bluuebunny/crossref_metadata_2025 huggingface dataset:
Convective Boundary Layer Flow of Magnetic Nanofluids under the Influence of Geothermal Viscosity
Authors: Ram Paras , Joshi Vimal Kumar , Makinde Oluwole Daniel , Kumar Anil
Published: September 2018

The purpose of the present study is to examine the effects of geothermal viscosity on an unsteady flow of incompressible magnetic nanofluids (C1-20B & Taiho-W40) due to a heated rotating disk. The modeled system of nonlinear coupled partial differential equations governing the unsteady flow together with the two point variable boundary conditions have been transformed into the set of non-linear coupled ordinary differential equations. The resultant set of equations is then solved by fourth order Runge-Kutta method in MATLAB using ODE45 with shooting technique for initial guess. The influences of geothermal viscosity variations ( for temperature & for depth) along with the ferro-hydro-dynamic (FHD) interaction parameter and rotational parameter R on the flow and temperature field generated on the plate surface are elucidated. Besides the above profiles; effects of both, depth and temperature dependent viscosity parameters are also examined on the skin frictions, rate of heat transfer and boundary layer displacement thickness. The computed results for stronger (C1-20B) and weaker (Taiho-W40) convective magnetic nanofluids (MNF) have been discussed and compared vis-a-vis.
Buoyancy Effects on MHD Unsteady Convection of a Radiating Chemically Reacting Fluid Past a Moving Porous Vertical Plate in a Binary Mixture
Authors: Sharma Ram Prakash , Makinde Oluwole Daniel , Animasaun Isaac Lare
Published: September 2018

In this paper, the problem of unsteady magnetohydrodynamic free convective flow with thermal radiation and chemical reaction past a porous vertical plate moving through a binary mixture in an optically thin environment is investigated. The viscosity of the fluid is assumed to vary linearly with temperature. Due to the nature of corresponding dimensionless variable for temperature and its boundary condition as in the case of binary mixture, Boussinesq approximation and temperature dependent viscosity model were modified. The governing boundary layer equations are transformed using suitable similarity transformation and solved numerically. A parametric study of selected parameters is conducted and results for velocity, temperature, concentration, local skin friction coefficient, local Nusselt number and local Sherwood number are illustrated and physical aspects of the problem are discussed. Increasing the temperature dependent variable fluid viscosity leads to increase in the velocity of the fluid and heat transfer rate at the surface when Grashof related parameters are greater than one-tenth.
Effects of Hall Current on Transient Flow of Dusty Fluid with Nonlinear Radiation Past a Convectively Heated Stretching Plate
Authors: Gireesha Bijjanal Jayanna , Mahanthesh B. , Makinde Oluwole Daniel , Muhammad Taseer
Published: September 2018

Influence of Hall current on flow and heat transfer of dusty fluid over a convectively heated stretching plate in the presence of nonlinear thermal radiation is explored in this paper. The unsteadiness in the flow and temperature fields is because of the time-dependent stretching velocity and surface temperature. Suitable similarity transformations are used to convert the governing partial differential equations of momentum and thermal energy to a system of nonlinear ordinary differential equations. Consequent equations are solved by using shooting method. The details of the velocities, temperatures, local Nusselt number as well as local skin friction for various parameters such as unsteadiness parameter, thermal radiation, Hall effects, Biot number, Eckert number, Prandtl number and magnetic parameter are presented graphically and discussed in detail.
Impact of Lorentz Force on Unsteady Bio Convective Flow of Carreau Fluid across a Variable Thickness Sheet with Non-Fourier Heat Flux Model
Authors: Anantha Kumar Kempannagari , Ramadevi Bujula , Sugunamma Vangala
Published: September 2018

In this article, we examined the magnetohydrodynamic Cattaneo-Christov bio convective flow of Carreau liquid over a variable thickness sheet with irregular heat sink/source. The fluid motion is supposed to be time dependent and not turbulent. Firstly, proper transmutations are pondered to metamorphose the basic flow equations as ODE. The solution of these ODEs is procured by the sequential execution of R.K. and Shooting numerical treatments. The density of motile organisms, concentration, temperature and velocity distributions for dissimilar values of non-dimensional parameters are perused via graphs. Further, we analyzed the impact of same parameters on friction factor, local Nusselt number and the rate of mass transfer coefficients and presented in table. Results indicate that the distribution of the density of motile organisms is an increasing function of Peclet and Lewis numbers. Fluid velocity is proportional to the Weissenberg number. Also the space dependent heat sink/source parameters perform obligatory role in the mass and heat transport performance.
Non Linear Radiative Flow of a Micropolar Nanofluid through a Vertical Channel with Porous Collapsible Walls
Authors: Sarojamma G. , Lakshmi R.V. , Narayana P.V. Satya , Makinde Oluwole Daniel
Published: September 2018

