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Albert Einstein (14 March 1879 – 18 April 1955) was a Germanborn theoretical physicist. He is best known for his theory of relativity and specifically mass–energy equivalence, expressed by the equation E = mc2. Einstein received the 1921 Nobel Prize in Physics "for his services to Theoretical Physics, and especially for his discovery of the law of the photoelectric effect."
Einstein's many contributions to physics include his special theory of relativity, which reconciled mechanics with electromagnetism, and his general theory of relativity, a new theory of gravitation which added the principle of equivalence to the principle of relativity. His other contributions include the founding of relativistic cosmology with a cosmological constant, the first postNewtonian expansions for the perihelion advance of mercury and framedragging, the deflection of light by gravity and gravitational lensing, an explanation for capillary action, the first fluctuation dissipation theorem which explaned the Brownian movement of molecules, the photon theory and waveparticle duality from the thermodynamic properties of light, the quantum theory of atomic motion in solids, zero point energy, the semiclassical version of the Schrodinger equation, relations for atomic transition probabilities which predicted stimulated emission, the quantum theory of a monatomic gas which predicted BoseEinstein condensation, the EPR paradox, and a program for a unified field theory by the geometrization of physics.
Einstein published over 300 scientific works and over 150 nonscientific works. In 1999 Time magazine named him the "Person of the Century", and according to Einstein biographer Don Howard, "to the scientifically literate and the public at large, Einstein is synonymous with genius.
Archimedes of Syracuse (c. 287 BC – c. 212 BC) was a Greek mathematician, physicist, engineer, inventor, and astronomer. Although few details of his life are known, he is regarded as one of the leading scientists in classical antiquity. Among his advances in physics are the foundations of hydrostatics, statics and the explanation of the principle of the lever. He is credited with designing innovative machines, including siege engines and the screw pump that bears his name. Modern experiments have tested claims that Archimedes designed machines capable of lifting attacking ships out of the water and setting ships on fire using an array of mirrors.
Archimedes is generally considered to be the greatest mathematician of antiquity and one of the greatest of all time. He used the method of exhaustion to calculate the area under the arc of a parabola with the summation of an infinite series, and gave a remarkably accurate approximation of pi. He also defined the spiral bearing his name, formulas for the volumes of surfaces of revolution and an ingenious system for expressing very large numbers.
Archimedes died during the Siege of Syracuse when he was killed by a Roman soldier despite orders that he should not be harmed. Cicero describes visiting the tomb of Archimedes, which was surmounted by a sphere inscribed within a cylinder. Archimedes had proven that the sphere has two thirds of the volume and surface area of the cylinder (including the bases of the latter), and regarded this as the greatest of his mathematical achievements.
Unlike his inventions, the mathematical writings of Archimedes were little known in antiquity. Mathematicians from Alexandria read and quoted him, but the first comprehensive compilation was not made until c. AD 530 by Isidore of Miletus, while commentaries on the works of Archimedes written by Eutocius in the sixth century AD opened them to wider readership for the first time. The relatively few copies of Archimedes' written work that survived through the Middle Ages were an influential source of ideas for scientists during the Renaissance, while the discovery in 1906 of previously unknown works by Archimedes in the Archimedes Palimpsest has provided new insights into how he obtained mathematical results
Abū Nasr alFārābi known in the West as Alpharabius (c. 872 – between 14 December 950 and 12 January 951), was a Muslim polymath and one of the greatest scientists and philosophers of Persia and the Islamic world in his time. He was also a cosmologist, logician, musician, psychologist and sociologist.
Biography
The existing variations in the basic accounts of alFarabi's origins and pedigree indicate that they were not recorded during his lifetime or soon thereafter by anyone with concrete information, but were based on hearsay or guesses (as is the case with other contemporaries of alFarabi). But what is known with certainty is that after finishing his early school years in Farab and Bukhara, Farabi moved to Baghdad in 901 to pursue higher studies. He studied under a Nestorian Christian cleric Yuhanna ibnHaylan in Harran who abandoned lay interests and engaged in his ecclesiastical duties, and he remained in Baghdad for more than 40 years and acquired mastery over several languages and fields of knowledge. He left Baghdad in 941 and went to Aleppo. There, he was supported and glorified by Saif adDaula, the Hamdanid ruler of Syria. He had some other journeys and traveled to Cairo[ Finally Farabi died in Damascus sometime between 14 December 950 and 12 January 951
Sir Alfred Charles Bernard Lovell OBE PhD FRS (born 31 August 1913 [1]) is an English physicist and radio astronomer. He was the first Director of Jodrell Bank Observatory, from 1945 to 1980.
Career
Born in Oldland Common, Bristol, he studied physics at the University of Bristol, obtaining a Ph.D. in 1936. He worked in the cosmic ray research team at the University of Manchester until the outbreak of World War II, during which he worked for the Telecommunications Research Establishment (TRE) developing radar systems to be installed in aircraft, among them H2S, for which he received an OBE in 1946.
He attempted to continue cosmic ray work with an exmilitary radar unit and following interference from trams on Manchester's Oxford Road moved to Jodrell Bank Observatory, near Goostrey in Cheshire, an outpost of the university's botany department. He was able to show that radar echoes could be obtained from daytime meteor showers. With university funding he constructed the thenlargest steerable radio telescope in the world, which now bears his name  the Lovell Telescope. Nearly 50 years later, it remains one of the foremost radio telescopes in the world.
He was knighted in 1961 for his important contributions to the development of radio astronomy, and has a secondary school named after him in Oldland Common, Bristol, which Sir Bernard Lovell officially opened.[2] A building on the QinetiQ site in Malvern is also named after him.
The first name of the fictional scientist Bernard Quatermass, the hero of several BBC Television sciencefiction serials of the 1950s, was chosen in honour of Lovell.
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