bluuebunny/crossref_metadata_2025 huggingface dataset:
Dramatic enhancement in pH sensitivity and signal intensity through ligand modification of a dicobalt PARACEST probe
Authors: Thorarinsdottir Agnes E. , Harris T. David
Published: December 2018

A ratiometric dicobalt PARACEST pH probe that exhibits dramatic enhancements in sensitivity and signal intensity over analogous probes is reported.
Incremental NH stretching downshift through stepwise nitrogen complexation of pyrrole: a combined jet expansion and matrix isolation study
Authors: Oswald Sönke , Suhm Martin A. , Coussan Stéphane
Published: December 2018

The NH stretch of pyrrole experiences downshifts when expanded with N2 or embedded in pure/mixed N2 matrices, no blueshift.
Magnetic order and enhanced exchange in the quasi-one-dimensional molecule-based antiferromagnet Cu(NO3)2(pyz)3
Authors: Huddart Benjamin M. , Brambleby Jamie , Lancaster Tom , Goddard Paul A. , Xiao Fan , Blundell Stephen J. , Pratt Francis L. , Singleton John , Macchi Piero , Scatena Rebecca , Barton Alyssa M. , Manson Jamie L.
Published: December 2018

The magnetic properties of Cu(NO3)2(pyz)3 demonstrate ideal one-dimensional Heisenberg antiferromagnetic behaviour owing to the local environment of Cu2+ ions.
An introduction to zwitterionic polymer behavior and applications in solution and at surfaces
Authors: Blackman Lewis D. , Gunatillake Pathiraja A. , Cass Peter , Locock Katherine E. S.
Published: December 2018

Zwitterionic polymers, including polyampholytes and polybetaines, are polymers with both positive and negative charges incorporated into their structure.
Fluorescence lifetime-activated droplet sorting in microfluidic chip systems
Authors: Hasan Sadat , Geissler David , Wink Konstantin , Hagen Axel , Heiland Josef J. , Belder Detlev
Published: December 2018

We present a highly efficient microfluidic fluorescence lifetime-activated droplet sorting (FLADS) approach as a novel technology for droplet manipulation in lab-on-a-chip devices.
Correction: Scalable synthesis of one-dimensional Na2Li2Ti6O14 nanofibers as ultrahigh rate capability anodes for lithium-ion batteries
Authors: Wang Chao , Xin Xing , Shu Miao , Huang Shuiping , Zhang Yang , Li Xing
Published: December 2018

Correction for ‘Scalable synthesis of one-dimensional Na2Li2Ti6O14 nanofibers as ultrahigh rate capability anodes for lithium-ion batteries’ by Chao Wang et al., Inorg. Chem. Front., 2019, DOI: 10.1039/c8qi00973b.
Ribavirin-induced down-regulation of CCAAT/enhancer-binding protein α leads to suppression of lipogenesis
Authors: Satoh Shinya , Onomura Daichi , Ueda Youki , Dansako Hiromichi , Honda Masao , Kaneko Shuichi , Kato Nobuyuki
Published: December 2018

Recently, we demonstrated that the anti-viral drug ribavirin (RBV) had the ability to suppress lipogenesis through down-regulation of retinoid X receptor α (RXRα) under the control of the intracellular GTP-level and AMP-activated protein kinase-related kinases, especially microtubule affinity regulating kinase 4 (MARK4). RXRα-overexpression attenuated but did not abolish lipogenesis suppression by RBV, implying that additional factor(s) were involved in this suppressive effect. In the present study, we found that the protein level, but not the mRNA level, of CCAAT/enhancer-binding protein α (C/EBPα) was down-regulated by RBV in hepatic cells. Treatment with proteasome inhibitor attenuated RBV-induced down-regulation of C/EBPα, suggesting that RBV promoted degradation of C/EBPα protein via the ubiquitin–proteasome pathway. Depletion of intracellular GTP through inosine monophosphate dehydrogenase inhibition by RBV led to down-regulation of C/EBPα. In contrast, down-regulation of C/EBPα by RBV was independent of RXRα and MARK4. Knockdown of C/EBPα reduced the intracellular neutral lipid levels and the expression of genes related to the triglyceride (TG) synthesis pathway, especially glycerol-3-phosphate acyltransferase, mitochondrial (GPAM), which encodes the first rate-limiting TG enzyme. Overexpression of C/EBPα yielded the opposite results. We also observed that RBV decreased GPAM expression. Moreover, overexpression of GPAM attenuated RBV-induced reduction in the intracellular neutral lipid levels. These data suggest that down-regulation of C/EBPα by RBV leads to the reduction in GPAM expression, which contributes to the suppression of lipogenesis. Our findings about the mechanism of RBV action in lipogenesis suppression will provide new insights for therapy against the active lipogenesis involved in hepatic steatosis and hepatocellular carcinomas.
Piercing the lipid raft: the case of Vibrio cholerae cytolysin
Authors: Cyr Normand
Published: December 2018

