Current status of cosmological MDM model

An analysis of cosmological models in spatially flat Friedmann Universe with cosmic gravitational wave background and zero $\Lambda$-term is presented. The number of free parameters is equal to 5, they are $\sigma_8$, $n$, $\Omega_\nu$, $\Omega_b$, and $h$. The normalization of the spectrum of density perturbations on galaxy cluster abundance ($\sigma_8 = 0.52\pm 0.04$) has been used to calculate numerically the value of the large scale CMB anisotropy ($\ell\simeq 10$) and the relative contribution of cosmological gravitational waves T/S. Increasing $\Omega_\nu$ weaken the requirements to the value of T/S, however even for $\Omega_\nu\le 0.4$ the models with $h+n\ge 1.5$ suggest considerable abundance of gravitational waves: T/S${}^>_\sim 0.3$. In models with $\Omega_\nu\le 0.4$ and scale-invariant spectrum of density perturbations ($n=1$): T/S${}^>_\sim 10(h-0.47)$. Minimization of the value T/S is possible only in the range of the red spectra ($n<1$) and small $h$ ($<0.6$). It is shown that the models with T/S$\in [0, 3]$ admit both moderate red and blue spectra of density perturbations, $n\in[0.9,1.2]$, with rather high abundance hot dark matter, $\Omega_\nu\in [0.2,0.4]$. Any condition, $n<0.9$ or $\Omega_\nu<0.2$, decreases the relative amplitude of the first acoustic peak for more than 30% in comparison with its hight in the standard CDM normalized by COBE data.Comment: 4 pages, 2 figures included; contribution to the Proceedings of Moriond 2000 "Energy Densities in the Universe", Les Arcs, France, January 22-29 200

Spectral Survey of the Star Formation Region DR21OH in the 4 mm Wavelength Range

The results of a spectral survey of the region of massive star formation DR21OH in the 4-mm wavelength range are presented. Sixty-nine molecules and their isotopologues have been detected, ranging from simple diatomic or triatomic species such as SO, SiO and CCH, to complex organic molecules such as CH$_3$OCHO or CH$_3$OCH$_3$. The obtained results qualitatively repeat the results of the survey of the same source at 3~mm. The inventories of molecules found at 3mm and 4mm overlap to a great extent. However, at 4 mm we found a number of species that have no allowed transitions in the 3-mm wavelength range, e.g. DCN, DNC, or SO$^+$. The bulk of the molecules detected at 4~mm are those that are common for dense cores, e.g., HC$_3$N or CH$_3$CCH, but some of the detected species are typical for hot cores. The latter include complex organic molecules CH$_3$OCHO, CH$_3$CH$_2$OH, CH$_3$OCH$_3$, etc. However, the detected emission of these molecules probably arises in a gas heated to 30 K only. Nine molecules, including complex species CH$_3$C$_3$N, CH$_3$CH$_2$CN, CH$_3$COCH$_3$, were found by spectral line stacking. This demonstrates the prospects of the method in the study of molecular clouds.Comment: 36 pages, 4 figure

Prospects for observing supermassive black hole binaries with the space-ground interferometer

A list of candidates for \textit{supermassive binary black holes} (SMBBHs), compiled from available data on the variability in the optical range and the shape of the emission spectrum, is analysed. An artificial neural network is constructed to estimate the radiation flux at 240~GHz. For those candidate SMBBH for which the network building procedure was feasible, the criterion of the possibility of observing the source at the \textit{Millimetron Space Observatory} (MSO) was tested. The result is presented as a table of 17 candidate SMBBHs. Confirmation (or refutation) of the duality of these objects by means of observational data which could be commited on a space-ground interferometer with parameters similar to those of the MSO will be an important milestone in the development of the theory of galaxy formation.Comment: 15 pages, 6 figures, 2 table, accepted for publication in Astronomy Report

Tourist product "one tank trip" as a factor of increasing the competitiveness of small touristic towns in Russia

The article briefly describes the issue of Russian small towns' competitive growth by including them into travel itineraries in the areas of inland and inbound tourism. An article covers the basic concepts and methods related to attractiveness growth of small touristic towns in Russian Federation by means of weekend tours intensification in the areas of inland and inbound tourism. Also the article describes the methods and the possibilities of the use of small touristic cities cultural and historical potential of for the purposes of tourism. Increase of tourist attractiveness of small touristic towns is proposed to achieve by bringing out on the tourist market of Russia the automobile weekend tour One Tank Trip. Also in an article was made an approximate calculation of innovative tourist product One Tank Trip per person when organizing a trip to the small touristic city Elabuga in the Republic of Tatarstan, described by authors. As the result, authors came to a conclusion about viability of development and promotion of tourist product One Tank Trip for the purposes of the increase of small touristic cities competitiveness

THE CONCENTRATION OF POTENTIALLY HAZARDOUS ELEMENTS AND YTTRIUM IN COAL FROM THE KARATAEVSKY MINE, IRKUTSK BASIN

It is now known that coals throughout the world contain many valuable elements. In the Irkutsk Region, coal mining is provided by the resources of the Irkutsk coal-bearing basin. The Irkutsk basin is a large area of the Jurassic continental sedimentary deposits in the south of the Siberian craton, with the Cheremkhovo, Prisayan and Kuda formations. The upper Cheremkhovo formation is the primary coal-bearing formation of the Irkutsk basin. This paper presents the geochemical data on the Karataevsky coal mine. Trace element concentrations were obtained using X-ray fluorescence spectrometry. The average Th content (14.24 ppm) in the studied coal seam is higher than that in most of the world coals. The Co (35 ppm), F (1008 ppm), Sn (12 ppm), Th (34 ppm) concentrations in the coal shale consisting primarily of kaolinite (90 %) are higher than in ordinary coals. The coals should be used considering the concentrations of potentially hazardous elements that are high relative to the world coals. The studied coals can be interesting in terms of their slight enrichment in Y, with an average concentration of 19.7 ppm, which is 2.4 times higher than that in the world coal