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1. www.britannica.com › technology › VPNVPN | Definition & Facts | Britannica

   www.britannica.com › technology › VPN

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   2024年4月27日 · VPN, a private computer network deployed over a public telecommunications network, such as the Internet. A VPN typically includes one or more connected corporate intranets, or local area networks (LANs), which users at remote locations can access using a password authentication system. Data.

   • 作者: The Editors of Encyclopaedia Britannica

2. www.britannica.comEncyclopedia Britannica | Britannica

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   Explore the fact-checked online encyclopedia from Encyclopaedia Britannica with hundreds of thousands of objective articles, biographies, videos, and images from experts. For the first time in U.S. history, a former president was convicted of a crime when a Manhattan jury found former president Donald J. Trump guilty on all 34 felony charges relating to his attempts to “conceal damaging ...

3. www.britannica.com › biography › Theodore-von-KarmanTheodore von Kármán | Aerospace Engineer, ...

   www.britannica.com › biography › Theodore-von-Karman

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   • Overview
   • Early life

   Theodore von Kármán (born May 11, 1881, Budapest, Hung.—died May 6, 1963, Aachen, W.Ger.) Hungarian-born American research engineer best known for his pioneering work in the use of mathematics and the basic sciences in aeronautics and astronautics. His laboratory at the California Institute of Technology later became the National Aeronautics and Sp...

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   Von Kármán was the third of five children of Maurice and Helene von Kármán. His father, a professor at the University of Budapest and commissioner of the Ministry of Education, reformed the secondary-school system of the country and founded the Minta (Model) Gymnasium, which his son attended, as did the atomic physicists George de Hevesy and Leo Szilard. Von Kármán showed a natural mathematical facility at an early age and was well on his way to becoming a child prodigy when his father, fearing that he would become a mathematical freak, guided him toward engineering.

   On completing his undergraduate studies in 1902 at the Royal Polytechnic University in Budapest, he decided to pursue his engineering career in the academic world, which would enable him to fulfill his wide scientific interests and to practice the art of teaching, which his father had inspired in him. In later years, he was delighted when engineers to whom he had imparted his scientific attitude and methodological approach acknowledged him as their teacher.

   Between 1903 and 1906 he served on the faculty of the Polytechnic University and as consultant to the principal Hungarian engine manufacturer. The research that von Kármán conducted on the strength of materials prepared the way for important later contributions to the design of aircraft structures. He was awarded a two-year fellowship to the University of Göttingen, Germany, in order to obtain a doctor’s degree, but before completing it he went to the University of Paris. There, after an all-night party, a friend suggested that, instead of going to sleep, they watch the French aviation pioneer Henri Farman fly his machine. Farman successfully completed a 2-km (1.25-mile) course, unknowingly providing the inspiration for the young man who was to become a founder of the aeronautical and astronautical sciences.

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   Numbers and Mathematics

   Shortly thereafter, Ludwig Prandtl, a pioneer of modern fluid mechanics, invited von Kármán to return to Göttingen as his assistant on dirigible research and to complete his degree. The environment at the university was admirably suited to develop von Kármán’s talents. He responded, in particular, to the school of the eminent mathematician Felix Klein, which stressed the fullest use of mathematics and of the basic sciences in engineering to increase technological efficiency. In 1911 he made an analysis of the alternating double row of vortices behind a bluff body (one having a broad, flattened front) in a fluid stream, now famous as Kármán’s Vortex Street. The use of his analysis to explain the collapse, during high winds, of the Tacoma Narrows Bridge in the state of Washington, in the United States, in 1940, is one of the most striking examples of its value.

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4. www.britannica.com › place › JapanJapan | History, Flag, Map, Population, & Facts | Britannica

   www.britannica.com › place › Japan

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   1 天前 · Japan. Japan, island country lying off the east coast of Asia. It consists of a great string of islands in a northeast-southwest arc that stretches for approximately 1,500 miles (2,400 km) through the western North Pacific Ocean. Nearly the entire land area is taken up by the country’s four main islands; from north to south these are Hokkaido ...

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5. www.britannica.com › topic › Treaty-of-FesTreaty of Fès | Morocco [1912] | Britannica

   www.britannica.com › topic › Treaty-of-Fes

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   Other articles where Treaty of Fès is discussed: Morocco: Decline of traditional government (1830–1912): …choice but to sign the Treaty of Fez (March 30, 1912), by which Morocco became a French protectorate. In return, the French guaranteed that the status of the sultan and his successors would be maintained. Provision was also made to meet the Spanish claim for a special position in the…

6. www.britannica.com › topic › Japanese-languageJapanese language | Origin, Family, Alphabets, History, ...

   www.britannica.com › topic › Japanese-language

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   1 天前 · Japanese language, a language isolate (i.e., a language unrelated to any other language) and one of the world’s major languages, with more than 127 million speakers in the early 21st century.It is primarily spoken throughout the Japanese archipelago; there are also some 1.5 million Japanese immigrants and their descendants living abroad, mainly in North and South America, who have varying ...

7. www.britannica.com › topic › list-of-countries-1993160List of Countries in the World in Alphabetical Order | Britannica

   www.britannica.com › topic › list-of-countries-1993160

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   In World War I the Allies accepted self-determination as a peace aim. In his Fourteen Points —the essential terms for peace—U.S. Pres. Woodrow Wilson listed self-determination as an important objective for the postwar world; the result was the fragmentation of the old Austro-Hungarian and Ottoman empires and Russia’s former Baltic ...