bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of casting direction on bond of reinforcement in High Performance Self-Compacting Concrete (HPSCC)
Authors: Dybeł Piotr
Published: January 2019

This paper presents the results of an investigation into the steel-to-concrete bond in high-performance self-compacting concrete (HPSCC) based on direct pull-out tests. Specifically, the effect of the casting direction on bond properties is examined. Two variants of concrete mixture casting were considered in this work: from the top and from the bottom of a mould with a single casting point at one edge. Horizontal specimens with transverse rebars distributed over their heights (480 mm) and lengths (1600 mm) were cast. The experimental program has shown that the direction of concreting plays an important role in the formation of the bond condition. In the case of casting a mixture from the bottom of a mould, in the lower part of a specimen there is no significant change of the bond stress. However, there is a strong improvement in the upper part. The phenomenon observed eliminates the top-bar effect. What is more, for the rebars situated in the upper part of a specimen, improvements in bond characteristics, such as the bond stiffness, bond strength and the effect of the rebar distance from the casting point are all observed in the case of casting a mixture from the bottom of a mould.
Multifunctionality of coatings made of polymer modified cementitious mortar
Authors: Francke Barbara , Sudoł Ewa , Wojnowski Damian
Published: January 2019

The paper analyses durability of typical waterproofing coatings and assesses their influence on concrete surface protection in their different functions – as carbonation resistance and resistance to chemicals . For this purpose, a polymer modified cementitious mortar product was chosen for tests, one representative in its class and with properties typical for this group of materials. The tests were performed both using standard methods and methods of own design. The results presented in this article confirm that it is possible to develop a composition of a polymer modified cementitious mortar product which ensures creation of an effective and durable coating which serves as a waterproofing layer, chemical protection layer – in a limited scope, naturally – and surface protection against concrete carbonation.
Concrete reinforced with various amounts of steel fibers reclaimed from end-of-life tires
Authors: Pająk Małgorzata
Published: January 2019

The main objective of the paper was to provide more information about the influence of fibers coming from the end-of-life tires on the behaviour of concrete. Because of their untypical geometrical characteristic they are not eagerly applied as concrete reinforcement. Considering the amount of used tires, the management of this waste would he beneficial for the environment. The paper deals with the typical floor concrete reinforced with three dosages of fibers equal to: 30kg/m3, 40kg/m3 and 60kg/m3. The compressive and flexural mechanical parameters of RSFC were studied. The waste fibers with the shape dissimilar to manufactured fibers did not have a negative effect on the properties of the mix in a fresh state. The compressive strength was slightly affected by the fibers, meanwhile the pronounced influence of RSF on the post-peak flexural parameters was noted. Those parameters increased proportionally with the amount of fibers. However, the scatters in the flexural tests results were increasing with the fibers content. The investigations indicate that the fibers from the end-of-life tires could he applied as a concrete reinforcement. The values of flexural parameters which can be further applied to structural calculations were shown.
The impact of the quality of materials on the differentiation of the reliability of a reinforced concrete beam
Authors: Skrzypczak Izabela , Buda-Ożóg Lidia , Kujda Joanna
Published: January 2019

Eurocod PN-EN 1990 „The basis for structural design” includes general principles for the differentiation of reliability taking into account the consequences of failure. Constructions are classified into three reliability classes RC1 to RC3, for which target reliability indicators have been defined. For the RC2 reliability class the basic values of partial coefficients in relation to materials and loads for persistent and transient computational situations were given. However, Eurocod PN-EN 1992-1-1, „Design concrete structures”, proposes to reduce partial coefficients by including quality control of production and available information on the heterogeneity of the materials used. The evaluation of standard recommendations regarding material partial coefficients was made on the basis of analysis of the reinforced concrete bending beam. The standard recommendations provide different levels of reliability. Elements designed in accordance with EN 1992-1-1 to reduce the value of partial factors with tighter quality control and reliability of reinforced concrete elements at RC2 reliability level may not be sufficient for load factors more than 0. 4.
Influence of variability of water content in different states on electromagnetic waves parameters affecting accuracy of GPR measurements of asphalt and concrete pavements
Authors: Wutke Małgorzata , Lejzerowicz Anna , Jackiewicz-Rek Wioletta , Garbacz Andrzej
Published: January 2019

