bluuebunny/crossref_metadata_2025 huggingface dataset:
Fast deposition of an ultrathin, highly crystalline organic semiconductor film for high-performance transistors
Authors: Zhang Xiali , Deng Wei , Lu Bei , Fang Xiaochen , Zhang Xiujuan , Jie Jiansheng
Published: May 2020

A uniform and smooth Dif-TES-ADT film with thickness of ∼4.62 nm is achieved within 50 s in 2-inch size through the use of a mixed solvent system. The ultrathin Dif-TES-ADT film-based transistors exhibit a maximum mobility up to 5.54 cm2 V−1 s−1.
Photoelectrocatalytic properties and mechanism of rhodamine B degradation using a graphene oxide/Ag3PO4/Ni film electrode
Authors: Zhao Di , Dai Fu-Cai , Li Ai-Chang , Chen Yu , Li Gui-Hua , Wang Qian , Hou Wen-Shuo , Zhou Hong-Zhi
Published: May 2020

GO/Ag3PO4/Ni thin film electrodes prepared by composite electrodeposition show excellent photoelectrocatalytic performance and a photoelectric synergistic effect.
Pyrenoimidazole-fused phenanthridine derivatives with intense red excimer fluorescence in the solid state
Authors: Karthik Shanmugam , Ajantha Joseph , Easwaramoorthi Shanmugam , Gandhi Thirumanavelan
Published: May 2020

A new series of polycyclic aromatic hydrocarbons (PAHs), namely, various pyrene-fused phenanthridines PyFPs having different substituents were developed as fluorescent emitters for optoelectronic applications.
Cd(ii) coordination compounds as heterogeneous catalysts for microwave-assisted peroxidative oxidation of toluene and 1-phenylethanol
Authors: Sutradhar Manas , Roy Barman Tannistha , Alegria Elisabete C. B. A. , Lapa Hugo M. , Guedes da Silva M. Fátima C. , Pombeiro Armando J. L.
Published: May 2020

Cd(ii) compounds as catalysts towards microwave assisted peroxidative oxidation (with tert-butylhydroperoxide, TBHP) of toluene and 1-phenylethanol under heterogeneous conditions are explored.
Interaction of vascular endothelial growth factor and heparin quantified by single molecule force spectroscopy
Authors: Zhang Miaomiao , Liu Ying , Cui Fengchao , Rankl Christian , Qin Juan , Guan Yanxue , Guo Xinyue , Zhang Bailin , Tang Jilin
Published: May 2020

The interaction of VEGF165and heparin was studied quantitatively and visually utilizing single molecule force spectroscopy and molecular dynamics simulation.
Evolution of D6R units in the interzeolite transformation from FAU, MFI or *BEA into AEI: transfer or reassembly?
Authors: Zhang Juan , Chu Yueying , Deng Feng , Feng Zhaochi , Meng Xiangju , Xiao Feng-Shou
Published: May 2020

The formation and evolution of building units for zeolites play an important role during crystallization.
Hydrogen bonding sewing interface
Authors: Cao Zhenxing , Song Zhigong , Liang Fengzhi , An Xiaoguang , Al-Quraishi Karrar K. , Wang Min , Chen Jianchao , Ding Dong , Yang Yingchao
Published: May 2020

Hydrogen bonding and van der Waals (vdW) forces have been precisely measured and distinguished by an in-house nanomechanical testing system.
Development of novel N-(6-methanesulfonyl-benzothiazol-2-yl)-3-(4-substituted-piperazin-1-yl)-propionamides with cholinesterase inhibition, anti-β-amyloid aggregation, neuroprotection and cognition enhancing properties for the therapy of Alzheimer's disease
Authors: Mishra Chandra Bhushan , Shalini Shruti , Gusain Siddharth , Prakash Amresh , Kumari Jyoti , Kumari Shikha , Yadav Anita Kumari , Lynn Andrew M. , Tiwari Manisha
Published: May 2020

A novel series of benzothiazole–piperazine hybrids were rationally designed, synthesized, and evaluated as multifunctional ligands against Alzheimer's disease (AD).
Ferroelectric P(VDF-TrFE)/POSS nanocomposite films: compatibility, piezoelectricity, energy harvesting performance, and mechanical and atomic oxygen erosion
Authors: Liu Y. Z. , Zhang H. , Yu J. X. , Huang Z. Y. , Wang C. , Sun Y.
Published: May 2020

Poly(vinylidene difluoride) (PVDF) and its copolymers as the polymers with the highest piezoelectric coefficient have been widely used as sensors and generators.
Alkaline water-splitting reactions over Pd/Co-MOF-derived carbon obtained via microwave-assisted synthesis
Authors: Ipadeola Adewale K. , Ozoemena Kenneth I.
Published: May 2020

Palladium nanoparticles supported on MOF-derived carbon serve as an efficient bifunctional electrocatalyst for alkaline water-splitting reactions.
Copper–tripeptides (cuzymes) with peroxidase-mimetic activity
Authors: Nguyen Le Truc , Ho Wing Fat , Yang Kun-Lin
Published: May 2020

