3 documents found, page 1 of 1
Unfocused laser ignition of high-pressure He–H2-O2 combustible mixtures
Grosso Ferreira, R.; Carvalho, B.; Rodrigues, José-António; Rodrigues, R.; Smith, A.; Marraffa, L.; Lino da Silva, M.We report consistent ignition of high-pressure (p(fill)>20-30 bar) hydrogen-oxygen mixtures diluted with helium in two different combustion vessels, using an unfocused Nd:YAG laser. This corresponds to laser irradiances several orders of magnitude below the minimum ignition energies reported in the literature. This unusual phenomena has led us to try to measure the amount of laser radiation absorbed by the gas ...
The Dark Energy Survey and Operations: Years 1 to 3
Diehl, H. T.; Neilsen, E.; Gruendl, R.; Yanny, B.; Abbott, T. M. C.; Aleksic, J.; Allam, S.; Annis, J.; Balbinot, E.; Baumer, M.; Beaufore, L.Made available in DSpace on 2018-11-26T17:06:46Z (GMT). No. of bitstreams: 0 Previous issue date: 2016-01-01; The Dark Energy Survey (DES) is an operating optical survey aimed at understanding the accelerating expansion of the universe using four complementary methods: weak gravitational lensing, galaxy cluster counts, baryon acoustic oscillations, and Type la supernovae. To perform the 5000 sq-degree wide fiel...
The EChO science case
Tinetti, Giovanna; Drossart, Pierre; Eccleston, Paul; Hartogh, Paul; Isaak, Kate; Linder, Martin; Lovis, Christophe; Micela, Giusi; Ollivier, MarcThe discovery of almost two thousand exoplanets has revealed an unexpectedly diverse planet population. We see gas giants in few-day orbits, whole multi-planet systems within the orbit of Mercury, and new populations of planets with masses between that of the Earth and Neptune-all unknown in the Solar System. Observations to date have shown that our Solar System is certainly not representative of the general po...