National Academy of science of Kyrgyz Republic

Bishkek, Kyrgyzstan

National Academy of science of Kyrgyz Republic

Bishkek, Kyrgyzstan
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Urusov R.M.,National Academy of science of Kyrgyz Republic | Urusova I.R.,National Academy of science of Kyrgyz Republic
Physics of Plasmas | Year: 2016

Within the frameworks of non-stationary three-dimensional mathematical model, in approximation of a partial local thermodynamic equilibrium, a numerical calculation was made of characteristics of DC electric arc burning in a cylindrical channel in the uniform external axial magnetic field. The method of numerical simulation of the arc of helical shape in a uniform external axial magnetic field was proposed. This method consists in that that in the computational algorithm, a "scheme" analog of fluctuations for electrons temperature is supplemented. The "scheme" analogue of fluctuations increases a weak numerical asymmetry of electrons temperature distribution, which occurs randomly in the course of computing. This asymmetry can be "picked up" by the external magnetic field that continues to increase up to a certain value, which is sufficient for the formation of helical structure of the arc column. In the absence of fluctuations in the computational algorithm, the arc column in the external axial magnetic field maintains cylindrical axial symmetry, and a helical form of the arc is not observed. © 2016 Author(s).

Engel'sht V.S.,National Academy of science of Kyrgyz Republic | Muratalieva V.Z.,Kyrgyz State Technical University
High Temperature | Year: 2017

The thermal transformation of the pyrolysis–condensation–rankinite synthesis process at a normal pressure is considered in detail. Rankinite pyrolysis is performed with a step-by-step increase in enthalpy (TERRA software system). Rankinite pyrolysis components condense on a surface with temperature Т = 298.15 K. Condensate components are equivalent to pyrolysis components. Wollastonite and limestone can precipitate upon condensation to form a mineral deposit. Synthesis is performed by mixing the condensate components. The components and heat of chemical reactions, the enthalpy, the temperature, and the heat content are determined. It is shown that the decomposition of rankinite (Тdec = 2598.36 K), wollastonite (Тdec = 3662.7 K), and limestone (Тdec = 3680–3810 K) occurs in the process of synthesis and pyrolysis at a constant temperature. The complete pyrolysis–condensation–synthesis process picture typical for various compounds is given. © 2017, Pleiades Publishing, Ltd.

Duulatov E.,Xinjiang Institute of Ecology and Geography | Duulatov E.,University of Chinese Academy of Sciences | Duulatov E.,National Academy of science of Kyrgyz Republic | Xi C.,Xinjiang Institute of Ecology and Geography | And 5 more authors.
International Journal of Geoinformatics | Year: 2016

One of the important problems of Geographical Science in the XXI century is the study of quantitative and qualitative changes observed in the land use. In this study, we present two datasets of land use/cover in the Jumgal District derived from Landsat TM and OLI/TIRS images in 1996 and 2014. We used these data to investigate changes in land use/cover between 1996 and 2014. The satellite data has been geocoded to the Universal Transverse Mercator (UTM) coordinate system, Zone 43 North, World Geodetic System (WSG-84) coordinate datum. The information provided by satellites to quantify the various parameters of land use of the district has been evaluated by applying various image-processing techniques. The images were classified using Maximum Likelihood classification method and mapped using ArcGIS 10.1. From 1996 to 2014, the water body's area increased by 530 ha (98.1 %); agriculture area decreased by 9720 ha (14.4 %); mixed forest decreased by 7010 ha (33.3 %); wetland decreased by 1080 ha (9.5%); grassland increased by 540 ha (0.2 %); barren land increased by 18360 ha (14.3 %); and perennial snow/ice decreased by 1620 ha (16 %). The overall accuracies for 1996 and 2014 were respectively 97 % and 92 % with Kappa Statistics of 96 %, and 90 %. User and producers’ accuracies of each information class ranged from 77 % to 100 % in most cases. From these findings, it is highly recommended that the local government initiate measures to protect the forest in Jumgal district whose continuous retreat would expose the land to erosion and other related environmental concerns. © Geoinformatics International.

