bluuebunny/crossref_metadata_2025_split huggingface dataset:
Molecular Dynamics Simulation of Rarefaction Effect on Shear-driven Gas Flow in Nanochannels
Authors: Zhang Ye , Zhang Ran , Xie Wenjia , Li Hua 
Published: February 2020

AbstractThe nanoscale gas flow at normal temperature and pressure varies from the slip flow regime to the transition regime, of which the character length changes across several nanometers to several thousand nanometers. The difference in the degree of rarefaction leads to different rules of the flow in nanochannels. In order to study the influence of rare gas effect on the nanoscale gas flow, we use three-dimensional molecular dynamics method to simulate the shear flow confined by two parallel plate under different Knudsen numbers, and then obtain the distribution of flow velocity, density, normal stress and shear stress, thus calculating and analyzing the variation of the tangential momentum accommodation coefficient. Counting the gas molecules according to the velocity with positive and negative values respectively, we find that the gas flow is decomposed into two independent shear flows, which indicates strong non-equilibrium characteristics in the nanochannel.
Research on Construction Method, Risk Identification and Evaluation Technology of UHV AC Composite Cross Arm Pole and Tower
Authors: Hu Chunhua , Wan Jiancheng , Jiang Ming , Hao Yujing 
Published: February 2020

Abstract
The research on construction method of UHV AC composite cross arm pole and tower mainly combines the material and structural characteristics of composite cross arm insulator, analyzes the danger sources which may cause damage to construction links such as packaging, transportation, storage, construction hauling, lifting and installation, and then this paper conducts evaluation, and proposes corresponding construction measures, thus forming the construction technical scheme of UHV AC composite cross arm pole and tower. This paper conducts analysis and assessment to the risk (danger source) of damage to composite cross arm insulator during the construction by utilizing the risk evaluation method, and then proposes corresponding construction full-protection measures and counter measures targeting the assessment results.
Density and microstructural investigation of Ce:YAG ceramic subjected to powerful ultrasonic treatment during the compaction process
Authors: Paygin V D , Dvilis E S , Valiev D T , Khasanov O L , Stepanov S A , Vaganov V A , Alishin T R , Kalashnikov M P 
Published: February 2020

Abstract
The aim of the present work was to investigate the effect of the applied pressure, sintering temperature and ultrasonic treatment during the pressing process on the density and microstructure of translucent ceramics based on yttrium-aluminum garnet doped with cerium ions (Ce: YAG) obtained by conventional sintering of pressed compacts. The optimization of manufacturing conditions of the ceramics was carried out. It was shown that the ultrasonic treatment of initial powder in optimal sintering conditions leads to an increase in the relative density and grain size and decrease in the pore size of the sintered ceramics.
Effect of thermomechanical impacts on the deformation of thin polyimide films at uniaxial tension
Authors: Kupchishin A I , Taipova B G , Niyazov M N , Lisitsyn V M , Voronova N A 
Published: February 2020

Abstract
Thermomechanical studies of the dependence of deformation (ε) on time (t) and temperature (T) for various static stresses in polyimide under uniaxial tension were carried out. Temporal deformation curves for static stresses in the range from 75 to 110 MPa consist of two stages: 1 – increase; 2 – exit to saturation, which is associated with a change in the nature of structural transformations of macromolecules, due to the action of the static stresses. An increase in temperature and voltage leads to an increase in the dependence ε (T). This is due to the intensification of the processes of structuring macromolecules with increasing temperature and are supplemented by processes of breaking bonds between macromolecules, which increase the strain rate. Experimental data are described in terms of exponential and linear models.
Study on formation of aluminum alloy thin wall produced with WAAM method under various thermal conditions
Authors: Kisarev A V , Kobernik N V 
Published: February 2020

Abstract
The study reveals some formation aspects of a thin walls made by WAAM technology. The series of experiments about thin wall deposition in a various thermal condition was carried out. Temperature field finite element model was developed and solved under the giving conditions. Experimental results were treated after metallographic analysis, functional dependences of the width and height of the deposited layer by the temperature of the previous layer were constructed. In a range of 30-300 C sublayer temperature, layer height and width values show linear functional dependencies by sublayer temperature.
Numerical model of a hollow cathode arc discharge formation in vacuum
Authors: Permyakov G L , Trushnikov D N , Mindibaev M K , Koleva E G 
Published: February 2020

