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Polycube Oxidation and Factors Affecting the Concentrations of Gaseous Products
The degraded polycube samples were tested in air and argon/oxygen atmospheres to determine the effect of size increase on the flammable gases concentrations. Within the size range tested, the flammable gas generation rate increases with increasing size but the extrapolation of the data to actual processing polycube size yielded flammable gas species concentration in the off-gas stream below the lower flammable limit of all the major gas species identified. Extreme surface area increase with a powder sample showed no significant effect on the flammable gas generation rate. The polycube went through the thermal stabilization process by undergoing both pyrolysis and oxidation generating at the end a plutonium oxide powder that showed unmeasurable weight change at 1273 K.
Date:
April 4, 2000
Creator:
Abrefah, John; MacFarlan, Paul J. & Sell, Rachel L.
Object Type:
Text
System:
The UNT Digital Library
B physics: measurement of partial widths and search for direct cp violation in d0 meson decays
We present a measurement of relative partial widths and decay rate CP asymmetries in K{sup -}K{sup +} and {pi}{sup -}{pi}{sup +} decays of D{sup 0} mesons produced in p{bar p} collisions at {radical}s = 1.96TeV. We use a sample of 2 x 10{sup 5} D*{sup +} {yields} D{sup 0}{pi}{sup +} (and charge conjugate) decays with the D{sup 0} decaying to K{sup -}{pi}{sup +}, K{sup -}K{sup +}, and {pi}{sup -}{pi}{sup +}, corresponding to 123 pb{sup -1} of data collected by the Collider Detector at Fermilab II experiment at the Fermilab Tevatron collider. No significant direct CP violation is observed. We measure {Lambda}(D{sup 0} {yields} K{sup -}K{sup +})/{Lambda}(D{sup 0} {yields} K{sup -}{pi}{sup +}) = 0.0992 {+-} 0.0011 {+-} 0.0012, {Lambda}(D{sup 0} {yields} {pi}{sup -}{pi}{sup +})/{Lambda}(D{sup 0} {yields} K{sup -}{pi}{sup +}) = 0.03594 {+-} 0.00054 {+-} 0.00040, A{sub CP} (K{sup -}K{sup +}) = (2.0 {+-} 1.2 {+-} 0.6)%, and A{sub CP} ({pi}{sup -}{pi}{sup +}) = (1.0 {+-} 1.3 {+-} 0.6) %, where, in all cases, the first uncertainty is statistical and the second is systematic.
Date:
April 4, 2005
Creator:
Acosta, D.
Object Type:
Report
System:
The UNT Digital Library
USING WET AIR OXIDATION TECHNOLOGY TO DESTROY TETRAPHENYLBORATE
A bench-scale feasibility study on the use of a Wet Air Oxidation (WAO) process to destroy a slurry laden with tetraphenylborate (TPB) compounds has been undertaken. WAO is an aqueous phase process in which soluble and/or insoluble waste constituents are oxidized using oxygen or oxygen in air at elevated temperatures and pressures ranging from 150 C and 1 MPa to 320 C and 22 MPa. The products of the reaction are CO{sub 2}, H{sub 2}O, and low molecular weight oxygenated organics (e.g. acetate, oxalate). Test results indicate WAO is a feasible process for destroying TPB, its primary daughter products [triphenylborane (3PB), diphenylborinic acid (2PB), and phenylboronic acid (1PB)], phenol, and most of the biphenyl byproduct. The required conditions are a temperature of 300 C, a reaction time of 3 hours, 1:1 feed slurry dilution with 2M NaOH solution, the addition of CuSO{sub 4}.5H{sub 2}O solution (500 mg/L Cu) as catalyst, and the addition of 2000 mL/L of antifoam. However, for the destruction of TPB, its daughter compounds (3PB, 2PB, and 1PB), and phenol without consideration for biphenyl destruction, less severe conditions (280 C and 1-hour reaction time with similar remaining above conditions) are adequate.
