinal trend determined by the landscape-geochemical conditions of the drainage basin and by the permafrost distribution. The first field data on the magnitude and direction of the CO2 fluxes in the river water-atmosphere system in this region were presented. It was shown that the waters in the middle and lower reaches of the river are multiply supersaturated with CO2 with respect to its atmospheric content, and the daily average evasion reaches 625,9 mmol m-2 day-1 at an average value of 102,1 mmol m-2 day-1. It was determined that the waters of the Ob River in the studied reaches are a significant CO2 source to the atmosphere; according to conservative estimates, the total flux in July was 2 ⋅ 1011 g of carbon in the form of CO2.
Mineralogical-geochemical types and 190Pt-4He age of ferroan platinum of placers of the Anabar River basin, northeastern part of the Siberian Platform
Authors: Okrugin A. V. , Yakubovich O. V. , Gedz A. M. , Zemnukhov A. L. , Ivanov P. O.
Published: May 2019

Typical features of platinum group minerals (PGMs) and the results of 190Pt–4He dating of the Fe–Pt solid solutions are presented for complex gold–platinum–diamond placers with unidentified sources of the Anabar River basin. For the first time, the 190Pt–4He isotopic system is used for determination of the possible age of the primary source of a PGM placer from the example of ferroan platinum with a disordered structure along with isoferro- platinum. The PGMs of these placers mostly include ferroan platinum and isoferroplatinum and rare Ru–Ir–Os alloys. The calculated bulk composition of the silicate inclusion of Ir platinum corresponds to the rocks of the ijolite–melteigite series. The 190Pt–4He age of the Fe–Pt solid solution grains is 261 ± 13 Ma. Thus, our data indicate the relation between placer PGMs of the Anabar River basin and Permian-Triassic complexes of alkaline-ultramafic rocks.
Primal-dual accelerated gradient descent with line search for convex and nonconvex optimization problems
Authors: Guminov S. V. , Nesterov Yu. E. , Dvurechensky P. E. , Gasnikov A. V.
Published: May 2019

In this paper a new variant of accelerated gradient descent is proposed. The proposed method does not require any information about the objective function, uses exact line search for the practical accelerations of convergence, converges according to the well-known lower bounds for both convex and non-convex objective functions and possesses primal-dual properties. We also provide a universal version of said method, which converges according to the known lower bounds for both smooth and non-smooth problems.
On complexity of reductive group actions over algebraically non-closed field and strong stability of the actions on flag varieties
Authors: Zhgoon V. S. , Knop F.
Published: May 2019

We annonce the results generalizing the Vinberg's Complexity Theorem for the action of reductive group on an algebraic variety over algebraically non-closed field. Also we give new results on the strong k-stability for the actions on flag varieties.
Variations of cosmogenic radionuclide production rates in chondrites of known orbits
Authors: Ustinova G. K. , Alexeev V. A.
Published: May 2019

The results of multiyear investigations of cosmogenic radionuclide production rates along the orbits of 42 chondrites, fallen successively to the Earth in 1959-2016 are presented. They constitute a long set of homogeneous data, statistical smoothing of which demonstrates some main regularities of distribution and variation of the galactic cosmic rays (GCR) with energy > 100 MeV in the internal (< 5 AU) heliosphere. This set is exclusive, and it has timeless importance for all the future investigations of magneto-hydrodynamic peculiarities of the GCR solar modulation mechanism. Analysis of 26Al contents in 10 chondrites of known orbits allowed us to educe a spatial profile of the GCR intensity (E > 100 MeV), averaged over a 1 My in the internal heliosphere, testifying to permanent development and dissipation of a layer of the solar wind magnetic irregularities, which efficiently modulates cosmic radiation. It suggests a constancy of magneto-hydrodynamic environment in the Solar system at least for the last million years.
Synthesis and properties of new 2,3,5,6-tetraaminopyridine based polyheteroarylenes
Authors: Ponomarev I. I. , Razorenov D. Yu. , Ponomarev Iv. I. , Volkova Yu. A. , Skupov K. M. , Lysova A. A. , Yaroslavtsev A. B.
Published: May 2019

