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  2. Field propulsion - Wikipedia

    en.wikipedia.org/wiki/Field_propulsion

    Field propulsion is the concept of spacecraft propulsion where no propellant is necessary but instead momentum of the spacecraft is changed by an interaction of the spacecraft with external force fields, such as gravitational and magnetic fields from stars and planets.

  3. Reactionless drive - Wikipedia

    en.wikipedia.org/wiki/Reactionless_drive

    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.

  4. Engineering drawing abbreviations and symbols - Wikipedia

    en.wikipedia.org/wiki/Engineering_drawing...

    CAD: computer-aided design, computer-aided drafting; cadmium [plating]: CAGE: Commercial and Government Entity [code]: A CAGE code is a unique identifier to label an entity (that is, a specific government agency or corporation at a specific site) that is a CDA, ODA, or MFR of the part defined by the drawing.

  5. Glossary of structural engineering - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_structural...

    Most of the terms listed in glossaries are already defined and explained within itself. 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.

  6. Glossary of civil engineering - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_civil_engineering

    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 ...

  7. Breakthrough Propulsion Physics Program - Wikipedia

    en.wikipedia.org/wiki/Breakthrough_Propulsion...

    The Casimir effect was investigated experimentally and analytically under the Breakthrough Propulsion Physics project. This included the construction of MicroElectroMechanical (MEM) rectangular Casimir cavities. [3] [15] Theoretical work showed that the effect could be used to create net forces, although the forces would be extremely small.

  8. Free-piston engine - Wikipedia

    en.wikipedia.org/wiki/Free-piston_engine

    Free-piston engine used as a gas generator to drive a turbine. A free-piston engine is a linear, 'crankless' internal combustion engine, in which the piston motion is not controlled by a crankshaft but determined by the interaction of forces from the combustion chamber gases, a rebound device (e.g., a piston in a closed cylinder) and a load device (e.g. a gas compressor or a linear alternator).

  9. List of non-building structure types - Wikipedia

    en.wikipedia.org/wiki/List_of_non-building...

    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

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