In the paper a water content effect in various states on the variability of the electromagnetic waves parameters is discussed. This variation can affect accuracy and repeatability of asphalt and concrete pavement thickness estimation with GPR method. In case of asphalt pavements, tests were carried out using the air-coupled 1.0 GHz antenna and included three approaches: two on asphalt road and one of asphalt slabs. In the case of concrete slabs, tests were carried out using a ground-coupled 1.6 GHz antenna on two slabs: reinforced and unreinforced. A high variability of the electromagnetic wave parameters was observed depending on moisture conditions. The increase in the humidity of the medium causes a reduction in the propagation speed of the electromagnetic wave (increasing the dielectric constant of the medium), increasing of waves time propagation, decreasing of reflection amplitude and increasing of frequency attenuation, which should be considered when determining the thicknesses of the construction layers. Studies showed that not always higher air humidity, atmospheric precipitation and consequently wet surface indicate a higher dielectric constant of the medium. It can be concluded that not only the humidity and ambient temperature affect the change in the dielectric constant, but also other factors not resulting from the construction of the pavement as well as material microstructure.
Risk Factors in a Process of Gas Supply Pipeline Construcion
Authors: Kosmalski Sebastian , Myrczek Józef
Published: January 2019

The paper applies to the risk management in the specialized construction by the example of construction of a high-pressure gas supply pipeline. The specific character of the construction project has an impact on the scope and types of risks which may occur and adversely affect the outcome of the project. The paper aims to indicate the groups of technological tasks which need to be carried out when constructing a gas supply pipeline, the associated factor risks and the quality control method as a tool of mitigating the level of risk.
Calculation of the auxiliary buffers time with regard to the robustness of the construction schedule to disruption
Authors: Połoński Mieczysław
Published: January 2019

The literature offers numerous proposals for calculating the project buffer, located at the end of the critical chain. However, the structure of construction schedules, often consisting of several dozen or several hundred tasks, requires planning a larger number of buffers, also located on the critical chain. The article proposes an original method of dividing the duration of one buffer located at the end of a protected chain (e.g. a project buffer) into several auxiliary buffers, protecting individual fragments of this path. The basis of the algorithm that calculates their size is to take into account the robust of protected task paths before the deadline for their completion is disrupted. As a measure of robust understood in this way, the ratio of the buffer size to the sum of the variance of the task duration of the protected draft was applied. The criterion of searching for the optimal time division into several buffers was to maximize the minimum robust of all analyzed paths. The application of the proposed optimization model is illustrated on the example of a specific construction schedule.
Marchant - Rankine’s - Murzewski approach for modelling of the buckling resistance of welded I-section columns
Authors: Giżejowski Marian , Gajewski Marcin , Szczerba Radosław
Published: January 2019

This paper discusses different aspects of analytical and numerical modelling of the buckling resistance of welded I-section columns subjected to axial compression. The section considered is of class 1 that implies no local buckling affecting the column performance. The proposed analytical formulation of the buckling resistance is based on the so-called Marchant-Rankine's-Murzewski approach (M-R-M approach). The model proposed is of a 2D type and is a simplification of the 3D one that has recently been presented by the authors. The parameters of equivalent stress-strain model of the postwelding steel are calibrated in two stages of the best fit approximation procedure and with use of numerical results of the finite element simulation of the buckling resistance. In the first stage, the postyielding inelastic tangent stiffness parameter ξE,eff is evaluated with fixed value of the first yield parameter ψeff= ψcom. A target of the second stage is to assign the best fit value of the first yield parameter ψeff and the imperfection factor n that allows for accounting the effect of geometric imperfections.
Axial force prediction based on signals of the elastic wave propagation and artificial neural networks
Authors: Nazarko Piotr
Published: January 2019

The identification of internal forces is not only important to preserve the structure integrity but also to understand how their certain elements and connections work. Two examples of laboratory test are discussed in this paper. The first is related to an aluminium rod mounted in a stand where compression load was applied. Due to the relaxation phenomenon force prediction becomes even more important in case of compressed bolts. Thus, the second example is related to a bolted flange connection during static tensile test. Four out of six bolts were equipped with washer load cells. Alternatively, selected bolts were equipped with piezoelectric transducers (actuator and sensor) in order to measure signals of elastic waves. It was noted that the load increasing causes changes in the measured signals. Principal components analysis was used for dimensionality reduction of measured signals. The aim of this study is to investigate the use of elastic waves and artificial neural networks for the purpose of the force of identification. Examples of preliminary results have shown that axial forces may be estimated with relatively good accuracy.
Runners on footbridges – a newVGRFmodel for heel strike running technique
Authors: Pańtak Marek
Published: January 2019

