bluuebunny/crossref_metadata_2025 huggingface dataset:
A Comparative Analysis on Artificial Intelligence Techniques for Web Phishing Classification
Authors: Balqis binti Tengku Abd Rashid Tengku , Sallim Jamaludin bin , Muhamad Noor Yusnita binti
Published: June 2020

Over the last few years, the web has been expanded to serve millions of users for various purposes all over the world. The web content filtering is essential to filter offensive, unwanted web content from web pages, reduced inappropriate content to prevent access to content which could compromise the network and spread malware. It also to tightened network security where web content filtering adds a much-needed layer of security to the network by blocking access to sites that raise an alarm. However, there are lack of comparison between classification techniques in previous studies in order to find the best classifier for the web page classification and the analysis related to it. Thus, the purpose of this study was to apply web page classification techniques and their performances is compared as it is the initial step in data mining before going to web filtering. In this project, three classifiers called Artificial Neural Network, J48 Decision Tree and Support Vector Machine were used to web phishing dataset in order to find the best possible classifier with small computational efforts that will give the best result in classifying the web page.
On the question of the rational behavior of firms in the market of technical services in the field of the autogas system
Authors: Egorov V A , Bespalchaya E N , Panov Yu V , Egorova T N
Published: June 2020

The article presents new approaches to formalizing and evaluating the actions of market participants in technical services in the field of installation and maintenance of the autogas system in order to determine the rational boundaries of a number of characteristics of the behavior of these firms-players in the market. Currently, a wide range of gas equipment is produced for installation on cars, which has a wide range of consumer properties. This diversity makes it difficult for consumers to choose these products, being faced with the task of determining the nomenclature of models of autogas kits, their required number depending on various input parameters – the market environment in which the considered service station operates, the power of the service station focused on the gas market segment, etc. To solve the above problems, it is proposed to evaluate the market potential of a particular kit of AGS, goods offered to the consumer-owner of the car, which is an essential characteristic that determines the priority of inclusion (or exclusion) of a set in the gas equipment nomenclature at a particular service station. To determine the predicted effectiveness of certain decisions, the article proposes the formalization of the described market processes and the construction of a mathematical model of the market participants’ behavior depending on different influence factors, the behavior of the components included in the complex objective function and the creation of an algorithm and software for finding rational solutions.
Quality research of paintwork of Volkswagen Tuareg car body elements
Authors: Kipriyanov F A , Shushkov R A , Mikhailov A S , Kuznetsova N I , Gaididei S V , Barinova O I
Published: June 2020

Appearance is one of the criteria forming the aesthetic perception of a particular vehicle. However, the appearance of the car is a factor determining the consumers’ opinion about the brand of the car. Many vehicles during their operation for many different reasons undergo repair and restoration operations. As a rule, repairing body elements the paintwork is performed, the quality of which and the observance of technologies and standards during work ultimately determine the durability of the paintwork. The quality of the paintwork, the presence of damage, fragments of destruction is one of the essential aspects that interest consumers in the secondary market. The article presents the results of a study of the paintwork quality of the Volkswagen Tuareg car body elements; the presence of defects is identified, the causes of their occurrence are detected.
The results of modeling and evaluating the dynamics of the active semitrailer
Authors: Sova A N , Mazlumyan G S , Egorov O V , Eruslankin S A , Shadrin S S
Published: June 2020

The article describes the results of modeling and evaluating the dynamics of an active semi-trailer. It presents the developed blocks for calculating the vertical reactions of the semi-trailer, the projections of the gravity of the semi-trailer, and the aerodynamic drag forces of the semi-trailer, trailer, the angle of rotation of the wheels of the semi-trailer, the dynamics of the body of the semi-trailer.
Improving the efficiency of diagnostics and repair of ICE and road construction machinery in ISTK
Authors: Stepanov D , Krasnov Yu , Antonov D.
Published: June 2020

This article contains analysis of possible ways to improve the efficiency of diagnostics and repair of internal combustion engines using information systems. Common repair methods for these machines are reviewed here. The analysis revealed disadvantages, which increase, time and cost of repairs. The lack of computerized workplaces reduces the productivity of engine repair department. As a solution to this problem, it was proposed to equip the mechanics’ workplace of the ICE service department with a computerized widescreen LCD panel and a tablet with preinstalled software. This system allows to control the work process in real time. The system increases the productivity of the service department, reduces costs and time for diagnostics and repairs. The system also allows to analyze the possibility of reusing spare parts.
Problems of digital diagnostics for prospect of autonomous vehicles implementation
Authors: Yashina M V , Ngoulou-A-Ndzeli
Published: June 2020

