III Two types of III-V diode lasers have been developed for new emission wavelengths. We have obtained emission at 0.9 to 1.06 Jim nom quantum-well lasers with a strained InGaAs active layer and AlGaAs confining layers. Organometallic vapor phase epitaxy (OMVPE) was used to grow the layers on GaAs substrates. These InGaAs/AlGaAs lasers have achieved threshold current densities as low as 65 Afcm...

In the literature, the nature of the relationships between memory processes and summary evaluations is still a debate. According to some theoretical approaches (e.g., “two-memory hypothesis”; Anderson, 1989) retrospective evaluations are based on the impression formed while attending to the to-beassessed stimuli (on-line judgment) – no functional dependence between information retrieval and jud...

1 Neil Audsley 2 Jim Austin 3 Iain Bate 4 Ian Benest 5 Adrian Bors 6 Sam Braunstein 7 Alan Burns 8 Ana Cavalcanti 9 James Cussens 10 Alistair Edwards 11 Edwin Hancock 12 Dimitar Kazakov 13 Gerald Luettgen 14 John McDermid 15 Simon O'Keefe 16 Richard Paige 17 Nick Pears 18 Detlef Plump 19 Fiona Polack 20 Colin Runciman 21 Susan Stepney 22 John Timmis 23 Andy Wellings 24 Richard Wilson 25 Jim Woo...

a disk wang-bézier type generalized ball curve is a wang-bézier type generalized ball curve whose control points are disks in a plane. it can be viewed as a parametric curve with error tolerances. in this paper, we discuss the problem of degree reduction of disk wang-bézier type generalized ball curve, that is, bounding disk wang-bézier type generalized ball curves with lower degree disk wang-b...

A disk Wang-Bézier type generalized Ball curve is a Wang-Bézier type generalized Ball curve whose control points are disks in a plane. It can be viewed as a parametric curve with error tolerances. In this paper, we discuss the problem of degree reduction of disk Wang-Bézier type generalized Ball curve, that is, bounding disk Wang-Bézier type generalized Ball curves with lower degree disk Wa...

Consider the Newtonian potential of a homogeneous bounded body D ⊂ R3 with known constant density and connected complement. If this potential equals to c/|x| in a neighborhood of infinity, where c > 0 is a constant, then the body is a ball. This known result is now proved by a different simple method. The method can be applied to other problems.