In the paper the models of dynamic forces generated by people running referred to two running techniques i.e. forefoot strike running and heel strike (rearfoot strike) running are presented. The model of forces generated during forefoot strike running was refined taking into account proposals of various authors and the results of author’s own laboratory tests of running people. The model of the forces generated during heel strike running is a new author’s proposal elaborated on the basis of the results of laboratory tests. Presented results of analyses and the proposal of a new dynamic load model correct and complement the shortcomings of the existing models and complement the shortage of recommendations in the area of dynamic forces generated during heel strike running technique.
Effect of vertical imperfections on longitudinal railway track response
Authors: Czyczula Wlodzimierz , Chudyba Lukasz
Published: January 2019

The paper presents an analysis of linear models track response under longitudinal loads due to braking and accelerating of the train as well as constant traction forces. Longitudinal forces on the wheel-rail contacts are uniformly distributed on the whole length of train. Analysis is carried out under assumption that – in short time – train speed does not change significantly. Therefore stationary response of rail track is considered. The problem of critical speed is presented. Effect of vertical imperfections on the longitudinal rail displacement is considered under assumption that longitudinal forces varying in time are changed proportionally to the vertical forces. These forces are proportional to the amplitude of vertical imperfections. This analysis should be recognised as the main novelty of the paper. In the summary, certain practical conclusions are formulated as well as the further investigations are pointed out.
Design of machine to remove sharp edges
Authors: Michalik Peter , Molnár Vieroslav , Fabianová Jana , Petruš Michal , Roško Norbert
Published: January 2019

This article deals with the design of machine to remove sharp edges of components for manufacturing. After working with any technology, pressing, casting or machining, sharp edges and dirty surfaces of the finished parts need to be clean and removed by sharp edges. Serial production machines are expensive and are unprofitable for piece and small-lot production. Design materials, electric drives, coupling and damping components selected for the design.
Design of material conveying by variable pipe conveyor
Authors: Mikušová Nikoleta , Ignáth František
Published: January 2019

The latest requests for transport are based on cost, energy and material saving and also a very important request is an environmentally friendly transport system. One of these systems is presented by pipe conveyor and its modification - variable pipe conveyor. The paper presents the results of the part of a realized case study which includes the design of a variable pipe conveyor and associated calculations for the design of material conveying. The paper presents the selected part of the calculation, namely calculation of tensions in the conveyor belt, the spacing of idler rollers and solution of the dump.
Strength of composite plate with parallel offset misalignment double-bolted joint under bending moment
Authors: Krajangsawasdi Narongkorn , Bunyawanichakul Phacharaporn
Published: January 2019

The connection concept of placing only two bolts in offset misalignment against the bending load along the wing span was used for an aerobatic airplane designed in Thailand as a KIT plane to minimize the impact of drilling numerous holes. This concept can deviate the force direction on the holes. The two suitable drilling positions should have the lowest resultant force and highest strength of fiber reinforcement structure. To investigate the strength of the fastener hole when the force deviated from the original orientation, specimens, made from twill weave carbon fiber-epoxy and laid up at ±45-degree orientation, were tested under bearing load according to ASTM D5961 standard. The experimental results revealed that the bearing strength of CFRP material decreases when the force deviation angle increases, so zero-angle deviation of the resultant force on the drilling hole is the most suitable orientation to absorb bolt bearing load. The most suitable pattern of two offset misalignment holes is the greatest horizontal distance at zero vertical distance when it was considered only the effect of the bearing strength and the deviation angle. Moreover, the failure pattern begins to deviate along the fiber orientation when the inclination angle increased.
Flow properties of finely dispersed binder
Authors: Bazhenova Olga , Bazhenova Sophia , Bazhenov Marat , Ambaryan Saak , Gleyzer Mikhail
Published: January 2019

This article contains information about strengthening the under-ground parts of buildings and restoration of their bearing capacity, along with solutions of urea-formaldehyde resin and solutions based on sodium silicate (which have a number of significant drawbacks, such as short-lived strengthening, low strength of reinforced soil (0.1-0.5 MPa), brittle destruction under dynamic loads, environmental pollution), using impregnation compositions based on fine mineral binders. This compositions, with the name «Mikrodur», are obtained on the basis of air separation of Portland cement CEM I 52.5 (PC D0 M600) and fine-divided blast furnace slag. The method of preparation of suspension on the basis of finely dispersed binder is considered. The main characteristics determining the finely dispersed binder suspension, such as viscosity and stability of the injectable suspension (sedimentation), are established. It is proved that the indexes of viscosity and stability of solutions depend on the method of their preparation, water/binding ratio and chemical admixtures. A variety of finely dispersed binders grades on mineral composition allows providing ground, stone and concrete structures of underground constructions stabilization taking into account various requirements: strength enhancement and anti-filtration properties of the strengthened masses, their resistance to various aggressive influences, the possibility of hardening in conditions of negative temperature, acceleration of a strength enhancement.
Temperature and moisture distribution in a highway in south-eastern Kazakhstan
Authors: Teltayev Bagdat , Suppes Elena
Published: January 2019

