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Saljnikov E.,Soil Science Institute | Saljnikov A.,University of Belgrade | Rahimgalieva S.,West Kazakhstan Agrarian Technical University | Cakmak D.,Soil Science Institute | And 3 more authors.
Energy | Year: 2014

Recently the cost of soil processing for agricultural production has been rapidly increasing because of expensiveness of agricultural machinery, energy, and agricultural chemicals. Intensive soil cultivation is costly and adversely affects soil fertility due to accelerated mineralization of soil organic matter. By minimizing mechanical disturbance to the soil, costs can be reduced and the environment enhanced. About half of the global CO2 emissions from the soil come from decomposition of the annual plant litter including agricultural crops. We studied methods of soil tillage that would help stabilize the yield of crops while maintaining soil fertility and saving energy and labour at the same time. Three types of crop cultivation experiments were studied: 1) cultivation intensity (simplified ST, common CT, and intensive IT); 2) tillage depth (shallow S, and deep D subsoil till), and 3) minimum MT, and zero till ZT. The results showed that under ST the soil biological parameters were more favourable than under CT and IT. Shallow subsoil till maintained higher levels of soil nutrients, and reduced CO2 emission compared with the deep subsoil till. The minimum and zero tills positively influenced soil physical and biological properties through improvement in soil aggregate stability and soil enzymatic activity. © 2014 Elsevier Ltd. Source

Erbaev E.T.,West Kazakhstan Agrarian Technical University | Pavlenko I.M.,Saratov State Technical University | Stepanov S.F.,Saratov State Technical University
Conference Proceedings - 2014 International Conference on Actual Problems of Electron Devices Engineering, APEDE 2014 | Year: 2014

The paper substantiates the need for power electronics in wind power complexes. To obtain the maximum possible power from wind turbines at wind speeds of any proposed algorithm based on maintaining the speed of the wind wheel at the optimum value due to changes in the current. The results of mathematical modeling of wind turbine simulation program Matlab + Simulink. © 2014 IEEE. Source

Artyukhov I.I.,Chernyshevsky Saratov State University | Bochkarev D.A.,Chernyshevsky Saratov State University | Erbaev E.T.,West Kazakhstan Agrarian Technical University
Conference Proceedings - 2014 International Conference on Actual Problems of Electron Devices Engineering, APEDE 2014 | Year: 2014

The existing systems of electric power generation are most commonly based on synchronous electric machines which have to operate with a fixed shaft rotation frequency for the purpose of providing the stability of output current frequency. The development of power electronics has made it possible to create the systems of electric power generation, in which the frequency of shaft rotation may vary in order to optimize the regime of drive motor operation. The article describes the structural scheme of such a system and demonstrates the specific features of implementing its elements. © 2014 IEEE. Source

Montayeva N.S.,West Kazakhstan Agrarian Technical University | Kushaliyev K.Z.,West Kazakhstan Agrarian Technical University | Grabarevic Z.,University of Zagreb
Biology and Medicine | Year: 2016

The aim of this study is identification of risk groups, early detection, and prevention of melanoma of the skin in dogs. The pathogenetic basis of occurrence and development of melanoma is most frequently due to preexisting pigmented nevi, especially in the case of trauma. Early diagnosis of melanoma should be based on the consideration of the background conditions of the tumor and knowledge of symptoms of malignancy of melanocytic nevi. The earliest signs of malignant transformation of melanocytic nevi are the disappearance of the skin pattern on the surface of nevi; the appearance of shiny, glossy surface; the occurrence of asymmetries or irregularities of the shape of the borders of the nevus; its horizontal growth; and the appearance of subjective sensations of itching or burning sensation in the nevus. © 2016 Montayeva et al. Source

Artjukhov I.I.,Saratov State Technical University | Tulepova G.N.,West Kazakhstan Agrarian Technical University | Erbaev E.T.,West Kazakhstan Agrarian Technical University | Artjukhova E.E.,Saratov State Technical University
Conference Proceedings - 2012 International Conference on Actual Problems of Electron Devices Engineering, APEDE 2012 | Year: 2012

Is described an approach to modeling of photovoltaic panels in the combined power supply systems © 2012 IEEE. Source

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