bluuebunny/crossref_metadata_2025 huggingface dataset:
Analysis of financial incentives as an instrument of renewable energy sources management in Montenegro
Authors: Melović Boban , Ćirović Dragana
Published: March 2020

This article analyzes the effects of financial incentives implemented in Montenegro, with the aim of increasing the exploitation rate of renewable energy sources on the consumption side. Those incentives were mostly focused on households. They made it easier to obtain the funds for installing the equipment necessary for the use of solar energy and biomass, as the main energy sources, for the needs of individual households. The results show that the implemented measures had smaller effects than expected and that the interest of inhabitants for the use of renewable energy sources is still at low level. The reason for such a situation is an insufficiently developed awareness of their importance and lack of information about the way that the systems used for their exploitation work and all the benefits that those systems offer. Occasional promotional activities, carried out during the implementation of the measures mentioned above, weren’t sufficiently effective. Therefore, a continuous effort must be invested in the forthcoming period, in order to inform and educate citizens, so that the energy potentials of Montenegro could be used in a right way.
Environmental justice and implementation of environmental justice in Vietnam today
Authors: Nguyen Thi Lan Huong
Published: March 2020

Environmental justice is a topic that has been mentioned a lot in the world. However, in Vietnam, this is a field that is not directly discussed, especially from the perspective of academic studies. The complex nature of this topic requires an interdisciplinary view, in which it is impossible to lack the interpretations from the socio-philosophical perspective. Therefore, understanding, interpreting, and exposing its contents from the theoretical aspect, is the one of the research directions that needs to be clarified, especially in the con text of Vietnam. Stemming from the above judgments, this article analyzes and clarifies two main issues as follows: 1. Environmental justice and the basic principles of environmental justice implementation in Vietnam; 2. Reality of implementing environmental justice in Vietnam.
Organization of planning in transport construction
Authors: Kazaryan Ruben , Andreeva Peraskovya , Galaeva Natalya
Published: March 2020

Purpose. Development of methods and models of economic efficiency of the integrated use of various modes of transport in the interests of ensuring national security of the state. Methods. System analysis, logical-mathematical modeling, systems theory, economic-visual modeling, research methods of operations, economic and mathematical methods. Results. The paper discusses the need for the application of economic and mathematical models in the design of transport construction (model of “moving the earth masses”, linear programming model, design of the “red line” on the longitudinal profile, dynamic programming model). Conclusion. The difficult stage of the transition of economic and mathematical analysis from the verbal description of the system process to the elemental base of the mathematical apparatus. Most research models of operations are designed for single criteria. Economic and mathematical modeling allows the effect of “private optimization”.
Intellectual capital management within the framework of the VBM concept
Authors: Pirogova Oksana , Plotnikov Vladimir
Published: March 2020

Currently, the process of forming new management concepts is ongoing in Russia. At the same time, on the way to the development, creation and implementation of modern concepts, approaches and management systems at domestic enterprises there are several problems, one of which is the problem of intellectual capital management based on the VBM concept. Issues related to the definition of the concept of “intellectual capital”, its assessment and management are relevant. The article discusses the features of the VBM concept at the enterprise level, its advantages and disadvantages, implementation problems. The analysis performed in the study made it possible to clarify the economic content of the concept of intellectual capital and identify its key features that allow characterizing it and using specific assessment methods. The article describes the main methods and indicators for assessing intellectual capital, based on which an approach to the assessment and management of intellectual capital of an enterprise is proposed. The approach is based on a combination of two methods for calculating intellectual capital CIV and MVAIC. The first technique allows to assess the amount of intellectual capital of the enterprise. The second technique allows to reveal the structure of intellectual capital. The joint use of techniques allows to get a valuation of the intellectual capital of the enterprise and evaluate the effectiveness of investments in the development of its components. Criteria for assessing the effectiveness of investments in elements of intellectual capital are proposed.
Integration interaction of Russia and China in the conditions of digital transformation of the economy
Authors: Vertakova Yulia , Kryzhanovskaya Olga , Shuyi Ding , Yayi Liu
Published: March 2020

In the context of the active digitalization of the economic space, a fundamental transformation of thinking, methodological approaches to the development and implementation of public policy and its tools for building effective integration interaction to achieve strategic advantages in a strategic perspective is taking place. It is these circumstances that determine the relevance of the research topic. The purpose of the publication is to study the features of the integration interaction between Russia and China in the context of the digital transformation of the economy. The study is based on the modern methodology of economic analysis, performed using the deductive and inductive approaches, using the methods of comparative, structural-logical, statistical analysis. As a result of the study, it was proved that the development of long-term relations between Russia and China is based on the virtual exchange of resources in the context of the digital transformation of the economy.
Model of evaluation the energy-efficient technologies in construction
Authors: Okolelova Ella , Shibaeva Marina , Efimiev Alexey , Kolesnikova Victoria
Published: March 2020

