Science & Technique最新文献

{"title":"On Stochastic Approach to Evaluation of Service Life for Reinforced Concrete Constructional Elements and Structures during Concrete Carbonization","authors":"S. Osipov, V. M. Chik","doi":"10.21122/2227-1031-2020-19-3-241-251","DOIUrl":"https://doi.org/10.21122/2227-1031-2020-19-3-241-251","url":null,"abstract":"The currently existing deterministic models for determination of structure service life do not take into account to the full extent variety of factors that have an effect on them and also stochastic characteristics of the used natural materials and conditions for manufacturing construction products, possible errors during the process of designing and construction etc. More trustworthy approach determining longevity and growth rate of destruction processes for structures in future periods can be obtained with the help of statistic methods that take into account a probabilistic essence of the process. The paper presents a possible approach of the probabilistic analysis on reinforced concrete structure service life while assessing rates of variation in depth growth of carbonization in a concrete protective layer on the basis of the existing experimental and calculated data pertaining to changes of the given index in reinforced concrete structures of various types. Variability of the existing approaches for determination of structure longevity as a whole has been shown firstly due to various number of basic vаriables used in calculations. Stochastic processing of the data on parameters of carbonization depth in the concrete protective layer has been carried out and this processing has made it possible to determine variation rates which allow to assess the presupposed service life of reinforced concrete structures having similar characteristics and being operated under analogous conditions. A definitive non-uniformity in statistic indices has been established that testifies about the necessity to increase accumulation of data on the investigated characteristics and to execute its processing more thoroughly. An expedience in usage of a concrete impermeability as a main factor determining its longevity has been established on the basis of statistical assessment of the existing data.","PeriodicalId":42375,"journal":{"name":"Science & Technique","volume":"4 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2020-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85681508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"To Solution of Contact Problem for Rectangular Plate on Elastic Half-Space","authors":"S. V. Bosakov","doi":"10.21122/2227-1031-2020-19-3-224-229","DOIUrl":"https://doi.org/10.21122/2227-1031-2020-19-3-224-229","url":null,"abstract":"Until the present time there is no exact solution to the contact problem for a rectangular plate on an elastic base with distribution properties. Practical analogues of this design are slab foundations widely used in construction. A lot of scientists have solved this problem in various ways. The methods of finite differences, B. N. Zhemochkin and power series do not distinguish a specific feature in contact stresses at the edges of the plate. The author of the paper has obtained an expansion of the Boussinesq solution for determining displacements of the elastic half-space surface in the form of a double series according to the Chebyshev polynomials of the first kind in a rectangular region. For the first time, such a representation for the symmetric part of the Boussinesq solution was obtained by V. I. Seimov and it has been applied to study symmetric vibrations of a rectangular stamp, taking into account inertial properties of the half-space. Using this expansion, the author gives a solution to the problem for a rectangular plate lying on an elastic half-space under the action of an arbitrarily applied concentrated force. In this case, the required displacements are specified in the form of a double row in the Chebyshev polynomials of the first kind. Contact stresses are also specified in the form of a double row according to the Chebyshev polynomials of the first kind with weight. In the integral equation of the contact problem integration over a rectangular region is performed while taking into account the orthogonality of the Chebyshev polynomials. In the resulting expression the coefficients are equal for the same products of the Chebyshev polynomials. The result is an infinite system of linear algebraic equations, which is solved by the amplification method. Thus the sought coefficients are found in the expansion for contact stresses.","PeriodicalId":42375,"journal":{"name":"Science & Technique","volume":"27 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2020-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89738365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study of Changing Role of Leading Universities in the National Innovation Ecosystem during Transition to the University 4.0 Model","authors":"T. Maximova, E. Bogdanova, G. Brovka","doi":"10.21122/2227-1031-2020-19-3-258-266","DOIUrl":"https://doi.org/10.21122/2227-1031-2020-19-3-258-266","url":null,"abstract":"The paper is devoted to identifying patterns of activity of Russian universities in the national innovation ecosystem. Decisions on the development of innovative activity, effective commercialization and implementation of scientific developments are substantiated in strategic documents of state development. In fact the level of innovative security of a country, the state of protection of national interests of the state from internal and external threats arising from the conditions of innovative development, depends to a large extent on the success of the implementation of scientific and development projects. The leading higher education institutions are entrusted with the task of becoming centers of regional innovation ecosystems, transforming universities into active participants of socio-economic and innovative development. Official