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The Jeans mass is named after the British physicist Sir James Jeans, who considered the process of gravitational collapse within a gaseous cloud. He was able to show that, under appropriate conditions, a cloud, or part of one, would become unstable and begin to collapse when it lacked sufficient gaseous pressure support to balance the force of gravity.
Faraday instability: Vibrating fluid surfaces: M. Faraday: Farley–Buneman instability: Plasma instability: Donald T. Farley and Oscar Buneman: Görtler instability: Stability of flow along a concave boundary layer: H. Görtler: Holmboe instability: Stratified shear flows: Jørgen Holmboe: Jeans instability: Stability of interstellar gas ...
In organic synthesis, PPTS is used as a weakly acidic catalyst, providing an organic soluble source of pyridinium (C 5 H 5 NH +) ions.For example, PPTS is used to deprotect silyl ethers or tetrahydropyranyl ethers when a substrate is unstable to stronger acid catalysts.
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PPTS may refer to: Palestine Pilgrims' Text Society, a Victorian academic society; Pulsed plasma thrusters, a type of spacecraft propulsion; Prospective Piloted Transport System, a Russian spacecraft; Pyridinium p-toluenesulfonate, a chemical reagent; Point perfect transcription services
The Jeans equations are a set of partial differential equations that describe the motion of a collection of stars in a gravitational field. The Jeans equations relate the second-order velocity moments to the density and potential of a stellar system for systems without collision.
The world has entered an era of increasing instability as countries around the globe boost military spending in response to Russia’s invasion of Ukraine, the Hamas attack on Israel and China’s ...
Hydrodynamics simulation of the Rayleigh–Taylor instability [3] Unstable flow structure generated from the collision of two impinging jets.. Fluid instabilities occur in liquids, gases and plasmas, and are often characterized by the shape that form; they are studied in fluid dynamics and magnetohydrodynamics.