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  2. Neutron detection - Wikipedia

    en.wikipedia.org/wiki/Neutron_detection

    Semiconductor detectors in which one of more constituent atoms are neutron reactive are called bulk semiconductor neutron detectors. Bulk solid-state neutron detectors can be divided into two basic categories: those that rely on the detection of charged-particle reaction products and those that rely on the detection of prompt capture gamma rays.

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  4. Capacitive displacement sensor - Wikipedia

    en.wikipedia.org/wiki/Capacitive_displacement_sensor

    The thickness of plastic materials can be measured with the material placed between two electrodes a set distance apart. These form a type of capacitor. The plastic when placed between the electrodes acts as a dielectric and displaces air (which has dielectric constant of 1, different from the plastic). Consequently, the capacitance between the ...

  5. Passive infrared sensor - Wikipedia

    en.wikipedia.org/wiki/Passive_infrared_sensor

    The plastic window reduces the chance of foreign objects (dust, insects, rain, etc.) from obscuring the sensor's field of view, damaging the mechanism, and/or causing false alarms. The window may be used as a filter, to limit the wavelengths to 8-14 micrometres, which is closest to the infrared radiation emitted by humans.

  6. Capacitive sensing - Wikipedia

    en.wikipedia.org/wiki/Capacitive_sensing

    The stray capacitance can be held relatively constant by shielding the (high impedance) capacitance signal and then connecting the shield to (a low impedance) ground reference. Also, to minimize the unwanted effects of stray capacitance, it is good practice to locate the sensing electronics as near the sensor electrodes as possible.

  7. NYT ‘Connections’ Hints and Answers Today, Saturday, December 14

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  8. Candy Canes Are Everywhere on Christmas—But Why Is That? - AOL

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    Candy canes are a peppermint treat long associated with Christmas. Learn their history, including why they were first made with red and white stripes.

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    This popular vitamin C serum is on sale for just $10: '60 is the new 40' AOL. ... 25 hostess gifts from Walmart are way better than a bottle of wine. See all deals. In Other News.

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