electromechanical-coupling coefficient

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• Electromechanical coupling coefficient — is a numerical measure of the conversion efficiency between electrical and acoustic energy in piezoelectric materials.Qualitatively the electromechancial coupling coefficent, k, can be determined as:: mathcal{K}^{ 2} = frac{1}{mbox{ energy… …   Wikipedia

• Mechanical filter — Figure 1. A mechanical filter made by the Kokusai Electric Company intended for selecting the narrow 2 kHz bandwidth signals in SSB radio receivers. It operates at 455 kHz, a common IF for these receivers, and is dimensioned 45×15×15 mm ( …   Wikipedia

• Электромеханический фильтр — ЭМФ советского производства, предназначенный для выделения нижней боковой полосы в аппаратуре радиосвязи с промежуточной частотой 500 кГц. Ширина полосы пропускания  3,1 кГц. Механическ …   Википедия

• коэффициент электромеханической связи — Основной параметр, показывающий, какая часть общей энергии W пьезоэлектрика преобразуется в механическую Wм или электрическую Wе Определяется по формуле . Значение b зависит от материала и моды колебаний пьезопреобразователя. Для колеблющегося по …   Справочник технического переводчика

• Gallium phosphate — (GaPO4 or gallium orthophosphate) is a colorless trigonal crystal with a hardness of 5.5 on the Mohs scale. GaPO4 is isotypic with quartz, possessing very similar properties, but the silicon atoms are alternately substituted with gallium and… …   Wikipedia

• Quartz crystal microbalance — A quartz crystal microbalance (QCM) measures a mass per unit area by measuring the change in frequency of a quartz crystal resonator. The resonance is disturbed by the addition or removal of a small mass due to oxide growth/decay or film… …   Wikipedia

• niobium processing — Introduction       preparation of the ore for use in various products.       Niobium (Nb) has a body centred cubic (bcc) crystal structure and a melting point of 2,468° C (4,474° F). Of the refractory metals, it has the lowest density and best… …   Universalium

• Hall effect — For the Colombian band, see The Hall Effect (band). The Hall effect is the production of a voltage difference (the Hall voltage) across an electrical conductor, transverse to an electric current in the conductor and a magnetic field perpendicular …   Wikipedia

• Electronic filter — Electronic filters are electronic circuits which perform signal processing functions, specifically intended to remove unwanted signal components and/or enhance wanted ones. Electronic filters can be:*passive or active *analog or digital *discrete …   Wikipedia

• Magnetic moment — Electromagnetism Electricity · …   Wikipedia

• Magnet — This article is about objects and devices that produce magnetic fields. For a description of magnetic materials, see magnetism. For other uses, see Magnet (disambiguation) …   Wikipedia