منابع مشابه
Elastic theory of icosahedral quasicrystals – application to straight dislocations
In quasicrystals, there are not only conventional, but also phason displacement fields and associated Burgers vectors. We have calculated approximate solutions for the elastic fields induced by two-, threeand fivefold straight screwand edge-dislocations in infinite icosahedral quasicrystals by means of a generalized perturbation method. Starting from the solution for elastic isotropy in phonon ...
متن کاملDislocations & Fractures
tit r* -By F. J. Cotton. vv. a. Saunders & Co. Under this title Dr. Frederick Cotton has compiled a text-book on the subject of injuries to bones and joints which should certainly take its place as a standard work. The author has amply illustrated his subject, and in fact relies on illustration almost as much as letter press to make his subject clear, for in GOO odd pages there are 1,200 or mor...
متن کاملPerilunate dislocations.
THE PATIENT A 37-year-old man injured his right wrist in a motor vehicle collision. In the emergency department he had severe wrist pain and median nerve paresthesia. Wrist radiographs identified a dorsal perilunate dislocation (PLD) with the carpus dislocated dorsally and the lunate tilted volar but still located in the lunate fossa. Post-reduction computed tomography scan confirmed no fractures.
متن کاملCrystal Dislocations
Crystal dislocations were invisible until the mid-20th century although their presence had been inferred; the atomic and molecular scale dimensions had prevented earlier discovery. Now they are normally known to be just about everywhere, for example, in the softest molecularly-bonded crystals as well as within the hardest covalently-bonded diamonds. The advent of advanced techniques of atomic-s...
متن کاملArthroscopic treatment of perilunate dislocations and fracture dislocations.
Background The key to a successful result in the treatment of perilunate dislocations (PLDs) and fracture-dislocations (PLFDs) is the restoration of normal alignment of the carpal bones, followed by stable maintenance until healing. This article aimed to assess whether arthroscopic techniques are a reliable surgical option for the treatment of this challenging injury. Materials and Methods Twen...
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ژورنال
عنوان ژورنال: Nature
سال: 1974
ISSN: 0028-0836,1476-4687
DOI: 10.1038/247122b0