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Articles 2341 - 2370 of 5920

Full-Text Articles in Engineering

Toward Non-Corrosion And Highly Sustainable Structural Members By Using Ultra-High-Performance Materials For Transportation Infrastructure, Shih-Ho Chao, Ashish Karmacharya Sep 2019

Toward Non-Corrosion And Highly Sustainable Structural Members By Using Ultra-High-Performance Materials For Transportation Infrastructure, Shih-Ho Chao, Ashish Karmacharya

Publications

This research focused on investigating a highly sustainable and efficient reinforced concrete structural member for future infrastructure by utilizing emerging high-performance materials. These materials include ultra-high-performance fiber-reinforced concrete (UHP-FRC) and corrosion-resistant high-strength fiber-reinforced polymer (FRP) bars. Four reduced scale UHP-FRC specimens were tested under large displacement reversals to prove the proposed new ductile-concrete strong-reinforcement (DCSR) design concept by fully utilizing these ultra-high-performance materials. Micro steel fibers were incorporated into three specimens and ultra-high molecular weight polyethylene fibers were blended into the fourth specimen. One specimen with ASTM A1035 MMFX high-strength steel rebars, one with high-strength glass fiber reinforced polymer (GFRP) …

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Evaluating How The Quality Of Pedestrian Infrastructure Affects The Choice To Walk, Gregory Rowangould, Alexis Corning-Padilla Sep 2019

Evaluating How The Quality Of Pedestrian Infrastructure Affects The Choice To Walk, Gregory Rowangould, Alexis Corning-Padilla

Publications

While the benefits of walking are well understood, the physical design of sidewalks and their maintenance needs generally receive much less attention in both research and practice than the infrastructure used by other modes of transportation. As a result, we know comparatively little about how the design of sidewalks and quality of the overall pedestrian environment affect the decision to walk. In our study we conducted a household travel survey to collect data on walking frequency and attributes related to sidewalk quality and the quality of the walking environment in Albuquerque, New Mexico. We used summary statistics and statistical modeling …

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Combining Virtual Reality And Machine Learning For Enhancing The Resiliency Of Transportation Infrastructure In Extreme Events, Supratik Mukhopadhyay, Yimin Zhu, Ravindra Gudishala Sep 2019

Combining Virtual Reality And Machine Learning For Enhancing The Resiliency Of Transportation Infrastructure In Extreme Events, Supratik Mukhopadhyay, Yimin Zhu, Ravindra Gudishala

Publications

Traffic management models that include route choice form the basis of traffic management systems. High-fidelity models that are based on rapidly evolving contextual conditions can have significant impact on smart and energy efficient transportation. Existing traffic/route choice models are generic and are calibrated on static contextual conditions. These models do not consider dynamic contextual conditions such as the location, failure of certain portions of the road network, the social network structure of population inhabiting the region, route choices made by other drivers, extreme conditions, etc. As a result, the model’s predictions are made at an aggregate level and for a …

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Integrated Full-Scale Physical Experiments And Numerical Modeling Of The Performance And Rehabilitation Of Highway Embankments, Navid Jafari, Anand Puppala, Sayantan Chakraborty, Burak Boluk Sep 2019

Integrated Full-Scale Physical Experiments And Numerical Modeling Of The Performance And Rehabilitation Of Highway Embankments, Navid Jafari, Anand Puppala, Sayantan Chakraborty, Burak Boluk

Publications

The study aimed to fundamentally understand how soil strength and hydraulic properties are impacted by recurring cycles of wetting and drying induced by climate variability, with the practical implication of forecasting the stability of highway embankment slopes. The review of literature on the effects of long-term cyclic wetting-drying phases on hydro-mechanical properties of clayey soils suggests that only a few cycles of wetting and drying can impact the strength and hydraulic conductivity, where the latter can increase several orders of magnitude. Laboratory model-scale experiments of Louisiana and Texas soils are still ongoing and will relate the laboratory test results to …

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Development Of Geopolymer-Based Cement And Soil Stabilizers For Transportation Infrastructure, Miladin Radovic, Anand Puppala Sep 2019

Development Of Geopolymer-Based Cement And Soil Stabilizers For Transportation Infrastructure, Miladin Radovic, Anand Puppala

Publications

Geopolymer Cement (GPC) has drawn much attention in the recent years as an alternative to Ordinary Portland Cement (OPC) for soil stabilization, pavements, bridges and other transportation structures due to their good mechanical properties in comparison to OPC. In addition, GPC can be processed at room temperatures from aqueous solutions of waste materials (e.g. fly ash) or abundant natural sources (e.g. clay), thereby significantly reducing CO2 production associated with processing of OPC. As such, GPC proves to be a more sustainable and environmentally friendly alternative than OPC. This research explores methods to develop GPC with desired properties and evaluate their …