In a recent issue of Biochemical Journal, Kathuria et al. [Biochem. J. (2018) 475, 3039–3055] report that membrane binding of the pore-forming toxin Vibrio cholerae cytolysin (VCC) is facilitated by the presence of cholesterol, and the presence of this sterol within the lipid bilayer is key for the formation of a functional pore. Yet, in the presence of accessory non-lipid components, VCC retains its membrane-binding capability likely through membrane lipid raft structures. In light of their results, the authors provide new insights into the roles of cholesterol and of membrane microstructures in the binding, the oligomeric assembly and the cytolytic pore formation of VCC which all take place following infection by V. cholerae.
Insulation systems for buildings and structures based on expanded polyethylene
Authors: Semenov Vyacheslav , Kozlov Sergey , Zhukov Alexey , Ter-Zakaryan Karen , Zinovieva Ekaterina , Fomina Ekaterina
Published: December 2018

Insulation systems for buildings and structures imply the use of efficient thermal insulation products based on mineral wool, expanded polystyrene, expanded polyurethane, etc. For a long time, products from non-cross-linked expanded polyethylene were used as insulation for pipelines, reflective insulation, protection against air infiltration, etc. Modern technologies and engineering solutions allowed widening the field of application of non-cross-linked expanded polyethylene (NXLPE) as a construction insulation material. In particular, we can consider a complex of insulation systems for walls, floors and a pitched roof, which allows to form a fully insulating shell of a low-rise building, e.g. a cottage. The novelty of the patented technology Tepofol® and that of the material concerned in comparison with the known solutions is the development of a rolled material based on NXLPE (20 to 150 mm thick) with a lock joint, as well as the technology of seamless connection of individual heat-insulating cloths. The rolls of NXLPE are mechanically fixed to the frame and connected with the lock. One of the advantages of expanded polyethylene, which only few insulating materials possess, is the possibility of forming seamless insulating shells. The article considers a number of insulation systems based on the use of products from expanded polyethylene. In particular, these are the systems of insulation of the walls of frame buildings, the insulation of floors, as well as the insulation of logistics facilities and hangars.
The decline of combustibility of heat-insulating composite plates from plant wastes
Authors: Ibragimov Alexandr , Titunin Andrey , Vachnina Tatiana , Susoeva Irina
Published: December 2018

The structure and factors of the process of production of heat-insulating composite plate materials from the waste of spinning of plant fibers are being developed. A disadvantage of the cellulose-containing filler composites is their increased flammability. The stages of thermal destruction of cellulose are considered. To determine the characteristics of the material that affect their fire hazard properties, the differential scanning calorimetry method was used. The paper substantiates the use of the method of introduction of fire retardant at the stage of formation the structure of composite. To reduce the flammability of composite materials from plant raw materials, it was suggested to use ammonium fluoride. The results of the determination of the degree of damage by mass in the case of burning in a “ceramic combustion chamber” of samples of a composite material with filler from irrecoverable waste produced by cotton and linen fibers are obtained. It has been established that the use of ammonium fluoride for the manufacture of heat-insulating composite plate materials from the irrecoverable waste produced by cotton and linen fibers makes it possible to obtain material with a degree of damage by mass of not more than 22 %. Key words: cotton, flax, spinning waste, cellulose, thermal destruction, differential scanning calorimetry, composite materials, loss of mass in combustion, ammonium fluoride.
Optimal control time evaluation for “dry DSM” soil-cement composites
Authors: Kiecana Monika , Kanty Piotr , Łużyńska Klaudia
Published: December 2018

Soil improvements with hydraulic binders are a widespread practice in foundation works. They vary depending on the mixing method (jet grouting hydraulic, deep soil mixing -mechanical), medium type (wet/water, dry/air) and binder type (cement, lime, fly ash or mixtures). The produced component’s strength changes in time thus its control should change in time as well. The paper presents the results of laboratory testing of an organic soil component mixed in dry method. The process of samples preparation and testing methodology of compressive strength and stiffness is described. Volatility of the parameters in time is considered. On the basis of the results, recommendation for optimal quality control time and its methodology for soil-cement components might be proposed.
Feasibility study of the utilization of waste basalt rebars as fibre reinforcement for concrete
Authors: Kowalik Tomasz , Logoń Dominik , Ubysz Andrzej
Published: December 2018

Composite materials have been gaining increasing popularity in many industries, such as: the automotive industry, aviation, electrotechnics and construction. Due to the widespread use of composites the problem of their utilization and reuse arises. This paper presents an attempt to utilize basalt discards as fibre reinforcement for concretes.
Structure and properties of masonry mortars based on ceramic microspheres
Authors: Semenov Vyacheslav
Published: December 2018