The article discusses methods of unconditional optimization to solve the problem of choosing the most effective energy-saving technology in construction. The optimization condition has chosen the value of the rate of reduction of energy consumption during operation of the facility. The task of determining the most effective energy-saving technology is to evaluate how quickly the reduction of consumption of thei-type of energy occurs. For the solution, unconditional optimization methods were used: the steepest descent method and the gradient method. An algorithm has been developed to search for the minimum value of the function when solving the problem using the coordinate-wise descent method. The article presents an algorithm for determining the unconditional minimum using the Nelder-Mead method, which is not a gradient method of spatial search for the optimal solution. The methods considered are classic optimization methods. If there is a difficulty in finding a function on which the functional reaches its minimum, then these methods may not be effective in terms of convergence. In many problems, in particular, when sufficiently complex functions with a large number of parameters are used, it is most advisable to use methods that have a high convergence rate. Such methods are methods for finding the extremum of a function when moving along a gradient, i.e. gradient descent. The task of finding the minimum function of energy consumption is defined as the task of determining the anti-gradient of the objective function, i.e. function decreases in the opposite direction to the gradient. The direction of the anti-gradient is the direction of the steepest descent.
Accounting and analytical support of internal management reporting on reclamation works
Authors: Klychova Guzaliya , Zakirova Alsou , Khusainov Shaukat , Dyatlova Angelina , Raheem Ullah , Sagadeeva Elza
Published: March 2020

In modern conditions, the objective need for the functioning of an agricultural organization is to maintain management accounting and the formation of internal management reporting. The internal management reporting contains information that is used by the management of the organization in making informed operational and strategic management decisions. However, in developing the format of internal reporting there are problems with the definition of a set of indicators necessary to assess the effectiveness of financial and economic activities of the enterprise. The purpose of the article is to justify the theoretical provisions and development of practical recommendations for the development of accounting and analytical support for the formation of internal reporting on reclamation work. Objectives of the study: to study the theoretical aspects, methodological tools, to determine the stages of formation of internal management reporting, to develop forms of management reports containing basic indicators to assess the effectiveness of reclamation activities. When writing this article, such methods as analysis of scientific and theoretical sources, system approach, method of comparative analysis, generalization were used. The approach suggested by the authors to the formation of internal management reports allows to form a system of accounting and analytical information, which allows to solve organizational, economic and production problems arising in the process of managing the enterprise. The system of indicators, contained in the developed formats of management reporting, is a tool that characterizes the effectiveness of management.
Complex approach to organizations’ capital assets reproduction
Authors: Birjukov Aleksandr , Dobryshkin Evgeniy , Birjukov Yurii , Tishchenko Vladimir
Published: March 2020

Effective production activities of organizations is impossible without the concept implementation of the constant reproduction of capital assets, a significant part of which is represented by buildings and structures for various functional purposes. Increased deterioration of industrial buildings does not allow to solve such important tasks as improvement and automation of production processes in their entirety, and has a negative impact on the working conditions and safety of personnel. The analysis of scientific and normative literature is showed that the issue under consideration requires further research. Author’s approach to the reproduction of capital assets, the use of which allows to increase the management decisions efficiency on the basis of a complex of tasks for the joint estimation of damage and deterioration, planning of works under the given constraints with the use of mathematical apparatus and technological solutions for monitoring the technical condition of buildings is presented in the article.
Adaptive method of detecting traffic anomalies in high-speed multi-service communication networks
Authors: Ageev Sergey , Karetnikov Vladimir , Ol’khovik Evgeny , Privalov Andrey
Published: March 2020

In the paper, an adaptive hybrid heuristic (behavioral) method for detecting small traffic anomalies in high-speed multiservice communication networks, which operates in real time, is proposed and investigated. The relevance of this study is determined by the fact that network security management processes in high-speed multiservice communication networks need to be implemented in a mode close to real-time mode, as well as identifying possible network security threats in the early stages of the implementation of possible network attacks. The proposed method and algorithm belong to the class of adaptive methods and algorithms with preliminary training. The average relative error in estimating the evaluated traffic parameters does not exceed 10%, which is sufficient for the implementation of operational network management tasks. Anomalies of the expectation of traffic intensity and its dispersion are identified if their valuesexceed the normal values by 15% or more, which makes it possible to detect possible network attacks in the early phases of their implementation, for example, at the stage of scanning ports and interfaces of the attacked system. The procedure for detecting anomalous traffic behavior is implemented based on the Mamdani’s method of hierarchical fuzzy logical inference. A study of the proposed method for detecting anomalous behavior of network traffic showed its high efficiency.
Ontologization of tools for modeling and synthesis technological process trajectories
Authors: Mokhov Vasily , Shaykhutdinov Danil , Kirievskiy Evgeniy , Vlasov Alexander , Gorbatenko Nikolay
Published: March 2020

