interference emission
11extremely low-frequency emission — Abbreviated ELF. Radiation emitted by a computer monitor and other common electrical appliances. ELF emissions fall into the range of 5 to 2000 hertz and decline with the square of the distance from the source. Emissions are not constant… …
12very low-frequency emission — Abbreviated VLF. Radiation emitted by a computer monitor and other common household electrical appliances, such as televisions, hair dryers, electric blankets, and food processors. VLF emissions range from 2 to 400kHz and decline with the… …
13single-photon emission computed tomography — (SPECT) a type of tomography in which gamma photon–emitting radionuclides are administered to patients and then detected by one or more gamma cameras rotated around the patient. From the series of two dimensional images produced, a three… …
14radio frequency interference — Abbreviated RFI. Many electronic devices, including radios, televisions, computers, and peripherals, can interfere with other signals in the radio frequency range by producing electromagnetic radiation. The use of radio frequencies is… …
15light — light1 lightful, adj. lightfully, adv. /luyt/, n., adj., lighter, lightest, v., lighted or lit, lighting. n. 1. something that makes things visible or affords illumination: All colors depend on light. 2. Physics …
16electromagnetic radiation — Physics. radiation consisting of electromagnetic waves, including radio waves, infrared, visible light, ultraviolet, x rays, and gamma rays. [1950 55] * * * Energy propagated through free space or through a material medium in the form of… …
17spectroscopy — 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… …
18Introduction to quantum mechanics — This article is an accessible, non technical introduction to the subject. For the main encyclopedia article, see Quantum mechanics. Quantum mechanics …
19Reseaux d'antennes — Réseaux d antennes Un réseau d antennes est un ensemble d antennes séparées et alimentées de façon synchrone. C est à dire que le déphasage du courant entre chaque paire d antennes est fixe. Nous verrons plus loin qu un réseau peut comporter des… …
20Réseaux d'antennes — Un réseau d antennes est un ensemble d antennes séparées et alimentées de façon synchrone. C est à dire que le déphasage du courant entre chaque paire d antennes est fixe. Nous verrons plus loin qu un réseau peut comporter des éléments non… …
