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Chern, Shiing-Shen

(Encyclopedia)Chern, Shiing-Shen, 1911–2004, Chinese-American mathematician, b. Kashing (now Jiaxing), China, D.Sc. Hamburg, 1936. While undertaking graduate studies in China (1932–34), Chern developed what bec...

Turnverein

(Encyclopedia)Turnverein to͝ornˈfərīn [key], society of a type originated in Prussia by Friedrich Ludwig Jahn. The first hall of such a society was built in 1811 on the Hasenheide athletic grounds, near Berlin....

Osterman, Andrei Ivanovich, Count

(Encyclopedia)Osterman, Andrei Ivanovich, Count əndrāˈ ēväˈnəvĭch əstyĭrmänˈ [key], 1686–1747, Russian statesman, b. Germany. His original name was Heinrich Johann Friedrich Ostermann. Under Czar Pete...

Menger, Carl

(Encyclopedia)Menger, Carl kärl mĕngˈər [key], 1840–1921, Austrian economist, a founder of the Austrian school of economics. He was professor of economics at the Univ. of Vienna from 1873 until 1903, when he ...

Riemann, Bernhard

(Encyclopedia)Riemann, Bernhard (Georg Friedrich Bernhard Riemann) gāˈôrk frēˈdrĭkh bĕrnˈhärt rēˈmän [key], 1826–66, German mathematician. He studied at the universities of Göttingen and Berlin and w...

X-ray crystallography

(Encyclopedia)X-ray crystallography, the study of crystal structures through X-ray diffraction techniques. When an X-ray beam bombards a crystalline lattice in a given orientation, the beam is scattered in a defini...

Sturm und Drang

(Encyclopedia)Sturm und Drang shto͝orm o͝ont dräng [key] or Storm and Stress, movement in German literature that flourished from c.1770 to c.1784. It takes its name from a play by F. M. von Klinger, Wirrwarr; od...

yttrium

(Encyclopedia)yttrium ĭtˈrēəm [key] [for Ytterby, a town in Sweden], metallic chemical element; symbol Y; at. no. 39; at. wt. 88.90585; m.p. about 1,522℃; b.p. 3,338℃; sp. gr. about 4.45; valence +3. Yttriu...

hardness

(Encyclopedia)hardness, property of matter commonly described as the resistance of a substance to being scratched by another substance. The degree of hardness is relative, different substances being compared with o...

Göttingen

(Encyclopedia)Göttingen götˈĭng-ən [key], city, Lower Saxony, central Germany, on the Leine River. It is ...