bluuebunny/crossref_metadata_2025 huggingface dataset:
High‐Resolution Local Measurements of F Region Ion Temperatures and Joule Heating Rates Using SuperDARN and Ground‐Based Optics
Authors: Kiene A. , Bristow W. A. , Conde M. G. , Hampton D. L.
Published: December 2018

Frictional heating, frequently termed Joule heating, results from the difference in ion and neutral flows in the Earth's upper atmosphere and is a major energy sink for the coupled magnetosphere‐ionosphere‐thermosphere system. During disturbed geomagnetic conditions, energy input from the Earth's magnetosphere can strongly enhance ion velocities and densities, which will generally increase the rate of Joule heating. Previous theoretical and experimental studies have shown that small‐scale variations in Joule heating can be quite significant in the overall energy budget. In this study, we employ high‐resolution fitting of ion velocities obtained by Super Dual Auroral Radar Network (SuperDARN) coherent scatter, along with spatially resolved neutral wind data from the Poker Flat Scanning Doppler Imager, to examine the spatial and temporal structure of F region ion temperature enhancements, as well as changes in Joule heating rates due to the neutral wind. These results are compared to those obtained using Poker Flat Incoherent Scatter Radar in order to assess the validity of this analysis, with the objective of developing a method that can be applied to any current or future neutral measurements worldwide, thanks to the global coverage of SuperDARN. We examine the agreement between the ion temperatures predicted using the Scanning Doppler Imager‐SuperDARN method and the temperatures measured directly by Poker Flat Incoherent Scatter Radar and discuss possible reasons for any discrepancies. We observe significant spatial structure in both the ion temperature and Joule heating rates during periods of magnetic activity.
Cytokine Thresholds in Gingival Crevicular Fluid with Potential Diagnosis of Chronic Periodontitis Differentiating by Smoking Status
Authors: Arias-Bujanda N. , Regueira-Iglesias A. , Alonso-Sampedro M. , González-Peteiro M. M. , Mira A. , Balsa-Castro C. , Tomás I.
Published: December 2018

The objective of the present study was to determine cytokine thresholds derived from predictive models for the diagnosis of chronic periodontitis, differentiating by smoking status. Seventy-five periodontally healthy controls and 75 subjects affected by chronic periodontitis were recruited. Sixteen mediators were measured in gingival crevicular fluid (GCF) using multiplexed bead immunoassays. The models were obtained using binary logistic regression, distinguishing between non-smokers and smokers. The area under the curve (AUC) and numerous classification measures were obtained. Model curves were constructed graphically and the cytokine thresholds calculated for the values of maximum accuracy (ACC). There were three cytokine-based models and three cytokine ratio-based models, which presented with a bias-corrected AUC > 0.91 and > 0.83, respectively. These models were (cytokine thresholds in pg/ml for the median ACC using bootstrapping for smokers and non-smokers): IL1alpha (46099 and 65644); IL1beta (4732 and 5827); IL17A (11.03 and 17.13); IL1alpha/IL2 (4210 and 7118); IL1beta/IL2 (260 and 628); and IL17A/IL2 (0.810 and 1.919). IL1alpha, IL1beta and IL17A, and their ratios with IL2, are excellent diagnostic biomarkers in GCF for distinguishing periodontitis patients from periodontally healthy individuals. Cytokine thresholds in GCF with diagnostic potential are defined, showing that smokers have lower threshold values than non-smokers.
Modulation of benzylisoquinoline alkaloid biosynthesis by overexpression berberine bridge enzyme in Macleaya cordata
Authors: Huang Peng , Liu Wei , Xu Min , Jiang Ruolan , Xia Liqiong , Wang Peng , Li Han , Tang Zhaoshan , Zheng Qiyin , Zeng Jianguo
Published: December 2018

Macleaya cordata produces a variety of benzylisoquinoline alkaloids (BIAs), such as sanguinarine, protopine, and berberine, which are potential anticancer drugs and natural growth promoters. The genes encoding the berberine bridge enzyme (BBE) were isolated from M. cordata and Papaver somniferum, and then the two genes were overexpressed in M. cordata. Through liquid chromatography with triple-quadrupole mass spectrometry analysis, it was determined that McBBE-OX caused higher levels of (S)-norcoclaurine, (S)-coclaurine, (S)-N-cis-methylcoclaurine, (S)-reticuline, (S)-tetrahydrocolumbamine, (S)-tetrahydroberberine, (S)-cheilanthifoline, and (S)-scoulerine than PsBBE-OX, empty vector or control treatments. qRT-PCR analysis demonstrated that the introduced genes in the transgenic lines were all highly expressed. However, the levels of sanguinarine (SAN) and chelerythrine (CHE) in all the transgenic lines were slightly lower than those in the wild-type lines, possibly because the overexpression of McBBE causes feedback-inhibition. This is the first report on the overexpression of potential key genes in M. cordata, and the findings are important for the design of metabolic engineering strategies that target BIAs biosynthesis.
Annulating thiazolium cations via a direct double C–H activation strategy: Rh–N,S-heterocyclic carbene is the key
Authors: Dutta Champak , Sainaba Arppitha Baby , Choudhury Joyanta
Published: December 2018