Copper–tripeptide complexs (cuzyme) exhibited peroxidase-like activities that use hydrogen peroxide to oxidize substrates such as 2,2-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ATBS) and trypan blue dye.
Biofunctional Janus particles promote phagocytosis of tumor cells by macrophages
Authors: Zhang Ya-Ru , Luo Jia-Qi , Li Jia-Xian , Huang Qiu-Yue , Shi Xiao-Xiao , Huang Yong-Cong , Leong Kam W. , He Wei-ling , Du Jin-Zhi
Published: May 2020

A versatile Janus particle platform modified with biological ligands can facilitate tumor cell phagocytosis by macrophages for promising cancer immunotherapy.
Effects of eigen and actual frequencies of soft elastic surfaces on droplet rebound from stationary flexible feather vanes
Authors: Zhang Chengchun , Wu Zhengyang , Shen Chun , Zheng Yihua , Yang Liang , Liu Yan , Ren Luquan
Published: May 2020

The aim of this paper is to investigate the effect of eigenfrequency and the actual frequency of the elastic surface for droplet rebound.
Layering of bidisperse charged nanoparticles in sedimentation
Authors: Xu Xufeng , Biesheuvel P. M. , Cölfen Helmut , Spruijt Evan
Published: May 2020

The layering of nanoparticles can be quantitatively in situ measured and tuned, which agrees very well with the theoretical calculations.
Opticalin situmonitoring during the synthesis of halide perovskite solar cells reveals formation kinetics and evolution of optoelectronic properties
Authors: Suchan Klara , Just Justus , Becker Pascal , Unger Eva L. , Unold Thomas
Published: May 2020

Opticalin situmonitoring tracks crystallization and optoelectronic properties of halide perovskites during growth in a glovebox environment.
Identification of crucial aberrantly methylated and differentially expressed genes related to cervical cancer using an integrated bioinformatics analysis
Authors: Ma Xiaoling , Liu Jinhui , Wang Hui , Jiang Yi , Wan Yicong , Xia Yankai , Cheng Wenjun
Published: May 2020

Methylation functions in the pathogenesis of cervical cancer. In the present study, we applied an integrated bioinformatics analysis to identify the aberrantly methylated and differentially expressed genes (DEGS), and their related pathways in cervical cancer. Data of gene expression microarrays (GSE9750) and gene methylation microarrays (GSE46306) were gained from Gene Expression Omnibus (GEO) databases. Hub genes were identified by ‘limma’ packages and Venn diagram tool. Functional analysis was conducted by FunRich. Search Tool for the Retrieval of Interacting Genes Database (STRING) was used to analyze protein–protein interaction (PPI) information. Gene Expression Profiling Interactive Analysis (GEPIA), immunohistochemistry staining, and ROC curve analysis were conducted for validation. Gene Set Enrichment Analysis (GSEA) was also performed to identify potential functions.We retrieved two upregulated-hypomethylated oncogenes and eight downregulated-hypermethylated tumor suppressor genes (TSGs) for functional analysis. Hypomethylated and highly expressed genes (Hypo-HGs) were significantly enriched in cell cycle and autophagy, and hypermethylated and lowly expressed genes (Hyper-LGs) in estrogen receptor pathway and Wnt/β-catenin signaling pathway. Estrogen receptor 1 (ESR1), Erythrocyte membrane protein band 4.1 like 3 (EPB41L3), Endothelin receptor B (EDNRB), Inhibitor of DNA binding 4 (ID4) and placenta-specific 8 (PLAC8) were hub genes. Kaplan–Meier method was used to evaluate survival data of each identified gene. Lower expression levels of ESR1 and EPB41L3 were correlated with a shorter survival time. GSEA results showed that ‘cell adhesion molecules’ was the most enriched item. This research inferred the candidate genes and pathways that might be used in the diagnosis, treatment, and prognosis of cervical cancer.
Decellularized bone extracellular matrix in skeletal tissue engineering
Authors: Rothrauff Benjamin B. , Tuan Rocky S.
Published: May 2020

Bone possesses an intrinsic regenerative capacity, which can be compromised by aging, disease, trauma, and iatrogenesis (e.g. tumor resection, pharmacological). At present, autografts and allografts are the principal biological treatments available to replace large bone segments, but both entail several limitations that reduce wider use and consistent success. The use of decellularized extracellular matrices (ECM), often derived from xenogeneic sources, has been shown to favorably influence the immune response to injury and promote site-appropriate tissue regeneration. Decellularized bone ECM (dbECM), utilized in several forms — whole organ, particles, hydrogels — has shown promise in both in vitro and in vivo animal studies to promote osteogenic differentiation of stem/progenitor cells and enhance bone regeneration. However, dbECM has yet to be investigated in clinical studies, which are needed to determine the relative efficacy of this emerging biomaterial as compared with established treatments. This mini-review highlights the recent exploration of dbECM as a biomaterial for skeletal tissue engineering and considers modifications on its future use to more consistently promote bone regeneration.
The emerging complexity of PDGFRs: activation, internalization and signal attenuation
Authors: Rogers Madison A. , Fantauzzo Katherine A.
Published: May 2020

