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  2. Bell–Evans–Polanyi principle - Wikipedia

    en.wikipedia.org/wiki/Bell–Evans–Polanyi...

    In physical chemistry, the Evans–Polanyi principle (also referred to as the Bell–Evans–Polanyi principle, Brønsted–Evans–Polanyi principle, or Evans–Polanyi–Semenov principle) observes that the difference in activation energy between two reactions of the same family is proportional to the difference of their enthalpy of reaction.

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  4. Timeline of speech and voice recognition - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_speech_and...

    A team of engineers at Bell Labs, led by Homer Dudley, begins work on the Voder, the first electronic speech synthesizer. [3] 1939: March 21: Invention: Dudley is granted a patent for the Voder, US patent 2151091 A. [3] 1939: Demonstration: The Voder is demonstrated at the 1939 Golden Gate International College in Nepal. A keyboard and ...

  5. DTMF - Wikipedia

    en.wikipedia.org/wiki/DTMF

    Autovon keypads were one of the few production units to include all 16 DTMF signals. The red keys in the fourth column produce the A, B, C, and D DTMF events. Before the development of DTMF, telephone numbers were dialed by users with a loop-disconnect (LD) signaling, more commonly known as pulse dialing (dial pulse, DP) in the United States.

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  7. Bell's mania - Wikipedia

    en.wikipedia.org/wiki/Bell's_mania

    Bell's Mania is a syndrome with unexplained etiology which was first explained by American psychiatrist Luther Bell in the 1850s after observing institutionalized psychiatric patients. The first clinical reports and descriptions of people with acute exhaustive mania and delirium were provided by a few psychiatrists in the United States of ...

  8. Bell - Wikipedia

    en.wikipedia.org/wiki/Bell

    The bell itself weighs 66,000 pounds (30,000 kg); with clapper and supports. The total weight which swings when the bell is rung is 89,390 pounds (40,550 kg). The largest Bell of the People's Salvation Cathedral is the largest free-swinging church bell in the world, surpassing the Petersglocke of Cologne Cathedral.

  9. Bell MTS - Wikipedia

    en.wikipedia.org/wiki/Bell_MTS

    Bell MTS Inc. (formerly Manitoba Telecom Services) is a subsidiary of BCE Inc. that operates telecommunications services in Manitoba. Originally established as Manitoba Government Telephones after the Government of Manitoba purchased the Manitoba assets of Bell Canada, the corporation was privatized in 1996.