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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Investigation of 50 km/h speed zone :

Nalluri, Gopi Krishna Unknown Date (has links)
To date, the 50 km/h General Urban Speed Limit (GUSL) has been implemented to some local residential streets in the City of Port Adelaide Enfield (hereafter referred to as Port Adelaide), South Australia as a Local Area Traffic Management (LATM) scheme since March 2003 aiming to reduce travel speeds and traffic volumes so as to enhance road safety and amenity of residential areas. Port Adelaide is located approximately nine kilometres away from the North-west of Adelaide Central Business District (CBD). There are major express highways and freight roads enclosing Port Adelaide, and within the boundaries is composed of many arterial and collector roads. All of these arterial roads and some major collector roads line in north-south direction. As a result of these geographical characteristics, Port Adelaide is a city covering the major direct routes for residents and major freight route for goods transport in the north-west suburbs. / However, one of the problems occurring in Port Adelaide seems to be characteristics of grid road networks lacking clear road hierarchy, which can be seen from many local streets connecting directly with nearby arterial and/or collector roads. Furthermore, as described previously Port Adelaide consists of many freight routes, arterial routes, and these characteristics cause another problem. Traffic is induced to divert to local streets, which are relatively straight, and uses them as an alternative route causing many problems to residents in the local area due to travel demands during rush hour. To this point, it can be seen that the 50 km/h GUSL scheme might not be as efficient as it should be in deterring through traffic since the implementation of traffic management has not covered a macro scale, which in this case is arterial roads forming a connective grid. / This study seeks to present the analysis of traffic data in terms of traffic volumes, mean speed and 85th percentile on three different local residential streets during weekday and soma crash data analysis is also done on two study streets. The expected results of this study may be taken as samples for further research in future. / Thesis (MTransportSysEngineering)--University of South Australia, 2006.
2

Evaluating the effectiveness of speed limit signs on The Norton Summit Road /

Khotpankool, Nat. Unknown Date (has links)
Thesis (MEng(TransportSystemsEng))--University of South Australia, 2004.
3

Evaluation of 50 km/hr general urban speed limit : case study of Unley of South Australia /

Bollavaram, Praveen Kumar Unknown Date (has links)
Thesis (MEng(TransportSystemsEng))--University of South Australia, 2004.
4

Evaluation of 50 km/hr general urban speed limit : case study of Unley of South Australia /

Bollavaram, Praveen Kumar Unknown Date (has links)
Thesis (MEng(TransportSystemsEng))--University of South Australia, 2004.
5

Effect of horizontal alignment on driver speed behaviour on different road classifications /

Nie, Bin. January 1900 (has links)
Thesis (M.App.Sc.) - Carleton University, 2006. / Includes bibliographical references (p. 144-152). Also available in electronic format on the Internet.
6

Operating speed models for low speed urban environments based on in-vehicle GPS

Wang, Jun. January 2006 (has links)
Thesis (Ph. D.)--Civil and Environmental Engineering, Georgia Institute of Technology, 2006. / Dr. William Bachman, Committee Member ; Dr. Peter P. Parsonson, Committee Member ; Dr. Kwok-Leung Tsui, Committee Member ; Dr. John D. Leonard II, Committee Member ; Dr. Karen Dixon, Committee Chair.
7

Operating speed models for low speed urban environments based on in-vehicle GPS

Wang, Jun. January 2006 (has links)
Thesis (Ph. D.)--Georgia Institute of Technology, 2006. / Includes bibliographical references (p. 177-183). Also available online via the Georgia Tech ETD Database website (http://etd.gatech.edu/).
8

Fatal Crashes Caused By Light Trucks Relative To Cars: A Test Of The Offsetting Behavior Hypothesis

Zubritsky, Adam David 01 January 2005 (has links)
This thesis presents an econometric test of the offsetting behavior hypothesis concerning drivers of light trucks relative to cars. The main objective is to determine whether drivers of light trucks offset perceived safety benefits associated with larger vehicles by driving more aggressively than drivers of cars, subsequently causing more fatal crashes, holding all else constant. An empirical model using data on pedestrian fatalities across the United States over a five-year period is developed and analyzed in order to capture the desired results. Estimates provide substantial evidence in support of the offsetting behavior hypothesis. To strengthen the case for driver offsetting behavior beyond previous studies, the model is estimated again using pedalcyclist fatalities. The results also point to interesting conclusions regarding the effects of increased speed limits on the behavior of drivers.
9

Geometria da informação quântica: uma abordagem geral acerca do tempo de evolução / Quantum information geometry: a general framework to approach time evolution

