The saturation nonlinearity of the retinal light response in human was measured by a psychophysical technique in which the adaptive gain control mechanism was clamped by the presence of a fixed surround in a small (7') foveal test field. Gain clamping was established by showing that the normal variation in temporal summation properties with test intensity was abolished in the gain clamping para...

This paper is concerned with solution procedures for the p-median problem: the wellestablished heuristic of Teitz and Bart, and the GRIA (Global/Regional Interchange Algorithm) technique developed more recently by Densham and Rushton. A computational scheme is presented which facilitates efficient implementations in both cases. The mathematical basis for the computational scheme is explained co...

this paper focuses on using the recently developed extended finite element model for buckling analysis of edge cracked columns under concentric axial load. the effect of crack depth and its location on the carrying capacity of columns is studied. the effect of different boundary conditions is also investigated. numerical examples are offered to show the efficiency and effectiveness of the propo...

In this paper we emphasize a similarity between the Logarithmic-Type Image Processing (LTIP) model and the Naka-Rushton model of the Human Visual System (HVS). LTIP is a derivation of the Logarithmic Image Processing (LIP), which further replaces the logarithmic function with a ratio of polynomial functions. Based on this similarity, we show that it is possible to present an unifying framework ...

In this paper, the data assembled concerning the agitation of a Newtonian fluid in a cylindrical vessel is disclosed. The stirred vessel is not provided with baffles and has a flat-bottom. The data presents some information on the characteristics of two impellers: a six-blade Rushton turbine and a six-blade paddle impeller. The flow patterns generated by both impellers are depicted and compared...

Monograph Working Group Members M Kogevinas (Spain)—Meeting Chair; M L Larramendy (Argentina); B W Stewart (Australia); T Sanderson (Canada); P Guénel (France); P Cocco (Italy); S Fukushima (Japan); ME Cebrian Garcia [unable to attend]; L T Lopez Carrillo (Mexico); R Vermeulen (Netherlands); S Naidoo (South Africa); T Prapamontol (Thailand); F L Martin [unable to attend]; L Rushton (UK); M Alav...

ichael Levin’s long-awaited book on race has finally arrived, every bit as powerful and insightful as his admirers had hoped it would be. Why Race Matters does exactly what the title promises—it removes all illusions about the insignificance of race, and explains what racial differences mean for a multi-racial society. It is a thorough, overwhelmingly convincing treatment of America’s most seri...

With progressively brighter stimuli, the amplitude of the photopic b-wave first increases, briefly saturates and then decreases gradually to reach a plateau, where the amplitude of the b-wave equals that of the a-wave; a phenomenon previously presented as the photopic hill. The unique presentation of this luminance-response function seriously complicates its analysis with curve fitting equation...