No 1 (2013)

The results of studies of actual values of coverage paint composition.

The paper says that the filtration stream parameters are definitly depended on thickness of water-penetraiting layer at the massive dam. It is founded out that the influence of the layer thickness is rather great and variable.

Change of a water and water levels mode of the rivers when passing the maximum expenses by design probability of excess.

Atacora and Donga are two departments regarded as the barns of Benin. In these two regions, the surplus of food crops harvested by farmers is stocked in earthen barns whose primary construction material is kneaded clay soil with an admixture of vegetable straws (fonio, rice…) pounded beforehand. The following research is designed to scrutinize the variation of compression strength and/or tensile strength of the used earthen material with respect to the optimum straw content, and the fluctuation of the fracture related parameters. Laboratory tests have shown that an optimum straw content of 2% provides the highest compression strength with the best mechanical performances in terms of cohesion and internal angle of friction. Tensile strength, however, continues to increase with higher straw percentages with no breakpoint indication. Moreover, the laboratory determination of the composite material’s modulus of elasticity has proven that the used soil does not have a linear elastic behavior.

The article presents information on the projects of the European scientific and technical program Eureka. The structure of the program, the authorities within the structure, subject area, and the activities of the program. We also present technological joint tender Skolkovo Fund and the Israel Industrial Research Agency MATIMOP for participation in the European scientific and technical program of Eureka.

Usage of mathematical correlations, obtained for natural and artificial watercourses, to analyse the water motion in drainage networks don’t give reliable results. The usage of complex computer programs greatly increases the cost of the entire computing system. Replacement of complex formulas with simple in the calculation of the concentration of pollutants in drainage networks can be justified, provided a thorough data validation and correction.

For design purposes, the stability of any structure being designed is of paramount importance. The fact that it is possible to perform an analysis on a space structure which shows that the stresses in that structure are all below those permissible for the materials used in its construction, is in itself no guarantee that when the structure is loaded it will not collapse. In order to determine this, it is necessary to find out if the structure is stable under the action of the applied loads. The secondary paths, especially in unstable buckling can play the most important role in collapse of the structure [2]. Analytical solutions for space trusses of the desired type which cover both nonlinear deformation and stability are difficult to find in the literature. In order to provide the desired benchmark, the complete theory and the exacl soulution for the nonlinear deformation and the stability of a regular tripod subjected to a load which acts in the direction of its axis of symmetry is presented in this work [1]. In this paper the dificulies for analysis the space structure in detecting the singular point and obtaining the real load carying capacity of these structures has been investigated and finaly a method for overcome to this problem has been presented. The numerical predictions in presented method has been verified with analytical soulotion in a space truss and and Laboratory results in a space frame.

Shallow lattice domes can be used to cover large support-free, e. g. assembly halls, sports stadium and exhibition halls. Over the last four decades the problem of buckling of shallow lattice domes has grown in importance because of several interrelated developments. The need to cover larger spans without intermediate supports with lightweight structures has made buckling behavior a determining factor in their design. For a buckling problem it is very important to define the concept concerning the loss of stability and the method to determine the collapse load. Several instability modes can occur in the behavior of the reticulated shells which must be taken into account in determining the limit bearing capacity. The secondary paths, especially in unstable buckling can play the most important role in collapse of these structures [1; 2]. The present report is an attempt to offer a synthetic view of the analysis and design problems for which the consideration of buckling is the main purpose. Another purpose of this report is to present the up-to-date bibliography on the buckling of reticulated shells. Several instability modes has been presented and the propagation of local buckling which is the most dangerous forms of instability has been discussed and many valuable theoretical and experimental studies have been carried out [3].

The state of affairs in the field of research of new surface forms used as building and machine structures in Russia and Ukraine is analyzed. It is emphasized that well-known geometricians must keep up the interest of young peoples to spatial thin-walled structures.