Lagrangian continuum dynamics in ALEGRA. (open access)

Lagrangian continuum dynamics in ALEGRA.

Alegra is an ALE (Arbitrary Lagrangian-Eulerian) multi-material finite element code that emphasizes large deformations and strong shock physics. The Lagrangian continuum dynamics package in Alegra uses a Galerkin finite element spatial discretization and an explicit central-difference stepping method in time. The goal of this report is to describe in detail the characteristics of this algorithm, including the conservation and stability properties. The details provided should help both researchers and analysts understand the underlying theory and numerical implementation of the Alegra continuum hydrodynamics algorithm.
Date: December 1, 2007
Creator: Wong, Michael K. W. & Love, Edward
System: The UNT Digital Library
Discrimination Report: ESTCP UXO Discrimination Study, ESTCPProject #MM-0437 (open access)

Discrimination Report: ESTCP UXO Discrimination Study, ESTCPProject #MM-0437

The FY06 Defense Appropriation contains funding for the 'Development of Advanced, Sophisticated, Discrimination Technologies for UXO Cleanup' in the Environmental Security Technology Certification Program. In 2003, the Defense Science Board observed: 'The problem is that instruments that can detect the buried UXOs also detect numerous scrap metal objects and other artifacts, which leads to an enormous amount of expensive digging. Typically 100 holes may be dug before a real UXO is unearthed! The Task Force assessment is that much of this wasteful digging can be eliminated by the use of more advanced technology instruments that exploit modern digital processing and advanced multi-mode sensors to achieve an improved level of discrimination of scrap from UXOs.' Significant progress has been made in discrimination technology. To date, testing of these approaches has been primarily limited to test sites with only limited application at live sites. Acceptance of discrimination technologies requires demonstration of system capabilities at real UXO sites under real world conditions. Any attempt to declare detected anomalies to be harmless and requiring no further investigation require demonstration to regulators of not only individual technologies, but of an entire decision making process. This discrimination study was be the first phase in what is …
Date: December 21, 2007
Creator: Gasperikova, Erika; Smith, J. Torquil; Morrison, H. Frank & Becker, Alex
System: The UNT Digital Library
Cell Cycle Related Differentiation of Bone Marrow Cells into Lung Cells (open access)

Cell Cycle Related Differentiation of Bone Marrow Cells into Lung Cells

Green-fluorescent protein (GFP) labeled marrow cells transplanted into lethally irradiated mice can be detected in the lungs of transplanted mice and have been shown to express lung specific proteins while lacking the expression of hematopoietic markers. We have studied marrow cells induced to transit cell cycle by exposure to IL-3, IL-6, IL-11 and steel factor at different times of culture corresponding to different phases of cell cycle. We have found that marrow cells at the G1/S interface have a 3-fold increase in cells which assume a lung phenotype and that this increase is no longer seen in late S/G2. These cells have been characterized as GFP{sup +} CD45{sup -} and GFP{sup +} cytokeratin{sup +}. Thus marrow cells with the capacity to convert into cells with a lung phenotype after transplantation show a reversible increase with cytokine induced cell cycle transit. Previous studies have shown the phenotype of bone marrow stem cells fluctuates reversibly as these cells traverse cell cycle, leading to a continuum model of stem cell regulation. The present studies indicate that marrow stem cell production of nonhematopoietic cells also fluctuates on a continuum.
Date: December 31, 2007
Creator: Dooner, Mark; Aliotta, Jason M.; Pimental, Jeffrey; Dooner, Gerri J.; Abedi, Mehrdad; Colvin, Gerald et al.
System: The UNT Digital Library
Analysis of Rayleigh-Taylor Instability: Statistics on Rising Bubbles and Falling Spikes (open access)

Analysis of Rayleigh-Taylor Instability: Statistics on Rising Bubbles and Falling Spikes

None
Date: December 5, 2007
Creator: Kamath, C; Gezahegne, A & Miller, P
System: The UNT Digital Library
Measurment and Interpretation of Seismic Attenuation for Hydrocarbon Exploration (open access)

