Particle
41Particle image velocimetry — (PIV) is an optical method used to measure velocities and related properties in fluids. The fluid is seeded with particles which, for the purposes of PIV, are generally assumed to faithfully follow the flow dynamics. It is the motion of these… …
42Particle displacement — or particle amplitude (represented in mathematics by the lower case Greek letter xi;) is a measurement of distance (in metres) of the movement of a particle in a medium as it transmits a wave. In most cases this is a longitudinal wave of pressure …
43Particle Mesh — (PM) is a computational method for determining the gravity forces in a system of particles. These particles could refer to atoms, stars, or fluid components and so the method is applicable to many fields, including molecular dynamics and… …
44Particle Man — is a song by the band They Might Be Giants. It can be found on their 1990 release, Flood . It is about four different beings, each referred to as a man : Particle Man, a microscopic being whose attributes are deemed not important by the song;… …
45Particle size — *particle size (general) provides general definitions of the particle size notion. *particle size (grain size) provides specific details for particle size of soils, powders, gravel, etc. *particle size distribution …
46Particle astrophysics — can be defined as the border between particle physics and cosmology (for example, the physics of the early universe, baryogenesis, cosmological nucleosynthesis, dark matter, monopoles, the origin of structure), particle and stellar physics (for… …
47Particle physics in cosmology — Particle physics, which deals with the interactions of elementary particles at high energies, is an important component of cosmological models of the early universe, when the universe was dominated by radiation and its average energy density was… …
48Particle-induced X-ray emission — or proton induced X ray emission (PIXE) is a technique used in the determining of the elemental make up of a material or sample. When a material is exposed to an ion beam, atomic interactions occur that give off EM radiation of wavelengths in the …
49Particle Systems — Ltd. was a computer game developer based in Sheffield, England. The company was founded by Glyn Williams and Michael Powell. Games developed by Particle Systems include Independence War and its sequel . The company was working on tactical combat… …
50Particle accelerator — Par ti*cle ac*cel er*a*tor, n. (Physics) A large and expensive scientific instrument used by physicists to accelerate elementary particles (such as protons or electrons) to speeds near that of light, for the purpose of investigating the… …
