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Atlas of Machined Surfaces - E.j. Davis - Bog - Springer - Plusbog.dk

Atlas of Machined Surfaces - E.j. Davis - Bog - Springer - Plusbog.dk

A variety of manufacturing processes are used to create requirements in order to specify a manufacturing process which will produce a surface having the necessary characteristics. The engineering surfaces, each of which produces a surface with its own characteristic topography. It is important to realize that this quality engineer needs to have a system which will provide topography may affect the suitability of a surface for specific sufficiently detailed information, relative to the specified functional applications. Unfortunately, the relationship between characteristics, to ensure that surfaces have been produced within surface topography and functional behaviour is not yet fully the pre-determined tolerance levels. understood. It is clear, however, that there are two quite distinct issues which need to be addressed: (1) the relationship between SURFACE CHARACTERIZATION manufacture and the resulting surface topography, and (2) the relationship between topography and function. It is also clear that The most common method of determining surface characteristics is an adequate understanding of these two issues can only be through the use of a stylus-based measuring instrument. The stylus achieved through the use of a suitable technique for is drawn across the surface at near constant velocity for a pre­ characterization of the topography. Such a characterization determined distance. The vertical excursions of the stylus, relative procedure involves both visual and numerical techniques.

DKK 663.00
1

Scanning Tunneling Microscopy - - Bog - Springer - Plusbog.dk

Scanning Tunneling Microscopy - - Bog - Springer - Plusbog.dk

The publication entitled "Surface Studies by Scanning Tunneling Mi­ Rl croscopy" by Binnig, Rohrer, Gerber and Weibel of the IBM Research Lab­ oratory in Riischlikon in 1982 immediately raised considerable interest in the sur­ face science community. It was demonstrated in Reference R1 that images from atomic structures of surfaces like individual steps could be obtained simply by scanning the surface with a sharp metal tip, which was kept in a constant distance of approximately 10 A from the sample surface. The distance control in scanning tunneling microscopy (STM) was realized by a feedback circuit, where the electri­ cal tunneling current through the potential barrier between tip and sample is used for regulating the tip position with a piezoelectric xyz-system. A similar experi­ mental approach has already been described by Young et al. for the determination l of the macroscopic roughness of a surface. A number of experimental difficulties had to be solved by the IBM group until this conceptual simple microscopic method could be applied successfully with atomic resolution. Firstly, distance and scanning control of the tip have to be operated with sufficient precision to be sensitive to atomic structures. Secondly, sample holder and tunneling unit have to be designed in such a way that external vibrations do not influence the sample-tip distance and that thermal or other drift effects become small enough during measurement of one image.

DKK 663.00
1

Single Cell Sequencing and Systems Immunology - - Bog - Springer - Plusbog.dk

Atlas of Economic Mineral Deposits - - Bog - Springer - Plusbog.dk

Immunological and Clinical Aspects of Allergy - - Bog - Springer - Plusbog.dk

DKK 434.00
1