Relation between the X-ray and Optical Luminosities in Binary Systems with Accreting Nonmagnetic White Dwarfs

We investigate the relation between the optical (g-band) and X-ray (0.5-10 keV) luminosities of accreting nonmagnetic white dwarfs. According to the present-day counts of the populations of star systems in our Galaxy, these systems have the highest space density among the close binary systems with white dwarfs. We show that the dependence of the optical luminosity of accreting white dwarfs on their X-ray luminosity forms a fairly narrow one-parameter curve. The typical half-width of this curve does not exceed 0.2-0.3 dex in optical and X-ray luminosities, which is essentially consistent with the amplitude of the aperiodic flux variability for these objects. At X-ray luminosities Lx~1e32 erg/sec or lower, the optical g-band luminosity of the accretion flow is shown to be related to its X-ray luminosity by a factor ~2-3. At even lower X-ray luminosities (Lx~1e30 erg/sec), the contribution from the photosphere of the white dwarf begins to dominate in the optical spectrum of the binary system and its optical brightness does not drop below Mg~13-14. Using the latter fact, we show that in current and planned X-ray sky surveys, the family of accreting nonmagnetic white dwarfs can be completely identified to the distance determined by the sensitivity of an optical sky survey in this region. For the Sloan Digital Sky Survey (SDSS) with a limiting sensitivity m_g~22.5, this distance is ~400-600 pcComment: 7 pages, 3 figures, published in Astronomy Letter

Pancreatogenic infections: importance of microbiological monitoring and penetration of antimicrobial chemotherapeutic agents into the pancreas when defining therapeutic approach

The review provides the information on the spectrum of microorganisms initiating the development of clinical and morphological forms of pancreatogenic infections. It is shown that when analyzing pathological conditions, no features in the microbiological landscape of the secondary infection in the pancreas and the surrounding extraperitoneal cellular tissue are registere

Evenki of River Basin Olyokma: Resettlement and Land Use in the XXI Century

The relevance of the study is due to the need to study the characteristics of the resettlement of the local Evenki group of the Olekma River Basin, which influenced the modern land use and economic and cultural relations of Evenki living now in the Olekminsky District of the Republic of Sakha (Yakutia), the Kalarsky and Tungiro-Olekminsky Districts of the Trans-Baikal Territory and the Tyndinsky District of Amur region. The article focuses on the study of the Evenki population dynamics based on a comparative analysis of the materials of the censuses of the 20th century. For comparison, current data on the number of Evenks in their areas of residence according to the 2010 census are given. An analysis of archival sources showed that changes in the resettlement of Evenk clans occurred simultaneously with changes in the administrative-territorial division. Factographic materials found in the National Archives of the Republic of Sakha (Yakutia) confirm that when deciding on the administrative-territorial structure, the opinions and proposals of the local population were taken into account. Author’s maps were compiled, which allowed a spatial analysis of the distribution of the population and the forms of organization of the Evenki economy. It was found out that each region has its own specific land use determined by administrative decisions and regional policies

Acute ethanol poisoning and its complex damaging effect on functionality of the liver

It is established, that ethanol in the dose of 12 g/kg at experimental animals (white noninbred male rats) has the pronounced damaging effect on the liver, which is manifested in the dynamics of the aggregate biochemical, histological and histochemical indicators

Sociolinguistic Conditionality of Yakut Language Functioning in Field of School Education: Origins of Incipient Crisis

The results of a sociolinguistic analysis of factors that reduce the language competence of Sakha schoolchildren in a broad extralinguistic context based on field data representing the quantitative and qualitative characteristics of the research object is presented in the article. Attention is paid to the functioning of the Yakut language in the field of education, which is undergoing various transformations depending on the course of the state educational policy, the socio-economic state of the region and the processes of globalization, the consequences of which form risks for the ethnocultural component of communities in the constituent entities of the Russian Federation with non-dominant languages. It is argued that the language policy in the field of education, which implements “de jure” bilingual, polylingual models, in the implementation of which the formal approach prevails, actually minimizes the presence of the Yakut language in the education system due to insufficient consideration of linguistic attitudes and the real needs of the Sakha ethnic community. It is noted that the conditions of active contact bilingualism in the regions of the Russian Federation, a variety of ambiguous extralinguistic factors predetermine the strengthening of institutional support, state protectionism in the field of optimal linguistic support of training and educational processes. It is proved that taking into account the experience of research on family, civil language policy can help in obtaining an optimal solution to the problems of language reproduction on regional material

Study of the Fast X-Ray Transient XTE J1901+014 Based on INTEGRAL, RXTE and ROSAT Data

The source XTE J1901+014 discovered by the RXTE observatory during an intense outburst of hard radiation and classified as a fast X-ray transient is studied. The source's spectral characteristics in the quiescent state have been investigated for the first time both in the soft X-ray energy range (0.6-20 keV) based on ROSAT and RXTE data and in the hard energy range (>20 keV) based on INTEGRAL data. A timing analysis of the source's properties has revealed weak nonperiodic bursts of activity on time scales of several tens of seconds and two intense ($\sim$0.5-1 Crab) outbursts more than several hundred seconds in duration. Certain assumptions about the nature of the object under study are made.Comment: 19 pages, 7 figure

Economic concept of food development of Russian market

At present, the Russian economy is developing in the conditions of imposed sanctions on high-tech means of production by foreign countries. In this situation, the development vector is the formation of import substitution policies and the solution of food safety issues for various types of food products that are strategically important for human life. Meeting the needs of the country's population with its own production is a priority for the development of the agrarian market, which makes it possible to develop the production agrarian sector, the processing and trade sphere, to create additional jobs, thereby improving the quality and standard of living of people.peer-reviewe

Correction of dyscrasia of the organism of rats in the conditions of acute ethanol poisoning by the introduction of chelate zinc compound. Morphofunctional characteristics of protective action of the 2,8,9-trihydrozincatrane

It is experimentally proved that the new zinc chelate compound 2,8,9-trihydrozinkatrane has a protective effect on the organism of experimental animals contributing to the improvement of essential metabolic processes. Single intragastric introduction of 2,8,9-trihydrozincatrane in protective dose of 4 mg/kg is an effective method of limitation of development of acute alcoholic poisoning in experimental rats that promotes an increase of tolerance of animals' organisms to multiple negative effects of ethanol and its metabolites

Determination of composition and fluidity of an alloy for impregnating hard alloys on the basis of titanium carbide

In this paper optimum compositions of a metal bond of Cr – Ni - Co system are determined by mathematical planning methods. As a response function, value of bending strength at a temperature of 800 °C was used. On the basis of the developed planning matrix samples of required composition were made, bending strength and long-term strength are measured. A certain composition of alloy-bond and its quantity is found. Spiral tests were conducted to determine fluidity

Studying laser radiation effect on steel structure and properties

There was studied the effect of laser radiation on the structure and properties of annealed and tempered steel with different content of carbon. For surface hardening there was used a laser complex equipped with Nd: YAG pulse laser with power density up to 30 kW/сm2. As a result of the carried-out studies there were calculated characteristics of laser, steel microstructure and properties