BACKGROUND The effects of biological and physical factors on cognitive aging are widely studied. Less is known about the role of psychosocial factors such as stress and social relationships for cognitive functioning. METHODS Speakers in Session IV of the Summit focused on possible mechanisms linking social interactions and stressful experiences to cognitive changes with aging. RESULTS Eleva...

Conflict of interest: All authors are employees and equity holders in CogState Ltd, the company that develops and markets the CogSport computerised cognitive testing software.

We investigate topology changing processes in the WKB approximation of four dimensional quantum cosmology with a negative cosmological constant. As Riemannian manifolds which describe quantum tunnelings of spacetime we consider constant negative curvature solutions of the Einstein equation i.e. hyperbolic geometries. Using four dimensional polytopes, we can explicitly construct hyperbolic manif...

The dimensional changes of 4 types commercial luting cements after setting were examined in distilled water, using a developed thermal expansion testing apparatus. The measurements were carried out under three conditions: increasing temperature (from 37•Ž to 60•Ž), decreasing temperature (from 37•Ž to 10•Ž), and constant temperature (37•Ž). The results indicated that: (1) the zinc phosphate cem...

Previous studies have indicated that acid glucose-citrate solutions provide the best preservation available at the present time (1). The mixture proposed by Loutit and Mollison (2, 3), conventionally called ACD-I in the United States, has been most extensively studied and appears unsurpassed in its preservative qualities. It is added in amounts of 25 ml. per 100 ml. of blood. The study to be re...

February 3, 1998 Topology Changes in (2+1)-Dimensional Quantum Gravity Yoshihisa FUJIWARA, Saburo HIGUCHI1 , Akio HOSOYA2 , Takashi MISHIMA3 and Masaru SIINO Department of Physics, Tokyo Institute of Technology, Oh-Okayama Meguro-ku, Tokyo 152, Japan ABSTRACT We study topology changing processes in (2+1)-dimensional quantum gravity with negative cosmological constant. By playing the `gluing-man...

In this paper, the oscillating two-dimensional laminar flow about a cylinder and the oscillation of a cylinder in still water are studied. A finite volume method is applied to solve the Navier Stokes equations using SIMPLEC algorithm on a body fitted co-located O-type grid. In this study, the non-dimensional flow numbers, Keulegan-Carpenter and Stokes’ numbers are chosen over a range where diff...