Metal–N,S-heterocyclic carbene intermediates are conveniently generated and utilized for the first time to construct N,S doubly-doped cationic tricyclic organic molecules which exhibit easily-tuneable emission.
Heavy atom labeling enables silanol defect visualization in silicalite-1 crystals
Authors: Li Teng , Krumeich Frank , Ihli Johannes , Ma Zhiqiang , Ishikawa Takashi , Pinar Ana B. , van Bokhoven Jeroen A.
Published: December 2018

A heavy-atom labeling approach in conjunction with electron microscopy allows visualization of the distribution of silanol defects at the single crystal level.
A multifunctional toolkit for target-directed cancer therapy
Authors: Terrazas Montserrat , Sánchez Dani , Battistini Federica , Villegas Núria , Brun-Heath Isabelle , Orozco Modesto
Published: December 2018

A novel tumor-targeted RNA toolkit encoding multiple functions in a single structure.
A microfluidic platform utilizing anchored water-in-oil-in-water double emulsions to create a niche for analyzing single non-adherent cells
Authors: Cai Bo , Ji Tian-Tian , Wang Ning , Li Xin-Bo , He Rong-Xiang , Liu Wei , Wang Guobin , Zhao Xing-Zhong , Wang Lin , Wang Zheng
Published: December 2018

Water-in-oil-in-water double emulsions (W/O/W DEs) are generated to encapsulate non-adherent cells and anchored in an array on-chip for in situ assays.
Flow focusing through gels as a tool to generate 3D concentration profiles in hydrogel-filled microfluidic chips
Authors: Loessberg-Zahl Joshua , van der Meer Andries D. , van den Berg Albert , Eijkel Jan C. T.
Published: December 2018

We present a novel extension of laminar flow patterning using Darcy flow within cured three-dimensional hydrogels for precise delivery of solutes.
Changes in the composition and structure at PET-waste processing into building materials
Authors: Fomina Natalya , Fedotova Olga , Polyanskiy Mikhail
Published: December 2018

The results of studies of the composition and structure of polyethylene terephthalate in the process of thermomechanical processing of polymeric wastes as well as properties of waste products obtained on the basis of waste are presented. Methods of infrared spectroscopy, differential thermal analysis and thermogravimetry, as well as standard methods for manufacturing and testing the technical properties of samples of structural building products were used. As a result of thermomechanical processes during re-melting of polyethylene terephthalate waste, the number of hydroxyl groups in the polymer composition decreases, due to the possible cross-linking and polycondensation of macromolecules through terminal hydroxyl and unactivated carboxyl groups. In this case, conformational rearrangements take place in the structure of polyethylene terephthalate. When thermomechanical processing of secondary PET with rapid cooling of the melt, the temperature of the onset of subsequent melting decreases, which allows to reduce power consumption in melting-mixing units during the process of manufacturing construction products. Construction and technical properties of secondary PET as binder composite building materials allow to obtain potentially durable products with structural strength and high decorative.
Model of creation a multilayer structure for production of building pipes
Authors: Dyadichev Valery , Kolesnikov Andrey , Dyadichev Aleksandr , Menyuk Sergey , Dyadicheva Ekaterina
Published: December 2018

A scientific article presents the main goals that can be achieved through the use of co-extrusion processing technology and equipment for the processing of secondary polymer and building materials. The main indicator of the multilayered product being created in the process of co-extrusion processing of secondary building and polymer materials is determined. The methods of quality control of the mixture preparation from secondary materials and quality of manufacturing of a finished co-extrusion product are considered. A reference mathematical model of a co-extruded product containing secondary building and polymer materials is constructed. Based on the results of the studies, the article presents an analysis of the ecological state of building and polymer wastes. The necessity of further research in the field of improving the model of the formation of a multilayer structure of a given quality for the process of processing this waste is substantiated. For the existing practice of preparing a mixture of polymer and building material wastes, the volumetric costs of components are determined by recipes. An analysis of the equations obtained allows us to refine the recommended numerical values of the percentage of primary polymer on the basis of the required standard strength of the building pipe from secondary materials.
Combined Effects of Bottom Ash and Expanded Polystyrene on Light-weight Concrete Properties
Authors: Tang Van Lam , Vu Dinh Tho , Vu Kim Dien , Bulgakov Boris , Aleksandrova Olga , Bazhenova Sophia
Published: December 2018

