Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 243 for “"Travel Times"”.
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Tomographic inversion of Pn travel times in western China
… inversion based on a large collection of Pn travel time data from various sources. Our tomography image reveals four significant features corresponding to the surface geology: (1) Four major basins bordering the Tibetan Plateau (TP) and/or Tien Shan (Tarim, Junggar, Qaidam, and Sichuan basin) …
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Inter-annual variability of acoustic ray travel times in the northeast Pacific
… to July 1989. In this thesis, the acoustic ray travel times are analyzed in order to investigate inter-annual basin-scale thermal variability. These thermal fluctuations may help detect any greenhouse warming and greater understanding of them will increase knowledge of ocean-atmosphere …
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A Macroscopic Validation of the Evacuation Simulation Prediction Tool on Highway Travel Times
… Simulation Prediction (ESP) tool in predicting travel time during high volume traffic periods. The discrete event-based simulation tool was designed to aid local evacuation planning contingencies. Research of the Florida Department of Transportation traffic count data demonstrated parallel …
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A Discrete Optimization Approach to Solve a Reader Location Problem for Estimating Travel Times
… remains of contemporary interest is the study of travel times. Travel time information technologies, until very recently, have not been efficient enough to provide instantaneous information for managing traffic flow. The Virginia Department of Transportation (VDOT) currently operates a number of …
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Implementation and evaluation of an asymmetric equilibrium route choice model incorporating intersection-related travel times
… encountered in practice. Also, a methodology for travel time analysis of urban and suburban arterials is applied to links between intersections in place of conventional link performance functions.
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Wadati-Benioff zone structure of the Aleutian Arc as defined by teleseismically recorded seismic travel-times
Includes bibliographical references (pages 99-103).
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Investigating the ability of automated license plate recognition camera systems to measure travel times in work zones
… with regards to its ability to produce real-time travel time information in active work zones. A literature review was conducted to investigate the ALPR technology as well as to identify other research that has been conducted using ALPR systems to collect travel time information. Next, the ALPR …
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The (travel) times they are a changing : a computational framework for the diagnosis of non-alcoholic fatty liver disease (NAFLD)
We propose and validate a non-invasive method to diagnose Non-Alcoholic Fatty Liver Disease (NAFLD). The proposed method is based on two fundamental concepts: 1) the speed of sound in a fatty liver is lower than that in a healthy liver and 2) the quality of an ultrasound image is maximized when the …
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A study of the groundwater travel time distribution at a rural watershed in Iowa: A systems theory approach to groundwater flow analysis
… water interaction in terms of the travel time distribution framework applied to a tile-drained, agricultural landscape at the watershed scale. Specifically, we examined the two dimensional, steady state groundwater flow characterizing a shallow, unconfined aquifer at a …
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Application of robust and inverse optimization in transportation
… two problems in transportation: finding the travel times and designing a transportation network. We assume that users choose the route selfishly and the flow will eventually reach an equilibrium state (User Equilibrium). The first part of the thesis demonstrates how inverse and robust …
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Predicting Ridership and Travel Time Impacts of Bus Service Changes Using Sketch Planning Methods
… and understanding their impacts on ridership and travel times can inform decision-making as changes are considered for the bus network. Budgetary limitations are at the heart of service change decisions, resulting in the need for analysts to assess different scenarios and accommodate quick …
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Urban Spatial Structure and Household Travel Time
… of the cited harms of sprawl is the alleged travel time burden that it imposes on its residents. Previous research has tested the relationship between the sprawl of business activity and travel times by examining only its effects on commuting times and has concluded that people do not …
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Optimal adaptive routing and traffic assignment in stochastic time-dependent networks
… (STD) network is defined by treating all link travel times at all time periods as random variables, with possible time-wise and link-wise stochastic dependency. A routing policy is a decision rule which specifies what node to take next out of the current node based on the current time and …
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Evaluation of Travel Time Estimates Derived From Automatic Vehicle Identification Tags in San Antonio, TX
… the reliability and accuracy of the AVI system, travel tag level of market penetration (LMP) trends, and a comparison of aggregated travel time values with probe vehicle travel time values. This thesis serves as a first step toward the modeling of AVI systems in which the effects of travel tag …
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Hydrogeology and groundwater geochemistry of two glacigenic aquitard/aquifer systems in north-central and south-central Minnesota
… aquitards can corroborate estimated vertical travel times.</p> <p>In Phase II (2017-2019) of the study, a rotary-sonic rig was used to install 12 small-diameter piezometers in nests at the town of Olivia, MN (depths from 13 to 210 ft) and at the MN Hydrogeology Field Camp (HFC; depths from 115 …
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A System-wide Planning Tool to Evaluate Access from Crash Sites to Medical Facilities in Virginia
… in the Commonwealth of Virginia. Calculated travel times from fatal crash sites to medical facilities are compared with reported travel times to better estimate travel time modification factors. The modified travel times are used to determine coverage areas and evaluate serious injury crash …
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Travel Time Estimation on Arterial Streets
Estimation of real-time travel times on arterial streets has been a challenging task due to the intersection control delay as well as bottleneck delay from the downstream link. Therefore, few transportation professionals have conducted research at utilizing the dynamic flow methods to estimate …
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Groundwater Modeling and Hydrogeological Parameter Estimation: Potomac Aquifer System, SWIFT Research Center
… the Theis-based calculations do not consider. Travel times from the monitoring wells to TW-1 were calculated with the single and multi-layered models pumping 700 GPM from TW-1. Travel times from the SWIFT MW within the UPA sublayers ranged from 204 to 597 days depending on the sublayer, while …
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Determining Transportation and Development Impacts of Consolidated Schools in West Virginia
… obtained from each facility for both the bus travel time and transportation mode choice for typical daily school travel. These data were then compared to state travel guidelines and national averages regarding mode choice. Aerial photography was also obtained for the area around each of the …
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