Vol 7, No 2 (2020)

The article describes the developed radiometer for Express measurement of alpha radiation of radioactive elements based on a large-diameter silicon detector. The main element of the PPD detector is made using computer mathematical modeling of all stages of the technological process of manufacturing detectors, taking into account at each stage the degree of influence of the properties of the initial silicon on the electrophysical and radiometric characteristics of the detector. Detectors are manufactured for certain types of devices. The developed radiometer is designed to measure alpha radiation of natural isotopes (238U, 234U, 232Th, 226Ra, 222Rn, 218Po, 214Bi, etc.) in various environments. It also shows the principle of operation of the device, provides a block diagram of the measuring complex, describes the electronic components of the radiometer, as well as the block diagram. Signal transformations (spectrum transfer, filtering, accumulation) are implemented programmatically on the basis of a digital processing module. The device can detect the presence of specific elements in various environments, as well as protect people from the harmful effects of adverse radiation and can be used both in the field and stationary.

The construction and selection of a suitable bijective function, that is, substitution, is now becoming an important applied task, particularly for building block encryption systems. Many articles have suggested using different approaches to determining the quality of substitution, but most of them are highly computationally complex. The solution of this problem will significantly expand the range of methods for constructing and analyzing scheme in information protection systems. The purpose of research is to find easily measurable characteristics of substitutions, allowing to evaluate their quality, and also measures of the proximity of a particular substitutions to a random one, or its distance from it. For this purpose, several characteristics were proposed in this work: difference and polynomial, and their mathematical expectation was found, as well as variance for the difference characteristic. This allows us to make a conclusion about its quality by comparing the result of calculating the characteristic for a particular substitution with the calculated mathematical expectation. From a computational point of view, the thesises of the article are of exceptional interest due to the simplicity of the algorithm for quantifying the quality of bijective function substitutions. By its nature, the operation of calculating the difference characteristic carries out a simple summation of integer terms in a fixed and small range. Such an operation, both in the modern and in the prospective element base, is embedded in the logic of a wide range of functional elements, especially when implementing computational actions in the optical range, or on other carriers related to the field of nanotechnology.

In this paper we consider the problem of finding a blackhole pattern in directed unweighted graphs. The problem statement is the same as in an original paper by scientists from University of New-Jersey published in 2010. The paper contributes to the special graph pattern matching, the work results can be used for anomaly detection in finances, natural disasters, urban analysis. This paper aims to propose a novel algorithm for blackhole mining, which would take into account inner structure of the “blackhole” pattern and utilize this knowledge for more efficient mining. This paper reviews previously published solutions and tests them on larger graphs containing up to 1 million of nodes. In particular, an iBlackhole algorithm and its Divide and Conquer modification iBlackholeDC are considered, their weak spots are highlighted and reviewed upon. Graph condensation is introduced as an efficient preprocessing for the problem. This paper provides theorems and definitions describing inner structure of the blackhole pattern. Based on the new theorems, a new approach to enumeration of candidates is introduced as well as rules and heuristics aiming for faster filtration of candidates: they utilize topological sorting of a graph and definition of a “special” node, which is also introduced in this paper. Special nodes properties are described. We propose a novel TopSortBH algorithm. It consists of the graph condensation, candidates enumeration and heuristics for candidates filtration. The algorithm is provided with modification called FastSkip, which allows for more aggressive filtering strategy in time-sensitive cases. All mentioned algorithms are implemented and tested on the IBM Power8 based system. Experimental results show efficiency of the condensation as graph preprocessing for the problem. Strong advantage in found blackholes count is demonstrated for TopSortBH in comparison to iBlackholeDC on RMAT, SSCA2 and UR graphs containing up to 1 million nodes.

This article presents the results of research on the influence of various methods of drying and calcining welding electrodes coated with acid-rutile type standard technology in electric furnaces and in furnaces using nanostructured functional ceramics (NFC) radiation on the welding and technological properties of welding electrodes. According to the results of research, the improvement of welding and technological properties during the drying and calcining of welding electrodes in a furnace using radiation with NFC was revealed. Calcination of welding electrodes using NFC radiation allows to obtain high-quality welding and technological properties of coatings without the use of natural drying after coating the welding wire. This makes it possible to perform heat treatment of welding electrodes with great savings in power consumption and reduced calcination time compared to standard technology.

As was mentioned by known sociologist Kenneth Ewart Boulding, the human community, divided into various social organizations, is the most complex class of biological systems. This article is dedicated for mathematical modeling of the process of historical interaction between Russians and foreigners, which are reflected in the formation of a living Russian language. The difficulty lies not only in the large number of relationships, but also in the complexity experienced by the researcher who is inside the system under study. The natural desire to abstract in this study from the system itself can be realized using a strictly scientific approach and computational programming. Namely, by using formal objects and the same formal methods of comparing them, as is customary in mathematics, physics, and other sciences that study the laws of nature in areas that are not directly related to human being and society. To form an objective knowledge base about the interaction of social groups of people, you can use the analysis of traces of this interaction, one of which is their language. It is in the language of a people that the main factors of influence of other peoples - native speakers of another language-remain. These traces, in particular, are borrowed words and expressions. To work with such words and expressions, you must first discard those matches that can be attributed to random. Only in this case can the nature of our research be objective. This article uses statistical analysis methods to identify the fact of accidental coincidence of phonetic and semantic images of words from different languages. The basic tool we have chosen is the birthday paradox theorem. As a result, a method for identifying borrowed words that appeared in the language as a result of the interaction of native speakers of different languages, excluding the random nature of their coincidence, is obtained. The application of software definition of matching words in digitized dictionaries is justified. The method is applied to the Russian language. Conclusions are made about the history of the development of the Russian people and its language. These conclusions are that the main significant influence on the Russian population and its language was exerted by Europeans, primarily the French. At the same time, no traces of the influence of Mongolian or other Eastern languages were found. The influence of the Turkic language group and the Greek language occupy a middle position. At the same time, if the semantic load of Turkic and Greek borrowings is of a general scientific or economic nature, then European borrowings are primarily associated with trade, administration, war, and luxuries. The authors concludes that the family character of interaction between native English speakers and language groups close to the English geographically with the Russian population, since the names of the main family members are borrowed mainly from the English language, while the corresponding names was already exist in the old Slavonic language.