The platelet-derived growth factor receptor (PDGFR) family of receptor tyrosine kinases allows cells to communicate with the environment to regulate diverse cellular activities. Here, we highlight recent data investigating the structural makeup of individual PDGFRs upon activation, revealing the importance of the whole receptor in the propagation of extracellular ligand binding and dimerization. Furthermore, we review ongoing research demonstrating the significance of receptor internalization and signal attenuation in the regulation of PDGFR activity. Interactions with internalization machinery, signaling from endosomes, receptor degradation and receptor recycling are physiological means by which cells fine-tune PDGFR responses to growth factor stimulation. In this review, we discuss the biophysical, structural, in silico and biochemical data that have provided evidence for these mechanisms. We further highlight the commonalities and differences between PDGFRα and PDGFRβ signaling, revealing critical gaps in knowledge. In total, this review provides a conclusive summary on the state of the PDGFR field and underscores the need for novel techniques to fully elucidate the mechanisms of PDGFR activation, internalization and signal attenuation.
Elevator-type mechanisms of membrane transport
Authors: Garaeva Alisa A. , Slotboom Dirk J.
Published: May 2020

Membrane transporters are integral membrane proteins that mediate the passage of solutes across lipid bilayers. These proteins undergo conformational transitions between outward- and inward-facing states, which lead to alternating access of the substrate-binding site to the aqueous environment on either side of the membrane. Dozens of different transporter families have evolved, providing a wide variety of structural solutions to achieve alternating access. A sub-set of structurally diverse transporters operate by mechanisms that are collectively named ‘elevator-type’. These transporters have one common characteristic: they contain a distinct protein domain that slides across the membrane as a rigid body, and in doing so it ‘drags” the transported substrate along. Analysis of the global conformational changes that take place in membrane transporters using elevator-type mechanisms reveals that elevator-type movements can be achieved in more than one way. Molecular dynamics simulations and experimental data help to understand how lipid bilayer properties may affect elevator movements and vice versa.
Novel residual pollution layer model related to the arc propagation along the surface based on discretisation
Authors: Li Jian , Zhou Jun , Guan Zhicheng , Wang Liming
Published: May 2020

A concentrated treatment used on the residual pollution layer in the Obennaus and its improved models is inappropriate for establishing the propagation model of an arc along the pollution layer surface. Therefore, discretising the residual pollution layer is innovatively proposed. The residual pollution layer is discretised into several infinitesimal pollution layer elements with various characteristics along the vertical direction from the arc root to the ground electrode. Quantitative relationships between the surface conductivity of a pollution layer element and several variables, including salt deposit density, water film thickness, temperature, and time, are concluded based on experimental data and relevant theories. A distribution factor that determines leakage current densities in a pollution layer is defined. A residual pollution layer surface resistance model based on the discretisation, relational expressions, and distribution factor is established. A comparison of the proposed model with the results observed in the experiments with and without a partial arc shows that the proposed model is reasonable.
Power‐current coordinated control without sequence extraction under unbalanced voltage conditions
Authors: Wang Yichao , Li Xiangqi , Li Yan
Published: May 2020

The increasing penetration of renewable power sources into power system is calling for an evolution of grid interconnection control strategy. In particular, during asymmetrical grid faults, power turbulence and current distortion of three‐phase inverter cannot be balanced unless coordinated control is adopted. Several coordinated control strategies are usable for operating under unbalanced grid voltage nowadays. These control strategies usually require a real‐time sequence detection block for reference generation. This study explores a coordinated control strategy without real‐time sequence detection. It has three theoretical innovations: (i) the internal mathematical connection between power fluctuation and current quality is derived; (ii) a control strategy with a continuous adjustable factor is proposed. The power oscillations and the current quality can be controlled flexibly by adjustment factor without using the filter and sequence extraction calculation; (iii) the method for selecting the continuous adjustable factor is also presented. The experiment and simulation results prove that these innovations facilitate power‐current coordinated control with simple reference selection criteria and excellent performance.
Graphene rotational switch through vacancy defect and nitrogen doping
Authors: Poliki Mohammad , Golzani Mozhgan , Haji‐Nasiri Saeed
Published: May 2020

