富足女人
发表于 2025-3-23 10:20:32
Samantha Jenkins,Steven Robert Kirk) for analyzing biologically relevant materials and molecules. G-SIMS is an easy-to-use method that considerably simplifies complex static secondary ion mass spectrometry (SSIMS) spectra into spectra with only those ions that are highly characteristic of the surface. G-SIMS provides information abou
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发表于 2025-3-23 17:15:02
Samantha Jenkins,Steven Robert Kirkf Auger elctrons or photoelectrons. If the incident beam is to reach the sample, and the emitted electrons are to be detected, then their mean free paths in the region of the sample must be greater than the physical dimensions of the apparatus involved, otherwise scattering will distort the outcome
Enliven
发表于 2025-3-23 19:59:53
Samantha Jenkins,Steven Robert Kirke taken from the ordinary laboratory or industrial environment and analyzed in an electron spectrometer will be found to have a surface composition consisting of primarily carbon and oxygen. This is due to the inevitable presence of adsorbed hydrocarbons, water vapour, oxide layers, fingerprints and
故意
发表于 2025-3-23 22:44:02
Samantha Jenkins,Steven Robert Kirkng latices of various vegetal origins, it was first applied industrially to obtain rubber, used in the beginning to waterproof fabrics and to make elastic cloths. The discovery of the vulcanization process in 1846 made it possible to mould a multitude of objects. Not until 1880, when it was applied
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发表于 2025-3-24 04:31:06
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giggle
发表于 2025-3-24 06:57:37
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铁砧
发表于 2025-3-24 11:33:34
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向前变椭圆
发表于 2025-3-24 15:39:53
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Fibrin
发表于 2025-3-24 22:20:11
olecules exert upon the surface. By knowing the pressure the flux can be evaluated. From the kinetic theory of gases the molecular flux .is given by the Herz-Knudsen equation:. where . is the number of molecules per unit volume and . is the average speed of the molecules.
superfluous
发表于 2025-3-25 02:15:40
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