In this paper we discuss the MHD unsteady flow of a micropolar nanofluid through a vertical channel with expanding/contracting walls under the influence of nonlinear thermal radiation considering weak permeability. The PDEs of the governing problem are reduced into a set of ODEs by using self-similar transformations and are then solved numerically. Influence of flow parameters such as wall dilation ratio, permeability Reynolds number, micropolar parameters, thermal radiation parameter, nanofluid parameters etc. on the flow, thermal energy and volume fraction of nanoparticles has been discussed in detail. We trust that the results of this study are not only useful for industrial applications but also present a basic understanding of the physical model.
Soret and Dufour Effect on MHD Jeffrey Nanofluid Flow towards a Stretching Cylinder with Triple Stratification, Radiation and Slip
Authors: Jagan K. , Sivasankaran S. , Bhuvaneswari Marimuthu , Rajan S. , Makinde Oluwole Daniel
Published: September 2018

In this paper investigation is done on the MHD Jeffrey nanofluid flow towards a stretching cylinder in the presence of non-linear thermal radiation, triple stratification, Soret and Dufour and slip. The governing equations are transformed into ordinary differential equations by using suitable transformations. The HAM method is used to solve these equations. The temperature profile and local Sherwood number increase when Dufour number is hiked where as local Nusselt number fall off. While increasing local Soret number, the concentration profile increases where as Sherwood number decreases.
Transient Magneto-Squeezing Flow of NaCl-CNP Nanofluid over a Sensor Surface Inspired by Temperature Dependent Viscosity
Authors: Nayak Manoj Kumar , Bhatti M. Mubashir , Makinde Oluwole Daniel , Akbar Noreen Sher
Published: September 2018

Present study is to a great extent explains the time dependent squeezing magneto-hydrodynamic flow of Sodium Cloride-Carbon nanopowder nanofluid past a sensor surface. The current study is all about the influence of temperature dependent viscosity represented by Reynolds model and Vogel’s model on the MHD flow of the nanofluid considered. Successive Taylor series linearization method has been implemented in order to obtain the numerical solution of the transformed non-linear governing equations. It is very important to mention that irrespective of whether it is NaCl-Graphite or NaCl-Carbon Black or NaCl-Carbon nanopowder, the presence of magnetic field strength contributes the impede movement of the fluid while enhancement in the volume fraction, Reynolds model and Vogel’s model viscosity parameters exhibit the diametrically opposite trend. Keywords: NaCl-CNP nanofluid; MHD; Variable viscosity; Unsteady Squeeze flow; Sensor surface.
Two-Phase Flow of Dusty Casson Fluid with Cattaneo-Christov Heat Flux and Heat Source Past a Cone, Wedge and Plate
Authors: Mahanthesh B. , Makinde Oluwole Daniel , Gireesha Bijjanal Jayanna , Krupalakshmi Koneri L. , Animasaun Isaac Lare
Published: September 2018

This article addresses the boundary layer flow and heat transfer in Casson fluid submerged with dust particles over three different geometries (vertical cone, wedge and plate). The aspects of Cattaneo-Christov heat flux and exponential space-based heat source (ESHS) are also accounted. At first, the partial differential equations are transformed into a set of ordinary differential equations via appropriate similarity transformations. Resulting equations are solved via shooting method coupled with the Runge-Kutta-Fehlberg-45 integration scheme. The consequences of dimensionless parameters on velocity and temperature fields of both fluid and dust particles phase are analyzed. The rate of increment/decrement in the skin friction as well as the Nusselt number for various values of physical parameters are also estimated via slope of linear regression line using data points.
Transient Rotational Flow of Radiative Nanofluids over an Impermeable Riga Plate with Variable Properties
Authors: Shaw Sachin , Nayak Manoj Kumar , Makinde Oluwole Daniel
Published: September 2018

The present investigation imparts an analysis on the effect of time-varying rotation and thermal radiation on diversified nanofluids possessing water as base fluid and Magnetite , Cupper Oxide (CuO), and Titania (TiO) as nanoparticles. Variable fluid properties such as variable viscosity and variable thermal conductivity are taken into consideration. Ensuring implementation, Successive Relaxation method is the instrumental in obtaining the most appropriate numerical solution of the transformed differential equations. One of the marvel outcomes of the current study is that moderate rotation reduces the axial and transverse wall shear stresses and augments the heat transfer rate while higher rotation exhibits the reverse trend for Water-Magnetite, Water-Cupper Oxide, Water-Titania nanofluids.
Agentless Water Disinfection by Electrophysical Method
Authors: Bulat Anatoly D. , Filenkov Vladimir M. , Seleznev Vladimir A. , Lushkin Igor A.
Published: September 2018

