R. S. Nelson – författare
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2 produkter
2 produkter
E-bok
PDF, Engelska, 2013783 kr
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The Observation of Atomic Collisions in Crystalline Solids presents a critical account of the more important experiments which have provided the basis for a better understanding of atomic collision phenomena in crystalline solids. Collisions have been divided into two artificial regimes; primary collisions which deal with the interaction of the incident particles with the solid, and secondary collisions which deal with those events which occur as a result of lattice atoms recoiling from primary encounters. Although the book is intended principally for the experimentalist some simple theoretical models have been introduced. It is hoped that the book will provide a useful introduction to the subject of atomic collisions in solids for the post-graduate research student, as well as providing a collection of the most important experimental data for established scientists actively engaged in the field. It is also intended to provide a background for the technologist engaged in such fields as the ion implantation doping of semiconductors.
Häftad, Engelska, 2013
561 kr
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Gastroscopy, the endoscopic examination of the interior of the stomach, has finally come of age. Although beset with multiple difficulties, and slow to develop, the method has achieved a sudden flowering in the past 10 years found in few other types of examination of the living human. The advances, the results of great interest and perseverance by many workers in all parts of the world, have been based on the happy combination of these efforts and the rapidly changing manufacture of various instruments to visualize, photograph, and biopsy all parts of the stomach at will. So rapid have been these advances that it has been difficult even for those intimately involved to keep abreast of the changes. The general physician public is in consequence still in considerable ignorance of what is now endoscopically available for the diag nosis of gastric disease. Many interesting types of gastric pathology have been and are still being better defined by endoscopy, but its particular value lies in the diagnosis of malignant neo plasia of the stomach. Whereas in the immediate past it was necessary to restrict examination to roentgenograms, at best an indirect means, it is now possible to visualize lesions, photograph them in color, and biopsy all suspicious areas with great accuracy. A visual and histologic diagnosis of cancer of the stomach may be made in well-equipped institutions in an hour or less.