Temperature Dependence of Resistivity and Current-Voltage Characteristics of the Films of Composites Based on Modified Carbon Multiwalled Nanotubes and Graphite

A film composites based on modified multiwalled carbon tubes and polymer (95/5 wt. %) Respectively on paper, without the paper by directional spinning from the liquid phase and graphite. The temperature dependence of the resistivity () in the range T 77-410 K and the corresponding current-voltage charac-teristics. Detected irreversible transitions from semiconducting to metallic conductivity in carbon nono-trubkah and a maximum at T 340 K. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3516

Construction of ontology of problem area based on the syntagmatic analysis of text documents

The activities of any large organization requires the work of specialists with a large volume of unstructured information to obtain and extract the necessary knowledge to interact with partners, decision-making and so on. An array of unstructured textual information is not adapted to the structuring and semantic search. Thus, development intelligent algorithms and text analysis methods to dynamically generate the contents of a knowledge base is needed. Extract of syntagmatic structure of the text and further representation of extracted knowledge in the form of a single unified ontology allows you to access the knowledge base for solving complex problems.This paper has been approved within the framework of the federal target project “R&D for Priority Areas of the Russian Science-and-Technology Complex Development for 2014-2020”, government contract No 14.607.21.0164 on the subject “The development of architecture, methods and models to build software and hardware complex semantic analysis of semi-structured information resources on the Russian element base” (Application Code « 2016-14-579-0009-0687 »)

The applying of syntagmatic patterns for the development of question-answer systems

Основная статьяQuestion-answer (QA) systems are systems that can take questions and respond to them in a natural language. In most cases, the principles of building question-answer systems are used in the development of decision support systems. The mechanism of syntagmatic patterns is used when processing open-ended questions and when extracting answers to it from semi-structured resources. This article describes the application of the mechanisms of syntagmatic patterns in the construction of various types of QA-systems and expert systems.This paper has been approved within the framework of the federal target project “R&D for Priority Areas of the Russian Science-and-Technology Complex Development for 2014-2020”, government contract No 14.607.21.0164 on the subject “The development of architecture, methods and models to build software and hardware complex semantic analysis of semi-structured information resources on the Russian element base” (Application Code «2016-14-579-0009-0687»)

Assessment of atmospheric pollution in the city of Naberezhnye Chelny with emissions from motor vehicles and industrial enterprises

The information on existing stationary sources of atmospheric pollution, their qualitative and quantitative characteristics, factual emissions was collected and analyzed within the framework of the present study. On-site investigations of the structure and intensity of the traffic flow on the main thoroughfares of Naberezhnye Chelny were conducted. Based on the obtained data, a summary calculation of 143 pollutantswas carried out, taking into account those, included in 28 summation groups;maps of distribution of air pollution level throughout the city were drawn and analyzed for each substance, first-ever for Naberezhnye Chelny.Based on the results of calculation of pollutants dispersion, a forecast was made for the concentrations of pollutants in the residential area of the city. The substances and summation groups, for which maximum permissible concentration is likely to be exceeded (carbonic oxide, nitrogen dioxide and the summation groups, formed by these substances) were detected. Along major automobile highways and interchanges, the zones with expected values of maximum surface concentrations of more than 1 MPC were observed for carbonic oxide.To estimate the relative share of emissions from stationary and mobile sources, the calculation was carried out, without taking into account the vehicles and enterprises of the motor transport complex. It was found, that the calculated emissions of carbon oxide and nitrogen dioxide by stationary sources, in comparison with mobile sources, are not so significant and cause no more than 0.1 MPC.By the nature of spatial distribution, two distinctly different groups of pollutants were defined: mainly contained in emissions of industrial enterprises, and coming into the atmospheric air, mainly with emissions from automotive transport.Keywords: emissions fromautomotive transport, maximum permissible concentration, calculation of dispersion, maps of spatial distributio