The problems of increasing the efficiency of water disinfection by means of nature-friendly technologies that can restore the balance between the biosphere and the technosphere disturbed by man are considered. For this purpose, it is proposed to use the aspects of thunderstorm activity as a promising technology for cleaning and disinfecting the air-water basin of the Earth. Based on the principles of similarity and analogy methods, it is proposed to implement a method of electrophysical influence on water, by means of a device for producing electromagnetic fields in the regime of vortex-wave resonance. The force action of crossed electromagnetic fields on the bacterial cell, at a certain level of field strength, will lead to its lysis. In addition, the dispersion of various inclusions, clusters and water molecules, allows the saturation of water with ions of oxygen and hydroxyl groups, and, consequently, its disinfection.
Modern Condition of Dose Loads from Construction Materials and Main Sources of Ionizing Impact on the Population of the Volgograd Region
Authors: Mikhnev Ilya P. , Salnikova Natalia A. , Lempert M.B.
Published: September 2018

The article is devoted to the problems of the construction ecology. Studies of the gamma background are presented in residential, public and industrial premises constructed from various building materials. Methods are developed to protect population from the influence of natural radionuclides.
System of Warning about Dangerous Atmospheric Phenomena in the North Caucasus for Objects of Economic Activity
Authors: Shapovalov Vitaliy A.
Published: September 2018

This paper presents the developed program-mathematical software for receiving, archiving, analysis and display of radar, lightning and satellite data on clouds and precipitation, interfacing of meteorological information. The program of processing of meteorological information "GIMET-2010" is established on a network of weather radars DMRL-C of the Russian Federation. An automated system combining radar and lightning detection system information applies to the command posts of the uniformed services on the fight against hail and centers of severe storm warning. Following items are provided: a receiving and transmitting to consumers the operational radar data on the actual weather; the detection, identification, and warning of hazardous weather phenomena for airports and populated areas; measurement of the intensity and amount of precipitation for agriculture, hydrological forecasts and land reclamation; obtaining precipitation map for agriculture and insurance companies.
The Statistical Forecasting Models of a Hail for the Western Part of the North Caucasus and the Black Sea Coast Constructed on Output Production of Global System of Forecasts (GFS NCEP)
Authors: Kagermazov Arthur Kh.
Published: September 2018

Statistical models of the hail forecast are proposed for the two regions of the North Caucasus, developed from the output of the global atmosphere model GFS NCEP. Statistical schemes are obtained as a result of discriminant analysis conducted using statistical software package SPSS. Independent variables in these schemes are the most informative predictors of strong convective cloud development, calculated on the basis of the global GFS model data related to local atmospheric instability and large-scale synoptic processes. Based on the results of the operational audit, the estimates of the success of the hail forecasts according to existing criteria are given, the high values of which assume a reduction in damage from hailstorms, when using them.
Integrated Assessment of Exogenic Processes Potential Threat to Facilities Located on the Territory of Recreation Centre "Polyana Cheget" (Elbrus Region, Caucasus)
Authors: Dokukin Michail D. , Kalov Ruslan Kh.
Published: September 2018

Integrated assessment of snow avalanches, glacial mudflows, outburst floods and rock avalanches to facilities located on the territory of Recreation centre "Polyana Cheget", based on geomorphological analysis, interpretation of multi-temporal aerial and satellite images as well as route surveys has been presented in the article.
Environmental Aspects of Natural and Climatic Changes in the Elbrus Region (Kabardino-Balkar Republic)
Authors: Kalov Ruslan Kh. , Kalov Khazhbara M. , Kesheva Lara A.
Published: September 2018

Ecological problems, exogenous processes and phenomena in conditions of climate warming in the Elbrus region (the North Caucasus, Kabardino-Balkar Republic) are reviewed in this article. Increase of average-annual values of temperature and amount of precipitation within the period of 1961-2017 and sub-period of intensive warming of 1976-2017, acceleration of dynamics of glaciers recession in Elbrus, activation of exogenous processes in the Elbrus region are established on the basis of the meteorological data analysis (temperature and precipitation) and monitoring of glaciers degradation.
The Brine Mineralization Processes Dynamics Investigation of the Bolshoi Tambukan Lake
Authors: Adzhiev Anatoly Kh. , Khuchunaev Buzigit M. , Kanametova Fatima E.
Published: September 2018

The analysis of the water-salt balance data in the Bolshoi Tambukan lake within the period 1972-2015 is performed. The regression equation of the therapeutic mud concentration mineralization correlation in the lake with water volume is received. The tendency of minerals concentration reduction in the lake for the last years has been revealed.
Analysis and Evaluation of Financial Resources of Social Housing Construction in City
Authors: Maleeva Tatyana V. , Selyutina Larisa G.
Published: September 2018