Abstract
Industrial application of hollow cathode arc (HCA) discharge necessitates understanding the processes of interaction between the plasma and the cathode and the anode, as well as related processes. The first step is to study the formation process of HCA discharge in vacuum with the micro-flow of plasma-forming gas through the hollow cathode. In this work presents a two-dimensional model describing the related processes of transfer of charged particles and the movement of plasma-forming gas flows. Electron density and mean electron energy are calculated by solving the drift-diffusion equations. The mass transfer equation for a multicomponent mixture is used to describe the mass transfer of heavy plasma particles. To calculate the electric field strength the Poisson equation is used. The emission of secondary electrons from the inner surface of the cathode is taken into account. The boundary conditions take into account the loss of charge as a result of chaotic motion and its occurrence due to thermal emission effects. The gas flow is determined by collisions and diffuse re-reflection from all surfaces assumed in accordance with Knudsen’s law. Calculations of plasma formation and the movement of plasma-forming gas flows were performed using the simulation package COMSOL Multiphysics.
Analysis of failures of bearings of axle box unit with polyamide cages and prospects of increasing their service life
Authors: Butorin D V , Filippenko N G , Livshits A V , Popov S I 
Published: February 2020

Abstract
The article analyzes failures of bearings of the axle box unit with polyamide cages and investigates the influence of climatic conditions on operational characteristics of cages. It is determined that the greatest number of defects during the operation of polyamide cages occurs in the following periods: summer-autumn, autumn, winter, winter-spring, spring. The revealed dependence of the operational properties of polyamide samples on weather and climatic conditions in different seasons of the year allows predicting the change in the operational characteristics of the cage and taking measures to restore and improve them. The authors proposed a method of restoration and improvement of operational properties of cages by processing them using a technique of high-frequency electrothermy. Full-scale tests showed the high efficiency of the proposed method, expressed in reducing the weight of the samples as a result of moisture removal, as well as in an ambiguous change in strength properties. Their ambiguity lies in the fact that cages differently restore their original hardness indicators after processing. And in the periods corresponding to winter and winter-spring, it was possible to restore strength indicators to a level even above the original one. For high-frequency processing of polyamide cages, a device has been developed that provides the required coverage of the workpiece electrodes on the upper, lower and inner side surfaces of the partitions. The test of the developed device made is possible to achieve the desired results, expressed in a significant decrease in the relative humidity of the cages and an increase in their strength characteristics by 7.6% of the initial level. All this confirms the practical importance and progressiveness of the developments presented in the work.
Determination of electromagnetic effects of electric traction networks on pipelines
Authors: Cherepanov A V , Kryukov A E 
Published: February 2020

Abstract
The article presents the simulation results of electromagnetic effects of a 25 kV electric traction network on a steel pipeline with a pipe diameter of 250 mm. It is shown that a pipeline with insulating pipe coatings can induce stresses dangerous to operating personnel. At certain points of the pipeline, grounded on both sides, the magnitude of the induced voltage can reach 116 V with an approach width of 100 meters. Therefore, it is required to develop and implement special measures to protect operating personnel. With an increase in the approach width to 400 m, the maximum values of the induced voltages did not exceed the permissible level. In modes of short circuits in the electric traction network, the induced voltages in the pipeline may briefly exceed 500 V. The highest voltages are observed at points located near the short circuit point. In case of short circuits at the terminals of the traction substations, the magnitudes of the induced voltages are reduced to 75 V. To reduce the induced voltages, the following measures can be assumed: reducing the length of parallel passage sections of pipeline and railway, increasing the approach width, installing additional groundings. During the operation of the structure, the magnitude of the “pipe-to-ground” transition resistance may decrease, which will result in a decrease in induced voltages.
Study of thermal zones in a heating collector of a traction motor NB-418 K6
Authors: Chuiko A D , Christosenkov S A 
Published: February 2020

Abstract
The article provides the data about functional dependencies affecting the heating characteristic of the traction electric motor (faulty soldering in the riser winding). Studies have shown the functional dependence of the temperature drop along the length of the riser (with the coefficient 0.95 %) that allows determining the functional dependence of the riser temperature on its length.
Methodology for evaluating of the interaction of wagons and path on the mountain-gorge areas
Authors: Yu Ermolenko I , Zheleznyak V N 
Published: February 2020

Abstract
In recent years, the number of rolling stock derailments, especially unladen wagons has begun to increase on railways located in hard geographical and climatic conditions in Eastern Siberia. In view of this, we propose the methods for evaluation of the interaction of wagons and railroad track for safety train movement and determination of appropriate schedule for train operation.
Simulation of an integrated public transport system by the example of a compact city
Authors: Lebedeva O , Poltavskaya Ju , Gozbenko V 
Published: February 2020

