Yu Zhenwu was a pilot and general of the Chinese People's Liberation Army Air Force (PLAAF). As one of China's first test pilots, he conducted the 1958 maiden flight of the Shenyang JJ-1, China's first indigenously developed jet aircraft. He later served as commander of the Guangzhou Military Region Air Force from 1982 to 1985, deputy commander of the PLAAF from 1985 to 1994, and commander of the PLAAF from 1994 to 1996.
"}{"fact":"The first cat show was in 1871 at the Crystal Palace in London.","length":63}
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{"type":"standard","title":"Vacuum expectation value","displaytitle":"Vacuum expectation value","namespace":{"id":0,"text":""},"wikibase_item":"Q1137397","titles":{"canonical":"Vacuum_expectation_value","normalized":"Vacuum expectation value","display":"Vacuum expectation value"},"pageid":296060,"thumbnail":{"source":"https://upload.wikimedia.org/wikipedia/commons/thumb/1/1f/Feynmann_Diagram_Gluon_Radiation.svg/330px-Feynmann_Diagram_Gluon_Radiation.svg.png","width":320,"height":200},"originalimage":{"source":"https://upload.wikimedia.org/wikipedia/commons/thumb/1/1f/Feynmann_Diagram_Gluon_Radiation.svg/400px-Feynmann_Diagram_Gluon_Radiation.svg.png","width":400,"height":250},"lang":"en","dir":"ltr","revision":"1269040464","tid":"86a2a67b-d118-11ef-b37c-6bfc89b947ce","timestamp":"2025-01-12T19:07:54Z","description":"Type of operator expectation value","description_source":"local","content_urls":{"desktop":{"page":"https://en.wikipedia.org/wiki/Vacuum_expectation_value","revisions":"https://en.wikipedia.org/wiki/Vacuum_expectation_value?action=history","edit":"https://en.wikipedia.org/wiki/Vacuum_expectation_value?action=edit","talk":"https://en.wikipedia.org/wiki/Talk:Vacuum_expectation_value"},"mobile":{"page":"https://en.m.wikipedia.org/wiki/Vacuum_expectation_value","revisions":"https://en.m.wikipedia.org/wiki/Special:History/Vacuum_expectation_value","edit":"https://en.m.wikipedia.org/wiki/Vacuum_expectation_value?action=edit","talk":"https://en.m.wikipedia.org/wiki/Talk:Vacuum_expectation_value"}},"extract":"In quantum field theory the vacuum expectation value of an operator is its average or expectation value in the vacuum. The vacuum expectation value of an operator O is usually denoted by One of the most widely used examples of an observable physical effect that results from the vacuum expectation value of an operator is the Casimir effect.","extract_html":"
In quantum field theory the vacuum expectation value of an operator is its average or expectation value in the vacuum. The vacuum expectation value of an operator O is usually denoted by ![](\"https://wikimedia.org/api/rest_v1/media/math/render/svg/cdaf5a73f76b0e1ef50a24948bf92519ace7f2c3\")