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451 Matching Results
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Materials Evaluation Test Series (METS) 04, 05, and 06
The purpose of this work is to examine the environmental, safety, health and operational aspects of detonating a confined explosive test apparatus that has been designed to maximize the dynamics of impact on beryllium metal components for Contained Firing Facility (CFF) applications. A combination of experimental collection and evaluation methods were designed and implemented to provide an evaluation of immediately postdetonation by-products reflecting a potential worst-case scenario beryllium aerosolization explosive event. The collective Material Evaluation Test Series (METS) 04 - 06 provided explosive devices designed to scale for the dedicated METS firing tank that would provide a post-detonation internal environment comparable to the CFF. The experimental results provided appropriate information to develop operational parameters to be considered for conducting full-scale beryllium-containing experimental tests with similar designs within CFF and B801A. These operational procedures include the inclusion of chelating agents in pre-shot CFF cardboard containers with a minimum of 600 gallons content, an extended time period post-test before purging the CFF chamber, and an adaptation of approaches toward applications of the scrubber and HEPA systems during the post-shot sequence for an integrated environmental, safety, and health approach. In addition, re-entry and film retrieval procedures will be adapted, in line with abatement …
Date:
March 23, 2006
Creator:
Zalk, D.; Ingram, C.; Simmons, L.; Arganbright, R.; Lyle, J. & Wong, K.
Object Type:
Report
System:
The UNT Digital Library
Stark Tuning of Donor Electron Spins of Silicon
We report Stark shift measurements for {sup 121}Sb donor electron spins in silicon using pulsed electron spin resonance. Interdigitated metal gates on top of a Sb-implanted {sup 28}Si epi-layer are used to apply electric fields. Two Stark effects are resolved: a decrease of the hyperfine coupling between electron and nuclear spins of the donor and a decrease in electron Zeeman g-factor. The hyperfine term prevails at X-band magnetic fields of 0.35T, while the g-factor term is expected to dominate at higher magnetic fields. A significant linear Stark effect is also resolved presumably arising from strain.
Date:
March 23, 2006
Creator:
Bradbury, Forrest R.; Tyryshkin, Alexei M.; Sabouret, Guillaume; Bokor, Jeff; Schenkel, Thomas & Lyon, Stephen A.
Object Type:
Article
System:
The UNT Digital Library
Vlt and Acs Observations of RDCS J1252.9-2927: Dynamical Structure and Galaxy Populations in a Massive Cluster at Z=1.237*
We present results from an extensive spectroscopic survey, carried out with FORS on the ESO Very Large Telescope, and from an extensive multi-wavelength imaging data set from the Advanced Camera for Surveys and ground based facilities of the cluster of galaxies RDCS J1252.9-2927. We have spectroscopically confirmed 38 cluster members in the redshift range 1.22 < z < 1.25. The distribution in velocity of these spectroscopic members yields a cluster median redshift of z = 1.237 and a rest-frame velocity dispersion of 747{sub -84}{sup +74} km s{sup -1}. Star-forming members are observed to mainly populate the outskirts of the cluster while passive galaxies dominate the central cluster region. Using the 38 confirmed redshifts, we were able to resolve, for the first time at z > 1, kinematic structure. The velocity distribution, which is not Gaussian at the 95% confidence level, is consistent with two groups that are also responsible for the projected elongation of the cluster in the East-West direction. The groups are composed of 26 and 12 galaxies and have velocity dispersions of 486{sub -85}{sup +47} km s{sup -1} and 426{sub -105}{sup +57} km s{sup -1}, respectively. The elongation is also seen in the intracluster gas (from X-ray observations) …
Date:
March 23, 2007
Creator:
Demarco, R.; Rosati, P.; Lidman, C.; Girardi, M.; Nonino, M.; Rettura, A. et al.
Object Type:
Article
System:
The UNT Digital Library
Influence of argon and oxygen on charge-state-resolved ion energydistributions of filtered aluminum arcs
The charge-state-resolved ion energy distributions (IEDs) in filtered aluminum vacuum arc plasmas were measured and analyzed at different oxygen and argon pressures in the range 0.5 8.0 mTorr. A significant reduction of the ion energy was detected as the pressure was increased, most pronounced in an argon environment and for the higher charge states. The corresponding average charge state decreased from 1.87 to 1.0 with increasing pressure. The IEDs of all metal ions in oxygen were fitted with shifted Maxwellian distributions. The results show that it is possible to obtain a plasma composition with a narrow charge-state distribution as well as a narrow IED. These data may enable tailoring thin-film properties through selecting growth conditions that are characterized by predefined charge state and energy distributions.
Date:
March 23, 2006
Creator:
Rosen, Johanna; Anders, Andre; Mraz, Stanislav; Atiser, Adil & Schneider, Jochen M.
