Resource Type

2-D and 3-D Elastic Modeling with Shared Seismic Models (open access)

2-D and 3-D Elastic Modeling with Shared Seismic Models

Several elastic models, both 2-D and 3-D, are being built for use in calculating synthetic elastic seismic data. The models will be made available to the research community, along with the synthetic data that are being calculated from them. These shared models have been proposed or contributed by participants in a collaborative industry, national laboratory, and university research project. The purpose of the modeling is to provide synthetic data to better understand elastic wave propagation and the effects of structural and stratigraphic complexities. The 2-D models are easier to design and change and synthetic calculations can be run relatively quickly in them. It will be possible to alter their layer properties and calculate time-lapse data sets from them. Field data will be available to accompany many of the 2-D models. 3-D models are more realistic, but more difficult to design and change. They also require considerably more computing resources to calculate synthetic data from them. A new 3-D model is being designed, and will be used for computing synthetic elastic data.
Date: April 30, 2002
Creator: House, L.; Marfurt, K. J.; Larsen, S. & Martin, G. S.
System: The UNT Digital Library
A 2-Liter, 2000 MPa Air Source for the Radiatively Driven Hypersonic Wind Tunnel (open access)

A 2-Liter, 2000 MPa Air Source for the Radiatively Driven Hypersonic Wind Tunnel

The A2 LITE is a 2 liter, 2000 MPa, 750 K ultra-high pressure (UHP) vessel used to demonstrate UHP technology and to provide an air flow for wind tunnel nozzle development. It is the largest volume UHP vessel in the world. The design is based on a 100:1 pressure intensification using a hydraulic ram as a low pressure driver and a three-layer compound cylinder UHP section. Active control of the 900 mm piston stroke in the 63.5 mm bore permits pressure-time profiles ranging from static to constant pressure during flow through a 1 mm throat diameter nozzle for 1 second.
Date: May 30, 2002
Creator: Costantino, M & Lofftus, D
System: The UNT Digital Library
3-D elastic wave scattering by a layer containing vertical periodic fractures (open access)

3-D elastic wave scattering by a layer containing vertical periodic fractures

None
Date: April 30, 2002
Creator: Nakagawa, Seiji; Nihei, Kurt T.; Myer, Larry R. & Majer, Ernest L.
System: The UNT Digital Library
A 10 Hz Grazing Incidence pumped Ni-like Mo laser at 18.9 nm with 150 mJ pump energy (open access)

A 10 Hz Grazing Incidence pumped Ni-like Mo laser at 18.9 nm with 150 mJ pump energy

The first demonstration of the grazing incidence pumping (GRIP) scheme for laser-driven x-ray lasers (XRLs) is described utilizing 2-pulse pumping. A long pulse is incident normal to the target to produce a plasma with a particular density profile. Then a short pulse is incident at a grazing angle, chosen to optimally couple the short pulse laser energy into the specific density region where the inversion process will occur. The short pulse is simultaneously absorbed and refracted at a maximum electron density specified by the chosen pump angle then turns back into the gain region. The increased path length gives improved absorption allowing a reduction in the drive energy required for lasing. A Ni-like Mo XRL at 18.9 nm has been demonstrated with only 150 mJ total pump energy and a repetition rate of 10 Hz. We report high gains of 60 cm{sup -1} and the achievement of gain saturation for targets of 4 mm length.
Date: September 30, 2004
Creator: Keenan, R.; Dunn, J.; Patel, P. K.; Price, D. F.; Smith, R. F. & Shlyaptsev, V. N.
System: The UNT Digital Library
A 10 kHz Short-Stroke Rotary Fast Tool Servo (open access)

A 10 kHz Short-Stroke Rotary Fast Tool Servo

None
Date: August 30, 2004
Creator: Montesanti, R C & Trumper, D L
System: The UNT Digital Library
A 14 MeV Fusion Neutron Source for Material and Blanket Development and Fission Fuel Production (open access)

A 14 MeV Fusion Neutron Source for Material and Blanket Development and Fission Fuel Production