Abstract
The effectiveness of the transport network depends on the coherence of all message options. Suburban rail transportation and route bus service are travel options often used in medium and large cities in developed and developing countries. Integrating these two travel options reduces total travel time. The study will consider the application of the operational integration model of suburban trains and urban public transport. The model includes two submodels: routing and planning. In the routing submodels, public transport bus routes are generated that pass through the railway station. The planning sub-model will allow developing suburban train schedules with the optimal coordination of timetables for urban bus routes. As an example, the railway station Angarsk and the urban route network are considered. Bus transportation is coordinated with the existing railway timetable for the arrival of local trains. Genetic algorithms are robust optimization techniques and can be used in planning submodels. The result of the study is to determine the routes that require changes in the timetable, taking into account the arriving trains.
Calculations of efficiency in implementing progressive mold forming methods
Authors: Yu Konyuhov V , Gladkih A M , Galyautdinov I I , Shchadova E I 
Published: February 2020

Abstract
The article provides a classical prime cost accounting, outlining steps for calculating the cost at production site. The calculations compare two methods of manufacturing titanium parts for the aviation industry. The first method uses the mold forming by drop forging and the second one uses a modern superplastic manufacturing technology. This comparative calculation will determine the price of production of one set of parts for the SU-30. The considered methods of manufacturing parts will show the prime cost of production and will draw conclusions on further cooperation between Irkutsk Aviation Plant and Irkutsk State Technical University in the field of titanium products mold forming for modern aircraft.
Information systems of passenger transportation forecast in Transbaikal region
Authors: Kriklevskaya L Y , Kuklina O K , Mihailova E A , Yahina A S 
Published: February 2020

Abstract
The paper is concerned with the qualitative assessment of socio-economic development of transport industry of the region made with a help of information systems and mathematical methods. The object of this study is a railway transportation system in Transbaikal region. The research was made on the basis of a priori and posteriori approach with the use of recessionary analysis and correlation. The research of basic trends in socio-economic development of Transbaikal region during a long period of time (10 years) comprising the periods of growth and stagnation made it possible to reveal a set of models which affects the volume of transportation. This will help to forecast a strategy of development of Transbaikal region. The article contains the results of empirical study on interconnection between a set of factors and a volume of passenger transportation in Transbaikal region.
Research on ecologically safe flokulants in clay fluid fluids
Authors: Averkina E V , Shakirova E V , Butakova L A 
Published: February 2020

Abstract
Currently, a large number of flocculants differing in properties and composition and working differently in various conditions is manufactured. Drilling fluids are complex systems differing in component composition, thus, it is not possible to recommend a universal flocculant. The present study carries out the analysis with the use of two methods with the objective to assess reagents’ flocculating ability. Having analyzed the results obtained, the following conclusions can be drawn: the reagents BENEX, BENTOPLUS and DRB-9 can be used to increase the clay solution viscosity provided that the additives BENTOPLUS and DRB-9 do not exceed the concentration of 0.2 kg/m3; in a concentration of up to 0.1 kg/m3 flocculant SPECFLOC A 7950-20 can be used to increase a clay solution viscosity, at a concentration of 0.2 and 0.3 kg/m3 the additive affects a drilling fluid mainly as a flocculant, thus, reducing the static shear stress of the solution and increasing filtrate flow. If dynamic shear stress is the only determining parameter in drilling with drilling fluid with SPECFLOC N6919 additive, then it can be recommended for being used. In all other cases additional research is required.
Advanced technologies of international cargo correspondence in railway transport
Authors: Zubkov V V , Sirina N F 
Published: February 2020

Abstract
The technologies of formation of transportation documents and preliminary informing in the international traffic are the primary directions of improvement of information technologies of interstate transfer points both for the information systems of state control and regulation and for the information systems of the subjects of transportation services. In the railway transport system of the Russian Federation the model of formation of transportation documents and preliminary information has a number of distinctive features from the existing model of the world practice. The article analyzes and determines the possibility of development and interaction of information systems of state authorities, owners and consumers of transport services in a single information space, methods of their consolidation and integration into international transport corridors. Automation of technological operations on processing of transport documents and preliminary informing by creation and introduction of innovative developments in the field of management of process of technological interaction of participants of transport - providing services is considered. The automated system of processing of transportation documents for imported cargo with barcoding and the automated system of informing cargo owners about the approaching expiration date of the phytosanitary certificate are presented and proposed for use at the interstate junction points. The proposed information systems improve and optimize these technologies, accelerate trade turnover and ensure the implementation of projects for the development of a common information space in the segment of international traffic and the development of transport international relations in general. The systems have undergone states registration.
Coordination of the microwave module used in the Doppler meter of the velocity vector components
Authors: Trushnikov V E , Valitov R R , Grishin M V 
Published: February 2020

