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  2. Oleg Losev - Wikipedia

    en.wikipedia.org/wiki/Oleg_Losev

    Employees of the Central Radio Laboratory, Leningrad, 1930. Losev is in fourth row, third from left. Oleg Vladimirovich Losev (sometimes spelled Lossev or Lossew in English; Russian: Оле́г Влади́мирович Ло́сев; 10 May 1903 – 22 January 1942) was a Russian and Soviet scientist and inventor [1] who made significant discoveries in the field of semiconductor junctions and ...

  3. Electronic mixer - Wikipedia

    en.wikipedia.org/wiki/Electronic_mixer

    Any nonlinear electronic block driven by two signals with frequencies f 1 and f 2 would generate intermodulation (mixing) products. A multiplier (which is a nonlinear device) will generate ideally only the sum and difference frequencies, whereas an arbitrary nonlinear block will also generate signals at 2·f 1-3·f 2, etc. Therefore, normal ...

  4. Light-emitting diode physics - Wikipedia

    en.wikipedia.org/wiki/Light-emitting_diode_physics

    The refractive index of silicon is 3.96 (at 590 nm), [2] while air's refractive index is 1.0002926. [3] In general, a flat-surface uncoated LED semiconductor chip emits only light that arrives nearly perpendicular to the semiconductor's surface, in a cone shape referred to as the light cone, cone of light, [4] or the escape cone. [1]

  5. Frequency mixer - Wikipedia

    en.wikipedia.org/wiki/Frequency_mixer

    Selection of a mixer type is a trade off for a particular application. [2] Mixer circuits are characterized by their properties such as conversion gain (or loss), noise figure and nonlinearity. [3] Nonlinear electronic components that are used as mixers include diodes and transistors biased near cutoff.

  6. H. J. Round - Wikipedia

    en.wikipedia.org/wiki/H._J._Round

    Recreation of the 1907 experiment by H. J. Round on the observation of electroluminescence from a point contact with a carborundum (silicon carbide) crystalIn some later experiments with cat's whisker detectors using a variety of substances, he passed current through them and noticed that some gave off light – the first known report of the effect of the light-emitting diode (LED).

  7. Outgoing FDA chief flags online weight loss drug dangers - AOL

    www.aol.com/news/outgoing-fda-chief-flags-online...

    WASHINGTON (Reuters) -Current laws and regulations are not enough to protect Americans from the risks of compounded versions of popular weight loss drugs, especially those bought online, outgoing ...

  8. Teenager accused in Wisconsin school shooting had a ...

    www.aol.com/teenager-accused-wisconsin-school...

    MADISON, Wis. — A 15-year-old girl who police say killed two people and wounded multiple others at a private Christian school in Wisconsin endured what appeared to be a tumultuous home life ...

  9. Phase detector - Wikipedia

    en.wikipedia.org/wiki/Phase_detector

    A mixer-based detector (e.g., a Schottky diode-based double-balanced mixer) provides "the ultimate in phase noise floor performance" and "in system sensitivity." since it does not create finite pulse widths at the phase detector output. [2] Another advantage of a mixer-based PD is its relative simplicity. [2]

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