Two new polyheteroarylenes (polydiimidazopyridines) based on 2,3,5,6-tetraaminopyridine and aromatic dicarboxylic acids were synthesized and characterized. The polymers show high viscosity properties and exceptional thermooxidative stability. Polydiimidazopyridine containing a phosphoric acid group possesses excellent filmforming properties and can be processed to proton conducting membranes that have record high proton conductivity in the temperature range of 20-200 °C after doping with orthophosphoric acid.
Epitaxial growth, morphology and temperature stability of quartzlike dioxide germanium crystals
Authors: Balitsky V. S. , Balitsky D. V. , Pushcharovsky D. Yu. , Balitskaya L. V. , Setkova T. V. , Dokina T. N.
Published: May 2019

The conditions and mechanisms of epitaxial growth of quartz-like a-GeO2 crystals on quartz substrates using an evaporative-recirculation method are considered. Relatively homogenous a-GeO2 crystals weighing up to 200 g are grown at a growth rate of up to 0.3 mm/day. It is established that molecular adhesion at the boundary between the quartz substrate and the overgrown layer of a-GeO2 cannot prevent its transition to a stable poorly soluble rutile-like phase. This makes it impossible to grow high-germanium quartz single crystals industrially using a mixture of quartz and quartz-like a-GeO2 as a nutrient. However, this process can be implemented if other more soluble germanium-containing compounds, such as quartz-like Si-containing germanium-oxide, are found.
Isotopic composition of Nd, Pb, and Sr in modern bottom sediments of the Barents Sea
Authors: Maslov A. V. , Kuznetsov A. B. , Politova N. V. , Kozina N. V. , Novigatsky A. N. , Shevchenko V. P.
Published: May 2019

The isotopic characteristics ((Nd, 207Pb/206Pb, and 87Sr/86Sr) of the modern bottom sediments sampled in the Barents Sea during the 67th voyage of the R/V “Akademik Mstislav Keldysh” are considered. It is shown that the major contribution to the formation of the sediments in the central Barents Sea is made by rocks of the North European continental margin, which are found in the zone of influence of the North Cape Current. The values of (Nd, and 87Sr/86Sr are lower in the bottom sediments of this part of the sea than the corresponding characteristics of sedimentary material incorporated into ices and carried by the Transpolar Drift Stream. This allows one to conclude that such material has not contributed much to the sedimentation in the Barents Sea.
Controllability and optimal controllability for operator equations of the first kind in (B)-spaces. examples for ODE in Rn
Authors: Prilepko A. I.
Published: May 2019

For control and observation problems considered for operator equations of the first kind in Banach spaces, an controllability criterion is stated. In the case of reflexive strictly convex (B)-spaces, the BUME method and the method of monotone mappings are used to find optimal controls and an abstract maximum principle is formulated. The indicated problems for ODE systems in Rn are investigated as an example.
Laboratory modeling of the giant gravitational shift of gamma-radiation frequency
Authors: Fortov V. E. , Shvartsburg A. B.
Published: May 2019

The control spectral shifts of resonant radiation frequency due to spatially non-uniform and non-stationary centrifugal acceleration, stipulated by the travel of radiation source along the centrifugal radius or modulation of the rotation frequency, are examined. These spectral variations pave the way to modeling of effects of non-uniform and non-stationary gravity field. The perspectives of flexible control of spectral lines shifts for the analysis of fine structure of radiation and absorption spectra are considered.
Computer simulation of the structure of multicomponent oxide-fluoride melts
Authors: Gelchinski B. R. , Dyul'dina E. V. , Selivanov V. N. , Leontiev L. I.
Published: May 2019

