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Electron microscopy
| Глоссарий по физической оптике |
The visual examination of very small structures with a device that forms greatly magnified images of objects by using electrons rather than light to create an image. an electron microscope focuses a beam of electrons at an object and detects the actions of electrons as they scatter off the surface to form an image.
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Просвечивающая, русский
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Electron, английский
- The electron is a low mass particle ( 1/1836 that of a proton ) with a unit negative electric charge. in simple terms the electrons are said to orbit around the nucleus of atoms . positively charged electrons can also exist, these being known as positrons
- Negatively charged particle of an atom.
- An elementary particle of an atom with a negative electrical charge and a mass of 1/1837 of a proton; electrons surround the positively charged nucleus of an atom and determine the chemical properties of an atom. the movement of electrons in an electrical conductor constitutes an electric current.
- An elementary particle of an atom with a negative electrical charge and a mass of
- One of the fundamental constituents of atoms. the electron is a very small negatively charged particle with a rest mass of approximately 1/1836 that of the hydrogen atom, or 9.107 x 10-28 gm. it has an electric charge of 4.802 x 10-10 statcoulomb (the electrostatic unit of charge). electrons appear to be uniform in mass and charge.
Electron affinity, английский
The amount of energy absorbed or given off when an atom accepts an electron.
Electron bands, английский
Electron beam, английский
A concentrated flow of electrons in a nominated direction.
Electron beam brazing, английский
Electron beam convergence, английский
Electron beam current, английский
Electron beam cutting, английский
Electron beam divergence, английский
Electron beam heat treating, английский
Electron beam machining, английский
Electron beam melting, английский
Electron beam power, английский
Electron beam recorder, английский
Electron beam recording, английский
Запись электронным лучом
Electron beam weld rotor, английский
Electron beam welding, английский
Сварка электронным лучом
Electron beam welding , английский
Electron beam , английский
Electron capture, английский
Electron capture (rt), английский
A mode of radioactive decay in which a bound electron is captured by the nucleus of the same atom, producing a vacancy in an inner emission of characteristic x-rays or auger electrons.
Examination, английский
- Обследование
- Экспертиза; проверка; рассмотрение (оценка патентоспособности заявки на патент, производимая патентным ведомством)
- 1. an act of looking at someone or something carefully from the examination of the x-ray photographs, it seems that the tumour has not spread. 2. the act of looking at someone to find out what is wrong with him or her the surgeon carried out a medical examination before operating. 3. a written or oral test to see if a student is progressing satisfactorily (note: in this sense, often abbreviated to exam.)
- An examination of a dead body by a pathologist to find out the cause of death the post mortem showed that he had been poisoned. abbr pm. also called autopsy
- A searching by, or cognizance of, a magistrate, or other authorized officer. now strict in navy and army.
- Проверка; исследование; рассмотрение
- The checking of a taxpayer`s tax return, accounts, self-assessment calculations, etc. the process may or may not include an audit of the taxpayer`s own books.
- Осмотр; освидетельствование, обследование; исследование, проверка, контроль
- Изучение
- The study of a patent application by a patent office examiner to determine whether or not an invention can be patented and whether the application complies with all the legal requirements (including formal requirements). depending on issues raised in the resulting examination report, amendment of the patent application may be required.
- Process of testing materials, interpreting and evaluating test indications to determine if the test object meets specified acceptance criteria.1
Microscope, английский
- Microscopio
- A scientific instrument with lenses, which makes very small objects appear larger the tissue was examined under the microscope. under the microscope it was possible to see the cancer cells. comment: in an ordinary or light microscope the image is magnified by lenses. in an electron microscope the lenses are electromagnets and a beam of electrons is used instead of light, thereby achieving much greater magnifications.
- Device used to form a highly magnified image of tiny objects for clear visualization
- Instrument that provides enlarged images of small objects. microscope, compound: conventional microscope, using geometrical optics for magnification. also called laboratory microscope. microscope, interference: magnifier using the wavelength of light as a unit of measure for surface contour and other characteristics. microscope, metallographic: metallurgical microscope incorporating a camera. also called a metallograph. most metallographic microscopes share these features: (a) stand with concealed shock absorbers, (b) intense light source, (c) inverted stand so that the test object is face down, (d) viewing screens for prolonged tasks such as dirt count or grain size measurements, (e) bright, dark and polarized illumination options. microscope, metallurgical: microscope designed with features suited for metallography. microscope, phase contrast: laboratory microscope with two additional optical elements to transmit both diffracted and undiffracted light, revealing refractive index discontinuities in a completely transparent test object. microscope, polarizing: microscope with polarizing elements to restrict light vibration to a single plane for studying material with directional optical properties. as fibers, crystals, sheet plastic and materials under strain are rotated between crossed polarizers on the microscope stage, they change color and intensity in a way that is related to their directional properties. mig welding: see gas metal arc welding.
- Instrument that provides enlarged images of very small objects.
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Просвечивающая, русский
Electrography, английский
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