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How Effective Are Toll Roads In Improving Operational Performance?, Sonu Mathew, Srinivas S. Pulugurtha Sep 2019

How Effective Are Toll Roads In Improving Operational Performance?, Sonu Mathew, Srinivas S. Pulugurtha

Mineta Transportation Institute

The main focus of this research is to develop a systematic analytical framework and evaluate the effect of a toll road on region’s traffic using travel time and travel time reliability measures. The travel time data for the Triangle Expressway in Raleigh, North Carolina, United States was employed for the assessment process. The spatial and temporal variations in the travel time distributions on the toll road, parallel alternate route, and near-vicinity cross-streets were analyzed using various travel time reliability measures. The results indicate that the Triangle Expressway showed a positive trend in reliability over the years of its operation. The …

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Research On Optimization Of The Ship Routeing System In Qiongzhou Strait, Qifu Wang Aug 2019

Research On Optimization Of The Ship Routeing System In Qiongzhou Strait, Qifu Wang

Maritime Safety & Environment Management Dissertations (Dalian)

No abstract provided.

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Study On The Reduction Of Carbon Emission，Results From The Vehicles In The Shanghai Port’S Container Collection And Distribution System, Chaofeng Chen Aug 2019

Study On The Reduction Of Carbon Emission，Results From The Vehicles In The Shanghai Port’S Container Collection And Distribution System, Chaofeng Chen

World Maritime University Dissertations

No abstract provided.

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Stability Of Slopes Of Embankments Of Railway Access Road To Jsc "Shargunkumir", U.E. Ergashev, N.I. Begmatov, F.F. Eshonov Aug 2019

Stability Of Slopes Of Embankments Of Railway Access Road To Jsc "Shargunkumir", U.E. Ergashev, N.I. Begmatov, F.F. Eshonov

Journal of Tashkent Institute of Railway Engineers

The article deals with the stability of the embankment slope. The scheme for the calculation and the results of the calculation of the stability of the embankment slope are presented. Based on the calculation results, transverse embankment profiles with a height of more than 12 m are designed and recommended for use

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Technology Of Strengthening Of Embankment Of Railways Of Sandy Soils With Application Of Geosynthetic Materials, K.S. Lesov Aug 2019

Technology Of Strengthening Of Embankment Of Railways Of Sandy Soils With Application Of Geosynthetic Materials, K.S. Lesov

Journal of Tashkent Institute of Railway Engineers

This article reduced the technology of strengthening the embankment of the railway roadbed from sandy soils with the use of geosynthetic materials. Constructive and technological solutions execution of work are given

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Some Aspects Of Evaluating Economic Efficiency During Thermal Renewal Of External Walls Of Civil Buildings, S.S. Shaumarov, S.I. Kandakhorov Aug 2019

Some Aspects Of Evaluating Economic Efficiency During Thermal Renewal Of External Walls Of Civil Buildings, S.S. Shaumarov, S.I. Kandakhorov

Journal of Tashkent Institute of Railway Engineers

This article presents the results of calculations to determine the payback period for the installation of additional insulation of the outer walls of civil buildings, taking into account the increase in tariffs for thermal energy. From a practical point of view, this calculation allows us to evaluate the economic efficiency of the thermal renewal of the outer walls of civil buildings

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To The Question Of Producing Efficient Construction Materials Based On Waste Of Agricultural Crops, Anvar Ishanovich Adilkhodjayev, I.M. Mahamataliev, A.T. Ilyasov Aug 2019

To The Question Of Producing Efficient Construction Materials Based On Waste Of Agricultural Crops, Anvar Ishanovich Adilkhodjayev, I.M. Mahamataliev, A.T. Ilyasov

Journal of Tashkent Institute of Railway Engineers

One of the promising areas of agricultural waste use is its use as raw material for the pro-duction of efficient building materials for energy-saving technologies, which is especially im-portant for areas that have a waste of agriculture and are in short supply in easily accessible building materials. On the other hand, an important task of technical policy is now to increase the use of lightweight structures in order to reduce the mass of erected structures, reduce the cost of transport costs and the cost of installing structures. In this regard, the use of dry cotton stems (guzapai) in a specially …

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Method Of Activation Of Cement Mixture Components By Ultrasonic Field, U.A. Yokubov, O.V. Trunilina, V.N. Avdievich, S.Z. Mirzaev, S.E. Kurbanbaev Aug 2019