None
Date: July 30, 2012
Creator: Simonen, T. C.; Moir, R. W.; Molvik, A. W. & Ryutov, D. D.
System: The UNT Digital Library
85-GAL DRUM AND NUCFIL-007LS FILTERS (open access)

85-GAL DRUM AND NUCFIL-007LS FILTERS

{sm_bullet} 55-gallon drums were overpacked into 85-gallon drums {sm_bullet} ANucFiI-007LS long-stem filter was installed- NucFiI certified the use of NucFiI-007LS filters in 8S-gallon drums as DOT 7AType A - Wood wedges were used during the tests to center and . stabilize the inner 55-gallon drums {sm_bullet} During inspection, afew filters were found to be loose, canted, and/or with RTV seals broken - No contamination or loss of container integrity {sm_bullet} Discovered in November 2008 U.
Date: June 30, 2009
Creator: Woodbury, J. B.
System: The UNT Digital Library
1998 Department of Energy Records Management Conference, July 20-23, 1998. Proceedings. Records management: A monumental task (open access)

1998 Department of Energy Records Management Conference, July 20-23, 1998. Proceedings. Records management: A monumental task

This volume includes the proceedings of the 1998 DOE Records Management Conference.
Date: August 30, 1998
Creator: Flynn, Kelly
System: The UNT Digital Library
2005 Plant Metabolic Engineering Gordon Conference - July 10-15, 2005 (open access)

2005 Plant Metabolic Engineering Gordon Conference - July 10-15, 2005

The post-genomic era presents new opportunities for manipulating plant chemistry for improvement of plant traits such as disease and stress resistance and nutritional qualities. This conference will provide a setting for developing multidisciplinary collaborations needed to unravel the dynamic complexity of plant metabolic networks and advance basic and applied research in plant metabolic engineering. The conference will integrate recent advances in genomics, with metabolite and gene expression analyses. Research discussions will explore how biosynthetic pathways interact with regard to substrate competition and channeling, plasticity of biosynthetic enzymes, and investigate the localization, structure, and assembly of biosynthetic metabolons in native and nonnative environments. The meeting will develop new perspectives for plant transgenic research with regard to how transgene expression may influence cellular metabolism. Incorporation of spectroscopic approaches for metabolic profiling and flux analysis combined with mathematical modeling will contribute to the development of rational metabolic engineering strategies and lead to the development of new tools to assess temporal and subcellular changes in metabolite pools. The conference will also highlight new technologies for pathway engineering, including use of heterologous systems, directed enzyme evolution, engineering of transcription factors and application of molecular/genetic techniques for controlling biosynthetic pathways.
Date: June 30, 2006
Creator: Wurtzel, Eleanore T.
System: The UNT Digital Library
2010 Membranes: Materials & Processes Gordon Research Conference (open access)

2010 Membranes: Materials & Processes Gordon Research Conference

The GRC series on Membranes: Materials and Processes have gained significant international recognition, attracting leading experts on membranes and other related areas from around the world. It is now known for being an interdisciplinary and synergistic meeting. The next summer's edition will keep with the past tradition and include new, exciting aspects of material science, chemistry, chemical engineering, computer simulation with participants from academia, industry and national laboratories. This edition will focus on cutting edge topics of membranes for addressing several grand challenges facing our society, in particular, energy, water, health and more generally sustainability. During the technical program, we want to discuss new membrane structure and characterization techniques, the role of advanced membranes and membrane-based processes in sustainability/environment (including carbon dioxide capture), membranes in water processes, and membranes for biological and life support applications. As usual, the informal nature of the meeting, excellent quality of the oral presentations and posters, and ample opportunity to meet many outstanding colleagues make this an excellent conference for established scientists as well as for students. A Gordon Research Seminar (GRS) on the weekend prior to the GRC meeting will provide young researchers an opportunity to present their work and network with outstanding experts. …
Date: July 30, 2010
Creator: Lin, Jerry
System: The UNT Digital Library
2010 Tetrapyrroles, Chemistry & Biology of Gordon Research Conference (open access)