Cities in Russia including St. Petersburg lack of social housing. The state measures involving financial budget support to families have appeared ineffective to solve the problem. Currently, over 170 thousand families in St. Petersburg need to improve their housing conditions. The paper considers alternative financial resources of social housing construction. The paper analyzes the first experience of rental housing, constructed due to budget finances. The social housing construction with private investment resources is proven. The authors suggest the way how regional authorities can effectively stimulate private investors to construct social rental blocks of flats.
The Problem of Exceeding the Cost of Construction and New Opportunities to Solve it at the Stage of Project Preparation
Authors: Oparin Sergey G.
Published: September 2018

The article discusses the problem of exceeding the planned cost of construction, sources of origin and ways to manage the risk of the need for additional financing of construction at the stage of project preparation. The possibilities of solving the problem by substantiating the reserve funds for unforeseen works and costs on the basis of the process approach and the digital model of distributed risk assessment are considered. In order to improve the reliability of determining the cost of construction, the dependence of the reserve funds for unforeseen works and costs, risk cost and risk degree is determined. An example is given of substantiating the reserve funds for unforeseen works and costs in the composition of the summary budget calculation of capital repair of the 1st Yelagin bridge over the Srednyaya Nevka river in Saint-Petersburg taking into account project design, production, technology, pricing, contractual and inflationary risk factors.
An Assessment of the Potential for Growth and Development in the Construction Industry
Authors: Chepachenko Nikolay V. , Leontiev Alexander A. , Uraev Grigorii A.
Published: September 2018

For the purpose of productive research and management of the new quality economical growth potential building process in the construction industry, it is necessary to distinguish between quantitative and qualitative indicators of the growth of its economy, which entailed the necessity to search for a solution to the problem of justifying the measurement method and assessing the quality of its economy growth in correlation with the justification of a measurement method and assessing the potential for quality growth and economic development of the industry. To solve this problem, the principles and recommended attributes of identifying the processes of growth and development of the construction industry have been substantiated, which allowed substantiating methods for assessing the potential for economical growth in the construction industry and its economic development through the use of resources and structural methodological approaches. For the quantitative assessment of the economical quality growth potential in the economy of the construction industry and its economic entities, a resource approach has been recommended that allows to determine the magnitude of the change in the planned (actual) economic effect for the estimated period analyzed as a result of the effectiveness of employing labor, material and financial resources in the valuation for real cost and a structural approach was recommended to justify the assessment of the economic development potential of the industry. The developed methods for measuring and assessing the potential for growth in the economy of new quality and economic development of the construction industry are recommended to be applied in the process of measuring, planning, analyzing, assessing and monitoring the level of use of resource and innovation potential in the activities of construction organizations and their economic agents with similar parameters in terms of sector and region.
Development of Methods of Assessing the Land Market Value
Authors: Kolankov Sergey V. , Voronova Svenlana P. , Golikova Ulia A.
Published: September 2018

This article discusses methods for assessing the market value of land plots used in a comparative and income approaches. The comparative approach includes the sales comparison approach, the method of allocation and the method of distribution. The income approach includes the method of capitalization of land rent, the balance (residual) method and the method of intended use. The work analyzes the content of normative legal acts used to determine the market value of this type of property. Basically this is the provisions of the Guidelines (methodological recommendations) for determining the market value of land plots. As a result of the analysis, the authors suggest the main directions for the development of existing methods used in valuation activities.
Factor Interrelation System of Integrated Business Structure Development in Construction
Authors: Alexeenko Vera V. , Seredina Nika S.
Published: September 2018

One of the key objectives of the formation and development of integrated business structures in Russia is to meet the population's need for new housing. Qualitative and quantitative indicators of residential building commissioning are significantly influenced by demand and supply factors. With the purpose of forecasting the activity of demand in the housing market with the help of methods of economic and mathematical modeling, the interrelation system of factors forming the socio-economic basis for the development of integrated business structures in construction has been built. The formulated economic and mathematical model allowed us to identify the factors focused on the formation of rational relations between the subjects of the housing and construction cluster. The model shows that the effectiveness of the mortgage lending system (from the demand side) and the level of introduction of innovations in the investment and construction complex (from the supply side) have a decisive influence on the solution of the housing problem.
Housing Construction and Economic Dynamics in Largest Cities of Russia
Authors: Mirgorodskaya Elena O. , Sukhinin Sergey A.
Published: September 2018

This article analyzes spatial differences and tendencies of development of housing construction in largest cities of Russia. The authors estimate the pace of housing and housing provision in the largest cities of Russia. Based on a comparative analysis cities with different levels of housing development are identified. The authors define the interaction and interdependence of housing construction and economic development of Russia's largest cities.
The Tourist Directions Resources and Sustainable Development Competitive Advantage Marketing Model in the North Caucasus
Authors: Danilova-Volkovskaya Galina M. , Koval L.N. , Babchenko A.P. , Volkovskiy N.N.
Published: September 2018

