Investigation of pollution of the soil cover of objects of Sumgait area of the Absheron peninsula with heavy metals

In a paper, the investigations of pollution of the soil cover of objects of Sumgait region of the Absheron peninsula with heavy metals have been carried out. The microelements composition of the grey-brown soils of Sumgait region taken from the territory of superphosphate plant has been studied. According to the content of microelements, the investigated soils in the North–Western and southern parts of the Absheron Peninsula have been grouped on a degree of concentration of heavy metals depending on the depth of the investigated soils. The zinc (77.0 mg/kg, at depth 0–16 cm, soil profile no. 03), copper and cadmium (88 mg/kg and 0,36 mg/kg at depth 0-20 cm, soil profile no. 05) have the highest concentration in comparison with other microelements. Depending on the location of the key areas from sources of technogenic emissions, the content of heavy metals is changed. Thus, it has been revealed that in the soils investigated by us on the territory of the superphosphate plant the most important micro elements, i.e. heavy metals have been unevenly distributed

Roughness coefficient of the Instruch riverbed

The article presents the results of improving the numerical method developed in [1-3] for calculating the roughness coefficient of the riverbed (RCOTR) to increase stability and using it to study the dependence of the RCOTR of the Instruch River on dimensionless complexes in different seasons

ADAPTIVE AGRO-TECHNOLOGY OF FARMING NEW WINTER WHEAT VARIETY IN THE TERSKO-SULAK TERRITORY

Aim. The aim of the research was to improve the elements of agro-technology for cultivating new high-yielding varieties of winter wheat under conditions of the plain zone irrigation depending on the doses and the terms of introducing mineral nitrogen-phosphorus fertilizers.Methods. Research was carried out on chestnut heavy loamy soils. Sampling of soils and plants, as well as agrochemical properties of soils were determined according to standard generally accepted methods. Mathematical processing of data on the yield of cereals was carried out by analysis-of-variance method using computer technology.Results. Our studies showed that the most productive of the studied varieties was Grom, which, on average for three years (2012-2015) gave a grain yield of 7.6 t/ha with nitrogen-phosphorus fertilizers introduced at a dose of N180P100 against 5.6 t/ha in a similar version to the control during sowing of the Tanya variety. Vassa and Sila varieties were also inferior to Grom variety for yields, respectively, by 1.1 t/ha and 1.4 t / ha. It was also revealed that with the Grom variety, when applying an increased dose of mineral fertilizers (N180P100), on average for three years, the best indicators were by the area of the leaf surface (63.6 thousand m2/ha), photosynthetic index of crops was 2765.6 thousand m2/ha and net productivity of photosynthesis was 6.3 g/m2, day. For other varieties of winter wheat and doses of mineral fertilizers, these indicators were lower.Conclusion. In steady-state experiment, when studying the potential of new high-yielding varieties of winter wheat at different levels and times of introducing mineral nutrition, the Grom variety showed the best yields

Selecting and structuring teaching content algorithm for physical and mathematical disciplines, aimed at students’ project-technical competence formation

© 2015, Review of European Studies. All right reserved. The most important component of the professional competence of an engineer is the synthesis of project and technical competences—project-technical competence, suggesting a set of special knowledge, skills and proficiencies, personal qualities necessary for the effective specialists’ performance of their professional duties, in particular, for the successful implementation of engineering projects requiring technical calculations running, capabilities to effectively operate in real life, to get oriented in production situations, to adapt to changing conditions, to work in different teams. In this connection, the problem of selecting and structuring teaching content of physical and mathematical disciplines, aimed at the formation of project-technical competence of technical university students, is becoming relevant. The paper presents an algorithm for selecting and structuring the physical and mathematical disciplines teaching content, aimed at the formation of students’ project-technical competence, involving a sequence of analytical and preparatory, organizational-substantive, procedural-methodological, as well as correction-implemental stages. The article submissions are of practical value to Mathematics and Physics teachers for selecting and structuring the content of these disciplines

How often does the Unruh-DeWitt detector click? Regularisation by a spatial profile

