gas discharge detector
31Atom — The atom is the smallest unit of an element that retains the chemical properties of that element. An atom has an electron cloud consisting of negatively charged electrons surrounding a dense nucleus. The nucleus contains positively charged… …
32Venera 9 — Infobox Spacecraft Name = Venera 9 Caption = Venera 9 orbiter Organization = USSR Major Contractors = Mission Type = Orbiter and Lander Satellite Of = Venus Orbital Insertion Date = October 20, 1975 Launch = June 8, 1975 Launch Vehicle = Proton… …
33Venera 10 — Infobox Spacecraft Name = Venera 10 Caption = Venera 10 orbiter Organization = USSR Major Contractors = Mission Type = Orbiter and Lander Satellite Of = Venus Orbital Insertion Date = October 23, 1975 Launch = May 14, 1975 Launch Vehicle = Proton …
34PDD (disambiguation) — PDD is an abbreviation for pervasive developmental disorder. PDD may also refer to: P. Diddy Partnership for Democracy and Development in Central America Pas de deux, a type of ballet dance PDD (2,2 bis trifluoromethyl 1 4,5 difluoro 1,3 dioxole) …
35Wagon-wheel effect — The wagon wheel effect (alternatively, or stagecoach wheel effect, stroboscopic effect) is an optical illusion in which a spoked wheel appears to rotate differently from its true rotation. The wheel can appear to rotate more slowly than the true… …
36spectroscopy — spectroscopist /spek tros keuh pist/, n. /spek tros keuh pee, spek treuh skoh pee/, n. the science that deals with the use of the spectroscope and with spectrum analysis. [1865 70; SPECTRO + SCOPY] * * * Branch of analysis devoted to identifying… …
37radiation measurement — ▪ technology Introduction technique for detecting the intensity and characteristics of ionizing radiation, such as alpha, beta, and gamma rays or neutrons, for the purpose of measurement. The term ionizing radiation refers to those… …
38mass spectrometry — or mass spectroscopy Analytic technique by which chemical substances are identified by sorting gaseous ions by mass using electric and magnetic fields. A mass spectrometer uses electrical means to detect the sorted ions, while a mass spectrograph …
39Invention of radio — Great Radio Controversy redirects here. For the album by the band Tesla, see The Great Radio Controversy. Contents 1 Physics of wireless signalling 2 Theory of electromagnetism …
40Lightning — This article is about the atmospheric electrical phenomenon. For other uses, see Lightning (disambiguation). See also: Lightning strike Lightning striking Atlanta, United States Lightning is an atmospheric electrostatic discharge (spar …
