Time Domain Boundary Element Method Prediction Of Noise Shielding By A Naca 0012 Airfoil,
2021
Old Dominion University
Time Domain Boundary Element Method Prediction Of Noise Shielding By A Naca 0012 Airfoil, Douglas M. Nark, Fang Q. Hu
Mathematics & Statistics Faculty Publications
As aircraft noise constraints become more stringent and the number/mixture of aircraft configurations grows, it becomes more important to understand the interaction of individual aircraft noise sources with nearby aircraft structures. Understanding these interactions and exploring possible approaches to mitigate or exploit their acoustic impact is essential for overcoming key noise barriers. This paper describes the further validation of a time domain boundary element approach for the prediction of the interactions between incident noise sources and nearby aircraft structures. Predictions were completed for multiple source locations and comparisons of these results with measured data are presented. Overall, very good agreement …
Conceptual Development Of A Probabilistic Graphical Framework For Assessing Port Resilience,
2021
Old Dominion University
Conceptual Development Of A Probabilistic Graphical Framework For Assessing Port Resilience, Katherine Smith, Rafael Diaz, Yuzhong Shen, Francesco Longo
VMASC Publications
Technological advances such as cyber physical systems and autonomous vehicles combined with increased disruptions including the Covid-19 pandemic and coastal natural disasters have heightened the importance of port risk analysis methodologies and frameworks that can accurately quantify and optimize resilience. This work presents the conceptual development of a novel combination of analysis methodologies linking a probabilistic graphic approach on a network of risk events with a functional dependency approach on a system network. Key advantages of these two methodologies are the ability to model and learn causal interactions rather than simply correlations and a high level of computational efficiency. This …
How American Transit Agencies Determine Fare Policy: It All Comes Down To Politics,
2021
Claremont Colleges
How American Transit Agencies Determine Fare Policy: It All Comes Down To Politics, Julian Thesseling
CMC Senior Theses
This paper will provide readers with an understanding of the variables that US transit agencies grapple with when developing fare policy, with a particular focus on the political process. The framework chapter will examine the objectives of public transportation and how agencies face difficulties in achieving these objectives. While this paper will focus on American transportation policy, the framework will draw from the experiences of cities across the world. Three case study chapters will then each discuss an American city or region’s approach to fare policy, and how variables have either complicated or enhanced agencies’ ability to develop effective fare …
Workshop Outcomes Report: 1st International Workshop On Seismic Resilience Of Arctic Infrastructure And Social Systems,
2021
University of New Hampshire - Main Campus
Workshop Outcomes Report: 1st International Workshop On Seismic Resilience Of Arctic Infrastructure And Social Systems, Majid Ghayoomi, Katharine Duderstadt, Alexander Kholodov, Alexander Shiklomanov, Matthew Turner, Elham Ajorlou
Faculty Publications
No abstract provided.
Numerical Investigations Of Transient Wind Shear From Passing Vehicles Near A Road Structure (Part I: Unsteady Reynolds-Averaged Navier-Stokes Simulations),
2021
California State University, Long Beach
Numerical Investigations Of Transient Wind Shear From Passing Vehicles Near A Road Structure (Part I: Unsteady Reynolds-Averaged Navier-Stokes Simulations), Hamid Rahai, Assma Begum
Mineta Transportation Institute
