These very low frequency (VLF) digitally modulated magnetic signals can travel farther through building materials, water, and soil than conventional communications signals at higher frequencies and, with further advances in receivers and transmitters, could improve communications and mapping indoors at long range, in urban canyons, underwater and underground. (sciencedaily.com)
The Thomas K. McKeon Center for Creativity anchors downtown Tulsa's southern corridor, filling the Boston Avenue urban canyon with creative energy, and providing integrated outdoor spaces for students and the community. (tulsacc.edu)
Above all, there is image after image of the planes crashing into the towers, the ensuing infernos and structural cataclysms, and the infernal clouds of black smoke and debris surging like tidal waves into the surrounding urban canyons. (firstthings.com)