electro-, electr-, electri-
(Greek > Latin: electric, electricity; from amber, resembling amber, generated from amber which when rubbed vigorously [as by friction], produced the effect of static electricity)
Electronics in our lives consists of numerous tools
Equipment which we use everyday relies on electronics to function including calculators, car controls, cameras, washing machines, medical scanners, mobile telephones, radar systems, computers; as well as many other applications or devices which are listed in this unit.
2. A photograph or other reproduction of an image formed by the action of an electron beam by an electron microscope.
The electron beam carries the images through an array of lenses and an enlarged electron image is used to stimulate a fluorescent screen that is photographed by a camera system.
2. An X-ray machine in which electrons transmitted from a hot-filament source are accelerated electrostatically, then focused to an extremely small point on the surface of a specimen by an electromagnetic lens.
A nondestructive analysis of the specimen can then be made by measuring the back-scattered electrons, the specimen current, the resulting X-radiation, or any other resulting process.3. A technique of analysis using the electron microscope based on spectral analysis of the scattered X-ray emission from the specimen induced by the electron beam.
By using this technique, it is possible to obtain quantitative data on, for example, the calcium concentration in different parts of a cell; however, it is necessary to use ultra thin frozen sections.
It provides much greater plowers of magnification than an optical microscope; that is, up to 1,000,000 times actual size without loss of sharpness and degree of contrast in the image.2. An electronic instrument that scans cell and tissue sections with a beam of electrons instead of visible light.
The specimen is stained with electron-opaque dyes and with its high magnification power, it creates an image that can be photographed or viewed on a florescent screen.3. A device for directing streams of electrons by means of electric and magnetic fields in a manner similar to the direction of visible light rays by means of glass lenses in an ordinary microscope.
Since electrons carry waves of much smaller wavelengths than light waves, correspondingly greater magnifications can be obtained.
The electron microscope will resolve details from 1,000 to 10,000 times finer than the optical microscope and images can be studied on a fluorescent screen or recorded photographically.
2. An electrode that has the primary function of secondary emission of electrons.
It is used in multiplier phototubes and some types of television camera tubes.
2. A drift mobility of electrons in a semiconductor which consists of the electron velocity divided by the applied electric field.
2. An electron-tube structure that produces current amplification.
An electron beam containing the desired signal is reflected from the surfaces of each of a series of dynodes (electrodes whose primary function is the secondary emission of electrons), and at each reflection an impinging electron releases two or more secondary electrons, so that the beam builds up in strength.3. An instrument used for amplifying a very small current using the effects of secondary emission.
Electrons from the original current strike an anode, producing secondary electrons that are directed to the next anode in a multistage process until the desired level of current is obtained.
The electron stream from the photocathode is reflected off each dynode in sequence, with a secondary emission adding electrons to the stream at each reflection.
2. A type of neutrino that obeys a conservation law together with the electron, with the total number of electrons and electron-neutrinos minus the total number of their antiparticles remaining constant.
2. A type of electron paramagnetic resonance spectroscopy permitting greatly enhanced resolution, in which a material is simultaneously irradiated at one of its frequencies and by a second oscillatory field during which its frequency is swept over the range of nuclear frequencies.