This article outlines the principles and problems associated with the development of intelligent transport systems and, in particular, new trends in the creation and implementation of unmanned vehicles (autonomous vehicles). The alliance between technological evolution and the automotive industry allows us to highlight emerging and future challenges for smart vehicles. In the context of autonomous vehicles, there are a number of issues that need to be addressed. It is assumed that such vehicles must be reliable; therefore, real-time diagnostic issues are relevant. At the beginning of the article, a global vehicle model is considered. Further discusses a management strategy that provides recommendations for the development of diagnostic measures for AV. The results of high-precision joint modeling shown in the article prove the effectiveness of the proposed control technique and new opportunities.
Use of self-recovering slowly-hardening concrete to ensure the longevity of highways
Authors: Asmatulayev B A , Asmatulayev R B , Asmatulayev N B
Published: June 2020

At the beginning of this century, the new requirements for the durability of highways are made according to the modern concepts of the US and EU. The article describes the main results of theoretical, experimental studies and long-term monitoring of highways’ sections, built using the self-recovering road concretes that meet the new requirements. The durability of road concretes substantiates the results of physical and chemical studies, physical and mechanical tests of various compositions of belite cements, concrete and concrete cores. It was shown that the strength of the concrete continues to increase for more than 39 years of roads’ maintenance. It is assumed that the path to durable «Roman concrete» is found.
Use of ceramic dust waste in the composition of road plates
Authors: Himich T S , Matveev S A , Utkin V A , Kadisov G M
Published: June 2020

The use of industrial waste – ceramic dust in the production of cement concrete mixtures is considered. A comparison of the characteristics of ceramic dust and building sand is done. The analysis of the physicomechanical characteristics of the cement-concrete mixture with a ceramic dust content of 10 and 50 % of the amount of building sand in the mixture was performed. Samples from this mixture were tested in a certified construction laboratory. It is shown that the use of ceramic dust in the composition of the cement-concrete mixture as a filler increases the average concrete strength up to 44 %, without significantly changing neither its structure, nor other physicomechanical properties. The possibility of using cement-concrete in construction practice, in which 50 % of sand is replaced by waste, has been proved.
Application of the speed prediction model (V85) (V85) in the design of freeway interchanges
Authors: Jafarov R M , Zaluga V P
Published: June 2020

The design of freeway interchanges is performed on the basis of technical and economic comparison of options for a large number of indicators. Design decisions depend on a large number of factors: the class of intersecting streets and roads, the level of service, traffic intensity, the estimated speed at the ramps, terrain, urban development, hydrogeological conditions of construction, etc. An integral indicator of the quality of design decisions is the maximum safe speed. In most countries of the world, the speed of single passenger cars is 85 % of the security (V85), which may differ from the calculated speed at the maximum safe speed. In the article, on the basis of experimental data, empirical models for calculating speeds (V85) are obtained at freeway interchanges with directional ramps. Experimental studies were performed at freeway interchanges in the city of Moscow using a car laboratory according to the method of following the leader, as well as by processing video from a quadrocopter. The results of the study make it possible to predict the speed of movement (V85) at the ramps of freeway interchange and to compare the freeway interchanges schemes according to the criterion of speed, loss of time, relative safety and traffic capacity.
Comparative assessment of the technological properties of mastic and sulfur-mastic asphalt concrete mixtures
Authors: Kotlyarski E V , Vasilev Y E , Kochnev V I
Published: June 2020

The technological properties of mastic and sulfur-mastic asphalt concrete mixtures have been evaluated. The hypothesis has been confirmed that the compositions of mastic asphalt concrete mixtures with crystallization-coagulation structure have increased fracture resistance. Optimal technological modes of producing and paving are recommended.
Development of the formulas for estimating the travel time of rainwater slope runoff and channel flow for the anthropogenic territories of small catchment basins
Authors: Prakash Paudyal Soorya , Sokolova K Y , Chistyakov I V
Published: June 2020

The article presents developed formulas for estimating the travel time of rainwater slope runoff and channel flow based on a unified schematization of mixed catchment basins with wide anthropogenic territories together with diversion channels. The estimation of common travel time for the rainwater overland flow on the adjacent watershed and further along the diversion channel is derived by modeling the catchment basins preserving their natural configurations. The necessary hydrological and hydraulic equations for describing the unsteady rainwater slope runoff and channel flow formation are chosen and proposed taking into consideration the proper factors affecting the flow. When developing a general formula for calculating the preliminary total travel time of the slope and channel flow have been taken into consideration the proper patterns of rainwater runoff on the inclined surfaces and stepped sectors applicable for estimation of the unsteady slope runoff and channel discharge (flow rate) in case of using the differential equations of one-dimensional hydraulics. The developed formula can be used for determining the travel time in predicting rainwater runoff for designing the system of road surface drainage and culverts facilities in mixed catchment basins with terraced paddy fields and other slope areas. Authors have proposed some recommendations and drawn the relevant conclusions.
Using foam polyurethane sealers for strengthening of soils of a road bed of transport constructions
Authors: Polyntsev E S , Kvitko A V
Published: June 2020