Korzhenkov A.M.,Russian Academy of Sciences | Kol'chenko V.A.,Kyrgyz Russian Slavic University | Luzhanskii D.V.,National Academy of science of Kyrgyz Republic | Abdieva S.V.,National Academy of science of Kyrgyz Republic | And 8 more authors.
Izvestiya, Physics of the Solid Earth | Year: 2016

We carried out archaeoseismological studies in the Southern Issyk-Kul region (Kyrgyz Tien Shan) and obtained radiocarbon datings of the collected samples. These data suggest that the sources of strong earthquakes have occurred in this territory in the 11th and (probably) 16th centuries. These earthquakes had magnitude M ≥ 7 and seismic intensity of at least I ≥ 9. The sources of these earthquakes were associated with the local adyr (piedmont) faults—components of the Pre-Terskei border fault. Our results demonstrate considerable underestimation of the seismic hazard for the South Issyk-Kul region in the latest Seismic Zoning Map of Kyrgyz Republic (2012), which should be taken into account in the construction of the new seismic zoning map for Kyrgyzstan. © 2016, Pleiades Publishing, Ltd.

Korzhenkov A.M.,Russian Academy of Sciences | Abdieva S.V.,Kyrgyz Russian Slavic University | Fortuna A.B.,National Academy of science of Kyrgyz Republic | Charimov T.A.,National Academy of science of Kyrgyz Republic | Yudakhin A.S.,Russian Academy of Sciences
Russian Geology and Geophysics | Year: 2015

Moraines studied in the Chon-Kyzylsuu River valley (southeastern Lake Issyk-Kul region, Tien Shan) were mobilized during historic and prehistoric large earthquakes. Seismic triggers of moraine mobilization included the M > 8 Kebin earthquake of 1911 and prehistoric events that produced rockslides, landslides, and multiple fault scarps. Rockslides in the Chon-Kyzylsuu basin are located in the hanging wall of the Terskey border thrust fault. The observed deformation results from at least four prehistoric earthquakes in the second half of the Holocene (early 20th century BC, early 11th century BC, middle 8th century BC, and early 2nd century BC), with local shaking intensity I > 7. © 2015 V.S. Sobolev IGM, Siberian Branch of the RAS. Published by Elsevier B.V.

Kustareva L.A.,National Academy of science of Kyrgyz Republic | Naseka A.M.,Saint Petersburg State University
Aquatic Ecosystem Health and Management | Year: 2015

The territory of Kyrgyz Republic (or Kyrgyzstan) is interesting from a zoogeographical point of view, as it straddles several major ecoregions: Balkhash Lake basin, Chu River drainage, Lake Issyk-Kul basin, Talas-Ters drainage, Upper Syr Darya system, Upper Amu Darya system and Tarim basin. Species composition of fish faunas of all ecoregions are discussed and endemic species and subspecies listed. The degree of endemism is notable, reaching 55 and 70% in the Talas River and Issyk-Kul Lake ecoregions, respectively. Some aspects of human impact on native fish populations are analysed, including the introduction and establishment of exotic species that dominate some lakes and reservoirs, fisheries and aquaculture. A review of fishery resources management underlines the need to formulate a compromise strategy for the conservation of unique native fish communities, and the development and management of capture fisheries, based on both native and exotic species, and aquaculture in Kyrgyzstan. © 2015 AEHMS.