Object Type:
Article
System:
The UNT Digital Library
Hydrologic Resources Management Program and Underground Test Area Project FY2005 Progress Report
This report describes FY 2005 technical studies conducted by the Chemical Biology and Nuclear Science Division (CBND) at Lawrence Livermore National Laboratory (LLNL) in support of the Hydrologic Resources Management Program (HRMP) and the Underground Test Area Project (UGTA). These programs are administered by the U.S. Department of Energy, National Nuclear Security Administration, Nevada Site Office (NNSA/NSO) through the Defense Programs and Environmental Restoration Divisions, respectively. HRMP-sponsored work is directed toward the responsible management of the natural resources at the Nevada Test Site (NTS), enabling its continued use as a staging area for strategic operations in support of national security. UGTA-funded work emphasizes the development of an integrated set of groundwater flow and contaminant transport models to predict the extent of radionuclide migration from underground nuclear testing areas at the NTS. The report is organized on a topical basis and contains five chapters that highlight technical work products produced by CBND. However, it is important to recognize that most of this work involves collaborative partnerships with the other HRMP and UGTA contract organizations. These groups include the Energy and Environment Directorate at LLNL (LLNL-E&E), Los Alamos National Laboratory (LANL), the Desert Research Institute (DRI), the U.S. Geological Survey (USGS), Stoller-Navarro …
Date:
March 23, 2007
Creator:
Eaton, G. F.; Genetti, V.; Hu, Q.; Hudson, G. B.; Kersting, A. B.; Lindvall, R. E. et al.
Object Type:
Report
System:
The UNT Digital Library
Nano-subgrain Strengthening in Ball-milled Iron
The strength and deformation behavior of ball-milled, iron-base materials containing nano-scale subgrains have been evaluated. As reported by several authors, nanosubgrains form during the early stages of ball milling as a result of severe plastic deformation inherent in the ball milling process. The strength for these nano-scale subgrains are compared with the strength of larger-scale subgrains in iron and iron-base alloys produced by traditional mechanical working. The data covers over 2 orders of magnitude in subgrain size (from 30 nm to 6 {micro}m) and shows a continuous pattern of behavior. For all materials studied, the strength varied as {lambda}{sup -1}, where {lambda} is the subgrain size. Strengthening from subgrains was found to breakdown at a much smaller subgrain size than strengthening from grains. In addition, the ball-milled materials showed significant strengthening contributions from nano-scale oxide particles. Shear bands are developed during testing of ball-milled materials containing ultra-fine subgrains. A model for shear band development in nano-scale subgrains during deformation has also been developed. The model predicts a strain state of uniaxial compression in the shear band with a strain of -1.24. Subgrains are shown to offer the opportunity for high strength and good work hardening with the absence of yield …
Date:
March 23, 2006
Creator:
Lesuer, D R; Syn, C K & Sherby, O D
Object Type:
Article
System:
The UNT Digital Library
Formation, Stability, and Mobility of One-Dimensional Lipid Bilayer on High Curvature Substrates
Curved lipid membranes are ubiquitous in living systems and play an important role in many biological processes. To understand how curvature and lipid composition affect membrane formation and fluidity we have assembled and studied mixed 1,2-Dioleoyl-sn-Glycero-3-Phosphocholine (DOPC) and 1,2-Dioleoyl-sn-Glycero-3-Phosphoethanolamine (DOPE) supported lipid bilayers on amorphous silicon nanowires with controlled diameters ranging from 20 nm to 200 nm. Addition of cone-shaped DOPE molecules to cylindrical DOPC molecules promotes vesicle fusion and bilayer formation on smaller diameter nanowires. Our experiments demonstrate that nanowire-supported bilayers are mobile, exhibit fast recovery after photobleaching, and have low concentration of defects. Lipid diffusion coefficients in these high-curvature tubular membranes are comparable to the values reported for flat supported bilayers and increase with decreasing nanowire diameter.
Date:
March 23, 2007
Creator:
Huang, J.; Martinez, J.; Artyukhin, A.; Sirbuly, D.; Wang, Y.; Ju, J. W. et al.
Object Type:
Article
System:
The UNT Digital Library
Effect of solution saturation state and temperature on diopside dissolution
Steady-state dissolution rates of diopside are measured as a function of solution saturation state using a titanium flow-through reactor at pH 7.5 and temperature ranging from 125 to 175 C. Diopside dissolved stoichiometrically under all experimental conditions and rates were not dependent on sample history. At each temperature, rates continuously decreased by two orders of magnitude as equilibrium was approached and did not exhibit a dissolution plateau of constant rates at high degrees of undersaturation. The variation of diopside dissolution rates with solution saturation can be described equally well with a ion exchange model based on transition state theory or pit nucleation model based on crystal growth/dissolution theory from 125 to 175 C. At 175 C, both models over predict dissolution rates by two orders of magnitude indicating that a secondary phase precipitated in the experiments. The ion exchange model assumes the formation of a Si-rich, Mg-deficient precursor complex. Lack of dependence of rates on steady-state aqueous calcium concentration supports the formation of such a complex, which is formed by exchange of protons for magnesium ions at the surface.