The article presents an overview of the methods of producing alternative building materials by strengthening soils with organic binders based on synthetic resins. Their use in road construction would meet the needs of construction organizations in high-quality building materials and ensure reliable operation of soil masses of subgrade road transport structures throughout estimated service life. The authors proposed a new, alternative method for soil stabilization using urethane foam sealants, which have proven themselves in civil engineering in the form of mounting foams. The paper describes a method for strengthening soil with sealants, its labor production technology, properties and physical and mechanical characteristics. The results of the trial experience of soil strengthening with polyurethane foam sealant are described and conclusions are made based on the work.
Field evaluation of rutting in concrete pavements
Authors: Ushakov V , Jelagin D , Dyakov G , Dmitriev S , Goryachev M
Published: June 2020

Surface wear by studded tires is a primary cause for rutting in portland cement concrete (PCC) pavements, and may, for the pavement sections with high traffic intensities, become a primary factor controlling the length of pavements maintenance intervals. In the present study, PCC pavement field performance with respect to surface wear is examined based on the transverse surface profile measurements performed yearly during first five years of pavements service life. Continuous transverse surface profile measurements have been performed yearly on a 20 km long rigid pavement section in Moscow region, Russia. Based on the measurements, quantitative parameters describing rut depth evolution are obtained and evaluated; the obtained results are discussed in context of previous research findings reported in the literature. The effect of pavement surface wear on the further rutting accumulation rate is examined. The particular attention is also given to the spatial variability of the measured pavement surface wear characteristics, i.e. rut depth and accumulation rate. The implications of the obtained results on the length of rigid pavement maintenance intervals are discussed.
Improvement of research methodology and reliability assessment of roads at design project and project documentation development stages
Authors: Bazhanov A P , Saksonova E S
Published: June 2020

The article touches upon the issues of the improvement of research methodology and reliability assessment of roads at engineering design and project documentation development stages. As a result of the study, the analytical expressions are obtained in order to improve the research methodology and assess the reliability of roads at the stages of the implementation of engineering project and the development of project documentation, using correcting coefficients, taking into account random errors in the numerical values of constituent quantities in the analytical expressions, which are functions of independent random arguments that determine the impact on these components of the magnitude of random weather and climate factors and conditions of vehicle movement during the operation of roads, as well as some corrections for non-linearity and the probabilistic dependence of these components in these analytical expressions. These analytical relations also take into account the obtained design estimates of the reliability of roads using statistical modeling procedures for calculating the reliability indicators of a specific category of road in a one-dimensional setting. In this work, the authors propose the use of a new probabilistic - statistical approach to the assessment of the reliability of roads, taking into account the risk of destruction of road structure during its usage. The results of the study allow concluding that the main provisions for the improvement of the research methodology and assessment of the reliability of roads at the stages of the implementation of their engineering design and the development of project documentation make a significant contribution. These provisions will contribute to a significant adjustment of design indicators of roads in the direction of their significant improvement.
Improvement of organization and functioning of taxi transportation through the introduction of digitalization
Authors: Bludyan N O , Ayriev R S , Moroz D G
Published: June 2020

The article provides a brief retrospective of the development of taxi activity. The key characteristics of the changes in the quality of services provided, including the average time flow, average check, etc. The carried out researches and the analysis allowed determining relevance and expediency of usage of technologies for digitalization of the taxi market to solve “classical” problems of the system how to organize transportation by taxis. The possibility of using the Unified Regional Navigation and Information System of Moscow (ERNIS) was analyzed, as well as registers of issued permits on passenger and luggage transportation by taxis in Moscow and Moscow region to solve the problems of location of taxi stands and determine the optimal taxi car. The studies and analysis made it possible to determine the relevance and appropriateness of existing taxi cabs and the future ones, taking into account the requirements for rational location, in terms of ensuring a quick approach for passengers, as well as reducing the time for car delivery. The article concludes that it is necessary to revise the approach to solve “classical” problems how to improve the functioning of the taxi market.
Estimation of Passenger Load for Urban Passenger Transport on the Route
Authors: Bogumil V N , Duque M J
Published: June 2020