The benefits of using waste materials as a partial replacement for cement in high performance concrete are also discussed. This paper presents the combined effects of bottom ash TPP “Vung Ang” and expanded polystyrene aggregate on different the properties of light-weight concrete. Twenty different concrete mixtures with a water to cement ratio of 0.4 and superplasticizer to cement ratio of 0.015 were used. On the one hand, the EPS was partially replaced with (0 ÷ 40)% by volume of concrete mixture. On the other hand, the fine aggregate was replaced with (0 ÷ 30)% by mass of BA TPP “Vung Ang”. The engineering properties, including workability, density and compressive strength of light-weight concrete were investigated at different curing times. The level of decrease in the strength depends upon the replacement level of EPS and BA. Specifically, the concrete containing 40% EPS and 30% BA at 28 days of age decrease in average density and strength were 43.2% and 26.4%, respectively, in comparison with the control concrete.
Impact of the degree of grinding of siliceous opoka-like rocks on properties of ceramic products
Authors: Terekhina Julia , Bozhko Julia , Lapunova Kira , Postoi Lyudmila
Published: December 2018

This work presents the results of the laboratory research on the impact of grain size composition of raw mixtures on properties of heat processed products when implementing the compression molding method. We have analyzed opokas of several fields: Zhuravksy, Shevchenkovsky and Bekeshevsky. Grain size composition of ground materials was characterized by a greater grain size of 0,315; 0,63; 1,25 and 2,5 mm. The link between degree of grinding and caking index, water absorption, mean density, compression and bending resistance was established. The conclusions based on the research results revealed the impact of grain size composition on properties of ceramic products and application potential of opokas as a feedstock in the ceramics industry.
Analysis of Specificity of ecological insulation material thermal Parameters
Authors: Gaujena Baiba , Tihana Jelena , Borodinecs Anatolijs , Agapovs Vladislavs
Published: December 2018

This paper is devoted to analysis of insulation materials quality and characteristics, method for the determination of thermal conductivity coefficient and the influence of various factors on the thermal conductivity coefficient. The paper summarizes the estimated process consumption of thermal energy. The research is defined experimental hemp fiber-sheaves insulation plates manufactured in Latvia further specified actual parameter and quality water absorption; thickness changes; drying process; thermal conductivity coefficient; thermal conductivity coefficient depending from moisture. Research is made using experimental hemp fiber-sheaves insulation pattern manufactured in Latvia – plates in size 300 x 300 mm. In research totally are used three hemp fiber-sheaves pattern series with different substance and extrusion modes. Each series consist from four plate with different thickness. As result of research is determined hemp fiber-sheaves insulation pattern Water absorption, dynamics of Drying process, Thickness changes, Thermal conductivity coefficient and Thermal conductivity coefficient depending from moisture.
Investigation of fungicidal activity of biocides by method of direct contact with test cultures
Authors: Strokova Valeriya , Nelyubova Viktoriya , Rykunova Marina
Published: December 2018

The article substantiates the possibility of using the method of direct contact with test cultures as an express method for assessing the quality of biocidal substances. This technique allows to test soluble biocidal preparations, while reducing the time of biocide selection, which eliminates the need for large-scale full-scale testing of structures under real operating conditions, providing cost savings.
Effect of additives on hydration and hardening of magnesia compositions
Authors: Miryuk Olga
Published: December 2018

The article is devoted to the investigation of the influence of technological factors on the hydration and hardening of magnesia compositions. The objective – is investigation magnesia compositions with different additives. Factors which impact activity of magnesium oxide in compositions of different structure are investigated. Influence of liquid density on hardening of magnesium bindings is defined. Processes of hydration and hardening of magnesium bindings with participation of minerals – silicates are investigated. It is revealed that the addition of semi-aquatic calcium sulfate contributes to the hardening of magnesia binders. Defined effect of concentration calcium sulfate hemihydrate to the hardening of caustic magnesite. Here are proposed structures of sulphomagnesium compositions containing technogenic components. It revealed a beneficial effect on the hardening of ferrous component of the mixed magnesia binder. Composition of hydration products of magnesium binding with participation of ferriferous minerals is presented. Transformations of phases at hydration of magnesium binding are revealed. Influence of structure of bindings on transformations of hydrates is established. Results of research of magnesia bindings of long hardening are given. It is shown that the durability of stone of bindings is provided with dense structure of hydrates. In researches are used X – Ray and thermal methods, electronic microscopy.
Effect of polycarboxylate and polyarylate surfactants on corrosion of the steel reinforcement embedded in the concrete
Authors: Talipov Linar , Velichko Evgeny
Published: December 2018

