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  2. Swirl function - Wikipedia

    In mathematics, swirl functions are special functions defined as follows :. S ( k , n , r , θ ) = sin ⁡ ( k cos ⁡ ( r ) − n θ ) {\displaystyle S (k,n,r,\theta )=\sin (k\cos (r)-n\theta )} where k and n are integers, and r and θ are polar coordinates . When these functions are graphed, they usually resemble a swirling fan blade, where ...

  3. Bacillus subtilis - Wikipedia

    Bacillus subtilis, known also as the hay bacillus or grass bacillus, is a Gram-positive, catalase -positive bacterium, found in soil and the gastrointestinal tract of ruminants, humans and marine sponges. [3] [4] As a member of the genus Bacillus, B. subtilis is rod-shaped, and can form a tough, protective endospore, allowing it to tolerate ...

  4. Public relations - Wikipedia

    Media conferences are one approach used in public relations. Public relations ( PR) is the practice of managing and disseminating information from an individual or an organization (such as a business, government agency, or a nonprofit organization) to the public in order to affect their public perception.

  5. Cribriform plate - Wikipedia

    In mammalian anatomy, the cribriform plate, horizontal lamina or lamina cribrosa is part of the ethmoid bone. It is received into the ethmoidal notch of the frontal bone and roofs in the nasal cavities. It supports the olfactory bulb, and is perforated by olfactory foramina for the passage of the olfactory nerves to the roof of the nasal cavity ...

  6. Wave function - Wikipedia

    The wave function is a complex-valued probability amplitude, and the probabilities for the possible results of measurements made on the system can be derived from it. The most common symbols for a wave function are the Greek letters ψ and Ψ (lower-case and capital psi, respectively).

  7. Prandtl–Meyer expansion fan - Wikipedia–Meyer_expansion_fan

    A supersonic expansion fan, technically known as Prandtl–Meyer expansion fan, a two-dimensional simple wave, is a centered expansion process that occurs when a supersonic flow turns around a convex corner. The fan consists of an infinite number of Mach waves, diverging from a sharp corner. When a flow turns around a smooth and circular corner ...

  8. Trigonometric functions - Wikipedia

    Using this standard notation, the argument x for the trigonometric functions satisfies the relationship x = (180 x / π )°, so that, for example, sin π = sin 180° when we take x = π. In this way, the degree symbol can be regarded as a mathematical constant such that 1° = π /180 ≈ 0.0175. Unit-circle definitions [ edit]