Modern requirements in the field of energy and resource saving determines the need to apply effective fencing structures. To ensure the thermal homogeneity of the structures erected with small-piece masonry elements (ceramic and light-weight concrete units etc.), it is necessary to use lightweight mortars. One of the most effective methods to obtain such mortars is the introduction of hollow ceramic microspheres as a filler into their composition. The purpose of this work is studying of the composition and structure of a cement masonry mortar with hollow ceramic microspheres and modifying additives in correlation with its properties. The methods of thermogravimetric analysis, scanning electron microscopy, X-ray diffraction and standard test methods for the masonry mortars were used. The effect of the structural characteristics of the composite on the properties of final product was analyzed. It is established that the microstructure of the modified mortar samples is more compact in compare with basic composition, and the surface of the microspheres is covered by the products of the chemical interaction of its walls with the cement matrix. The aforesaid research allowed to obtain the high-performance lightweight mortars with hollow ceramic microspheres.
Effect of basalt fibres on the parameters of fracture mechanics of MB modifier based high-strength concrete
Authors: Kharun Makhmud , Koroteev Dmitry
Published: December 2018

Basalt fibres (BF) are increasingly studied in structural applications due to its environmental friendliness and good mechanical properties. Mass production of high-strength concrete (HSC) in Russia is mainly associated with the use of organomineral modifiers of the MB series, containing in their composition microsilica, fly ash, hardening regulator and superplasticizer C-3 in different ratios. In our study we produced HSC specimens (without BF, and with 1 wt.% chopped BF) using the modifier MB10-30, with the dimensions of 100x100x100 mm, 100x100x400 mm, 100x100x400 mm with the artificial crack of 25 mm deep in the middle of the span, and also 100х75х400 mm (75 mm height was taken equal to the height of the section above the crack of the 2nd type of prisms). The compressive strength, the tensile strength at bending, the strength at axial tension, the cracking moment, and also the parameters of fracture mechanics, such as: the critical stress intensity factor and the critical energy release rate, at the curing periods of 7, 14, 28, 60 days, have been determined. We also evaluated the influence of crack in the bend element on the value of the cracking moment. The results showed that the inclusion of BF in MB modifier based HSC resulted in a decrease in the compressive strength, however, significantly enhanced its flexure behavior.
Algorithm for calculation of channel deformation in soils of various graininess
Authors: Hodzinskaya Anna
Published: December 2018

The article deals with deformations of channel beds in of various-grained, non-cohesive, rather coarse-grained soils having more than 0.55 mm mean diameter of particles that might form natural pavement at velocities slightly higher than non-erosive ones. Laboratory experiments prove that as soon as natural pavement has formed, modelled bed deforms only a little. Is proposed scheme of calculation of parameters of the channel and the channels deformation. The bed should be erosion normally of the slopes. To estimate the time of deformation is proposed to use for the flow of the bottom sediments of probabilistic formulas, based on a model of K. I. Rossinskii. To determine the diameter of armoring and depth of erosion of the riverbed of the proposed new method of calculation that gives the values close and experienced and method of A.V. Magomedova. Is given block diagram of the calculation riverbed in a non-uniform particle size. Channels sizes you can define by setting a slight excess permissible velocities, or you can take specified values. There is good agreement between the values of erosion obtained in the experiments and in the calculations. In the presence of the surface layer of the slope or the ballast layer of geotextile of various-grained of a certain thickness may be formed armoring, capable of protecting the slopes of the channel from erosion.
CAD in interdisciplinary integration as a tool to increase specialist training quality in “Construction” education
Authors: Bedov Anatoliy , Gabitov Azat , Gaisin Askar , Salov Aleksandr , Chernova Anastasiia
Published: December 2018

Subject: subject of research is characterized by the requirement to master and efficiently apply CAD tools in the teaching process for analyzing reinforced concrete structures and engineering of facilities to be built under current construction standards and regulations.

Objectives: consideration and analysis of updated software applications for simulation enabling to reduce academic load and improve process of education for less period of time. Methods of teaching such subjects as “Reinforced concrete and masonry structures” and “Construction engineering” are improving together with updating of simulation software, meaning consideration of the process for problem solving in calculations, engineering and mounting of reinforced frame elements to one-storey industrial facilities.

Materials and methods: scientific papers by authors of this work were used as reference literature, the article methodology is based on standards of objectivity and development, statistical level of methodological analysis was applied.

Results: comprehensive description for getting modern IT learning skills in using software simulation facilities was prepared under analysis of the below mentioned materials. Problems in making 3D simulation model of a frame of a building considering facilitation for the students in their appreciation and maximum approach to actual behavior of structures were reviewed either. In the course of analysis a number of assumptions was proposed for engineering of connection between bearing elements of the frame and statistical estimation in linear statement.

