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  • NDEZ, M onti, P ASIANOT, V ITEK
  • 2004
The formation and migration of vacancies in (11 21) twin boundaries in a-Ti and a-Zr are studied by computer modelling. Three empirical central force potentials constructed within the embedded-atom method are used to represent atomic interactions. Minimum-energy structures for the grain boundary are found ® rst and the vacancy is then introduced by removing(More)
Surgical repair of ventral hernias may often be quite difficult; however, the use of prosthesis, now generally accepted by many surgeons, has improved the results of such type of surgery. The Authors experience confirm the safety of the expanded PTFE and its versatility of employment, obtaining good functional and aesthetic results.
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