A graphene rotational switch (GRS) is presented utilising vacancy defect and nitrogen (N) doping in armchair graphene nanoribbon (AGNR). By twisting AGNR at different angles in the suggested device, its conductivity can be controlled. Based on the simulation results it is indicated that the electronic parameters such as current, transmission, local density of state, and conductance of the suggested GRS are also associated with the width of AGNR, selection of defect or doping and its location in the AGNR. Furthermore, the results show the dependency of the proposed GRS to the voltage. In this Letter, a monotonic increase or decrease in the current between the minimum and maximum angles in the corresponding bias voltage is defined as the proper switching behaviour. The assumed defect or doping is replaced by three locations with three various widths and five different twist angles of AGNR, in different analysed modes. Devices have better switching behaviour so the range of Imax/Imin is within 37–1076 among all the modes. The best three modes are the perfects, N doping near the AGNR edge and the vacancy defect in the centre of the deformation region of AGNR in the width of 9, 10 and 11w, respectively.
Information technologies implementation for reducing water losses in water supply systems
Authors: Serov Dmitry
Published: May 2020

The article discusses the elements of an automated system for collecting, storing and transmitting data on water consumption, modern metering devices, data collection and transmission devices. The author analyzes the shortcomings of existing accounting and analysis automation systems at Russian water utilities. A comprehensive approach to automated systems in the field of water consumption accounting is proposed. The article considers the experience of the State unitary enterprise “Vodokanal of Saint Petersburg” in the sphere development and application of a single automated complex for diagnostics, monitoring and management of the water supply network. The goals and main functions of the complex are revealed, the main stages and results of its implementation are presented.
Means and methods of noise protection to reduce the risk of cardiovascular disease in workers
Authors: Stuzhenko Natalya , Molev Mikhail , Zanina Irina , Kobzeva Nataliya
Published: May 2020

Some manufacturing processes are accompanied by significant noise and vibration. Sources of intense noise and vibration are machines and mechanisms with unbalanced rotating masses, as well as technological installations and apparatuses in which the movement of gases and liquids occurs at high speeds and has a pulsating character. The modern development of technology, equipping enterprises with powerful and fast-moving machines and mechanisms leads to the fact that people are constantly exposed to noise of increasing intensity. Increasing noise and vibration in the workplace has a harmful effect on the human body. As a result of prolonged exposure to noise, the normal activity of the cardiovascular and nervous systems, digestive and hematopoietic organs is disturbed, and professional hearing loss develops, the progression of which can lead to complete hearing loss.Among industrial hazards, noise and vibration occupy one of the leading places among production hazards. The harmful effects of increased noise levels on the human body are well khown, therefore, the relevance of this problem is obvious.
Theoretical studies on the calculation of the noise of impact equipment in blacksmith shops
Authors: Staseva Elena , Larin Dmitry , Demchenko Sergei , Kobzev Kirill
Published: May 2020

Most types of forging equipment relate to impact machines, during the operation of which impulse noise occurs, the levels of which at workplaces, in most cases, exceed the maximum permissible values and relate to those factors, the significance of which in some cases is greater than dustiness, high temperature, manipulation of heated workpieces. Therefore, the problem of reducing vibration and noise in the forge shops is extremely relevant and has great scientific and socio-economic significance. To solve the problem of noise reduction in forge shops, various options for reducing the noise activity of equipment have been developed/ It is possible to most effectively reduce noise by changing the material and shapes of the beds, noise-attenuating casings, oil baths for gears.
Formation of the infrastructure of the waste processing cluster
Authors: Serebryakova Elena , Smorodina Elena , Belyantseva Oksana , Kryuchkova Irina
Published: May 2020

In the Strategy for socio-economic development of the Voronezh region for the period until 2035, one of the main problems in the field of waste management is the rather low level of waste involvement in economic turnover. Improving of the current situation is expected by introducing resource-saving and low-waste technologies; implementation of a territorial and regional waste management program, as well as through the creation of an environmentally friendly waste management infrastructure. The implementation of these measures is expected within the framework of the state program "Protection of the Environment and Natural Resources" in order to increase the level of development of human capital and the quality of life of the population of the Voronezh region. In a scientific study a comparative analysis method was used. This article discusses the essence of the concept of the infrastructure of a waste processing cluster, infrastructure facilities are classified. The urgency of creating and the need to develop the infrastructure of a waste processing cluster on the territory of the Voronezh region is formulated. The main problems of the transition to a new waste management system are identified.
Calculating the load on the room cooling ceiling panel at convective heat gains
Authors: Malyavina Elena , Lomakin Alexander
Published: May 2020

A well-known statement of the theory of thermal stability asserts that when a harmonically time-changing convective heat flux enters a room, it can only be assimilated by a radiant cooling system if the assimilating flow exceeds the perturbing convective flow in magnitude. However, in engineering practice, there are no purely radiant systems. Therefore, the article has considered a ceiling cooling panel as a room cooling system, the heat flow from which is of a radiant-convective nature. The convective heat access to the room is constant during the working hours from 9 a.m. to 6 p.m. The task of determining the load on the cooling system has been performed by calculations.. Herewith, the rooms of different internal thermal stability have been considered. According to the calculation results, it has been found that, since the amount of the heat gains remains constant for a long period of time, the process of the room cooling comes almost to a stationary state and does not depend on the room thermal stability with assimilated heat gains, the value of which in different options varied from 100 W to 1000 W. It has been found, that when the temperature difference between the panel surface and the surrounding surfaces increases, the proportion of the convective assimilating flow becomes bigger.
Stress-strain connection analysis of bolted joints for thin-walled steel profiles working in tension and compression
Authors: Ustimenko Evgeniy , Skachkov Sergey , Vinogradova Elena , Muro Genrikh
Published: May 2020