The publication is devoted to the development of an ontological model of tools for intelligent modeling and synthesis of the trajectories of technological processes in electric power networks. Development includes two levels of modeling: the level of metaontology and the level of applied ontologies. At the upper level, the structure of the upper level is proposed and described. At the level of applied ontologies, the ontology of the “digital substation - distribution network” system and the structure for the ontology of tasks are detailed. The first is implemented and presented in the Protégé framework environment. The second is presented descriptively by the example of the task of minimizing energy losses at the level of a transformer substation with an illustration of a functional diagram of the technological chain of its solution. The findings of the work reflect the potential of using the proposed solution to prepare an integrated knowledge management system in the subject area.
Flexibility and security policies for elderly workers: a case study in Vietnam
Authors: Doan Thi Mai Huong , Ngo Quynh An
Published: March 2020

National policies in Vietnam show policy shifts towards active ageing and to improving flexibility and security in the labour market. The main question relates to the practice and the introduction of these macro policies at the workplace level is how an employer can combine greater flexibility for the organisation as well as work security for older workers. This paper presents the findings of a survey of wage paid elderly workers and human resource officer in Vietnam (Hanoi, Thaibinh, Ninhbinh) (n=39 companies and 428 elderly workers). A flexibility combining security approach for senior workers is most visible in the Vietnam workplaces because of a broader range of facilities such as phased retirement, flexible working hours, education and training, and wage flexible. The survey shows different strategies addressing the issue of older workers. The transport and telecom service sector favour for flexibility in recruitment. The education and health sector are still focused on a ‘relief’ strategy (adapting workload, tasks and working hours), while the construction industry favour and employability policy. Most of the workplace policies for senior workers show passivity in all items favours flexibility of the organisation, only small rate favour employment security for the workers.
Innovation-driven development and quality of living under conditions of digital economy
Authors: Gagulina Natalya , Samoylov Alexander , Novikov Andrey , Yanova Elena
Published: March 2020

The spread of digital innovation in the world began in the 1960s. and the first stage came down to the automation of technologies and processes. The next stage came in the mid-90s. and is associated with the global spread of the Internet and mobile communications, the extensive penetration of innovation into society. The current stage of innovatiоndriven development is characterized by the expansion of Internet access of millions of consumers, the integration of wide range of digital services, products, systems into the digital socio-ecological and economic system. The ongoing revolutionary changes deserve additional understanding and analysis, since they give to many countries such impetus for rapid growth that they change the very paradigm of development, and force them to measure and evaluate the life quality in a new way. In the context of problems covered in this article, it is especially relevant to conduct a causal analysis of digital transformation against the background of global transformations of the world economy.In the process of analyzing innovation as a tool for the development of public production, the authors identified the drivers of digital economy, determined their role at the present stage, and showed their distinctive aspects and features.
The logistics network digital twin in view of concept of the non-destructive quality control methods
Authors: Kapustina Irina , Kalinina Olga , Ovchinnikova Alina , Barykin Sergei
Published: March 2020

The purpose of the research consists in improving the theoretical basis for non-destructive quality control methods in the context of digitalization and an active transition to Industry 4.0. The methodology used by authors include the consideration of the logistics network digital twin, as well as globalization of markets and ever-increasing global competition in all areas. The article discusses non-destructive quality control methods based on the process of modeling digital twins and the authors’ approach proves the advantages of just such an innovative concept of expanding the definition of logistics network digital twin in comparison with the traditional methods of non-destructive quality control. It could be shown that this approach eventually leads the ability of industries to switch to digitalization of their processes. Saying precisely the improving of the quality control methods could be treated as digitalization of their supply chains, reflecting the entire product life cycle. We have displayed a digital supply chain, which includes the method of non-destructive testing, like a digital twin. The main difference between the digital supply chain and the traditional supply chain is noted. The ideas of large audit companies such as Gartner’s, Siemens and Deloitte are analyzed. What are the benefits of using a digital twin as a non-destructive testing method? All participants of this digital supply chain receive their benefits in terms of digitalization and market competition.
RITM3 as the Digital Platform for Traffic Management in Smart Cities
Authors: Burmistrov Andrey , Siniavina Maria , Rasskazova Olga , Alexandrov Igor
Published: March 2020

