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  2. Microsoft PowerPoint - Wikipedia

    en.wikipedia.org/wiki/Microsoft_PowerPoint

    Microsoft PowerPoint is a presentation program, [ 8 ] created by Robert Gaskins, Tom Rudkin and Dennis Austin [ 8 ] at a software company named Forethought, Inc. [ 8 ] It was released on April 20, 1987, [ 9 ] initially for Macintosh computers only. [ 8 ]

  3. Prandtl–Meyer expansion fan - Wikipedia

    en.wikipedia.org/wiki/Prandtl–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 ...

  4. Hand fan - Wikipedia

    en.wikipedia.org/wiki/Hand_fan

    Handheld Brise fan from 1800. A handheld fan, or simply hand fan, is a broad, flat surface that is waved back-and-forth to create an airflow. Generally, purpose-made handheld fans are folding fans, which are shaped like a sector of a circle and made of a thin material (such as paper or feathers) mounted on slats which revolve around a pivot so that it can be closed when not in use.

  5. Fan (machine) - Wikipedia

    en.wikipedia.org/wiki/Fan_(machine)

    A household electric fan. A large cylindrical fan. A fan is a powered machine used to create a flow of air. A fan consists of a rotating arrangement of vanes or blades, generally made of wood, plastic, or metal, which act on the air. The rotating assembly of blades and hub is known as an impeller, rotor, or runner.

  6. Katy Perry Says Her Level of Respect for Her Parents 'Went ...

    www.aol.com/katy-perry-says-her-level-143935668.html

    Katy Perry and Orlando Bloom in Los Angeles in April 2024. Last week, Perry looked back on the day she gave birth to her daughter Daisy, sharing a video on her Instagram Stories of herself sitting ...

  7. Template:Weddings - Wikipedia

    en.wikipedia.org/wiki/Template:Weddings

    This is a navigational template created using {{}}.It can be transcluded on pages by placing {{Weddings}} below the standard article appendices.. Initial visibility. This template's initial visibility currently defaults to autocollapse, meaning that if there is another collapsible item on the page (a navbox, sidebar, or table with the collapsible attribute), it is hidden apart from its title ...

  8. Axial fan design - Wikipedia

    en.wikipedia.org/wiki/Axial_fan_design

    Axial fan design. An axial fan is a type of fan that causes gas to flow through it in an axial direction, parallel to the shaft about which the blades rotate. The flow is axial at entry and exit. The fan is designed to produce a pressure difference, and hence force, to cause a flow through the fan. Factors which determine the performance of the ...

  9. Tuanshan - Wikipedia

    en.wikipedia.org/wiki/Tuanshan

    Chinese brides also used a type of moon-shaped tuanshan in traditional Chinese wedding called queshan. [6] The ceremonial rite of queshan was an important ceremony in Chinese wedding: the bride would hold it in front of her face to hide her shyness, to remain mysterious, and as a way to exorcise evil spirits. [6]

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