The weight of the oxidizer dominates the take-off weight of rocket based propulsion systems. Therefore, airbreathing engines that consume the oxygen from the atmosphere offer a promising alternative. At flight conditions with Mach numbers above 6 SCramjet propulsion systems represent a better suited concept than ramjet systems, as the high static temperature resulting from the deceleration to s...

We have measured the nucleation conditions of n-propanol, n-butanol, and n-pentanol in a supersonic Laval nozzle, and estimated that the maximum nucleation rate J is 5 x 10(16) cm(-3) s(-1) with an uncertainty factor of 2. Plotting the vapor pressures p(J(max) ) and temperatures T(J(max) ) corresponding to the maximum nucleation rate as ln(p) versus 1T, produces a series of well separated strai...

A quasi one-dimensional analysis of a STOVL aircraft nozzle in hover is performed to estimate the gross thrust coefficient as a function of nozzle pressure and nozzle area ratios. The analysis is supported by subscale, cold flow test results. The nozzle performance was found to be less than desirable in hover due to the overexpansion arising from the geometrical constraints of the existing nozzle.

The airframe-integrated linear-spike nozzle concept applied to an external nozzle for high-speed aircraft was evaluated with regard to the thrust augmentation capability and the trim balance. The main focus was on the vehicle aftbody. The baseline airframe geometry was first premised to be a hypersonic waverider design. The baseline aftbody case had an external nozzle comprised of a simple dive...

Qualified topological relations between spatial objects with possible vague shape L. Bejaoui abcd; F. Pinet c; Y. Bedard ab; M. Schneider cd a Department of Sciences géomatiques, Laval University, Quebec city, Que., Canada b Industrial Research Chair in Geospatial Databases for Decision Support, Laval University, Quebec city, Que., Canada c Cemagref-Clermont-Ferrand, France d Department of Comp...

the Management of Dependences between Activities Sylvain Lizotte & Brahim Chaib-draa Computer Science Department, Laval University, Ste-Foy, PQ, Canada, G1K 7P4 e-mail: {lizotte,chaib}@ift.ulaval.ca Short form of the title: Coordination = Management of Dependences Author to whom correspondence should be sent: B. Chaib-draa Mailing address: Département Informatique, Pav. Pouliot, Université Lava...

1Centre de Recherche en Rhumatologie et Immunologie, Centre de Recherche du Centre Hospitalier Universitaire de Québec, Faculté de Médecine de l’Université Laval, Québec, QC; 2Centre de Recherche du Centre Hospitalier Universitaire de Québec and Department of Molecular Medicine, Université Laval, Québec, QC; 3Department of Biochemistry, University of Cambridge, Cambridge, United Kingdom; 4Unive...

Lisa Topolnik,1,2,3 Simon Chamberland,1,3 Joe-Guillaume Pelletier,2 Israeli Ran,2 and Jean-Claude Lacaille2 1Département de Biochimie et de Microbiologie, Faculté des Sciences et de Génie, Université Laval, Québec City, Québec, Canada G1V 0A6, 2Département de Physiologie, Groupe de Recherche sur le Système Nerveux Central, Université de Montréal, Montréal, Québec, Canada H3C 3J7, and 3Unite de ...