Method Of Activation Of Cement Mixture Components By Ultrasonic Field, U.A. Yokubov, O.V. Trunilina, V.N. Avdievich, S.Z. Mirzaev, S.E. Kurbanbaev

Journal of Tashkent Institute of Railway Engineers

The theoretical and experimental methods of increasing the efficiency of cement disperse systems by the action of a low-energy ultrasonic field are given in the article, as well as a technique providing highly efficient treatment of mixing water with a minimum energy expenditure

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Mathematical Models Of Magnetic Chains Of Electron Electromagnetic Modifiers With Fluid Meter Measuring Fluid Surface, S.F. Amirov, A.O. Ataullaev, S.H. Jumabaev Aug 2019

Mathematical Models Of Magnetic Chains Of Electron Electromagnetic Modifiers With Fluid Meter Measuring Fluid Surface, S.F. Amirov, A.O. Ataullaev, S.H. Jumabaev

Journal of Tashkent Institute of Railway Engineers

Mathematical models of magnetic circuits of electromagnetic flow transducers with an annular channel have been developed, taking into account the distribution of the parameters of the magnetic circuit and leakage fluxes closed through non-working air gaps. The possibility of compensating for the difference in magnetic resistance of coaxially arranged concentric ferromagnetic cores due to the difference in their circumference by selecting the thickness of the cores is shown.

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Technique For Determining The Capacity Of A Container Terminal Equipped By Rubber Tyred Gantry, Sh.R. Abduvahitov Aug 2019

Technique For Determining The Capacity Of A Container Terminal Equipped By Rubber Tyred Gantry, Sh.R. Abduvahitov

Journal of Tashkent Institute of Railway Engineers

This article presents the advantages and disadvantages, as well as the technical characteristics of the rubber tyred gantry. He conducted a brief scientific analysis in the field of research of technical equipment of container terminals. A mathematical model of the parameters of relations of the crane, container and cargo terminal is proposed.

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The Study Of Magnetic Circuits With Distributed Magnetizing Windings, S.F. Amirov, K.K. Jurayeva, O.T. Boltayev Aug 2019

The Study Of Magnetic Circuits With Distributed Magnetizing Windings, S.F. Amirov, K.K. Jurayeva, O.T. Boltayev

Journal of Tashkent Institute of Railway Engineers

By research of magnetic chains of new magnetoelastic sensors of efforts with the distributed magnetizing windings by method of drawing up the equivalent circuit it is shown that at rather large number of the cascade connected sites of a magnetic chain and accounting of distribution of the magnetizing forces of sections of a winding of excitement decrease in an error of calculation of magnetic chains with the distributed parameters is reached essential (to 23%). It is established that magnetic tension along a magnetic chain is distributed not linearly and changes the sign in a point of a magnetic neutral, and …

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Rationing Of Departure Time Of Freight Cars From Stations And Optimization Of Delivery Periods, J.R. Qobulov, J.S. Barotov Aug 2019

Rationing Of Departure Time Of Freight Cars From Stations And Optimization Of Delivery Periods, J.R. Qobulov, J.S. Barotov

Journal of Tashkent Institute of Railway Engineers

In this article to connect the wagons loaded to the trains shortening the staying time in process of their collection and recycling delivers freight wagons accelerates the selection and use of shunting equipment, sends wagons to the station at the right time. Is listed below in railway transport on delivery freight wagons, international and local wagons staying time the main quality indicators in station. As well as developed scheme of the algorithm for the timing of staying in the wagons at the station.

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Developing Of Microelectronic Block Нсс, A.R. Аzizov, E.K. Аmetova Aug 2019

Developing Of Microelectronic Block Нсс, A.R. Аzizov, E.K. Аmetova

Journal of Tashkent Institute of Railway Engineers

The issue of developing a microelectronic control block of paired arrows the HCC is discussed in the article. The analysis of the block circuit concept is carried out and it is determined which elements are to be replaced and on which microelectronic devices. Electric circuits are considered that provide automatic recruitment of a train route that contains four circuits. The analysis of the block operation in the circuit of push-button relays, which receive power from the block НСС, was carried out, the calculation of the assumed current strength showed the need to use an optical-relay type Pvg-612 in this circuit.

