The Development and Application of SCDAP-3D (open access)

The Development and Application of SCDAP-3D

The SCDAP-3D computer code (Coryell 2001) has been developed at the Idaho National Engineering and Environmental Laboratory (INEEL) for the analysis of severe reactor accidents. A prominent feature of SCDAP-3D relative to other versions of the code is its linkage to the state-of-the-art thermal/hydraulic analysis capabilities of RELAP5-3D. Enhancements to the severe accident models include the ability to simulate high burnup and alternative fuel, as well as modifications to support advanced reactor analyses, such as those described by the Department of Energy's Generation IV (GenIV) initiative. Initial development of SCDAP-3D is complete and two widely varying but successful applications of the code are summarized. The first application is to large break loss of coolant accident analysis performed for a reactor with alternative fuel, and the second is a calculation of International Standard Problem 45 (ISP-45) or the QUENCH 6 experiment.
Date: March 5, 2002
Creator: Coryell, E. W.; Harvego, E. A. & Siefken, L. J.
Object Type: Article
System: The UNT Digital Library
Radiative Penguin Decays at the B Factories (open access)

Radiative Penguin Decays at the B Factories

Recent results from the B-Factories on radiative decays such as b {yields} s(d){gamma}, b {yields} s{ell}{ell} and leptonic decay B{sup 0} {yields} {tau}{sup +}{tau}{sup -} are reviewed.
Date: March 5, 2007
Creator: Cuhadar-Donszelmann, T. & U., /British Columbia
Object Type: Article
System: The UNT Digital Library
Improved Modeling of Transition Metals, Applications to Catalysis and Technetium Chemistry (open access)

Improved Modeling of Transition Metals, Applications to Catalysis and Technetium Chemistry

There is considerable impetus for identification of aqueous OM catalysts as water is the ultimate ''green'' solvent. In collaboration with researchers at Ames Lab, we investigated effective fragment and Monte Carlo techniques for aqueous-phase hydroformylation (HyF). The Rh of the HyF catalyst is weakly aquated, in contrast to the hydride of the Rh-H bond. As the insertion of the olefin C=C into Rh-H determines the linear-to-branched aldehyde ratio, it is reasonable to infer that solvent plays an important role in regiochemistry. Studies on aqueous-phase organometallic catalysis were complemented in studies of the gas-phase reaction. A Rh-carbonyl-phosphine catalyst was investigated. Two of the most important implications of this research include (a) pseudorotation among five-coordinate intermediates is significant in HyF, and (b) CO insertion is the rate-determining step. The latter is in contrast to experimental deductions, highlighting the need for more accurate modeling. To this end, we undertook studies of (a) experimentally relevant PR{sub 3} co-ligands (PMe{sub 3}, PPh{sub 3}, P(p-PhSO{sub 3{sup -}}){sub 3}, etc.), and (b) HyF of propene. For the propylene research, simulations indicated that the linear: branched aldehyde ratio (linear is more desirable) is determined by thermodynamic discrimination of two distinct pathways. Other projects include a theory-experiment study of …
Date: March 5, 2004
Creator: Cundari, T. R.
Object Type: Report
System: The UNT Digital Library
Sudan: Humanitarian Crisis, Peace Talks, Terrorism, and U.S. Policy (open access)

Sudan: Humanitarian Crisis, Peace Talks, Terrorism, and U.S. Policy

None
Date: March 5, 2003
Creator: Dagne, Theodore S.
Object Type: Report
System: The UNT Digital Library
Assessing the Effect of Timing of Availability for Carbon Dioxide Storage in the Largest Oil and Gas Pools in the Alberta Basin: Description of Data and Methodology (open access)

Assessing the Effect of Timing of Availability for Carbon Dioxide Storage in the Largest Oil and Gas Pools in the Alberta Basin: Description of Data and Methodology

Carbon dioxide capture from large stationary sources and storage in geological media is a technologically-feasible mitigation measure for the reduction of anthropogenic emissions of CO2 to the atmosphere in response to climate change. Carbon dioxide (CO2) can be sequestered underground in oil and gas reservoirs, in deep saline aquifers, in uneconomic coal beds and in salt caverns. The Alberta Basin provides a very large capacity for CO2 storage in oil and gas reservoirs, along with significant capacity in deep saline formations and possible unmineable coal beds. Regional assessments of potential geological CO2 storage capacity have largely focused so far on estimating the total capacity that might be available within each type of reservoir. While deep saline formations are effectively able to accept CO2 immediately, the storage potential of other classes of candidate storage reservoirs, primarily oil and gas fields, is not fully available at present time. Capacity estimates to date have largely overlooked rates of depletion in these types of storage reservoirs and typically report the total estimated storage capacity that will be available upon depletion. However, CO2 storage will not (and cannot economically) begin until the recoverable oil and gas have been produced via traditional means. This report describes …
Date: March 5, 2007
Creator: Dahowski, Robert T. & Bachu, Stefan
Object Type: Report
System: The UNT Digital Library
Sensors for Screening and Surveillance (open access)

