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T wave is considered flat when the wave varies from -1.0 mm to + 1.0 mm in height. Hypokalemia or digitalis therapy can cause flattened T wave with a prominent U wave. As hypokalemia progressively worsens, the T wave becomes more flattened while the U wave becomes more prominent, with progressively deeper ST segment depression.
The U band is a range of frequencies contained in the microwave region of the electromagnetic spectrum. Common usage places this range between 40 and 60 GHz , but may vary depending on the source using the term.
This is a list of science and science-related occupations, which include various scientific occupations and careers based upon scientific research disciplines and explorers. A medical laboratory scientist at the National Institutes of Health preparing DNA samples
Two of these equations predicted the possibility and behavior of waves in the field. Analyzing the speed of these theoretical waves, Maxwell realized that they must travel at a speed that was about the known speed of light. This startling coincidence in value led Maxwell to make the inference that light itself is a type of electromagnetic wave.
The W band of the microwave part of the electromagnetic spectrum ranges from 75 to 110 GHz, wavelength ≈2.7–4 mm. It sits above the U.S. IEEE -designated V band (40–75 GHz) in frequency, and overlaps the NATO designated M band (60–100 GHz).
a the wave amplitude of each frequency component in metres, k 1 and k 2 the wave number of each wave component, in radians per metre, and; ω 1 and ω 2 the angular frequency of each wave component, in radians per second. Both ω 1 and k 1, as well as ω 2 and k 2, have to satisfy the dispersion relation:
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As frequency increases above 30 GHz (the beginning of the millimeter wave band), atmospheric gases absorb increasing amounts of power, so the power in a beam of radio waves decreases exponentially with distance from the transmitting antenna. At 30 GHz, useful communication is limited to about 1 km, but as frequency increases the range at which ...