The process of managing the territorial brand has been analysed, the quadrangular model of competitive advantage of tourist destinations in the North Caucasus regions has been designed.
Competitive Environment Assessment and the Contractor Selection Criteria for the State and Municipal Contracts Execution
Authors: Filippova Tatiana Y. , Kuzovleva Irina A.
Published: September 2018

The article deals with the competitive environment assessment in the investment and construction complex and specifics of the contract system implementation in the procurement of goods, works and services provided for state and municipal institutions. Being a key element in the state construction order implementation and assessing the level of competitiveness of the investment and construction complex enterprises, the contractual bidding mechanism acts as the basis for competitive relations, simultaneously legislating the main price criteria for the selection of contractors, which do not allow to objectively evaluate the applicants' ability to fulfill the conditions of the concluded contract in full.
Improvement of Engineering Accounting and Control System in Construction on the Basis of Accounting Engineering Tools
Authors: Shumeyko Marina V. , Sagamonova Galina V. , Sagamonova E.V.
Published: September 2018

The article describes the prerequisites and possibilities of creation of a microeconomic platform of the digital economy in the construction industry. The chronology of development and improvement of mechanisms and methods of accounting is given. The article presents a system of mechanisms of accounting engineering and management of economic processes, developed by the authors.
The Development of Public-Private Partnerships in Russia
Authors: Sagamonova Galina V. , Shumeyko Marina V. , Sagamonova E.V.
Published: September 2018

The article makes a study of the development of public-private partnerships (PPPs) in Russia in the implementation of investment projects. The article considers the current state of PPPs, the main problems and development trends. Particular attention is paid to potential risks for public and private partners. The paper proposes the recommendations for the main directions of PPPs development.
The Residential Real Estate Market Influence on the Reconstruction and Housing Restoration Potential in the Region
Authors: Sevka Victoria G. , Panchenko Viktoriya V. , Kilimnik Elena A.
Published: September 2018

The article aims to research the housing state of Donetsk. The market sales and market purchase have been analysed. The main problems of the residential real estate market has been revealed. The necessity in restoration of housing has been determined by means of primary measures. These measures are directed to stabilise the market situation and to improve the life quality.
The Mechanism for Managing the Business Potential of Commercial Real Estate Projects
Authors: Tsopa Natalia V. , Kovalskaya Lubov S. , Malachova Victoria V.
Published: September 2018

The article considers issues related to the development and justification of recommendations for improving the mechanism for managing the business potential of commercial real estate projects in accordance with the current conditions of a changing market environment. Proposed criteria for assessing the quality factors of the commercial real estate projects. The implementation of the mechanism for managing the business potential of commercial real estate projects on the example of the trade & office center project is considered.
Economy of Construction: Modern Trends, Management Decisions Modelling
Authors: Miroshnikova Tatyana K. , Taskaeva Natalia N.
Published: September 2018

The economic and multiplier effect of the construction industry is considered. The features of the construction industry are investigated. Proposals are formulated to improve the return on investment in construction. The development of construction can become a very important element not only to diversify the Russian economy, but also to ensure a balanced development of Russian regions, in particular Primorsky Krai, which has direct transport links with countries in the Asia-Pacific region that has the necessary potential. The authors developed methodological provisions for substantiating management decisions based on the material balance of the construction complex. Application to the development of the management solution of the system approach and the proposed model for the formation of a management solution ensuring integrity, successive stages in the formation of a management decision for the balanced provision of the construction complex with material resources are considered.
Infographic Modeling of the Functioning of Public-Private Partnership in the Activity of Information and Technological Services in Construction
Authors: Chulkov Vitaliy O. , Chulkov Georgy O. , Losev Konstantin Yu.
Published: September 2018

Public private partnerships (PPP) consider interaction on mutually beneficial terms of the state and private entrepreneurship (as a form of business) for solving socially significant tasks. Different specialists consider PPP in different ways. In the field of information technology services in construction the basis for PPP is the following: ● The parties to such a partnership are the state and private business; ● the interaction of the parties is enshrined on an official legal contractual basis, it is of an equal nature and clearly expressed social orientation; ● the parties consolidate resources and deposits, allocate financial risks, costs and expected results in strictly defined proportions between the parties in the concluded contracts beforehand on the basis of PPP. The success of PPP objectives is facilitated by: ● political will; ● regulatory framework; ● the emergence of projects that encourage private business to create opportunities for their implementation. The article deals with visual-figurative (infographic) modeling, which facilitates the decisions adoption at the stage of interaction formation between the parties of PPP.
Structurally-Parametrical Optimization Technological Process by Dijkstra's Method in System Mathcad
Authors: Kudryavtsev Yevgeniy M.
Published: September 2018

