Recasting results in equivariant geometry: affine cosets, observable subgroups and existence of good quotients

Using the language of stacks, we recast and generalize a selection of results in equivariant geometry

Thirty Years of Turnstiles and Transport

To characterize transport in a deterministic dynamical system is to compute exit time distributions from regions or transition time distributions between regions in phase space. This paper surveys the considerable progress on this problem over the past thirty years. Primary measures of transport for volume-preserving maps include the exiting and incoming fluxes to a region. For area-preserving maps, transport is impeded by curves formed from invariant manifolds that form partial barriers, e.g., stable and unstable manifolds bounding a resonance zone or cantori, the remnants of destroyed invariant tori. When the map is exact volume preserving, a Lagrangian differential form can be used to reduce the computation of fluxes to finding a difference between the action of certain key orbits, such as homoclinic orbits to a saddle or to a cantorus. Given a partition of phase space into regions bounded by partial barriers, a Markov tree model of transport explains key observations, such as the algebraic decay of exit and recurrence distributions.Comment: Updated and corrected versio

Stamping it out: Standardisation of book servicing and improvements to processing within Leeds Beckett University Library

This article describes several improvements which were made to the processing of new book stock received at Leeds Beckett University Libraries. It describes the background which necessitated these changes, how they were implemented, and the measured outcomes

Damages: Expert Witnesses

In the language of the Federal Rules of Evidence, an expert is one who possesses scientific, technical, or other specialized knowledge [that] will assist the trier of fact to understand the evidence or to determine a fact in issue. \u27 When the jury is sorting through evidence and conflicting party claims on disputed issues, such persons are potentially useful sources of information. At the same time, attorneys\u27 widespread use of expert witnesses has troublesome aspects. To the chagrin of some, expert witnesses have come to dominate civil trials, particularly those involving technical issues where large amounts of money are at risk. The Sabia case is just such a case. As would be expected, experts dominate the litigation. This portion of the symposium will discuss the role of experts and their interaction with the attorneys who hire them, as well as the attorneys who prepare to cross-examine them