The paper reviews major problems of cities related to the management of transport flows; it looks at fundamental Russian legislative acts regulating the improvement of the urban transport management systems; briefly reviews information about the Adaptive Traffic Control Systems which are extensively used across the world cities and reflects on the capabilities of the Russian digital platform RITM3 (Real time Integration Transport Measurements Modeling Management), which is the evolution of the TransInfo software developed by the St. Petersburg company SIMETRA (formerly “A+S Transproject”). Digital platform RITM3 is designed for modeling traffic flows in cities and proactive traffic management in real time. The article also provides information about the experience of digital platform RITM3 application in Moscow.
Demand management by active consumers in intelligent electric power systems
Authors: Tretyakov Evgeny
Published: March 2020

The approaches to demand management by active consumers through forming a given schedule of power consumption in the required period of time based on the solution of the optimization problem in the form of maximizing the power of connected controlled electric receivers of various types are presented. The model of demand management by active consumers is justified, taking into account the following factors: load sensitivity for connecting a transformer substation to a change in consumer load; load priority; consistent load reduction levels with flexible performance and power control; permissible set of electric receivers in accordance with the technological process, network schedule, other logical conditions corresponding to adjacency lists. An algorithm has been developed for limiting power on the part of active consumers based on the widespread use of digital data processing technologies, modern technical means of measurement, control and switching of end consumers in real time. The presented research results indicate the validity of the demand management method by active consumers in the normal mode of intelligent electric power systems and the possibility of its practical implementation in an industrial enterprise with reference to the technological process.
Digitalization of logistics hubs as a competitive advantage of logistics networks
Authors: Kapustina Irina , Bakharev Vladimir , Barykin Sergei , Kovalenko Egor , Pasternak Kseniya
Published: March 2020

The article reveals the concept of a logistics unit, logistics and digital hubs. The aim of the study is to assess the competitive prospects for digitalization of the Russian logistics block of the Northern Sea and New Silk ways as a set of international logistics and digital hubs, as well as exhibition complexes and educational sites. The research is focused on combining the logistics sections of the Northern Sea Route and the New Silk way into a single logistics system with its further registration in digital space. The main goal of this system is to unite all available resources of the Russian Federation in its block of the international logistics system to attract the largest number of partners and customers. It is considering the possibility of combining the Northern Sea and New Silk way sections into a single system on the territory of the Russian Federation. The authors investigated the ways of digitalization of the logistics block of the NSR-NSW with the subsequent creation of a virtual space for the control and redistribution of trade throughout the Russian Federation. During the research, studies were conducted in the field of public administration, which use modern digital communications and digital security systems. Possibilities of implementing a system of digital hubs based on the results. As a result of the study, potential positive results from the implementation of the project of digital inter-hub networks in both the economic and social sectors were highlighted.
Optimization of activities of road construction company based on lean manufacturing tools
Authors: Minnullina Anna , Solopova Natalya
Published: March 2020

The article proposes an algorithm for implementation of lean manufacturing in relation to a company in the road construction industry. The concept of lean manufacturing involves the possibility of using several tools at the same time to solve the problems and losses encountered during construction and installation works. The results of testing a tool such as a 5S system in a road construction company are presented to confirm simplicity and effectiveness of the proposed recommendations.
An integrated way to improve the properties of soil-cement pile foundations
Authors: Seregin Nikolay
Published: March 2020

The scientific article presents the results of the development of a method for improving the properties of soil-cement pile foundations by the drilling-mixing method using mechanical activation of soil-cement mixture in filler soils. Two methods for improving filler soils are considered. The choice of the mathematical methods for the research is justified. The feasibility of a complex combination of mathematical modeling methods and experimental design to achieve the goal set in this scientific article is substantiated. The physicomechanical characteristics of soil-cement are considered: a measure of brittleness, brittleness coefficient, compressive strength, splitting strength, strength variation coefficient. Based on the research, practical recommendations are given for improving soil-cement pile foundations.
Primary energy consumption for insulating
Authors: Terekh Maksim , Tretyakova Darya
Published: March 2020

In this article a mathematical model for thermal protection level analysis is developed. It is based on the consumption rate of primary energy. It allows to calculate the relevant thickness of the selected insulation material under any climatic and economic conditions with any constant layers of building envelope taken from structural considerations. The key factors influencing the model are also evaluated. The main factors to influence the energy model are the region degree-days and the energy consumption rate for the production, transportation and installation of the insulation material. The following results were reached: this approach requires the data, which sometimes has no public access, provides us with an objective assessment criteria when comparing the level of building thermal protection in different countries.
Experimental study of wind impact on multilevel industrial scaffolding
Authors: Frishter Lyudmila , Lukin Maxim
Published: March 2020

