bluuebunny/crossref_metadata_2025_split huggingface dataset:
Development of passive protection devices for a power head of a high-speed multiple unit train at its collisions
Authors: Sobolevska M , Horobets D , Syrota S 
Published: December 2020

Abstract
Ukrainian passenger multiple-unit train upgrading supposes on creation of new power heads with passive safety systems (PSS) to save passengers lives, to reduce rolling stock damage and to minimize consequences at collisions. The purpose of this research is to develop energy absorption devices (EADs) for power head PSS according to DSTU EN 15227. EAD 1, EAD 2, EAD 3 designs have been developed with using successful experience of EP20 locomotive EADs creation and EAD prototype crash test results. EAD 1 design includes two elements which are located sequentially. Element 1 is a box with a single-layer package of hexagonal honeycombs inside. Element 2 is a truncated pyramid of honeycombs with triangular cells. EAD 2 design has three steps in element 2 form. EAD 3 design has been developed on the basis of element 1. It has been recommended to install two EAD 1 in a power head frontal part at the coupling level, two EAD 2 in power head window-sill part and two EAD 3 in the inter-car connection at the coupling level. Finite element simulation of EAD plastic deformation at an impact has been carried out for determination of design parameters.
Choosing of Asynchronous Motor Protection Equipment in Production Environment
Authors: Kuznetsov V V , Tryputen M M , Kuznetsov V G , Tryputen M , Kuznetsova A , Kuznetsova Y 
Published: December 2020

Abstract
The current article is devoted to the topic problem of decision making concerning the choice of the protective means for asynchronous motors operated within industrial shop electric circuits under challenging conditions of improper electric supply. In this paper we show how energy economizing model for the asynchronous motor can be presented in the form of predicate disjunction and be applied with the pattern recognition algorithm for making solutions. The major advantage of a new model is its open character and the possibility of knowledge accumulation with respect to electromechanical equipment. We submit the information on the software and hardware complex applied for the research on the characteristics of the circuit voltage and the asynchronous motors in the real time mode directly within the enterprise industrial shop. The publication also reports on the searching for the best protective solution for asynchronous motors. This work is based on the known recognition algorithm of statistical optimization for non-linear objects given as the aggregates of predicates. The algorithm fruitfully applies the local selection principle. The approach proposed in this publication has been approbated at the protective means selection procedure for the asynchronous motor of 7.5 kW capacity, which performance is 80% of the working cycle under conditions of improper electric energy supply in the experimental shop of Ukrspetsservis.
Formulation of the mathematical model for the planning system in the carriage of dangerous goods by rail
Authors: Bibik S , Strelko O , Nesterenko H , Muzykin M , Kuzmenko A 
Published: December 2020

AbstractThe paper aims to the topical issue of improving the system in the planning of carriage of dangerous goods by rail subject to ensuring a high level of safety of the transport process and minimal costs for its implementation. Formalization of this process leads to the formation of an optimization task of the two-stage mathematical model. To implement the first stage, a mathematical model in searching the best route based on risk minimization is developed. In order to exclude the unacceptably complex and expensive options for the carriage of dangerous goods from the many possible routes, the authors abided by the condition not to exceed the critical operating costs. The second stage in the process of planning routes for dangerous goods takes into account the hazard identification study in the technological process of car movement with dangerous goods. Considering that the probability of a potential traffic accident is a complex random variable, which is due to a set of elementary previously unknown events, its estimation was made on the basis of the Bayesian approach. Based on the simulation results, the following reliability values are determined at which a transport accident should not emerge.
Coefficient of stability against lift by longitudinal forces of freight cars in trains
Authors: Shvets A O , Shatunov O V , Dovhaniuk S S , Muradian L A , Pularyia A L , Kalashnik V V 
Published: December 2020

AbstractThe paper is devoted to a theoretical study of the car movement stability when exposed to longitudinal forces of a quasistatic nature. The authors obtained the expressions for calculating the resistance coefficient of the car lift by the longitudinal compressive force acting on the car as part of a freight train. The influence of some factor’s combination on the longitudinal forces, at which the car movement stability is still maintained, was analyzed using the analytical dependencies to assess the longitudinal loading of cars in trains. The study was carried out by analytical method for assessing the freight car stability when moving at different speeds along curved track sections. The calculations were made in a curve of small radius taking into account the inertia forces from the unbalanced acceleration. In a theoretical study, the influence of quasistatic longitudinal compressive forces depending on changes in speed and force value, as well as the influence of friction in the wheel flange and rail contact and the eccentricity of fastening the automatic coupler shank on the stability were considered. When applying the results obtained, the stability of freight rolling stock can be increased, which in turn will remove some existing restrictions on the permissible speeds and increase the technical speed of train movement. Using the described methodology for determining the lift resistance coefficient will make it possible to justify the cause of derailment, as well as to develop and put into practice technical measures to prevent the lift of carriages, thrusts and shears of the track.
Study of strength characteristics of the long wheelbase flat cars
Authors: Fedosov-Nikonov D V , Sulym A O , Ilchyshyn V V , Safronov O M , Kelrikh M B 
Published: December 2020