In this research, the authors performed unsteady numerical simulations of a moving Ahmed body under a freeway overpass at different distances from the bridge columns in order to evaluate transient wind shear and the wind load on these columns. Results have shown that when the vehicle is at 0.75W distance from the bridge columns, an unsteady wind speed of up to 24 m/s is observed at the columns with a pressure coefficient difference of 0.9. Here W is the width of the vehicle. These results indicate with an appropriate system for harnessing these wind energy potentials, significant renewable electric power …
Developing Guidelines For Assessing The Effectiveness Of Intelligent Compaction Technology,
2021
California State University, Los Angeles
Developing Guidelines For Assessing The Effectiveness Of Intelligent Compaction Technology, Mehran Mazari, Siavash F. Aval, Siddharth M. Satani, David Corona, Joshua Garrido
Mineta Transportation Institute
Many factors affect pavement compaction quality, which can vary. Such variability may result in an additional number of passes required, extended working hours, higher energy consumption, and negative environmental impacts. The use of Intelligent Compaction (IC) technology during construction can improve the quality and longevity of pavement structures while reducing risk for contractors and project owners alike. This study develops guidelines for the implementation of IC in the compaction of pavement layers as well as performing a preliminary life-cycle cost analysis (LCCA) of IC technology compared to the conventional compaction approach. The environmental impacts of the improved construction process were …
Tod And Park-And-Ride: Which Is Appropriate Where?,
2021
Mineta Transport Institute
Tod And Park-And-Ride: Which Is Appropriate Where?, John Niles, J.M. Pogodzinski
Mineta Transportation Institute
Despite the sharp drop in transit ridership throughout the USA that began in March 2020, two different uses of land near transit stations continue to be implemented in the United States to promote ridership. Since 2010, transit agencies have given priority to multi-family residential construction referred to as transit oriented development (TOD), with an emphasis on housing affordability. In second place for urban planners but popular with suburban commuters is free or inexpensive parking near rail or bus transit centers, known as park-and-ride (PnR). Sometimes, TOD and PnR are combined in the same development. Public policy seeks to gain high …
Using Beam Software To Simulate The Introduction Of On-Demand, Automated, And Electric Shuttles For Last Mile Connectivity In Santa Clara County,
2021
Mineta Transportation Institute
Using Beam Software To Simulate The Introduction Of On-Demand, Automated, And Electric Shuttles For Last Mile Connectivity In Santa Clara County, Gary Hsueh, David Czerwinski, Cristian Poliziani, Terris Becker, Alexandre Hughes, Peter Chen, Melissa Benn
Mineta Transportation Institute
Despite growing interest in low-speed automated shuttles, pilot deployments have only just begun in a few places in the U.S., and there is a lack of studies that estimate the impacts of a widespread deployment of automated shuttles designed to supplement existing transit networks. This project estimated the potential impacts of automated shuttles based on a deployment scenario generated for a sample geographic area: Santa Clara County, California. The project identified sample deployment markets within Santa Clara County using a GIS screening exercise; tested the mode share changes of an automated shuttle deployment scenario using BEAM, an open-source beta software …
Important Not To Let Hsr Termination Hobble Further Cooperation,
2021
Singapore Management University
Important Not To Let Hsr Termination Hobble Further Cooperation, Tan K. B. Eugene
Research Collection Yong Pung How School Of Law
Strong people-to-people ties can help temper political histrionics, moderate negative impact on political ties. The tantalising prospect of being able to leave Singapore and arrive in Kuala Lumpur in just 90 minutes remains a pipe dream after the High Speed Rail (HSR) agreement was terminated last Friday, along with what could have been an important confidence booster to bilateral ties between Singapore and Malaysia.