The matters of investigation for water thermal regime of pavement and subgrade structures of the highways are especially important as the moisture and temperature distribution in pavement and subgrade layers impact greatly on their deformation and strength indicators. Experimental results, which can be obtained by special measurement devices, are primary ones for establishing of peculiarities and regularities for distribution and migration of heat and moisture in the mentioned structural elements of the highways. Special measurement devices are required to obtain such experimental data. The paper shows the results for analysis of temperature and moisture variation in points of pavement and subgrade of “Almaty-Bishkek” highway. Temperature measurement has been performed by set of special sensors. Regular temperature and moisture measurement have been performed for the period from September 18, 2015 to June 2, 2016. Regularities for temperature regime variation in points of pavement for 24 hours are coordinated with air temperature variations. Amplitude of vibration for temperature is decreased with the depth increase. Moisture in subgrade points is gradually decreased with the reduction of daily average air temperature.
Analysis of roadbed destabilization causes on sections with thaw underground ice and reinforcement reconstruction measures
Authors: Zhdanova Svetlana , Neratova Oksana , Piotrovich Aleksey , Tukmakova Oksana
Published: January 2019

The roadbed on over-wet permafrost and underground ice sections requires a thorough examination after a long-term exploitation period. Its strengthening design requires an individual technological approach. The paper considers two examples. The first one is located on the 28th km section of the Chulman passing siding entrance, and the second one is on the 59th km of the Amur-Yakutsk Mainline. The causes of the roadbed deformation are determined by the analysis of different surveys, special engineering and geological methods as well as the geometry car ongoing data. Some new technological design solutions that are patented and introduced on working sites are covered in the paper.
Applying cluster analysis to ranking the vulnerabilities of railway influence territory
Authors: Katin Viktor , Kosygin Vladimir , Akhtiamov Midkhat , Lutsenko Andrey
Published: January 2019

The article considers the proprietary method of ranking the territory of the railway influence, based on the use of vulnerability matrices and application of cluster analysis, which allows optimizing the decision-making process for responding to emergencies associated with rail transport. The "point" ranking of vulnerabilities in the zone of railway influence was used for more accurate information on the events with applying the identity matrices of vulnerabilities. The partition cell is taken as a single "point". The method is based on the ranking of ecological, economic, environmental, bioresource and cultural significance of the territory by means of defining identical matrices of vulnerabilities that describe each point of the event. The partition cells were grouped into three clusters: moderately vulnerable territory, highly vulnerable territory and extremely vulnerable territory. The result of using the method was the compiling of vulnerability ranking maps.
Hydrodynamic structure of laminar flows with oppositely-swirled coaxial layers
Authors: Zuikov Andrey , Orekhov Genrikh
Published: January 2019

The article is devoted to the theoretical study of hydrodynamics of laminar flows with coaxial layers swirled in opposite directions and moving along the pipe. Such flows in a turbulent range have a wide practical application potential in technologies of dissipation of mechanical energy and mixing multiphase and heterogeneous media in microbiology, chemistry, ecology, heat engineering, power engineering, engine and rocket engineering. The article describes the tensor of viscous tangents (τii) and normal (σii) stresses. The questions of stability of flow according to the Rayleigh (Ra) and Richardson (Ri) criteria are considered. Calculation formulas and graphs of radial-axial distributions of viscous stress components, local stability zones are given, the point of “crisis and decay of the flow” or “vortex breakdown” is indicated. The solutions are obtained in the form of Fourier-Bessel series. The analysis of the hydrodynamic structure of the flow is made.
The bridge dynamic properties monitoring
Authors: Melcer Jozef , Kuchárová Daniela , Lajčáková Gabriela
Published: January 2019

The SNP Bridge over the Danube in Bratislava represents an attractive steel cable-stayed bridge. Its length is 431.8 m. The submitted paper describes the methodology of experimental testing and presents some results of the loading test. During this test it was observed that the dilatation unit on the right water side shows some failure. Due to this failure the dilatation unit acts as a generator of vibration of the end bridge span. On the basis of experimental measurements this failure was detected and the dilatation unit was renovated.
The study of deformations of the soil mass at construction of underground structures with advanced anchoring
Authors: Stradanchenko Sergey , Maslennikov Stanislav , Dmitrienko Vladimir , Kokunko Irina , Chertov Yuri
Published: January 2019