Abstract
Transportation of goods in large containers with loading length of 80 feet is one of the promising directions of railway transport development. However, despite considerable experience in construction of long-wheelbase flat cars, occasionally problems with the strength of load-bearing elements arise at the calculation, design and manufacture of such products. The article presents the technical characteristics of a long wheelbase flat car, as well as the results of experimental studies of fatigue tests of its load-bearing elements. The optimization of the design of the long wheelbase flat car was achieved both by increasing the sizes and shapes, and by using materials of increased strength. An analysis of the study’s results of an improved design showed the compliance of the values of the safety factor of fatigue strength and the service life of the flat car with regulatory and technical documentation. The conducted studies allow us to make recommendations regarding the design, rebuilding and testing of long wheelbase flat cars. The primary results of fatigue tests of the main load-bearing structural elements within the scope of experimental studies turned out to be mostly below acceptable values. This article contains facts confirming it. The results of experimental studies to determine the fatigue strength proved that the design elements require improvement and strengthening.
Improvement of diesel injector nozzle test techniques
Authors: Aulin D , Klymenko O , Falendysh A , Kletska O , Dizo J 
Published: December 2020

Abstract
Due to changes in the characteristics of the fuel equipment during operation, a considerable part of the life cycle of locomotive engines operate under increased fuel consumption, and thermal voltage, which often causes degraded environmental performance and reduced engine capacity and, as a result, low efficiency of the locomotive. A reserve for improving the performance of the diesel plant and the diesel locomotive in general is the implementation of measures to prevent changes in the characteristics of the fuel system, for example, the development of clean-in-place technique of fuel systems from carbon deposits. In order to determine the effectiveness of such measures, it is necessary to apply new quality control methods of fuel atomization. The article offers a more informative method for evaluating the quality of fuel atomization, which can be used in locomotive depots during research and development work. The method consists of microphotography of the drops of sprayed fuel followed by microscopic analysis and processing of the results using special software. It is proposed to process the results of injectors testing using a statistical method, taking into account the parameters according to the Rosin-Rammler dependence for the relative total curve. As a result of the work, it became possible to develop requirements and implement technical improvements to the test stands for fuel equipment of diesel locomotives.
Analysis of physical and chemical transformations during thermal spraying of coatings based on carbides of tungsten and chromium
Authors: Kharlamov Yu O , Sokolov V I , Krol O S , Romanchenko O V 
Published: December 2020

Abstract
The formation of structure and properties of thermal coatings is largely determined by the transformation intensity of sprayed materials at all stages of obtaining of coating. It is shown that during D – gun spraying, in order to ensure optimal conditions for leading transformations and phenomena that have a decisive influence on structure and properties of sprayed coatings, composition of combustible mixture, geometry and dimensions of barrel, conditions for introducing powder into the barrel and a unit dose of powder, spraying distance, timing of spraying cycle and other technological methods can be used. The possibility of transformation in powders of tungsten carbide and chromium under different methods of thermal spraying is analyzed and the structure and properties of coatings are obtained. The influence of the conditions of D – gun spraying on spraying distances, gas flow rates, type of powder, etc.; phase composition and properties of coatings is studied. The basic physicochemical transformations that accompany D – gun spraying of coatings of alloy WC – C, such as oxidation and reduction of tungsten carbide in high – temperature oxygen – containing media, interaction of composite coating components are considered problems of modelling of bonding of particles with a part surface during thermal spraying of coatings are considered.
Technology of soil compaction of the base of the track with vibrating static machines of blocking action
Authors: Hlavatskyi K , Cherkudinov V , Posmitiukha O 
Published: December 2020

