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  2. PSA: You Need to Change the Direction of Your Ceiling Fan for ...

    www.aol.com/lifestyle/psa-change-direction...

    Conventional ceiling fans typically have a physical switch that's located in the middle of the fan near the pull string and lightbulb. Flip it either up or down to change the direction of the fan ...

  3. Which Way Should A Ceiling Fan Turn In The Winter ... - AOL

    www.aol.com/lifestyle/way-ceiling-fan-turn...

    Discover the correct direction for your ceiling fan in winter to enhance warmth and save on heating costs.

  4. Ceiling fan - Wikipedia

    en.wikipedia.org/wiki/Ceiling_fan

    Air naturally stratifies, i.e. warmer air rises to the ceiling while cooler air sinks, meaning that colder air settles near the floor where people spend most of their time. A ceiling fan, with its direction of rotation set so that the warmer air on the ceiling is pushed down along the walls and into the room, heating the cooler air.

  5. Ultrafast laser spectroscopy - Wikipedia

    en.wikipedia.org/wiki/Ultrafast_laser_spectroscopy

    Ultrafast laser spectroscopy is a category of spectroscopic techniques using ultrashort pulse lasers for the study of dynamics on extremely short time scales (attoseconds to nanoseconds). Different methods are used to examine the dynamics of charge carriers, atoms, and molecules.

  6. Pull switch - Wikipedia

    en.wikipedia.org/wiki/Pull_switch

    The most common use of a pull switch is to operate a ceiling electric light. The ceiling fan and mechanical wall fans are also appliances often operated by pull switches. Pull switches may be either two-position (open or closed) or multi-position (allowing for different fan speeds or levels of illumination). Mounted inside a pull switch, there ...

  7. Free spectral range - Wikipedia

    en.wikipedia.org/wiki/Free_spectral_range

    Free spectral range (FSR) is the spacing in optical frequency or wavelength between two successive reflected or transmitted optical intensity maxima or minima of an interferometer or diffractive optical element.

  8. Q-switching - Wikipedia

    en.wikipedia.org/wiki/Q-switching

    Q-switching, sometimes known as giant pulse formation or Q-spoiling, [1] is a technique by which a laser can be made to produce a pulsed output beam. The technique allows the production of light pulses with extremely high peak power, much higher than would be produced by the same laser if it were operating in a continuous wave (constant output) mode.

  9. Fourier-transform spectroscopy - Wikipedia

    en.wikipedia.org/wiki/Fourier-transform_spectroscopy

    The beams interfere, allowing the temporal coherence of the light to be measured at each different time delay setting, effectively converting the time domain into a spatial coordinate. By making measurements of the signal at many discrete positions of the movable mirror, the spectrum can be reconstructed using a Fourier transform of the ...

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