We analyse within first-order perturbation theory the instantaneous transition rate of an accelerated Unruh-DeWitt particle detector whose coupling to a massless scalar field on four-dimensional Minkowski space is regularised by a spatial profile. For the Lorentzian profile introduced by Schlicht, the zero size limit is computed explicitly and expressed as a manifestly finite integral formula that no longer involves regulators or limits. The same transition rate is obtained for an arbitrary profile of compact support under a modified definition of spatial smearing. Consequences for the asymptotic behaviour of the transition rate are discussed. A number of stationary and nonstationary trajectories are analysed, recovering in particular the Planckian spectrum for uniform acceleration.Comment: 30 pages, 1 figure. v3: Added references and minor clarification

Observer Dependent Horizon Temperatures: a Coordinate-Free Formulation of Hawking Radiation as Tunneling

We reformulate the Hamilton-Jacobi tunneling method for calculating Hawking radiation in static, spherically-symmetric spacetimes by explicitly incorporating a preferred family of frames. These frames correspond to a family of observers tied to a locally static timelike Killing vector of the spacetime. This formulation separates the role of the coordinates from the choice of vacuum and thus provides a coordinate-independent formulation of the tunneling method. In addition, it clarifies the nature of certain constants and their relation to these preferred observers in the calculation of horizon temperatures. We first use this formalism to obtain the expected temperature for a static observer at finite radius in the Schwarzschild spacetime. We then apply this formalism to the Schwarzschild-de Sitter spacetime, where there is no static observer with 4-velocity equal to the static timelike Killing vector. It is shown that a preferred static observer, one whose trajectory is geodesic, measures the lowest temperature from each horizon. Furthermore, this observer measures horizon temperatures corresponding to the well-known Bousso-Hawking normalization.Comment: 11 pages, 1 2-part figure, references added, appendix added, discussion streamline

Гибридные системы распределенной генерации с возобновляемыми источниками: моделирование и анализ их режимов работы в энергосистеме

The paper considers problems pertaining to modeling and simulation of operational hybrid system modes of the distributed generation comprising conventional sources – modular diesel generators, gas-turbine power units; and renewable sources – wind and solar power plants. Operational modes of the hybrid system have been investigated under conditions of electrical connection with electric power system and in case of its isolated operation. As a consequenceРассматриваются вопросы моделирования и имитации режимов работы гибридной системы распределенной генерации в составе традиционных источников (модульные дизель-генераторы, газотурбинные агрегаты) и возобновляемых источников (ветровые и солнечные энергоустановки). Проведены исследования режимов работы гибридной системы при наличии электрической связи с энергосистемой и при ее изолированной работе. Имитируются динамические процессы на модульных дизельных агрегатах и ветроустановках как следствие возмущений в энергосистеме. Приводятся результаты анализа этих процессов при разных выработках мощности от ветровых и солнечных источников

Black Hole Evaporation in a Noncommutative Charged Vaidya Model

The aim of this paper is to study the black hole evaporation and Hawking radiation for a noncommutative charged Vaidya black hole. For this purpose, we determine spherically symmetric charged Vaidya model and then formulate a noncommutative Reissner-Nordstr$\ddot{o}$m-like solution of this model which leads to an exact $(t-r)$ dependent metric. The behavior of temporal component of this metric and the corresponding Hawking temperature is investigated. The results are shown in the form of graphs. Further, we examine the tunneling process of the charged massive particles through the quantum horizon. It is found that the tunneling amplitude is modified due to noncommutativity. Also, it turns out that black hole evaporates completely in the limits of large time and horizon radius. The effect of charge is to reduce the temperature from maximum value to zero. It is mentioned here that the final stage of black hole evaporation turns out to be a naked singularity.Comment: 25 pages, 36 figures, accepted for publication in J. Exp. Theor. Phy

Back reaction, covariant anomaly and effective action

In the presence of back reaction, we first produce the one-loop corrections for the event horizon and Hawking temperature of the Reissner-Nordstr\"om black hole. Then, based on the covariant anomaly cancelation method and the effective action technique, the modified expressions for the fluxes of gauge current and energy momentum tensor, due to the effect of back reaction, are obtained. The results are consistent with the Hawking fluxes of a (1+1)-dimensional blackbody at the temperature with quantum corrections, thus confirming the robustness of the covariant anomaly cancelation method and the effective action technique for black holes with back reaction.Comment: 17 page