You limited your search to:

  Partner: UNT Libraries Government Documents Department
 Serial/Series Title: Research report (Southwest Region University Transportation Center (U.S.))
Designing Fine Aggregate Mixtures to evaluate fatigue crack growth in asphalt mixtures

Designing Fine Aggregate Mixtures to evaluate fatigue crack growth in asphalt mixtures

Date: April 2001
Creator: Bhasin, Amit; Motamed, Arash & Izadi, Anoosha
Description: "Fatigue cracking is a significant form of pavement distress in flexible pavements. The properties of the sand-asphalt mortars or fine aggregate matrix (FAM) can be used to characterize the evolution of fatigue crack growth and self-healing in asphalt mixtures. This study compares the internal microstructure of the mortar within a full asphalt mixture to the internal microstructure of the FAM specimen. This study also conducts a limited evaluation of the influence of mixture properties and methods of compaction on the engineering properties of the FAM specimens. The results from this study, although limited in number, indicate that in most cases the SGC compacted FAM specimen had a microstructure that most closely resembled the microstructure of the mortar within a full asphalt mixture. Another finding from this study was that, at a given level of damage, the healing characteristic of the three different types of FAM mixes was not significantly different. This indicates that the healing rate is mostly dictated by the type of binder and not significantly influenced by the gradation or binder content, as long as the volumetric distribution of the mastic was the same. In other words, the inherent healing characteristics of the asphalt binder play a more ...
Contributing Partner: UNT Libraries Government Documents Department
Bush School capstone course support: the regional impact of climate change on transportation infrastructure and decision making

Bush School capstone course support: the regional impact of climate change on transportation infrastructure and decision making

Date: September 2009
Creator: Lindquist, Eric
Description: "The Master of Public Service and Administration program at Texas A&M's Bush School of Government and Public Service requires that all second year graduate students participate in a two semester Capstone course."
Contributing Partner: UNT Libraries Government Documents Department
Portable Emission Measurement System-based approach to developing and evaluating driving cycles for air quality assessment

Portable Emission Measurement System-based approach to developing and evaluating driving cycles for air quality assessment

Date: April 2010
Creator: Wang, Ziqianli
Description: "The first objective is to develop driving cycles for classified roads incorporating both a vehicle's driving activities and its emission characteristics, using the data collected by Portable Emission Measurement System (PEMS), which was neither available nor has ever been used in developing driving cycles. A comprehensive database is established for the collected data and a sophisticated computer program is developed to generate the specific driving cycles. The second objective is to develop an evaluation approach of driving cycles in which Vehicle Specific Power (VSP), a parameter that can readily connect the driving modes with emissions, is used to evaluate how well the driving cycles can represent the driving and emission characteristics on real roads."
Contributing Partner: UNT Libraries Government Documents Department
Impacts of pending federal greenhouse gas legislation on the Texas transportation sector

Impacts of pending federal greenhouse gas legislation on the Texas transportation sector

Date: May 2010
Creator: Woodward, James T. & Boske, Leigh B.
Description: "This 2010 study, funded by the Southwest Region University Transportation Center, assesses current regulatory attempts to mitigate climate change and how such proposed action would impact the Texas transportation sector economically. Social and political trends suggest the United States may soon join other United Nations Framework Convention on Climate Change (UNFCCC) countries in drafting substantive, national climate change policy. After providing a brief overview of past and present climate efforts taken both nationally and internationally, this paper explores different economic solutions to address the externalities of fossil fuel emissions. Alternatives include command-and-control regulation, a carbon tax, and a cap-and-trade program. Several factors, including the difficulty of quantifying and constraining greenhouse gas emissions downstream at the vehicle tailpipe, suggest a carbon tax levied upon upstream refiners is the most promising market-based alternative to reduce carbon emissions within the United States's transportation sector. Texas business leaders and lawmakers have repeatedly voiced their disapproval of mandatory national carbon controls over the past decade. A crucial factor why much of the Lone Star State's populace remains opposed to climate change action is Texas leads the nation's energy industry, which is decidedly fossil-fuel based and therefore carbon intensive. Prevailing thought is a carbon tax would ...
Contributing Partner: UNT Libraries Government Documents Department
Thinking critically about models used to predict emergency evacuation in Gulf Coast states