This article deals with the quality of passenger service of urban passenger transport of large cities and megalopolises. The quality of passenger service is estimated mainly by the passenger load, that is the number of passengers in a vehicle. The main content of the article is a description of the method of exponential forecasting used to forecast passenger load estimation on the public transport route with high passenger traffic and low predictability of passenger flow behavior. In order to assess the possibility of using analytical methods to predict the passenger load, it is suggested to forecast the load at a critical stop of the route.
The formation of the digital transport space of Russia through the Platon’s system
Authors: Prusova V I , Zhidkova M A
Published: June 2020

The article is devoted to the issues of digitalization of the motor transport complex through the Platon’s system. This system is designed to charge owners of vehicles with a permitted mass of more than 12 tons for travelling on federal highways. The article focuses on domestic experience in organizing the collection of tolls, calculating the tariff, the positive and negative sides of the implementation of this system. Based on the analysis, the authors draw conclusions about the prospects of this system in Russia and abroad.
Development and testing of a conveyor for detecting various types of vehicles when transporting agricultural products from the field
Authors: Uspenskiy I A , Rembalovich G K , Yukhin I A , Ryabchikov D S , Stepashkina A S
Published: June 2020

Research purpose: development of a technology that will detect various types of vehicles in the image. To achieve this purpose it is necessary to solve the following objectives: Highlighting requirements for the technology being developed; Development of the technology for finding an object in an image; The choice of methods and algorithms for the allocation of objects for the development of the technology; The choice of methods and algorithms that allow detecting objects of a certain class; Implementation of the developed technology in the software system. The scientific novelty of the work lies in the application of previously known methods, which have been shown to be effective in other studies, to a new object of study, namely, to detect in images vehicles of various classes used for the transportation of agricultural goods. The practical value of the expected results lies in creating the software based on the developed technology, which makes it possible to detect vehicles of a certain class with a high degree of probability in a static image. The development of such software will automate part of the business processes and reduce labor costs. The following methods are used as the main ones in the developed technology: the HOG method (histograms of oriented gradients) and the support vector method (SVM).
Analysis of reliability and sustainability of organizational and technical systems of railway transportation process
Authors: Olentsevich V A , Belogolov Yu I , Grigoryeva N N
Published: June 2020

The increase in the throughput and processing capacity of railway stations in many cases is solved through organizational and technical measures, which makes it possible to solve this problem only partially, while limiting the possibility of increasing the volume of work in the future. Private funds should become investors in the creation of specialized points for bulk staging and preparation of station cars. Car owners and manufacturers, leasing companies, and rolling stock operators are interested in creating this type of stations. The layout of the stations specialized for the car staging should ensure the implementation of a complex of processing operations: reception, sorting, dispatch, technical inspection, all types of maintenance and repair. The article presents the dynamics of the throughput capacity of the East Siberian Railway. It analyzes the indicator un-der consideration with parallel and non-parallel schedules, which determined the main factors affecting the throughput capacity of railway stations and sections of the East-Siberian Railway and the degree of their significance. To determine the main ac-teal reasons for reducing the throughput capacity of railway stations and improving the quality of use of the indicator in question, the Ishikawa diagram was constructed. It provides a systematic approach to determining the root causes of the problem under consideration based on data on the throughput capacity of railway stations in Russia in 2013-2015. The analysis of the Ishikawa diagram identified the main factors: mismatch in the level of development of the federal railway network; errors in the management of car fleets; excess of car fleets; non-uniform arrival of car traffic volumes; decrease in the quality of car fleet management; private car fleet growth.
Maintenance and repair management taking into account specialization, cooperation and unification within a united bus company consisting of several branches
Authors: Pozhivilov N V , Maksimov V A , Krylov G A , Zavgorodniy A A
Published: June 2020

The issue of maintenance and repair management of fleet in a bus transit agency consisting of several branches is presented in the article. Technical base development takes place due to increasing of effectiveness as a result of specialization and cooperation of maintenance and repair, as well as using maximum potential, reducing and optimal costs allocation. The minimum total reduced cost was taken as a criterion for the efficiency of production placement, focusing on the costs associated with the choice of specialization and subsequent cooperation of maintenance (mainly the costs of transportation of units and vehicles between the branches). The management approach of cooperating in the issue of maintenance and repair of buses is aimed at the distribution of a particular type of work between the technical bases of different branches of the united transit agency. The applied method is based on the common approach to the solution of the “transport problem” and adapted specifically for the united transport company involving two and more separate branches. The method was tested on the united agency operating urban buses in Moscow, aiming to allocate fleet maintenance with regard to its needs and resources.
Taxi transport characteristics in Vietnam
Authors: Thai Huy Truong , Rementsov Andrey , Nguyen Khac Minh , Le AnhTuan
Published: June 2020