Abstract
The directions of combination of working bodies in the existing soil compactors and machines of the new generation and the technologies of their application for productive and effective soil compaction of the lower track structure, soil structures of roads and other construction objects are given. The basis of the research is the principle of accelerated soil compaction due to the creation on the surface of the contact with the working bodies of the sealing machines pressure, which exceeds the limit of plasticity of the soil and at the same time limiting the slipping of the sides from under the working sealing surface. It is proposed that the working sealing surface modular type that can change its profile depending on the technological requirements. Further research is aimed at creating the required profile of the working body based on the desired compaction core and the structural formula of the working body of the soil compactor. In this case, replacing the elements in the working bodies with the corresponding mathematical models, we obtain a common mathematical model of the working body of the soil compactor, as well as the profile of its working body, based on the specified energy consumption and technological requirements.
Higher efficiency of control over functional status of locomotive crew members
Authors: Brusentsov V , Puzyr V , Vorozhbiian M , Ivashchenko M , Datsun Yu 
Published: December 2020

Abstract
The objective of the study is research into psycho-physiological methods of control over the functional status of a person for higher efficiency of a pre-trip control of locomotive crew members. It is related to the fact that today’s medical methods do not reveal some states which decrease a functional reliability level, particularly, a fatigue level and borderline states. The authors selected parameters which, according to the functional system theory, give information on conditions of two regulation levels in the human body, physiological and higher nervous activity, and correspond to the formulated requirements in terms of the procedure. The study experimentally proved the informative value of 27 psycho-physiological parameters for estimation of exhaustion and borderline states. For a state of exhaustion the hemodynamic parameters, including those of arrhythmia, both sinus and slow waves, were of the most informative value. The study revealed the parameter of arterial pressure pulse, the value of which in the post-trip group decreased by 25%. While identifying existence of borderline states by sinus arrhythmia parameters, it turned out that much more people with borderline states were in the exhaustion zone, rather than in the control group (42% and 16% respectively).
Design, fabrication and analysis of compaction die for powder processing
Authors: Sharma Avadesh K , Singh Rajeev , Tiwari Arun K , Sharma Ajay K 
Published: December 2020

Abstract
A compaction die has an essential role in the powder metallurgy process due to the controlling and ease of processing. The shape and properties of die can significantly affect the features of the final part as the several steps and assessments are involved before design and fabrication of compaction die. This work is an effort to design and manufacture a compaction die that can successfully use for uni-axial compaction of NiTi powder. The design and development of die includes design consideration, 2D drawing, 3D model and processes involved in the fabrication of die. The die design was analyzed by ANSYS 19.1 software in a simulated environment, and the fabricated die was tested experimentally by preparing the composite sample successfully at 1000MPa compaction pressure using universal testing machine. Further, the compaction behaviour, density, compressive strength and hardness of developed NiTi composite have also evaluated.
Heuristics based hybrid approach of flow shop scheduling problem
Authors: Lokesh K , Jayaprakash J , Alene Tibebu 
Published: December 2020

Abstract
In recent day’s furniture fabrication industries are one of the upcoming segments in developing countries. In the fast-developing economy and populations are substantial interest in house hold furniture and wooden games things. Almost around more than 100 medium and large furniture businesses are running in every district capital. Presently they are confronting additionally testing undertakings in adjusting of cycle arranging and assembling products based on customer requirements. In this paper, we have taken scheduling issues related with these enterprises. In the case company contain a set of tasks to be carried out and optimize make span with a set of machines available to perform those jobs. So as to lead important information writing study on past investigations, we proposed heuristics-based hybrid approach of flow shop scheduling problems to assess the make span. At last, we verify the outcomes of the hybrid approach with LEKIN programming.
Novel approach to enhance network security using key performance indicator in business analytics
Authors: Saranya M. , Anithaashri T. P. 
Published: December 2020

Abstract
In Recent days, the challenges in Business applications are more in analyzing the complexities of day to day activities. Key execution pointer (KPIs) are business estimations used by corporate bosses and various directors to follow and examine factors thought about noteworthy to the achievement of a Business. Reasonable KPIs base on the business cycles and limits that senior organization sees as commonly huge for assessing progress toward meeting imperative destinations and execution targets. KPIs differ from relationship to affiliation subject to business needs. One of the key display pointers for an open association will likely be its stock expense, while a KPI for a covertly held startup may be the amount of new customers incorporated each quarter. Surely, even direct adversaries in an industry are likely going to screen different plans of KPIs specially designed to their individual business procedures and the leader’s strategies for thinking.
The influence of thermodynamical characteristics of high speed steels on temperature and forces values when turning construction steel
Authors: Beskopylny A N , Fominov E V , Shuchev C G , Egorov M S 
Published: December 2020