The development of underground space has a negative impact on the state of objects on the surface. The search of effective ways to prevent deformation of the soil mass has not lost its relevance. The study focuses on advanced anchoring. Based on the analysis of the technological and structural solutions for the construction of the dismantling chamber No. 1 of the Kalininsko-Solntsevskaya line of the Moscow Metro, and studies of stress-strain states of the marginal rock mass in the bottom hole zone by using the finite element method, the measures to ensure the stability of the surrounding rocks and the protective screen of the chamber were considered. The simulation of the stress state of the rock massif shows the weaknesses in the operation of the structures, so the solutions for reducing the surface shrinkage during hardening of the array by advanced anchoring were proposed.
Determination of the stress-deformed state components of the rock mass around the mine opening fixed by anchors
Authors: Pankratenko Alexander , Bugayev Vadim
Published: January 2019

The analytical investigation of the stress-deformed state of the rock mass around mine with random cross-section and anchorage is completed. The problem is solved in reliance on tangential stress, that arising in anchors.
Modern technology of construction of underground part of buildings in urban conditions
Authors: Sinenko Sergey , Pakhomova Liliya , Chernyshova Alexandra
Published: January 2019

It is considered the construction of the underground part of buildings and structures by "Moscow method", the essence of which is an arranging of pit’s enclosing structure – "wall in ground" in common with the underground part of a building, when pit enclosure is braced in outward thrust with disks of major floors of the underground part of the erecting building, which are connected to each other by a system of spacers, suspensions and racks forming support structure. The positive and negative features of the method are given. The article summarizes the experience of this method, which is advisable to use in construction of the underground part of buildings or structures in cramped urban conditions, provided that the enclosing structure of a pit is "wall in ground". One highlights the stages and gives the main specific features of the method. It is shown that this method leads to a reduction of work costs at the zero cycle, but it increases the duration of work.
Increasing environmental compatibility of metal production
Authors: Sharapov Rashid , Kharlamov Evgeny , Yadykina Valentina
Published: January 2019

Building materials production generates a large amount of harmful substances poisoning the atmosphere. One of the major sources polluting cities environment is metallurgical industry. Concentration is one of the most important processes where empty components are extracted from the rock. During ore concentration, an increasing number of man-made wastes are generated; they pollute the air and huge area around the factories discharging these wastes. This reduces both space for people to live and place for cities to function and develop. It should be noted that metal production enterprises have accumulated billions of tons of industrial wastes (tailings) that include a large amount of iron-containing materials and rocks; these can be used as building materials, for example, when preparing fine-grained concrete as a mineral powder as well as in construction of roads, houses, in paint production, etc.
Sustainable architecture: trends in higher professional architectures’ education
Authors: Kuzmina Svetlana , Morozova Natalia , Pimenova Anna , Agafonova Alena
Published: January 2019

In the article we tried to investigate theoretical ideas concerning actual students’ reasons for education in the field of architecture in frame of the second level of higher professional education system. We present the results of survey that we conducted last year. We collected data about students’ reasons to enrol for architectures’ and others master programmes and their expectations of programmes’ content, programmes’ volume, curriculum structure, placement periods. We analysed the teaching methods, structure and trends in architecture’s master programmes that was legally introduced by government standards. As a result, we concluded that the changes of education standards mostly meet expectations of master programmes contenders. However, the contenders will succeed in higher school only if their motivation is enough strong and appropriate.
Analysis of interrelation of financial results and financial condition of the company
Authors: Adamaуtis Lyudmila , Zonova Nadezhda , Petrova Elena , Palesheva Nadezhda , Gritsuk Natalia
Published: January 2019

The article deals with the fundamental categories of company analysis in a market economy such as its financial results and financial condition. Special attention is given to the study and justification of the mutual influence and dependencies between them with the help of formalized analytical models, non-formalized logical and empirical studies and conclusions. In particular, the authors of the article justify the mechanism of the influence of profit and profitability on bankruptcy risks. They underline the importance of obtaining the required amount of profit and the correctness of its use. Moreover, the authors propose criteria for evaluating the rational distribution and use of the company's net profit. The influence of the profit capitalization factor is confirmed by the example of a model of sustainable economic growth. The authors emphasize the importance of the issues under consideration in the development of management decisions, including the formation of dividend policy. The article also presents the authors' approach to some methodological aspects of analyzing the use of profits. The research is based on the financial statements of Russian construction companies. However, these models can be applied to commercial companies in other fields of activity.
Specific control mechanisms for the Russian railway construction in the reign of Alexander III
Authors: Barykina Inna
Published: January 2019

