No 4 (2014)

One part of water quality, total suspended solids (TSS), is a reliable indicator of other pollutants, particularly nutrients and metals that carried on the surfaces of sediment in suspension. In practice, there are various models are used for modeling and prediction TSS entering reservoirs; model from: a relationship between water discharge and TSS, to a use complex statistical models. In this study, the performances of linear time series models for forecasting TSS entering Dez dam reservoir, were investigated. Many studies in recent years show that this type of model is an appropriate approach to predict TSS (Huixin. C, Dyk. P. 1996, 1998, Owens S. A etd. 2013). A random study conducted from Jan 2002 to July 2003 in Dez dam reservoir. STATGRAPHICS Plus software, are used for modeling and analyzing data to determine the best possible linear time series models. Results indicate that the simple exponential smoothing model, is the most efficient novel approach with an acceptable range of error, can be used successfully for forecasting TSS entering Dez dam reservoir.

Conducted a comprehensive study of the adsorption of dimethylformamide aqueous solutions of active coal. Identifies the main adsorption parameters necessary for engineering calculations of the adsorption columns.

In many concrete and reinforced concrete elements of load-bearing structures, exposed to the frequently changing loads, accumulated fatigue damage of the material, leading to destruction. Petroleum products which impregnate concrete and reinforced concrete structures have a negative influence on their physical and mechanical properties and contribute to the formation of damages. Wherein said negative effect is largely depend on the viscosity of petroleum products. Currently available guidelines for assessing endurance of concrete and reinforced concrete elements do not fully take into account the effect of viscosity of petroleum products on their physical and mechanical characteristics. This restrains the solution of the tasks to ensure the maintenance safety conditions of industrial buildings in technological processes that use petroleum products. Based on the analysis of the test results on the endurance of concrete and reinforced concrete elements obtained an empirical formula to estimate the accumulation of fatigue depending on the number of loading cycles and the conditional viscosity impregnating of petroleum products. Represented mathematical description of the endurance assesment allows to determine the index of safety and available resources of concrete and reinforced concrete elements of load-bearing structures under the influence of various petroleum products.

CEB is the only common structure for Benin and Togo, which provides electricity to these two countries. The optimization of its power transmission network is very important. Thus, the synchronization of its major sub-networks, namely Volta River Authority (VRA) and Transmission Company of Nigeria (TCN), aim not only to facilitate the network operation, but also to optimize and to reduce the inconvenience for people in Togo and Benin. This synchronization depends on the electrical parameters of the TCN and VRA networks. We studied the feasibility of this synchronization by providing a High Voltage Direct Current (HVDC) system that we have simulated in Matlab / SimPowerSystems software.

There presented the system of disconnection of diesel’s cylinders or cycles, invented in Peoples’ Friendship University of Russia. The system may be employed for diesel regulation by variation of working volume, displacement.

The laboratory experiments of the deformations of the underwater barriers at step of the extreme waves were conducted. Some relations connecting the volume of deformation of underwater obstacles with the wave parameters and flow dynamics parameters are obtained.

The paper describes the dependence of errors occurring in the frames of two-layer metal domes as a result of inaccuracy of actual geometric dimensions of assembly elements. The effect of errors on bolted connections of the individual members in the joints of the frame is demonstrated. The evaluation of the influence of errors on assemblage process and associated adjustment operations is given. Sequence of operations for different methods of assembly of the frameworks of metal domes are described. The results of statistical investigations of the probable clearances in the joints are presented.

Organizational and technological solutions for the construction in record time of single-storey buildings of various purposes are given in the article. Solutions include: the production of building's structural elements in the factory, the main ones are the “sandwich” panels, the use of pin-joints between structures for accelerate delivery in packaged form and the installation of the building in the design position? the use of pile foundations of shallow emplacement.

Analyzed thermobaric conditions in hydrate reservoirs in the development of oil and gas fields in Western and Eastern Siberia at different salinity formation water.

Special characteristics of original precipitates which influenced on lithologic properties of Okhino-Khubsugul phosphorites are shown. Their cyclic phosphatization is fixed.