In the article, the local stress-strain state of structures and constructions is investigated, various variants for the design of the boundary are taken into account: special lines, points. The acting forced deformations don’t satisfy the compatibility conditions. They have a finite discontinuity along the contact line (surface) of the domains, including the irregular point of the boundary, causing stresses. The subject of article is stress concentrators the singularity of the stress-strain state of structures and constructions exhibiting “constructive heterogeneity” and discontinuous forced deformations determined on polymer models of photoelasticity and defrosting of deformations. A complex theoretical-numerical-experimental approach, for obtaining and analyzing the stress state in the neighborhood of the irregular point of the plane domain boundary, is proposed to extrapolate reliable experimental data to a domain where the fringe contour is not readable.
The stability of the wall of the main beam of the movable bridge (application of SP method)
Authors: Chizhov Sergey , Pismak Artyom , Antonyuk Anatoly
Published: March 2020

The objects of the article are: analyze the work of the main beams of the movable span of the drop-down system near the axis of rotation; analyze the stress-strain state of the main beams of the movable span of the drop-down system near the axis of rotation; analyze the acceptability of the normative methodology (SP) for calculating the stability of the wall of a continuous steel beam during the design and calculation of movable bridge of the drop-down system. A computational-mathematical model of the movable span of the drop-down system is developed in a modern computational software package based on the finite element method. The main disadvantages of the normative methodology (SP) for calculating the wall stability of a continuous steel beam which used in design and calculation of movable bridge of a drop-down system are presented.
Dynamic Interaction of the “Bridge-Train” System on High-Speed Railways
Authors: Diachenko Leonid , Smirnov Vladimir
Published: March 2020

This work contains the results of a research of the dynamic processes in the “bridge-train” system while passenger trains move over a bridge structure (overpass) in high-speed. The article presents the methodology of mathematic modelling, and the basic differential equations of the studied system elements motion are provided. Also there is a description of dynamic interaction of the bridge-train system numerical model based on the FEM. In general, taking into account in the design scheme of the “bridge” system not only spans, but also piers with a foundation, it is possible to more accurately determine the values of the bridge natural frequencies, which is a key factor in assessing the dynamic response of a structure when passing a high-speed train.
Some principles of generating seismic input for calculating structures
Authors: Uzdin Alexander , Prokopovich Sergei
Published: March 2020

In this paper different models of seismic input are analyzed. The most essential characteristics of seismic effects are peak ground acceleration, peak ground velocity, peak ground displacement, Arias intensity, cumulative absolute velocity, seismic energy density, harmonic coefficient κ, pseudo spectral kinematic characteristics, root-mean-square peak kinematic characteristics, plastic forces work and damage spectrum. The influence of seismic impulse on characteristics of seismic input is studied. A.A. Dolgaya’s and L.N. Dmitrovskaya’s models with seismic impulse are compared. L.N. Dmitrovskaya’s model allows to reach estimated values of energy characteristics of seismic input with the smallest deviation. When generating such processes, it is important to take into account both the properties of real actions and the limiting state of the calculated structure. The considered models of seismic inputs should be applied in the following cases: a) in case of designing mass construction projects when it is not possible to get a package of design accelerograms, b) in typical designing when the design object can be located on sites with different seismic and geological conditions, c) at early stages of designing important objects when the package of design accelerograms is not available yet but it is necessary to make technical solutions.
Determination of the type of repair work based on the results of survey and monitoring of the technical condition of buildings
Authors: Birjukov Aleksandr , Lebedkin Anatoly , Birjukov Yurii , Pchelkin Viktor
Published: March 2020

This article is devoted to structural scrutiny of a building. The technical condition of buildings affects such characteristics of a building as safety, reliability, durability and maintainability. However, in the absence of reliable information on the technical condition of buildings, structural survey or monitoring of а building in order to determine the category of technical condition is necessary. The purpose of this work is to develop an economic and mathematical model for determining the type of maintenance work based on the results of structural scrutiny and monitoring of a building. The article is of importance because the final stage of the survey gives a qualified opinion on the level of structural scrutiny of a building, and on the basis of this opinion repair work eliminating physical and moral deterioration and providing in accordance with specifications renovation of the building are planned. The scientific novelty of the economic and mathematical model developed by the authors on the results of building structural scrutiny lies in the application of the fuzzy set theory and fuzzy logic method for determining of the level of physical and moral deterioration of a building consistent with a certain type of repair work and followed by the necessary capital investments.
Determination of fundamental criteria in the selection of a construction system
Authors: Fakhratov Mukhammet , Sinenko Sergey , Akbari Mohammad , Asayesh Farid
Published: March 2020