In recent years, economic growth and urbanization have been rapid in Vietnam, which has led to an increase in mobility in urban areas, especially in large cities. The government of Vietnam and the city authorities are trying hard to find the best solution, in which developing public transport is considered the most optimal solution to traffic urban problems. Hanoi and Ho Chi Minh City are the two special cities in Vietnam; they have applied the best policies for developing public transport and actually made a great leap forward in economy and tourism. However, the reality shows that the level of meeting the transport needs of urban people is still very low (about 14 % in Hanoi and 8 % in Ho Chi Minh). Obviously, there are objective and subjective reasons for this problem, such as: low quality of urban transport infrastructure, asynchronous development of urban transport network and the shortage of taxis and system bus. In particular, the management and monitoring of the operation of the means of public transport are very weak leading to poor quality transport services, reducing the attractiveness of the customer for the service of public transport. In this situation, the goal of increasing the efficiency of public transport to satisfy the needs of people in the large urban centers becomes a major and urgent problem. The article analyzed and evaluated the role of passenger transport in Vietnam’s economy. Important factors that will be needed to improve the quality of passenger service of Hanoi’s public transport system have been identified. The characteristics of managing and operating taxi cars of major passenger carriers are also analyzed and evaluated in this article.
Improving the performance of technical services personnel of car enterprises in digital ecosystems
Authors: Trubitsyn V A
Published: June 2020

Based on the research, the article discusses the trends in the use of digital technologies and the creation of digital ecosystems in the road transport industry. Transport informatization has created the basis for a transition to a new level of functioning in the context of digital production ecosystems, which focuses personnel’s attention on increasing labor productivity, accelerating interactions with consumers of transport and car maintenance units. However, the digital environment requires automotive personnel to improve existing and create new competencies related to digital literacy, information exchange, and increased communication skills. A digital ecosystem of the engineering and technical service of a car enterprise, a model of personnel competencies (by the example of a controller of the technical condition of vehicles) are proposed.
Analysis of failures of urban buses in the conditions of the transit agency “Mosgortrans”
Authors: Zavgorodniy A A , Maksimov V A , Pozhivilov N V , Krylov G A
Published: June 2020

The article presents the results of analysis of failures of low-floor urban buses LiAZ-529221, LiAZ-529222, LiAZ-621321 and LiAZ-621322 in the conditions of operation in Moscow. The research was based on the statistical data collected on failures of the bus modifications under consideration for the period from 01.08.2017 to 31.12.2018. As a result, the causes of failures of systems, assemblies and units, their seasonality, development of recommendations to improve the maintenance and repair system of LiAZ buses were identified. The research was carried out on the base of the branch of SUE “Mosgortrans”.
Application of digital technologies in higher education in “Materials Science” for transport complex
Authors: Chudina O V
Published: June 2020

The article is devoted to the problem of digitalization of higher technical education in transport engineering and is aimed to improve the efficiency of independent work of students and improving the classroom work of the teacher with students through the visualization of lecture materials. The article presents a new electronic educational resource (EER) on the subject “Material Science”, which is a multimedia textbook on the chapter “Theory of heat treatment” and “Practice of heat treatment” for visualization of complex hidden processes occurring in metals during heat treatment. Specific examples show how the usage of multimedia teaching methods in the educational process contributes to the visualization of invisible diffusion processes, which are accompanied by the formation of micro-and nanosized structural components. The technology of open modular systems (OMS), used to create a software environment, its advantages and wider interactive possibilities in comparison with traditional software tools are described.
Determination of Power and Kinematic Wheel Parameters when Rolling against a Drum
Authors: Balabina T A , Simonov D S , Rogov V R , Mamaev A N , Vorontsov A S
Published: June 2020

Car tire tests, including rolling resistance tests, are often performed on drum stands. Car tests on drum stands of various designs are also becoming more widespread: with a different number of drums, their locations and types of drives. However, in the literature there are no works describing the process of interaction of the wheel with the drum. In this regard, there is a need to consider the mechanics of the interaction of an elastic wheel with a drum and determine its kinematic and power characteristics, which is the task of this study. The mechanics of rolling the wheel against the drum is considered, taking into account the frictional interaction of the pair “elastic wheel – rigid drum” using the theory of preliminary displacement of the wheel elements in the zone of contact with the drum. This made it possible, inter alia, to obtain relationships for determining the rolling resistance caused by hysteresis losses in the wheel material, the tangential force acting in the contact, the moment on the wheel, the power of friction losses in the contact, the coordinates of the boundary of the adhesion and sliding sections in the contact of the wheel with the drum, relative loss of speed (slippage) of the wheel. The interaction of the wheel with two drums is also considered.
Investigation of changes in the properties of engine oil depending on the sulfur content in gasoline
Authors: Khaziev A , Laushkin A
Published: June 2020

