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The article is based on the materials of the Current Archive of the Territorial Body of the Federal State Statistics Service in the Omsk region (Omskstat) including the archival materials from the fonds of Statistical directorate of the Omsk region (F.2122.) in the Historical Archive of the Omsk Region (HAOR). The paper comprehensively examines the population of the Omsk region in the 1950s-1970s. The author studies demographic development and traces demographic transition during the period from Stalinism to the “Thaw” and stagnation based on the archival records and materials which used to be «For office use only». Materials of the current statistics and population censuses of 1959 and 1970 are analyzed. The paper focuses on the natural movement of population which was the determining factor behind the evolutionary development of the region. The author reconstructs the times-series of the main demographic indicators: birth rate, mortality (including infantile), natural and mechanical movements, sex and age structures of the population. Trends and problems related to the birth and mortality rates, are studied. The author introduces a whole body of data on demographic development of the Omsk region previously unused by the scholars due to the censorial restrictions of the Soviet period. Materials of the current statistics of the period under study (1950 - 1970) there was a constant outflow of population from the Omsk region which was interrupted by the net migration gain in the years of development of virgin soils and intensive resettlements in the region.

Phenomena inherent in degenerate branched and completely branched chain reactions are considered from a unified viewpoint. In the case of degenerate branched chain reactions, such phenomena include a negative temperature coefficient, cool flames, and oscillations arising in slow combustion of hydrocarbons. Another phenomenon (intermittent flames) is inherent only in completely branched chain reaction of low-temperature combustion of hydrogen at reduced pressures in the presence of SO₂ additives. These kinetic manifestations of chain branching processes are characterized by a variety of elementary reactions with participation of intermediate compounds and free radicals with different structures. A specific kinetic feature of reactions of both types is simultaneous participation of the active center responsible for chain branching in the branched reaction and in the reaction of propagation of an ordinary chain.

Normal burning velocities in methanol-air mixtures and in the same mixtures with added 4.5 and 7.2% hydrogen as a second fuel were measured over a wide range of equivalence ratio and for initial conditions of 0.16 MPa and 354 K. It has been shown that the mechanism previously proposed for the combustion of mixtures of CO, CH₂O and CH₃OH with air is applicable to multicomponent mixtures containing hydrogen and methanol.

Molecular beam mass spectrometry was used to measure mole fraction profiles of the reactants, major reaction products and intermediates, including precursors of polycyclic aromatic hydrocarbons, in a premixed fuel-rich (equivalence ratio of 1.75) n -heptane/toluene/O2/Ar flame stabilized on a flat burner at atmospheric pressure. The ratio of the liquid volumes in the n -heptane/toluene mixture was7:3. The chemical structure of the flame was modeled using a detailed mechanism of chemical reactions tested against experimental data of other authors on n -heptane/toluene flames and comprising the reactions of formation of polycyclic aromatic hydrocarbons. The mechanism was extended with cross-reactions involving derivatives of n -heptane and toluene. Overall, the new experimental data are in satisfactory agreement with the numerical simulation results; however, there are differences between the measured and calculated mole fraction profiles of some species. Analysis shows that in the n -heptane/toluene flame, the main reactions leading to the formation of low-aromatic compounds (benzene and phenyl) are reactions typical of the pure toluene flame.

The article gives analytical and experimental data on separation of sulfide minerals in bulk concentrates of complex ores. The separation methods for minerals having similar process properties are selected. It is found which factors influence mineral separation efficiency in concentrates of rebellious and complex ore processing. The authors present fresh data on activating effect exerted by cations of copper on floatability of sphalerite, galena, pyrite and pyrrhotine species, as well as on activating effect of copper minerals. It has been studied how species of pyrite and nonferrous metal sulfides influence oxidation, floatability and depression. The selected methods to separate complex ore concentrates provide for multi-stage flotation circuit, with recovery of rebellious species into rough concentrates and products and their separation in different cycles later on. A system mode has been developed and recommended for dosing selective collectors, depressors and modifiers to achieve the best flotation performance.

The article describes theoretical and experimental data on dearsenation of gold-containing scorodite ore in water vapor. It is shown that roasting of scorodite with pyrite in super-heated vapor enables complete removal of arsenic and sulfur in the form of sulfides of the original material and exposes noble metals.

The author performs the comparative analysis of the international standards on determination of elastic properties of rocks from uniaxial compression tests, with benefits and shortcomings of the standards presented. The measurement data on lateral and transverse strains obtained in rocks and model metal samples under compression using different type extensometers are reported. The scope of the analysis embraces applicability of extensometers to the determination of elasticity modulus and Poisson’s ratio in rocks under variation in temperature. Examples of estimating elastic properties in thawed and frozen rocks are given in terms of enclosing rocks at Botuobinskaya diamond pipe.

The designed automated system for pitwall deformation monitoring consists of an independent data recorder, strain sensors, AD converters, and front-end and back-end controls. Data are accumulated in server in on-line mode via cellular modem. The self-contained tools are supplied from accumulators recharged by solar batteries, which expands operational life of the system. The system has been trailed in an open pit mine at Nyurbinskaya kimberlite pipe in deformation monitoring of faults in the eastern pitwall and estimation of its geomechanical stability.

The authors prove relevance of digital space data to be used for regional and local operational quantitative estimation of nature in the area of mining and processing. The research findings are analyzed in terms of environmental appraisal for the area of an open pit mine at Gusevogorskoe deposit of titano-magnetite ore with vanadium admixture (Sverdlovsk Region, Russia).

The article gives new information on integrated assessment of the environmental impact of mining in the south of Russia’s Far East. The assessment is based on: Earth remote sensing data; normalized difference vegetation index for nature-technology systems; combination of the calculated vegetation index and digital relief model to implement individual estimation of the induced impact and natural effects; joint analysis of the induced impact based on satellite monitoring and field survey data; computation of ecological-and-economic damage.