Conclusions: bases for calculation, engineering and mounting of reinforced concrete structures were considered therewith in accordance with present norms and regulations. Currently a problem in making simulation algorithm for 3D calculation scheme of standard frame to one-storey industrial facilities is still very important.
Cross section structure influence to deformation of construction at accidental impacts
Authors: Kolchunov Vitaly , Androsova Natalia , Savin Sergey
Published: December 2018

In this paper, results of numerical investigations of prefabricated RC structural systems, in particular influence to deformation at sudden bearing element removal it cross section, node links, reinforcement scheme and prestressing, are presented. It is shown, that it is possible to increase structural safety varying these parameters. Structural decisions of prefabricated elements, its nodes, recommendations for prestressing, which provide resistance against progressive collapse, are proposed.
Particular aspects of calculating affecting factors of fireballs emerging from aircraft crash
Authors: Komarov Alexander , Gromov Nikolay
Published: December 2018

The article reveals an algorithm of calculating the heat loads which emerge during fireball-involving accidents. By way of illustration it considers a situation when a heavy aircraft crashes in the vicinity of a typical reactor building of a nuclear power plant. The given algorithm provides a quite detailed and accurate calculation of maximum heat load values that accompany the accident.
Modeling of construction waste processing system development
Authors: Oleinik Pavel , Kuzmina Tatyana , Zenov Viktor , Melnichuk Vitaliy
Published: December 2018

Construction waste is the most important source for reducing raw material resources. In this regard, many countries conduct large-scale research in developing progressive construction waste utilization technologies and creating highly efficient production equipment. Current experience in this field views the construction waste processing system as a number of interconnected subsystems: organizational and technical preparatory measures; waste collection and sorting; waste containerization, packaging and transportation; waste processing and manufacturing of recyclable resources. Each sub-system consists of a set of measures which characterize the change in material quality and properties. Modeling of the construction waste processing system addresses the task of assessing the actual level of the system and subsystems and determining the condition of the same within certain forecasted time perspectives. For this purpose, the cost vs. revenue comparison tools are used. To develop the construction waste processing system and maintain it in working condition it is important that, early on in the project, a waste classification catalogue and a relevant glossary of terms be compiled with all waste processing contractors having to agree to it and observe it. Also, a data bank containing all the relevant engineering and process documentation shall be drafted and maintained
Cold thread Forming – the chipless alternative for high resistant internal threads
Authors: Heiler Roland
Published: December 2018

In the area of construction and mechanical engineering the designers and production engineers very often do have the task to produce high resistant connections with the possibility of assembling and de assembling parts in a wide range of different materials. Most often connection bolts and internal threads are used to fulfill this task. To produce the internal threads typically the three following internal threading technologies are used: tapping, cold thread forming and thread milling. Tapping and thread milling are metal cutting technologies but cold thread forming is a chipless alternative. Due to the cold forming of the thread this process does have several benefits in comparison to the traditional cutting technologies, but also some special features and process characteristics have to be considered, that it is possible to produce reliable internal threads. In the article the technology is presented with information about the process characteristics, the modern tools design and typical application areas. Results of pull out tests are showing the possibility for producing high resistant threads.
The effect of ultrasound on the process of water softening
Authors: Vikulina Vera , Vikulin Pavel
Published: December 2018

The application of ultrasonic vibrations in natural water conditioning technology is part of the scientific problem of using in this field of knowledge of physical methods, which also include magnetic, high-frequency, x-ray, ultraviolet, etc. Currently, ultrasonic vibrations are widely used in various industries: metallurgy, chemical, mechanical engineering, medicine, etc. Quite a wide application of ultrasound is explained by the variety of phenomena occurring in the ultrasonic field. Ultrasonic vibrations initiate dispersion and emulsification of substances, contribute to coagulation and degassing, affect the processes of crystallization and dissolution; it is known that ultrasound causes a variety of chemical transformations of the substance, among which are reactions of oxidation, reduction, polymerization, etc. the Explanation of these phenomena is found in a variety of ultrasonic effects: cavitation, shock waves, microflows, acoustic wind, etc. The schemes of ultrasonic generators are continuously improved, works on the development of methods of using ultrasound and on the search for new areas of its application are progressing.
Determination of the aerodynamic characteristics of a concentrator with adjustable parameters
Authors: Sharapov Rashid , Agarkov Aleksandr
Published: December 2018

The paper considers a new type of dust-concentrator device. The scheme of this concentrator is presented. According to the design scheme of the concentrator, flows of particles of dusty air and changes in the velocities of the motion of air flows in it are considered. Based on this, the conclusion is made about the pressure in different sections of the concentrator.
Optimization of flat-oval pipes and perspectives of their application in core structures
Authors: Marutyan Alexander , Kobaliya Tamazi , Galdin Evgeny
Published: December 2018

