|
actinium series
actinium series natural radioactive decay series beginning with uranium -235 (also called actinouranium) and ending with lead -207. See radioactivity .
...
Read more
|
|
Othmar Hermann Ammann
Othmar Hermann Ammann , 1879-1965, American civil engineer, b. Switzerland, grad. Federal Polytechnic Institute, Zürich, 1902. He came to the United States in 1904 and was naturalized in 1924. He served (1925-39) with the Port of New York Authority and was its director of engineers from 1937 to...
Read more
|
|
|
naturalism
naturalism in art, a tendency toward strict adherence to the physical appearance of nature and rejection of ideal forms. Artists as diverse as Velázquez , J. F. Millet , and Monet , have followed naturalistic principles.
...
Read more
|
|
uranium
uranium , radioactive metallic chemical element; symbol U; at. no. 92; at. wt. 238.0289; m.p. 1,132°C; b.p. 3,818°C; sp. gr. 19.1 at 25°C; valence +3, +4, +5, or +6.
Properties
Uranium is a hard, dense, malleable, ductile, silver-white, radioactive metal of the actinide series...
Read more
|
|
|
Adrastea
Adrastea , in astronomy, one of the 39 known moons, or natural satellites, of Jupiter .
...
Read more
|
|
|
Amalthea
Amalthea , in astronomy, one of the 39 known moons, or natural satellites, of Jupiter .
...
Read more
|
|
|
Ananke
Ananke , in astronomy, one of the 39 known moons, or natural satellites, of Jupiter .
...
Read more
|
|
|
Ariel
Ariel , in astronomy, one of the moons, or natural satellites, of Uranus .
...
Read more
|
|
|
Belinda
Belinda in astronomy, one of the natural satellites, or moons, of Uranus .
...
Read more
|
|
Bianca
Bianca in astronomy, one of the natural satellites, or moons, of Uranus .
...
Read more
|