Date:
March 23, 2007
Creator:
Dixit, S & Carroll, S A
Object Type:
Article
System:
The UNT Digital Library
Greensheet (Houston, Tex.), Vol. 37, No. 81, Ed. 1 Thursday, March 23, 2006
Free weekly newspaper that includes business and classified advertising.
Date:
March 23, 2006
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 37, No. 80, Ed. 1 Thursday, March 23, 2006
Free weekly newspaper that includes business and classified advertising.
Date:
March 23, 2006
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 38, No. 82, Ed. 1 Friday, March 23, 2007
Free weekly newspaper that includes business and classified advertising.
Date:
March 23, 2007
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Port Aransas South Jetty (Port Aransas, Tex.), Vol. 36, No. 12, Ed. 1 Thursday, March 23, 2006
Weekly newspaper from Port Aransas, Texas on Mustang Island that includes local, state and national news along with extensive advertising.
Date:
March 23, 2006
Creator:
Judson, Mary Henkel
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 36, No. 78, Ed. 1 Wednesday, March 23, 2005
Free weekly newspaper that includes business and classified advertising.
Date:
March 23, 2005
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 38, No. 84, Ed. 1 Friday, March 23, 2007
Free weekly newspaper that includes business and classified advertising.
Date:
March 23, 2007
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Dallas, Tex.), Vol. [28], No. [328], Ed. 1 Wednesday, March 23, 2005
Free weekly newspaper that includes business and classified advertising.
Date:
March 23, 2005
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Bogata News (Bogata, Tex.), Vol. 89, No. 45, Ed. 1 Thursday, March 23, 2000
Weekly newspaper from Bogata, Texas that includes local, state, and national news along with advertising.
Date:
March 23, 2000
Creator:
Nichols, Nanalee & Nichols, Thomas
Object Type:
Newspaper
System:
The Portal to Texas History
Mannford Eagle (Mannford, Okla.), Vol. 23, No. 48, Ed. 1 Wednesday, March 23, 2005
Weekly newspaper from Mannford, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 23, 2005
Creator:
Retherford, Bill R.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Cherokeean Herald (Rusk, Tex.), Vol. 156, No. 5, Ed. 1 Wednesday, March 23, 2005
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
March 23, 2005
Creator:
Whitehead, Marie
Object Type:
Newspaper
System:
The Portal to Texas History
Cherokeean/Herald (Rusk, Tex.), Vol. 151, No. 5, Ed. 1 Thursday, March 23, 2000
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
March 23, 2000
Creator:
Whitehead, Marie
Object Type:
Newspaper
System:
The Portal to Texas History
North Texas Daily (Denton, Tex.), Vol. 90, No. 89, Ed. 1 Thursday, March 23, 2006
Daily student newspaper from the University of North Texas in Denton, Texas that includes local, state and campus news along with advertising.
Date:
March 23, 2006
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The University News (Irving, Tex.), Vol. 34, No. 19, Ed. 1 Wednesday, March 23, 2005
Weekly student newspaper from the University of Dallas in Irving, Texas that includes campus news and commentaries along with advertising.
Date:
March 23, 2005
Creator:
Dickens, Jodi
Object Type:
Newspaper
System:
The Portal to Texas History
Dallas Voice (Dallas, Tex.), Vol. 23, No. 45, Ed. 1 Friday, March 23, 2007
Weekly newspaper from Dallas, Texas that includes local, state, and national news and advertising of interest to the Lesbian, Gay, Bisexual, and Transgender (LGBT) community.
Date:
March 23, 2007
Creator:
Nash, Tammye
Object Type:
Newspaper
System:
The UNT Digital Library
[Antonio Lozano Hinojosa]
Una foto de Antonio Lozano Hinojosa en su casa. Lleva una camisa marrón y mira a la cámara. En la pared a su izquierda cuelgan un cuadro con marco dorado y una luminaria decorada con flores.
Date:
March 23, 2005
Creator:
Castillo, José L.
Object Type:
Photograph
System:
The UNT Digital Library
[Antonio looks at the camera]
Una foto de Antonio Lozano Hinojosa en su casa. Lleva una camisa marrón y mira a la cámara. En la pared a su izquierda cuelgan un cuadro con marco dorado y una luminaria decorada con flores.
Date:
March 23, 2005
Creator:
Castillo, José L.
Object Type:
Photograph
System:
The UNT Digital Library