The article describes the procedure of structurally-parametrical optimization of technological process by Dijkstra's method with using of Dijkstra’s functional (recurrent) equation and Mathcad system. The technological process includes n of operations and each operation can be executed by various types of equipment. Expenses (cost, time, ...) on execution of i operation by k equipment after execution by j equipment (i-1) operation are known - c (i, j, k).
The algorithm of the decision of a problem by Dijkstra’s method includes two phases. The first phase is calculations of the minimum expenses for execution of all partial technological processes, from first operation of process to the last. The second phase is definition of the required optimum set of equipment which is carrying out all technological process with the minimum expenses from last operation of process to the first.
The proposed procedure of structurally-parametrical optimization of technological process using Dijkstra’s method and Mathcad software significantly decreases time and labour costs on execution of such calculations and efficiently to execute investigations related with change of equipment parameters.
Optimum Order Management of Building Structures in Panel Building
Authors: Kuleshov Igor V. , Pishchukhin Aleksandr M.
Published: September 2018

The study is devoted to the development of an algorithm for the optimal management of the volumes of orders for various building structures and their stock in the warehouse of a construction site. The state of the warehouse is described by a first-order differential equation, the functional is compiled using Prof. Letov's method of analytical construction of optimal regulators (ACOR), the solution is carried out by the Euler-Lagrange method. Based on previous studies of the optimal number of links in the construction team, the optimal dependences of the volumes of orders and stocks on the time of installation of the panel building have been obtained. As a result, it was found that all the dependencies show a monotonous tendency to zero as they approach the end of installation, increasing the intensity of installation increases the volume of orders and reduces the concavity of the stock schedule, increasing the contribution of order quantities in the functional increases both of these parameters.
Organization of Reconstruction Works of Buildings and Structures after Disasters
Authors: Grigoryan Vardges I. , Tadevosyan Natalya N.
Published: September 2018

The article refers to the measures for stage by stage restoration of buildings and structures damaged after both natural and man-made disasters. The work also includes war situations, which according to experts are equivalent to natural disasters. Taking into account the diversity of areas, their geological differences and measures, in each case, localization adjustment is implied. In unpredictable situations such as natural disaster, war operations, restoration of buildings and the organization of tightening works are carried out using the latest methods and technologies. To provide stability of the main frame with strengthening of stone and concrete walls, we suggest strengthening various structures with the method of “sewing of cracks” and using implementation of concrete and asphalt-concrete coatings in the damaged area.
Optimization of Construction Operations at Reduced Resource Intensity and Labor Costs
Authors: Tsapko Konstantin A. , Alyaeva Marina Y.
Published: September 2018

The article deals with the method of cost optimization in the construction of objects for various purposes. The existing opportunities of optimization of expenses of the budget investments in objects of capital construction are analyzed. Particular attention is paid to improving the efficiency of the funds use in the various works performance, it is proposed to use the hidden opportunities and reserves of the company, receive a positive opinion of the state expertise, as well as expand the powers of planning and spending funds in capital construction. The functions of the office focused on its efforts on crucial, vital internal and external activities.
Problem Aspects of Organizing the Process of Strategy Implementation of a Construction Company
Authors: Vetrova Natalya M. , Ryvkina Olga L. , Gaisarova Anastasia A.
Published: September 2018

Relevance of research of construction company’s strategy implementation process is determined by the necessity to improve its competitiveness in conditions of instability and changes. The aim of the research is to specify the problematic aspects of a special stage of strategic management – the stage of strategy implementation. As a result, the following system of managerial actions and procedures for the strategy implementation process of a construction company was justified: creation of organizational conditions (changing the organizational structure and organizational culture of a construction company, system of motivation, staff competencies and management style); adjustment of a company's management system for achieving its strategic goals and objectives; creation of a special system for monitoring the process of strategy implementation; formation of a mechanism for adaptation of a strategy and / or external and internal environment of a construction company to achieve its strategic goals.
Increasing the Level of Construction Safety by Using the Protective and Catching Systems
Authors: Kuzhin Marat F. , Grezeva Anastasia S. , Kochergina Olga D.
Published: September 2018

Increasing the level of production safety is one of the most important tasks in construction. One of the most common dangerous production factors is the drop of objects from the building, as well as the fall of workers from the installation horizon. An effective way to solve this problem is to use protective-catching systems that prevent falling objects from the installation horizon to the construction site. However, these systems have certain limitations in the field of application, incl. restrictions on the weight of the falling elements, and also an effective application zone. Another drawback is the technological features of the application of the system, incl. the need for periodic re-installation of systems following the installation horizon, as well as the laboriousness of work on the installation of systems. The study of technological and organizational features of the systems will increase the effectiveness of their application.
Integrated Quality Index of Organizational and Technological Solutions for Implementation of Burundian Capital Master Plan
Authors: Lapidus Azariy A. , Yves Ndayiragije
Published: September 2018