statistics on national research universities of the Russian Federation have been used in order to identify patterns of the activity of higher education institutions in this area. An analysis of the changes in the analyzed indicators has made it possible to single out universities that implement the most promising models of scientific activity management in terms of world experience. These are primarily universities for which there is a positive relative increase in indicators of total R&D, the share of extra-budgetary funds in university income from R&D, and the share of income from R&D in total income. It has been established that the current stage of development of universities is characterized by the presence of both competitive advantages and challenges that form the features of their modernization. The response to the challenges should be the creation of a business model of the University 4.0 activity which includes new technologies, products and services that are in demand in the country.","PeriodicalId":42375,"journal":{"name":"Science & Technique","volume":"31 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2020-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88199109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Estimation of Transport and Logistics Infrastructure Impact of Regions in the Republic of Belarus on its Socio-Economic Indicators","authors":"R. Ivut, P. Popov, P. I. Lapkovskaya","doi":"10.21122/2227-1031-2020-19-2-93-100","DOIUrl":"https://doi.org/10.21122/2227-1031-2020-19-2-93-100","url":null,"abstract":"Abstract. The paper substantiates the need to study a transport and logistics infrastructure of the regions in the context of its impact on socio-economic indicators for development of the Republic of Belarus.  The importance of this study is confirmed by goals and objectives for development of  the transport and logistics  systems of  the Republic  of  Belarus as outlined in the National Strategy for Sustainable Social and Economic Development of the Republic of Belarus for the period until 2030 and Republican Program for development of logistics systems and transit potential of the Republic of Belarus for the period of 2016-2020. The influence of nine indicators for  development of  the transport and logistics infrastructure in the regions of the country on six key socio-economic indicators such as gross domestic product, investment in fixed assets, revenues of consolidated budgets, average wage level, number of gainfully employed persons,  number of  registered unemployed persons has been investigated in the paper. A multiple regression analysis has been used to assess a relationship between dependent and independent variables, that is a step selection method. All the calculations have been carried out while using the IBM SPSS Statistics 20. Indicators of correlation between dependent and independent variables have been calculated and relationships between the variables have been determined in the paper. Validity of the obtained results has been checked with the help of the Student's test. The calculations have made it possible to identify key indicators for a transport and logistics infrastructure in six regions of the country which have the greatest impact on the social and economic development of the Republic of Belarus and can be used to analyze an investment attractiveness of the regions.","PeriodicalId":42375,"journal":{"name":"Science & Technique","volume":"23 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85176679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Theoretical and Methodological Foundations for Studying Network Mechanisms of Innovative Development in the Republic of Belarus","authors":"S. Solodovnikov","doi":"10.21122/2227-1031-2020-19-2-113-118","DOIUrl":"https://doi.org/10.21122/2227-1031-2020-19-2-113-118","url":null,"abstract":"The paper considers theoretical and methodological foundations for studying network mechanisms of innovative development in the Republic of Belarus and in order to reach the purpose it is necessary to specify the concept of a systematic approach in the context of the study of the indicated mechanisms and develop a methodology for conducting such investigations. Systematic and historical approaches, principles of synergetics have been used as research methods. The paper substantiates the necessity to study the network mechanisms of innovative development in the Republic of Belarus from the point of view of a systematic approach. In this case, the author has refused traditional contrast of stable, essential, regularly repeating connections and relationships in the system to random, chaotic processes, and he has proceeded from the need to consistently apply a law of hierarchical compensation, as well as taking into account such features of the development of the modern economy as the rapid evolution of network technologies, further development of the risk economy, emergence of new challenges for traditional (including old industrial) industries. This has made it possible to define a systematic approach as a se quential and comprehensive examination of  an object not as isolated  from external  influences, but as half-closed,  but with an approach to an open system in which the synergetic processes generated by evolution of network technologies, development of the risk economy, and emergence of new challenges for industrial production (including traditional ones). It has been established that a consistent and comprehensive review of the network mechanisms of innovative development in the Republic of Belarus requires not only to determine initial categories and concepts, to show general and special determining factors, genesis and development trends, but also to conduct constant monitoring aimed at identifying dynamics of needs and interests of political-economic and economic entities involved in this process, as well as material and social technologies for implementation of the needs and