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  2. Ocean freight differential - Wikipedia

    en.wikipedia.org/wiki/Ocean_freight_differential

    The Ocean Freight Differential (under United States P.L. 480) refers to the difference between the cost of P.L. 480 shipments that are required to be carried on U.S. flag vessels compared to the cost that would have been incurred had they been carried on lower cost foreign bottoms or vessels. The U.S. government pays this difference either by ...

  3. Mechanism of diving regulators - Wikipedia

    en.wikipedia.org/wiki/Mechanism_of_diving_regulators

    The first stage regulator body generally has several low-pressure outlets (ports) for second-stage regulators, BCD inflators and other equipment; and one or more high-pressure outlets, which allow a submersible pressure gauge (SPG), gas-integrated diving computer or remote wireless pressure transducer to measure the cylinder pressure.

  4. Pressure regulator - Wikipedia

    en.wikipedia.org/wiki/Pressure_regulator

    Diagram symbols for pressure reduction and back pressure regulators. The conceptual difference is mainly in which side the feedback is taken from. A pressure regulator is a valve that controls the pressure of a fluid to a desired value, using negative feedback from the controlled pressure. Regulators are used for gases and liquids, and can be ...

  5. Poppet valve - Wikipedia

    en.wikipedia.org/wiki/Poppet_valve

    The word poppet shares etymology with "puppet": it is from the Middle English popet ("youth" or "doll"), from Middle French poupette, which is a diminutive of poupée.The use of the word poppet to describe a valve comes from the same word applied to marionettes, which, like the poppet valve, move bodily in response to remote motion transmitted linearly.

  6. Plastic limit theorems - Wikipedia

    en.wikipedia.org/wiki/Plastic_limit_theorems

    The two plastic limit theorems apply to any elastic-perfectly plastic body or assemblage of bodies. Lower limit theorem: If an equilibrium distribution of stress can be found which balances the applied load and nowhere violates the yield criterion, the body (or bodies) will not fail, or will be just at the point of failure. [2] Upper limit theorem:

  7. Proportional–integral–derivative controller - Wikipedia

    en.wikipedia.org/wiki/Proportional–integral...

    Pressure control provided only a proportional control that, if the control gain was too high, would become unstable and go into overshoot with considerable instability of depth-holding. The pendulum added what is now known as derivative control, which damped the oscillations by detecting the torpedo dive/climb angle and thereby the rate-of ...

  8. Plastic pipework - Wikipedia

    en.wikipedia.org/wiki/Plastic_pipework

    Plastic Pipe lengths manufactured in Australia by extruding HDPE material.. Plastic pipe is a tubular section, or hollow cylinder, made of plastic.It is usually, but not necessarily, of circular cross-section, used mainly to convey substances which can flow—liquids and gases (fluids), slurries, powders and masses of small solids.

  9. List of accidents and incidents involving military aircraft ...

    en.wikipedia.org/wiki/List_of_accidents_and...

    During first flight of North American F-107A at Edwards AFB, California, prototype, 55-5118, experiences problem with engine gearbox differential pressure during a dive, North American test pilot Bob Baker lands on dry lakebed at just under 200 knots (370 km/h), after rolling about a mile, aircraft hits a depression in the lakebed, nose gear ...

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