The calculation of optimal parameters of flat-oval pipes is given by an approximate method, the correctness of which is confirmed by testing using standardized profiles. A new layout of gratings made of flat-oval shaped pipes is presented, developed for truss systems based on steel rod structures of coatings with replacement of bar-shaped bent elements with tubular ones. The caseless junctions of belts and lattices with direct joining of rod elements to each other without alignment are developed, as well as with structural eccentricities limited to 0.25 of the height of the waist elements, which allows not to take them into account in calculations and provides an increase in the degree of unification of the nodes of the upper and lower belts of carrier’s constructions. The prospects of using a new technical solution in light metal structures of buildings and structures are shown. The area of its rational application is outlined, where by means of variant design of typical, known and new solutions, a quantitative estimate of the reduction in the consumption of structural material is given. The whole diagram of changes in the design parameters of flat-oval pipes is shown in the transformation of their cross-sections from vertical configurations to horizontal ones, including the transition through the outline of a circular shape.
Influence of the iteration step size to finding solutions
Authors: Klochko Aleksey , Klochko Asmik
Published: December 2018

The article considers the issues of obtaining a network configuration by the criterion of maximizing the reliability index. The rationally designed configuration of the gas distribution network for the selected gas supply scheme ensures reliable operation throughout the life of gas pipeline. The results are recommended in designing of gas distribution networks, as well as when determining the reserve for improving the reliability of the network for the adopted gas supply scheme for subscribers.
Combined electromachine generators for energy-efficient mini-power plants
Authors: Zabora Igor
Published: December 2018

The design, principle of operation and features of new combined electric machine – generator-transformer unit (GTU) are considered. The units are designed for generating units of mini thermal power plants with extreme parameters of moving media (steam-gas, gas-liquid, etc.) at high pressure and temperature. The possibility of reliable and efficient conversion of electric power by means of electric machines directly in sealed objects with extreme environmental conditions with help of new GTU is shown.
On the mutual influence of local resistances in the distribution of ventilation air
Authors: Kashurkin Alexey , Prokhorov Vitaly
Published: December 2018

The article deals with various methods of reducing the interference of local resistances in ventilation networks, as well as the question of the uniformity of air distribution on the branches. A critical assessment of the method of coarsening calculations used in practice is given, which is expressed in the fact that the reference coefficients of local resistances are simply summed up without taking into account the influence of local resistances on each other. It is proposed to use rectifying devices as a method of reducing the interaction of local resistances. The method of determining the length of the honeycomb jet rectifier necessary for the alignment of the velocity field of the flow is given. The use of flow dividers for the uniform distribution of the air flow through the branches is also considered, the system with flow separators is calculated and its pressure losses are compared with a similar system without flow separators.
Principles of Sustainable Infrastructure Formation in Research and Technology Development Centers Construction
Authors: Pustovgar Andrey , Medvedev Vyacheslav , Adamtsevich Aleksey , Popović Zdenka J.
Published: December 2018

The paper concerns the issue of infrastructure formation in research and technology development centers. It is established that the key point in the design and construction of such centers is providing the effective functioning of social infrastructure, which is a connecting link for the main structural elements of modern research and technology development centers. The grounds for the necessity of working out a unified pattern for designing research and technology development centers in compliance with the urban planning regulations and research and technology development priorities are given. An integrated model for working out a unified pattern of designing research and technology development centers is suggested. This model envisages creating a harmonized international standard that describes the basic principles of sustainable infrastructure formation in research and technology development centers construction. Based on the research results, the principles of sustainable infrastructure formation in research and technology development centers are set out and worded according to the goals of sustainable development. The authors also give grounds for the applicability of the principles formulated in this paper for the infrastructure assessment of research and technology development centers, both operating and under construction, which will make it possible to target the less-developed elements and draw up the plan of their improvement for further sustainable development. The authors also list emerging technologies to be developed and implemented for the efficient accomplishment of the research objectives.
Interaction of the base and construction under seismic action, with considering various characteristics of soil damping
Authors: Sobolev Evgeny , Ter-Martirosyan Armen
Published: December 2018

In this paper, we determine the characteristics of the physical damping of sand and clay soil by the results of special laboratory tests. The transition from parameters obtained directly from the results of triaxial dynamic tests to parameters of mathematical models of soils used in modern software complexes is shown. The solution of several dynamic FEM problems is exemplified by PLAXIS PC taking into account different damping characteristics of the ground base of a multi-storey building with a developed underground part. Recommendations are given for selecting a soil model for dynamic impact and dynamic soil parameters, and an analysis of the solutions obtained.
Verification of the reinforced concrete column bar model based on the test results
Authors: Mkrtychev Oleg , Dudareva Marina , Andreev Mikhail
Published: December 2018

