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10,713 Matching Results
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Water sorption mechanisms for MIS materials.
The fundamental processes that control the amount of water sorbed by impure plutonium-containing materials after calcination are reviewed. Of particular interest is the amount of and rate of moisture sorption at 1000 PPMv (parts-per-million vapor; -3% RH at 25 'C) and 10,000 PPMv (32% RH at 25 'C). Pure plutonium oxide powders will remain below the 0.5 wt% criterion for packaging in the DOE 3013 Standard at both water vapor concentrations [I]. Deliquescent salts that have been observed in calcined materials by DOES Materials Identification and Surveillance (MIS) program will exceed the 0.5 wt% criterion at 10,000 PPMv and will meet that standard at 1,000 PPMv. Hydrated salts will exceed the 0.5 wt% criterion at all technologically achievable water vapor concentrations if allowed to reach equilibrium. Controlling the moisture availability by controlling the atmospheric content at 1000 PPM' and limiting the access to atmospheric moisture after stabilization through the use of a properly configured stabilization boat will minimize moisture uptake by these materials.
Date:
January 1, 2002
Creator:
Veirs, D. K. (Douglas Kirk); Mason, R. E. (Richard E.) & Erickson, R. M. (Randall M.)
Object Type:
Article
System:
The UNT Digital Library
Weld quality evaluation using a high temperature SQUID array
This paper presents preliminary data for evaluating weld quality using high temperature SQUIDS. The SQUIDS are integrated into an instrument known as the SQUID Array Microscope, or SAMi. The array consists of ll SQUIDs evenly distributed over an 8.25 mm baseline. Welds are detected using SAMi by using an on board coil to induce eddy currents in a conducting sample and measuring the resulting magnetic fields. The concept is that the induced magnetic fields will differ in parts of varying weld quality. The data presented here was collected from three stainless steel parts using SAMi. Each part was either solid, included a good weld, or included a bad weld. The induced magnetic field's magnitude and phase relative to the induction signal were measured. For each sample considered, both the magnitude and phase data were measurably different than the other two samples. These results indicate that it is possible to use SAMi to evaluate weld quality.
Date:
January 1, 2002
Creator:
Clark, D. D. (David D.); Espy, M. A. (Michelle A.); Kraus, Robert H., Jr.; Matlachov, A. N. (Andrei N.) & Lamb, J. S. (Jessica S.)
Object Type:
Article
System:
The UNT Digital Library
What is the microscopic response of a system driven far from equilibrium?
The central theme of this lecture is that there exists a surprisingly simple and general answer to the question posed in the title, provided that we frame the question statistically. I will present this result along with several derivations, and will discuss some of its implications and generalizations.
Date:
January 1, 2002
Creator:
Jarzynski, C. (Christopher)
Object Type:
Article
System:
The UNT Digital Library
White Rock Lake Quadrangle
Topographic map of a portion of Texas from the United States Geological Survey (USGS) project. The map includes towns, historic or notable sites, bodies of water, and other geologic features. Scale 1:24000
Date:
2002
Creator:
Geological Survey (U.S.)
Object Type:
Map
System:
The Portal to Texas History
Wildflowers of Texas
Map showing the wildflower regions of Texas. The front of the map is a collage of photos of various wildflowers and the back contains a map showing the regions and descriptions of the flower species.
Date:
2002
Creator:
unknown
Object Type:
Map
System:
The Portal to Texas History
Worker productivity and ventilation rate in a call center: Analyses of time-series data for a group of workers
In previous studies, increased ventilation rates and reduced indoor carbon dioxide concentrations have been associated with improvements in health at work and increased performance in work-related tasks. Very few studies have assessed whether ventilation rates influence performance of real work. This paper describes part one of a two-part analysis from a productivity study performed in a call center operated by a health maintenance organization. Outside air ventilation rates were manipulated, indoor air temperatures, humidities, and carbon dioxide concentrations were monitored, and worker performance data for advice nurses, with 30-minute resolution, were analyzed via multivariate linear regression to look for an association of performance with building ventilation rate, or with indoor carbon dioxide concentration (which is related to ventilation rate per worker). Results suggest that the effect of ventilation rate on worker performance in this call center was very small (probably less than 1%) or nil, over most of the range of ventilation rate experienced during the study (roughly 12 L s{sup -1} to 48 L s{sup -1} per person). However, there is some evidence suggesting performance improvements of 2% or more when the ventilation rate per person is very high, as indicated by indoor CO{sub 2} concentrations exceeding outdoor concentrations …
Date:
January 1, 2002
Creator:
Fisk, William J.; Price, Phillip; Faulkner, David; Sullivan, Douglas; Dibartolomeo, Dennis; Federspiel, Cliff et al.
Object Type:
Report
System:
The UNT Digital Library
X-0557 modified Steven tests : series I and II /.
Low-velocity mechanical impact leading to unintentional reaction is of concern in accident scenarios involving the handling, transport, and storage of high explosives (HE). These have been investigated using different experimental techniques, from small- to large-scale, including, but not limited to the drop weight impact, Taylor anvil impact, Susan,1 and more recently, the Steven and Modified Steven tests.2-8 Ideally, the data will be used to further advance 3-D finite element analysis predictive capability with improved bulk constitutive HE models for the assessment of HE response to mechanical insult. Our overall objectives for these experiments were to (1) evaluate the HE reaction threshold behavior for two different lots of X-0557, and (2) characterize the degree of reaction violence relative to a detonation. This report summarizes our single impact test results on the two different lots of X-0557 in Modified Steven targets.
Date:
January 1, 2002
Creator:
Straight, James W.; Osborn, Michael A.; Coulter, William L.; Mang, Joseph T.; Anderson, Mark C. & Idar, Deanne J.
Object Type:
Article
System:
The UNT Digital Library
X-O557 MODIFIED STEVEN TESTS: SERIES I AND II
None
Date:
January 1, 2002
Creator:
IDAR, D. J.; STRAIGHT, J. W. & AL, ET
Object Type:
Article
System:
The UNT Digital Library
Yakima River Basin Phase II Fish Screen Evaluations, 2001.
In the summer and fall of 2001 the Pacific Northwest National Laboratory (PNNL) evaluated 23 Phase II fish screen sites in the Yakima River Basin as part of a multi-year study for the Bonneville Power Administration (BPA) on the effectiveness of fish screening devices. Data were collected to determine if velocities in front of the screens and in the bypasses met current National Marine Fisheries Service (NMFS) criteria to promote safe and timely fish passage and whether bypass outfall conditions allowed fish to safely return to the river. Based on our studies in 2001, we concluded that: in general, water velocity conditions at the screen sites met fish passage criteria set forth by the NMFS; most facilities efficiently protected juvenile fish from entrainment, impingement, or migration delay; automated cleaning brushes generally functioned properly; chains and other moving parts were well greased and operative; and removal of sediment build-up and accumulated leafy and woody debris are areas that continue to improve. Continued periodic screen evaluations will increase the effectiveness of screen operation and maintenance practices by confirming the effectiveness (or ineffectiveness) of screen operating procedures at individual sites. Where procedures are being followed and problems still occur, evaluation results can be …
Date:
January 1, 2002
Creator:
Carter, J. A.; McMichael, Geoffrey A. & Chamness, M. A.
Object Type:
Report
System:
The UNT Digital Library