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  2. Tubing (recreation) - Wikipedia

    en.wikipedia.org/wiki/Tubing_(recreation)

    Tubing, also known as inner tubing, bumper tubing, towed tubing, biscuiting (in New Zealand), or kite tubing, is a recreational activity where an individual rides on top of an inner tube, either on water, snow, or through the air. The tubes themselves are also known as "donuts" or "biscuits" due to their shape.

  3. craigslist - Wikipedia

    en.wikipedia.org/wiki/Craigslist

    Craigslist headquarters in the Inner Sunset District of San Francisco prior to 2010. The site serves more than 20 billion [17] page views per month, putting it in 72nd place overall among websites worldwide and 11th place overall among websites in the United States (per Alexa.com on June 28, 2016), with more than 49.4 million unique monthly visitors in the United States alone (per Compete.com ...

  4. Pulse tube refrigerator - Wikipedia

    en.wikipedia.org/wiki/Pulse_tube_refrigerator

    In most coolers gas is compressed and expanded periodically. Well-known coolers such as the Stirling engine coolers and the popular Gifford-McMahon coolers have a displacer that ensures that the cooling (due to expansion) takes place in a different region of the machine than the heating (due to compression). Due to its clever design, the PTR ...

  5. Recuperative multi-tube cooler - Wikipedia

    en.wikipedia.org/wiki/Recuperative_multi-tube_cooler

    Recuperative multi-tube coolers essentially exist of a turning rotor which is mostly driven via chain. At the ends of the rotor are stiff cases for product feed and outlet. The rotor is supported on running treads, as it is typical for rotary drums. The interior of the rotor exists of several tubes in a revolvertype (or planetary) arrangement.

  6. Deep water source cooling - Wikipedia

    en.wikipedia.org/wiki/Deep_water_source_cooling

    It draws water from Lake Ontario through tubes extending 5 kilometres (3.1 mi) into the lake, reaching to a depth of 83 metres (272 ft) where the water is maintained at a constant 4 °C, its temperature protected by a layer of water above it, called a thermocline.

  7. Inner tubing - Wikipedia

    en.wikipedia.org/wiki/Inner_tubing

    Inner tubing may mean: Inner tube, the rubber tube within certain tires; Tubing (recreation), the act of riding an inner tube This page was last edited on 11 ...