\u3cem\u3eThe U-Boat Hunters: The Royal Canadian Navy and the Offensive Against Germany’s Submarines\u3c/em\u3e by Marc Milner [Review]

Review of Marc Milner, The U-Boar Hunters: The Royal Canadian Navy and the Offensive Against Germany\u27s Submarines. Toronto: University of Toronto Press, 1994

Configuration Interaction calculations of positron binding to Be(3Po)

The Configuration Interaction method is applied to investigate the possibility of positron binding to the metastable beryllium (1s^22s2p 3Po) state. The largest calculation obtained an estimated energy that was unstable by 0.00014 Hartree with respect to the Ps + Be^+(2s) lowest dissociation channel. It is likely that positron binding to parent states with non-zero angular momentum is inhibited by centrifugal barriers.Comment: 12 pages, 2 figures, Elsevier tex format, In press Nucl.Instrum.Meth.Phys.Res.B positron issu

A BARGAINING FRAMEWORK FOR THE GLOBAL COMMONS

The global commons represents a class of environmental problems that require international cooperation. Global environmental problems arise because the actions of some individuals or governments in one location hold serious implications for individuals and governments in other locations. There are global environmental policy problems because adversely-affected individuals (and governments) attempt to alter the behaviors of those responsible for global pollution. We develop a framework with which to analyze such global environmental problems. Our goal is to craft a resource management policy that will satisfy both those who seek a change and those who prefer the current situation. This environmental incentive policy will align the interests of the two parties. Incentive alignment is the policy problem in the global commons. That is, we must find ways to align interests through realigning incentives for individual and group behaviors.Environmental Economics and Policy,

Land Use Policy as Volitional Pragmatism

Land-use conflicts highlight several myths about property rights. The central myth is that property rights are linked to natural rights, that property rights are durable and unchanging, and that any interference with these property rights requires public compensation. However, particular settings and circumstances lead to conflicting rights claims which the courts must sort through to determine where the more compelling rights claim resides. Situations are not protected because they have property rights. Rather, those situations found worthy of protection by the courts acquire the status of a property right. Property rights are not discovered, but are created by the courts. Applied economists must build models of property rights conflicts predicated upon an epistemology of volitional pragmatism.Land Economics/Use,

A nurse-led sleep service for children and young people with disability

Aim: To evaluate the outcomes from a nurse-led, community-based sleep hygiene service for children and young people, which was designed and implemented in a community NHS trust. The project aimed to provide evidence for wider implementation of such a service across the trust. Method: The project recruited 22 participants to an eight-week programme over six months and collected quantitative and qualitative data. It included evaluating service costs and collecting information about how the child’s sleep problem affected the carer and family pre- and post-intervention. Findings: There was a significant, positive effect on quality-of-life measures, with two thirds of participants achieving 40% of their expectations by the end of the eight weeks. Parents said they felt ‘less helpless’ and they valued the support given in the home setting. Conclusion: Cost and benefit analysis showed that the service could reduce costs associated with high-cost prescriptions. It could also positively affect community paediatric waiting lists and clinic appointments

Numerical Simulations of Collisional Cascades at the Roche Limits of White Dwarf Stars

We consider the long-term collisional and dynamical evolution of solid material orbiting in a narrow annulus near the Roche limit of a white dwarf. With orbital velocities of 300 km/sec, systems of solids with initial eccentricity $e \gtrsim 10^{-3}$ generate a collisional cascade where objects with radii $r \lesssim$ 100--300 km are ground to dust. This process converts 1-100 km asteroids into 1 $\mu$m particles in $10^2 - 10^6$ yr. Throughout this evolution, the swarm maintains an initially large vertical scale height $H$. Adding solids at a rate $\dot{M}$ enables the system to find an equilibrium where the mass in solids is roughly constant. This equilibrium depends on $\dot{M}$ and $r_0$, the radius of the largest solid added to the swarm. When $r_0 \lesssim$ 10 km, this equilibrium is stable. For larger $r_0$, the mass oscillates between high and low states; the fraction of time spent in high states ranges from 100% for large $\dot{M}$ to much less than 1% for small $\dot{M}$. During high states, the stellar luminosity reprocessed by the solids is comparable to the excess infrared emission observed in many metallic line white dwarfs.Comment: 37 pages of text, 12 figures, ApJ, accepte