interests. ","PeriodicalId":42375,"journal":{"name":"Science & Technique","volume":"15 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73659294","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Strategy Design Method Based on Corporate Learning System","authors":"A. Kavaliou, A. V. Hromava","doi":"10.21122/2227-1031-2020-19-2-119-124","DOIUrl":"https://doi.org/10.21122/2227-1031-2020-19-2-119-124","url":null,"abstract":"The paper proposes a method for a strategy design that corresponds to concept of dynamic capabilities. The advan-tages and disadvantages of the methods of strategy design used by various schools of strategic management are demonstrated. The authors postulate inconsistency between a new stage of scientific knowledge and the related technique of strategic analysis and strategy design methods. The purpose of the article is to develop a method for creation a strategy based on a learning system as a key element of a competitive advantage in the concept of dynamic abilities. The method compares favorably with approaches based on the analysis of the external environment, which have a methodological contradiction, since such a stra-tegy is available to all market actors, and it is easy to repeat it. Unlike the methods of the “basic” resource concept, the proposed one allows you to expand an approach to design a strategy precisely from the standpoint of strategic actions in relation to the resources, capabilities, and competencies of the company, which can be combined into clusters that provide a syner-gistic effect. The long-term horizon of the strategy invariably requires the inclusion of corporate learning system as a gene-rator  of  organizational  capabilities into the various clusters.  It has been noted  that the speed of  reaction to changes which is required in a contemporary competitive environment puts forward a corporate learning system as a key competency of a company. The method corresponding to the concept of dynamic capabilities creates the possibility of developing a strategy based on a corporate learning system and provides a dynamic sustainable competitive advantage.","PeriodicalId":42375,"journal":{"name":"Science & Technique","volume":"40 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82633591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Communication and Marketing Technologies of Territory Promotion: Forming Professional Market in Russia","authors":"A. Chechulin, A. Kuznecov, V. Grakhov, M. Perfil'eva","doi":"10.21122/2227-1031-2020-19-2-125-129","DOIUrl":"https://doi.org/10.21122/2227-1031-2020-19-2-125-129","url":null,"abstract":"The purpose of the paper is to analyze a market of territorial marketing as a special, significantly different from the commercial  market in the post-Soviet space.  Attempts to characterize this territorial  marketing market in general have not yet been undertaken. The authors have set a task to answer questions about their understanding of the territorial marketing essence; nature of interest of any territories in general and post-Soviet territories, in particular, in the use of marketing tools in its strategic development; territorial marketing market structure – customers of such services on behalf of territories, research organizations, marketing, advertising, design and other organizations creating convenient marketing products, and furthermore means for advertisement positioning and organizations providing opportunities for special events in the interests of territories promotion. On the basis of a comparative analysis of the territorial marketing markets of a number of countries leading in the post-Soviet space which are not members of the European Union, an analysis of statistical data and expert surveys, the conclusions have been made: Russia occupies the leading place in this field - and in absolute criteria (budgets, territories need), and in quality of work. But in the recent years Kazakhstan is actively developing territorial marketing technologies and this country is ahead of Russia in a number of areas. It is important that the territorial marketing markets of Russia, Kazakhstan and other post-Soviet countries are not isolated from international ideas and market structures. The main developments for the Russian territories are based on the ideas and methodology of the British school of territorial marketing. Foreign marketing structures, primarily from Great Britain and the Netherlands almost always participate (and often win) in significant tenders for territories ordering being held in Russia and other CIS countries.","PeriodicalId":42375,"journal":{"name":"Science & Technique","volume":"107 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75774682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparing Fuel Consumption and Emission Levels of Hybrid Powertrain Configurations and a Conventional Powertrain in Varied Drive Cycles and Degree of Hybridization","authors":"W. Maddumage, K. Y. Abeyasighe, M. Perera, R. Attalage, P. Kelly","doi":"10.21122/2227-1031-2020-19-1-20-33","DOIUrl":"https://doi.org/10.21122/2227-1031-2020-19-1-20-33","url":null,"abstract":"Hybrid electric powertrains in automotive applications aim to improve emissions and fuel economy with respect to conventional internal combustion engine vehicles. Variety of design scenarios need to be addressed in designing a hybrid electric vehicle to achieve desired design objectives such as fuel consumption and exhaust gas emissions. The work in this paper presents an analysis of the design objectives for an automobile powertrain with respect to different design scenarios, i. e. target drive cycle and degree of hybridization. Toward these ends, four powertrain configuration models (i. e. internal combustion engine, series, parallel and complex hybrid powertrain configurations) of a small vehicle (motorized three wheeler) are developed using Model Advisor software and simulated with varied drive cycles and degrees of hybridization. Firstly, the impact of vehicle power