Modern software packages for calculating buildings and structures for various types of action make it possible to simulate the structure and its elements in sufficient detail and to reflect adequately the behavior of this structure. However, detailed simulation with the use of solid finite elements requires a large amount of computing time to perform calculations. This problem can be solved by moving from solid finite elements to bar elements. At the same time, it is necessary to verify the bar calculation models. The article compares the calculation results of a reinforced concrete column simulated in two ways: with the use of solid finite elements based on the actual reinforcement and with the use of bar finite elements. The concrete material for the reference model is specified using a Continuous Surface Cap Model nonlinear model implemented in the LS-DYNA software package. This model reflects the non-linear behavior of concrete and enables to consider the joint behavior of concrete and reinforcing bars. The diagrams of concrete behavior in the bar model are adopted in accordance with SP 63.13330.2012 “Concrete and reinforced concrete structures. Revised edition of SP 52-101-2003”. The study compares the results obtained by the breaking load value and the fracture pattern of the column under consideration.
Static calculations of the pipeline under sanitation by means of “pipe-in-pipe” method
Authors: Primin Oleg , Zotkin Sergey , Gromov Grigory
Published: December 2018

In recent years, methods of trenchless pipe reconstruction have become widely used in Russia. Once the polymer pipe pulled into the existing pipeline, the necessity of filling the intertube space with a mortar is solved. Due to the lack of clear recommendations on the implementation of the filling, builders often perform these works by trial and error. This requires special research. The article deals with an analysis of standards in this area, There is an example of a static strength calculation.
Interaction of a Cylindrical Tank Bottom with an Elastic Foundation
Authors: Leontyev Andrey , Astakhova Avgustina , Maksimov Mikhail
Published: December 2018

The problem of static analysis of a circular cylindrical shell located on the elastic base of the Winkler and reinforced by longitudinal ribs is considered. The stiffeners have a rectangular cross section. The external action is represented by forces evenly distributed along the longitudinal axis, acting on the ribs from the upper structure. It is assumed that at the ends of the shell there are flat vertical walls, which give the contour absolute rigidity in the transverse direction and do not interfere with the longitudinal movement of the shell points. The General moment theory of a circular cylindrical shell is used to solve the problem. A computer program has been developed to implement the proposed algorithm. With the help of the program, a number of examples of calculation are made In the given examples, the influence of such factors as the relative length and thickness, the slope angle of the solution shell, the relative stiffness of the onboard elements on the stress state of the shell is analyzed.
Presence of Basic Oscillatory Properties in the Bagley-Torvik Model
Authors: Aleroev Temirkhan , Kirianova Ludmila
Published: December 2018

The article is devoted to the finding and analysis by numerical methods of eigenvalues and eigenfunctions of the boundary value problem of the differential equation of the second order containing the operator of fractional differentiation in the Riemann – Liouville sense, the so called Bagley – Torvik model. This model is used to analyze damping properties of various viscoelastic materials.
Analysis of the effectiveness of thermal insulation of a multi-layer reinforced concrete slab using layer of concrete with low thermal conductivity under the climatic conditions of Vietnam
Authors: Dinh Tho Vu , Korol Elena , Huy Hoang Nguyen
Published: December 2018

Multi-layer reinforced concrete slabs with thermal insulation materials are widely used in practice all over the world. In Vietnam, in order to apply modern construction of multi-layer structures with an inner layer of low thermal conductivity concrete into practice, it is necessary to conduct numerical researches on the peculiarities of the country climatic conditions country. In this paper, the authors analyze the heat transfer in multilayer reinforced concrete slabs’ roof under the climatic conditions of Hanoi (Vietnam) using finite element method with computer simulation. The object of the study is the insulating capacity of multilayer reinforced concrete roofs under the influence of changes in the temperature of the outer surface of the structure of the buildings’ roof. The research methods are based on the numerical simulation of heat transfer from the outer to the inner surface of the building roof. From the results obtained, compared to the traditional design solution, multilayer reinforced concrete slab appears to have more advantages, and these advantages are available with the use of heat-insulating material made of polystyrene concrete. These scientific researches enable to choose the rational roof design in Vietnam, which satisfies the demand to reduce influence of temperature.
Effective characteristics of a layered tube consisting of elastic-creeping materials
Authors: Bobyleva Tatiana , Shamaev Alexei
Published: December 2018

The article suggests a method for modelling the stress-strain state of layered elastic-creeping tube. This method is based on a combination of the theory of averaging and creep theory. This theory takes into account the previous stress state and its effect on the subsequent deformation period. Creep kernels for the averaged problem are found in the explicit analytical form. These formulas can be used to estimate displacement and stress fields during long-term loading of a composite tube.
Numerical methods for calculation of compound rods
Authors: Kuzhin Bulat
Published: December 2018

