Ontological aspects of the Casimir Effect

The role of the vacuum, in the Casimir Effect, is a matter of some dispute: the Casimir force has been variously described as a phenomenon resulting "from the alteration, by the boundaries, of the zero-point electromagnetic energy", or a "Van der Waals force between the metal plates" that can be "computed without reference to zero point energies". Neither of these descriptions are grounded in a consistently quantum mechanical treatment of matter interacting with the electromagnetic field. However, the Casimir Effect has been canonically described within the framework of macroscopic quantum electrodynamics. On this account, the force is seen to arise due to the coupling of fluctuating currents to the zero-point radiation, and it is in this restricted sense that the phenomenon requires the existence of zero-point fields. The conflicting descriptions of the Casimir Effect, on the other hand, appear to arise from inadequate ontologies in which an unwarranted metaphysical priority is assigned either to the matter or the fields. Such ontological errors may have a direct bearing on the problem of the cosmological constant and the correct prediction of the Casimir force in a state of thermal equilibrium.Comment: 6 page

A normal paranoia? The emergence of distrust between parents of autistic children and public officials

This paper explores the development of distrust and paranoia among parents and carers of autistic children in their interactions with public officials charged with such children’s diagnosis, education and care. The suspicion and distrust framework of Fein and Hilton (1994), and Kramer’s typology of organisational paranoia (1998, 2001) are used to show how distrust impacts on client experiences. Antecedents of distrust are identified, and the ‘normalcy’ of paranoia in this context is demonstrated. These findings should permit public sector staff dealing with parents and carers of autistic children to address such perceptions and build trust where little seems to exist

Product market reform and innovation in the EU

European Union countries have implemented widespread reforms to productmarkets in order to stimulate competition, innovation and economic growth. We provideempirical evidence that the reforms carried out under the EU Single Market Programme(SMP) were associated with increased product market competition, as measured by areduction in average profitability, and with a subsequent increase in innovation intensityand productivity growth for manufacturing sectors. In our analysis we exploit exogenousvariation in the expected impact of the SMP across countries and industries to identify theeffects of reforms on average profitability, and the effects of profitability on innovationand productivity growth. European Union countries have implemented widespread reforms to productmarkets in order to stimulate competition, innovation and economic growth. We provideempirical evidence that the reforms carried out under the EU Single Market Programme(SMP) were associated with increased product market competition, as measured by areduction in average profitability, and with a subsequent increase in innovation intensityand productivity growth for manufacturing sectors. In our analysis we exploit exogenousvariation in the expected impact of the SMP across countries and industries to identify theeffects of reforms on average profitability, and the effects of profitability on innovationand productivity growth

Experimental measurements of unsteady turbulent boundary layers near separation

Investigations conducted to document the behavior of turbulent boundary layers on flat surfaces that separate due to adverse pressure gradients are reported. Laser and hot wire anemometers measured turbulence and flow structure of a steady free stream separating turbulent boundary layer produced on the flow of a wind tunnel section. The effects of sinusoidal and unsteadiness of the free stream velocity on this separating turbulent boundary layer at a reduced frequency were determined. A friction gage and a thermal tuft were developed and used to measure the surface skin friction and the near wall fraction of time the flow moves downstream for several cases. Abstracts are provided of several articles which discuss the effects of the periodic free stream unsteadiness on the structure or separating turbulent boundary layers