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  2. Standard penetration test - Wikipedia

    en.wikipedia.org/wiki/Standard_penetration_test

    The standard penetration test (SPT) is an in-situ dynamic penetration test designed to provide information on the geotechnical engineering properties of soil. This test is the most frequently used subsurface exploration drilling test performed worldwide.

  3. List of abbreviations in oil and gas exploration and production

    en.wikipedia.org/wiki/List_of_abbreviations_in...

    SPT – shallower pool test, Lahee classification [citation needed] SPUD – spud date (started drilling well) SPWLA – Society of Petrophysicists and Well Log Analysts [29] SQL – seismic quicklook log; SQZ – squeeze job; SR – shear rate

  4. Symmetry-protected topological order - Wikipedia

    en.wikipedia.org/wiki/Symmetry-protected...

    Symmetry-protected topological (SPT) order [1] [2] is a kind of order in zero-temperature quantum-mechanical states of matter that have a symmetry and a finite energy gap.. To derive the results in a most-invariant way, renormalization group methods are used (leading to equivalence classes corresponding to certain fixed points). [1]

  5. Single-particle tracking - Wikipedia

    en.wikipedia.org/wiki/Single-particle_tracking

    Single-particle tracking (SPT) is the observation of the motion of individual particles within a medium. The coordinates time series, which can be either in two dimensions (x, y) or in three dimensions (x, y, z), is referred to as a trajectory. The trajectory is typically analyzed using statistical methods to extract information about the ...

  6. Velocity stack - Wikipedia

    en.wikipedia.org/wiki/Velocity_stack

    Short velocity stacks on a 302 cu.in. Ford FE engine in the tight confines of a Ford GT-40. A velocity stack, trumpet, or air horn [1] is a typically flared, parallel-sided tubular device fitted individually or in groupings to the entry of an engine's air intake system to smooth high speed airflow, and allow engine intake track tuning to incorporate pressure pulses created by its internal ...

  7. Hall-effect thruster - Wikipedia

    en.wikipedia.org/wiki/Hall-effect_thruster

    Thrust of the first generation of SPT engines, SPT-50 and SPT-60 was 20 and 30 mN respectively. In 1982, the SPT-70 and SPT-100 were introduced, their thrusts being 40 and 83 mN, respectively. In the post-Soviet Russia high-power (a few kilowatts ) SPT-140 , SPT-160, SPT-200, T-160, and low-power (less than 500 W) SPT-35 were introduced.

  8. Serine C-palmitoyltransferase - Wikipedia

    en.wikipedia.org/wiki/Serine_C-palmitoyltransferase

    SPT, 3-oxosphinganine synthetase, and; acyl-CoA:serine C-2 acyltransferase decarboxylating. Structure. Serine C-palmitoyltransferase is a member of the AOS (a ...

  9. SPT-140 - Wikipedia

    en.wikipedia.org/wiki/SPT-140

    SPT-140 is a solar-powered Hall-effect ion thruster, part of the SPT-family of thrusters. SPT stands for Stationary Plasma Thruster . [ 1 ] [ 2 ] Like other members of the SPT series, it creates a stream of electrically charged xenon ions accelerated by an electric field and confined by a magnetic field.