There is a lack of an efficient systematic approach to the selection of appropriate construction methods for modern building systems. Identifying key criteria is necessary to help decision-makers in implementing the principles of this process. The present article was conduct for the same purpose. In this article, after reviewing of the literature, we found that construction experts’ opinions did not consider until now. Thus, we considered the opinion of experts in the field of the construction industry (Technical and executive specialists of the Afghanistan’s Ministry of Urban Development and Housing, Technical and executive specialists of the Kabul Municipality and Omran Houlding Group). For identifying key criteria, “64” criteria have been extracted that affect the selection of modern building systems and are classified into “six” economic, qualitative, social, environmental, executive and technical groups. A comprehensive study conducted through the distribution of questionnaires. The collected data were analysed using SPSS statistical software; the main criteria ranked by using “Friedman’s statistical test”. Based on the results of statistical tests, 18 criteria were determined and ranked as fundamental criteria. Therefore, paying attention to these criteria for the selection of appropriate construction methods for modern building systems can help experts in the country of Afghanistan.
About frost resistance of the contact zone of dry adhesive mixes classes C1 and C2
Authors: Nesvetaev Grigory , Dolgova Anna , Revyakin Alexey
Published: March 2020

The purpose of the study: to identify the effect of the dose of redispersible polymer powders and the type of low-modulus inclusions on the frost resistance of dry adhesives mixes made using Portland cement with the concrete base. Methods of research: The research was carried out on the basis of 75 freezing-thawing cycles. The following parameters were determined: compressive and flexural strength on samples 40x40x160 mm in accordance with GOST 30744; bond strength to the concrete base after 28 days hardening and after 75 cycles of freezing and thawing in accordance with GOST 31356. The dynamic modulus of elasticity was determined by the value of the ultrasonic pulse velocity on samples of 40x40x160 mm. The influence of prescription factors on the ratio of these values after 75 freeze-thaw cycles relative to the values after 28 days hardening under normal conditions was studied. Main results: The coefficients of frost resistance of the contact zone of the adhesive mortar made using dry mixes after 75 cycles of freezing and thawing exceeds the values of the coefficients of frost resistance according to the criteria of strength or dynamic elastic modulus. Dry adhesives mixes of class C1 with a dosage of redispersible polymer powder from 1 to 3% and an air-entraining admixture after 75 freezing cycles may be corresponded to class C2. The coefficient of variation in the compressive strength of mortar inside a series of samples after 28 days of hardening under normal conditions is not appropriate to consider as an indicator of the homogeneity of the mortar structure, potentially having a high resistance to cyclic freezing-thawing.
Energy modernization of housing stock
Authors: Ovchinnikova Svetlana , Kalinichenko Michail , Markina Nina , Schneider Elena
Published: March 2020

The tasks of resource and energy saving in the housing and communal environment of districts, the search for the most favorable development in the control of the technical condition of the housing stock are the focus of many foreign and domestic studies. This paper presents a review of the problem of energy modernization of the housing stock. In the context of the research problem, the housing sector will be considered by analyzing several conditions. The identification of predominantly influencing factors that affect the transformation of changes in the housing stock is of crucial importance. A clear definition of these ratios within the system under study leads to accurate accounting and forecasting of the state of the housing stock. When studying the issue of energy modernization of residential real estate, it is important to differentiate and streamline, taking into account economic indicators, the composition and structure of works. A mathematical model for optimizing the modernization process using dynamic programming methods is presented. Based on the scheme of dynamic planning for the most appropriate allocation of funds for energysaving measures in general, a method for the most favorable regulation of the housing stock has been created. Energy modernization of the housing stock leads to a reduction in spending on housing and communal services, and contributes to improving comfortable living conditions for citizens.
Flame spread on the pitched roof covering from a single ignition source
Authors: Gravit Marina , Polishchuk Evgenii , Dmitriev Ivan , Shakhova Mariya
Published: March 2020

The aim of this work is to conduct the assessment of the development of a fire on a waterproofing carpet as a result of exposure to a low-power ignition source outside the roof structure. In this article, tests were carried out according to the method of CEN/TS 1187:2013, Test 2 and Test 3 to determine the fire hazard of a roofing composition with a wooden frame and a coating, which consist of shingle «TECHNONICOL», galvanized steel profiled sheet and steel waterproofing layer with polymer coating. According to the results of the tests, the roofs with shingle are practically not inferior to similar roof structures with a coating of metal sheets in terms of fire safety. The test results showed that despite the presence of combustible materials in the composition, certain structural solutions allow to obtain class Broof (t2) (mean damaged length of the roof covering and substrate ≤0.550 m at 2 m/s wind speed) and Broof (t3) (time for external fire spread to the edge of the measuring zone TE≥ 30 min and time to fire penetration Tp≥ 30 min). However, these tests are not related to large scale reference tests.
Feasibility of using of accelerated test methods for determination of frost-resistance for concrete
Authors: Pavlenko Anna , Mishakova Anastasia , Pertseva Olga , Ivanova Victoriia , Olekhnovich Yanis , Averchenko Gleb
Published: March 2020

