40 research outputs found
Kedrovyi Sor : la vie quotidienne dans un camp du goulag à l'époque stalinienne
No full textKedrovyi Sor: daily life in a Gulag camp during the Stalinist period, Oleg Azarov.
Our knowledge of the Soviet concentration camp universe is beginning to be nourished by direct access to archives. The author, a young Russian scholar, has been able to work on a rich collection of documents concerning the camp of Kedrovyi Sor, in the Pečora bassin. Through his study of the camp's administrative structure, its financial operation and its economic activities, and through an analysis of the inmates and their living conditions, he provides, almost in the raw, a concrete and precise description of the daily functioning of a Stalinist camp from the early 1930s to the 1950s.Azarov Oleg, Laurent Natacha. Kedrovyi Sor : la vie quotidienne dans un camp du goulag à l'époque stalinienne. In: Vingtième Siècle, revue d'histoire, n°43, juillet-septembre 1994. Dossier : Histoire au présent de la "political correctness" pp. 69-87
The use of composite materials in load-bearing elements of an adaptive wing
No full textThe article discusses methods for manufacturing power elements of an adaptive wing from composite materials, as well as various principles for changing the configuration of an adaptive wing. A comparison is made of the aerodynamic characteristics of an adaptive wing and a wing with traditional high lift devices
Hydraulic Fracture Propagation Near the Cavity in a Poroelastic Media
No full textIn this paper, we investigate the problem of the propagation of hydraulic fractures in a poroelastic medium that has a circular cavity. The research was conducted using the extended finite element method (XFEM) implemented in the ABAQUS software package. The problem was considered in a plane formulation. The initial crack was oriented parallel to the surface of the cavity. It was shown that the path of the hydraulic fracture depends strongly on the hydrostatic stress in the medium and the distance between the crack and the cavity. We studied the influences of the poroelastic parameters, such as permeability and the Biot coefficient, on the propagation of cracks. It was shown that the cracks were less curved when the coupled problem of poroelasticity was considered. The features of fluid pressure changes inside the fracture and at the opening of the mouth were studied. It was shown that the fluid pressure in the fracture during injection was minimally sensitive to the state of the stress in the medium, to the position of the initial crack, and to the poroelastic parameters. The solution to the problem in this setting can be used to simulate hydraulic fracturing close to mine workings during a controlled roof’s collapse to prevent it from hanging, and the formation of impervious screens to reduce airflow from the mine to degassing boreholes through the rock, for example
“Smenovekhovtsy” Movement and Realities of Soviet Society of 1920-ies
No full textThe issues linked with the emergence of “smenovekhovtsy” movement among the Russian emigration in the early 1920-ies are considered. Special attention is paid to the analysis of the key position of “smenovekhovtsy” ideology about the inevitable rebirth of the Bolshevik regime in conditions of implementation of the new economic policy (NEP). The author dwells on the reasons for the formation of “smenovekhovtsy” ideas about the future of the country. It is shown that these views did not correspond to the political and socio-economic realities of Soviet society in the 1920-ies. Attention is paid to the evaluation of “smenovekhovtsy” ideology in the light of political struggle in the administration of the Bolshevik party in the period under review. The question of the moral choice of the Russian intelligentsia is raised in connection with the question of the need for cooperation with the Bolsheviks raised by “smenovekhovtsy”. A review of the correspondence of the most famous ideologist of “smenovekhovtsy” N. V. Ustryalov with his personal friend N. A. Tsurikov is made. The author proceeds from the fact that this correspondence is one of the most striking examples of the depth and dramatic split among Russian immigrants in the 1920-ies. It is concluded that the illusory and erroneous ideas about the prospects of development of Soviet society became the cause of the tragic personal fate for many of “smenovekhovtsy” who returned home from exile and became the victims of Stalinist repression of the 1930-ies
Improving the Computational Model for Approximation of Particle Functions over Diameter of Dust in the Work Area and at the Border of the Sanitary Protection Zone
No full textAbstractThis paper describes the basic ways of solving the problem of experimental data approximation. Disperse composition of crushed gypsum dust was analyzed; the analysis results are presented herein. Approximating function of particulate dust composition function is a piecewise function, defined as a three-tier spline “direct-parabola-hyperbole.” The approximation aims at finding seven function factors and two nodal points. The least square method was used to estimate the unknown parameters of regression models for the sample data. To apply this method to experimental data, a program complex calculation models for the approximation of the integral representation of the mass distribution function of particles in the dust diameter in CAS Maple was presented. It defines a function that describes the distribution of the particulate composition of the dust released from the open warehouse storage of crushed gypsum rock with the smallest error
Environmental and Working Area Dust Emission from the Gypsum Warehouse
No full textAbstractThe work analyses the emissions analysis for gypsum binder production. The major air pollutant is the suspended solids composed of a mixture of particles in air, which can be either solid or liquid and be a complex mixture of organic and inorganic substances. Studies have shown that excessive concentrations of inorganic dust (gypsum dust) generated by the open gypsum warehouse storage and thus the contribution of emission sources into total concentration of inorganic dust (dust plaster) average vary from 66,28% to 87,67%. The highest excessive concentrations of inorganic dust are registered at the border of regulated areas: up to 20% SiO2 (plaster dust) (from 5,9 to 16,0 shares of maximum allowable concentration (MAC))
Study of Urban Atmosphere Harmful Substances Adsorption into Cement
No full textAbstractThe ecological safety issues of building materials are the most important area nowadays. The impact of different substances and materials on human organism is the major point for emission control of building industry enterprises. One of the main factors can be building dust that could be presented as cement. For that purpose the qualitative and quantitative composition of samples and its adsorption capacity should be known. The article presents a comparative analysis of dust and cement. Quantitative characteristics of adsorption activity of different branded cements (CEM-I 42.5N, CEM-II/A-SH 42.5N, PC 500-D0-N) are shown. The impact of atmosphere humidity on static adsorption capacity of selected samples at specified temperature was estimated
