perturbation function
61Soliton (optics) — In optics, the term soliton is used to refer to any optical field that does not change during propagation because of a delicate balance between nonlinear and linear effects in the medium. There are two main kinds of solitons: spatial solitons:… …
62Statistical coupling analysis — or SCA is a technique used in bioinformatics to measure covariation between pairs of amino acids in a protein multiple sequence alignment (MSA). More specifically, it quantifies how much the amino acid distribution at some position i changes upon …
63Fibromyalgie — Classification internationale des maladies CIM 10 : M79.7 (ICD9 = 729.1) La fibromyalgie, ou syndrome polyalgique idiopathique diffus (SPID), est une maladie caractérisée par un état douloureux musculaire chronique (myalgies diffuses) étendu ou… …
64Formation des structures — La formation des structures est le processus primordial de genèse des structures observables dans le ciel actuel à partir d un état dense, chaud et surtout quasiment uniforme[1]. Comprendre ce passage de l homogène et uniforme à une grande… …
65Scalar field theory — In theoretical physics, scalar field theory can refer to a classical or quantum theory of scalar fields. A field which is invariant under any Lorentz transformation is called a scalar , in contrast to a vector or tensor field. The quanta of the… …
66metamorphic rock — Any of a class of rocks that result from the alteration of preexisting rocks in response to changing geological conditions, including variations in temperature, pressure, and mechanical stress. The preexisting rocks may be igneous, sedimentary,… …
67physical science, principles of — Introduction the procedures and concepts employed by those who study the inorganic world. physical science, like all the natural sciences, is concerned with describing and relating to one another those experiences of the surrounding… …
68Mathematical formulation of quantum mechanics — Quantum mechanics Uncertainty principle …
69Potential flow — streamlines around a NACA 0012 airfoil at 11° angle of attack, with upper and lower streamtubes identified. In fluid dynamics, potential flow describes the velocity field as the gradient of a scalar function: the velocity potential. As a result,… …
70Noether's theorem — This article discusses Emmy Noether s first theorem, which derives conserved quantities from symmetries. For her related theorem on infinite dimensional Lie algebras and differential equations, see Noether s second theorem. For her unrelated… …