The issues of designing structures from thin-walled profiles with nodal joints on bolts are considered, a method of strength calculation is developed. The calculation takes into account two variants of bolted joints on high-strength bolts and unregulated tightening connections, two variants of the operation of a shear-resistant connection with a “breakdown” when overcoming the force over the friction force of the contact surfaces and without a “breakdown”. The methodology includes the bolted connection splitting for the elements working in tension and compression.
Influence of detailing the climate model on the calculation of energy consumption
Authors: Malyavina Elena , Malikova Olga , Van Pham Luong
Published: May 2020

The repeatability of outdoor air temperature and enthalpy combinations in a construction area is a necessary initial information for calculating the energy consumption of air conditioning systems. The most convenient form of presenting climatic data in such calculations is the probabilistic-statistical model, which constitutes a Table, the cells of which show the probabilistic repeatability of the outdoor air temperature and relative humidity. The parameter values given on the vertical and horizontal scales, that form the cell boundaries, can be taken with larger or smaller increments. The paper that served as the basis for this article, provides verification of the initial climatic model detailing experimentally under full-scale conditions in the city of Hanoi (Vietnam). The criterion for the appropriate model detailing was the deviation of the energy consumption estimates of the room cooling system, got experimentally and by calculation. Moreover, the calculations were performed not only on two climate probabilistic and statistical models, but also on the data of direct measurements of the outdoor air temperature and relative humidity with an accuracy of 0.1 for temperature and up to 2 % for relative humidity.
Construction reorganization as a type of high-rise construction and environmental protection
Authors: Avetisyan Robert , Khalil Muhammad , Galaeva Natalya , Kazaryan Ruben
Published: May 2020

Construction reorganization, as a type of high-rise construction is part of a basic reorganization cycle in which four phases (phases, states, technological redistribution) are consistently implemented: device, disorganization, reorganization and co-organization. Loft style methodology: the integrated performance indicator organizational and technological operational reliability (OTOR) of the Loft room, which is determined with the help of stellar infographic models, makes it possible to prove arguably the necessity or absence of the need to reorganize the former industrial building. The assessment of the functional zone of the level of the OTOR indicators in the system of the infographic model, in which the number of axes emanating from the point “zero”, corresponds to the number of parameters characterizing a specific functional zone. Valuation parameters are ranked in accordance with their tendency towards centripetal and centrifugal. The field of our research lies in the phase of reconstruction. The determination of the level of OTOR of one functional zone is formed by the construction of two infographic star-shaped models, one of which is constructed by centripetal indicators, and the other by centrifugal indicators.
Solving regularized equations in the form of polynomials
Authors: Petelina Vera
Published: May 2020

The article is devoted to the determination of second-order perturbations in rectangular coordinates and components of the body motion to be under study. The main difficulty in solving this problem was the choice of a system of differential equations of perturbed motion, the coefficients of the projections of the perturbing acceleration are entire functions with respect to the independent regularizing variable. This circumstance allows constructing a unified algorithm for determining perturbations of the second and higher order in the form of finite polynomials with respect to some regularizing variables that are selected at each stage of approximation. The number of approximations is determined by the given accuracy. It is rigorously proven that the introduction of a new regularizing variable provides a representation of the right-hand sides of the system of differential equations of perturbed motion by finite polynomials. Special points are used to reduce the degree of approximating polynomials, as well as to choose regularizing variables.
Numerical modeling of air treatment processes in contact apparatuses
Authors: Ulyasheva Vera , Kryshkin Nikita
Published: May 2020

Formation of standardized parameters of air in rooms largely depends on climatic features of the area. It is known that at low ambient temperatures (below -15°C) and with standard heating and ventilation systems in rooms, relative air humidity in rooms is about 5% with the minimum of 15%. There is an issue related to determination of the efficiency of heat-and-moisture treatment of air in chambers with irrigated porous packing, which depends on such factors as the geometric shape of channels, hydrodynamic conditions for interaction of the wetted surface of the packing, water film flowing down the surface of the irrigated packing, and air flow moving towards the water film. The present paper presents results of numerical modeling for heat and mass transfer processes using the STAR-CCM+ software package. The k-ε model was used as the turbulence model. Research data can be used to assess quantitative characteristics in contact apparatuses of various configurations.
Construction of geodesic domes made of wood and composite materials during restoration and conservation of cultural heritage objects
Authors: Zhivotov Dmitry , Pastukh Olga
Published: May 2020

