4,579 research outputs found
Air Pollution and Mortality for 60 US Cities in 1960
No full textData includes measurements on mortality rate and explanatory variables(air-pollution, socio-economic and meteorological) for 60 US cities in 1960. This data was originally published in McDonald, G.C. and Schwing,R.C. (1973) 'Instabilities of regression estimates relating air pollution to mortality', Technometrics, vol.15, 463-482. It was redistributed through Carnegie Mellon University's StatLib (lib.stat.cmu.edu
G.C. Smith\u27s 1880 Cookbook, Columbia, S.C. (Part 1 of 4)
No full textThis cookbook created and maintained by G.C. Smith circa 1880 in Columbia, S.C. contains recipes and instructions for making various dishes and drinks, including desserts, cakes, puddings, biscuits, breads, etc.
For convenient viewing and download, this digitized manuscript has been divided into 4 PDFs.https://digitalcommons.wofford.edu/smith-cookbook/1000/thumbnail.jp
Draft transcription of the G.C. Smith\u27s 1880 Cookbook
No full textThis is a working transcription of the handwritten content within G.C. Smith\u27s 1880 cookbook. Mistakes and omissions remain in the current version (1 November 2016).https://digitalcommons.wofford.edu/smith-cookbook/1004/thumbnail.jp
G.C. Smith\u27s 1880 Cookbook, Columbia, S.C. (Part 4 of 4)
No full texthttps://digitalcommons.wofford.edu/smith-cookbook/1003/thumbnail.jp
G.C. Smith\u27s 1880 Cookbook, Columbia, S.C. (Part 2 of 4)
No full texthttps://digitalcommons.wofford.edu/smith-cookbook/1001/thumbnail.jp
Tunable down-conversion from an optical parametric oscillator
No full textA new method for the production of high power, tunable laser-like infrared radiation is described. An optical parametric oscillator (OPO) and a down-converter are combined so that radiation is generated at the frequency difference between signal and idler frequencies. In an experiment using proustite for the down-converter crystal and a 1.065µm pumped OPO, tunable radiation has been produced over the range 8-12µm. Using CdSe in the down-converter the region 10-25µm could be spanned with peak powers approaching 100W
Impact of hydrographic data assimilation on the modelled Atlantic meridional overturning circulation
No full textHere we make an initial step toward the development of an ocean assimilation system that can constrain the modelled Atlantic Meridional Overturning Circulation (AMOC) to support climate predictions. A detailed comparison is presented of 1° and 1/4° resolution global model simulations with and without sequential data assimilation, to the observations and transport estimates from the RAPID mooring array across 26.5° N in the Atlantic. Comparisons of modelled water properties with the observations from the merged RAPID boundary arrays demonstrate the ability of in situ data assimilation to accurately constrain the east-west density gradient between these mooring arrays. However, the presence of an unconstrained "western boundary wedge" between Abaco Island and the RAPID mooring site WB2 (16 km offshore) leads to the intensification of an erroneous southwards flow in this region when in situ data are assimilated. The result is an overly intense southward upper mid-ocean transport (0–1100 m) as compared to the estimates derived from the RAPID array.
Correction of upper layer zonal density gradients is found to compensate mostly for a weak subtropical gyre circulation in the free model run (i.e. with no assimilation). Despite the important changes to the density structure and transports in the upper layer imposed by the assimilation, very little change is found in the amplitude and sub-seasonal variability of the AMOC. This shows that assimilation of upper layer density information projects mainly on the gyre circulation with little effect on the AMOC at 26° N due to the absence of corrections to density gradients below 2000 m (the maximum depth of Argo).
The sensitivity to initial conditions was explored through two additional experiments using a climatological initial condition. These experiments showed that the weak bias in gyre intensity in the control simulation (without data assimilation) develops over a period of about 6 months, but does so independently from the overturning, with no change to the AMOC. However, differences in the properties and volume transport of North Atlantic Deep Water (NADW) persisted throughout the 3 year simulations resulting in a difference of 3 Sv in AMOC intensity. The persistence of these dense water anomalies and their influence on the AMOC is promising for the development of decadal forecasting capabilities. The results suggest that the deeper waters must be accurately reproduced in order to constrain the AMOC
On n-abelian groups and their generalizations
No full textFor any integer n
eq 0, 1, a group G is said to be n-abelian if it satisfies the identity (xy)^n = x^n y^n. More generally, G is called an Alperin group if it is n-abelian for some n
eq 0, 1. We consider two natural ways to generalize the concept of n-abelian group: the former leads to define n-soluble and n-nilpotent groups, the latter to define n-Levi and n-Bell groups. The main goal of this paper is to present classes of generalized n-abelian groups and to point out connections among them. Besides, Section 5 contains unpublished combinatorial characterizations for Bell groups and for Alperin groups. Finally, in Section 6 we mention results of arithmetic nature
Key Findings from recent literature on Computer-aided Assessment
No full textA perusal of the literature on Computer-aided Assessment (CAA) yields a rich crop of case studies and ‘should-do’s. This paper gathers together the key findings and common themes found in a search of recent papers published on CAA implementation, including some projects under the Teaching and Learning Technology Programme (TLTP) and the Fund for the Development of Teaching and Learning (FDTL) projects. It is hoped that this review will provide a valuable snapshot of current practice in CAA across different subject disciplines and a distillation of some of the key commonalities.
Initial findings indicate that barriers to embedding CAA in institutions include a lack of commitment at a strategic level, and as well as barriers in terms of cultural or pedagogical issues, rather more than any technical shortcomings in the CAA system. Furthermore, computer-assisted assessment in general is often still something of an add-on, and is not yet fully integrated into other learning and teaching practices. Technical and cultural barriers to the adoption of CAA were found to vary between subject boundaries (CAA Centre, 2001). The enablers to successful embedding of CAA in institutions include institutional commitment together with provision of adequate funds, time and personnel (Bull, 2002), frequent communication between the various stakeholders (Raine, 1999), interoperability and the existing availability of a Virtual Learning Environment (VLE) (Stevenson et al., 2001)
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