Abstract
The article describes a method for coordinating the microwave path and verifying the microwave module of the DMVC. The method for coordinating and adjusting the microwave module helps measure and evaluate characteristics of the device to confirm compliance with the DMVC requirements.
Analysis of stresses and deformations of elements of axle boxes and improvement of their shape
Authors: Tsvik L B , Tarmaev A A , Bocharov I S , Eremeev V K 
Published: February 2020

Abstract
The development of constructive recommendations aimed at increasing the service life of roller bearings of axle boxes of railway cars is described. The elastic volumetric stress-strain state of the bearing elements of the bearings under consideration is analyzed. Numerical analysis of the corresponding mathematical models was carried out using the finite element method in the NX NASTRAN software environment. It is shown that near the edge of the roller with chamfer-rounding, a stress concentration arises, caused by insufficient smoothness of the contour line of the axial section of the roller. It is noted that this concentration is caused by the fact that the line of the contour under consideration has a finite specified curvature in the section corresponding to the chamfer and almost zero curvature in the adjacent straight section corresponding to the cylindrical surface of the roller. It is shown that the use of smoother contour lines for the marginal zone of a roller more than doubles the maximum value of the stress intensity in the boundary zone under consideration and accordingly increases the cyclic life of the bearing. The proposed smoothing of the line of the considered circuit allows one not only to unload the edge of the roller but also to reduce the contact pressure in its middle part. At the same time the stress-strain state of the roller becomes more uniform by increasing the smoothness of the contour line in the area of the roller’s edge and simultaneously reducing the degree of bombing (barrel-shaped) its cylindrical surface.
Assessment of contribution of human factor and factors of material-technical supply to safety risks due to poor repair and technology
Authors: Verevkina O I 
Published: February 2020

Abstract
The paper discusses the method of assessment and analysis of functional risks within the infrastructure of the railway transport network. The basis of the method is laid down in [1-4], but the risk assessment subsystem was not described due to poor repair. This paper will try to fill this gap. A general diagram of traffic safety risks by factors was developed. The method of transforming the probability function of repair rules violation into the probability of traffic safety violation due to some repair is proposed. For this purpose, the problem of minimizing the disparity in non-linear equations determining scaled factors of traffic safety violation (TSV) due to re-pair is solved. The calculation results at the level of linear enterprise are presented.
Use of Exclusive Enteral Formula Diet as Adjunctive Therapy for Treatment of a Crohn’s Disease Flare
Authors: Teigen Levi M , Johnson Abigail J , Shmidt Eugenia , Vaughn Byron P 
Published: February 2020

Abstract

Introduction
We report the case of an adult patient who achieved remission of a Crohn’s disease flare after treatment with exclusive enteral nutrition as adjunctive therapy to medication.

Case Report
A 46-year-old man with severe, stricturing Crohn’s presented for severe abdominal pain and weight loss; estimated Crohn’s Disease Activity Index score greater than 300. Antibiotics, vedolizumab, budesonide, and exclusive enteral nutrition diet were instituted. Approximately 30 days later, his Crohn’s Disease Activity Index score improved to 170.

Discussion
This case illustrates the possible utility of an exclusive enteral formula diet as an adjunct to medication to induce remission of a Crohn’s disease flare.
Robotic mitral valve repair for rheumatic mitral stenosis and regurgitation: a case report
Authors: Yajima Shin , Fukushima Satsuki , Kakuta Takashi , Fujita Tomoyuki 
Published: February 2020

Abstract

Background
Rheumatic mitral valve (MV) disease is the major cause of congestive cardiac failure in children and young adults, particularly in developing countries. Mitral valve repair with minimum prosthetic material is the gold standard treatment for this condition. However, MV repair for rheumatic MV disease is known to be technically demanding.

Case summary
A 27-year-old woman without a history of cardiac disease presented with dyspnoea on exertion. Echocardiography revealed rheumatic severe mitral stenosis and regurgitation, with thickening of the bileaflets, doming of the anterior leaflet, shortening of the posterior leaflet, fusions of the lateral and particularly the medial commissure, and enlargement of the mitral annulus. We successfully performed robot-assisted MV repair with bicommissural release, patch augmentation of the two leaflets, and implantation of an originally sized partial band.

Discussion
Robotic MV repair can contribute to precise valve inspection and operative procedures. This approach seems feasible for complex rheumatic MV disease particularly in young patients.