The paper provides an overview of the existing structural and technological solutions for the construction of outdoor shelters over cultural heritage objects during restoration works in order to preserve from environmental influences and prevent external precipitation from entering buildings and structures. For these purposes, it is proposed to use standard solutions for various spans in the form of geodetic dome structures to protect buildings and structures from external precipitation and other atmospheric phenomena. The paper highlights the authors' work on the creation of new technical solutions for geodesic domes made of wood and high-strength polymers, which will significantly facilitate load-bearing structures, compared to metal and reinforced concrete. Also, the use of modern materials and technologies for the construction of protective structures will allow taking care of the environment, taking into account GREEN and ZOOM standards.
Monitoring of the framings stress-strain with strain gauges
Authors: Yurgaytis Alexey , Topchiy Dmitry , Shinkarenko Andrey , Saidova Julia
Published: May 2020

The article describes the research methods of the stress-strain of reinforced concrete framings (piles and pylons) using embedded strain gauges. The relations of load to indirect reactive characteristics displayed by the weighing device which were obtained through laboratory tests of framings reference specimens are given. Summary tables of framings stress-strain monitoring results gained during the II Phase of construction project (after base plate concreting for piles and floor slab concreting for pylons) are included. The study of obtained results of actual framings stress will allow reducing construction material consumption through the reduction of the safety factors on reliability.
Sagging-collapse sinkholes: simulation modelling
Authors: Khomenko Victor
Published: May 2020

In the paper a kind of sinkholes is considered, which is typical for areas where soluble rocks are covered by clay’s layer overlapped by saturated sands. The presence in soluble rocks of non-filled cavity contacting with covering clays is necessary to the sinkhole formation, however it can be provoked not only by cavity’s enlarging but else by changes of groundwater levels. The mechanism of this complex process has been researched by its in-laboratory simulation modelling, and its results can possibility to the author to name this phenomenon as “sagging-collapse sinkholes”, because it includes sagging and collapse of clays accompanied by downward moving of sands and sometimes by their liquefaction. Modelling technology is given in the paper in detail and the conception of investigated process is offered. Except experimental study of sagging-sinkhole formation the purposes of the work was quantitative forecasting of this geological phenomenon. Forecasts have been developed that allow calculating the diameter of the expected sinkhole, particularly. An assessment of their reliability is given.
Construction and insulation of agricultural buildings and structures
Authors: Efimov Boris , Rubtsov Oleg , Bessonov Igor , Medvedev Andrey
Published: May 2020

The article covers different application aspects of the products made of polyethylene foam within the scope of insulation systems of framed and frameless constructions used in the quality of storage premises, logistic objects, agricultural storage facilities and livestock facilities as well as framed residential buildings. Agricultural storage facilities, livestock facilities, covered parking areas for agricultural machinery and some types of storage premises represent the agricultural construction facilities which require the established protection systems against excessive heat losses as well as monitoring of the state of the internal environment - its temperature and humidity. These structures are built based on one of three schemes: frameless type, framed type with a rigid coating and framed type with a tent coating. The insulation of buildings constructed before 2010 is predominantly characterized by usage of mineral wool plates (with a protective facade covering) or sandwich panels. The main problem of suchlike coverings is the impossibility of creating an insulating coating without joints, seams or gapless junctions to the base. Mineral wool plates, in case of destruction of the waterproof coating, contact with water and firstly lose their thermal and physical properties, and then – come to the destruction themselves. Sandwich panels are more resistant to weather impacts, but create a coating with huge quantity of cold bridges and paths of convective air transfer through gaps or openings.
Stress-strain state of the "combined tower-reinforced concrete foundation-foundation soil" system for high-rise structures
Authors: Mailyan Levon , Yaziev Serdar , Sabitov Linar , Konoplev Yuriy , Radaykin Oleg
Published: May 2020

The aim of the work was to evaluate the effectiveness of the "combined tower-reinforced concrete foundation-foundation soil" system for high-rise structures on the example of a wind power plant (wind turbine) with a capacity of 1.5-2.0 MW using computer modeling in the PC "Ansys". Thus, under the combined tower the article refers to a high-rise building, consisting of two parts: the lower composite, the upper – in the form of a thin-walled core-shell closed profile. In both cases, the shell is a pipe with a weak taper. As an analogue, the VEU considered in foreign literature is adopted: the radius of the rotor is R=41 m, the height to the axis of the wind wheel is zhub =80 m, the shell is made of high-strength C355 steel and unlike the analog in this work the cavity of the tower lower part to a height of 20 m was filled with B60 class concrete. The modeling took into account the spatial work of the elements of the structural system and the physical nonlinearity of the materials from which they are made. At the same time, the Mises strength theory was used for steel, the Williams – Varnake theory - for concrete, and the Drukker – Prager theory - for the foundation soil. Comparison of the calculation results with the analogue showed that the destructive load of the tower increased by 37% due to filling the lower part of it with concrete, which indicates the effectiveness of the proposed solution. In this case, the destruction of the tower with a concrete core and without it occurred from the loss of steel shell local stability at the level of the tower junction with the foundation (with a compressed zone).
Optimization of production and transport infrastructure based on cluster analysis methods
Authors: Moskvichev Oleg , Nikishchenkov Sergei , Moskvicheva Elena
Published: May 2020

