Cauchy horizon stability in self-similar collapse: scalar radiation

The stability of the Cauchy horizon in spherically symmetric self-similar collapse is studied by determining the flux of scalar radiation impinging on the horizon. This flux is found to be finite.Comment: 10 pages. To appear in Phys Rev

Evaluating the genetic progress of wheat in NSW, 1992-2009

Intellectual Property Regimes (IPRs) have been justified on the basis that they promote innovation, but it is not always clear that they do so. Empirical studies of IPRs in an Australian context have been limited. Plant variety protection is one form of IPR. The passing of the Australian Plant Breeder’s Rights Act of 1994 has been followed by significant commercialisation of the wheat breeding industry. The purpose of this paper is to consider whether this commercialisation has benefited wheat productivity through varietal improvement. We estimate a linear crop production function, using a random effects Hausman Taylor estimator to evaluate differences in genetic contributions to productivity between public and private wheat varieties commercially released in NSW over the period 1992-2009 using crop varietal data. Results from the Hausman Taylor estimator show that private varieties, on average, have outperformed public varieties over the period, suggesting that Plant Breeder’s Rights has promoted productive innovation in wheat. However, when we consider the best performing genetics of the varieties, public varieties have, in some years, outperformed privately bred varieties.genetic change, technical change, innovation, wheat breeding, intellectual property, Crop Production/Industries, Research and Development/Tech Change/Emerging Technologies,

Colorado climate summary water-year series: January 1977-September 1977, October 1977-September 1978

December 1978.Annual

Colorado climate summary water-year series: October 1979-September 1980

December 1980.Annual

Colorado climate summary water-year series: (October 1982-September 1983)

March 1984.Annual

Colorado climate summary water-year series: October 1993-September 1994

December 1994.Annual

Gauge invariant perturbations of self-similar Lema\^itre-Tolman-Bondi spacetime: even parity modes with l≥2l\geq 2

In this paper we consider gauge invariant linear perturbations of the metric and matter tensors describing the self-similar Lema\^itre-Tolman-Bondi (timelike dust) spacetime containing a naked singularity. We decompose the angular part of the perturbation in terms of spherical harmonics and perform a Mellin transform to reduce the perturbation equations to a set of ordinary differential equations with singular points. We fix initial data so the perturbation is finite on the axis and the past null cone of the singularity, and follow the perturbation modes up to the Cauchy horizon. There we argue that certain scalars formed from the modes of the perturbation remain finite, indicating linear stability of the Cauchy horizon.Comment: 16 pages, 4 figure

Colorado climate summary water-year series: October 1984-September 1985

June 1986.Annual

Colorado climate summary water-year series: October 1990-September 1991

October 1992.Annual

Climate of Fort Collins, Colorado: the year in review: 1992 water year, 1 October 1991-30 September 1992, The

December 1992.Includes bibliographical references (page 17).Fort Collins Weather Station funded by the Colorado Agricultural Experiment Station