We considered the possibility to inhibit the corrosion of the steel reinforcement embedded in the concrete using different polymeric surfactants, when paired with the passivating and plasticizing chemical additives. Previously [1] the authors proposed the method to form the protective films on the surface of the steel reinforcement embedded in concrete using the polycomponent anticorrosion naphthalene sulfonate superplasticizer based additives. The results of further surveys provided in this article proved, that under the special conditions the polyarylate and polycarboxylate surfactants are capable to keep the steel reinforcement in the passive state in presence of chlorine ions. This is especially relevant, considering the fact, that the polymer additives intended for plasticization of concrete are more widely used for the manufacturing of the monolithic and prefabricated reinforced concrete structures. In the same time Deicing agents having in its composition chlorine ions, are widely used for deicing of roads in different countries. Chlorine ions adversely affect the reinforcement of concrete artificial structures in transport. the corrosion of metals incurs huge losses, the global cost is $ 2.5 trillion, equivalent to 3.4% of world gross domestic product (GDP) for 2013[2]. In 1993, the United States spent 20 billion dollars on the repair of reinforced concrete bridges only because of the impact of chlorides[3].
Influence of steam curing on properties of fiber-reinforced concrete during hardening
Authors: Soloviev Vadim , Nurtdinov Marsel , Belikov Sergey , Matyushin Evgeniy
Published: December 2018

To increase the efficiency of steel-fiber concrete production, the existing technological operations that could reduce the costs should be optimized. This process requires scientific research and analysis of the existing results to improve the efficiency of each production stage. One of the important stages in the steel-fiber concrete production is steam curing, which is responsible for forming the cementitious matrix structure. To increase the efficiency of this production stage, a study was conducted to develop the steam curing conditions according to the rules of steel-fiber concrete structure formation and the methods of improving durability indicators. Tests on several steel-fiber concrete compositions were conducted, and the relations between its thermal conductivity and the reinforcement coefficient of concrete were revealed. The results of the tests let us conclude that with the increase of the reinforcement coefficient its thermal capacity decreases. The temperature gradient charts along the cross-section of samples with different cement/sand ratios and reinforcement coefficients were built. According to the data obtained, the optimal industrial conditions of steam curing were discovered. The dependences determining the increase of mechanical performance of steel-fiber concrete due to the formation of prestressed fiber structure in the material were revealed.
Improvement of the reliability and durability parameters of hydrotechnical structures under conditions of hydrodynamic influence of flows on structural elements
Authors: Solovyev Alexander , Solovyev Dmitry , Shilova Liubov
Published: December 2018

This article concerns the methodological issues of developing principles for increasing the reliability and durability parameters of equipment and auxiliary mechanisms of hydrotechnical structures. An analysis of the conditions ensuring an increase in the accuracy of engineering calculations of the viscosity of disperse systems is carried out. An analytical consideration of the effects of the particle shape on the calculation of the groundwater viscosity using the representations of particles of dispersed media as hydrodynamic dipoles is proposed. An equation for the viscosities of disperse systems is obtained with the determination of the shape factor of solid particles in a liquid. The comparison with the ratios for calculating the viscosity of ideal groundwater consisting of particles of a circular configuration indicates the possibility of reducing errors in calculating the coefficients of permeability of flow rates and pressures of filtration currents in underground horizons under the fluences of hydraulic structures. To improve the reliability of building structural elements operation of spillways without vacuum dams, a method of refined calculation of the dynamic effect of groundwater on the base of spillway dams and dams of the river bed is proposed.
Evaluation of the survivability of metallic elements in local damage given the beyond design basis effects
Authors: Sorokina Elena , Leonova Anna
Published: December 2018

The questions of ensuring the survivability of structural elements of buildings taking into account beyond-design effects, as well as the need to assess their loading under conditions of possible local damage are considered. This paper shows an energy algorithm for the study of physically nonlinear formulation of damaged objects, taking into account the features of finite element analysis of the bearing systems. The essence of the proposed approach is given by the example of a material point resting on a spring with nonlinear stiffness. The efficiency of this technique is tested on the example of a four-span beam. The method of determination on the basis of finite-element analysis of the maximum load of construction systems under beyond-design influences with regard to the physical nonlinearity of deformable objects is developed. The recommendations on the use of the given computational scheme in assessing the survivability of metal structural elements with possible local damage are given.
About dependence of parameters of internal explosion on the device of safety designs in apertures of the protecting walls of the production and residential buildings
Authors: Gorev Vyacheslav
Published: December 2018

Protection of buildings against consequences of gas explosion indoors by means of the safety designs (SD) is widespread. In a number of the regulating documents requirements to these designs are imposed. It agrees, the regulating documents are allowed to carry out calculation of system of protection against internal explosion by means of the safety designs. The key sizes determining the area of apertures of the blocked safety designs are: speed of explosive combustion, most allowed explosion pressure, unit weight (per acre) the safety designs and pressure of opening of the safety designs. Under pressure openings it is meant pressure with which communications of the safety designs with walls of the building collapse and the safety designs starts moving. Depth of seal of the safety designs in an aperture remains out of sight and is supposed what influences the end result a little. In the real article an attempt to deal with this question is made. As a result of the conducted researches it was established that depth of seal of the safety designs in an aperture has to be considered when calculating system of protection of buildings against internal explosion by means of the safety designs. Especially it is important for rooms of small volume of V0≤120 of m3. For the analysis of explosion in the production buildings it is necessary to consider the volume of these rooms and a possibility of increase in burning rate because of existence of barriers indoors.
The kinetic parameters of aerosols formed during combustion of modified wood
Authors: Portnov Feodor
Published: December 2018