In exploitation of modern cars, there are cases of power unit failure due to a sharp deterioration in the properties of engine oil and loss of performance of the lubricant. The article describes the causes of failures of the engines of modern cars associated with the loss of the resource of oil in the engine and the processes occurring in the lubricant. They are increase of kinematic viscosity, decrease of Total Base Number, increase of the acid number, decrease of flash point, increase of water content, decrease of additives content, increase of wear products. Decrease in properties and motor oils lifetime was caused primarily by the deviation of the physicochemical parameters of applied motor gasoline beside regulatory petrol. The process and chemical reaction of sulfurous acid formation during engine operation are described. We have established a pattern of changes in physico-chemical parameters of motor oils in automotive gasoline sulfur compounds. Made quantification is produced by the combustion of 1 kg of gasoline sulfur acid. The low values of the loss of the alkaline number of motor oil, caused by the low sulfur content of the ecological class 5 gasoline, are a prerequisite for an increase periodicity of oil change in the operation of modern cars.
Analysis of operating modes of a traction electric drive
Authors: Klimov A V , Filatov V V , Maslennikov I K , Ospanbekov B K , Belash V Ch
Published: June 2020

Nowadays the modern society thinks more about the adverse impact of transport on the environment. Therefore development engineers and manufacturers of automobile and bus facilities have recently started to take more interest in creation of transport facilities with a reduced impact on the environment. These transport facilities comprise an energy storage unit as a traction battery that has a key impact on their cost and characteristics, such as like a carrying capacity and a distance on one charge. Development engineers must get all the necessary technical specifications of system components, as well as rapidly and flexibly evaluate an impact of their changes on service characteristics. It allows applying a simulation approach by using the Matlab/Simulink software suite while analysing motion modes under service conditions. This article contains the results of such an analysis for motion modes of passenger vehicles with high capacity depending on their routes. This analysis was executed by recording speed rates with subsequent statistical processing. It shows that average running speeds don’t exceed 15 km/h. And the vehicle doesn’t reach any maximum speed values. It has been established that the electric engine working points relate to the first zone of the external characteristic. The most typical speed values do not exceed 1/3 from the maximum speed, and the values of a torsion tractive effort torque and a brake torque are within the limits and do not exceed 35 from the maximum short-time torque.
Influence of temperature and geometric parameters of elements in a turbocompressor seal assembly on its operability
Authors: Nikitin D A , Asoyan A R , Nikitin P D , Turoverov C A
Published: June 2020

Currently, most power units using internal combustion engines are equipped with turbocharging and that is explained by the requirements for efficiency, environmental safety and specific power characteristics. At the same time, the turbocompressor (TCR) is one of the resource-determining elements of power units, which accounts for a significant number of failures. Studies conducted towards the analysis of turbocompressor failures have shown that the main reason for it lies in a malfunction of the seal assembly, which is a consequence of extremely unfavorable conditions for its operation, consisting in a high (up to 800 °C) exhaust temperature, aggressive environment, a high (up to 120,000 min−1) rotor speed, the sliding speeds of the mating parts, up to 150 m/s. Oil for lubrication and cooling of the TCR is supplied through floating plain bearings, while the cavities of the turbine and compressor are isolated by means of the seal assemblies. Violation of their operability leads to the ingress of oil in a cavity of the impellers, to the imbalance of a rotor and, ultimately, to a turbocompressor failure. The determining factor affecting the operability of the seal assembly is a heat density of its parts. This factor is especially manifested in operating under forced conditions and engine shutdown, when cooling of a turbine volute is stopped by blown air, and a bearing assembly is stopped by circulating oil. In this case, a large part of the thermal energy is transferred from a heated turbine volute to the seal assembly and to the bearing assembly. The focus is on the temperature influence on performance of the turbocompressors’ sealing rings.
The regression model of automated control of timely replacement of air diesel air filter
Authors: Aslamova V S , Taiwan T , Rush E A
Published: June 2020

The article analyzes the literature sources and experience of four-year operation of the diesel locomotive of series 2TE116UM No. 016 on the Ulan-Bator railway (Mongolia). The results of the analysis show that the turbocharger does not exhaust its service life until regular preventive maintenance, due to the onset of such a phenomenon as surging, stability of its operation is disrupted. It has been established that the main causes of surge emergence are: flow stall from the diffuser walls, and/or from the guide vanes, and / or from the impeller blades and others. These deviations from the operating conditions are caused by various factors, the main among which is the contamination of the air filter. The dynamics of the onset of surging, the inspection and the replacement of the air filter are analyzed. An empirical dependence of the air flow on the degree of pressure increase in the turbocharger is obtained. In order to automate the control of the turbocharger’s unattended operation in the diesel locomotive operation mode set by the controller, the dependences of the pumping distance on the ambient temperature, the degree of pressure increase and the pressure at the inlet of the turbocharger, depending on the degree of air filter contamination, were investigated. The source data from the controller was processed in the Statgraphics Plus package and adequate regression equations were obtained to determine the running period magnitude before the surge start from each parameter individually and from the combined effect of all parameters. The coefficients of determination of the regression dependencies obtained are 92-99%.
Methods for determining transport delays at simple intersections
Authors: Bedanokov M K , Guketlev Y H , Udzhukhu A Z , Labutin A S
Published: June 2020