In order to solve the problems of optimizing production and transportation systems, a clustering procedure for objects is suggested. The procedure is a universal methodology for dividing a set of objects into subsets with their centers possessing optimal properties. At the same time, the use of point proximity metrics used in cluster analysis models the minimization of distances during transportation. If the volume of produced/extracted containerisable products of a production point is considered as the “weight” of each point, than the problem of minimizing transportation costs can be solved as a problem of optimizing clusters and their centers. A set of analytical models has been developed to describe and optimize the choice of location and number of container terminals (CT) at the first level and container storage and distribution centers (СSDC) at the second level of a two-level terminal model and logistics infrastructure of the container transport system (CTS). New clustering algorithms are suggested to determine the locations of CT and СSDC based on the condition of minimizing transportation costs and creating a terminal and logistics infrastructure, taking into account given or random number of clusters.
Problem of the degradation criteria for transportation construction elements
Authors: Lantukh-Lyashchenko Albert , Onishchenko Artur , Davydenko Oleksandr
Published: May 2020

The article is devoted to the pressing problem of managing the reliability and durability of transport constructions. Modern scientific approaches to assessing the technical condition of transport facilities based on an analysis of element degradation during the life cycle of operation considered. The article presents the advantages and disadvantages of the most common prediction models of the technical condition of building structures. Each model uses a characteristic criterion for degradation of building structures: load and unload cycles, rejection number of chlorides, intensity coefficient, a geometric parameter (parameters) of the crack in the material, reliability, etc. The problem of choosing the control parameter of the lifecycle model of the bridge elements is analyzed. The theoretical basis for the Markov phenomenological model of damage accumulation and the model of degradation based on the physical and mechanical characteristics of the material formulated. Depending on the stage of the life cycle, it is proposed to select the type of prediction model.
The process of increasing the stable operation of the working body in crank presses
Authors: Kobzev Kirill , Goncharova Yuliya , Kobzeva Nataliya
Published: May 2020

The article considers the study of the synthesized concept of frictional contact of solids in crank presses. As a result of the analysis the possibility of obtaining the maximum load characteristic of the friction contact within the interval of variation of the friction coefficient has been established. The possibility of equality of the values of the friction force of the friction contact at the boundaries of the indicated interval in the presence of a maximum and the achievement of their greatest stability under these conditions is also revealed. As result the upgraded concept of frictional contact allows theoretically to obtain a very high stability of the friction force, however, due to the relatively large value of the angle and force parameter, it is used inefficiently. A necessary condition for the absence of zero reversal of the output parameter of the main friction group of the friction contact in the interval of variation of the friction coefficient and the presence of the maximum function of the load capacity of the friction contact is the transfer of its full load by the sensitive elements of the additional friction group. An additional condition for the existence of a maximum is the need for the sensitive elements of the main friction group to transfer part of its full load at an equal number of friction pairs of both friction groups, and for the sensitive elements to transfer the full load of the main friction group at a lower number of friction pairs than in the additional friction group.
SPD in illumination system of HV air insulated substation
Authors: Kosorukov Anton , Karpov Pavel , Kutuzova Nataliya , Pashicheva Svetlana , Titkov Vasiliy
Published: May 2020

The article discusses the distribution of the lightning current between communications of the object as the main aspect determining surge protective devices (SPDs) parameters for applying in substation’s low voltage networks. Wireframe model was designed to compute field-circuit model of earthing device (ED) and define the element potentials and currents using circuit analysis methods. Transients were calculated using operator method. Results of calculation and measurements of the lightning current’s distribution in ED and cables in illumination network of air insulated substation presented. Experimental study results obtained in training ground PJSC «Lenenergo», one of the largest electric power distribution company in Russia. Case of lightning strike in the floodlight mast combined с with lightning rod in 110 kV air insulated substation was studied. Requirements for the parameter "impulse discharge current amplitude" SPD defined. Described general approaches to the illumination network’s lightning surge protection on air insulated substation.
Influence of the length parameter of an underground oil pipeline on the frequency of free oscillation
Authors: Vladimir Sokolov , Razov Igor` , Dmitriev Andrey
Published: May 2020