The paper studies kinetic properties of aerosols formed in thermal degradation of wood. The impact of modifying agents in wood surface layer on the quantitative composition of smoke aerosol solids was analyzed. For this purpose, grain-size of aerosol solids was analyzed, and the physical and chemical properties of source and modified wood were assessed.
Features of calculation and design of complex concrete monolithic slabs
Authors: Kuznetsov Vitaly , Shaposhnikova Yulia
Published: December 2018

In the article features of designing of reinforced concrete floors on the profiled flooring, leaning against steel I-beams are considered. Specific features of calculating the strength of composite slabs in accordance with JV 35.13330.2011 “Bridges and pipes” and SP 266.1325800.2016 “Structural concrete structures. Design rules”. A method for determining the forces based on the real ratio of the rigidity of the overlap elements is also considered. The analysis of the results of the numerical experiment made it possible to establish the optimum coefficients of the use of materials that can be used in the design of combined overlaps.
Fire-protection of wooden structures by modification in a thin surface layer
Authors: Pokrovskaya Elena
Published: December 2018

The mechanism of fire protection of wood by the modification of a thin surface layer with organophosphorus compounds has been studied. The properties of the modified thin surface layer were studied by X-ray spectral analysis, IR spectroscopy and differential thermal analysis. Promising wood modifiers have been identified and the conditions for effective fire protection of wooden structures with organophosphorus compounds in a thin surface layer have been determined.
Estimation of cracking of reinforced concrete load-bearing construction structures at the stage of their technical inspection
Authors: Malakhova Anna
Published: December 2018

The article describes the process and causes of cracking of bearing reinforced concrete structures, revealed during the inspection of the technical condition of structural elements of buildings at the stage of their erection, at the stage of suspended construction and in the operational stage. The reasons for the appearance of cracks in reinforced concrete structures under force loads and climatic influences are analyzed. Possible reasons for the appearance of cracks in a monolithic reinforced concrete beam ceiling of a multi-storey building of a column structural system and in monolithic walls of an underground cylindrical reservoir, identified by the author of the article when inspecting the technical condition of these structures, are given. The relationship between the appearance of destructive cracks and the design errors of a monolithic reinforced concrete beam ceiling is shown. The complex nature of the causes of the appearance of cracks in the monolithic walls of the underground reservoir is revealed. The article describes the capabilities of the LIRA-CAD software package for determining the pattern and parameters of fracture-formation of reinforced concrete structures for subsequent comparison with the results of an inspection of the technical condition of structural elements of buildings and structures.
A mathematical model for the calculation of the thermal regime of the underground tunnel
Authors: Titkov Dmitriy , Yarkov Ilya
Published: December 2018

This paper deals with the problem of creation and sustenance of the thermal conditions of underground tunnel. Thermal conditions deal a great impact on the engineering communications work, electical cables conductivity and heat loss of the heat supply system. Suggested mathematical model allows to calculate the required thermal conditions of the underground tunnel and to predict it–s change over time, depending on the season of the year and temperature of the supply air.
Justification of the air separation curve
Authors: Sharapov Rinat
Published: December 2018

The article considers a method for increasing the production efficiency of fine powders. It is shown that modern air separators do not have high efficiency. A method for increasing the efficiency of air separators is proposed. It is noted that the main characteristic of the separation process is the separation curve, with the help of which a dispersed composition of fine and coarse products can be found. The calculation is made taking into account the turbulent diffusion of separation air in the casing of the air separator, and also the constructive features of the separator in question. The separation function is proposed taking into account the proposed technical solution.
Experimental studies of the transporting capacity of the pipe textured relief trays
Authors: Orlov Vladimir , Dezhina Irina
Published: December 2018

The article presents an analysis of theoretical approaches to assessing the gravity pipeline efficiency in the transportation of water containing suspended solids (the sand). The attention is focused on application of the pipeline protective coatings used in their trenchless repair. Provision has been made of studying the problems of the removal of caked deposits on the pipe walls by creating a special pipeline textured inner surface, representing some kind of a relief, which favors the forced effect of flow turbulence in combination with the hydrophobic properties of the pipeline inner surface. The article presents the results of the research works on the creation of small-size hydraulic benches, which allow determination of the degree of the flow hydrophobicity and the transporting capacity along various textured surfaces (the pipeline protective coatings). The article describes the methods of work on the benches, types of obstacles and the nature of their arrangement along the length of the tray. Provision has been made of different options of the pipeline surface relief further improvement. The photo and film fixation, as well as the black-and-white shadow effects, have enabled presentation of the results of full-scale research experiments on the removal of various size suspended solids from the pipeline tray part. The micro-turbulence phenomena depending on the height of obstacles and their location have been described. The prospects and practical significance of the works aimed at improving the flow transport capacity have been assumed.
Six types of enclosing structures for low-storey houses. Economic comparison
Authors: Ibrahimov Alexander , Vechtomov Pavel , Andreeva Peraskovya , Popova Aleksandra
Published: December 2018

