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Hydrogen Production in Radioactive Solutions in the Defense Waste Processing Facility
In the radioactive slurries and solutions to be processed in the Defense Waste Processing Facility (DWPF), hydrogen will be produced continuously by radiolysis. This production results from alpha, beta, and gamma rays from decay of radionuclides in the slurries and solutions interacting with the water. More than 1000 research reports have published data concerning this radiolytic production. The results of these studies have been reviewed in a comprehensive monograph. Information about radiolytic hydrogen production from the different process tanks is necessary to determine air purge rates necessary to prevent flammable mixtures from accumulating in the vapor spaces above these tanks. Radiolytic hydrogen production rates are usually presented in terms of G values or molecules of hydrogen produced per 100ev of radioactive decay energy absorbed by the slurry or solution. With the G value for hydrogen production, G(H2), for a particular slurry and the concentrations of radioactive species in that slurry, the rate of H2 production for that slurry can be calculated. An earlier investigation estimated that the maximum rate that hydrogen could be produced from the sludge slurry stream to the DWPF is with a G value of 0.45 molecules per 100ev of radioactive decay energy sorbed by the slurry.
Date:
May 26, 2004
Creator:
CRAWFORD, CHARLES L.
Object Type:
Report
System:
The UNT Digital Library
Hydrogen Production in Radioactive Solutions in the Defense Waste Processing Facility
In the radioactive slurries and solutions to be processed in the Defense Waste Processing Facility (DWPF), hydrogen will be produced continuously by radiolysis. This production results from alpha, beta, and gamma rays from decay of radionuclides in the slurries and solutions interacting with the water. More than 1000 research reports have published data concerning this radiolytic production. The results of these studies have been reviewed in a comprehensive monograph. Information about radiolytic hydrogen production from the different process tanks is necessary to determine air purge rates necessary to prevent flammable mixtures from accumulating in the vapor spaces above these tanks. Radiolytic hydrogen production rates are usually presented in terms of G values or molecules of hydrogen produced per 100ev of radioactive decay energy absorbed by the slurry or solution. With the G value for hydrogen production, G(H2), for a particular slurry and the concentrations of radioactive species in that slurry, the rate of H2 production for that slurry can be calculated. An earlier investigation estimated that the maximum rate that hydrogen could be produced from the sludge slurry stream to the DWPF is with a G value of 0.45 molecules per 100ev of radioactive decay energy sorbed by the slurry.
Date:
May 26, 2004
Creator:
CRAWFORD, CHARLES L.
Object Type:
Report
System:
The UNT Digital Library
Hydrogen Generation by Radiolysis of Tetraphenylborate Solutions and Slurries
This report is a summary of experimental results on radiolytic hydrogen yields from tetraphenylborate (TPB) slurries related to the In-Tank Precipitation (ITP) process. The yields are presented as ''G values'' in units of molecules per 100 eV of absorbed energy. If the radiolytic dose rate is known, the combination of the G value and dose rate gives the rate of hydrogen production. The results of this study are discussed in detail.
Date:
May 26, 2004
Creator:
CRAWFORD, CHARLESL.
Object Type:
Report
System:
The UNT Digital Library
High concentration suspended sediment measurments using acontinuous fiber optic in-stream transmissometer
Suspended sediment loads mobilized during high flow periods in rivers and streams are largely uncharacterized. In smaller and intermittent streams, a large storm may transport a majority of the annual sediment budget. Therefore monitoring techniques that can measure high suspended sediment concentrations at semi-continuous time intervals are needed. A Fiber optic In-stream Transmissometer (FIT) is presented for continuous measurement of high concentration suspended sediment in storm runoff. FIT performance and precision were demonstrated to be reasonably good for suspended sediment concentrations up to 10g/L. The FIT was compared to two commercially available turbidity devices and provided better precision and accuracy at both high and low concentrations. Both turbidity devices were unable to collect measurements at concentrations greater than 4 g/L. The FIT and turbidity measurements were sensitive to sediment particle size. Particle size dependence of transmittance and turbidity measurement poses the greatest problem for calibration to suspended sediment concentration. While the FIT was demonstrated to provide acceptable measurements of high suspended sediment concentrations, approaches to real-time suspended sediment detection need to address the particle size dependence in concentration measurements.
Date:
May 26, 2004
Creator:
Campbell, Chris G.; Laycak, Danny T.; Hoppes, William; Tran,Nguyen T. & Shi, Frank G.
