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  1. 資料時間:2024/07/01

  2. In the 1970s, the ground-based OMEGA navigation system, based on phase comparison of signal transmission from pairs of stations, [ 24] became the first worldwide radio navigation system. Limitations of these systems drove the need for a more universal navigation solution with greater accuracy.

  3. Conformally Invariant Quantum Fields (1986) Doctoral advisor. Irving Segal. Doctoral students. Alissa Crans. John Carlos Baez ( / ˈbaɪ.ɛz /; [ 2] born June 12, 1961) is an American mathematical physicist and a professor of mathematics at the University of California, Riverside (UCR) [ 3] in Riverside, California.

  4. Sagnac interferometer. Quantum Experiments at Space Scale ( QUESS; Chinese: 量子 科学 实验 卫星; pinyin: Liàngzǐ kēxué shíyàn wèixīng; lit. 'Quantum Science Experiment Satellite'), is a Chinese research project in the field of quantum physics. QUESS was launched on 15 August 2016. The project consists of the satellite Micius, or ...

  5. John Woods (logician) John Hayden Woods FRSC (16 March 1937 – 15 August 2024) was a Canadian logician and philosopher. He latterly held the position of Director of the Abductive Systems Group at the University of British Columbia (UBC) and was The UBC Honorary Professor of Logic. He was also affiliated with the Group on Logic, Information and ...

  6. Sexual reproduction. Sexual reproduction occurs in two fundamentally different ways. This is by outcrossing ( heterothallic sex), in which two distinct individuals contribute nuclei, or by homothallic sex or self-fertilization (selfing) in which both nuclei are derived from the same individual.

  7. On July 1, 1901, Lieutenant Colonel James Anderson Buchanan took command of the regiment. He was later promoted to colonel on July 21, 1902, and to brigadier general in 1905. Buchanan served in Puerto Rico from 1898 to 1903 and Fort Buchanan was named after him.

  8. Derivations and structure algebra. A derivation of a Jordan algebra A is an endomorphism D of A such that D ( xy) = D ( x) y + xD ( y ). The derivations form a Lie algebra der ( A ). The Jordan identity implies that if x and y are elements of A, then the endomorphism sending z to x ( yz )− y ( xz) is a derivation.

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