Concept

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Related publications (28)

Entropy-based Multi-stream Combination

Full-combination multi-band approach has been proposed in the literature and performs well for band-limited noise. But the approach fails to deliver in case of wide-band noise. To overcome this, multi-stream approaches are proposed in literature with varying degree of success. Based on our observation that for a classifier trained on clean speech, the entropy at the output of the classifier increases in presence of noise at its input, we used entropy as a measure of confidence to give weightage to a classif

IDIAP2002

Divertor geometry effects on detachment in TCV

Basil Duval, Richard Pitts, Jean-Marc Moret, Ivo Furno

Experimental observations and some preliminary results from B2-Eirene code modelling of divertor detachment in the TCV tokamak are reported, with emphasis on the aspects of this detachment related to divertor geometry. The contribution is restricted to deuterium fuelled ohmic plasmas for which the CB drift is directed away from the X-point of lower single-null, open diverted equilibria with fixed elongation and triangularity. Unlike more conventional diverted equilibria, however, the configurations describe

2001

A Conversation with John W. Tukey and Elizabeth Tukey

Stephan Morgenthaler

John Wilder Tukey, Donner Professor of Science Emeritus at Princeton University, was born in New Bedford, Massachusetts, on June 16, 1915. After earning bachelor's and master's degrees in chemistry at Brown University in 1936 and 1937, respectively, he started his career at Princeton University with a Ph.D. in mathematics in 1939 followed by an immediate appointment as Henry B. Fine Instructor in Mathematics. A decade later, at age 35, he was advanced to a full professorship. He directed the Statistical Res

2000

Directional effects in photonic bandgap cavities

Romuald Houdré, Ursula Oesterle

We present here measurements on hexagonal cavities that have areas between 2.0 and 8.6 mu m/sup 2/. The 2D triangular lattice PBG mirrors are etched into a GaAs/AlGaAs waveguide heterostructure with 3 layers of InAs quantum dots at the centre of a 240 nm thick GaAs core. The photoluminescence of the InAs dots internally probes the cavity resonances and the small fraction of light that is scattered into air is collected and fed to an optical multichannel analyser. The hexagonal cavities defined by 2D photoni

1999

Germination et croissance de films minces de Pb(Zr, Ti)O3 sur silicium passivé et substrats métalliques

We have studied deposition by in-situ reactive sputtering of ferroelectric Pb(ZrxTi1-x)O3 (PZT) thin films on Pt and RuO2 electrodes, using temperatures in the 490-620°C range. Nucleation on the electrode was found to be of prime importance for the formation, texture and hence quality of the PZT films. In consequence, an important part of this work lies in the elaboration of appropriate electrodes. A detailed study and stabilisation of the electrodes on passivated silicon (Si-SiO2) led to the identification

EPFL1997

Hydration products of alkali activated slag cement

This paper presents some recent research on the microstructural development during alkaline activation of slag pastes. Pastes of different slags activated with a range of activators have been prepared and some preliminary results from the study of the pastes activated with sodium hydroxide and waterglass solutions are presented. X-ray diffraction (XRD), differential thermal analysis (DTA), backscattered electron (BSE) imaging of polished samples in the SEM coupled with X-ray microanalysis, and secondary ele

Pergamon-Elsevier Science Ltd1995

Magnetooptical Studies of Acceptors Confined in Gaas/Alxga1-Xas Quantum-Wells

Alfredo Pasquarello

A magneto-optical study of accepters in varying degrees of confinement in GaAs/Al-x Ga-l-x, As quantum wells (QW's) is presented. A model for the splitting of the acceptor bound exciton (BE) and the allowed BE transitions in the presence of a magnetic field is presented. Our experimental results for the acceptor BE emission agree with calculated g values for bound holes, e.g., g(3/2) = 0. 61 and g(1/2) = 0.35 for a 150-Angstrom-wide QW. Furthermore, the energy separation between the acceptor m(j) = +/-3/2 1

1994

A calorimetric study of microbial growth energetics

Urs von Stockar, Ian William Marison

Isothermal reaction calorimetry was employed on the bench scale to measure the enthalpy efficiency and O2 efficiency of growth of several microbial strains cultured on a range of substrates with varying degrees of redn. The obsd. values of these energetic efficiency factors agreed well with simple theor. predictions based solely on the degree of redn. of the substrates as independent variable. Calorimetry is thus shown to be a useful tool for investigations of microbial growth energetics. Measuring heat dis

1987

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Related publications (28)