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  2. Engineering drawing abbreviations and symbols - Wikipedia

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

    Revisions beyond "Z" start the alphabet over again with doubling, e.g., AA, AB, AC, AD, and so on. In the days of manual drafting, redrawing was expensive, so engineering orders (EOs, ECOs, DCNs, ECNs) were not always incorporated into a next-letter revision. They thus accompany the drawing as part of the TDP.

  3. Einstein field equations - Wikipedia

    en.wikipedia.org/wiki/Einstein_field_equations

    v. t. e. In the general theory of relativity, the Einstein field equations ( EFE; also known as Einstein's equations) relate the geometry of spacetime to the distribution of matter within it. [1] The equations were published by Albert Einstein in 1915 in the form of a tensor equation [2] which related the local spacetime curvature (expressed by ...

  4. Glossary of motorsport terms - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_motorsport_terms

    A sign on a stick used in pit stops, which is held in front of the car and raised when the pit stop is completed. Though the same basic device is utilized in NASCAR and IndyCar, generic terms such as pit board or sign board are preferred as the sign is not round, but sometimes square, and often is in a specific design unique to the driver or team.

  5. Isothermal process - Wikipedia

    en.wikipedia.org/wiki/Isothermal_process

    Isothermal processes are of special interest for ideal gases. This is a consequence of Joule's second law which states that the internal energy of a fixed amount of an ideal gas depends only on its temperature. [4] Thus, in an isothermal process the internal energy of an ideal gas is constant. This is a result of the fact that in an ideal gas ...

  6. Thermodynamic free energy - Wikipedia

    en.wikipedia.org/wiki/Thermodynamic_free_energy

    In thermodynamics, the thermodynamic free energy is one of the state functions of a thermodynamic system (the others being internal energy, enthalpy, entropy, etc.).The change in the free energy is the maximum amount of work that the system can perform in a process at constant temperature, and its sign indicates whether the process is thermodynamically favorable or forbidden.

  7. Delta-DOR - Wikipedia

    en.wikipedia.org/wiki/Delta-DOR

    Δ-DOR navigation has been used by number of NASA planetary missions. Other space agencies have also used the technique, on missions such as: ESA used a Δ-DOR system for Venus Express' orbit insertion in April 2006 and to Rosetta's Mars swingby in February 2007. The technique was also used in guiding the ExoMars Trace Gas Orbiter during its ...

  8. Delta Sun Bottleneck Stomp - Wikipedia

    en.wikipedia.org/wiki/Delta_Sun_Bottleneck_Stomp

    Delta Sun Bottleneck Stomp. "Delta Sun Bottleneck Stomp" is the second single from Mercury Rev 's fourth studio album, Deserter's Songs. The single was released in the UK on January 25, 1999, and peaked at number 26 on the UK Singles Chart . Mercury Rev drummer Jimy Chambers is credited as the lyrics writer for "Delta Sun Bottleneck Stomp."

  9. Curtis W. Harris - Wikipedia

    en.wikipedia.org/wiki/Curtis_W._Harris

    The council also voted to rename Booker Street (which intersects Rev. C. W. Harris Street), "Ruth Harris Way" in honor of Harris' late wife, Dr. Ruth J. Harris. The Street Sign Ceremony, hosted by the Hopewell City Council, was held at Union Baptist Church on June 15, 2014, to pay tribute to Curtis and Ruth Harris.