Construction project involves a complex array of specific interdependent activities, undertaken by multiple participants with contradictions of interests. It has phases to follow in its life cycle to meet the project’s objectives. Each phase will typically have multiple sub-phases and processes. The choice of technological and organizational solutions is carried out in the planning and design phase. Changes affecting any task (or the need to resolve conflicting elements of two or more tasks) can have a significant knock-on effect on the project’s success, regardless of the phase of the life cycle. This paper intends to develop an integral model of organizational and technological solutions, which allows to choose the optimal criteria for Burundian capital master plan as well as monitoring the quality of their implementation.
Damper as a Rigid Insert for Rigid Bus Structures Oscillation Damping
Authors: Fomenko Serafim A. , Garanzha Igor M. , Tanasoglo Anton V.
Published: September 2018

One of the main problems in a design of rigid bus structures in open switchgears devices is a structural stabilization under the influence of various dynamic loads. The implementation of rigid bus structures with large spans of pipe-bus showed a real danger of the wind resonance for cylindrical pipe-bus structures (aeroelastic oscillations). This phenomenon is dangerous in that at low wind speeds there are intense pipe's oscillations in vertical plane, adding to the static loads an essential dynamic component. Its level is comparable with the loads from the weight of the structures and can, in combination with the rest loads, cause stresses close to the maximum admissible for the 1st group of limit states. The problem of reducing the level of structural oscillations in many cases is associated with the need to increase the rigidity and reduce the material consumption, but it's important to meet the technological requirements imposed by operating conditions and protect people from harmful vibration. In a paper are considering a new method for damping oscillations for rigid bus structures under the action of a wind vortex excitation – damper as a rigid insert. Is presented a mathematical model of the joint work of the rigid bus structure with the damper as the rigid insert. Have carried out analytical researches of the joint work of the rigid bus structure with the damper as the rigid insert.
Modeling of the Building by Numerical Methods at Assessment of the Technical Condition of Structures
Authors: Degtyarev George V. , Belokur Kirill A. , Sokolova Irina V.
Published: September 2018

Assessment of technical condition of the building by creation of calculated model with application of the multipurpose program complex «Stark ES» of the version of 2018 is made.
Conditions of Maximum Economic Efficiency and Environmental Safety of Reinforced Concrete Columns with Precompressed Reinforcement
Authors: Mailyan Dmitry R. , Mailyan Liya D.
Published: September 2018

The efficiency of reinforced concrete columns with precompressed reinforcement is shown. It was proved that in the elements with mixed reinforcement, up to 50% from the total steel consumption can be economized.
Stress and Strain Intensity Factors of the Corner Area of the Structure Boundary
Authors: Frishter Lyudmila U.
Published: September 2018

The Stress and strain state of building structures in zones with bird's mouths and cuts of the boundary is characterized by stress concentration zones emergence and requires an evaluation of strength and reliability of objects, which is the engineering practice actual task. Theoretical analysis of stress and strain state of bird's mouth areas of the region boundary is confined to the study of singular solutions of the elasticity problem with power singularities. In this case, the concept of stress or strain concentration at an irregular point of the region boundary becomes meaningless. In the present article, stress and strain state is considered in the neighborhood of the bird's mouth vertex of the boundary of a plane region, which is written with the help of the intensity factors. Two approaches are given to obtaining the expressions for displacements, stresses in the neighborhoods of an irregular point of the boundary of a plane region by means of stress intensity factors and strain intensity factors. The difference in the expressions for stresses and displacements obtained for the limiting values of stresses and strains determines the practical significance of the work during the experiments and the determination of the critical values of stresses and strains.
The Ways to Reduce the Materials Consumption of Compressed Reinforced Concrete Elements
Authors: Muradyan Viktor Arutyunovich
Published: September 2018

The article deals with the main advantages of reinforced concrete columns with recessed fittings. The method of testing the prototype columns is described. In addition, the influence of various factors on the fracture pattern and bearing capacity of such columns is explained. The standard reinforced concrete columns are given below and the optimal parameters for saving reinforcing steel are observed [1-7].
Durability of Buildings in Urban Environment
Authors: Varlamov Andrei A. , Rimshin Vladimir I. , Tverskoi Sergei Y.
Published: September 2018

