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SNAP Satellite Focal Plane Development

Description: The proposed SuperNova/Acceleration Probe (SNAP) mission will have a two-meter class telescope delivering diffraction-limited images to an instrumented 0.7 square degree field in the visible and near-infrared wavelength regime. The requirements for the instrument suite and the present configuration of the focal plane concept are presented. A two year R&D phase, largely supported by the Department of Energy, is just beginning. We describe the development activities that are taking place to a… more
Date: July 7, 2003
Creator: Bebek, C.; Akerlof, C.; Aldering, G.; Amanullah, R.; Astier, P.; Baltay, C. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Impact of Geoengineering Schemes on the Global Hydrological Cycle

Description: The rapidly rising CO{sub 2} level in the atmosphere has led to proposals of climate stabilization via 'Geoengineering' schemes that would mitigate climate change by intentionally reducing the solar radiation incident on earth's surface. In this paper, we address the impact of these climate stabilization schemes on the global hydrological cycle, using equilibrium simulations from an atmospheric general circulation model coupled to a slab ocean model. We show that insolation reductions sufficien… more
Date: December 7, 2007
Creator: Bala, G.; Duffy, P. & Taylor, K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Improving safety through root cause analysis

Description: Operations at the US Department of Energy -- Savannah River Site (SRS) include such diverse facilities as reactors, fuel fabrication, chemical processing, coal burning power houses, analytical laboratories and research facilities. To enhance the safety of operations at SRS, a Root Cause Analysis process has been developed and is discussed in this document. Root Cause Analysis is a three-step process designed to evaluate and correct problems by identifying WHY an occurrence happened. Although th… more
Date: December 31, 1991
Creator: Gatlin, J. L. & Taylor, K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Out-of-Pile Properties of Mixed Uranium-Plutonium Carbides. Progress Report, February 6, 1962-October 31, 1962

Description: Fabrication studies to produce high density solid solutions of 80% UC-- 20% RaC, with reproducible structure, composition, and density, were completed. Two types of material were produced: (U/sub 0.8/Pu/0.2/)C/sub 0.95/, single-phase monocarbide pellets with average densities of 12.8 g/cm/sup 3/ (94% of theoretical), sintered at 1950 deg C; and (U/sub 0.8/Pu/0.2/) C/sub 0.95/ + 0.1 wt% Ni sintering aid, major monocarbide and minor amount of sesquicarbide pellets, with average densities of 13.1 … more
Date: September 18, 1963
Creator: Strasser, A.; Stahl, D. & Taylor, K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Krakatau's long goodbye in the Ocean

Description: State-of-the-art climate models suggest that 20th Century ocean warming and sea-level rise were substantially reduced by the 1883 eruption of Krakatau. Volcanically induced cooling of the ocean surface penetrated into deeper layers where it persisted for decades. We find that volcanic eruptions have longer lasting effects than previously suspected, sufficient to offset a large fraction of ocean warming and sea-level rise caused by anthropogenic influences over the 20th Century. We examine the l… more
Date: December 15, 2005
Creator: Gleckler, P.; Wigley, T.; Santer, B.; Gregory, J.; AchutaRao, K. & Taylor, K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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CARBIDE FUEL DEVELOPMENT. Progress Report Period, February 1, 1961 to April 30, 1961

Description: Fuel Fabrication and Evaluation. Nearly stoichiometric, low nitrogen- content UC was synthesized in the plutonium glove box atmosphere. PuC and PuC- UC preparation studies were initiated by the oxide-carbon reaction. UC with nickel additions lowered required sintering temperatures, improved density over control straight UC samples, but did not improve densities over those obtained previously with UC. Microprobe analysis of niobium and 21/4 Cr- 1 Mo compatibility samples tested 4,000 hr at 820 d… more
Date: June 1, 1961
Creator: Strasser, A. & Taylor, K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Out-of-Pile Properties of Mixed Uranium-Plutonium Carbides. Final Report

Description: Fabrication studies to produce high density solid solutions of 80% UC-- 20% PuC, with reproducible structure, composition, and density, were completed. Solid solution (U,Pu)C powder was produced by the oxide-carbon reaction, and the powders were consolidated by cold pressing and sintering. The studies were a continuation of work performed on Contract AT(30-1)-2899 with the USAEC. Two types of material were produced: 1. (U/sub 0.8/Pu/sub 0.2/)C/sub 0.95/, single,phase monocarbide pellets with av… more
Date: December 1, 1963
Creator: Stahl, D.; Strasser, A.; Taylor, K. & Anderson, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Variability of Ocean Heat Uptake: Reconciling Observations and Models