The article covers the issues of the Russian railway development as part of the supply chain. The author discusses management process specific features in respect of the Northern Railway network construction and historical aspects concerning the Russian Empire during the reign of Alexander III. Solution to this problem was to develop specific (extraordinary) mechanisms of public governance. They included a special Institute of the Commission of experts and a special form of legislative acts called the all-Merciful manifestos. The study revealed disadvantages of such autocratic governing practice for railway construction and proved inefficiency of this approach to develop controlling mechanisms.
Algorithmization of the optimization apparatus in the organization of the current planning at the companies of the building complex
Authors: Oleinik Pavel , Yurgaytis Alexey
Published: January 2019

The issue of optimizing the decisions of the planning system at various levels and stages of construction production is one of the most important aspects of managerial and engineering activities at the construction enterprise. Such optimization is a complex multifactorial task, the solutions of which are reflected in the established documents based on the results of planning. The main document in this respect is the production and economic program (plan) developed by the planning and economic department of the corresponding construction enterprise, depending on the existing destabilizing factors and constraints established by the results of the integrated planning procedure (annual and strategic). The article discusses the concept of the annual production program of a construction company and a new approach to optimize the algorithm for distributing the resource potential between objects of the annual program.
Economic dimension of engineering and construction in Russian orthodox temple architecture
Authors: Bovsunovskaya Maria , Saltykov Ivan
Published: January 2019

Economic dimension of engineering and construction in Russian orthodox temple architecture (reliable determination of church construction estimate cost and it’s optimization) is in the best interest of engineering companies, the Russian Orthodox Church, state authorities and potential investors as basis for assessment of investment, cost control, cost saving in temple complex construction. The article gives methodological aspects of cost estimate determination in temple architecture, synthesizes cost expenditures for temple construction, proposes and analyses cost-saving solutions.
Quality management assurance using data integrity model
Authors: Artamonov Igor , Deniskina Antonina , Filatov Vladimir , Vasilyeva Olga
Published: January 2019

High complexity of modern quality management systems (QMS) leads to the need for new tools aimed to support them and implement continuous improvement. The key process to manage the quality level is quality assurance. The paper investigates process information integrity and consistency as properties or quality assurance process. Some basic approach for organizing data integrity metrics is described. An approach for QMS requirements assurance based on SysML modelling language is proposed.
Substantiation of the complex of organizational and economic measures aimed at ensuring the energy efficiency of residential construction
Authors: Larionova Yulia
Published: January 2019

The present paper substantiates the relevance of scientific and methodological developments that allow correctly checking the compliance of actual energy efficiency indicators of residential buildings with specified parameters. The contradictions of the aims and economic interests of suppliers and end users of energy resources were revealed. The paper reasons the need to develop and implement a set of organizational and economic measures, which should be aimed at inducing individuals, developers, construction contractors and enterprises and the building materials industry, as well as at changing the current system of performance indicators of the Ministry of Energy of Russia, natural monopolies and resource-supplying companies.
Theoretical aspects of studying the problems of corporate planning in construction companies
Authors: Serov Viktor
Published: January 2019

In accordance with full economic responsibility for the results of economic management and aims of production development, construction companies demand business planning. The paper considers the principles of business planning, including continuity, in accordance with which a three-level development of business plans is appointed: firstly, integral organization, then organization of its production and production service areas, and finally organization of gained contracts. The author proposes the composition and structure of business plans coupled with the system of operational and production calendar planning of construction production and budgeting of production-and-business activities. The paper also offers the development of internal passports of the applied technologies for construction and installation works, which allow having real rates of consumption of production resources for operational and production planning of construction and installation works.
Organizational and economic-and-legal problems of the transition from the equity residential construction to project financing
Authors: Larionov Arkady , Omarov Magomed , Kostusenko Ilya
Published: January 2019

The paper focuses on the features and specificity of the regional market of residential construction in the Moscow region. The authors claim and prove that the solution of complex modern problems of residential construction and the creation of conditions for its further development is directly related to the reasonable application of the existing repertoire of organizational and economic methods of governmental control over this national economy sector. The article represents the authors’ opinion on implementing the new laws on equity housing construction that have come into force and their consequences in terms of the well-balanced protection of the rights of citizens participating in equity construction and the economic interests of developers. A possible scenario of premature abandonment of equity construction and the transition to project financing is described.
Care and education in adolescents with sleep and eating disorders: Experience of the Mediterranean Adolescent Center
Authors: Bat-Pitault F. , Campredon S. , Da Fonseca D.
Published: January 2019

Eating disorders and school refusal behavior with delayed sleep phase are pathologies associated with very different or even inverse school problems. It is through these two prisms that we will develop the idea of school care, which is being set up in the innovative framework of the Mediterranean Area of the Adolescent, integrating a National Education Unit within the Child and Adolescent Psychiatry unit.