Development of a fuzzy knowledge base based on context analysis of problem area

The article describes the process of developing a fuzzy knowledge base (KB). The content of fuzzy KB is formed as a result of the analysis of the contexts of the problem area (PrA). In this case, the context is a certain "point of view" on the PrA and its features. A graph database (DB) is used as the basis for storing the contents of the KB in the form of an applied ontology. An attempt is made to implement the mechanism of inference by the contents of a graph database. The mechanism is used to dynamically generate the screen forms of the user interface to simplify the work with the KB.This work was financially supported by the Russian Foundation for Basic Research (Grant No. 16-47- 732054)

The effective bandwidth problem revisited

The paper studies a single-server queueing system with autonomous service and $\ell$ priority classes. Arrival and departure processes are governed by marked point processes. There are $\ell$ buffers corresponding to priority classes, and upon arrival a unit of the $k$th priority class occupies a place in the $k$th buffer. Let $N^{(k)}$, $k=1,2,...,\ell$ denote the quota for the total $k$th buffer content. The values $N^{(k)}$ are assumed to be large, and queueing systems both with finite and infinite buffers are studied. In the case of a system with finite buffers, the values $N^{(k)}$ characterize buffer capacities. The paper discusses a circle of problems related to optimization of performance measures associated with overflowing the quota of buffer contents in particular buffers models. Our approach to this problem is new, and the presentation of our results is simple and clear for real applications.Comment: 29 pages, 11pt, Final version, that will be published as is in Stochastic Model

Geometric Approach to Pontryagin's Maximum Principle

Since the second half of the 20th century, Pontryagin's Maximum Principle has been widely discussed and used as a method to solve optimal control problems in medicine, robotics, finance, engineering, astronomy. Here, we focus on the proof and on the understanding of this Principle, using as much geometric ideas and geometric tools as possible. This approach provides a better and clearer understanding of the Principle and, in particular, of the role of the abnormal extremals. These extremals are interesting because they do not depend on the cost function, but only on the control system. Moreover, they were discarded as solutions until the nineties, when examples of strict abnormal optimal curves were found. In order to give a detailed exposition of the proof, the paper is mostly self\textendash{}contained, which forces us to consider different areas in mathematics such as algebra, analysis, geometry.Comment: Final version. Minors changes have been made. 56 page

Study of KS KL Coupled Decays and KL -Be Interactions with the CMD-2 Detector at VEPP-2M Collider

The integrated luminosity about 4000 inverse nanobarn of around phi meson mass ( 5 millions of phi mesons) has been collected with the CMD-2 detector at the VEPP-2M collider. A latest analysis of the KS KL coupled decays based on 30 % of available data is presented in this paper. The KS KL pairs from phi meson decays were reconstructed in the drift chamber when both kaons decayed into two charged particles. From a sample of 1423 coupled decays a selection of candidates to the CP violating KL into pi+ pi- decay was performed. CP violating decays were not identified because of the domination of events with a KL regenerating at the Be beam pipe into KS and a background from KL semileptonic decays. The regeneration cross section of 110 MeV/c KL mesons was found to be 53 +- 17 mb in agreement with theoretical expectations. The angular distribution of KS mesons after regeneration and the total cross section of KL for Be have been measured.Comment: 14 pages, 8 figure

Semigroup Closures of Finite Rank Symmetric Inverse Semigroups

We introduce the notion of semigroup with a tight ideal series and investigate their closures in semitopological semigroups, particularly inverse semigroups with continuous inversion. As a corollary we show that the symmetric inverse semigroup of finite transformations $\mathscr{I}_\lambda^n$ of the rank $\leqslant n$ is algebraically closed in the class of (semi)topological inverse semigroups with continuous inversion. We also derive related results about the nonexistence of (partial) compactifications of classes of semigroups that we consider.Comment: With the participation of the new coauthor - Jimmie Lawson - the manuscript has been substantially revised and expanded. Accordingly, we have also changed the manuscript titl