Measurment and Interpretation of Seismic Attenuation for Hydrocarbon Exploration

This research project is the combined effort of several leading research groups. Advanced theoretical work is being conducted at the Lawrence Berkeley National Laboratory. Here, the fundamental controls on loss mechanisms are being examined, primarily by use of numerical models of heterogeneous porous media. At the University of California, Berkeley, forward modeling is combined with direct measurement of attenuation. This forward modeling provides an estimate of the influence of 1/Q on the observed seismic signature. Direct measures of losses in Vertical Seismic Profiles (VSPs) indicate mechanisms to separate scattering versus intrinsic losses. At the Colorado School of Mines, low frequency attenuation measurements are combined with geologic models of deep water sands. ChevronTexaco is our corporate cosponsor and research partner. This corporation is providing field data over the Genesis Field, Gulf of Mexico. In addition, ChevronTexaco has rebuilt and improved their low frequency measurement system. Soft samples representative of the Genesis Field can now be measured for velocities and attenuations under reservoir conditions. Throughout this project we have: Assessed the contribution of mechanical compaction on time-lapse monitoring; Developed and tested finite difference code to model dispersion and attenuation; Heterogeneous porous materials were modeled and 1/Q calculated vs. frequency; 'Self-affine' heterogeneous materials …
Date: December 31, 2007
Creator: Batzle, Michael; Duranti, Luca; Rector, James & Pride, Steve
System: The UNT Digital Library
Federal Mandatory Minimum Sentencing Statutes (open access)

Federal Mandatory Minimum Sentencing Statutes

None
Date: December 27, 2007
Creator: Doyle, Charles
System: The UNT Digital Library
Predicting Pattern Tooling and Casting Dimensions for Investment Casting, Phase III (open access)

Predicting Pattern Tooling and Casting Dimensions for Investment Casting, Phase III

None
Date: December 24, 2007
Creator: Sabau, Adrian S. & Cannell, Nick
System: The UNT Digital Library
Production process for advanced space satellite system cables/interconnects. (open access)

Production process for advanced space satellite system cables/interconnects.

This production process was generated for the satellite system program cables/interconnects group, which in essences had no well defined production process. The driver for the development of a formalized process was based on the set backs, problem areas, challenges, and need improvements faced from within the program at Sandia National Laboratories. In addition, the formal production process was developed from the Master's program of Engineering Management for New Mexico Institute of Mining and Technology in Socorro New Mexico and submitted as a thesis to meet the institute's graduating requirements.
Date: December 1, 2007
Creator: Mendoza, Luis A.
System: The UNT Digital Library
Geology Data Package for the Single-Shell Tank Waste Management Areas at the Hanford Site (open access)

Geology Data Package for the Single-Shell Tank Waste Management Areas at the Hanford Site

This data package discusses the geology of the single-shell tank (SST) farms and the geologic history of the area. The purpose of this report is to provide the most recent geologic information available for the SST farms. This report builds upon previous reports on the tank farm geology and Integrated Disposal Facility geology with information available after those reports were published.
Date: December 14, 2007
Creator: Reidel, Stephen P. & Chamness, Mickie A.
System: The UNT Digital Library
Major Oil Plays In Utah And Vicinity (open access)

Major Oil Plays In Utah And Vicinity

Utah oil fields have produced over 1.33 billion barrels (211 million m{sup 3}) of oil and hold 256 million barrels (40.7 million m{sup 3}) of proved reserves. The 13.7 million barrels (2.2 million m3) of production in 2002 was the lowest level in over 40 years and continued the steady decline that began in the mid-1980s. However, in late 2005 oil production increased, due, in part, to the discovery of Covenant field in the central Utah Navajo Sandstone thrust belt ('Hingeline') play, and to increased development drilling in the central Uinta Basin, reversing the decline that began in the mid-1980s. The Utah Geological Survey believes providing play portfolios for the major oil-producing provinces (Paradox Basin, Uinta Basin, and thrust belt) in Utah and adjacent areas in Colorado and Wyoming can continue this new upward production trend. Oil plays are geographic areas with petroleum potential caused by favorable combinations of source rock, migration paths, reservoir rock characteristics, and other factors. The play portfolios include descriptions and maps of the major oil plays by reservoir; production and reservoir data; case-study field evaluations; locations of major oil pipelines; identification and discussion of land-use constraints; descriptions of reservoir outcrop analogs; and summaries of the …
Date: December 31, 2007
Creator: Chidsey, Thomas
System: The UNT Digital Library