Description: This study examines the temporal variability of ocean heat uptake in observations and in climate models. Previous work suggests that coupled Atmosphere-Ocean General Circulation Models (A-OGCMs) may have underestimated the observed natural variability of ocean heat content, particularly on decadal and longer timescales. To address this issue, we rely on observed estimates of heat content from the 2004 World Ocean Atlas (WOA-2004) compiled by Levitus et al. (2005). Given information about the di… more
Date: May 5, 2005
Creator: AchutaRao, K. M.; Santer, B. D.; Gleckler, P. J.; Taylor, K.; Pierce, D.; Barnett, T. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Supernova/Acceleration Probe: A Satellite Experiment to Study the Nature of the Dark Energy

Description: The Supernova/Acceleration Probe (SNAP) is a proposed space-based experiment designed to study the dark energy and alternative explanations of the acceleration of the Universes expansion by performing a series of complementary systematics-controlled astrophysical measurements. We here describe a self-consistent reference mission design that can accomplish this goal with the two leading measurement approaches being the Type Ia supernova Hubble diagram and a wide-area weak gravitational lensing s… more
Date: May 12, 2004
Creator: Aldering, G.; Althouse, W.; Amanullah, R.; Annis, J.; Astier, P.; Baltay, C. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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CARBIDE FUEL DEVELOPMENT. Progress Report, October 1, 1962-March 31, 1963

Description: FUEL FABRlCATlON AND EVALUATION. The synthesis and fabrication of (UO/ sub 0.95/Pu/sub 0.05/)C/sub 0.98/ test specimens by cold pressing and sintering for out-of-pile property measurements were completed. Theoretical densities of 91% (avg) were obtained without sirtering aid and 96% (avg) with 0.1 wt% nickel sintering aid. Mixed sesquicarbide, ated into pellets 94% of theoretical density. Massive, carbon-stabilized PuO was synthesized by the carbon reduction of the dioxide. The carbon content o… more
Date: May 1, 1963
Creator: Strasser, A.; Stahl, D.; Taylor, K. & Anderson, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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CARBIDE FUEL DEVELOPMENT. Progress Report, September 15, 1961 to December 31, 1961

Description: Single phase, solid solution, UC-PuC powder was synthesized reproducibly from a mixture of the oxides and carbon. A simple method of monitoring the reaction was developed. UC-PuC-0.1 wt% Ni pellets of 93% theoretical density were made reproducibly, with some samples as high as 95% of theoretical denstty. The pellets contain minor amounts of (U,Pu)/sub 2/C/sub 3/ most of the time. Efforts to make reproducible 95%, single-phase material are under way. Microprobe analysis of UC-0.1 wt% Ni specimen… more
Date: February 1, 1962
Creator: Strasser, A. & Taylor, K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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CARBIDE FUEL DEVELOPMENT. Phase IV Report, September 15, 1961-September 30, 1962

Description: Single-phase solid solution UC-- PuC powders were prepared by the carbon reduction of a mixture of UO/sub 2/ and PuO/sub 2/. A simple method was developed to determine the completion of the reaction by analyzing the exhaust gas from the furnace for CO. Four groups of solid solution (U/sub 0.8/Pu/sub 0.2/ )C/sub 0.95/ pellets were prepared for irradiation tests. The groups differed in the enrichment of uranium and in the presence or absence of nickel sintering aid. Without sintering aid, densiti… more
Date: March 31, 1963
Creator: Taylor, K.; Anderson, J. & Strasser, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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CARBIDE FUEL DEVELOPMENT. Progress Report, January 1, 1962 to March 31, 1962

Description: Reproducibly high density UC-PuC pellets containing minor amounts of (U,Pu)/sub 2/C/sub 3/ were made with nickel sintering aid. Average densities of 95% and maximum densities of 96.6% of theoretical were obtained. High density, singlephase UC-PuC pellets were made by sintering at high temperatures. Densities of 94% of theoretical appear to be attainable. Improved identification of microstructural constituents was made by means of metallography, x-ray diffraction, and microprobe analysis. Develo… more
Date: May 28, 1962
Creator: Strasser, A. & Taylor, K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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CARBIDE FUEL DEVELOPMENT. Progress Report, April 1, 1962 to June 30, 1962