control strategy and operational characteristics of the different powertrain configurations are investigated with respect to exhaust gas emissions and fuel consumption. Secondly, the drive cycles are scaled according to kinetic intensity and the relationship between fuel consumption and drive cycles is assessed. Thirdly, three fuel consumption models are developed so that fuel consumption values for a real-world drive cycle may be predicted in regard to each powertrain configuration. The results show that when compared with a conventional powertrain fuel consumption is lower in hybrid vehicles. This work led to the surprisingly result showing higher CO emission levels with hybrid vehicles. Furthermore, fuel consumption of all four powertrains showed a strong correlation with kinetic intensity values of selected drive cycles. It was found that with varied drive cycles the average fuel advantage for each was: series 23 %, parallel 21 %, and complex hybrids 33 %, compared to an IC engine powertrain. The study reveals that performance of hybrid configurations vary significantly with drive cycle and degree of hybridization. The paper also suggests future areas of study.","PeriodicalId":42375,"journal":{"name":"Science & Technique","volume":"67 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2020-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85192008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Increasing the Quality of Transient Processes in the Vehicle Transmission","authors":"A. Taratorkin, V. Derzhankii, I. Taratorkin","doi":"10.21122/2227-1031-2019-18-6-509-518","DOIUrl":"https://doi.org/10.21122/2227-1031-2019-18-6-509-518","url":null,"abstract":"The paper shows results of an experimental and theoretical study of dynamic processes in the vehicle transmission after kinematic alignment of elements during gearshifts. The purpose of the research is increasing the quality of transient processes in the vehicle transmission. Applying an analysis of experimental results obtained through looking into dynamics of a 3-ton vehicle transmission and studying literature sources it was established that dynamic loading of the transmission after the kinematic stage of shifting (i. e. synchronizing speeds of driving and driven elements in the gearbox) is influenced by oscillations which are in the single-node mode. Solving the task of increasing transient processes is achieved by applying a method of control power redistribution. By employing simulation models a number of methods were used to regulate power redistribution. Results of computations made it possible to determine that the efficiency of power redistribution are closely related to initial conditions of the process under the study. In the progress of the research a method for identifying the initial conditions was developed. This method is based determining signatures of the torque and its derivatives. In accordance with the research results it turned out that it is appropriate to apply the ZVD (zero vibration derivation) algorithm of power redistribution for low gears (below 4th) from point of view achieving better overshoot and robustness characteristics and a satisfactory response rate level. For higher gears it is recommended that the Ramp algorithm (linear increase in the control input) be used for the cases when the response rate is not longer than period of the single-node mode of oscillations occurring in the dynamic system during a gear shift. Application of the proposed algorithms allows to bring down dynamic loading of the transmission and also to improve the comfort in vehicles.","PeriodicalId":42375,"journal":{"name":"Science & Technique","volume":"69 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2019-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89416193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Signal Pre-Selection for Monitoring and Prediction of Vehicle Powertrain Component Aging","authors":"A. Sass, Enes Esatbeyoglu, T. Iwwerks","doi":"10.21122/2227-1031-2019-18-6-519-524","DOIUrl":"https://doi.org/10.21122/2227-1031-2019-18-6-519-524","url":null,"abstract":"Predictive maintenance has become important for avoiding unplanned downtime of modern vehicles. With increasing functionality the exchanged data between Electronic Control Units (ECU) grows simultaneously rapidly. A large number of in-vehicle signals are provided for monitoring an aging process. Various components of a vehicle age due to their usage. This component aging is only visible in a certain number of in-vehicle signals. In this work, we present a signal selection method for in-vehicle signals in order to determine relevant signals to monitor and predict powertrain component aging of vehicles. Our application considers the aging of powertrain components with respect to clogging of structural components. We measure the component aging process in certain time intervals. Owing to this, unevenly spaced time series data is preprocessed to generate comparable in-vehicle data. First, we aggregate the data in certain intervals. Thus, the dynamic in-vehicle database is reduced which enables us to analyze the signals more efficiently. Secondly, we implement machine learning algorithms to generate a digital model of the measured aging process. With the help of Local Interpretable Model-Agnostic Explanations (LIME) the model gets interpretable. This allows us to extract the most relevant signals and to reduce the amount of processed data. Our results show that a certain number of in-vehicle signals are sufficient for predicting the aging process of the considered structural component. Consequently, our approach allows to reduce data transmission of in-vehicle signals with the goal of predictive maintenance.","PeriodicalId":42375,"journal":{"name":"Science & Technique","volume":"19 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2019-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91153113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}