The article analyzes the flow of traffic to the city of Maikop. Existing methods for determining transport delays at intersections have been considered. It is established that the assessment of transport delays at intersections with a railway crossing is important from the point of view of traffic safety. The subject of the study is the intersection of Pushkin and Zheleznodorozhnaya streets in Maikop. The object of the study is the transport delay at this intersection. A new approach for transport delay calculating has been proposed. Preliminary results of the study have been presented; the author’s formula for calculating transport delays has been given. The proposed method for transport delay calculating at another intersection has been verified.
Development of an approach to the selection of the necessary method of arrangement of the left turn in the area of controlled intersection
Authors: Dorokhin S V , Novikov A N , Zhulai V A , Likhachev D V
Published: June 2020

In this article the analysis of the main ways of the organization of the left turn in a zone of the regulated intersection with use of foreign and domestic scientific sources is carried out. In the analysis the authors determined that today in the choice of the necessary way of organizing the left turn option uses a minimal set of data, namely, intensity of traffic, causing a traffic controlled junctions may not be effective. Studies of changes in the main characteristics of the traffic flow as a result of conflict analysis “left turn-direct conflicting flow” allowed the authors to develop a new approach to the selection of the necessary method of arrangement of the left turn, taking into account changes in the main characteristics of the traffic flow – delay, speed and queue length. The experiment showed the feasibility of using the proposed approach.
Results of parking survey in the central part of Moscow for new tariff determination
Authors: Pospelov P I , Martyakhin D S , Rudakova V V , Strokov D M
Published: June 2020

The need to conduct a study of the parking space in the center of Moscow was caused by a significant overload of paid parking lots and, thus, traffic jams due to car mileage in search of free parking spaces in the central part of the city, increased noise and air pollution. Excessive loading of parking lots also leads to numerous violations of parking rules. The demand for parking within the Boulevard Ring is determined by the concentration of historical monuments, government agencies, museums, exhibition halls, shops, leisure facilities and other facilities that are extremely attractive to residents and visitors of the city. The results of one of the survey stages included the following: the inventory of existing car parking within the territory in question and the indicators of the current level of the parking space system development in the territory under consideration. The inventory included the analysis of parking place location with the allocation of parking lots on the street-road network, in underground and elevated capital structures, and in courtyards. Simultaneously with the monitoring, they carried out mass surveys of drivers parking cars in paid parking lots of the road network.
Thermal contact conductance at melting and crystallization of metal micro-droplets
Authors: Minakov A , Morikawa J , Zhuravlev E , Ryu M , Schick C
Published: June 2020

To measure interfacial thermal contact conductance in fast thermal processes, ultrafast scanning calorimetry combined with high-resolution high-speed infrared thermography is applied. The dynamics of temperature distribution on the sample surface is measured by thermography during melting and crystallization of a tin particle of about 580 ng and 70 μm in diameter. The temperature difference on the sample/sensor interface is measured and used to determine the interfacial thermal contact conductance with acceptable accuracy on a millisecond time scale. It is shown that the temperature difference can be of the order of 100 K at melting and crystallization. This is very essential for applications with fast temperature changes like additive manufacturing and for calorimeter calibration. The method can be applied to different materials in fast thermal processes on a micro-scale. During crystallization, the effect of reheating (about 100 K) is observed.
Virtual corrosion testing on stainless steel AISI 304 welded pipe with Hydroxyethyl Cellulose in 3.5% NaCl solution and turbulent flow
Authors: Boonsa Parinya , Rodchanarowan Aphichart
Published: June 2020