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Solving The Problem Of Capacity Of Single-Track Railway Section T-A Located Along The Line Of The Transport Corridor “China-Kyrgyzstan-Uzbekistan”, S.K. Hudajberganov, G.Sh. Ikramov, Sh.Sh. Kajumov Aug 2019

Solving The Problem Of Capacity Of Single-Track Railway Section T-A Located Along The Line Of The Transport Corridor “China-Kyrgyzstan-Uzbekistan”, S.K. Hudajberganov, G.Sh. Ikramov, Sh.Sh. Kajumov

Journal of Tashkent Institute of Railway Engineers

The main problem of single track railway lines is that the existing capacity does not satisfy the need, resulting in the need to apply a number of measures. This is exactly the problem that exists in the considered junction T-A, which in the future will be a link in the “China-Kyrgyzstan-Uzbekistan” transport corridor. The article provides possible solutions to this problem. The adoption of the optimal solution in the future will solve not only the problem of through put, but also help to improve the qualitative and quantitative indicators of this site.

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Development Of Classification Of The Reasons Of Losses In The Work Sorting Stations, Sh.M. Suyunbayev, D.B. Butunov Aug 2019

Development Of Classification Of The Reasons Of Losses In The Work Sorting Stations, Sh.M. Suyunbayev, D.B. Butunov

Journal of Tashkent Institute of Railway Engineers

In this article to connect the wagons loaded to the trains shortening the staying time in process of their collection and recycling delivers freight wagons accelerates the selection and use of shunting equipment, sends wagons to the station at the right time. Is listed below in railway transport on delivery freight wagons, international and local wagons staying time the main quality indicators in station. As well as developed scheme of the algorithm for the timing of staying in the wagons at the station.

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Analysis Of Video Monitoring Of Results Of Labor Activities Of Train Dispatcher (As A Traffic Dispatcher Of The Single Dispatch Center Of The Joint-Stock Company "Uzbekistan Temir Yollari".), S. Sulaymanov, Kh.M. Kamilov Aug 2019

Analysis Of Video Monitoring Of Results Of Labor Activities Of Train Dispatcher (As A Traffic Dispatcher Of The Single Dispatch Center Of The Joint-Stock Company "Uzbekistan Temir Yollari".), S. Sulaymanov, Kh.M. Kamilov

Journal of Tashkent Institute of Railway Engineers

The article presents the results of processing and analysis of video data of the timing of the work shift of train dispatchers of the Single Dispatch Center of JSC "Uzbekistan Temir Yollari". A diagram of the distribution of work shift time in three characteristic poses is constructed. Train dispatchers 57% of the shift time when doing work are in a sitting pose, 21% in a sitting-standing pose, 9% are in a standing pose and 13% for other work on demand. Based on the results of the video timing, taking into account the anthropometric parameters of a person, the dimensions of …

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About Organization Of Mobile Communications In Long Car Tunnels, A.S. Shamsiev, A.Sh. Shakhobiddinov Aug 2019

About Organization Of Mobile Communications In Long Car Tunnels, A.S. Shamsiev, A.Sh. Shakhobiddinov

Journal of Tashkent Institute of Railway Engineers

The high demand for mobile services observed in recent years poses a challenge for telecom operators to expand service areas not only in populated areas, but also in places with a specific architecture and terrain. These places include car tunnels. In this article, the authors discuss some issues of mobile communications in long car tunnels. The requirements for the characteristics of a mobile communication channel and some expressions for calculating signal levels inside rectangular tunnels are considered.

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Analysis Of Methods For Determining The Resistance Of Differential Scattering Of Synchronous Machines, Taking Into Account The Saturation Of The Magnetic Circuit, А.K. Halbutaeva Aug 2019

Analysis Of Methods For Determining The Resistance Of Differential Scattering Of Synchronous Machines, Taking Into Account The Saturation Of The Magnetic Circuit, А.K. Halbutaeva

Journal of Tashkent Institute of Railway Engineers

The article presents the results of the analysis of published scientific papers, in which one or another method of calculating the resistance of differential scattering of synchronous machines, taking into account the non-linearity of saturation of the magnetic core, is adopted. It is noted that most of these works are performed using the superposition method, intended only for linear systems.

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Analysis Of Characteristics Of Parabolic And Parabolocylindrical Hubs, Comparison Of Data Obtained On Them, J.R. Kodirov, S.Sh. Khakimova, Sh.M. Mirzaev Aug 2019

Analysis Of Characteristics Of Parabolic And Parabolocylindrical Hubs, Comparison Of Data Obtained On Them, J.R. Kodirov, S.Sh. Khakimova, Sh.M. Mirzaev

Journal of Tashkent Institute of Railway Engineers

Solar energy technologies can be quickly deployed and have the potential for a global transfer of technology and innovation. In order to manufacture parabolic and parabolic cylindrical concentrators, an analytical review of these two types of solar devices was carried out and, after their creation, experiments were conducted on them in the season of maximum solar radiation. The article also presents data and their comparison for planning subsequent actions of research activities.