Object Type:
Article
System:
The UNT Digital Library
Chemical Environment at Waste Package Surfaces in a High-Level Radioactive Waste Repository
We have conducted a series of deliquescence, boiling point, chemical transformation, and evaporation experiments to determine the composition of waters likely to contact waste package surfaces over the thermal history of the repository as it heats up and cools back down to ambient conditions. In the above-boiling period, brines will be characterized by high nitrate to chloride ratios that are stable to higher temperatures than previously predicted. This is clearly shown for the NaCl-KNO{sub 3} salt system in the deliquescence and boiling point experiments in this report. Our results show that additional thermodynamic data are needed in nitrate systems to accurately predict brine stability and composition due to salt deliquescence in dust deposited on waste package surfaces. Current YMP models capture dry-out conditions but not composition for NaCl-KNO{sub 3} brines, and they fail to predict dry-out conditions for NaCl-KNO{sub 3}-NaNO{sub 3} brines. Boiling point and deliquescence experiments are needed in NaCl-KNO{sub 3}-NaNO{sub 3} and NaCl-KNO{sub 3}-NaNO{sub 3}-Ca(NO{sub 3}){sub 2} systems to directly determine dry-out conditions and composition, because these salt mixtures are also predicted to control brine composition in the above-boiling period. Corrosion experiments are needed in high temperature and high NO{sub 3}:Cl brines to determine if nitrate inhibits corrosion …
Date:
May 26, 2005
Creator:
Carroll, S; Alai, M; Craig, L; Gdowski, G; Hailey, P; Nguyen, Q A et al.
Object Type:
Report
System:
The UNT Digital Library
Boerne Star & Recorder (Boerne, Tex.), Vol. 100, No. 42, Ed. 1 Friday, May 26, 2006
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
May 26, 2006
Creator:
Cartwright, Brian
Object Type:
Newspaper
System:
The Portal to Texas History
The Boerne Star (Boerne, Tex.), Vol. 103, No. 42, Ed. 1 Tuesday, May 26, 2009
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
May 26, 2009
Creator:
Cartwright, Brian & Velvin, Candace E.
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 78, No. 182, Ed. 1 Friday, May 26, 2000
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
May 26, 2000
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 79, No. 181, Ed. 1 Saturday, May 26, 2001
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
May 26, 2001
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 80, No. 181, Ed. 1 Sunday, May 26, 2002
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
May 26, 2002
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 81, No. 182, Ed. 1 Monday, May 26, 2003
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
May 26, 2003
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 82, No. 177, Ed. 1 Wednesday, May 26, 2004
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
May 26, 2004
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 84, No. 173, Ed. 1 Thursday, May 26, 2005
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
May 26, 2005
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 85, No. 196, Ed. 1 Friday, May 26, 2006
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
May 26, 2006
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
Political Turmoil in Thailand and U.S. Interests
This report examines the Thai government's performance, the role of the military, deposed Prime Minister Thaksin Shinawatra's impact on the situation, and the royal family's influence. It assesses the prospects for more elections, the degree of control exercised by the army over the civilian government, Thaksin's activities and possible future in Bangkok, and the role of the palace in current Thai politics.
Date:
May 26, 2009
Creator:
Chanlett-Avery, Emma
Object Type:
Report
System:
The UNT Digital Library
Endothelial Cell Migration and Vascular Endothelial Growth Factor Expression Are the Result of Loss of Breast Tissue Polarity
Recruiting a new blood supply is a rate-limiting step in tumor progression. In a three-dimensional model of breast carcinogenesis, disorganized, proliferative transformed breast epithelial cells express significantly higher expression of angiogenic genes compared with their polarized, growth-arrested nonmalignant counterparts. Elevated vascular endothelial growth factor (VEGF) secretion by malignant cells enhanced recruitment of endothelial cells (EC) in heterotypic cocultures. Significantly, phenotypic reversion of malignant cells via reexpression of HoxD10, which is lost in malignant progression, significantly attenuated VEGF expression in a hypoxia-inducible factor 1{alpha}-independent fashion and reduced EC migration. This was due primarily to restoring polarity: forced proliferation of polarized, nonmalignant cells did not induce VEGF expression and EC recruitment, whereas disrupting the architecture of growth-arrested, reverted cells did. These data show that disrupting cytostructure activates the angiogenic switch even in the absence of proliferation and/or hypoxia and restoring organization of malignant clusters reduces VEGF expression and EC activation to levels found in quiescent nonmalignant epithelium. These data confirm the importance of tissue architecture and polarity in malignant progression.
