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The earliest version of the CRT was known as the "Braun tube", invented by the German physicist Ferdinand Braun in 1897. [13] It was a cold-cathode diode, a modification of the Crookes tube with a phosphor-coated screen. Braun was the first to conceive the use of a CRT as a display device. [14] The Braun tube became the foundation of 20th ...
Braun's audio equipment and the high-quality "D"-series (D25–D47) 35mm slide projectors from this period are some of the better examples of Functionalist design. Another icon of modern design, but less well known, is the LE1 electrostatic loudspeaker unit (for which technological aspects were licensed from the British company QUAD).
2 O) 2 Mn 5 O 10. Braun did investigations which ruled out several possible causes of asymmetric conduction, such as electrolytic action and some types of thermoelectric effects. [42] Thirty years after these discoveries, after Bose's experiments, Braun began experimenting with his crystalline contacts as radio wave detectors.
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Vitamin D supplements, with or without calcium, are important for overall health. However, vitamin D supplements have no effect on preventing falls or fractures in older adults, according to the U ...
This undated photo released by the New York Police Department shows a suspect in the fatal shooting of UnitedHealthcare CEO Brian Thompson on Dec. 4, 2024, in a taxi.
Or at least 75 to 150 minutes (one hour 15 minutes to 2.5 hours) of vigorous-intensity aerobic exercise a week. Or you can do a combo of the two. This might seem like a lot — and it kind of is.
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