Experimental Study of the Effect of Turbulence on the Solid Phase of Suspension

Results of laboratory experimental studies of the effect of turbulence on the vertical velocity of solid particles in water suspension are presented. The rate of particles settling has been found to decelerate significantly. These particles consume a part of turbulent energy, its amount largely depending on the size of particles themselves and the intensity of turbulence.     

Evidence for enhanced star formation in iras-detected markarian galaxies

The IR emission of 640 Markarian galaxies (MrkG), included in the IRAS Survey, is considered as an evidence for enhanced star formation rate (SFR) in these objects. About 73% of the MrkG have high far-infrared luminosities (ca. 10E + 44 erg s^–1) in 1–500 mcm IR spectral band. The distribution of log(f ₆₀/f ₁₀₀), peaked at about 45 K, shows that IRAS MrkGs have a tendency to extend the relationf ₆₀/f ₁₀₀ vsL _ir/L _bifor normal S glaxies. They emit up to hundred times more IR energy in 40–120 mcm band than in optics. The mean ratio log L _ir/L _b for 621 IRAS MrkG with known redshifts is 2.2.It is suggested that there are two IR emitting components in the IRAS MrkG - a warm one connected with the UV-fluxes of the newborn massive stars, re-radiated by dust, and a cool one, originated from the dust in galactic disks and heated by the general interstellar radiation field. The warm IR luminosities and warm IR fractions are determined on the basis of IR colour-colour diagrams(25/12),(60/25), and(100/60). The mean warm IR fraction for all Mrk IRAS detected galaxies with well-defined IR fluxes is 0.83 when the grain mass absorption coefficient model withn = 0.0 is used. The dust mass responsible for the IR flux at 60 mcm is derived to be about 10E + 5M , assuming the dust clouds are optically thin, and using the dust temperatureT _d 46 K (deduced from thef(60)/f(100) ratio). There is a relation betweenL _irandL _blwhich points out that the most IRAS MrkG have rather enhanced SFR.     

New approaches to the study of population dynamics in cities of Moscow Oblast

New approaches to the study of population growth, spatial distribution, and urbanization in the USSR are presented. "Quantitative analysis of historical trends in city growth rates within Moscow Oblast (1926-1984) reveals two major components or city types: a group of cities with below-(oblast) average rates for each of five periods of analysis (1926-39, 1939-59, 1959-70, 1970-79, 1979-84) and a second category experiencing above-average growth until 1970, with subsequent reduction of rates below the oblast average."     

Settlement in large cities of the USSR: an analysis of effectiveness (a review article)

"The issue of the effectiveness of large cities as forms of settlement remains a lively topic of debate in the USSR. Categorizing the issue into three aspects--economic, ecological and social--this paper reviews the arguments pro and con. Although the author makes a conscientious effort to reflect all points of view, a tone favoring the development of big cities appears evident in the discussion."     

On the problem of air dryness estimation

A new dimensionless parameter is proposed enabling to estimate the aridity of physiographic territories for any spatial and temporal scales. The potential of the use of this parameter is demonstrated by the example of the territory of Uzbekistan.     

Stability of the parameters of the Stellar black-hole mass distribution estimated using nonparametric methods

Individual probability-density distributions for the masses of compact objects in 20 X-ray binary systems have been constructed. The mass distributions were modeled using Monte-Carlo simulations. The closeness of the components in systems with massive optical stars was taken into account using K corrections. The parameters of the resulting black-hole mass distributions were obtained using nonparametric statistical methods. The presence of a statistically significant mass gap in the range 3–5M _⊙ is confirmed. The currently observed probability-density distributions of the compact-object masses are stable against small amounts of data contamination.