2010 Tetrapyrroles, Chemistry & Biology of Gordon Research Conference

The objective of the Chemistry & Biology of Tetrapyrroles Gordon Conference is to bring together researchers from diverse disciplines that otherwise would not interact. By bringing biologists, chemists, engineers and clinicians with a common interest in tetrapyrroles the conference provides a forum for cross-disciplinary ideas and collaboration. The perspective provided by biologists, chemists, and clinicians working in fields such as newly discovered defects in human porphyrin metabolism, the myriad of strategies for light harvesting in photosynthetic organisms, novel tetrapyrroles that serve as auxiliary chromophores or enzyme cofactors, synthetic strategies in the design of novel tetrapyrrole scaffolds, and tetrapyrrole based cell signaling and regulatory systems, makes this conference unique in the field. Over the years the growing evidence for the role of tetrapyrroles and their reactive intermediates in cell signaling and regulation has been of increasing importance at this conference. The 2010 conference on Chemistry & Biology of Tetrapyrroles will focus on many of these new frontiers as outlined in the preliminary program listed. Speakers will emphasize unpublished results and new findings in the field. The oral sessions will be followed by the highly interactive afternoon poster sessions. The poster sessions provide all conferees with the opportunity to present their latest …
Date: July 30, 2010
Creator: Wilks, Angela
System: The UNT Digital Library
2010 Thin Film & Small Scale Mechanical Behavior Gordon Research Conference (open access)

2010 Thin Film & Small Scale Mechanical Behavior Gordon Research Conference

Over the past decades, it has been well established that the mechanical behavior of materials changes when they are confined geometrically at least in one dimension to small scale. It is the aim of the 2010 Gordon Conference on 'Thin Film and Small Scale Mechanical Behavior' to discuss cutting-edge research on elastic, plastic and time-dependent deformation as well as degradation mechanisms like fracture, fatigue and wear at small scales. As in the past, the conference will benefit from contributions from fundamental studies of physical mechanisms linked to material science and engineering reaching towards application in modern applications ranging from optical and microelectronic devices and nano- or micro-electrical mechanical systems to devices for energy production and storage. The conference will feature entirely new testing methodologies and in situ measurements as well as recent progress in atomistic and micromechanical modeling. Particularly, emerging topics in the area of energy conversion and storage, such as material for batteries will be highlighted. The study of small-scale mechanical phenomena in systems related to energy production, conversion or storage offer an enticing opportunity to materials scientists, who can provide new insight and investigate these phenomena with methods that have not previously been exploited.
Date: July 30, 2010
Creator: Balk, Dr. Thomas
System: The UNT Digital Library
328Post shot analysis of plasma conditions of Au Spheres illuminated by the URLLE Omega laser, as measured via Thomson scattering (open access)

328Post shot analysis of plasma conditions of Au Spheres illuminated by the URLLE Omega laser, as measured via Thomson scattering

None
Date: October 30, 2013
Creator: Rosen, M D; Ross, J S; Scott, H A; Landen, N; Dewald, E; Froula, D et al.
System: The UNT Digital Library
3D HYDRA simulations of NIF targets (open access)

3D HYDRA simulations of NIF targets

The performance of NIF target designs is simulated in three dimensions using the HYDRA multiphysics radiation hydrodynamics code. In simulations of a cylindrical NIF hohlraum that include an imploding capsule, all relevant hohlraum features and the detailed laser illumination pattern, the motion of the wall material inside the hohlraum shows a high degree of axisymmetry. Laser light is able to propagate through the entrance hole for the required duration of the pulse. Gross hohlraum energetics mirror the results from an axisymmetric simulation. A NIF capsule simulation resolved the full spectrum of the most dangerous modes that grow from surface roughness. Hydrodynamic instabilities evolve into the weakly nonlinear regime. There is no evidence of anomalous low mode growth driven by nonlinear mode coupling.
Date: October 30, 2000
Creator: Marinak, M. M.; Kerbel, G. D.; Gentile, N. A.; Jones, O.; Munro, D.; Pollaine, S. et al.
System: The UNT Digital Library
3D Particle Simulation of Beams Using the Warp Code: Transport Around Bends (open access)