This specific care seems to us interesting in the adolescent because it allows a work in «natural» environment of certain difficulties related to the different psychiatric disorders and seems to us as a help to the revival of the adolescent process.
Adverse effects of eating disorders on the oral health of teenagers
Authors: Colon P. , Cougot N. , Famery C.
Published: January 2019

Eating disorders in teenager’s population has a wide range of expressions from a large consumption of sodas or sugar, to binge drinking, anorexia nervosa and anorexia bulimia. Tooth wear or high caries risk could be the clinical expression of such harmful habits and the dental clinical examination could be the way for an early diagnosis of eating disorders

In this kind of situation, discussion with the teenager should be preferred. Epidemiological studies have demonstrated a higher prevalence of such eating behaviors especially for teenagers. Vomiting and gastro esophageal reflux to lead to dental erosion could also be correlated to bruxism and attrition. Prevention and interception of harmful habits are the best way to stop teeth degradation purpose restorative procedure is sometimes required.

Orthodontic therapy is a good opportunity for discussion with teenagers to identify risk factors, but an advised selection of biomaterials is also required during the orthodontic treatment.
Sleep bruxism and sleep disorders
in adolescents
Authors: Carra M. C.
Published: January 2019

Sleep Bruxism, the sleep-related movement disorder of tooth grinding and clenching, is highly reported in pediatrics with a prevalence of up to 40 % during childhood and adolescence. The precise etiology of sleep bruxism remains unknown, but it may involve genetic and psychosocial components (such as anxiety and stress).

Clinicians should be aware that quite often sleep bruxism is associated with other disorders, such as snoring, sleep-disordered breathing, sleep complaints, and behavioral problems. These comorbidities should be investigated, because they may be severe and prolonged if they are not treated.

SB may lead to morning jaw muscle soreness or pain, headache, masticatory muscle hypertrophy, temporomandibular disorders, and tooth wear. Especially in pediatrics, sleep bruxism is usually managed with conservative therapies, such as sleep hygiene, behavioral modifications, biofeedback, familial counseling and, only in cases of severe tooth wear or other serious possible consequences of SB, soft occlusal splints.
Prospects for development of Ukraine and EU in the field of renewable energy sources
Authors: Khomenko Mykola , Pryakhina Kateryna , Latyshev Kostyantyn
Published: January 2019

In article assessment of tendencies and prospects of cooperation between Ukraine and the European Union in the field of renewable energy sources was carried out. Over the past decades, the theme of climate change, especially caused by human activity, has become one of the most acute and most exploited in scientific disputes. Today, the problem of finding new sources of energy is more than acute, with a special place occupy non-traditional ones. The reduction of Ukraine's energy dependence on traditional fuel resources is possible only through the development and use own alternative energy, which uses local resources – bioenergy as a fuel or does not require a fuel component at all – solar, wind and small hydropower. The European Union is one of the leaders in the implementation of alternative energy and renewable energy sources and initiates the creation of many organizations that finance alternative energy projects. Ukraine should ensure the effective convergence of its own legislation with the European Union, since it defined the European integration vector as a priority area of foreign policy development. At the same time, within the framework of the Union, the mechanism of environmental protection and progressive approaches to the implementation of energy policy, including in the field of renewable energy, can serve as the most constructive benchmarks for Ukraine's development in this area. Ukraine signed the Paris Agreement, and undertook certain commitments, namely: in accordance with the National Action Plan on alternative energy up to 2020, the objective was to reach 11% of RES in gross final energy consumption. Achieving this goal is possible only in the case of international cooperation with the EU in the field of alternative energy. However, today, the study of the prospects of cooperation between Ukraine and the EU in this field is not developing sufficiently and there is a certain vacuum in solving strategic problems in this context, which determines the relevance of the topic.
Banking competition and its development in Russia
Authors: Korobov Yury
Published: January 2019

The article discusses theoretical issues of banking competition as well as its ifluences on the development of banking system (transformation of the essence of a bank; change of the target setting in banking; transfer of emphasis from operations to services; universalization of banking; transition from individual services to integrated banking products; change of priority from price to non-price methods of competition; transition from extensive to intensive type of network development; increasing the role of near-banks and nonbank banks). Factors influencing banking competition in Russia are shown: both restraining (reduction in the number of banks; concentration of assets at the largest banks; uneven territorial distribution of banks; local character of banking markets) and strengthening (financial globalization; digitalization of economy; forming of new banking culture).
Using Kohonen networks in the analysis of transport companies in the Czech Republic
Authors: Krulický Tomáš
Published: January 2019

