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  2. Internally rifled boiler tubes - Wikipedia

    en.wikipedia.org/wiki/Internally_rifled_boiler_tubes

    Internally rifled boiler tubes are used to evaporate water into steam inside boilers of thermal power plants. Because of their internally rifled shape, they are more efficient. The boiling crisis takes place later, thus allowing for greater heat transfer between the pipe and the fluid inside the pipe.

  3. Beam tetrode - Wikipedia

    en.wikipedia.org/wiki/Beam_tetrode

    A beam tetrode, sometimes called a beam power tube, is a type of vacuum tube or thermionic valve that has two grids and forms the electron stream from the cathode into multiple partially collimated beams to produce a low potential space charge region between the anode and screen grid to return anode secondary emission electrons to the anode ...

  4. Fluorescent-lamp formats - Wikipedia

    en.wikipedia.org/wiki/Fluorescent-lamp_formats

    Many more tube ratings exist, often country-specific. The Nominal Length may not exactly match any measured dimension of the tube. For some tube sizes, the nominal length (in feet) is the required spacing between centers of the lighting fixtures to create a continuous run, so the tubes are a little shorter than the nominal length.

  5. 'Incredibly dangerous': How to prepare for incoming ice storm

    www.aol.com/incredibly-dangerous-prepare...

    February 4, 2025 at 12:04 PM The first in a series of winter storms is poised to spread a nasty mix of frozen precipitation across portions of the central and eastern U.S. this week.

  6. List of Mullard–Philips vacuum tubes - Wikipedia

    en.wikipedia.org/wiki/List_of_Mullard–Philips...

    This is a list of European Mullard–Philips vacuum tubes and their American equivalents. Most post-war European thermionic valve (vacuum tube) manufacturers have used the Mullard–Philips tube designation naming scheme.

  7. Trump refuses to rule out military force to acquire Greenland ...

    www.aol.com/news/trump-refuses-rule-military...

    Trump said he is not considering military force to annex Canada ‒ whose longtime prime minister, Justin Trudeau resigned Monday ‒ but said he hopes the U.S. can acquire the neighboring country ...