3D Particle Simulation of Beams Using the Warp Code: Transport Around Bends

WARP is a discrete-particle simulation program which was developed for studies of space charge dominated ion beams. It combines features of an accelerator code and a particle-in-cell plasma simulation. The code architecture, and techniques employed to enhance efficiency, are briefly described. Current applications are reviewed. In this paper we emphasize the physics of transport of three-dimensional beams around bends. We present a simple bent-beam PIC algorithm. Using this model, we have followed a long, thin beam around a bend in a simple racetrack system (assuming straight-pipe self-fields). Results on beam dynamics are presented; no transverse emittance growth (at mid-pulse) is observed. 11 refs., 5 figs.
Date: November 30, 1990
Creator: Friedman, A.; Grote, D. P.; Callahan, D. A.; Langdon, A. B. & Haber, I.
System: The UNT Digital Library
3D simulations of axially confined heavy ion beams in round and square pipes (open access)

3D simulations of axially confined heavy ion beams in round and square pipes

We have been using the 3d PIC code WARP6 to model the behavior of beams in a heavy ion induction accelerator; such linacs are candidates for an ICF driver. Improvements have been added to the code to model an axially confined beam using comoving axial electric fields to simulate the confining ears'' applied to the accelerating pulses in a real system. We have also added a facility for modeling a beam in a round pipe, applying a capacity matrix to each axial Fourier mode in turn. These additions are described along with results, such as the effect of pipe shape on the beam quality degradation from quadrupole misalignments. 4 refs., 6 figs., 1 tab.
Date: November 30, 1990
Creator: Grote, D. P.; Friedman, A. (Lawrence Livermore National Lab., CA (USA)) & Haber, I. (Naval Research Lab., Washington, DC (USA))
System: The UNT Digital Library
5cm aperture dipole studies (open access)

5cm aperture dipole studies

The results obtained during the evolution of the design, construction, and testing program of the design ''B'' dipole are presented here. Design ''B'' is one of the original three competing designs for the Superconducting Super Collider ''SSC'' arc dipoles. The final design parameters were as follows: air cored (less than a few percent of the magnetic field derived from any iron present), aluminum collared, two layered winding, 5.5T maximum operating field, and a 5 cm cold aperture. There have been fourteen 64 cm long 5 cm aperture model dipoles cold tested (at 4.3K and less) in this program so far. There was a half length full size (6m) mechanical analog (M-10) built and tested to check the cryostat's mechanical design under ramping and quench conditions. Several deviations from the ''Tevatron'' dipole fabrication technique were incorporated, for example the use of aluminum collars instead of stainless steel. The winding technique variations explored were ''dry welding,'' a technique with the cable covered with Kapton insulation only and ''wet winding'' where the Kapton was covered with a light coat of ''B'' stage epoxy. Test data include quench currents, field quality (Fourier multipole co-efficients), coil magnetization, conductor current performance, and coil loading. Quench current, …
Date: September 30, 1986
Creator: McInturff, A.D.; Bossert, R.; Carson, J.; Fisk, H.E.; Hanft, R.; Kuchnir, M. et al.
System: The UNT Digital Library
A 5kV, 3MHz Solid-State Modulator Based on the DSRD Switch for an Ultra-fast Beam Kicker (open access)

A 5kV, 3MHz Solid-State Modulator Based on the DSRD Switch for an Ultra-fast Beam Kicker

None
Date: October 30, 2013
Creator: Benwell, A.; Burkhart, C.; Krasnykh, A.; Tang, T. & Kardo-Sysoev, A.
System: The UNT Digital Library
7Li and 31P Magic Angle Spinning Nuclear Magnetic Resonance of LiFePO4-type materials (open access)