The transport sector has a significant impact on the performance of the Czech economy. Transport companies, of course, have their own specificities, whether they deal with ecology or the financial and economic situation. It is precisely the economic position of a transport company that needs to be analysed in order to identify the need for change, to predict the further development of such company. For analysis, a variety of methods is used, of which artificial neural networks are a very interesting and effective tool. The aim of this paper is to make a cluster analysis of transport companies operating in the Czech Republic based on this tool. The data of the financial statements of transport companies in the Czech Republic in 2016 are taken into account. Only some items from the financial statements are selected for analysis. The file is then subjected to a cluster analysis, specifically using the Kohonen networks – Statistica software. In accordance with the methodology of the contribution, the data is divided into three sets - training, testing and validation. Companies were divided into clusters in the 10x10 Kohonen Map. Some clusters are significant in terms of number of companies. These clusters are further analysed. Specific conclusions are made: A larger company generates, on average, a higher operating profit, larger companies achieve higher ROE and, in the case of a larger company, the financial leverage acts more positively.
Theoretical and practical view of development and differences in the application of productive consumption components in Czech and Slovak households under current economic conditions
Authors: Psárska Marianna
Published: January 2019

The aim of the contribution is to point out the possible causes of changes and differences in the behavior of current households in the context of new consumption theories and current conditions by means of selected categories of net cash expenditure of households2 embodying the productive aspect of consumption. The monitored data is based primarily on Family Account Statistics for the period of 2010-2017. The benefit of this contribution is in particular the application and clarification of the links between the current theories and practice which helps to understand the economic behavior of households. The conclusions of the article point out that household decision-making is largely influenced by the economic situation of households, but also by other factors which we also deal with in the contribution. It is clear from the conclusions that Czech and Slovak households apply a different approach to expenditures on productive components of consumption, which in the long run will deepen the differences between countries. In the context of the evolving direction of the Behavioral Economy, it would be helpful to include the monitoring of psychological factors in Family Account Statistics.
Comparison of neural networks and regression time series in estimating the Czech Republic and China trade balance
Authors: Rowland Zuzana , Šuleř Petr , Vochozka Marek
Published: January 2019

Foreign trade has been and is considered to be very important. Trade balance measurement provides one of the best analyzes of a country's external economic relations. It serves as a monetary expression of economic transactions between a certain country and its foreign partners over a certain period. The aim of this paper is to compare the accuracy of time series alignment by means of regression analysis and neural networks on the example of the trade balance of the Czech Republic and the People's Republic of China. Trade balance data between the Czech Republic and the People's Republic of China is used. This is a monthly balance starting in 2000 and ending in July 2018. First, a linear regression is made followed by regression using artificial neural networks. A comparison of both methods at expert level and experience of the evaluator, the economist, is performed. Optically, the LOWESS curve appears to be best out of the linear regression and the fifth preserved RBF 1-24-1 network seems the mot appropriate out of neural networks.
Surprising Bone and Soft Tissue Lesions of the Chest: Pictorial Review
Authors: Degrieck Bert , Bazzocchi Alberto , Verstraete Koenraad
Published: January 2019

Although plain radiographs of the chest are usually requested to evaluate the heart, lung, and mediastinum, many bone and soft tissue, metabolic, and congenital lesions can be visible presenting as surprising lesions. Thorough analysis of the lesion characteristics on the chest radiograph, eventually in conjunction with more advanced imaging techniques and in combination with the clinical findings, will lead to the correct diagnosis.
Differential Diagnosis of Spine Tumors: My Favorite Mistake
Authors: Albano Domenico , Messina Carmelo , Gitto Salvatore , Papakonstantinou Olympia , Sconfienza Luca
Published: January 2019

Imaging has a pivotal role in the detection and characterization of spine bone tumors (SBTs), especially using magnetic resonance (MR) imaging and computed tomography (CT). Although MR performed with conventional pulse sequences has a robust reliability in the assessment of SBTs, some imaging features of benign lesions and malignancies overlap, making the differential diagnosis challenging. Several imaging tools are now available to perform a correct interpretation of images of SBTs including diffusion-weighted imaging, dynamic contrast-enhanced MR, Dixon sequences, and dual-energy CT. Nevertheless, strengths and weaknesses of imaging modalities should be kept in mind, and it is crucial to be aware of the pitfalls that can be encountered in daily clinical practice when dealing with these lesions. This review provides an overview on the main challenges encountered when dealing with SBTs, providing some tricks of the trade to avoid possible diagnostic traps.