Pires, Diego Paiva 20 February 2017 (has links)
As últimas décadas testemunharam intensa atividade de pesquisa teórica e experimental visando compreender o conceito do tempo na mecânica quântica. Este tema desencadeou significante progresso na busca por dispositivos mais rápidos e eficientes no processamento de informação e implementação de tecnologias de comunicação. Motivados pela pergunta quão rápido um sistema quântico evolui sob uma dada dinâmica?, tais avanços levaram a formulação do chamado limite quântico de velocidade ou quantum speed limit, (QSL), i.e., um limite inferior definindo o tempo mínimo de evolução entre estados quânticos distintos. Diversos resultados reportaram QSLs obtidos via tratamentos diferentes e aparentemente desconexos, muitas vezes sob configurações específicas, que deixaram uma lacuna fundamental à resposta da questão geral colocada anteriormente. Neste projeto investigamos como a não-unicidade de uma medida de distinguibilidade de operadores densidade definida no espaço de estados quânticos influencia o QSL e pode ser explorada no intuito de obter limites inferiores mais robustos no tempo de evolução de estados arbitrários. Em particular, baseando-nos no formalismo da geometria da informação, estabelecemos uma família infinita de QSLs válidos para evoluções unitárias e não-unitárias. Este trabalho se propõe unificar e generalizar resultados existentes sobre QSLs na literatura, além de fornecer exemplos de limites mais precisos do que aqueles baseados na informação de Fisher convencional. Em termos físicos, esta investigação é a primeira a destacar o papel das populações e coerências quânticas no cálculo e saturação dos QSLs. Nossos resultados podem encontrar aplicações na otimização de protocolos em computação quântica e metrologia, além de fornecer novos pontos de vista em investigações fundamentais da termodinâmica quântica. / The last decades witnessed intense theoretical and experimental research activity in order to understand the concept of time in quantum mechanics. This subject triggered significant progress in the search for faster and efficient schemes in the implementation of quantum information and communication technologies. Starting from the puzzle How fast can a quantum state evolve under a given dynamics?, such advances have led to the establishment of quantum speed limits (QSLs), i.e., a lower bound setting the minimum time evolution between two distinct quantum states. Past results have included different, apparently unrelated approaches to quantum speed limits, and sometimes tailored to specific settings, which therefore left a fundamental gap in obtaining a satisfactory answer to the general question posed above. In this work we provide a breakthrough for the study and applications of quantum speed limits. We approach the problem from a general information theoretic point of view and we adopt an elegant geometric formalism to construct an infinite family of quantum speed limits valid for closed and open system evolutions. Our description is based on the geometrization of the quantum state space by introducing an information metric which defines a non-unique measure of distinguishability on the state space. We show in particular how our approach incorporates and unifies the previous specialized results, interpreting them under a new comprehensive framework, and allowing us to reach significantly beyond. From the physical point of view, our investigation is the first to highlight the role of populations versus quantum coherences in the determination and saturation of the speed limits. Our results can find applications in the optimization of quantum protocols in quantum computation and metrology, and might provide new insights in fundamental investigations of quantum thermodynamics.
10

Geometria da informação quântica: uma abordagem geral acerca do tempo de evolução / Quantum information geometry: a general framework to approach time evolution

Diego Paiva Pires 20 February 2017 (has links)
As últimas décadas testemunharam intensa atividade de pesquisa teórica e experimental visando compreender o conceito do tempo na mecânica quântica. Este tema desencadeou significante progresso na busca por dispositivos mais rápidos e eficientes no processamento de informação e implementação de tecnologias de comunicação. Motivados pela pergunta quão rápido um sistema quântico evolui sob uma dada dinâmica?, tais avanços levaram a formulação do chamado limite quântico de velocidade ou quantum speed limit, (QSL), i.e., um limite inferior definindo o tempo mínimo de evolução entre estados quânticos distintos. Diversos resultados reportaram QSLs obtidos via tratamentos diferentes e aparentemente desconexos, muitas vezes sob configurações específicas, que deixaram uma lacuna fundamental à resposta da questão geral colocada anteriormente. Neste projeto investigamos como a não-unicidade de uma medida de distinguibilidade de operadores densidade definida no espaço de estados quânticos influencia o QSL e pode ser explorada no intuito de obter limites inferiores mais robustos no tempo de evolução de estados arbitrários. Em particular, baseando-nos no formalismo da geometria da informação, estabelecemos uma família infinita de QSLs válidos para evoluções unitárias e não-unitárias. Este trabalho se propõe unificar e generalizar resultados existentes sobre QSLs na literatura, além de fornecer exemplos de limites mais precisos do que aqueles baseados na informação de Fisher convencional. Em termos físicos, esta investigação é a primeira a destacar o papel das populações e coerências quânticas no cálculo e saturação dos QSLs. Nossos resultados podem encontrar aplicações na otimização de protocolos em computação quântica e metrologia, além de fornecer novos pontos de vista em investigações fundamentais da termodinâmica quântica. / The last decades witnessed intense theoretical and experimental research activity in order to understand the concept of time in quantum mechanics. This subject triggered significant progress in the search for faster and efficient schemes in the implementation of quantum information and communication technologies. Starting from the puzzle How fast can a quantum state evolve under a given dynamics?, such advances have led to the establishment of quantum speed limits (QSLs), i.e., a lower bound setting the minimum time evolution between two distinct quantum states. Past results have included different, apparently unrelated approaches to quantum speed limits, and sometimes tailored to specific settings, which therefore left a fundamental gap in obtaining a satisfactory answer to the general question posed above. In this work we provide a breakthrough for the study and applications of quantum speed limits. We approach the problem from a general information theoretic point of view and we adopt an elegant geometric formalism to construct an infinite family of quantum speed limits valid for closed and open system evolutions. Our description is based on the geometrization of the quantum state space by introducing an information metric which defines a non-unique measure of distinguishability on the state space. We show in particular how our approach incorporates and unifies the previous specialized results, interpreting them under a new comprehensive framework, and allowing us to reach significantly beyond. From the physical point of view, our investigation is the first to highlight the role of populations versus quantum coherences in the determination and saturation of the speed limits. Our results can find applications in the optimization of quantum protocols in quantum computation and metrology, and might provide new insights in fundamental investigations of quantum thermodynamics.

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