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  2. Special use airspace - Wikipedia

    en.wikipedia.org/wiki/Special_use_airspace

    To protect persons and property in the air or on the surface from an existing or imminent hazard associated with an incident on the surface when the presence of low flying aircraft would magnify, alter, spread, or compound that hazard. These include public figure visits, disaster relieves, sports events, and space-launch missions. [7]: 3-5-3.b

  3. Federal Acquisition Regulation - Wikipedia

    en.wikipedia.org/wiki/Federal_Acquisition_Regulation

    The authority under FAR Part 12, Commercial Items (and services), must be used thoughtfully and carefully. It is very tempting for a contracting officer to use FAR Part 12 and hence FAR Part 13 in situations where such use is clearly not appropriate in view of the basic reasons commercial item acquisition authority was created by Congress.

  4. Federal Aviation Regulations - Wikipedia

    en.wikipedia.org/wiki/Federal_Aviation_Regulations

    Title 14 CFR – Aeronautics and Space is one of the fifty titles that make up the United States Code of Federal Regulations (CFR). Title 14 is the principal set of rules and regulations (sometimes called administrative law) issued by the Department of Transportation and Federal Aviation Administration, federal agencies of the United States which oversee Aeronautics and Space.

  5. 'Pataphysics - Wikipedia

    en.wikipedia.org/wiki/'Pataphysics

    One definition of 'pataphysics is that it is "a branch of philosophy or science that examines imaginary phenomena that exist in a world beyond metaphysics; it is the science of imaginary solutions." [ 7 ] Jean Baudrillard defines 'pataphysics as "the imaginary science of our world, the imaginary science of excess, of excessive, parodic ...

  6. Surface equivalence principle - Wikipedia

    en.wikipedia.org/wiki/Surface_equivalence_principle

    With the appropriate choice of the imaginary current densities, the fields inside the surface or outside the surface can be deduced from the imaginary currents. [4] In a radiation problem with given current density sources, electric current density J 1 {\displaystyle J_{1}} and magnetic current density M 1 {\displaystyle M_{1}} , the tangential ...

  7. Penetration depth - Wikipedia

    en.wikipedia.org/wiki/Penetration_depth

    Since the power of a wave in a particular medium is proportional to the square of a field quantity, one may speak of a penetration depth at which the magnitude of the electric (or magnetic) field has decayed to 1/e of its surface value, and at which point the power of the wave has thereby decreased to / or about 13% of its surface value:

  8. List of fictional elements, materials, isotopes and subatomic ...

    en.wikipedia.org/wiki/List_of_fictional_elements...

    A classical element referred to as the Fifth Element in ancient and medieval times. It is believed to be the material that fills the region of the universe beyond the terrestrial sphere. This belief goes as far back as Plato's Timaeus, where it is said that "there is the most translucent kind which is called by the name of aether (αἰθήρ ...

  9. Riemann surface - Wikipedia

    en.wikipedia.org/wiki/Riemann_surface

    There are several equivalent definitions of a Riemann surface. A Riemann surface X is a connected complex manifold of complex dimension one. This means that X is a connected Hausdorff space that is endowed with an atlas of charts to the open unit disk of the complex plane: for every point x ∈ X there is a neighbourhood of x that is homeomorphic to the open unit disk of the complex plane, and ...