This paper presents validation and assessment of ducted propellers for aircraft propulsion. Numerical methods simulation strategies are put forward, including steady/unsteady high-fidelity computational fluid dynamics (CFD) simulations simpler momentum-based methods. The comparisons the made using a propeller proposed by NASA. Simulations also performed analyzed at extended advance ratios, blad...

Endplate potentials were recorded from frog and toad sartorius neuromuscular junctions under conditions of greatly reduced quantal contents. The magnitudes of augmentation increased with the duration and frequency of stimulation, often increasing at an accelerating rate during 10-20-s conditioning trains. The magnitudes of the first and second components of facilitation also increased, but reac...

Abstract: Recently, focus has been placed on ocean energy resources because environmental concerns regarding the exploitation of hydrocarbons are increasing. Among the various ocean energy sources, tidal current power (TCP) is recognized as the most promising energy source in terms of predictability and reliability. The enormous energy potential in TCP fields has been exploited by installing TC...

We consider the problem of active reduction of the structural vibrations induced by the sloshing of large masses of fuel inside a partly full tank. The proposed study focuses on an experimental device mimicking an aircraft wing made of an aluminum rectangular plate equipped with piezoelectric patches at the clamped end and with a cylindrical tip-tank, more or less filled with liquid. After deri...

T. Gao, P. S. Eldridge, T. C. H. Liew, S. I. Tsintzos, G. Stavrinidis, G. Deligeorgis, Z. Hatzopoulos, and P. G. Savvidis Department of Materials Science & Technology, University of Crete, Greece IESL-FORTH, P.O. Box 1527, 71110 Heraklion, Crete, Greece School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore Cavendish Laboratory, University of Cambridge...

This study evaluates the pulsed tunable dye laser with wavelength 504 nm, frequency 10 Hz, and pulse width 1.2 microseconds for cholelitholysis. Power of 10-40 kW was directed through a 250-microns quartz fiber optic to ablate 55 gallstones (removed from 14 patients). The fiber was positioned in direct contact with the stones under saline. Power delivery was begun at 10 kW and increased in 10-k...

measurements Joaquim Blesa , Françoise Le Gall, Carine Jauberthie and Louise Travé-Massuyès Institut de Robòtica i Informàtica Industrial (CSIC-UPC), Llorens i Artigas, 4-6, 08028 Barcelona, Spain e-mail: [email protected] CNRS, LAAS, 7 avenue du colonel Roche, F-31400 Toulouse, France Univ de Toulouse, LAAS, F-31400 Toulouse, France e-mail: legall,cjaubert,[email protected] Univ de Toulouse, ...

Biliary injury during laparoscopic cholecystectomy is still a serious problem. Injury occurs as a result of technical errors or misidentification of ducts. Inexperience, inflammation, and aberrant anatomy are key risk factors. The most serious technical problem is cautery-induced injury. This problem may be avoided by use of cautery under very low power settings in the triangle of Calot. Miside...