Data were gathered from 45 doctoral students through focus groups, observations, and written and oral re ̄ ections to ascertain their perceptions of a speci® c teaching process (the Scholarly Writing Project), which was designed to assist these students in learning how to do academic writing. It was found that preparing and receiving critiques from professors and peers was perceived to be the mo...

In ESA's Infrared Space Interferometry mission, a multi-aperture interferometer fed by telescopes will serve to analyse exoplanets orbiting bright stars. Spectroscopy of the planet's radiation could give hints on the possibility of the existence of life. However, for a Sun/Earth-like constellation, a star light rejection ratio of some 80dB is required. This is the factor by which the star light...

This paper proposes a method for the identi cation of di erent partial discharges (PD) sources through the analysis of a collection of PD signals acquired with a PD measurement system. This method, robust and sensitive enough to cope with noisy data and external interferences, combines the characterization of each signal from the collection, with a clustering procedure, the CLARA algorithm. Sev...

CAPELLO R. (1999) Spatial transfer of knowledge in high technology milieux: learning versus collective learning processes, Reg. Studies 33, 353± 365. An analysis of the de® nitions provided so far in the literature shows ambiguities in the conceptualization of collective learning. A parallel analysis of the concepts of learning and collective learning is provided, and similarities and diVerence...

Constraint satisfaction problems have generally been recognized as a useful framework for many AI problems. Several notions of soft constraints have been suggested to infer uncertain knowledge as well as formulate optimization tasks. Additionally, the ability to represent optional requirements of experts on schedules or plans has been claimed by certain forms of soft constraints. In opposition ...

Iris masks are essential in iris recognition. The purpose of having a good iris mask is to indicate which part of iris texture map is useful and which part is occluded or contains noisy artifacts such as eyelashes, eyelids and specular re ections. The accuracy of the iris mask is extremely important. The performance of the iris recognition system will decrease dramatically when iris mask is ina...

A key challenge facing space-based computer vision systems is the presence of highly specular surfaces. Such surfaces present a challenge to conventional vision systems due to specular re ections, which may mask the true location of objects and lead to incorrect measurements. The problem is complicated by the fact that the use of high-powered illuminants, such as laser beams, can be problematic...

A theoretical analysis has been undertaken of the steady state transverse mode selection in Vertical Cavity Surface Emitting Lasers (VCSELs) subject to optical feedback in an external cavity connguration. Proper account is taken of multiple re-ections in the external cavity. The innuence of thermal eeects on the mode selection is also treated and noise properties of the connguration are discuss...

It is well known that for the simpler problem of constructing translation invariants of grey scale images (1D, 2D or 3D) central moments can be used. There are plain closed formulae expressing them in terms of the ordinary geometrical moments. Moreover, central moments are ordinary moments of the properly normalized image. In this paper we present moment invariants for the more involved problem...

We present a detailed numerical study of the interaction of a weak shock wave with an isolated cylindrical gas inhomogeneity. Such interactions have been studied experimentally in an attempt to elucidate the mechanisms whereby shock waves propagating through random media enhance mixing. Our study concentrates on the early phases of the interaction process which are dominated by repeated refract...