The article represents comparative economic analysis of 6 types of enclosing structures for low-storey houses. They are: masonry, foam concrete blocks laying, glued laminated lumber, timber frame construction, light-weight steel thin-walled framing, glued veneer panel. The last one distinguishes of a high factory readiness level, allow using nonconforming veneer in its compound, may contain underlining depending of the exact region. Analysis was carried out using five-grade scale in several groups of parameters, such as: physical characteristics, building conditions, extra works if needed and maintainability, economical characteristics, probability rate. The results obtained maid it possible to recommend glued veneer panel for universal application.
On Deformability of Crane Metallic Structures
Authors: Vershinsky Anatoly , Shubin Aleksandr , Masyagin Aleksander
Published: December 2018

Problems of metallic crane structure deformability are considered. This paper contains results of experimental studies on deformability of overhead crane beam elements. These studies take into account the specific interaction between stresses arising from the product’s exposure to loads at various stages of its life cycle, from manufacturing to operation, and residual welding stresses. Recommendations are provided to help stabilize the dimensional parameters of a crane metallic structure.
Software analysis for the hydraulic calculation of storm-water drainage gravity-flow networks comprising electronic model development
Authors: Gromov Grigory , Ten Andrey , Khudyakova Darya
Published: December 2018

In accordance with the Resolution of the Russian Federation Government N 782 “Concerning the Development of Water Supply and Wastewater Disposal Systems”, the development of surface run-off disposal systems comprising the electronic model, is a topical issue for the design and operation of wastewater disposal systems for the Russian settlements. In this context, the software used must provide making the hydraulic calculations for the gravity-flow systems of storm-water drainage networks. [1].

The analysis of Russian software [2-4] revealed the impossibility to develop electronic models and to make hydraulic calculations for the gravity-flow networks of storm-water drainage systems. In this connection, the possibilities offered by the foreign software products, which electronic models make it possible to carry out the required hydraulic calculations and to design surface run-off disposal systems, were studied [5,6]. This article contains the analysis of the European document BS EN 752:2008 [7] with regard to determining the flow of surface (storm-water) run-off, as well as the calculations made by the authors, which reveal that foreign software products are not applicable in Russia. Nevertheless, for the development of the electronic model for the hydraulic calculation of a storm-water drainage system, some mathematical relationship was found that most adequately characterizes the type of surface run-off hydrograph, most typically occurring on the territory of the Russian Federation in cases of atmospheric precipitation fallout. This relationship comprises the application of the RTK hydrograph method.
Elimination of polluting nutrients from wastewater
Authors: Zaletova Nina
Published: December 2018

Results of long time of experiments of phosphorus and nitrogen removal technology from municipal wastewater conducted in laboratory and on few pilot industrial plants are described. Peculiarities of chemical method of phosphorus removal and advantages of biological method of phosphorus removal, including further utilisation of phosphorus as a fertiliser are observed. New approach for nitrogen removal, based on usage of immobilised microorganisms is discussed
Digital Models In Construction: Classification Paradigm
Authors: Volkov Andrey
Published: December 2018

The new tasks of the country’s development determine the special significance of the academic and professional community of the construction industry in deep understanding and active participation in the processes of traditional transformation and the formation of new areas of competence. Creation, facilities and infrastructure, urban environment – become today a main area of intersection and concentration of high-tech areas of scientific progress. The article considers an original scheme of system engineering for digital modeling of creative activity are presented. Within the framework of the scheme, seven levels of digital modeling, corresponding to six levels of aggregation of links: «plan» – «goal», «object» – «project», «process» – «time», «technology» – «economy», «system» – «resource», «complex» – «convergence» are described.
Plasticity and Creep of Materials at Variable Stresses
Authors: Andreev Vladimir , Urumov Georgy
Published: December 2018

The article deals with the modeling of elastic-plastic behavior and creep of aluminum alloys. On the basis of the treatment of equilibrium stretching diagrams and creep curves, nonlinear dependences describing the phenomena under consideration are constructed. A feature of the paper is the consideration of the creep process under varying stresses, when the growth of deformations in time is accompanied by stress relaxation.
Piecewise continuous approach to nonlinear differential equations approximation problem of computational structural mechanics
Authors: Leibov Roman
Published: December 2018