The article presents the results of studies of innovative materials in the field of testing frost resistance. In fact, present accelerated methods for the determination of concrete frost resistance have high labour consuming and low effectiveness. Moreover there is no such accelerated methods which can be sufficiently applicable fro different innovative concretes, for example, concretes with SAP or self-compacting concrete and so on. Therefore, it is highly important to investigate new accelerated test method with high operability, efficiency and sufficient precision. Previously, two new methods were developed. The main purpose of the research is to compare these methods by evaluation of their technology and accuracy and, consequently, to identify the more sustain and efficient one. First method is based on estimation of energy release due to mechanical fracture and thermo cycling. Second method consists of the calculation value z (relation between relative decreasing of strength and relative strain in the direction perpendicular to compression) and replacement of thermo cycles by mechanical cycles. Both methods have high operability and do not take a lot of time, in was tested on the 10 specimens made of concrete and results were compared with values derived by standard method.
Modeling the work of a steam-water injector in a heat supply system
Authors: Kitaev Dmitry , Aralov Egor , Bugaevsky Dmitry , Makarov Artem
Published: March 2020

One of the energy-efficient technologies is the use of injectors in heat supply systems. Steam-water injectors are very sensitive to changes in the thermodynamic parameters of water and steam. The operating range of such devices is limited to boiling liquids. The search for ranges of thermodynamic parameters that ensure the operation of the injector in real conditions of functioning of heating networks is an urgent task. The maximum energy-saving effect can be achieved by replacing devices that reduce steam pressure by injectors in which there will be a simultaneous decrease in steam pressure, heat transfer between steam and return network water to achieve the necessary thermodynamic parameters of the mixed flow. The article presents the results of modeling the operation of a steam-water injector with a cylindrical mixing chamber, taking into account the actual values of temperatures and pressures in the heating network. With constant parameters of hot steam, the possible ranges of the injector for the temperatures and pressures necessary for the implementation of temperature schedules for regulating heating networks are determined. The procedure for identifying input parameters that ensure the implementation of temperature schedules of heating networks has been carried out. Equations are obtained that allow one to determine the temperature of the water leaving the injector from the injection coefficient for the found working pressure ranges of the injected water.
Analysis of long-span bridge fluctuations for finding its optimal safe operation
Authors: Smirnova Elena
Published: March 2020

The paper studies the intense oscillations sustained by the Volgogradsky Bridge on May 20, 2010. The studies were carried out based on physical and mathematical experiments. The introduction indicates the causes of emergence of the intense aeroelastic oscillations. Description is given of the physical nature of one of the types of these oscillations, i.e. stall flutter. Catastrophes are considered that had been caused by the flutter. Methodological fundamentals of the experiment are named and modern software capabilities of computer-aided fluid and gas dynamics are listed. The results of the experiment are supplied, including visualization of the Karman vortex street and determination of the Strouhal number. The recalculation of the experimental data to natural conditions is substantiated. A description is given of calculation of the bridge’s aeroelastic oscillations. The main results of the aerodynamic calculation are supplied: the Strouhal numbers and critical velocities. The results of mathematical and physical experiments tallied well. A tally of the calculation and estimated full-scale results is pointed out. Results of this calculation (bridge oscillation amplitudes) are supplied. The conclusions point to the prospective viability of the mathematical experiment method. The proposed methods can minimize risks for the construction of long-span girder bridges, ensuring the precise estimation of their subsequent safe operation.
Low Level Continuous Heat Wraps can Increase the Efficiency of Transcutaneous Electrical Nerve Stimulation for Pain Management
Authors: Petrofsky Jerrold , Laymon Michael , Lee Haneul
Published: March 2020