The longevity forecast is proposed to be implemented on the basis of models of degradation theory. The theory of degradation is developed as a general energy method for estimating the longevity of objects. It is based on the law of conservation of energy. To analyze the longevity of urban environment, it is proposed to adopt the simplest model of theory of degradation. The proposed work provides an explanation for the description of proposed model. The urban environment is divided into a number of simpler systems. The more the degree of system separation into simpler ones, the more accurately one can describe the behavior of the entire system in time. Each simple system is described by the simplest model of degradation theory. The general behavior of the system is understood as a simple sum of individual degradation models. A feature of the proposed theory is that the simplest model can describe the entire system or the sum of its individual parts at once. The model makes it possible to consider the issue of equalizing the longevity of individual systems. The analysis of durability of a multicompartment building is taken as an example. In terms of analyzing the given example, individual stages of systems operation, that are still subject to discussion, are identified.
Combined Way of Diagnostics of Reinforced Concrete Conical Structures
Authors: Romanenko Elena Yu. , Trubitsin Mikhail A.
Published: September 2018

Reinforced concrete conical structures are the basis of safety and operational reliability of railways power supply systems. The article presents optimal methods for diagnostics of reinforced concrete structures, which allow recommending the sequence and amount of repair work aimed at restoring or maintaining the required state of reinforced concrete conical section structures (contact-line supports, power transmission line supports, etc.). A design scheme is proposed for determining the residual bearing capacity of the support in the presence of cracks and corrosion of the reinforcement.
Analysis of the Stresses of the Wall of a Steel Water Tower
Authors: Skachkov Sergey V. , Shchutsky Sergei V.
Published: September 2018

We consider the calculation of the wall of a water tower in the form of a welded sheet structure, structurally consisting of a cylindrical vessel with a conical bottom and a roof and a cylindrical support. The creation of the finite element calculation model and determination of the stresses in the tower elements taking into account various features of design, installation and operation of the structure are performed. The questions of local stability of the wall in the joints of cylindrical and conical parts are considered. The necessity of arranging ribs in the conical part along the meridional directions and in the junction points - ring ribs is substantiated.
The Actual Comfort of Human Habitation in the Stationary Environment of a Dwelling at the Stage of its Operation
Authors: Chulkov Vitaliy O. , Chulkov Georgy O. , Losev Konstantin Yu. , Khashkhozhev Kazbek N.
Published: September 2018

The criteria for assessing the actual comfort of human habitation in the system "man-technology-environment" (MTE) and important components of integrated security in the society are numerical quantitative estimates of a particular person organism functioning characteristics in a specific environment of his specific production activity and / or vital activity using a specific technique. To assess the level of actual habitat comfort, it is necessary to develop composite models that provide the ability to diagnose, evaluate and correct the current numerical values of characteristics for human, engineering and habitat. The use invariant and specific characteristics, depending on the variety of the system under study and changes in the values of its other component characteristics, methods and tools for numerical evaluation of comfort is of great importance as well as to distinguish the level of comfort of living (in human life) or the functional state of the operator (in labor activity). The article examines an example of the survey and monitoring of the human habitation comfort in a construction site stationary environment.
Strengthening of Reinforced Concrete Beams by Carbon Fiber Composites
Authors: Ivanov Yuri V. , Rogatnev Yuri F. , Ushakov Igor I.
Published: September 2018

The paper considers the results of the experimental study of the reinforced concrete beams strengthened by carbon fiber reinforced plastics (the CFRP). Eight reinforced concrete beams of the 80x160 mm section and 1500 mm designed span have been manufactured and tested. The influence of the number of the CFRP layers (strengthening power) on bearing capacity and rigidity under the static loading of beams in the thirds of the span has been studied. The results obtained indicate the increase in bearing capacity of the reinforced beams from 24% up to 55% and the increase in rigidity by 45% for the commonly adopted limiting state, i.e. achieving ultimate deformations in concrete of the compressed zone). The paper underlines the need for using anchor devices in the form of U-shaped binders to ensure the efficiency of the given method of strengthening.
Multi-Purpose Forming System for Strengthening Structural Elements of Buildings and Works
Authors: Abramyan S.G. , Burlachenko Oleg V. , Oganesyan Oganes V.
Published: September 2018

The authors suggest a new forming system designed for strengthening certain structural elements, by means of widening, for the purpose of reconstruction of buildings and works. A prefabricated “transformer” decking is a versatile forming system, which can be arranged both as a three-dimensional closed P-structure and as a flat structure, depending on the purpose or type of a specific structural element to be strengthened and the work method to be employed. It is also technology intensive, requiring approximately 3-4 times less labor effort as compared to conventional small-panel forms used for reconstruction and overhaul of construction systems. The newly developed forming system is consistent with the environmental safety requirements, having a deck made of porous artificial wood instead of natural wood, as was previously substantiated by the authors’ calculations. Because porous artificial wood, having all the benefits of natural wood (i.e. ease of processing), is free of its drawbacks, a “transformer” form is flameproof and moisture resistant. Enhanced usability of such a forming system is achieved through the use of a material reliable in operation and easy for processing.