This paper presents a nonlinear differential equations system piecewise continuous approximation. The piecewise continuous approximation improves piecewise linear approximation through reducing the errors at the boundaries of different linear differential equations systems areas. The matrices of piecewise continuous differential and algebraic equations systems are estimated using nonlinear differential equations system time responses and random search method. The results of proposed approach application are presented.
Dynamic force analysis of a six-link planar mechanism
Authors: Umbetkulov Yertugan , Yeleukulov Yerlan , Atalykova Alfiya , Smailova Gulbarshyn , Iskakova Gulmira , Zhauyt Algazy , Ibrayev Gulama-Garip Alisher
Published: December 2018

In this paper is studied a vibratory conveyor that is placed on an elastic base. Using the closed contours method it was determined the system that needs to be solved to obtain graphical representation for the generalized coordinates determining the position of the mechanical system elements. The shaking conveyor represents the chase hanged or supported to the fixed section. The chase commits oscillating motions hereupon the cargo which is in the chase, migrates concerning to the chase. The nature of the flow and its parameters are determined by the nature of the oscillating committed by the chase. Installation causes fluctuations fixed tray. Uniformly distributed load on the tray acts in each element of the mechanism. A proper dynamic model has been developed within MSC ADAMS and Maple 18. Simulation tests have been carried out and results are discussed to validate the proposed design solution.
Calculation of wooden beams reinforced with polymeric composites with modification of the wood compression area
Authors: Roschina Svetlana , Gribanov Alexey , Lukin Mikhail , Lisyatnikov Mikhail , Strekalkin Artem
Published: December 2018

Peculiar features of engineering and numerical calculations of wooden beams reinforced with polymeric composites with the local modification of the wood compression area under an insufficient volume of the initial data have been considered in this article. A technique for determining the physical and mechanical properties of materials and a stress-deformation diagram based on experimental investigation has been described. The enlarged algorithm of engineering calculation on the enumerated geometrical characteristics and numerical calculation by the consecutive loading technique and with correcting of the tangent modulus of elasticity at each step instantiated in PC Lira 10.6 has been presented. Analysis of the stress-strain state of wood-composite beams with local modification of wood has been made. Comparative analysis of engineering and numerical calculations has been performed within the limits of the calculated load. Conclusions on the results of theoretical investigations of the proposed beam construction have been formulated and compared with the existing investigations in the field of reinforcement of beam constructions with polymeric composites.
Comparison of the stress-strain state of the reinforced concrete structure under various mathematical models of concrete
Authors: Sidorov Dmitriy , Dorozhinskiy Vladimir
Published: December 2018

Nowadays, reinforced concrete structures are most often used as load-bearing elements of buildings and structures. In the case of alternating loads such as seismic action, there is accumulation of residual plastic deformations in the concrete structures, which leads to a significant complication in the calculation of structures by “standard” methods. For such problems, it is advisable to use computational complexes in which mathematical models of structural materials are implemented, which allow to describe the work of concrete and reinforcing bars for various types of impacts more properly. However, when applying such methods, the results obtained should not contradict the requirements of the existing regulatory documents, which, in the first place, the structural engineer should be guided by. Before solving more complex problems, the applied methods should be verified and analyzed for fairly simple structures and types of loads.
The research of dynamic impacts on the hydraulic structure foundation base, transformed in the process of accident recovery
Authors: Ter-Martirosyan Zaven , Luzin Ivan
Published: December 2018

The article presents the results of a comprehensive research of the dynamic impacts on a modified base. The modified base was obtained as a result of compensatory injection at the experimental site for the accident recovery at the hydraulic engineering structure. The complex study of the dynamic impacts includes special laboratory tests to determine the soil parameters, the finite element analysis of the experimental site, taking into account the dynamic properties, the selection of the necessary equipment for field experiments based on the numerical solution results, a full-scale experiment with the measurement of the foundation sediments of the experimental site.
Probabilistic approach to the investigation of the causes of emergencies at the gas pipeline facilities
Authors: Orlov Victor , Detina Elena
Published: December 2018

When developing any technical process, there is a problem of its safety. The solution of these problems is an integral part of such a process. In this work we study the modeling of the dynamics of cause-effect relationships of the origin of accidents at the gas pipeline facility. Publications have been analysed on the solution of the security problem at the gas pipeline facilities, approaches to solve this problem, efficiency of practical implementation on the production site. Based on the analysis, positive aspects of the existing developments were taken into account, and also general significant shortcomings were revealed. This study proposes improvements of security solutions based on the probabilistic approach, allowing the use of quantitative and qualitative criteria in the algorithm of the prevention of security measures and obtaining the possibility of the prevention of emergency situations on gas pipeline objects. The obtained results can be adapted to other branches of production.
Influence of the new construction to settlement of historical building when accounting hardening of medium sand in basement
Authors: Chunyuk Dmitriy , Rasskazova Daria
Published: December 2018