The problem of finding the natural frequencies of thin-walled underground oil pipelines is solved, based on the application of a semi-momentless theory of cylindrical shells of medium bending, in which bending moments in the longitudinal direction are not taken into account in view of their smallness compared with moments acting in the transverse direction. The solution to this approach is a fourth-order homogeneous differential equation satisfying the boundary conditions of articulation at each end. This equation includes the parameters of the length, internal pressure, thinness of the pipeline, as well as the values of the coefficient of elastic resistance of the soil, the attached mass of the soil and the attached mass of the flowing oil. Based on the data obtained by the derived formulas, the frequency characteristics of large-diameter thin-walled underground oil pipelines are determined depending on the length of the element, as well as on the soil conditions. It has been established that the minimum frequencies are realized for shell modes of vibration with a length parameter of the pipeline section (the ratio of the length of the section to the radius) not exceeding 13. A formula is derived that allows one to determine the boundary between the use of the rod and shell theory for calculating pipelines for dynamic effects. Using the dynamic stability criterion, in which the frequency of natural oscillations vanishes, expressions are derived that allow one to determine the external critical pressure on the wall of the pipeline, which takes into account the length of the pipeline, as well as the number of half waves in the transverse and longitudinal directions, in which the pipeline goes into emergency condition.
Development of an interaction model of sea and land transport in the transportation of perishable goods
Authors: Baginova Vera , Ushakov Dmitry , Zenkin Andrey
Published: May 2020

The issues of the interaction of sea and land transport during the transportation of perishable goods are especially in demand at present in connection with the active development of intermodal transport. In addition, due to the rapidly changing specifics of the transport and logistics infrastructure in ports and terminals, the organization of transportation of perishable goods, which are especially vulnerable in terms of quality, requires new approaches and methods. The paper notes the high importance of preliminary preparation for the process of interaction between marine and land transport by operators of marine and land transport. On the part of the marine transport operator, it is advisable to focus on the pre-contractual work and clarification of the conditions for the formation of the freight rate; on the part of the land transportation operator, in the process of preliminary preparation, the state of the transport network for transporting refrigerated cargo near the port is of great importance. The paper proposes two new indicators for assessing the state of the transport network for the transportation of refrigerated goods. At the end of the paper, a model of the interaction of sea and land transport during the transportation of perishable goods with the expression of the multitude of cargo flows of perishable goods in the port through the matrix form is presented.
Developing the surface layer parameters of road-building and mining machines
Authors: Gorshkov V. , Maksimov S. , Pushkaryov Aleksandr
Published: May 2020

The article is intended for specialists in the field of restoring the parts of road-building and mining equipment. Information is given on the use of shot blasting to form a high-quality surface for parts of road-building and mining equipment. The selection of shot blasting regimes for increasing the durability, reliability and safety of parts is justified. The given information allows expanding the possibilities of using shot blasting for road construction and mining equipment.
Development of strategy for ensuring operability of transport and technological machines
Authors: Repin Sergey , Maximov Sergey , Zazykin Andrei , Voropaev Nikolay
Published: May 2020

The article presents the results of research in the field of ensuring the performance of complex technical objects on the example of transport and technological machines (TTM), which include transport equipment, as well as technological machines (excavators, loaders and other equipment that performs a technological process). The strategy of forming a system of maintenance and repairs taking into account the technical condition of TTM elements is described. The strategy provides for the division of structural elements of machines into four groups, depending on the principle approach to calculating the frequency of their repair. The criterion for determining the frequency of repairs is the probability of reaching the maximum values of characteristics during the inter-repair period, as well as the degree of criticality of the consequences of possible failure of the element.
Assessment of the impact of railway traffic on the state of plant communities
Authors: Popova Elena
Published: May 2020

The article reflects the results of studies on the impact of railway traffic on plant communities. The anthropogenic impact on the environment is complex. Many factors affect the species diversity of the flora near railways in different ways. The accumulation of Cd, Zn, Pb, Cr in plants ofPimpinella saxifragaL.,Hypericum perforatumL.,Trifolium mediumL was revealed. The anthropogenic stress leads to disruption of naturally formed ecosystems, which manifests in a decrease in species diversity, density and biological productivity. As a result of the anthropogenic impact adventitious plants appear, the share of which is 11% of the flora. Research in this area contributes to a deeper understanding of the processes of anthropogenic transformation of floristic complexes and should become the basis for environmental monitoring of disturbed habitats.
The “smart city” concept as a strategy for managing the infrastructure of a single-industry town
Authors: Kunanbaeva Kymbat , Rahimova Saule , Titkov Aleksey , Goncharenko Lyudmila
Published: May 2020

The paper is devoted to topical issues of the formation and development of an effective economic policy for managing the infrastructure of a single-industry town with the priorities of using the “smart city” concept. The purpose of the paper is to form a system of integrated management tools for the strategic development of a single-industry town, taking into account modern digitalization mechanisms of socio-economic systems. Particular attention is paid to the diversification of the development of single-industry towns, from revising the emphasis of the economic role from city-forming enterprises to small and medium-sized businesses, social sphere of single-industry towns, sectors of the economy focused on human resources and human capital. The main research methods were comparison, analogy, analysis and synthesis, systematic approach, forecasting method, induction and deduction methods, statistical method, hypothesis design method. The results of scientific research can find practical application at regional levels in the development of strategic programs for the development of single-industry towns, which are focused on the application of innovations and new technologies.