Korjenkov A.M.,National Academy of science of Kyrgyz Republic | Korjenkov A.M.,Russian Academy of Sciences | Kol'chenko V.A.,National Academy of science of Kyrgyz Republic | Rott P.G.,University of Bonn | Abdieva S.V.,National Academy of science of Kyrgyz Republic
Geotectonics | Year: 2012

The data presented in this paper show that in historical time the Chuy Basin in Kyrgyzstan was repeatedly subjected to strong earthquakes, which affected the inhabitants and the economic and political situation at that time. The deformed buildings in the Novopokrovka site of ancient settlements situated in the central part of the basin unequivocally indicate seismic damage and subsequent abandonment of the settlement. The earthquake happened at the end of the Karakhanid epoch (the end of the 12th century A. D.). The intensity of seismic oscillations (I = VIII-IX) at the site was reinforced by unfavorable engineering geology conditions. The source of the earthquake was probably related to displacements along the piedmont Ysyk-Ata Fault located to the south of the site. © 2012 Pleiades Publishing, Ltd.

Pogrebnoi V.N.,National Academy of science of Kyrgyz Republic | Golovkov V.P.,Russian Academy of Sciences | Zvereva T.I.,Russian Academy of Sciences | Mozoleva E.L.,National Academy of science of Kyrgyz Republic | Moldobekova S.,National Academy of science of Kyrgyz Republic
Geomagnetism and Aeronomy | Year: 2010

The results of investigations of the latitudinal distribution of annual variation of the geomagnetic field level in the seasons of 1964 (International Quiet Sun Year) using the data from 95 world magnetic observatories located at various longitudes in the latitude range 83° N-90° S are reported. The latitudinal features of the X, Y, and Z components of the geomagnetic field have been analyzed. It has been shown that the amplitudes (summer-winter differences) of the annual variation are maximal in the polar regions, decrease continuously to zero towards the equator, and are identical for both the Northern and Southern hemispheres with a half-year delay (local summer). The amplitudes of the equinox-winter difference in the equinox periods are smaller than those in summer, but are manifested simultaneously in the Northern and Southern hemispheres. An equivalent circumpolar current system has been constructed, which is responsible for the annual variation of the geomagnetic field level. Its parameters have been determined. © 2010 Pleiades Publishing, Ltd.

Wilkins M.R.,Imperial College London | Aldashev A.A.,National Academy of science of Kyrgyz Republic | Wharton J.,Imperial College London | Rhodes C.J.,Imperial College London | And 15 more authors.
Circulation: Cardiovascular Genetics | Year: 2014

Background-Human variation in susceptibility to hypoxia-induced pulmonary hypertension is well recognized. Highaltitude residents who do not develop pulmonary hypertension may host protective gene mutations. Methods and Results-Exome sequencing was conducted on 24 unrelated Kyrgyz highlanders living 2400 to 3800 m above sea level, 12 (10 men; mean age, 54 years) with an elevated mean pulmonary artery pressure (mean±SD, 38.7±2.7 mm Hg) and 12 (11 men; mean age, 52 years) with a normal mean pulmonary artery pressure (19.2±0.6 mm Hg) to identify candidate genes that may influence the pulmonary vascular response to hypoxia. A total of 140 789 exomic variants were identified and 26 116 (18.5%) were classified as novel or rare. Thirty-three novel or rare potential pathogenic variants (frameshift, essential splice-site, and nonsynonymous) were found exclusively in either ≥3 subjects with high-altitude pulmonary hypertension or ≥3 highlanders with a normal mean pulmonary artery pressure. A novel missense mutation in GUCY1A3 in 3 subjects with a normal mean pulmonary artery pressure encodes an α1-A680T soluble guanylate cyclase (sGC) variant. Expression of the α1-A680T sGC variant in reporter cells resulted in higher cyclic guanosine monophosphate production compared with the wild-type enzyme and the purified α1-A680T sGC exhibited enhanced sensitivity to nitric oxide in vitro. Conclusions-The α1-A680T sGC variant may contribute to protection against high-altitude pulmonary hypertension and supports sGC as a pharmacological target for reducing pulmonary artery pressure in humans at altitude. © 2014 American Heart Association, Inc.

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