Langevin, Paul

Langevin, Paul (1872-1946) French plysicist in Paris in 1926 he became director of the Ecole de Physique et Chimie. 

Langevin Paul, 9, 371 Langreth David C., 715 Laplace Pierre, 191 Larsson Peter, 103 Lattes Cesare G., 152... 

Page, M. I., and Jencks, W. P., entropic hypothesis of enzyme catalysis, 224-225 Papain, Cys-His proton transfer in, 140-143 Pauling, Linus, view of enzyme catalysis, 208 PDLD model, see Protein dipoles-Langevin dipoles model (PDLD)... 

The function (a) is known as the Langevin function, after Paul Langevin, French physicist (1872-1946). The magnetic susceptibility of a paramagnetic substance can be expressed as (jim(B/kT). where fim is the magnetic moment, (S the magnetic flux, k the B and T die absolute temperature. 

He cites work including Paul Langevin s on the theory of the Kerr Phenomenon. He also calculates that the average calculated dipole length is on the order of tenths of an angstrom, compatible with the estimated distance of an angstrom between atoms, e g., in hydrogen chloride (602). 

Edmond Bauer, 22, in Henri Laugier et al., Hommage national a Paul Langevin et Jean Perrin (Paris Orleans, 1948). 

Weber in 1854 had attributed paramagnetism to the orientation of little permanent magnets in the substance (and diamagnetism to induced currents, as discussed above). A quantitative treatment was developed by Paul Langevin in 1895, by application of the Boltzmann principle. The theory is the same as for the orientation of electric dipoles (see App. IX). It leads to the equation... 

For a first time the theme selected for the 8th Conference was Cosmic Ray and Nuclear Physics, but a long period of illness of the President of the Scientific Committee, Paul Langevin, imposed a first adjournment. Later it was decided that the conference would deal with the problems of elementary particles and their mutual interactions and that it would be held in October 1939. Even the list of speakers was prepared but World War II started on 3 September 1939 and the conference was postponed to an indefinite date. 

Laboratory for Neutron Scattering, ETH Zurich Paul Scherrer Institute, CH-5232 Villigen Switzerland and Institut Laue-Langevin, 38042 Grenoble, France... 

Equation 8.7 is the equation of a line passing through the origin (zero intercept) with x plotted on the ordinate and 1 /T plotted on the abscissa. The slope of the line is C, the Curie constant. Equivalently, a plot of 1 /x versus T yields a straight line with slope 1/C (Fig. 8.3b). For the case of classical mechanics, Paul Langevin (1872-1946) later showed that the exact form of the equation for the magnetic susceptibility, in fields insufficient to cause saturation, is ... 

The continuous limit of a simple random walk model leads to a stochastic dynamic equation, first discussed in physics in the context of diffusion by Paul Langevin. The random force in the Langevin equation [44], for a simple dichotomous process with memory, leads to a diffusion variable that scales in time and has a Gaussian probability density. A long-time memory in such a random force is shown to produce a non-Gaussian probability density for the system response, but one that still scales. 

Because radium was present in such a tiny amount, the Curies were at first unable to isolate pure samples, but had to settle for the chloride salt, RaCl2. Much to the Curies delight, they found that radium chloride glowed in the dark, just like phosphorus. The Curies took such joy in their discovery that they would entertain their scientific friends— among them Paul Langevin (1872-1946) and Jean-Baptiste Perrin (1870-1942)—by inviting them to the Curies apartment just to sit in the dark and watch their sample of radium chloride glow. 

French physicist Paul Langevin is born on January 23 in Paris, France. 

We underline that the usage of stochastic methods in many particle physics was initiated by Albert Einstein in 1905 working on heavy particles immersed in liquids and which are thus permanently agitated by the molecules of the surrounding liquid. Whereas Einstein formulated an evolution law for the probability P(r, t) to And the particle in a certain position r at time t Paul Langevin formulated a stochastic equation of motion, i.e. a stochastic differential equation for the time dependent position r t) itself. 

He was 32 when he presented his doctoral dissertation, which embarrassed his supervisor, Paul Langevin. The thesis, on the wave nature of all particles, was so revolutionary that only a positive opinion from Einstein, who was asked by Langevin to take a look of the dissertation, convinced the doctoral committee. Only five years later (in 1929), Louis de Broglie received the Nobel Prize for his discovery of the wave nature of eiectrons"... 

Paul Langevin (1872-1946), French physicist and professor at the College de France. His main achievements are in the theory of magnetism and in relativity theory. His Ph.D. student Louis de Broglie made a breakthrough by attributing wave properties to particles in quantum theory. 

The theoretical explanation of Brownian motion was derived independently by Einstein [3] and Smoluchowski around the same year. Later, Paul Langevin [4] derived the same expression through a completely different approach. Einstein s derivation will be discussed in the following Section. 

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