Currently, a number of difficulties arise in the construction of dense urban areas, as well as in the reconstruction and superstructure of existing buildings and structures. Often when carrying out geological scene investigation, it is not possible to determine the strength parameters of the soil directly under the foundation. In most cases, this leads to understating of its characteristics, which is reflecting in the excessive economic costs resulting from the need to strengthen the existing building structure. However, in many situations, this can be discarded, justifying it by calculations. In this paper is shows the performed series of numerical experiments and were analyzed the changes of existing building foundation settlements, taking into account its long-term exploitation in assessing the impact of new construction. The base had defined by a single-layer half-space with a limited depth of deformation zone and composed of medium-sized sand. PLAXIS 2D software was chosen to create the calculation model. When processing the results, it was possible to identify a certain dependence that allows estimating the maximum settlement of existing building in the impact assessing from new construction taking into account the duration of building operation. The obtained data prove the necessity to take into account the change in strength properties of soils caused by long-term loads action of structures.
Tsunamis in the East Sea and damages to the coastline of Vietnam
Authors: Kantarzhi Izmail , Nguyen Hai Hoa
Published: December 2018

According to field surveys as well as data recorded in text documents, it can be said that Vietnam has historically been hit by a tsunami. However, we still do not have enough information to accurately determine the destructive power of these tsunamis against the coastal line of Vietnam. On the other hand, in the South China Sea, there are four potential earthquakes that could lead to tsunamis affecting coastal line of Vietnam. Using models, tsunami simulations as well as computing algorithms, experts say that tsunamis will appear and attack coastal line of Vietnam when there are submarine earthquakes with magnitude of larger than 7 at the fault along Central Asia shelf with an earthquake with magnitude of greater than 8 at the Manila Trench. If an earthquake of magnitude 8 occurs in the south of Hainan, the tsunami impacting coastal line of Vietnam will be greater than 2 m. If an earthquake of magnitude 8 occurs in Manila, the tsunami from Da Nang city to Quang Ngai will reach 4 m. From there we can see that the risk of tsunami occurring and attacking the coastal cities of Vietnam is there, although the probability is not high.
Mechanical behavior of ballasted railway track stabilized with polyurethane: A finite element analysis
Authors: Khakiev Zelimkhan , Kruglikov Alexander , Lazorenko Georgy , Kasprzhitskii Anton , Ermolov Yakov , Yavna Victor
Published: December 2018

Analysis of mechanical behavior of ballast shoulder of railway track reinforced by polyurethane binding agent has been performed by the method of finite-element simulation Limitation of the model of linear-elastic properties of geocomposite has been displayed. Dependence of elasticity modulus of geocomposite on deformation value has been suggested. Influence of penetration depth of polyurethane binding agent on behavior of railway track construction under different train loads has been studied.
New computer technologies, analysis and interpretation of geodata
Authors: Taranchuk Valery
Published: December 2018

The article discusses the problems of development, tool filling, and usages of the integrated program complex of the composer of digital geoecological models. Possibilities of adapting of digital models, interactive graphics visualization, and comparison of results are marked.
Determination of pressure in the near-ground space pile terminated and broadening of the surface
Authors: Kupchikova Natalia
Published: December 2018

The article deals with the problem of determining the stress state of a complex pile structure with end broadening in the form of a sphere in the soil mass in the analytical form by a discrete method. The calculation schemes for determining the stress tensor at the boundary of the pile of square and circular cross-section with expansions in the soil massif are shown. The elements of the polynomial are found by the discrete method in rectangular and spherical coordinates, which is a cumbersome complex mathematical apparatus for a modern design engineer. The stresses are determined. At present, as the analysis has shown, the solution of complex geotechnical problems of soil bases and foundations for different types of loads in numerical modeling is carried out using modern software. Numerical modeling and calculation with the help of specialized software systems allows to consider the system “building-foundation-ground foundation”, as dynamic, integrally developing. However, the interaction of the components of this system requires a theoretical justification of the resistance of foundations in the ground environment, especially in complex engineering-geological conditions.
Organizational-technological decisions in construction based on neural network models
Authors: Zharov Iaroslav
Published: December 2018

Increasing the quality of organizational and technological solutions in construction is one of the main tasks facing the construction industry. The actual methods of solving the problem of setting organizational and technological design are directly related to the integration of specialized software in the planning and design of construction projects, especially for unique, complex projects, projects implemented in tight time and construction sites in the current urban development. The existing need to process a significant amount of information at short intervals and to link design decisions to the dynamic environment of the construction site is not an easy task, but a realizable one. Within the framework of the research work carried out at the department of MGSU, the expediency of applying operational assessments of the parameters of organizational and technological solutions based on mathematical methods has been established. The proposed method for forecasting and evaluating the integral parameters of design solutions is based on a neural network model, the method used involves the formation of a training matrix comprising key indicators of implemented (pilot) ones.