Public Transit Infrastructure And Heat Perceptions In Hot And Dry Climates,
2021
Singapore Management University
Public Transit Infrastructure And Heat Perceptions In Hot And Dry Climates, Yuliya Dzyuban, David M. Hondula, Paul J. Coseo, Charles L. Redman
Research Collection College of Integrative Studies
Many cities aim to progress toward their sustainability and public health goals by increasing use of their public transit systems. However, without adequate protective infrastructure that provides thermally comfortable conditions for public transit riders, it can be challenging to reach these goals in hot climates. We took micrometeorological measurements and surveyed riders about their perceptions of heat and heat-coping behaviors at bus stops with a variety of design attributes in Phoenix, AZ, USA, during the summer of 2018. We identified the design attributes and coping behaviors that made riders feel cooler. We observed that current infrastructure standards and material choices …
The (Digital) Medium Of Mobility Is The Message: Examining The Influence Of E-Scooter Mobile App Perceptions On E-Scooter Use Intent,
2021
Singapore Management University
The (Digital) Medium Of Mobility Is The Message: Examining The Influence Of E-Scooter Mobile App Perceptions On E-Scooter Use Intent, Rabindra Ratan, Kelsey Earle, Sonny Rosenthal, Vivian Hsueh Hua Chen, Andrew Gambiro, Gerard Goggin, Hallam Stevens, Benjamin Li, Kwan Min Lee
Research Collection College of Integrative Studies
The present research examines how perceptions of e-scooter mobile apps (i.e., a communication technology) influence intent to use e-scooters (i.e., a transportation technology) while considering other perceptions specific to e-scooters (ease of use, usefulness, safety, environmental impact, and enjoyment), context of use (geographic landscape), and demographic factors (age and sex). Results suggest mobile app perceived ease of use is associated with e-scooter use intent and this effect is mediated by e-scooter perceived usefulness, even when controlling for e-scooter perceived ease of use as well as other influential elements of e-scooter use. In addition to illustrating the importance of user experiences …
Strategies For Retaining Employees In The Trucking Industry,
2021
Walden University
Strategies For Retaining Employees In The Trucking Industry, Dionne Bell- Pursley
Walden Dissertations and Doctoral Studies
Employee turnover is a recurring problem in organizations, affecting performance and productivity while depleting organizational resources. High driver turnover rates raise a company’s operating costs and reduce driver productivity, service quality, and highway safety in the trucking industry. When trucking industry leaders understand such factors, they can develop and implement strategies to increase truck driver retention. Grounded in Herzberg’s two-factor theory and supported by Maslow’s hierarchy of needs theory, the purpose of this single case study was to explore strategies trucking company leaders use to increase truck driver retention. The participants included eight executives from trucking companies in the southeast …
Social Exclusion And Community Severance In Impoverished Neighborhoods,
2021
Walden University
Social Exclusion And Community Severance In Impoverished Neighborhoods, Melissa Kerry Stickel
Walden Dissertations and Doctoral Studies
Transportation infrastructure, such as highways and interstates, creates a barrier that can physically limit access to those living in adjacent neighborhoods, a phenomenon known as community severance. In addition to creating a physical disconnect, these infrastructures can leave residents feeling socially isolated and excluded from the rest of the community. This qualitative single-case study focused on social exclusion and community severance and problems arising from the U.S. transportation network, addressing the development of the interstate system and its possible impacts on communities. The exclusionary effects of transportation-related severance were well supported in the literature. However, most of research had been …
Transnational Threats To Maritime Systems And Seaport Security,
2021
Walden University
Transnational Threats To Maritime Systems And Seaport Security, Eric L. Hampton
Walden Dissertations and Doctoral Studies
An assessment of a 16-year period since the 9/11 attacks indicated that more than 14,000 security breaches in which security measures at seaports were circumvented due to vulnerabilities occurred and more than 24,000 suspicious activity reports were made. The susceptibility of United States’ seaports to groups engaged in criminal activities, including drug trafficking, cargo theft, and smuggling of contraband and people undermines security practices and renders the nation vulnerable to acts of terrorism. The purpose of this qualitative study was to explore seaport security measures to identify and understand internal and external factors that may impact protection practices at U.S. …
Putting Policy In Its Place: Policy Enactment And Engagement Through A Multiscalar Policy-Shed Framework,
2021
West Virginia University
Putting Policy In Its Place: Policy Enactment And Engagement Through A Multiscalar Policy-Shed Framework, Barbara L. Maclennan
Graduate Theses, Dissertations, and Problem Reports (ETD)
The objective of this research is to examine the spatial components integral to policy formation, implementation, and evaluation. The research uses solid waste as a case study to explore a multiscalar GIS policy-shed framework. To this end, the goal of this dissertation is to examine the spatial nature of public policy. The research applies spatial concepts and multiscalar methodological applications embedded within GIS and geovisualization to explore the complex spaces surrounding public policy implementation and evaluation.
