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Leverage cross sections more than a few years apart differ markedly, with similarities evaporating as the time between cross sections lengthens. Many firms have high and low leverage at different times, but few keep debt-to-assets ratios consistently above 0.500. Capital-structure stability is the exception, not the rule, occurs primarily at low leverage,(More)
In this paper we present an in-depth description of the Quadrics interconnection network (QsNET) and an experimental performance evaluation on a 64-node AlphaServer cluster. We explore several performance dimensions and scaling properties of the network by using a collection of benchmarks, based on different traffic patterns. Experiments with permutation(More)
Flows of complex fluids need to be understood at both macroscopic and molecular scales, because it is the macroscopic response that controls the fluid behavior, but the molecular scale that ultimately gives rise to rheological and solid-state properties. Here the flow field of an entangled polymer melt through an extended contraction, typical of many(More)
As the use of local area After exploring various networks (LANs) continues alternatives to second-to grow at an exponential generation local area rate, many large networks networks (LANs), with Ethernet backbones Digital selected the are reaching their usable fiber distributed data capacity. In addition, interface (FDDI) system. the explosion in the FDDI(More)
Produced by the Met Office © Crown copyright 2004 04/0207 Met Office and the Met Office logo are registered trademarks Summary The Hadley Centre has developed a method to estimate the uncertainty in climate models, the largest source of uncertainty in climate predictions over the next 50 years. Preliminary results suggest that: � the most likely global(More)
A new method is presented for the extraction of single-chain form factors and interchain interference functions from a range of small-angle neutron scattering (SANS) experiments on bimodal homopolymer blends. The method requires a minimum of three blends, made up of hydrogenated and deuterated components with matched degree of polymerization at two(More)
Laboratory-based wireless testbeds are essential for performing repeatable experiments with experimental protocols and devices. Several many-to-many wireless emulators have been proposed and built, but existing systems still rely on simplified channel models, such as free-space path loss, or general stochastic fading models. We have begun using(More)