|
Schwarzschild Solution
In Einstein's theory of general relativity, the Schwarzschild metric (also known as the Schwarzschild solution) is an exact solution to the Einstein field equations that describes the gravitational field outside a spherical mass, on the assumption that the electric charge of the mass, angular momentum of the mass, and universal cosmological constant are all zero. The solution is a useful approximation for describing slowly rotating astronomical objects such as many stars and planets, including Earth and the Sun. It was found by Karl Schwarzschild in 1916. According to Birkhoff's theorem, the Schwarzschild metric is the most general spherically symmetric vacuum solution of the Einstein field equations. A Schwarzschild black hole or static black hole is a black hole that has neither electric charge nor angular momentum (non-rotating). A Schwarzschild black hole is described by the Schwarzschild metric, and cannot be distinguished from any other Schwarzschild black hole except by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
German Surname
Personal names in German-speaking Europe consist of one or several given names (''Vorname'', plural ''Vornamen'') and a surname (''Nachname, Familienname''). The ''Vorname'' is usually gender-specific. A name is usually cited in the "Name order, Western order" of "given name, surname". The most common exceptions are alphabetized list of surnames, e.g. "Johann Sebastian Bach, Bach, Johann Sebastian", as well as some official documents and spoken southern German dialects. In most of this, the German conventions parallel the naming conventions in most of Western and Central Europe, including English name, English, Dutch name, Dutch, Italian name, Italian, and French name, French. There are some vestiges of a patronymic system as they survive in parts of Eastern Europe and Scandinavia, but these do not form part of the official name. Women traditionally adopted their husband's name upon marriage and would occasionally retain their maiden name by hyphenation, in a so-called ''Doppelna ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Child
A child () is a human being between the stages of childbirth, birth and puberty, or between the Development of the human body, developmental period of infancy and puberty. The term may also refer to an unborn human being. In English-speaking countries, the legal definition of ''child'' generally refers to a minor (law), minor, in this case as a person younger than the local age of majority (there are exceptions such as, for example, the consume and purchase of alcoholic beverage even after said age of majority), regardless of their physical, mental and sexual development as biological adults. Children generally have fewer Children's rights, rights and responsibilities than adults. They are generally classed as unable to make serious decisions. ''Child'' may also describe a relationship with a parent (such as sons and daughters of any age) or, Metaphor, metaphorically, an authority figure, or signify group membership in a clan, tribe, or religion; it can also signify being str ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Childe
In the Middle Ages, a childe or child (from "Young Lord") was a nobleman's son who had not yet attained knighthood or had not yet won his spurs. As a rank in chivalry it was used as a title, e.g. Child Horn in '' King Horn'', whilst a male progressed through the positions of squire and then knight. The term is now obsolete in standard English but is still well known from poetry, such as Robert Browning's '' Childe Roland to the Dark Tower Came'' and Lord Byron's ''Childe Harold's Pilgrimage''. However, the word is still used in the local Doric dialect of north-east Scotland. Here it may be directly translated as 'fellow' or 'man' into Standard English. For example, a ''working childe'' would mean a working man, while a ''dour childe'' would indicate a taciturn individual. Cultural references The term is used in application to an expected next stage in human evolution in the '' Childe Cycle'' novels by Gordon R. Dickson. Childe in Stephen King Stephen Edwin King (born S ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Shield
A shield is a piece of personal armour held in the hand, which may or may not be strapped to the wrist or forearm. Shields are used to intercept specific attacks, whether from close-ranged weaponry like spears or long ranged projectiles such as arrows. They function as means of active blocks, as well as to provide passive protection by closing one or more lines of engagement during combat. Shields vary greatly in size and shape, ranging from large panels that protect the user's whole body to small models (such as the buckler) that were intended for hand-to-hand-combat use. Shields also vary a great deal in thickness; whereas some shields were made of relatively deep, absorbent, wooden planking to protect soldiers from the impact of spears and crossbow bolts, others were thinner and lighter and designed mainly for deflecting blade strikes (like the roromaraugi or qauata). Finally, shields vary greatly in shape, ranging in roundness to angularity, proportional length and wi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Henry Schwarzschild
Henry Schwarzschild (November 2, 1925 – June 1, 1996) was an activist for civil rights and human rights. He joined the Civil Rights Movement and became involved in the fight against capital punishment. He founded the National Coalition to Abolish the Death Penalty (NCADP), served as the executive director of the Lawyer's Constitutional Defense Committee from 1964 to 1970, and headed the American Civil Liberties Union's Capital Punishment Project from 1974 to 1990. Early life Schwarzschild was born in Wiesbaden, Germany. At 13, he moved to New York City in 1939 with his parents, right before World War II. After serving in the army in the war as a member of the Counterintelligence Corps from 1944 to 1946, he went to the City College of New York, where he received a bachelor's degree and then did graduate work in political theory at Columbia University After serving in the army, it is said that he had the "appearance of a durable veteran from ancient wars, penetrating eyes intoler ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
Karl Schwarzschild
Karl Schwarzschild (; 9 October 1873 – 11 May 1916) was a German physicist and astronomer. Schwarzschild provided the first exact solution to the Einstein field equations of general relativity, for the limited case of a single spherical non-rotating mass, which he accomplished in 1915, the same year that Einstein first introduced general relativity. The Schwarzschild solution, which makes use of Schwarzschild coordinates and the Schwarzschild metric, leads to a derivation of the Schwarzschild radius, which is the size of the event horizon of a non-rotating black hole. Schwarzschild accomplished this while serving in the German army during World War I. He died the following year, possibly from the autoimmune disease pemphigus, which he developed while at the Russian front. Asteroid 837 Schwarzschilda is named in his honour, as is the large crater ''Schwarzschild'', on the far side of the Moon. Life Karl Schwarzschild was born on 9 October 1873 in Frankfurt on Main, t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] [Amazon] |