Perspectives On Cyber Security For Offshore Oil And Gas Assets,
2021
World Maritime University
Perspectives On Cyber Security For Offshore Oil And Gas Assets, Iosif Progoulakis, Nikitas Nikitakos, Paul Rohmeyer, Barry Bunin, Dimitrios Dalaklis, Stavros Karamperidis
Articles
In an ever-evolving technological industry, the oil and gas sector is already moving forward through the adaptation of Industry 4.0 and the adaptation of advanced cyber technologies through Oil and Gas 4.0. As IT/OT (information technology/operational technology) systems are evolving technologically, so are the cyber security threats faced by the offshore oil and gas assets. This paper aims to raise the awareness of cyber security threats and the organizational and technical measures that need to be adopted by the oil and gas industry for remote and complex assets in the upstream sector. A comprehensive literature review covering the areas of …
Liquefied Natural Gas As Ship Fuel : A Maltese Regulatory Gap Analysis,
2021
World Maritime University
Liquefied Natural Gas As Ship Fuel : A Maltese Regulatory Gap Analysis, Mark Philip Cassar, Dimitrios Dalaklis, Fabio Ballini, Seyedvahid Vakili
Articles
With water covering almost three-quarters of the Earth’s surface and by factoring in that the maritime transport industry is holding a comparative advantage in relation to all other means, activities associated with the seas and oceans of our planet are extremely vital for a normal functioning of global trade. Furthermore, evaluating the opportunities of the so-called “Blue Economy” and possibilities for further growth should be at the epicentre of future development plans. Indicative examples - apart from various endeavours of maritime transport - include other sectors, like shipbuilding and repairs, fishing activities and related processes, as well as oil and …
Can Market-Based Measures Stimulate Investments In Green Technologies For The Abatement Of Ghg Emissions From Shipping? A Review Of Proposed Market-Based Measures,
2021
World Maritime University
Can Market-Based Measures Stimulate Investments In Green Technologies For The Abatement Of Ghg Emissions From Shipping? A Review Of Proposed Market-Based Measures, Anastasia Christodoulou, Dimitrios Dalaklis, Aykut Ölcer, Fabio Ballini
Articles
In order for the maritime sector to align itself with the targets set by the Paris Agreement, it should reduce its GHG emissions by at least 50% by 2050 compared to 2008 with the ultimate aim to phase them out entirely. It is along these lines that in April 2018 the International Maritime Organisation (IMO) developed a strategy, consisting of a range of potential technical and operational measures to reduce GHG emissions from international shipping, ranking from improvements on ship design to the employment of alternative fuels. In order to stimulate the adoption of these policies, the IMO also considers …
Maritime Robotics And Autonomous Systems Operations : Exploring Pathways For Overcoming International Techno-Regulatory Data Barriers,
2021
World Maritime University
Maritime Robotics And Autonomous Systems Operations : Exploring Pathways For Overcoming International Techno-Regulatory Data Barriers, Tafsir Martin Johansson, Dimitrios Dalaklis, Aspasia Pastra
Articles
The current regulatory landscape that applies to maritime service robotics, aptly termed as robotics and autonomous systems (RAS), is quite complex. When it comes to patents, there are multifarious considerations in relation to vessel survey, inspection, and maintenance processes under national and international law. Adherence is challenging, given that the traditional delivery methods are viewed as unsafe, strenuous, and laborious. Service robotics, namely micro aerial vehicles (MAVs) or drones, magnetic-wheeled crawlers (crawlers), and remotely operated vehicles (ROVs), function by relying on the architecture of the Internet of Robotic Things. The aforementioned are being introduced as time-saving apparatuses, accompanied by the …
The Social Dimension In Transportation Planning/ البعد الاجتماعي في نظام تخطيط النقل العام في مصر,
2021
American University in Cairo
The Social Dimension In Transportation Planning/ البعد الاجتماعي في نظام تخطيط النقل العام في مصر, Ahmed Hamdy, Fatma Rashad, Lama Atef
Papers, Posters, and Presentations
Public transportation is a main player in Egyptians’ daily lives. It links production and consumption areas in many vital aspects, including economy, construction, and social development. Accordingly, the accessibility of citizens to public transportation and its services has been adopted as a social dimension for it in this paper, as it affects the lives of many segments of Egyptians.
