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Vor einem Tag · Relativistic quantum physics and quantum field theory. The one-particle Schrödinger equation described above is valid essentially in the nonrelativistic domain. For one reason, it is essentially invariant under Galilean transformations, which form the symmetry group of Newtonian dynamics.
Vor 39 Minuten · Footnote 3 By the end of the nineteenth century, mechanical explanations had been extended to heat, sound, and light, and in the twentieth century, even to gravity and quantum theory. The chief danger for the historian of mechanics, then, is to assume the modern scope of mechanics as a Platonic ideal, and then to accumulate evidence from the past for its progressive revelation.
Vor einem Tag · History of gravitational theory. In physics, theories of gravitation postulate mechanisms of interaction governing the movements of bodies with mass. There have been numerous theories of gravitation since ancient times. The first extant sources discussing such theories are found in ancient Greek philosophy.
Vor einem Tag · History Early history. The hypothesis of dark matter has an elaborate history. In the appendices of the book Baltimore lectures on molecular dynamics and the wave theory of light where the main text was based on a series of lectures given in 1884, Lord Kelvin discussed the potential number of stars around the Sun from the observed velocity dispersion of the stars near the Sun, assuming that ...
Vor einem Tag · Sofia Danova (1879–1946), Bulgarian teacher and philanthropist, first Bulgarian woman to graduate in mathematics. Christine Darden (born 1942), American aeronautical engineer who researches sonic booms. Geraldine Claudette Darden (born 1936), one of the first African-American women to earn a PhD in mathematics.
Vor 39 Minuten · A DIAMOND-based quantum sensor has been used to measure magnetic signals from the heart of a living animal for the first time. These weak signals, which can be used to diagnose cardiovascular disease, are usually measured with costly and bulky equipment. Xing Rong at the University of Science and Technology of China and his team developed a sensor based on a diamond about 100 micrometres thick ...
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