8,879 research outputs found
J.A. Daigneau
No full textPhotograph - J.A. Daigneau building, Athabasca, Alberta. It was built in 1912 by Joseph Daigneau and burnt down in 198
Author inscription in The Chinese slave-girl: a story of woman's life in China
No full textThis edition includes a gift inscription by author Rev. J.A. Davis, "To Rev. A. G. Russell with the warmest regards of the author J.A. Davis."Davis, John Agnell, 1839-1897
Group living homes for older people with dementia: Concept and effects
No full textEefsting, J.A. [Promotor]Pot, A.M. [Promotor]Depla, M.F.I.A. [Copromotor]Lange, J. de [Copromotor
Marriage record of Correa, J. A. and Arteaga, Matilde
No full textMarriage license for J.A. Correa and Matilde Arteaga. Pedro Duarte was the officiant
Energieverloop en golfopstuwing bij brekende onregelmatige golven: Metingen en berekeningen
No full textA description is given of a model developed for the prediction of the dissipation of energy in random waves breaking on a beach. The dissipation rate per breaking wave is estimated from that in a bore of corresponding height, while the probability of occurrence of breaking waves is estimated on the basis of a wave height distribution with an upper cut-off which in shallow water is determined mainly by the local depth. A comparison with measurements of wave height decay and set-up, on a plane beach and on a beach with a bar-trough profile, indicates that the model is capable of predicting qualitatively and quantitatively all the main features of the data. A summary of this thesis is published as: Battjes, J.A., Janssen, J.P.F.M. (1978) Energy loss and set-up due to breaking random waves, proc. ICCE HamburgHydraulic EngineeringCivil Engineering and Geoscience
Visueel & dynamisch: De stedebouw van Granpré Molière en Verhagen 1915-1950
No full textDe vernieuwing van een in formalisme en academisme vastgelopen vormentaal van architectuur en stadsuitleg tekende zich in de eerste helft van deze eeuw af in twee stromingen: de ene hechtte grote waarde aan zintuiglijke, visuele kwaliteiten en het gebruik van natuurlijke materialen, waarbij grote aandacht werd gegeven aan het specifieke en individuele in de opgave; de andere zocht naar de uiterste zuiverheid van expressie, hetgeen noodzaakte tot eliminatie van wat bijkomstig scheen, waarbij het algemene prioriteit kreeg boven het individuele. Deze stromingen ten onrechte vereenvoudigd tot Delftse School versus het Nieuwe Bouwen of tot Traditionalisme versus Functionalisme komen rond 1950 in hoofdzaak weer in één bedding samen. Ir J.A. Kuiper, schrijver van deze studie, behoort tot de tweede generatie architecten en stedebouwkundigen in het door Granpré Molière en Verhagen in 1916 opgerichte bureau, dat thans als Kuiper Compagnons zijn voortzetting vindt.ArchitectureArchitectur
Optical Flow Based State Estimation for an Indoor Micro Aerial Vehicle
No full textThis work addresses the problem of indoor state estimation for autonomous flying vehicles with an optic flow approach. The paper discusses a sensor configuration using six optic flow sensors of the computer mouse type augmented by a three-axis accelerometer to estimate velocity, rotation, attitude and viewing distances. It is shown that the problem is locally observable for a moving vehicle. A Kalman filter is used to extract these states from the sensor data. The resulting approach is tested in a simulation environment evaluating the performance of three Kalman filter algorithms under various noise conditions. Finally, a prototype of the sensor hardware has been built and tested in a laboratory setup. Paper published: Verveld, M.J., Chu, Q.P., De Wagter, C. and Mulder, J.A. “Optic Flow Based State Estimation for an Indoor Micro Air Vehicle” AIAA Guidance, Navigation, and Control Conference, August 2010, Toronto, Canada AIAA 2010-8209, DOI: 10.2514/6.2010-8209Aerospace EngineeringControl & Simulatio
Optimization of carbon dioxide supply in raceway reactors: influence of carbon dioxide molar fraction and gas flow rate
No full textInfluence of CO2 composition and gas flow rate to control pH in a pilot-scale raceway producing Scenedesmus sp. was studied. Light and temperature determined the biomass productivity whereas neither the CO2 molar fraction nor the gas flow rate used influenced it; because pH was always controlled and carbon limitation did not take place. The CO2 molar fraction and the gas flow rate influenced carbon loss in the system. At low CO2 molar fraction (2-6%) or gas flow rate (75-100 l·min-1) the carbon efficiency in the sump was higher than 95%, 85% of the injected carbon being transformed into biomass. Conversely, at high CO2 molar fraction (14%) or gas flow rate (150 l·min-1) the carbon efficiency in the sump was lower than 67%, 32% of the carbon being fixed as biomass. Analysis here reported allows the pH control to be optimized and production costs to be reduced by optimizing CO2 efficiency
Detection of the irradiated donor in the LMXBs 4U 1636-536 (=V801 Ara) and 4U 1735-444 (=V926 Sco)
No full textPhase-resolved VLT spectroscopy of the bursting low-mass X-ray binaries 4U 1636-536/V801 Ara and 4U 1735-444/V926 Sco is presented. Doppler images of the N iiiλ4640 Bowen transition reveal compact spots which we attribute to fluorescent emission from the donor star and enable us to define a new set of spectroscopic ephemerides. We measure Kem= 277 ± 22 and 226 ± 22 km s−1 from the N iii spots in V801 Ara and V926 Sco, respectively, which represent strict lower limits to the radial velocity semi-amplitude of the donor stars. Our new ephemerides provide confirmation that light-curve maxima in V801 Ara and likely V926 Sco occur at superior conjunction of the donor star and hence photometric modulation is caused by the visibility of the X-ray heated donor. The velocities of He iiλ4686 and the broad Bowen blend are strongly modulated with the orbital period, with phasing supporting emission dominated by the disc bulge. In addition, a reanalysis of burst oscillations in V801 Ara, using our spectroscopic T0, leads to K1= 90–113 km s−1. We also estimate the K-corrections for all possible disc flaring angles and present the first dynamical constraints on the masses of these X-ray bursters. These are K2= 360 ± 74 km s−1, f(M) = 0.76 ± 0.47 M⊙ and q= 0.21–0.34 for V801 Ara and K2= 298 ± 83 km s−1, f(M) = 0.53 ± 0.44 M⊙ and q= 0.05–0.41 for V926 Sco. Disc flaring angles α≥ 12° and q≃ 0.26–0.34 are favoured for V801 Ara whereas the lack of K1 constraint for V926 Sco prevents tight constraints on this system. Although both binaries seem to have intermediate inclinations, the larger equivalent width of the narrow N iii line in V801 Ara at phase 0.5 relative to phase 0 suggests that it has the higher inclination of the two
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