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in subjects: "37 Inorganic, Organic, Physical And Analytical Chemistry"  
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Non-destructive analysis of organic hydrogen getter

Description: The authors have developed both static and dynamic sampling approaches to monitor percent saturation and deuteration of 1,4-bis(phenylethynyl)benzene (DEB). To develop this method, it was necessary to separate and identify all partially saturated cis and trans isomers and developed algorithms to determine percent deuteration from the isotope distribution. The advantage of this approach is that the sample remains hermetically sealed in a protective headspace vial and is not destroyed.
Date: March 26, 1999
Creator: Chambers, D. M.; King, H. A. & LeMay, J. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Tracing and age-dating injected groundwater of the west basin barrier project, Los Angeles, CA

Description: This preliminary report summarizes results from isotopic data recently generated on water collected for the West Basin Municipal Water District (WBMWD). Samples comprised monitoring and production wells up to 3.5 miles form the injection barrier, in addition to barrier product and blend water.
Date: March 26, 1999
Creator: Davisson, M L; Eaton, Gp; Hudson, G B & Koester, C
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Hydrologic resources management program, FY 1998 progress report

Description: This report presents the results from FY 1998 technical studies conducted by Lawrence Livermore National Laboratory (LLNL) as part of the Hydrology and Radionuclide Migration Program (HRMP) and Underground Test Area (UGTA) project. The HRMP is sponsored by Defense Programs (DP) of the U.S. Department of Energy, Nevada Operations Office (DOE/NV), and supports DP operations at the Nevada Test Site (NTS) through studies of radiochemistry and resource management related to the defense programs miss… more
Date: July 26, 1999
Creator: Benedict, F.C.; Criss, R.E.; Davisson, M.L.; Eaton, G.F.; Hudson, G.B.; Kenneally, J.M. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Interim report on task 1.4: impurity effects part 1 of 2 to Lawrence Livermore National Laboratory under contract b345772

Description: From our work with baseline ceramics containing Pu, or Ce substituted for Pu, doped with sets of inactive impurity ions (with supposedly the same valency) and sintered in different atmospheres, the conclusion is that all ions of similar size and valency are indeed crystal-chemically equivalent unless there are volatility problems. However, the real question appears to be what are the appropriate valency states of the multivalent impurity ions under given sintering conditions. For example, when … more
Date: February 26, 1999
Creator: Stewart, M W A; Vance, E R & Day, R A
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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MALDI analysis of estane degradation

Description: SEUMALDI has been successfully used to accurately measure the MW of hydrolysis degradation products from Estane 5703. Reasonable structure assignments have been made to the degradation products and several observations reported. Most of the low MW degradation peaks have been identified as ester hydrolysis fragments. The data suggest that the polyester macrodiol may be shorter than the {approximately}2000 amu reported by the manufacturer. Experiments are ongoing to determine if hydrolysis occurs… more
Date: March 26, 1999
Creator: Haining, Helen Ji; Kober, E. M.; LeMay, James D.; Mays, Jimmy; Nonidez, William; Overturf, George E., III et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Chemical Microsensor and Micro-Instrument Technology at Sandia National Laboratories

Description: Important factors in the application of chemical sensing technology to space applications are low mass, small size, and low power. All of these attributes are enabled by the application of MEMS and micro-fabrication technology to chemical sensing. Several Sandia projects that apply these technologies to the development of new chemical sensing capabilities with the potential for space applications will be described. The Polychromator project is a joint project with Honeywell and MIT to develop a… more
Date: March 26, 1999
Creator: Butler, M. A.; Frye-Mason, G. C.; Hughes, R. C. & Osbourn, G. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Plutonium measurements by accelerator mass spectrometry at LLNL

Description: Mass spectrometric methods provide sensitive, routine, and cost-effective analyses of long-lived radionuclides. Here the authors report on the status of work at Lawrence Livermore National Laboratory (LLNL) to develop a capability for actinide measurements by accelerator mass spectrometry (AMS) to take advantage of the high potential of AMS for rejection of interferences. This work demonstrates that the LLNL AMS spectrometer is well-suited for providing high sensitivity, robust, high throughput… more
Date: October 26, 1999
Creator: McAninch, J E; Hamilton, T F; Broan, T A; Jokela, T A; Knezovich, T J; Ognibene, T J et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Method of Dehalogenation using Diamonds

Description: A method for preparing olefins and halogenated olefins is provided comprising contacting halogenated compounds with diamonds for a sufficient time and at a sufficient temperature to convert the halogenated compounds to olefins and halogenated olefins via elimination reactions.
Date: February 26, 1999
Creator: Farcasiu, Malvina; Kaufman, Phillip B.; Ladner, Edward P. & Anderson, Richard R.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
open access

Solid phase microextraction analysis of B83 SLTS and Core B compatibility test units

Description: Solid phase microextraction has permitted the efficient collection and analysis of a broad range of volatile and semivolatile compounds outgassed from materials. In 1998, we implemented a microextraction protocol at Mason and Hanger, Pantex Plant, for the analysis of weapons and compatibility test units. The chemical information that was obtained from this work is interpreted by determining the source and outgas mechanism for each compound in the weapon signature, which is a task only accomplis… more
Date: March 26, 1999
Creator: Chambers, D M; Ithaca, J; King, H A & Malcolm, S
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Stress Distributions in Flowing Aggregated Colloidal Suspensions

Description: Simulations of the flow of concentrated aggregated colloidal systems, at the particulate level, are used to investigate the distribution of stresses in the shear-thiming regime. It is found that the distribution of shear stress carried by interparticle bonds decays approximately exponentially at large stresses, but with a double-exponential distribution for values of positive stress. The microstructural mechanisms associated with large stresses are manifested in clusters which dominate the posi… more
Date: August 26, 1999
Creator: Silbert, L. E.; Farr, R. S.; Melrose, J. R. & Ball, R. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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