We study soft-gluon radiation in top quark decay within the framework of perturbative fragmentation functions. We present results for the b-quark energy distribution, accounting for soft-gluon resummation to next-to-leading logarithmic accuracy in both the MS coefficient function and in the initial condition of the perturbative fragmentation function. The results show a remarkable improvement a...

Marine diversity is currently one of the most studied topics in ecology especially under the frame of global and regional environmental changes. In the marine realm biodiversity declines from the tropics to the Arctic (Thorson 1957, Brattegard & Holthe 1997, Roy et al. 1996, 1998, Gray 2001). Habitat and environmental heterogeneity generally favour biodiversity; additionally, intermediate physi...

Since the pioneering attempts to obtain quantitative soft-bottom sediment samples at the beginning of this century, many different devices for sampling soft bottoms have been presented. Most techniques, however, yield semi-quantitative samples only. For studies dealing with certain aspects of microlayering, freezing in situ seems to be a good method. In more general studies, quantitative sample...

Oxygen deficiency in the near-bottom water associated with eutrophication has been shown to have negative impacts on marine benthos in many Scandinavian waters. In the present study, the benthic fauna and the sedimentary habitat have been studied between 7 and 34 m depth; at 14 stations in three Swedish fjords in four different years, and at 12 stations along the Swedish coast in three differen...

Lagoon soft-bottoms are key habitats within coral reef seascapes. Coral fish use these as nurseries, feeding grounds and transit areas. At present, most soft-bottom sampling methods destructive (trawling, longlining, hook line). We developed a remote, unbaited 360° video method (RUV360) to monitor species assemblages in soft bottoms. A low-cost, high-definition camera enclosed waterproof housin...

The cross section for bottom quark production at fixed-target energies is calculated for a wide range of beam momenta. A detailed analysis is given for the HERA-B experiment. We consider both the order α 3 s cross section and the resummation of soft gluon corrections in all orders of QCD perturbation theory. The inclusive transverse momentum and rapidity distributions, including resummation, fo...

This paper presents a new methodology for studying different accounts of project management practices based on network mapping and analysis. Drawing upon network mapping and visualization as an analytical strategy top-down and bottom-up accounts of project management practice are analysed and compared. The analysis initially reveals a substantial difference between the top-down and bottom-up ac...