Both transcutaneous electrical nerve stimulation and superficial heat have been used for pain management. While heat has been shown to have a beneficial effect on pain, transcutaneous electrical nerve stimulation remains controversial. The purpose of the present study was to see if heat, when added to transcutaneous electrical nerve stimulation, would provide more consistent relief. A total of 180 subjects participated in this study and were randomly divided into 12 groups. Low level continuous heat was applied while electrical stimulation was applied at 2 intensities, 2 frequencies and with 2 waveforms for 4 h. Outcome measures were subjective pain scale, range of motion of the back and skin blood flow of the back. The control groups had no significant difference in pain, range of motion or skin blood flow comparing the data at the beginning and 4 h after (p> 0.05). There was a small reduction in pain with transcutaneous electrical nerve stimulation alone while all other groups had a significant improvement in range of motion free of pain, reduction in pain, and increase in skin blood flow from the beginning to the end of the 4-hour period. Since transcutaneous electrical nerve stimulation with low level continuous heat showed better outcomes then transcutaneous electrical nerve stimulation alone or low level continuous heat alone, combining the 2 interventions seems to offer better outcomes for pain management for health care professionals.
A Versatile, Diels–Alder Reaction-Based Approach to Prenyleudesmane Diterpenoids: A Concise Total Synthesis of Sinupol
Authors: Ota Koichiro , Miyaoka Hiroaki , Kamaike Kazuo
Published: March 2020

Herein, a concise strategy designed to provide general and diversifiable access to various prenyleudesmane terpenoids is described and utilized in the asymmetric synthesis of a biologically active prenyleudesmane diterpenoid, sinupol, which is accomplished in a seven-step procedure.
Environmentally Friendly Nafion-Mediated Friedländer Quinoline Synthesis under Microwave Irradiation: Application to One-Pot Synthesis of Substituted Quinolinyl Chalcones
Authors: Wang Cheng-Chung , Chan Chieh-Kai , Lai Chien-Yu
Published: March 2020

An efficient and eco-friendly synthetic route for Friedländer quinoline synthesis of polysubstituted quinolines is described. This green chemical method starts from various 2-aminobenzophenones and mono- or dicarbonyl synthons and uses reusable Nafion NR50 material as a solid catalyst in ethanol under microwave irradiation. The protocol has a high generality of functional groups and provides the desired quinolines in good to excellent yields. Some structures were confirmed by single-crystal X-ray diffraction analysis.
Acute Cerebellitis and Atypical Posterior Reversible Encephalopathy Syndrome Associated with Methadone Intoxication
Authors: Salloum Shafee , Reyes Irma , Ey Elizabeth , Mayne Dustin , White Kristen
Published: March 2020

We report a case of a 9-year-old boy who presented with altered mental status and ataxia following 3 days of vomiting. Shortly after arrival to our emergency department, he declined and required intubation. The following day, he recovered and was successfully extubated. He was found to be positive for methadone on his urine drug screen. Brain imaging demonstrated a pattern of acute cerebellitis. Following extubation, the patient returned to his normal mental status; however, he began to have consistently elevated blood pressure and bradycardia and subsequent brain imaging showed supratentorial changes that were related to atypical posterior reversible encephalopathy syndrome. Through medical management including high-dose steroids and antihypertensive medications, the patient's blood pressure normalized, and he was eventually discharged home without further complications.
Iatrogenic Radial Arteriovenous Fistula Secondary to Transradial Coronary Angiography: A Case Report
Authors: V. Satish Kumar Rao , Bhyravavajhala Srinivas , Narayanan Ramakrishna , Yerram Sreekanth
Published: March 2020

Transradial access is the commonly followed route for performing percutaneous coronary diagnostic and angioplasty interventions. Transradial access has drastically decreased the vascular access site complications when compared with the transfemoral access. Arteriovenous fistula developing at the transradial access site is one of the rare complications. The risk factors and the mechanism of development are not entirely known. We present a rare case of a 63-year-old female developing radiocephalic fistula a few days after transradial coronary angiography and discuss management.

The transradial route is preferred for cardiovascular interventions. Complications arising out of this are rare even though this route is widely used. Arteriovenous fistula is one of the rare complications, and the mechanisms causing it are not always clearly evident. This report will elaborate on the possible causes and steps to prevent this complication and help in managing once it occurs.
Feasibility study of a compact heavy ion source for investigation of laboratory magnetospheric plasma
Authors: Nakamura K. , Nishiura M. , Okamura M. , Kanesue T. , Ikeda S. , Cannavo A.
Published: March 2020

We are developing a laser ion source to provide a high brightness multi-charged heavy ion beam as a part of the heavy ion beam probe system, which will be used to diagnose plasma potential in the Ring Trap 1 device at the University of Tokyo. As a probe beam, Nb2+ was selected, and a detailed laser irradiation condition was explored. It was found that the laser power density of 1.2 × 109 W/cm2 gives the maximum particle number of Nb2+ per laser energy from a niobium foil target. Essential ablation plasma parameters to design the laser ion source were also obtained. The expected beam current was more than 12 mA/cm2, with a pulse width of 3.1 µs at 200 mm away from the target.