Paleoecology and Stratigraphy of Ordovician Carbonates, Mohawk Valley, New York

Guidebook for field trips in New York, Massachusetts and Vermont: 61st annual meeting at the State University of New York at Albany, Albany, New York October 10, 11, 12, 1969: Trip 1

Ozone depletion and chlorine loading potentials

The recognition of the roles of chlorine and bromine compounds in ozone depletion has led to the regulation or their source gases. Some source gases are expected to be more damaging to the ozone layer than others, so that scientific guidance regarding their relative impacts is needed for regulatory purposes. Parameters used for this purpose include the steady-state and time-dependent chlorine loading potential (CLP) and the ozone depletion potential (ODP). Chlorine loading potentials depend upon the estimated value and accuracy of atmospheric lifetimes and are subject to significant (approximately 20-50 percent) uncertainties for many gases. Ozone depletion potentials depend on the same factors, as well as the evaluation of the release of reactive chlorine and bromine from each source gas and corresponding ozone destruction within the stratosphere

Relative effects on global warming of halogenated methanes and ethanes of social and industrial interest

The relative potential global warming effects for several halocarbons (chlorofluorocarbons (CFC's)-11, 12, 113, 114, and 115; hydrochlorofluorocarbons (HCFC's) 22, 123, 124, 141b, and 142b; and hydrofluorocarbons (HFC's) 125, 134a, 143a, and 152a; carbon tetrachloride; and methyl chloroform) were calculated by two atmospheric modeling groups. These calculations were based on atmospheric chemistry and radiative convective models to determine the chemical profiles and the radiative processes. The resulting relative greenhouse warming when normalized to the effect of CFC-11 agree reasonably well as long as we account for differences between modeled lifetimes. Differences among results are discussed. Sensitivity of relative warming values is determined with respect to trace gas levels assumed. Transient relative global warming effects are analyzed

A global picture of quantum de Sitter space

Perturbative gravity about a de Sitter background motivates a global picture of quantum dynamics in `eternal de Sitter space,' the theory of states which are asymptotically de Sitter to both future and past. Eternal de Sitter physics is described by a finite dimensional Hilbert space in which each state is precisely invariant under the full de Sitter group. This resolves a previously-noted tension between de Sitter symmetry and finite entropy. Observables, implications for Boltzmann brains, and Poincare recurrences are briefly discussed.Comment: 17 pages, 1 figure. v2: minor changes, references added. v3: minor changes to correspond to PRD versio

Relative effects on stratospheric ozone of halogenated methanes and ethanes of social and industrial interest

Four atmospheric modeling groups have calculated relative effects of several halocarbons (chlorofluorocarbons (CFC's)-11, 12, 113, 114, and 115; hydrochlorofluorocarbons (HCFC's) 22, 123, 124, 141b, and 142b; hydrofluorocarbons (HFC's) 125, 134a, 143a, and 152a, carbon tetrachloride; and methyl chloroform) on stratospheric ozone. Effects on stratospheric ozone were calculated for each compound and normalized relative to the effect of CFC-11. These models include the representations for homogeneous physical and chemical processes in the middle atmosphere but do no account for either heterogeneous chemistry or polar dynamics which are important in the spring time loss of ozone over Antarctica. Relative calculated effects using a range of models compare reasonably well. Within the limits of the uncertainties of these model results, compounds now under consideration as functional replacements for fully halogenated compounds have modeled stratospheric ozone reductions of 10 percent or less of that of CFC-11. Sensitivity analyses examined the sensitivity of relative calculated effects to levels of other trace gases, assumed transport in the models, and latitudinal and seasonal local dependencies. Relative effects on polar ozone are discussed in the context of evolving information on the special processes affecting ozone, especially during polar winter-springtime. Lastly, the time dependency of relative effects were calculated

Mobile Melt-Dilute Technology Development Project FY 2005 Test Report

The adaptation of Melt-Dilute technology to a mobile and deployable platform progressed with the installation of the prototype air-cooled induction furnace and power generator in an ISO cargo container. Process equipment tests were conducted in FY’05 on two fronts: the melt container and its associated hardware and the mobile furnace and generator. Container design was validated through tests at elevated temperature and pressure, under vacuum, and subjected to impact. The Mobile Melt-Dilute (MMD) furnace and power source tests were completed per the plan. The tests provided information necessary to successfully melt and dilute HEU research reactor fuel assemblies

Radio astronomy

The following subject areas are covered: (1) scientific opportunities (millimeter and sub-millimeter wavelength astronomy; meter to hectometer astronomy; the Sun, stars, pulsars, interstellar masers, and extrasolar planets; the planets, asteroids, and comets; radio galaxies, quasars, and cosmology; and challenges for radio astronomy in the 1990's); (2) recommendations for new facilities (the millimeter arrays, medium scale instruments, and small-scale projects); (3) continuing activities and maintenance, upgrading of telescopes and instrumentation; (4) long range programs and technology development; and (5) social, political, and organizational considerations

The Academic Profession in Canada: Perceptions of Canadian University Faculty about Research and Teaching

Previous scholarly attention to the experiences of faculty members has emphasized the contexts of US institutions, with minimal attention to the experiences of faculty members at Canadian universities.  This paper presents the findings of the Canadian component of an international survey that was administered in 19 different jurisdictions to understand the perceptions of faculty members about the nature and scope of changes to academic work. As such, the paper explores the perceptions on research and teaching of full-time faculty members affiliated with Canadian universities. Overall, faculty members revealed that Canadian universities have strong, engaging, and vibrant research and teaching environments, yet there are also areas for improvement. Specifically, findings showed that faculty members perceived considerable autonomy with respect to research activities, despite the increasing need to secure external funding for research. Also, faculty expressed substantial commitment to teaching undergraduate students but a lack of clarity about some issues related to graduate teaching. The survey results provide an important baseline for future studies of Canadian universities and the working conditions of the professoriate in a time of rapid institutional and professional change.  Jusqu’à présent, les études scientifiques sur l’expérience du corps professoral ont surtout porté sur le contexte étatsunien, accordant très peu d’attention à l’expérience vécue dans les universités canadiennes. Cet article présente les résultats de la partie canadienne d’un sondage international effectué dans 19 juridictions, et dont le but était de comprendre la perception du corps professoral envers la nature et la portée de changements modifiant le travail académique. Dans l’ensemble, les membres du corps professoral ont confié que le milieu de la recherche et de l’enseignement est solide, stimulant et dynamique, bien que des points restent à améliorer. Plus précisément, notre recherche révèle que les membres du corps professoral perçoivent une autonomie considérable sur le plan des activités de recherche, malgré le besoin grandissant d’obtenir du financement externe pour la recherche. De plus, les membres du corps professoral ont exprimé leur engagement capital envers l’enseignement au premier cycle, mais aussi un manque de clarté quant à certains problèmes liés à l’enseignement aux cycles supérieurs. Dans un contexte de changements institutionnels et professionnels rapides, les résultats du sondage fournissent un important point de départ pour de futures études sur les universités canadiennes et les conditions de travail du corps professoral