ABSTRACT
A new multichannel frequency modulated continuous-wave reflectometry diagnostic has been successfully installed and commissioned on ASDEX Upgrade to measure the plasma edge electron density profile evolution in front of the Ion Cyclotron Range of Frequencies (ICRF) antenna. The design of the new three-strap ICRF antenna integrates ten pairs (sending and receiving) of microwave reflectometry antennas. The multichannel reflectometer can use three of these to measure the edge electron density profiles up to 2 × 1019 m-3, at different poloidal locations, allowing the direct study of the local plasma layers in front of the ICRF antenna. ICRF power coupling, operational effects, and poloidal variations of the plasma density profile can be consistently studied for the first time. In this work the diagnostic hardware architecture is described and the obtained density profile measurements were used to track outer radial plasma position and plasma shape.
ABSTRACT
Os autores apresentam sua experiencia com o uso de veia do cordao umbilical humano como enxerto arterial e sugerem tratar-se de uma boa opcao para os pacientes que nao possuem veia safena adequada. Analisam 16 pacientes operados com um seguimento maximo de 16 meses. Demonstram que o metodo de tratamento com glutaraldeido, alem de preservar todas as camadas da veia, aumenta sua resistencia a sutura. Finalmente, afirmam sua impressao quanto as possiveis vantagens do uso deste enxerto em posicoes extra-anatomicas, em relacao aos demais enxertos plasticos