Abstract
The article is devoted to the critical problem of studying the dependencies of temperature and cutting forces on the entropy of tool materials (high-speed steels - HSS). The high wear resistance of the cutting tool is closely related to the entropy of tool materials. However, the relationship of entropy as structural sensitive characteristic with temperature and forces during machining processes is poorly investigated. The experimental studies were carried out on the engine lathe with an infinitely variable regulation of spindle rotation frequencies, equipped with a measuring complex, allowing cutting forces and temperature recording at different cutting speeds. It has been established experimentally that at all cutting speeds in the studied range the smallest values of cutting forces and contact temperatures were characteristic for cutting tools made of HSS with high levels of thermal entropy. Thus, the thermal entropy of HSS can be used to the preliminary assessment of relative values of cutting forces and temperatures during the processing of steels which characteristics are strongly connected with wear rates and reliability of cutting tools.
Determination influence of graphite grade on tribological properties of friction material based on tin bronze when using “A” and ATF-III grade oils
Authors: Biryukov V P , Ilyushchenko A F , Leshok A V , Rogovoy A N 
Published: December 2020

Abstract
The paper presents the results of metallographic and tribological studies of tin bronze samples with additives of elemental graphite (GE) and pencil graphite (GP) with an average size of 10 μm in an amount of 10% vol. The wear rate of bronze samples with graphite GI is higher than with GP by 2 times when tested with mineral oil and 1.1 times when tested with synthetic oil. The jamming load is 1.5-2 times higher than bronze with GP graphite compared to bronze without graphite.
Procedures for measuring thickness of lubricating film using capacitive method on Amsler-type friction machines
Authors: Darovskoy G V , Polyakov V N , Opatskikh A N 
Published: December 2020

Abstract
A technique has been developed for measuring the thickness of a lubricating film by the capacitive method on Amsler-type friction machines. A diagram of the implementation of the original device for solving the problem is described, a method for its calibration is described. It was experimentally established that the applied method is highly stable in the results obtained in a wide range of measured values.
Artificial applicability labels for improving policies in retrosynthesis prediction
Authors: Bjerrum Esben Jannik , Thakkar Amol , Engkvist Ola 
Published: December 2020

Abstract
Automated retrosynthetic planning algorithms are a research area of increasing importance. Automated reaction-template extraction from large datasets, in conjunction with neural-network-enhanced tree-search algorithms, can find plausible routes to target compounds in seconds. However, the current method for training neural networks to predict suitable templates for a given target product leads to many predictions that are not applicable in silico. Most templates in the top 50 suggested templates cannot be applied to the target molecule to perform the virtual reaction. Here, we describe how to generate data and train a neural network policy that predicts whether templates are applicable or not. First, we generate a massive training dataset by applying each retrosynthetic template to each product from our reaction database. Second, we train a neural network to perform near-perfect prediction of the applicability labels on a held-out test set. The trained network is then joined with a policy model trained to predict and prioritize templates using the labels from the original dataset. The combined model was found to outperform the policy model in a route-finding task using 1700 compounds from our internal drug-discovery projects.
Stable near white light emission in CsPbCl3 perovskite quantum dots by incorporating Al3+/Mn2+ ions
Authors: Padhiar Muhammad Amin , Wang Minqiang , Ji Yongqiang , Zhou Yun , Qiu Hengwei , Yang Zhi 
Published: December 2020

Abstract
All inorganic cesium lead halides (CsPbX3, X = Cl, Br, I) are promising materials and have been developed in recent years for various optoelectronic devices and applications because of their excellent optoelectronic properties. Regardless of their excellent characteristics their stability is still uncertain and it is challenging task to obtain stable emission in CsPbX3 perovskite quantum dots (PQDs), hence limiting their practical optoelectronic application. In this context, several approaches have been used like an-ion exchange, ion doping, and core–shell structure to enhance PQDs stability. Herein, we synthesized dual ion co-doped Al3+/Mn2+ CsPbCl3 PQDs for stable light emitting diodes through traditional hot injection method for the first time. By adjusting molar concentration of Al3+/Mn2+ CsPbCl3, co-doped PQDs were successfully prepared. The co-doped PQDs exhibit tunable emission, covering a wide range under UV excitation. Moreover, these high luminescent co-doped PQDs were used to fabricate WLEDs, displaying stable near white light emission with the chromaticity coordination at (0.35, 0.28). Some new evidence has emerged, although some aspects of Mn2+ and Al3+ doping are considered to be consistent with previous conclusions. This viewpoint incorporates all of these details and focuses on the path of transition metal ion doping to perovskite nanostructures and offers an overview for possible potential studies.