Thinking critically about models used to predict emergency evacuation in Gulf Coast states

Date: July 2010
Creator: Moseley, Brandon; Wynn, Garlin & Lewis, Carol Abel
Description: "This work examines the application of these models in Gulf Coast states and discusses future direction for improving their use by government officials."
Contributing Partner: UNT Libraries Government Documents Department
A comprehensive examination of heavy vehicle emissions factors

A comprehensive examination of heavy vehicle emissions factors

Date: August 2010
Creator: Thompson, Melissa Renee; Unnikrishnan, Avinash; Conway, Alison J. & Walton, C. Michael
Description: "This report summarized the findings from reviewing the literature on several topics that are related to heavy vehicle emissions including engine and fuel types, vehicle technologies that can be used to reduce or mitigate vehicle emission, the factors that affect vehicle emission, vehicle emissions modeling, and current and future policy requiring accurate accounting of heavy vehicle emission."
Contributing Partner: UNT Libraries Government Documents Department
Examining the influence of tolls on commute departure and route choice behavior in the Chicago region

Examining the influence of tolls on commute departure and route choice behavior in the Chicago region

Date: August 2010
Creator: Paleti, Rajesh; Bhat, Chandra R. & Eluru, Naveen
Description: "The current study contributes toward understanding the influence of congestion pricing on commuter behavior by specifically examining what dimensions of commute travel behavior are affected as a response to congestion pricing."
Contributing Partner: UNT Libraries Government Documents Department
Network methods for project selection based on optimizing environmental impact

Network methods for project selection based on optimizing environmental impact

Date: August 2010
Creator: Duthie, Jennifer Clare
Description: "Traditionally, transportation road networks have been designed for minimal congestion. Unfortunately, such approaches do not guarantee minimal vehicle emissions. Given the negative impacts of vehicle pollutants as well as tighter national air quality standards, it is critical for regions to be able to identify capacity modifications to road networks such that vehicle emission are minimal. This ability combined with land use changes and opportunities for non-auto travel are paramount in helping regions improve air quality."
Contributing Partner: UNT Libraries Government Documents Department
Performance analysis of the "zoning" strategies for Americans with Disabilities Act paratransit services

Performance analysis of the "zoning" strategies for Americans with Disabilities Act paratransit services

Date: August 2010
Creator: Shen, Chung-Wei & Quadrifoglio, Luca
Description: "The objective of this research is to provide a more in-depth evaluation and comparison between centralized and decentralized zoning strategies for the city of Houston, Texas, by developing a simulation model to evaluate the effect of zoning strategies on the productivity and service quality for the ADA paratransit service."
Contributing Partner: UNT Libraries Government Documents Department
Predicting the incremental effects on transit ridership due to Bus-On-Shoulder operations

Predicting the incremental effects on transit ridership due to Bus-On-Shoulder operations

Date: August 2010
Creator: Machemehl, Randy B. & Pappas, Elani
Description: "Bus-On-Shoulder (BOS) operations are an extremely effective method for increasing the quality of a bus service; allowing for a bus to use a freeway shoulder as a bypass lane not only decreases bus travel time but also increases the bus service's overall performance. BOS has also been found to increase bus ridership. The modern BOS system began in the Minneapolis-Saint Paul area almost 20 years ago. Using the extensive data available from Minneapolis-Saint Paul, ridership changes due to BOS operations were explored. The data showed that with 90% confidence, ridership will increase by at least 4.5% and as much as 14.3%. This paper also explores how the citizens of Austin, Texas would respond to a BOS operation on local freeways. A stated preference survey was administered to a sample of Austin commuters. It was determined that potential riders would desire a time savings of 7 or more minutes. Typically it is challenging for persons to accurately predict time savings, therefore it was concluded that for a BOS operation to be successful it was necessary for a there to be a perceived time savings."
Contributing Partner: UNT Libraries Government Documents Department
FIRST PREV 1 2 3 4 5 NEXT LAST