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Description of a very high speed transit (VHST) system operating in its own rarefied atmosphere in evacuated tubes in underground tunnels. Most cases considered took less time to go coast-to-coast (e.g., 21 min) than it takes an aircraft to climb to an efficient operating altitude.
- Robert M. Salter
- Paperback
- 1972
Find out all information about tunnelling and underground space: Usage, construction, reasons to build underground as well as some feedback on history, through important cases, a detailed images gallery and related documents.
Features. Coire Glas Exploratory Tunnel – Achieving to the record of 1000m. By Rose Bell. July 1, 2024. As UK’s first large-scale pumped storage scheme to be developed in 40 years, exploratory tunneling at the site has reached 1000m. On December ...
En raison du développement urbain et grâce à l’amélioration des techniques de construction, nous sommes aujourd’hui amenés à construire des tunnels sous nos villes.
5 sept. 2014 · Though tunnel warfare may seem exotic, it is hardly a new phenomenon. For millennia, tunnelers have used secret subterranean passageways to undermine fortifications, bypass defenses, elude legal authorities, and launch covert attacks. The elaborate tunnel networks of Gaza are just the latest example. Imagining ancient and medieval ...
13 juin 2024 · Il doit réaliser un tunnel de 6,7 kilomètres entre la future gare de Guyancourt jusqu'à un ouvrage situé à proximité de la gare Versailles-Chantiers, dans les Yvelines. Le tunnel permettra...
4 oct. 2011 · The authors explore six potential approaches to pricing the use of National Aeronautics and Space Administration (NASA) wind-tunnel test facilities, and they evaluate each approach against three criteria -- efficiency, fiscal impact, and fairness.
