Etudes hydrobiologiques sur les eaux saumâtres de Belgique: VII. Le microplancton des eaux du Port d'Ostende. Période 1953-1954

In this work we studied some ecological factors and the floral composition of phytoplankton (micro plankton) during the 1953-1954 period. We measured successively: the temperature, the pH, the alkaline, the chlorine, the dissolved oxygen, the concentration of phosphates and nitrates. The water of the Ostend port passes the scale a-mesohaline to polyhaline. The sampling of the phytoplankton has been worked out one time or several times in a month. The Bacillariophyceae play an important role, the Dinophyceae are relatively rare, as the Chryosophyceae, and the Chlorophyceae are meeting during the whole year, with the exception of January, February and April, in little quantities, except for November. Dominant species are: Coscinodiscus continues, Biddulphia alternans, Coscinodiscus subtilis, Biddulphia regia, Asterionella japonica, Rhizosolenia setigaria, Biddulphia regia, Actinoptychus undulatus, Biddulphia Favus, Melosira Borreri. The are three species recorded during eight moths of the year: Scendesmus quadraicauda, Biddulphia rhombos, Biddulphia sinensis

Enhanced molecular dynamics performance with a programmable graphics processor

Design considerations for molecular dynamics algorithms capable of taking advantage of the computational power of a graphics processing unit (GPU) are described. Accommodating the constraints of scalable streaming-multiprocessor hardware necessitates a reformulation of the underlying algorithm. Performance measurements demonstrate the considerable benefit and cost-effectiveness of such an approach, which produces a factor of 2.5 speed improvement over previous work for the case of the soft-sphere potential.Comment: 20 pages (v2: minor additions and changes; v3: corrected typos