Date:
April 4, 2007
Creator:
Adu-Wusu, K; Daniel McCabe, D & Bill Wilmarth, B
Object Type:
Article
System:
The UNT Digital Library
Computation Directorate and Science& Technology Review Computational Science and Research Featured in 2002
Thank you for your interest in the activities of the Lawrence Livermore National Laboratory Computation Directorate. This collection of articles from the Laboratory's Science & Technology Review highlights the most significant computational projects, achievements, and contributions during 2002. In 2002, LLNL marked the 50th anniversary of its founding. Scientific advancement in support of our national security mission has always been the core of the Laboratory. So that researchers could better under and predict complex physical phenomena, the Laboratory has pushed the limits of the largest, fastest, most powerful computers in the world. In the late 1950's, Edward Teller--one of the LLNL founders--proposed that the Laboratory commission a Livermore Advanced Research Computer (LARC) built to Livermore's specifications. He tells the story of being in Washington, DC, when John Von Neumann asked to talk about the LARC. He thought Teller wanted too much memory in the machine. (The specifications called for 20-30,000 words.) Teller was too smart to argue with him. Later Teller invited Von Neumann to the Laboratory and showed him one of the design codes being prepared for the LARC. He asked Von Neumann for suggestions on fitting the code into 10,000 words of memory, and flattered him about ''Labbies'' …
Date:
April 4, 2003
Creator:
Alchorn, A L
Object Type:
Report
System:
The UNT Digital Library
Oral History Interview with Preston Allen, April 4, 2003
The National Museum of the Pacific War presents an oral interview with Preston Allen. Allen was born in Columbus, Indiana on 6 January 1926. Upon enlisting in the Navy, he went to Great Lakes Naval Training Station for boot training. After graduation, he was assigned to the USS New York (BB-34). He made several trips across the Atlantic aboard the New York before requesting submarine duty. He then went to submarine school in New London, Connecticut. From there he attended diesel school at Groton, Connecticut. Upon graduating as a motor machinist, he was assigned to the USS Perch (SS-313). After conducting sea trials the boat departed to Pearl Harbor via the Panama Canal. On their first patrol they sunk a Japanese tanker and were subjected to depth charge attack by destroyers. The next day they sank a Japanese patrol boat with gun fire. On their second patrol one of their main engines required major repairs. The engine room crew worked seventy-two hours straight to get it repaired. As the boat returned to Midway, a PBY dropped a bomb inflicting no to the boat. Allen suffered a ruptured eardrum from the explosion. After the Perch returned to Pearl Harbor, Allen was …
Date:
April 4, 2003
Creator:
Allen, Preston
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with Preston Allen, April 4, 2003
The National Museum of the Pacific War presents an oral interview with Preston Allen. Allen was born in Columbus, Indiana on 6 January 1926. Upon enlisting in the Navy, he went to Great Lakes Naval Training Station for boot training. After graduation, he was assigned to the USS New York (BB-34). He made several trips across the Atlantic aboard the New York before requesting submarine duty. He then went to submarine school in New London, Connecticut. From there he attended diesel school at Groton, Connecticut. Upon graduating as a motor machinist, he was assigned to the USS Perch (SS-313). After conducting sea trials the boat departed to Pearl Harbor via the Panama Canal. On their first patrol they sunk a Japanese tanker and were subjected to depth charge attack by destroyers. The next day they sank a Japanese patrol boat with gun fire. On their second patrol one of their main engines required major repairs. The engine room crew worked seventy-two hours straight to get it repaired. As the boat returned to Midway, a PBY dropped a bomb inflicting no to the boat. Allen suffered a ruptured eardrum from the explosion. After the Perch returned to Pearl Harbor, Allen was …
Date:
April 4, 2003
Creator:
Allen, Preston
Object Type:
Text
System:
The Portal to Texas History
Altus Times (Altus, Okla.), Vol. 106, No. 3, Ed. 1 Sunday, April 4, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 4, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 107, No. 3, Ed. 1 Monday, April 4, 2005
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 4, 2005
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Assessing the Effects of Radiation Damage on Ni-base Alloys for the Prometheus Space Reactor System
Ni-base alloys were considered for the Prometheus space reactor pressure vessel with operational parameters of {approx}900 K for 15 years and fluences up to 160 x 10{sup 20} n/cm{sup 2} (E > 0.1 MeV). This paper reviews the effects of irradiation on the behavior of Ni-base alloys and shows that radiation-induced swelling and creep are minor considerations compared to significant embrittlement with neutron exposure. While the mechanism responsible for radiation-induced embrittlement is not fully understood, it is likely a combination of helium embrittlement and solute segregation that can be highly dependent on the alloy composition and exposure conditions. Transmutation calculations show that detrimental helium levels would be expected at the end of life for the inner safety rod vessel (thimble) and possibly the outer pressure vessel, primarily from high energy (E > 1 MeV) n,{alpha} reactions with {sup 58}Ni. Helium from {sup 10}B is significant only for the outer vessel due to the proximity of the outer vessel to the BeO control elements. Recommendations for further assessments of the material behavior and methods to minimize the effects of radiation damage through alloy design are provided.
Date:
April 4, 2006
Creator:
Angeliu, T.; Ward, J. & Witter, J.
