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Since its founding, NASA has been dedicated to the advancement of aeronautics and space science. The NASA Scientific and Technical Information (STI) Program Office plays a key part in helping NASA maintain this important role. The NASA STI Program Office is operated by Langley Research Center, the lead center for NASA's scientific and technical information.… (More)
Previous studies on physical boundary conditions for flame–boundary interactions of an ideal, multicomponent, compressible gas have neglected reactive source terms in their boundary condition treatments. By combining analyses of incompletely parabolic systems with those based on the hyperbolic Euler equations, a rational set of boundary conditions is… (More)
Acknowledgments The authors would like to thank B.
Understanding the drivers of energy and material flows of cities is important for addressing global environmental challenges. Accessing, sharing, and managing energy and material resources is particularly critical for megacities, which face enormous social stresses because of their sheer size and complexity. Here we quantify the energy and material flows… (More)
The expected urbanization of the planet in the coming century coupled with aging infrastructure in developed regions, increasing complexity of man-made systems, and pressing climate change impacts have created opportunities for reassessing the role of infrastructure and technologies in cities and how they contribute to greenhouse gas (GHG) emissions. Modern… (More)
Independent lines of research on urbanization, urban areas, and carbon have advanced our understanding of some of the processes through which energy and land uses affect carbon. This synthesis integrates some of these diverse viewpoints as a first step toward a coproduced, integrated framework for understanding urbanization, urban areas, and their… (More)
Many have recognized the importance of cities in addressing pressing global environmental threats, including climate change, water stress, loss of biodiversity, and resource scarcity (Grimm et al. This special issue demonstrates how practical solutions to the development of sustainable cities can be achieved through studying urban metabolism, urban ecology,… (More)