Presented calculation of the compound rod for free oscillations and test tasks of calculation of monolithic rods, which in fact began testing the above methods, which the authors considered necessary before using these methods on more complex – composite rods, the results of the applied methods are compared. The purpose of this work - the calculation of the composite rods on the dynamic effects of the method of successive approximations and finite element method, comparing the results; determining the limits of rational use of successive approximations method (SAM). The method of successive approximations (SAM) is used as a resolving method of differential equations. The application of this method to the calculation of structures has a number of advantages: the ability to consider a simplified design scheme of the beam with a distributed load (instead of a system of concentrated forces); the ability to abandon the direct simulation of the design scheme in the design and computer complex (the time of which depends on the number of connections of the composite beam); gives the result of high accuracy at low time costs.
Dispersive waves in functionally graded plates
Authors: Ilyashenko Alla , Kuznetsov Sergey
Published: December 2018

The dispersion waves propagating in anisotropic functionally graded (FG) plates with arbitrary transverse heterogeneity and arbitrary elastic monoclinic anisotropy are analysed within a recently developed six-dimensional formalism. The dispersion relation is obtained for all modes of dispersive harmonic waves propagating in an unbounded plate.
Plastic deformations in the ring spherical shells
Authors: Astakhova Avgustina
Published: December 2018

In the present work the results of the study of plastic deformations distribution in the thickness in ring spherical shells are presented. Resolving differential equations system is based on the Hirchhoff-Lave hypothesis, linear thin shells theory and small elastic-plastic deformations theory. The studying of the development area of plastic deformations in shells thickness are performed with using the results of the elastic solutions method. The basic relations of elastic solutions method that allow to determine the distribution areas of plastic deformations in shells thickness and along the generatrix are presented. The diagram of intense stress dependence from the strain intensity with linear hardening is received. The numerical solution is performed by orthogonal run method. Long and short spherical shells under the operation of three evenly distributed ring loads are observed. The shells have a tough jamming along the contour at the bottom and at the top. Dependency between tension intensity and deformations intensity is accepted for the case of a material linear hardening. Area of plastic deformations in shells thickness for three kinds of ring spherical shells are shown. The results for the loads differed by the value in twice are presented.
Methods for calculating the reinforcement of concrete slabs with carbon composite materials based on the finite element model
Authors: Telichenko Valeriy , Rimshin Vladimir , Kuzina Ekaterina
Published: December 2018

In this article, a method is proposed for calculating the reinforcement of concrete ceiling slabs with carbon composite materials based on the finite element model in the computer program SCAD Office PC. This method allows the most complete and accurate representation to be obtained of the structure stress-strain state before and after reinforcement with composite materials. Therefore, it allows high-quality designing and reduces the cost conducting calculations and tests on a large scale. The design values are taken from the initial data, and include conclusions based on the results of analysis of the technical state of the structures and drawings from the calculation section of the CS (reinforced concrete structures).
Optimisation of the Orchestra Pit Acoustics in Opera Houses by Acoustical Simulations using the Finite Element Method
Authors: Kimmich Jan Michael , Schlesinger Anton , Ochmann Martin , Frank Stefan
Published: December 2018

Musicians in the orchestra pit in opera houses are exposed to relatively high sound pressure levels during the rehearsals and the performance. As a consequence, the communication between the diverse musicians is disturbed and potentially the hearing ability is endangered. In order to improve the situation for the musicians in-situ measurements of the room acoustic properties are performed (e.g. reverberation time T, clarity C80, strength G etc.) in order to provide evaluation data. On the other hand, acoustic simulations of the entire opera house or parts of it are performed by both the Finite Element Method (FEM) for low frequencies and the ray tracing approach for middle and high frequencies. The results are compared to the experimental data. Subsequently, optimization measures, like additional absorbers or diffusers, can be investigated in detail by the simulations. The most promising will eventually be chosen for realization and be measured in-situ.
The main trends of computer-aided design systems development
Authors: Ginzburg Alexander , Shilov Leonid , Shilova Liubov
Published: December 2018

A review of papers in the field of development of automated design systems is presented. For the purpose of evaluation of urgency, importance and prospects of research works in the aforesaid field, the paper also includes the statistics on published works for the last five years. Based on the methods of statistical analysis and comparison, the data from the SCOPUS International Database have been collected. As a result, the main development trend in this direction has been revealed.
Economic efficiency of innovations in construction: the use of the pilotless equipment
Authors: Kristal Maxim , Kisel Tatiana
Published: December 2018

