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In contrast, examples of proposals for field propulsion that rely on physics outside the present paradigms are various schemes for faster-than-light, warp drive and antigravity, and often amount to little more than catchy descriptive phrases, with no known physical basis [citation needed]. Until it is shown that the conservation of energy and ...
A reactionless drive is a hypothetical device producing motion without the exhaust of a propellant.A propellantless drive is not necessarily reactionless when it constitutes an open system interacting with external fields; but a reactionless drive is a particular case of a propellantless drive that is a closed system, presumably in contradiction with the law of conservation of momentum.
Also Abrams' water-cement ratio law. A law which states that the strength of a concrete mix is inversely related to the mass ratio of water to cement. As the water content increases, the strength of the concrete decreases. abrasion The process of scuffing, scratching, wearing down, marring, or rubbing away a substance or substrate. It can be intentionally imposed in a controlled process using ...
For example, the particles of stone used to make concrete typically include both sand and gravel. Aggregate (construction) – Construction aggregate is a broad category of coarse to medium grained particulate material used in construction, including sand, gravel, crushed stone, slag, recycled concrete and geosynthetic aggregates.
However, glossaries like this one are useful for looking up, comparing and reviewing large numbers of terms together. You can help enhance this page by adding new terms or writing definitions for existing ones. This glossary of mechanical engineering terms pertains specifically to mechanical engineering and its sub-disciplines.
Eiffel Tower Brandenburg Gate The Arcade du Cinquantenaire in Brussels, Belgium Golden Gate Bridge Kapellbrücke (Chapel Bridge), a covered bridge in Lucerne, Switzerland The Olmsted ramada over the Big House of Casa Grande National Monument in Arizona Silos in Acatlán, Hidalgo, Mexico Transmission tower near Le Cluzeau, Saint-Romain, France The Triumphal Arch of Orange, France
Magnetic sail animation. A magnetic sail is a proposed method of spacecraft propulsion where an onboard magnetic field source interacts with a plasma wind (e.g., the solar wind) to form an artificial magnetosphere (similar to Earth's magnetosphere) that acts as a sail, transferring force from the wind to the spacecraft requiring little to no propellant as detailed for each proposed magnetic ...
Constructability review is a process of reviewing design documents, construction drawings, specifications, and other construction documentation intended for use by a builder to construct the project. The purpose of a constructability review is to eliminate design errors, omissions, and coordination issues prior to bidding the documents so that ...