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Improvement of carbon fiber surface properties using electron beam irradiation

Nuclear Science and Techniques 2007年第1期18卷 39-41页

作者： eddy segura pino Luci Diva Brocardo MACHADO Claudia GIOVEDI Instituto de Pesquisas Energéticas e Nucleares-IPEN/CNEN-SP Av.Prof.Lineu Prestes2242Cidade Universitária05508-000Sāo PauloSP-Brazil Centro Tecnológico da Marinha em Sāo Paulo Av.Prof.Lineu Prestes2468Cidade Universitária05508-000Sāo PauloSP-Brazil

Carbon fiber-reinforced advance composites have been used for structural applications,mainly on account of their mechanical *** main factor for a good mechanical performance of carbon fiber-reinforced com- posite is the interfacial interaction between its components,which are carbon fiber and polymeric *** aim of this study is to improve the surface properties of the carbon fiber using ionizing radiation from an electron beam to obtain better adhesion properties in the resultant *** radiation was applied on the carbon fiber itself before preparing test specimens for the mechanical *** results showed that EB irradiation improved the ten- sile strength of carbon fiber *** maximum value in tensile strength was reached using doses of about 250 *** breakage,the morphology aspect of the tensile specimens prepared with irradiated and non-irradiated car- bon fibers were *** micrographs showed modifications on the carbon fiber surface.

关键词：碳纤维表面性质电子束辐射改性

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Laparoscopic approach in gastrointestinal emergencies

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World Journal of Gastroenterology 2016年第9期22卷 2701-2710页

作者： Rosa M Jimenez Rodriguez Juan José segura-Sampedro Mercedes Flores-Cortés Francisco López-Bernal Cristobalina Martín Verónica pino Diaz Felipe Pareja Ciuro Javier Padillo Ruiz Department of Surgery Hospital Universitario Virgen del Rocio 41013 Sevilla Spain Hospital Universitario Son Espases 07010 Palma de Mallorca Spain

This review focuses on the laparoscopic approach to gastrointestinal emergencies and its more recent indications. Laparoscopic surgery has a specific place in elective procedures, but that does not apply in emergency situations. In specific emergencies, there is a huge range of indications and different techniques to apply, and not all of them are equally settle. We consider that the most controversial points in minimally invasive procedures are indications in emergency situations due to technical difficulties. Some pathologies, such as oesophageal emergencies, obstruction due to colon cancer, abdominal hernias or incarcerated postsurgical hernias, are nearly always resolved by conventional surgery, that is, an open approach due to limited intraabdominal cavity space or due to the vulnerability of the bowel. These technical problems have been solved in many diseases, such as for perforated peptic ulcer or acute appendectomy for which a laparoscopic approach has become a wellknown and globally supported procedure. On the other hand, endoscopic procedures have acquired further indications, relegating surgical solutions to a second place; this happens in cholangitis or pancreatic abscess drainage. This endoluminal approach avoids the need for laparoscopic development in these diseases. Nevertheless, new instruments and new technologies could extend the laparoscopic approach to a broader array of potentials procedures. There remains, however, a long way to go.

关键词： Minimally invasive surgery Gastrointestinal surgery Emergency surgery Digestive emergencies Abdominal emergencies

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Synchronization of Weighted Essentially Non-Oscillatory Methods

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Communications in Computational Physics 2008年第6期4卷 56-71页

作者： Ellen M.Taylor M.pino Martin Department of Mechanical and Aerospace Engineering Princeton UniversityPrincetonNJ 08544USA

Weighted essentially non-oscillatory(WENO)methods have been developed to simultaneously provide robust shock-capturing in compressible fluid flow and avoid excessive damping of fine-scale flow features such as *** certain conditions in compressible turbulence,however,numerical dissipation remains unacceptably high even after optimization of the linear component that dominates in smooth *** the nonlinear error that remains,we demonstrate that a large fraction is generated by a“synchronization deficiency”that interferes with the expression of theoretically predicted numerical performance characteristics when the WENO adaptation mechanism is *** deficiency is illustrated numerically in simulations of a linearly advected sinusoidal wave and the Shu-Osher problem[***.,83(1989),pp.32-78].It is shown that attempting to correct this deficiency through forcible synchronization results in violation of *** conclude that,for the given choice of candidate stencils,the synchronization deficiency cannot be adequately resolved under the current WENO smoothness measurement technique.

关键词： Direct numerical simulation large eddy simulation compressible turbulence shock capturing.

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