Positive particles

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• positive rays — plural noun Canal rays, a stream of positively electrified particles towards the cathode of a vacuum tube (positive ray analysis the detection of gases, and determination of their molecular weights, by measuring the parabolas produced on a… …   Useful english dictionary

• Positive temperature coefficient — (PTC) refers to materials that experience an increase in electrical resistance when their temperature is raised. Materials which have useful engineering applications usually show a relatively rapid increase with temperature, i.e. a higher… …   Wikipedia

• Positive electricity — Electricity E lec*tric i*ty ([=e] l[e^]k*tr[i^]s [i^]*t[y^]), n.; pl. {Electricities} ([=e] l[e^]k*tr[i^]s [i^]*t[i^]z). [Cf. F. [ e]lectricit[ e]. See {Electric}.] 1. (Physics) a property of certain of the fundamental particles of which matter… …   The Collaborative International Dictionary of English

• List of fictional elements, materials, isotopes and atomic particles — This list contains chemical elements, materials, isotopes or (sub)atomic particle that exist primarily in works of fiction (usually fantasy or science fiction). No actual periodic elements end in ite , though many minerals have names with this… …   Wikipedia

• Weakly interacting massive particles — In astrophysics, weakly interacting massive particles, or WIMPs, are hypothetical particles serving as one possible solution to the dark matter problem. These particles interact through the weak nuclear force and gravity, and possibly through… …   Wikipedia

• List of particles — This is a list of the different types of particles, known and hypothesized. For a chronological listing of subatomic particles by discovery date, see Timeline of particle discoveries. This is a list of the different types of particles found or… …   Wikipedia

• sigma particles — plural noun (physics) Three hyperons of medium mass, having respectively positive, neutral and negative charge • • • Main Entry: ↑sigma …   Useful english dictionary

• particle accelerator — accelerator (def. 7). [1945 50] * * * Device that accelerates a beam of fast moving, electrically charged atoms (ions) or subatomic particles. Accelerators are used to study the structure of atomic nuclei (see atom) and the nature of subatomic… …   Universalium

• subatomic particle — or elementary particle Any of various self contained units of matter or energy. Discovery of the electron in 1897 and of the atomic nucleus in 1911 established that the atom is actually a composite of a cloud of electrons surrounding a tiny but… …   Universalium

• Electric charge — SI symbol: Q SI quantity dimension: Q SI unit: coulomb other units: e Derivations from other quantities: Q = I · …   Wikipedia

• Rutherford backscattering spectroscopy — Rutherford backscattering spectrometry (RBS) is an analytical technique used in materials science. Sometimes referred to as high energy ion scattering (HEIS) spectrometry, RBS is used to determine the structure and composition of materials by… …   Wikipedia