Date:
May 26, 2009
Creator:
Chen, Amy; Cuevas, Ileana; Kenny, Paraic A; Miyake, Hiroshi; Mace, Kimberley; Ghajar, Cyrus et al.
Object Type:
Article
System:
The UNT Digital Library
Dairy Policy Issues
Several dairy issues that were debated during the 108th Congress are expected to continue as issues of interest in the 109th Congress. Separate bills were introduced in the 108th Congress to extend authority for both the Milk Income Loss Contract (MILC) Program and the dairy forward pricing pilot program, and to address dairy producer concerns about the importation of milk protein concentrates.
Date:
May 26, 2005
Creator:
Chite, Ralph M.
Object Type:
Report
System:
The UNT Digital Library
Strain-dependent photoluminescence behavior in three geometries of CdSe/CdS nanocrystals
In recent years, a new generation of quantum confined colloidal semiconductor structures has emerged, with more complex shapes than simple quantum dots1, 2. These include nanorods3 and tetrapods4. Beyond shape, it is also now possible to spatially vary the electron and hole potentials within these nanoparticles by varying the composition. Examples of these new structures include seeded dots, rods, and tetrapods, which contain a CdSe core embedded within a CdS shell5, 6. These structures may have many uses beyond those envisioned for simple quantum dots, which are frequently employed in luminescent applications7. This paper is concerned with changes in the optoelectronic properties of tetrapods when the arms are bent. We demonstrate that seeded tetrapods can serve as an optical strain gauge, capable of measuring forces on the order of nanonewtons. We anticipate that a nanocrystal strain gauge with optical readout will be useful for applications ranging from sensitive optomechanical devices to biological force investigations.
Date:
May 26, 2009
Creator:
Choi, Charina L; Koski, Kristie J; Sivasankar, Sanjeevi & Alivisatos, A. Paul
Object Type:
Article
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 86, No. 180, Ed. 1 Saturday, May 26, 2007
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
May 26, 2007
Creator:
Clements, Clifford E.
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 88, No. 146, Ed. 1 Monday, May 26, 2008
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
May 26, 2008
Creator:
Clements, Clifford E.
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 89, No. 143, Ed. 1 Tuesday, May 26, 2009
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
May 26, 2009
Creator:
Clements, Clifford E.
Object Type:
Newspaper
System:
The Portal to Texas History
Potential Future Igneous Activity at Yucca Mountain, Nevada
Location, timing, and volumes of post-Miocene volcanic activity, along with expert judgment, provide the basis for assessing the probability of future volcanism intersecting a proposed repository for nuclear waste at Yucca Mountain, Nevada. Analog studies of eruptive centers in the region that may represent the style and extent of possible future igneous activity at Yucca Mountain have aided in defining the consequence scenarios for intrusion into and eruption through a proposed repository. Modeling of magmatic processes related to magma/proposed repository interactions has been used to assess the potential consequences of a future igneous event through a proposed repository at Yucca Mountain. Results of work to date indicate future igneous activity in the Yucca Mountain region has a very low probability of intersecting the proposed repository. Probability of a future event intersecting a proposed repository at Yucca Mountain is approximately 1.7 x 10{sup -8} per year. Since completion of the Probabilistic Volcanic Hazard Assessment (PVHA) in 1996, anomalies representing potential buried volcanic centers have been identified from aeromagnetic surveys. A re-assessment of the hazard is currently underway to evaluate the probability of intersection in light of new information and to estimate the probability of one or more volcanic conduits located in …
Date:
May 26, 2005
Creator:
Cline, M.; Perry, F.; Valentine, G. & Smistad, E.
Object Type:
Report
System:
The UNT Digital Library
Elections in States Affected by Hurricanes Katrina and Rita
None
Date:
May 26, 2006
Creator:
Coleman, Kevin J. & Fischer, Eric A.
Object Type:
Report
System:
The UNT Digital Library
The Message, Volume 36, May 26, 2000
Newsletter of Congregation Beth Yeshurun in Houston, including news and events, upcoming services, member announcements, editorials, and other information of interest to congregants.
Date:
May 26, 2000
Creator:
Congregation Beth Yeshurun (Houston, Tex.)
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History