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In March 2023, Quizlet started to incorporate AI features with the release "Q-Chat", a virtual AI tutor powered by OpenAI's ChatGPT API. [27] [28] [29] Quizlet launched four additional AI powered features in August 2023 to assist with student learning. [30] [31] In July 2024, Kurt Beidler, the former co-CEO of Zwift, joined Quizlet as the new ...
[5] The first radiograph. Röntgen discovered X-rays' medical use when he made a picture of his wife's hand on a photographic plate formed due to X-rays. The photograph of his wife's hand was the first ever photograph of a human body part using X-rays. When she saw the picture, she said, "I have seen my death." [5]
The Ulysses soft X-ray detectors consisted of 2.5-mm thick × 0.5 cm 2 area Si surface barrier detectors. A 100 mg/cm 2 beryllium foil front window rejected the low energy X-rays and defined a conical FOV of 75° (half-angle). These detectors were passively cooled and operate in the temperature range −35 to −55 °C.
The principal ray or chief ray (sometimes known as the b ray) in an optical system is the meridional ray that starts at an edge of an object and passes through the center of the aperture stop. [5] [8] [7] The distance between the chief ray (or an extension of it for a virtual image) and the optical axis at an image location defines the size of ...
Many microfocus X-ray sources operate with focus spots in the range 5-20 μm, but in the extreme cases spots smaller than 1 μm may be produced. [citation needed] The major drawback of solid-anode microfocus X-ray tubes is their very low operating power. To avoid melting the anode, the electron-beam power density must be below a maximum value.
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Example profiles of thermonuclear bursts observed from X-ray bursters by satellite-based X-ray telescopes, demonstrating the range of durations and intensities. [1] From top to bottom, the figure shows an intermediate-duration burst observed with BeppoSAX/WFC from M15 X-2; a mixed H/He burst observed with INTEGRAL/JEM-X from GS 1826−24, and an H-deficient burst observed with RXTE/PCA from 4U ...
OSO 6 (OSO G) 9 August 1969 7 March 1981 [15] Observed three instances of hard X-ray coincidences with gamma ray bursts. [16] OSO 7 (OSO H) 29 September 1971: 8 July 1974 [17] Observed solar flares in the gamma ray spectrum. Collected data allowed for identification of Vela X-1 as a High-mass X-ray binary. [18] [19] OSO 8 (OSO I) 21 June 1975 8 ...