7Li and 31P Magic Angle Spinning Nuclear Magnetic Resonance of LiFePO4-type materials

None
Date: November 30, 2001
Creator: Tucker, Michael C.; Doeff, Marca M.; Richardson, Thomas J.; Finones, Rita; Reimer, Jeffrey A. & Cairns, Elton J.
System: The UNT Digital Library
Ab-initio modeling of water-semiconductor interfaces for direct solar-to-chemical energy conversion (open access)

Ab-initio modeling of water-semiconductor interfaces for direct solar-to-chemical energy conversion

None
Date: June 30, 2010
Creator: Wood, B; Ogitsu, T & Schwegler, E
System: The UNT Digital Library
Ab Initio No-Core Shell Model Calculations Using Realistic Two- and Three-Body Interactions (open access)

Ab Initio No-Core Shell Model Calculations Using Realistic Two- and Three-Body Interactions

There has been significant progress in the ab initio approaches to the structure of light nuclei. One such method is the ab initio no-core shell model (NCSM). Starting from realistic two- and three-nucleon interactions this method can predict low-lying levels in p-shell nuclei. In this contribution, we present a brief overview of the NCSM with examples of recent applications. We highlight our study of the parity inversion in {sup 11}Be, for which calculations were performed in basis spaces up to 9{Dirac_h}{Omega} (dimensions reaching 7 x 10{sup 8}). We also present our latest results for the p-shell nuclei using the Tucson-Melbourne TM three-nucleon interaction with several proposed parameter sets.
Date: November 30, 2004
Creator: Navratil, P; Ormand, W E; Forssen, C & Caurier, E
System: The UNT Digital Library
Ab initio study of optical absorption spectra of semiconductors and conjugated polymers (open access)

Ab initio study of optical absorption spectra of semiconductors and conjugated polymers

The effects of electron-hole interaction on the optical properties of a variety of materials have been calculated using an ab initio method based on solving the Bethe-Salpeter equation. Results on selected semiconductors, insulators, and semiconducting polymers are presented. In the cases of alpha-quartz (SiO2) and poly-phenylene-vinylene, resonant excitonic states qualitatively alter the absorption spectra.
Date: April 30, 2000
Creator: Tiago, M.L.; Chang, Eric K.; Rohlfing, Michael & Louie, Steven G.
System: The UNT Digital Library
The Ability of the United States Federal Radiological Monitoring and Assessment Center to Collect and Disseminate Environmental Measurements during Radiological Emergencies (open access)

The Ability of the United States Federal Radiological Monitoring and Assessment Center to Collect and Disseminate Environmental Measurements during Radiological Emergencies

The Federal Radiological Monitoring and Assessment Center (FRMAC) is the United States’ response organization for radiological emergencies. The FRMAC is structured as an operations center and employs the combined resources of several federal agencies to respond to any disaster resulting in the release of radioactivity. The mission of the FRMAC is to support state and local authorities in the gathering of environmental data using an array of survey equipment ranging from alpha probes, beta/gamma probes, and high-purity germanium (HPGe) spectroscopy to the gathering of physical samples. Once collected, the data are projected on maps to assist public officials make protective action decisions. In addition to the accumulation of data, it is the legal obligation of the FRMAC to keep archival records of all data points and their actions. During an event, it is conceivable that hundreds to thousands of sample points will be recorded over a relatively short time. It is in the interest of the federal government and public that the information collected be put to the best use as fast as possible. Toward this end, the Remote Sensing Laboratory, working under the direction of the United States Department of Energy’s National Nuclear Security Administration, is investigating the use …
Date: April 30, 2007
Creator: Essex, Craig Marianno and James
System: The UNT Digital Library
Absolute calibration of neutron detectors in the 10-30 MeV range (open access)

Absolute calibration of neutron detectors in the 10-30 MeV range

None
Date: April 30, 1975
Creator: Cookson, J. A.; Hussian, M.; Uttley, C. A.; Fowler, J. L. & Schwartz, R. B.
System: The UNT Digital Library