An Eye for Detail: the Dallard years

It is often considered that the 1930s was a mundane period in the history of New Zealand prison architecture. This paper re-evaluates this conclusion by examining the specific aspect of prison interior architecture and the incremental changes that occurred to prison buildings during this period of New Zealand's prison history

Note on counterterms in asymptotically flat spacetimes

We consider in more detail the covariant counterterm proposed by Mann and Marolf in asymptotically flat spacetimes. With an eye to specific practical computations using this counterterm, we present explicit expressions in general $d$ dimensions that can be used in the so-called `cylindrical cut-off' to compute the action and the associated conserved quantities for an asymptotically flat spacetime. As applications, we show how to compute the action and the conserved quantities for the NUT-charged spacetime and for the Kerr black hole in four dimensions.Comment: 13 pages, v. 2 added reference

Displaying 3D images: algorithms for single-image random-dot

A new, simple, and symmetric algorithm can be implemented that results in higher levels of detail in solid objects than previously possible with autostereograms. In a stereoscope, an optical instrument similar to binoculars, each eye views a different picture and thereby receives the specific image that would have arisen naturally. An early suggestion for a color stereo computer display involved a rotating filter wheel held in front of the eyes. In contrast, this article describes a method for viewing on paper or on an ordinary computer screen without special equipment, although it is limited to the display of 3D monochromatic objects. (The image can be colored, say, for artistic reasons, but the method we describe does not allow colors to be allocated in a way that corresponds to an arbitrary coloring of the solid object depicted.) The image can easily be constructed by computer from any 3D scene or solid object description

THE DESIGN, PRODUCTION AND ANALYSIS OF A REALISTIC STEREO CG SHORT FILM ON A SIX MONTH BUDGET.

The production of stereoscopic CG films poses some interesting challenges, especially for student productions that work under the severe limitations of time and resources. This is mainly due to the non availability of off the shelf production tools catering to stereoscopic CG productions. This work presents the production process of one such student produced stereoscopic short film. The production process is described in detail starting from the initial conception of the narrative plot to the actual production of the film. Finally an experimental technique of using eye tracking as a tool for finding out the effectiveness of the various stereoscopic framing techniques used in the film is presented. The feasibility of eye tracking as an effective tool for filmmakers in stereoscopic 3D to analyze the viewing behavior of the audience and to improve the film using that information is assessed. This paper first provides the basic background needed to understand the various terms related to stereoscopic 3D. Then it describes the custom stereoscopic pipeline that was implemented for the film, followed by an in depth description of the actual production process. Finally, the eye tracking experiment is described in detail and the analysis of the result is presented

Collider versus Cosmic Ray Sensitivity to Black Hole Production

In scenarios with extra dimensions and TeV-scale quantum gravity, black holes are expected to be produced copiously at center-of-mass energies above the fundamental Planck scale. The Large Hadron Collider (LHC) may thus turn into a factory of black holes, at which their production and evaporation may be studied in detail. But even before the LHC starts operating, the Pierre Auger Observatory for cosmic rays, presently under construction, has an opportunity to search for black hole signatures. Black hole production in the scattering of ultrahigh energy cosmic neutrinos on nucleons in the atmosphere may initiate quasi-horizontal air showers far above the Standard Model rate. In this letter, we compare the sensitivity of LHC and Auger to black hole production by studying their respective reach in black hole production parameter space. Moreover, we present constraints in this parameter space from the non-observation of horizontal showers by the Fly's Eye collaboration. We find that if the ultrahigh energy neutrino flux is at the level expected from cosmic ray interactions with the cosmic microwave background radiation, Auger has only a small window of opportunity to detect black holes before the start of the LHC. If, on the other hand, larger ultrahigh energy neutrino fluxes on the level of the upper limit from ``hidden'' hadronic astrophysical sources are realized in nature, then the first signs of black hole production may be observed at Auger. Moreover, in this case, the Fly's Eye constraints, although more model dependent, turn out to be competitive with other currently available constraints on TeV-scale gravity which are mainly based on interactions associated with Kaluza-Klein gravitons.Comment: 13 pages, 6 figures; references added and more emphasis on Fly's Eye constraints; version to appear in Phys. Lett.

Parity violation, anyon scattering and the mean field approximation

Some general features of the scattering of boson-based anyons with an added non-statistical interaction are discussed. Periodicity requirements of the phase shifts are derived, and used to illustrate the danger inherent in separating these phase shifts into the well-known pure Aharanov-Bohm phase shifts, and an additional set which arise due to the interaction. It is proven that the added phase shifts, although due to the non-statistical interaction, necessarily change as the statistical parameter is varied, keeping the interaction fixed. A hard-disk interaction provides a concrete illustration of these general ideas. In the latter part of the paper, scattering with an additional hard-disk interaction is studied in detail, with an eye towards providing a criterion for the validity of the mean-field approximation for anyons, which is the first step in virtually any treatment of this system. We find, consistent with previous work, that the approximation is justified if the statistical interaction is weak, and that it must be more weak for boson-based than for fermion-based anyons.Comment: 17 pages plus 3 encoded/compressed post-script figures, UdeM-LPN-TH-94-18