A virtual corrosion testing machine is used to investigate the corrosion inhibition efficiency and mechanism of an inhibitor in stainless-steel 304 pipes under turbulent flow conditions. The pipes are welded by the gas tungsten arc welding method and evaluated in 3.5 percent sodium chloride solution with absence (0 ppm) and presence 100, 300, and 600 ppm hydroxyethyl cellulose concentrations. The solutions are absence and presence the inhibitor, are fed in the welded pipe at a flow rate of 7,500 and 15,000 cm3 per minute as behaves to be turbulent flows. Electrochemical impedance spectroscopy and potentiodynamic polarization techniques are used to investigate the corrosion inhibition process. The inhibitor can adsorp on the surface of stainless steel welded pipe and inhibit the corrosion rate of the stainless steel. The concentration volumes of the inhibitor are correlating the corrosion rate in the same direction. The turbulent flow is to reduce the adsorption mechanism of the inhibitor, affect to corrosion reaction for the stainless-steel welded pipe and relate to the corrosion rate. If the flow rate increases, the corrosion rate would also increase. The corrosion inhibition efficiency is reached up to 66% by addition HEC 600ppm concentration in the condition. Pitting corrosion is observed on the heat-affected zone of the welded pipe by scanning electron microscope.
Room temperature SO2 and H2 gas sensing using hydrothermally grown GO–ZnO nanorod composite films
Authors: Dhingra Vishal , Kumar Shani , Kumar Ravi , Garg Amit , Chowdhuri Arijit
Published: June 2020

Graphene based 2D materials with a surfeit of active sites and advantageously high surface to volume ratio are effectively linked to well established nanostructured semiconducting metal oxides for development of nanocomposites with enhanced gas sensing properties. Graphene Oxide (GO), a sister material of graphene, is therefore a natural choice for development of room temperature operated gas sensors. In the current investigation hydrothermally grown GO and ZnO nanorods composite (GO–ZnO–NR) is utilised for room temperature gas sensing of H2 and SO2 gases. Room temperature detection of H2 and SO2 at sub-100 ppm levels with linear variation in response for different concentrations is demonstrated. Morphological and structural analyses are conducted using Scanning electron microscopy, Raman spectroscopy and X-ray diffraction. GO-ZnO-NR composite sensor is seen to exhibit robust sensing response of 5.82 and 5.45 for 100 ppm each of H2 and SO2 gases respectively at room temperature. Further, the delayed response and recovery times exhibited by the sensor for SO2 gas are recognized to be due to formation of strongly adhering SO3 species.
Effect of deformation parameters on microstructural evolution during hot compression of Nb–V–Mo microalloyed steel
Authors: Li Ning , Kingkam Wilasinee , Han Renheng , Tang Ming , Yao Yongtao , Zhang Hexin , Zhao Chengzhi
Published: June 2020

The flow behavior of Nb–V–Mo microalloyed steel at different deformation parameters was investigated using isothermal compression tests. The microstructures of the specimens after deformation were observed through the use of a metallographic microscope. The results indicated that the deformation temperature had a significant effect on the grain size of the deformed specimen and the average size of grains increases with corresponding increase in temperature in the range of 800 °C–1100 °C. The dislocations and substructures of the specimens after deformation were characterized using TEM. The bulged grain boundary was observed through TEM when the specimen was deformed at 1100 °C and 1 s−1. The effect of the strain rate on the dynamic recrystallization behavior was investigated using electron backscatter diffraction (EBSD). The EBSD results indicated that the fraction of low-angle grain boundaries decreased with a corresponding decrease in strain rate, and the average sub-boundary misorientation increased with a decreasing strain rate. The continuous dynamic recrystallization mechanism was determined through EBSD analysis.
Single-active electron calculations of high-order harmonic generation from valence shells in atoms for quantitative comparison with TDDFT calculations
Authors: Reiff R , Joyce T , Jaroń-Becker A , Becker A
Published: June 2020

We present a reproducible ab-initio method to produce benchmark tests between time-dependent Schrödinger equation (TDSE) in the single-active-electron approximation (SAE) and time-dependent density functional theory (TDDFT) in the highly nonlinear multiphoton and tunneling regime of strong-field physics. To this end we compare results for high-order harmonic generation from valence shells in atoms using the SAE-TDSE approach and TDDFT calculations. As key to the benchmark comparison we obtain an analytic form of SAE potentials based on density functional theory, which we applied for different atoms and ions. The ionization energies of atomic ground and excited states, as well as the energies of inner shells, for the SAE potentials agree well with experimental data. Using these potentials we find remarkable agreement between the results of the two independent numerical approaches (TDDFT and SAE-TDSE) for the high-order harmonic yields in helium, demonstrating the accuracy of the SAE potentials as well as the predictive power of SAE-TDSE and TDDFT calculations for the nonperturbative and highly nonlinear strong-field process of high harmonic generation in the ultraviolet and visible wavelength regime. Finally, as another application of the SAE potentials, high harmonic spectra from outer and inner valence shells are calculated and it is shown that unphysical artifacts in the SAE-spectra from the individual shells are removed once all the amplitudes are considered.