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  2. Specific impulse - Wikipedia

    en.wikipedia.org/wiki/Specific_impulse

    Specific impulse (usually abbreviated I sp) is a measure of how efficiently a reaction mass engine, such as a rocket using propellant or a jet engine using fuel, generates thrust. In general, this is a ratio of the impulse , i.e. change in momentum, per mass of propellant.

  3. Spontaneous potential logging - Wikipedia

    en.wikipedia.org/wiki/Spontaneous_potential_logging

    Spontaneous potential log, commonly called the self potential log or SP log, is a passive measurement taken by oil industry well loggers to characterise rock formation properties. The log works by measuring small electric potentials (measured in millivolts) between depths with in the borehole and a grounded electrode at the surface.

  4. Substitution–permutation network - Wikipedia

    en.wikipedia.org/wiki/Substitution–permutation...

    For a given amount of confusion and diffusion, an SP network has more "inherent parallelism" [2] and so — given a CPU with many execution units — can be computed faster than a Feistel network. [3] CPUs with few execution units — such as most smart cards — cannot take advantage of this inherent parallelism.

  5. Floating point operations per second - Wikipedia

    en.wikipedia.org/wiki/Floating_point_operations...

    Built using commercially available parts. Three AMD RX Vega 64 graphics cards provide just over 75 TFLOPS half precision (38 TFLOPS SP or 2.6 TFLOPS DP when combined with the CPU) at ~$2,050 for the complete system. [91] November 2020 3.14¢ 3.7¢ AMD Ryzen 3600 & 3× NVIDIA RTX 3080 system AMD Ryzen 3600 @ 484 GFLOPS & $199.99

  6. Hildebrand solubility parameter - Wikipedia

    en.wikipedia.org/wiki/Hildebrand_solubility...

    The Hildebrand solubility parameter is the square root of the cohesive energy density: =. The cohesive energy density is the amount of energy needed to completely remove a unit volume of molecules from their neighbours to infinite separation (an ideal gas).

  7. Spitzer resistivity - Wikipedia

    en.wikipedia.org/wiki/Spitzer_resistivity

    The Spitzer resistivity (or plasma resistivity), also called 'Spitzer-Harm resistivity', is an expression describing the electrical resistance in a plasma, which was first formulated by Lyman Spitzer in 1950.

  8. Conversion between quaternions and Euler angles - Wikipedia

    en.wikipedia.org/wiki/Conversion_between...

    Spatial rotations in three dimensions can be parametrized using both Euler angles and unit quaternions.This article explains how to convert between the two representations. Actually this simple use of "quaternions" was first presented by Euler some seventy years earlier than Hamilton to solve the problem of magic squar

  9. Standardized Kt/V - Wikipedia

    en.wikipedia.org/wiki/Standardized_Kt/V

    It is complex and tedious to calculate, although web-based calculators are available to do this fairly easily. Many nephrologists have difficulty understanding it. Urea is not associated with toxicity. [4] Standardized Kt/V only models the clearance of urea and thus implicitly assumes the clearance of urea is comparable to other toxins.