№ 130(6), June, 2017
Public date: 30.06.2017
Archive of journal: Articles count 87, 224 kb
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01.00.00 Physical-mathematical sciences
SIMULATION OF BALL LIGHTNING IN CONDUCTING ENVIRONMENT
01.00.00 Physical-mathematical sciences
Description
In this work, a model is developed to describe the formation of streamers, plasmoid, and ball lightning in a conducting medium. To describe the contribution of the conductivity currents, we modified the standard electrostatic equation taking into account the vortex component of the electric field. As a result of this generalization, a system of parabolic-type nonlinear equations is formulated that describes the formation of streamers, plasma long-lived formations and ball lightning. As is known, in laboratories it is possible to create a plasmoid with a lifetime of 300-500 ms and a diameter of 10-20 cm, which is interpreted as a ball lightning. With high-speed photography, a complex structure is detected, consisting of a plasmoid and surrounding streamers. Within the framework of the proposed model, problems are posed about the formation of a plasmoid and the propagation of streamers in an external electric field. In this model, the plasmoid is considered to be a long-lived streamer. The range of parameters in which a plasmoid of spherical shape is formed is indicated. It is established that there are three streamer branching mechanisms. The first mechanism is related to the instability of the front, which leads to the separation of the head of the streamer into two parts. The second mechanism is associated with the instability of the streamer in the base region, which leads to the branching of the streamer with the formation of a large number of lateral streamers closing the main channel of the streamer to the cathode. In numerical experiments, the third branching mechanism observed in experiments connected with the branching of the plasmoid in the cathode region with the closure of the space charge to the anode through the streamer system was observed. The results of modeling the evolution of globular clusters in a scale of hundreds of milliseconds are given. Plasma exchange recharge modes leading to the formation of a positive or negative charge of the system are found
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SPECIAL CASES OF INVERSE MATRICES
01.00.00 Physical-mathematical sciences
Description
The inverse matrix for the square matrix A of order n with coefficients of some field exists, as it is known then and only then, when its determinant is not equal to zero. If the matrix A has a certain type (certain structure), then an inverse matrix A-1 should not have exactly the same structure. Therefore, it is interesting to describe such square matrices A, which have an inverse matrix A-1, having the same structure as the matrix A, under certain conditions. For example, a subdiagonal matrix with nonzero elements on the main diagonal has an inverse matrix over a field of characteristic zero, having also the form of subdiagonal matrix. Similarly, an inverse matrix towards symmetrical or skew-symmetric matrix is also symmetric or skew-symmetric accordingly. Also, the matrix inverse to non-degenerate (nonsingular) circulant will be a circulant itself, and finally, the matrix inverse to nonsingular quasdiagonal matrix D will be quasdiagonal itself, and will have the same partitioned structure as D. Thus, there is a problem of determining these types of nonsingular matrices that have an inverse matrix of the same type as a given matrix. In line with this problem in the present study it is determined such type of matrices for which an inverse matrix has the same type, at that the conditions are identified in explicit form, ensuring the nonsingularity of the matrix. The matrices of three orders are shown in detail. These results allow determining the characteristics of fields over which there are inverse matrices of the considered types
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Description
The аrticle is devoted to study of adsorption of enzymes, antioxidants contained in horseradish root on starch to create enterosorbent with anti-oxidant properties. For this goal we have studied adsorption isotherm calculated constants, thermodynamic parameters (change of enthalpy, entropy, and isobaric-isothermal potential); sorption kinetics of enzyme-antioxidants on starch and calculate the main characteristics. The method of producing of enterosorbent - antioxidant on based starches has been developed based on the experimental data. The ready sorbent is a white powder having no taste and smell. In biological fluids and water, it is insoluble. The enterosorbent on starch does not dissolve in water and biological fluids. It is the solid component. This enterosorbent can be used to protect the gastrointestinal tract of humans and animals against a wide variety of oxidants and peroxide. The results of this work will form the basis for the study of the antioxidant properties of the resulting enterosorbent. The results showed that during the tests, the enterosorbent on the starch showed good antioxidant properties. It has high antioxidant activity with respect to hydrogen peroxide
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Description
The article presents the data on vitality and age structure of Beckmannia syzigachne and Calamagrostis langsdorffii соеnopopulations under conditions of the Lena-Viluy interfluve. The study revealed 3 types of vitality of Beckmannia syzigachne (prosperous, equilibrium, and depressive), 2 types of vitality of Calamagrostis langsdorffii (prosperous and depressive). The age spectrum in both species is normal, non-complete, left-sided. According to the delta-omega classification, the coenopopulations are considered to be young
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INVESTIGATION OF TRACE ELEMENT COMPOSITION OF RAW STEVIA REBAUDIANA BERTONI MATERIALS
Description
