14,241 research outputs found
Remote sensing X-ray spectrometer
Spectrometer measures chemical composition of lunar rocks by remote sensing from orbit and senses lunar X-rays produced by interaction of solar X-rays and elements on the lunar surface. Instrument features high sensitivity, data handling system that accumulates and prepares data for telemetry, and automatic calibration
Comment about pion electro-production and the axial form factors
The claim by Haberzettl (Phys.Rev.Lett.85 (2000) 3576) that the axial form
factor of the nucleon cannot be accessed through threshold pion
electroproduction is unfounded
Seasonal Emergence Patterns of Black Flies (Diptera: Simuliidae) in Northwestern Pennsylvania
A two-year emergence trap study of black flies at four sites in northwestern Pennsylvania yielded 1%3 individuals of nine species. The collections included Prosimulium mixtum, P. jU5cum, Stegapterna mutata, Simulium aureum, S. excisum (recorded for the first time from Pennsylvania), S. gauldingi, S. sp. nr. innacens, S. vittatum, and S. tuberasum. Species richness for all sites peaked during May. Emergence collections below a sewage plant effluent outfall represented fewer individuals and species than collections above the effluent outfall. Chromosomal analysis of supplementary larval collections revealed the IIIL-l and IS-7 sibling species of S. vittatum and the FG sibling of S. tuberasum
An Energy-Minimization Finite-Element Approach for the Frank-Oseen Model of Nematic Liquid Crystals: Continuum and Discrete Analysis
This paper outlines an energy-minimization finite-element approach to the
computational modeling of equilibrium configurations for nematic liquid
crystals under free elastic effects. The method targets minimization of the
system free energy based on the Frank-Oseen free-energy model. Solutions to the
intermediate discretized free elastic linearizations are shown to exist
generally and are unique under certain assumptions. This requires proving
continuity, coercivity, and weak coercivity for the accompanying appropriate
bilinear forms within a mixed finite-element framework. Error analysis
demonstrates that the method constitutes a convergent scheme. Numerical
experiments are performed for problems with a range of physical parameters as
well as simple and patterned boundary conditions. The resulting algorithm
accurately handles heterogeneous constant coefficients and effectively resolves
configurations resulting from complicated boundary conditions relevant in
ongoing research.Comment: 31 pages, 3 figures, 3 table
High Temperature Expansion Study of the Nishimori multicritical Point in Two and Four Dimensions
We study the two and four dimensional Nishimori multicritical point via high
temperature expansions for the distribution, random-bond, Ising model.
In we estimate the the critical exponents along the Nishimori line to be
, . These, and earlier estimates
, are remarkably close to the critical
exponents for percolation, which are known to be , in
and and in . However, the
estimated Nishimori exponents , , are
quite distinct from the percolation results ,
.Comment: 5 pages, RevTex, 3 postscript files; To appear in Physical Review
Introduction, Sypmosium Common Law Environmental Protection
Is the common law a viable means of addressing environmental problems? The first wave of environmental common law scholarship, together with the law and economics and classical liberal literatures, at least put the issue on the table for discussion. The response from the critics raised some important criticisms, ones that needed to be answered. Whatever the failings of the environmental regulatory state, the common law has failings of its own, including the failure to protect many ecological resources in the period before the enactment of federal environmental law. In some instances administrative regulation may have hampered or sabotaged common law protections, but in others the common law failed on its own.
With the generous support of the Roe Foundation for the Property and Environment Research Center, we sought to expand the literature beyond the first round of discussion and to prompt a serious look at the common law\u27s potential, and potential weaknesses, in addressing environmental problems. We wanted to know where the case for the common law stood. The result is the set of articles and comments by the impressive group of authors included in this symposium
- …