Object Type:
Report
System:
The UNT Digital Library
Improving Ventilation and Saving Energy: Final Report on Indoor Environmental Quality and Energy Monitoring in Sixteen Relocatable Classrooms
An improved HVAC system for portable classrooms was specified to address key problems in existing units. These included low energy efficiency, poor control of and provision for adequate ventilation, and excessive acoustic noise. Working with industry, a prototype improved heat pump air conditioner was developed to meet the specification. A one-year measurement-intensive field-test of ten of these IHPAC systems was conducted in occupied classrooms in two distinct California climates. These measurements are compared to those made in parallel in side by side portable classrooms equipped with standard 10 SEER heat pump air conditioner equipment. The IHPAC units were found to work as designed, providing predicted annual energy efficiency improvements of about 36 percent to 42 percent across California's climate zones, relative to 10 SEER units. Classroom ventilation was vastly improved as evidenced by far lower indoor minus outdoor CO2 concentrations. TheIHPAC units were found to provide ventilation that meets both California State energy and occupational codes and the ASHRAE minimum ventilation requirements; the classrooms equipped with the 10 SEER equipment universally did not meet these targets. The IHPAC system provided a major improvement in indoor acoustic conditions. HVAC system generated background noise was reduced in fan-only and fan and compressor …
Date:
April 4, 2008
Creator:
Apte, Michael G.; Norman, Bourassa; Faulkner, David; Hodgson, Alfred T.; Hotchi, Toshfumi; Spears, Michael et al.
Object Type:
Report
System:
The UNT Digital Library
Metastable Vacua and D-branes at the Conifold
We consider quiver gauge theories arising on D-branes at simple Calabi-Yau singularities (quotients of the conifold). These theories have metastable supersymmetry breaking vacua. The field theoretic mechanism is basically the one exhibited by the examples of Intriligator, Seiberg and Shih in SUSY QCD. In a dual description, the SUSY breaking is captured by the presence of anti-branes. In comparison to our earlier related work, the main improvements of the present construction are that we can reach the free magnetic range of the SUSY QCD theory where the existence of the metastable vacua is on firm footing, and we can see explicitly how the small masses for the quark flavors (necessary to the existence of the SUSY breaking vacua) are dynamically stabilized. One crucial mass term is generated by a stringy instanton. Finally, our models naturally incorporate R-symmetry breaking in the non-supersymmetric vacuum, in a way similar to the examples of Kitano, Ooguri and Ookouchi.
Date:
April 4, 2007
Creator:
Argurio, Riccardo; Bertolini, Matteo; Franco, Sebastian & Kachru, Shamit
Object Type:
Article
System:
The UNT Digital Library
BIBLIOGRAPHIC DATABASES IN SUPPORT OF NSDD EVALUATIONS.
Bibliographic databases useful to nuclear structure and decay data (NSDD) evaluators are briefly described, along with examples of their usage. Authors' reference listings are also discussed. Nuclear Science References is recognized as the major bibliographic resource, and therefore most of the presentation is devoted to this database.
Date:
April 4, 2005
Creator:
BURROWS, T.
Object Type:
Article
System:
The UNT Digital Library
ENSDF ANALYSIS AND UTILITY CODES.
The ENSDF analysis and checking codes are briefly described, along with their uses with various types of ENSDF datasets. For more information on the programs see ''Read Me'' entries and other documentation associated with each code.
Date:
April 4, 2005
Creator:
BURROWS, T.
Object Type:
Article
System:
The UNT Digital Library
15th Street News (Midwest City, Okla.), Vol. 32, No. 23, Ed. 1 Friday, April 4, 2003
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
April 4, 2003
Creator:
Baldwin, Alisha
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Validation of a Gamma Spectrometric Method for the Measurement of {sup 226,228}Ra in Environmental Media Relevant to the Offshore Oil and Gas Industry
The offshore production of oil and gas leads to naturally occurring {sup 226,228}Ra being brought to the surface along with produced water. Assessment of potential environmental exposures, if any, requires accurate, precise and practical methods for the measurement of low concentrations of {sup 226,228}Ra. A method for the simultaneous measurement of {sup 226,228}Ra in marine sediments, biota and produced water at a sensitivity of 0.01 pCi/g using high-sensitivity, high-resolution gamma spectrometry was subjected to an interlaboratory exercise using U.S. commercial laboratories to validate its accuracy, precision, robustness, and sample throughput. The prescribed method involves direct counting for solid samples and a simple Pb({sup 133}Ba,Ra)SO{sub 4} co-precipitation procedure for water samples followed by gamma counting. Analytical results received from the participating laboratories were subjected to data analysis and statistical evaluation to validate the overall performance of the prescribed method. Relatively good precision and high accuracy of data were achieved when the participating laboratories followed the prescribed procedure closely. The consistency of results among laboratories was not correlated to the {sup 226,228}Ra concentrations in the samples. Most of the results that failed the acceptance criteria were either due to the absence of geometric and secular equilibrium between {sup 226}Ra and its signature …
Date:
April 4, 2003
Creator:
Bandong, B B; Kreek, S A; Bazan, J M; Torretto, P C; Dixon, J A; Edwards, W L et al.