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Features Of Functioning Container Terminal In Supply Chains, D.I. Ilesaliev, Sh.R. Abduvahitov Aug 2019

Features Of Functioning Container Terminal In Supply Chains, D.I. Ilesaliev, Sh.R. Abduvahitov

Journal of Tashkent Institute of Railway Engineers

The purpose of this article is to study the container terminal as a technical system. In this regard, in this article it is necessary to investigate the functioning of the container terminal, associated with the random nature of the incoming and outgoing containers from the terminal. An example of a method for determining the number of reach players is also given.

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Analysis Of Work Of Passenger Trains On Two-Zone Sections And Automation Of Alerts Issued To Them, H.S. Toxirov, A.M. Bashirova Aug 2019

Analysis Of Work Of Passenger Trains On Two-Zone Sections And Automation Of Alerts Issued To Them, H.S. Toxirov, A.M. Bashirova

Journal of Tashkent Institute of Railway Engineers

“Uzbekistontimir yollari” JSC makes a great contribution to ensuring the safety of passenger transportation. Passenger traffic is constantly growing and growth is expected in the future, and competition is growing in the suburban passenger transport market. Increasing the size of passenger trains requires even more attention to safety. The article discusses the possibility of organizing a zonal movement on a suburban section X-T and to facilitate the work of the duty officers at the automation station issuing warnings for trains.

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Principles And Features Of Blockchain Technology Implementation In The Railway Industry, L.F. Kazanskaya, N.A. Drivolskaya Aug 2019

Principles And Features Of Blockchain Technology Implementation In The Railway Industry, L.F. Kazanskaya, N.A. Drivolskaya

Journal of Tashkent Institute of Railway Engineers

Objective: to Consider the advantages and disadvantages of using blockchain technology and the possibility of introducing cryptocurrencies in the transport sphere of Russia. Methods: methods of generalization, grouping, comparative analysis, system approach, problem statement, study of literary sources and normative-legislative documents, results of activity, study and generalization of experience were Used. Results: blockchain technology applied to cryptocurrencies is Considered. The principle of operation of the blockchain technology in the transaction of bitcoins between users in relation to the railway industry. The conclusion is made about the problems of introduction of cryptocurrencies as payment instruments in the near future due to …

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Peculiarities Of Corporate Governance On Railway Transport Of The Republic Of Uzbekistan, M.G. Grigoryan, F.Z. Karakulov Aug 2019

Peculiarities Of Corporate Governance On Railway Transport Of The Republic Of Uzbekistan, M.G. Grigoryan, F.Z. Karakulov

Journal of Tashkent Institute of Railway Engineers

Peculiarities and problems of the development of corporate governance of the railway company of «Uzbekistan Temir Yo’llari» JSC in the current economic conditions are considered. The relevance of the chosen direction of research is determined by its high significance for the economic, political and geopolitical development of the railway transport of the Republic of Uzbekistan. Political and geopolitical interest is associated with a significant impact on the national economy, which is provided by the railway transport companies of the Republic of Uzbekistan, as well as with the desire for the interaction of other enterprises in order to obtain additional competitive …

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Optimizing The Valorization Of Industrial By-Products For The Induction Healing Of Asphalt Mixtures, Amir Tabakovic, Marta Vila-Cortavitarte, Daniel Jato-Espino, Daniel Castro-Fresno Aug 2019

Optimizing The Valorization Of Industrial By-Products For The Induction Healing Of Asphalt Mixtures, Amir Tabakovic, Marta Vila-Cortavitarte, Daniel Jato-Espino, Daniel Castro-Fresno

Articles

Self-healing within asphalt pavements is the process whereby road cracks can be repaired automatically when thermal and mechanical conditions are met. To accelerate and improve this healing process, metal particles are added to asphalt mixtures. However, thisapproach is costly both in economic and environmental terms due to the use of virgin metallic particles. So, even though the self-healing of asphalt mixtures has been widely addressed in experimental terms over the years, there is a lack of research aimed at modelling this phenomenon, especially with the purpose of optimizing the use of metal particles through the valorization of industrial by-products. As …

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Toward Car Free Key West, Mary Bishop Aug 2019

Toward Car Free Key West, Mary Bishop

Journal of Transportation Demand Management Research

This paper explores the transportation problems created by the large volume of tourist arrivals to the island of Key West, Florida. A survey of visitors to the island was conducted to uncover their perspectives related to the barriers and benefits of various transportation modes in hopes to inform City staff on the development of transportation options that will meet the needs and desires of tourists. The results from 398 respondents revealed a variety of trends, including varying travel choices depending on the number of visits, where visitors were from, and arrival types. From these trends, priority groups for behavior change …

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