Color constancy depends on sensitivity to change in both illumination spectral properties and object position. We investigated this latter form of color constancy by asking a cerebral achromatopsic to name the colors of papers that were presented atop black, gray or white backgrounds under identical illumination. Comparison of color names across background conditions reveals poor constancy, cha...

In the recent preprint [1] S. Parrott proves the equality between the Arveson's curvature and the Fredholm index of a " pure " contraction with finite defect numbers. In the present note one derives a similar formula in the " non-pure " case. The notions of d-contraction T = (T 1 , T 2 ,. .. , T d) and its curvature was introduced by W. Arveson in a series of papers (see [2], [3], and [4]). In ...

Lorch 2003, as quoted by International Symposium (2007), suggests that the focus of the construction industry has been on the ‘know-how’ rather than the ‘knowwhy’. This bias towards the ‘know-how’ may be the cause for construction’s deficiency in theories (Koskela and Howard 2002a, b). It is argued that in construction “there is a generalized failure to explore the behavioural, environmental an...

This paper has a two-fold purpose: first, to present the signs and symptoms of atrial septal defect and thus outline the findings that help in making the clinical diagnosis, and secondly, to show that correct and early diagnosis is important, because this anomaly gives rise to serious, although frequently obscured, symptoms and disabilities more often than has been generally realized. Clinicall...