The developments in the field of pilotless transport and equipment act as one of the modern and most perspective directions of the development of modern science and technology. The vehicles, equipped with the system of automatic control, are able to move in the space on the basis of the set algorithm of actions and the instant analysis of the surrounding situation. Thus, they have great prospects of the use in various spheres and will allow to lower the expenses of human labour, accident rate and fuel consumption. The identification of prospects and directions of the use of the pilotless and automated vehicles in construction projects is carried out in this article on the example of road construction. Studying of the existing developments of the pilotless equipment has already allowed to simulate the process of carrying out some earthwork with the use of (Unmanned aerial vehicles) UAVs. As the introduction of the pilotless vehicles and equipment demands some investment expenses, the economic efficiency of the project is calculated. The result of the calculation of the economy, gained with the use of the pilotless equipment has proved the efficiency of such investments.
Assessment of factors affecting the performance of concrete cutting of building structures
Authors: Kossolapov Andrey
Published: December 2018

Analyze of influence factors on performance during concrete sawing and drilling is given on base of more than twenty five years of collecting data on job sites. Those coefficients are showing how productivity of labor declines due to influence of various factors. Numerical coefficients give planners opportunity to make draft time calculation and include concrete drilling and sawing in projects even having no experience in such technology at all.
The role of religious architecture in the sustainable development of contemporary cities: traditions and innovations
Authors: Pryadko Igor’ , Belinskaya Dar’ja
Published: December 2018

The novelty of this paper resides in the fact that its co-authors analyze processes of urban formation and architectural development from the perspective of the city’s performance of social functions. The co-authors study religion as a social institution and the role that it plays in the emergence of medieval cities and in the arrangement of external and internal environments of human beings in present-day cities. Their role is determined as innovative. The performance by the institution of religion of its historic function is studied from the standpoint of the concept of sustainable development. The methodology of this research project is based on the retrospective analysis of historical documents, the comparative analysis of built-up areas, housing planning in traditional and contemporary societies, and the systems concept. As a result of this research, the co-authors have successfully identified several features typical for the operation of the institution of church in a medieval city. The co-authors have analyzed the way the Christian ideology determines the interior and the architectural landscape. The co-authors outline the areas for the application of their research findings. The co-authors believe that these findings must be taken account of in the course of restoration performed in a contemporary megalopolis and in the process of study of the history of urban settlements.
Management of the LCC considering industrial construction life cycle contracts
Authors: Grabovy Peter , Orlov Alexandr
Published: December 2018

Currently the most urgent problem is increasing the efficiency of industrial construction in the green-field and brown-field formats. Introduction of the development method is a typical organizational form of industrial construction management. The method of program management is its variety. The article deals with the analysis of up-to-date strategic aspects of industrial property management. An important task is to create territorial and reproduction systems of industrial property based on life cycle cost (LCC) management. The paper describes the methodical approach to the evaluation of the life cycle cost of industrial property ownership. The evaluation covers the entire life cycle of the property item, from the stage of land development to finished item operation. It is proposed to use life cycle contracts for the development to increase the efficiency of industrial property management. The comparative analysis of life cycle contracts and similar contracts and subcontrator agreements in the area of construction concluded in the territory of Russia showed certain advantages of this approach. The article describes an approach to modeling of an efficient portfolio of industrial development orders. Results of modeling of the structure of the life cycle cost of industrial property ownership as the passive part of fixed funds by functions and stages for the estimated ownership cycle equal to 50 years are presented. Based on the research results the final life cycle cost of ownership for the end user – a resident or owner of the industrial park (IP) industrial property – is determined.
Analysis of risks arising in the implementation of BIM - technologies in construction organizations
Authors: Garyaev Nikolay
Published: December 2018

This paper examines the risks associated with the process of implementing BIM in the organization, as well as the risks associated with the actual use of BIM - technologies. In the first case, risks act as threats, and in the second - in the role of opportunities. Their identification consists in the search for correlation dependence, analysis and use of these studies as a justification for the need to switch to BIM technology. The research methods are based on the analysis of Russian and foreign sources to explain and identify key risks and problems associated with the use of BIM technologies in the construction sector. Based on the conducted studies, a method of risk assessment that can be encountered in the transition to BIM - technologies is proposed.
Analysis of problems and support for solutions related to phases and critical points in the cycle of reproduction of industrial real estate
Authors: Graboviy Petr , Beliakov Sergei
Published: December 2018

The process of industrial production is dynamic. It flows in time, undergoing numerous (deliberate and forced) changes. The current rates of scientific and technological progress methodically increasingly require anticipatory long-term forecasts. By selected critical points can be analyzed the general different processes associated with the risk of building the industrial park facilities, although the cycles of reproduction and its individual phases will at the same time have particular differences in magnitude and interpretation. The scientific and methodological basis for the application of program management as an organizational form of managing the construction phase is the implementation of completed construction queues using the nodal method at critical points in the lifecycle of the multiproject, which makes it possible to identify possible options and methods for shortening construction times that become important reserves for increasing the efficiency of operation and reducing costs construction at the expense of costs in total cost of ownership of the real estate of the industrial park.