Object Type:
Article
System:
The UNT Digital Library
Genetic and Molecular Dissection of Arsenic Hyperaccumulation in the fern Pteris vittata.
Pteris vittata is a fern that is extraordinary in its ability to tolerate hyperaccumulate high levels of arsenic (As). The goals of the proposed research, to identify the genes that are necessary for As hyperaccumulation in P. vittata using molecular and genetic approaches and to understand the physiology of arsenic uptake and distribution in the living plant, were accomplished during the funding period. The genes that have been identified may ultimately enable the engineering or selection of other plants capable of As hyperaccumulation. This is important for the phytoremediation of arsenic-contaminated soils in areas where P. vittata cannot grow.
Date:
April 4, 2008
Creator:
Banks, Jo Ann & Salt, David
Object Type:
Report
System:
The UNT Digital Library
Oral History Interview with Paul Barbee, April 4, 2004
The National Museum of the Pacific War presents an interview with Paul Barbee. Barbee joined the Navy in February of 1944. He completed submarine school. Beginning January of 1945, Barbee served as Third-Class Electrician aboard USS Steelhead (SS-280). They completed war patrols at Pearl Harbor, Midway Island and Japan, and helped with rescue missions of downed pilots and crews. Barbee continued his service after the war ended, and received his discharge in May of 1946.
Date:
April 4, 2004
Creator:
Barbee, Paul
Object Type:
Sound
System:
The Portal to Texas History
Oral History Interview with Paul Barbee, April 4, 2004
The National Museum of the Pacific War presents an interview with Paul Barbee. Barbee joined the Navy in February of 1944. He completed submarine school. Beginning January of 1945, Barbee served as Third-Class Electrician aboard USS Steelhead (SS-280). They completed war patrols at Pearl Harbor, Midway Island and Japan, and helped with rescue missions of downed pilots and crews. Barbee continued his service after the war ended, and received his discharge in May of 1946.
Date:
April 4, 2004
Creator:
Barbee, Paul
Object Type:
Text
System:
The Portal to Texas History
Spindletop-Gladys City Boomtown Museum, Beaumont
Spindletop-Gladys City Boomtown Museum, Beaumont. Reenactment of the Spindletop Gusher with performers in period costumes. There she blows - a water cannon recreates the Spindletop gusher of January 10, 1901.
Date:
April 4, 2006
Creator:
Belden, Dreanna L.
Object Type:
Photograph
System:
The Portal to Texas History
Spindletop-Gladys City Boomtown Museum, Beaumont
Spindletop-Gladys City Boomtown Museum, Beaumont. Reenactment of the Spindletop Gusher with performers in period costumes. There she blows - a water cannon recreates the Spindletop gusher of January 10, 1901.
Date:
April 4, 2006
Creator:
Belden, Dreanna L.
Object Type:
Photograph
System:
The Portal to Texas History
Spindletop-Gladys City Boomtown Museum, Beaumont
Spindletop-Gladys City Boomtown Museum, Beaumont. Reenactment of the Spindletop Gusher with performers in period costumes. There she blows - a water cannon recreates the Spindletop gusher of January 10, 1901.
Date:
April 4, 2006
Creator:
Belden, Dreanna L.
Object Type:
Photograph
System:
The Portal to Texas History
Spindletop-Gladys City Boomtown Museum, Beaumont
Spindletop-Gladys City Boomtown Museum, Beaumont. Reenactment of the Spindletop Gusher with performers in period costumes. There she blows - a water cannon recreates the Spindletop gusher of January 10, 1901.
Date:
April 4, 2006
Creator:
Belden, Dreanna L.
Object Type:
Photograph
System:
The Portal to Texas History
Spindletop-Gladys City Boomtown Museum, Beaumont
Spindletop-Gladys City Boomtown Museum, Beaumont. Reenactment of the Spindletop Gusher with performers in period costumes. There she blows - a water cannon recreates the Spindletop gusher of January 10, 1901.
Date:
April 4, 2006
Creator:
Belden, Dreanna L.
Object Type:
Photograph
System:
The Portal to Texas History
Spindletop-Gladys City Boomtown Museum, Beaumont
Spindletop-Gladys City Boomtown Museum, Beaumont. Reenactment of the Spindletop Gusher with performers in period costumes.
Date:
April 4, 2006
Creator:
Belden, Dreanna L.
Object Type:
Photograph
System:
The Portal to Texas History