29,252 research outputs found

    Units of Evidence for Analyzing Subdisciplinary Difference in Data Practice Studies

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    Digital libraries (DLs) are adapting to accommodate research data and related services. The complexities of this new content spans the elements of DL development, and there are questions concerning data selection, service development, and how best to align these with local, institutional initiatives for cyberinfrastructure, data-intensive research, and data stewardship. Small science disciplines are of particular relevance due to the prevalence of this mode of research in the academy, and the anticipated magnitude of data production. To support data acquisition into DLs – and subsequent data reuse – there is a need for new knowledge on the range and complexities inherent in practice-data-curation arrangements for small science research. We present a flexible methodological approach crafted to generate data units to analyze these relationships and facilitate crossdisciplinary comparisons.Library Services (LG-06-07-0032-07) and National Science Foundation (OCI-0830976).is peer reviewe

    Strong spectral evolution during the prompt emission of GRB 070616

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    Swift has revealed features in GRB early light curves, such as steep decays and X-ray flares, whose properties are consistent with an internal origin though they are far from understood. The steep X-ray decay is often explained using the curvature effect; however a significant number of GRBs display strong spectral evolution during this phase, and a new mechanism must be invoked to explain this. Of particular interest are the longest duration GRBs in which the early emission can be studied in most detail. Here we present data for GRB 070616, in which the prompt emission shows a complex multipeaked structure, leading to one of the longest prompt emission durations ever recorded. We take advantage of extensive coverage of such a long burst by all Swift instruments. Combining data from Swift and Suzaku we study the evolution of the prompt emission spectrum, following the temporal variability of the peak energy and spectral slope.Comment: 4 pages, 2 figures (Fig 1 in colour), contributed talk, submitted to the proceedings of Gamma Ray Bursts 2007, Santa Fe, New Mexico, November 5-9 200

    Extreme distributions of ground winds /3 to 150 meters/ at Cape Kennedy, Florida

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    Statistical analysis of wind distribution probabilities at Cape Kenned

    Yeast as a source of vitamine-B for the growth of rats

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    Oceanic stochastic parametrizations in a seasonal forecast system

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    We study the impact of three stochastic parametrizations in the ocean component of a coupled model, on forecast reliability over seasonal timescales. The relative impacts of these schemes upon the ocean mean state and ensemble spread are analyzed. The oceanic variability induced by the atmospheric forcing of the coupled system is, in most regions, the major source of ensemble spread. The largest impact on spread and bias came from the Stochastically Perturbed Parametrization Tendency (SPPT) scheme - which has proven particularly effective in the atmosphere. The key regions affected are eddy-active regions, namely the western boundary currents and the Southern Ocean. However, unlike its impact in the atmosphere, SPPT in the ocean did not result in a significant decrease in forecast error. Whilst there are good grounds for implementing stochastic schemes in ocean models, our results suggest that they will have to be more sophisticated. Some suggestions for next-generation stochastic schemes are made.Comment: 24 pages, 3 figure

    Oceanic stochastic parametrizations in a seasonal forecast system

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    We study the impact of three stochastic parametrizations in the ocean component of a coupled model, on forecast reliability over seasonal timescales. The relative impacts of these schemes upon the ocean mean state and ensemble spread are analyzed. The oceanic variability induced by the atmospheric forcing of the coupled system is, in most regions, the major source of ensemble spread. The largest impact on spread and bias came from the Stochastically Perturbed Parametrization Tendency (SPPT) scheme - which has proven particularly effective in the atmosphere. The key regions affected are eddy-active regions, namely the western boundary currents and the Southern Ocean. However, unlike its impact in the atmosphere, SPPT in the ocean did not result in a significant decrease in forecast error. Whilst there are good grounds for implementing stochastic schemes in ocean models, our results suggest that they will have to be more sophisticated. Some suggestions for next-generation stochastic schemes are made.Comment: 24 pages, 3 figure

    LANDOWNER ATTITUDES REGARDING PENNSYLVANIA\u27S EXTENDED ANTERLESS DEER SEASON ON DEER-DAMAGED FARMS

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    The Pennsylvania Game Commission authorized an extension of the 1990-1991 anterless white-tailed deer (Odocoileus virginianus) season to reduce deer abundance on farms having excessive crop damage. A mail survey of the 574 participating landowners was conducted to assess the effectiveness of the program. After 2 mailings 93% (n = 531) responded, and 444 returns had completed information for numbers of hunters, hectares, and harvested deer. Based on landowner responses, an estimated 2,674 deer were harvested by 35,181 hunters on 58,525 ha. An average of 4.6 deer were harvested/km2 of huntable land, which compared to a statewide estimate of f2.3 deer harvested/km2 during the 1990 4-day regular anterless-deer season. Twenty-four percent (n = 107) of respondents reported zero deer harvested. Twenty-five percent of respondents (n = 110) were satisfied with the program. Landowners who were dissatisfied (n = 331, 75%) could provide up to 5 reasons for dissatisfaction. Four hundred sixty-nine responses were provided. Three-hundred-forty-seven responses (74%) indicated too few deer were killed, while 23% (n = 106) indicated that the program was inconvenient. Satisfaction related to number and density of deer harvested, hectares of huntable land, perception of hunter density, and suggested improvements. Many respondents (n = 204, 46%)indicated they would participate again, in spite of the high degree of dissatisfaction. Number and density of deer harvested, density of hunters, perception of hunter density, satisfaction, and reason for dissatisfaction, were related to willingness to participate again. Landowner suggestions for improvements (5 allowed per respondent, n = 364 recieved) centered on harvesting more deer by involving more land (n = 201, 55%) and moving the timing of the season (n = 119, 33%). Seventy-two percent (n = 320) of responses (5 allowed per respondent, n = 625 recieved) indicated neighboring posted land was the primary reason for too many deer on their property. This remains the greatest challenge in providing relief from high deer densities
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