Based on the experimental data on the density, the molecular dynamics simulation of multicomponent oxidefluoride melts was first carried out in the ionic bond model approximation: SiO2-CaO-Al2O3-MgO-CaF2- Na2O-K2O-FeO. The results are discussed and compared with the experimental and calculated data. An increased diffusion mobility of fluorine ions as well as ions of alkali metals in comparison with other elements has been revealed. It is shown that the computer model allows obtaining adequate information about the structure of the melt of a certain chemical composition, as well as a fairly realistic picture of the atomic structure of the slag melt, which, according to the main parameters, agrees well with the data of the diffraction experiment.
Early permian age of nepheline syenites of the Korgere-Daba massif (Sangilen highlands, Tuva)
Authors: Nikiforov A. V. , Salnikova E. B. , Yarmolyuk V. V. , Kotov A. B. , Sugorakova A. M. , Anisimova I. V.
Published: May 2019

This paper reports on geochronological U–Pb studies of baddeleyite from nepheline syenite of the Korgere–Daba alkaline massif, which is the largest massif within the Sangilen Highlands (Tyva). The established age of rocks, 295 ± 1 Ma, indicates that, in the Early Permian, undersaturation by silica magmatism occurred in the region in addition to the alkaline-granite magmatism (Ulug–Tanzek, etc.). This age furthermore points to the need to make corrections in the conceptions of a petrophysical type for the Devonian Sangilen complex, which is traditionally distinguished in this region. Until now, the Korgere–Daba massif has been considered in this regard.
Ordovician gabbro-tonalite-trondhjemite complex and associated volcanic rocks in the paleozoic suture between Urals and Kazakhstan
Authors: Ryazantsev А. V.
Published: May 2019

This paper reports new data on the Early Ordovician age established for granitoids of the gabbro-tonalite-trond- hjemite complex in the Denisovka ophiolite zone (suture) on the boundary between the Paleozoic structures (Paleozoides) of the Urals and Kazakhstan. The ages of 482.6 ± 3.6 Ma and 486.2 ± 6.7 Ma were established by the U/Pb method (SHRIMP II) on the age data for zircon extracted from granitoids. The plutonic complex associates with the Early-Middle Ordovician effusive complex, composed of a series of rocks differentiated from basalts to rhyolites. The volcano-plutonic association was formed in the supra-subduction settings, as is evidenced by the composition of the rocks.
Physical fatigue and the morfofunctional state of myocardium in experimental chronic stress
Authors: Kondashevskaya M. V. , Tseylikman V. E. , Komelkova M. V. , Lapshin M. S. , Sarapultsev A. P. , Lazuko S. S. , Kuzhel O. P. , Manukhina E. B. , Downey H. F. , Chereshneva M. V. , Chereshnev V. A.
Published: May 2019

The relationship between skeletal muscle fatigue and morpho-functional alterations in the myocardium was analyzed for the first time in Wistar male rats exposed to chronic stress. Post traumatic stress disorder (PTSD) was associated with signs of increased oxidative stress, which apparently induced the changes in cardiomyocyte structural components and the acceleration of skeletal and muscular fatigue.
On the independence numbers of some distance graphs with vertices in {-1, 0, 1}^n
Authors: Raigorodskii A. M. , Shishunov E. D.
Published: May 2019

New estimates for the independence numbers of distance graphs with vertices in B {-1, 0, 1}n are obtained.
Speedup of a Chaplygin top by means of rotors
Authors: Borisov A. V. , Kilin A. A. , Pivovarova E. N.
Published: May 2019

In this paper we consider the control of the motion of a dynamically asymmetric unbalanced ball (Chaplygin top) by means of two perpendicular rotors. We propose a mechanism for control by periodically changing the gyrostatic momentum of the system, which leads to an unbounded speedup. We then formulate a general hypothesis of the mechanism for speeding up spherical bodies on a plane by periodically changing the system parameters.