Description: All of the UC-PuC powder required for the natural U irradiation specimens, and some of the powder required for the enriched U irradiation specimens was synthesized. All of the natural uranium UC-PuC pellets required were fabrlcated by pressing and sintering, and are being ground to size. The average density of the (U/sub 0.8/Pu/sub 0.2/)C/sub 0.95/ pellets was 12.54 g/cm/ sup 3/ (92.4% of theoretical) and of the (U/sub 0.08/Pu/sub 0.2/)C/sub 0.95/ plus 0.1 wt% Ni pellets was 13.15 g/cm/sup 3 (9… more
Date: August 10, 1962
Creator: Strasser, A. & Taylor, K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Detecting and Attributing External Influences on the Climate System: A Review of Recent Advances

Description: We review recent research that assesses evidence for the detection of anthropogenic and natural external influences on the climate. Externally driven climate change has been detected by a number of investigators in independent data covering many parts of the climate system, including surface temperature on global and large regional scales, ocean-heat content, atmospheric circulation, and variables of the free atmosphere, such as atmospheric temperature and tropopause height. The influence of ex… more
Date: January 26, 2005
Creator: Barnett, T.; Zwiers, F.; Hegerl, G.; Allen, M.; Crowley, T.; Gillett, N. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Changes in the vertical temperature structure associated with carbonaceous aerosols

Description: Carbonaceous aerosols from anthropogenic activities act to both scatter and absorb solar radiation. It has been postulated that absorption by aerosols might significantly alter both the vertical temperature structure of the atmosphere and cloud fraction [Hansen et al. 1997, Ackerman et al, 2000]. Since both effects may alter the assessment of climate change associated with human activities, it is very important to understand both the magnitude and the mechanism by which carbonaceous aerosols af… more
Date: February 8, 2002
Creator: Zhang, Y.; Penner, J. E.; Chuang, C. C.; Santer, B. D. & Taylor, K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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PCMDI analysis of candidate atmospheric models for CCSM

Description: This report is intended to give a summary analysis of the candidate model configurations under consideration by NCAR for the atmospheric component of next version of the Community Climate System Model (CCSM). Intercomparison results are presented for each of the models available prior to the Atmospheric Model Working Group (AMWG) meeting, December 12-14, 2000. We present four types of figures in this report. The traditional methods of viewing zonal mean surface fields, latitude-longitude maps a… more
Date: December 13, 2000
Creator: Wehner, M. F.; Taylor, K.; Doutriaux, C.; AchutaRao, K.; Gleckler, P.; Hnilo, J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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An Appraisal of Coupled Climate Model Simulations

Description: In 2002, the Program for Climate Model Diagnosis and Intercomparison (PCMDI) proposed the concept for a state-of-the-science appraisal of climate models to be performed approximately every two years. Motivation for this idea arose from the perceived needs of the international modeling groups and the broader climate research community to document progress more frequently than provided by the Intergovernmental Panel on Climate Change (IPCC) Assessment Reports. A committee of external reviewers, w… more
Date: February 24, 2004
Creator: Sperber, K.; Gleckler, P.; Covey, C.; Taylor, K.; Bader, D.; Phillips, T. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Basic Research Needs for the Hydrogen Economy. Report of the Basic Energy Sciences Workshop on Hydrogen Production, Storage and Use, May 13-15, 2003

Description: The coupled challenges of a doubling in the world's energy needs by the year 2050 and the increasing demands for ''clean'' energy sources that do not add more carbon dioxide and other pollutants to the environment have resulted in increased attention worldwide to the possibilities of a ''hydrogen economy'' as a long-term solution for a secure energy future.
Date: February 1, 2004
Creator: Dresselhaus, M.; Crabtree, G.; Buchanan, M.; Mallouk, T.; Mets, L.; Taylor, K. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Improving safety through root cause analysis

Description: Operations at the US Department of Energy -- Savannah River Site (SRS) include such diverse facilities as reactors, fuel fabrication, chemical processing, coal burning power houses, analytical laboratories and research facilities. To enhance the safety of operations at SRS, a Root Cause Analysis process has been developed and is discussed in this document. Root Cause Analysis is a three-step process designed to evaluate and correct problems by identifying WHY an occurrence happened. Although th… more
Date: January 1, 1991
Creator: Gatlin, J. L. & Taylor, K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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