Poisson, Simeon Denis

Poisson, Simeon Denis (1781-1840) was a French mathematician. He was more suited to mathematics than medicine because of his clumsiness. This was not an impediment for a mathematician In 1837 he published a paper on probability, which described the Poisson distribution. During his career Poisson published more than 300 mathematical works and was reported to have said Life is good for only two things, discovering mathematics and teaching mathematics. ... 

Ibid., 240 Elizabeth Garber, "Simeon-Denis Poisson Mathematics versus Physics in Early Nineteenth-Century France," in Beyond History of Science Essays in Honor of Robert E. Schofield (Lehigh University Press, 1990). Also, J. M. Bos, "Mathematics and Rational Mechanics," 327355, in Rousseau and Porter, The Ferment of Knowledge, esp. pp. 329, 334335, 348. 

David Leonard Chapman (1869-1958). 35 Simeon Denis Poisson (1781-1840). 

In Eq. 10.18, v is the Poisson s ratio, named after French mathematician Simeon-Denis Poisson (1781-1840). Poisson s ratio is the dimensionless ratio of relative diameter change (lateral contraction per unit breadth) to relative length change (longitudinal... 

Since distributions describing a discrete random variable may be less familiar than those routinely used for describing a continuous random variable, a presentation of basic theory is warranted. Count data, expressed as the number of occurrences during a specified time interval, often can be characterized by a discrete probability distribution known as the Poisson distribution, named after Simeon-Denis Poisson who first published it in 1838. For a Poisson-distributed random variable, Y, with mean X, the probability of exactly y events, for y = 0,1, 2,..., is given by Eq. (27.1). Representative Poisson distributions are presented for A = 1, 3, and 9 in Figure 27.3. 

The law which applies in problems of this kind is the Poisson distribution law, developed by the French mathematician Simeon Denis Poisson (1781-1840). According to this law, if the mean value is m counts, the probability of finding a value of x counts is... 

Simeon Denis Poisson, bom Jun. 21, 1781, in Pithiviers, France, died Apr. 25, 1840, in Sceaux, France. 

Mobile ions of the Gouy layer are distributed under the influence of Brownian motion forces and electrostatic field of the interface intrinsic charge. Brownian motion forces are distributed uniformly and the forces of electrostatic field increase toward the charged surface, according to Simeon Denis Poisson (1781-1840) equation. In the description of adsorption-desorption processes on a flat surface it is possible to consider a xmi-form field only along the x coordinate. In this case the Poisson equation has the format ... 

Underwater acoustics commenced with theories developed by the nineteenth-century mathematician Simeon-Denis Poisson, but further development had to await the invention of underwater transducers in the next century. 

Important theoretical contributions to the study of fluid surfaces were made by Carl Friedrich Gauss in 1830 and by Simeon Denis Poisson in 1831. Gauss re-derived the Laplace-Young equation by examining the energy of the fluid surface and obtained an expression for the angle of contact at the boundary. Poisson introduced the concept that the density of the fluid in the region of the surface was different from that of the bulk fluid. 

Poisson s ratio The ratio of the lateral strain to the longitudinal strain in a material held under tension. When a sample of material is stretched (or squeezed), there is a contraction (or extension) in the direction perpendicular to the applied load. Poisson s ratio is the ratio between these two quantities. The value lies between -1.0 and 0.5. It was introduced by French mathematician and physicist Simeon-Denis Poisson (1781-1840). 

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