The article gives an analysis of the elemental composition in raw materials of stevia. Stevia plant is able to regulate the flow of heavy metals, allowing them, on the one hand, actively oppose the excessive intake of toxic elements and on the other hand, selectively cumulate essential elements. The contents of essential elements in plant raw materials do not exceed the acceptable standards regardless of the growing conditions
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Description
The author describes the dynamics of commercial catches and the forecasts of pikeperch catch in 2010- 2016 with an analysis of the causes that affect the state of stocks. The analysis of the effectiveness of the recommended pikeperch catch has been made taking into account the factors that affected the fishery. Researches were carried out to study the population structure, seasonal distribution, migrations and other characteristics of the pikeperch populations in the Azov limans. The obtained data made it possible to assess the state of the pikeperch stocks and give recommendations on their rational use. Based on the results of ichthyological studies, the pikeperch age, length and weight composition have been determined and its biological state has been studied. The preliminary forecast of the stocks and the recommended pikeperch catch in the Azov limans for 2018 is given. The forecast of the recommended pikeperch catch in the Azov limans for 2018 is based on the analysis of the stocks of commercial fish species for a number of years of observations, taking into account the total mortality rate under the influence of the fishery load (commercial mortality coefficient) and the amount of replenishment of commercial population with fish mature for the first time
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Description
The article gives the results of the study of an effect of mechanochemical powder of wood green of Abies (MPA) on potato morphogenesis in vitro. The study involved the hormone-free nutrient mediums (MS, ½ B5, ½ LS) for growing microcuttings from preliminary obtained aseptic plants. Plant morphogenesis was observed on the 15th and 30th days. At that, the number of developed shoots, plant height, leaves number, rhizogenesis rates, root number and length were estimated. MPA appeared to have the regulatory effect on morphogenesis of potato microcuttings. Based on mineral composition of the nutrient agar medium for potato microcuttings growing, MPA at 100 mg/l concentration induced root development (½ B5 medium), reduced height of shoots (MS medium), while the number of leaf blades was not affected
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COENOPOPULATION STATE OF SOME FABACEAE SPECIES UNDER CONDITIONS OF THE MIDDLE LENA RIVER VALLEY
Description
The study concerns the results of the study of coenopopulations of the following Fabaceae species: Medicago falcata, Oxytropis candicans, and Onobrychis arenaria under conditions of the Middle Lena River. The study was conducted in Yakutsk vicinities, 13 km north-east of the city. It is stated that all the studied coenopopulations are normal. Rather small values of substitution and recovery indices evidence certain problems in self-maintaining processes. The age structure analysis using two age indices, “delta” and “omega”, allows to classify the coenopopulations of Medicago falcata, Oxytropis candicans and Onobrychis arenaria in phytocoenoses of the Lena River valley as normal young populations. They were prevailed by juvenile, immature, virginile, and young reproductive plants
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Description
We have presented information about species diversity of the coastal zoobenthos in some of Karasun lakes, Krasnodar. We have shown methodology information and reported the research area. We have made a taxonomic analysis. The biomass and the quantity of the main zoobenthos groups were calculated. Based on the two main fodder objects - Olygochaeta and Chironomidae and the P/B coefficient, there was calculated zoobenthos production of the studied lakes. The potential fish capacity was defined
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Description
There are three main growth points of modern information technologies: global network and mobile communication, advanced human-machine interfaces, intelligent technologies. As it is known, the system (synergistic) effect is usually observed in multidisciplinary and interdisciplinary researches. This means that an interesting direction of research and development is located at the overlap of these three promising areas, namely: advanced interfaces in the global mobile networks, advanced intelligent interfaces and the application of artificial intelligence technologies in the Internet and mobile communications. In addition, a particularly high relevance goes to the development and application prospective of intelligent interfaces to the Internet and mobile communications. The Internet intellectualities gradually, it turns from non-local storage of large data (big data) in information space that contains meaningful big data, i.e. "great information" (great info), and then in the space of knowledge or "cognitive space" in which most information is actively used to achieve goals (management) and turns into the "great knowledge" (great knowledge). There are more sites devoted to artificial intelligence, free databases for machine learning (UCI, Kaggle, and others) and even on-line intelligent applications, and interfaces used in the Internet are improving. Recently, there was an acquisition of company Oculus, which is the world's leading developer and manufacturer of ammunition of virtual reality by the developer of one of the first global social networking Facebook - Mark Zuckerberg. However, students and scientists still do not notice that open, scalable, interactive, intelligent on-line environment for learning and researches already exists and operates, based on automated system-cognitive analysis (ASC-analysis) and its programmatic Toolkit – intellectual "Eidos" and the author's website. This article is an original presentation and it is designed to familiarize potential users with the capabilities of this environment
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