Traffic congestion causes huge economic loss worldwide in every year due to wasted fuel, excessive air pollution, lost time, and reduced productivity. Understanding how humans move and select the transportation mode throughout a large-scale transportation network is vital for urban congestion prediction and transportation scheduling. In this study, we collect big and heterogeneous data (e.g., G...

This paper presents an analysis of the topology of transportation networks within different systems of cities. Urban entities and their components are complex systems by their nature; there is no central force that affects their spatial structure. Thus, we study transportation networks within different countries as complex networks. Based on the above, we consider cities as nodes, while direct ...

The U.S. Air Transportation Systems faces substantial challenges in transforming to meet future demand. These challenges need to be understood and addressed in order to successfully meet future system needs. This paper uses a feedback model to describe the general system transition process and identify key issues in the dynamics of system transition, with particular emphasis on stakeholder cost...

This paper examines linkages among transportation intensity, the extent of urbanization, CO2 emissions, and economic growth. We use two measures of transportation intensity: (i) per-capita rates of utilization of air-passenger transport facilities and (ii) per-capita rates of utilization of air-freight transport facilities. By studying the G-20 countries over the period 1961e2012 and employing ...

In this study, we successfully designed and tested a new micropump that utilizes an active check valve and bottom-protruding structure to achieve sample transportation. We performed theoretical analyses and numerical simulations to determine the optimal location of the active check valve. We also experimentally analyzed variations in the generated flow rate with respect to the pneumatic frequen...

In air transportation networks the robustness of a network regarding node and link failures is a key factor for its design. At the same time, travelling passengers usually prefer the itinerary with fewer legs. In this paper the authors propose three design methods, which can maximize the air transportation network robustness and make sure every itinerary within this network have fewer legs than...

Transportation noise contains significant low frequency components. It is difficult to sound insulate buildings against transportation noise because wall cavities are only effective in increasing sound insulation above the mass-air-mass resonance frequency. Stud walls can also have a significant structural resonance in this low frequency range, although it is not yet clear if this is significan...

In this article, the authors describe a model of the U.S. air transportation network in which air traffic service provider and airline decision making, the impacts of weather on airport capacity and decision making, the effects of stochastic phenomenon, and the movement of aircraft, crews, and passengers are simulated. The details of the underlying discrete event simulation framework and the co...

Reducing greenhouse gas emissions from the transportation sector may be the most difficult aspect of climate change mitigation. We suggest that carbon neutral hydrocarbons (CNHCs) offer an alternative pathway for deep emission cuts that complement the use of decarbonized energy carriers. Such fuels are synthesized from atmospheric carbon dioxide (CO2) and carbon neutral hydrogen. The result is ...

At the Institute of Air Transportation Systems of the German Aerospace Centre (DLR), methods for collaborative design are systematically developed and assessed. These collaborative design approaches are used to gain knowledge on the overall air transportation system. A collaborative working environment–the Integrated Design Laboratory (IDL) is established. It forms an experimental technical pla...