Sensors for Screening and Surveillance

Much attention, in fact an entire session at this conference, is being devoted to protecting the United States against human threats--individuals who may pose a danger by their mere presence on US soil. However, tomorrow's terrorists will employ weapons in their attacks, and we must also be diligent in preventing these weapons from reaching their targets. Sensors can play an important role in detecting these weapons before they achieve their desired effects. A sensor system can best be understood as a way of automating search techniques that would normally be carried out by a human's touch and vision senses, or by a dog's sniffing capabilities. The list of potential threats is long, including nuclear, biological, chemical and radiological weapons, and each presents its own challenges. However, any effective system must meet the following requirements: (1) Sensor systems must be operationally practical. Delays must be kept to a minimum. The systems must be safe to operate. Individual privacy and corporate proprietary information must be protected. The systems must be part of a viable concept of operations; i.e., they must provide information that can enable effective, preemptive actions to be taken. (2) Sensors systems must be highly sensitive, providing a low probability …
Date: March 5, 2002
Creator: Dye, D. H.
Object Type: Article
System: The UNT Digital Library
SuperShuttle CNG Fleet Study Summary: Clean Cities Alternative Fuel Information Series, Alternative Fuel Case Study (open access)

SuperShuttle CNG Fleet Study Summary: Clean Cities Alternative Fuel Information Series, Alternative Fuel Case Study

An account of the successful use of alternative fuels in a fleet of SuperShuttle passenger vans, which offer shared-rides between Boulder and Denver International Airport.
Date: March 5, 2001
Creator: Eudy, L.
Object Type: Book
System: The UNT Digital Library
Legal Issues Related to Prescription Drug Sales on the Internet (open access)

Legal Issues Related to Prescription Drug Sales on the Internet

None
Date: March 5, 2004
Creator: Feder, Jody
Object Type: Report
System: The UNT Digital Library
Missile Survey: Ballistic and Cruise Missiles of Foreign Countries (open access)

Missile Survey: Ballistic and Cruise Missiles of Foreign Countries

None
Date: March 5, 2004
Creator: Feickert, Andrew
Object Type: Report
System: The UNT Digital Library
Global Environment Facility (GEF): Overview (open access)

Global Environment Facility (GEF): Overview

The report provides an overview regarding the establishment and the role of Global Environment Facility (GEF).
Date: March 5, 2008
Creator: Fletcher, Susan R.
Object Type: Report
System: The UNT Digital Library
Working out the kinks: Understanding the fall and rise of energy use in China (open access)

Working out the kinks: Understanding the fall and rise of energy use in China

The causes of the decline in China's energy consumption between 1996 and 2000 are analyzed.
Date: March 5, 2003
Creator: Fridley, David G.; Sinton, Jonathan E. & Lewis, Joanna I.
Object Type: Article
System: The UNT Digital Library
XMM-Newton Observations Reveal the X-ray Counterpart of the Very-high-energy gamma-ray Source HESS J1640-465 (open access)

XMM-Newton Observations Reveal the X-ray Counterpart of the Very-high-energy gamma-ray Source HESS J1640-465

We present X-ray observations of the as of yet unidentified very high-energy (VHE) {gamma}-ray source HESS J1640-465 with the aim of establishing a counterpart of this source in the keV energy range, and identifying the mechanism responsible for the VHE emission. The 21.8 ksec XMM-Newton observation of HESS J1640-465 in September 2005 represents a significant improvement in sensitivity and angular resolution over previous ASCA studies in this region. These new data show a hard-spectrum X-ray emitting object at the centroid of the H.E.S.S. source, within the shell of the radio Supernova Remnant (SNR) G338.3-0.0. This object is consistent with the position and flux previously measured by both ASCA and Swift-XRT but is now shown to be significantly extended. We argue that this object is very likely the counterpart to HESS J1640-465 and that both objects may represent the Pulsar Wind Nebula of an as of yet undiscovered pulsar associated with G338.3-0.0.
Date: March 5, 2007
Creator: Funk, S.; Hinton, J. A.; Puhlhofer, G.; Aharonian, F. A.; Hofmann, W.; Reimer, O. et al.
Object Type: Article
System: The UNT Digital Library
A Parliamentary-Style Question Period: Proposals and Issues for Congress (open access)

A Parliamentary-Style Question Period: Proposals and Issues for Congress

This report surveys how question periods are conducted in Britain and other parliamentary democracies, examines previous proposals for question periods in the United States, considers potential advantages and disadvantages of a question period, and outlines some legislative considerations for policymakers considering a question period for Congress.
Date: March 5, 2009
Creator: Glassman, Matthew E.
Object Type: Report
System: The UNT Digital Library
The Federal Deposit Insurance Corporation (FDIC): Summary of Actions in Support of Housing and Financial Markets (open access)

The Federal Deposit Insurance Corporation (FDIC): Summary of Actions in Support of Housing and Financial Markets

This report discusses recent actions taken by the Federal Deposit Insurance Corporation (FDIC) in support of housing and financial markets, including: a temporary increase in deposit insurance as required by the Emergency Economic Stabilization Act of 2008 (P.L. 110-343), the resolution of bank failures, the development of the Temporary Liquidity Guarantee Program (TLGP), and efforts to reduce foreclosures.
Date: March 5, 2009
Creator: Gonzales, Oscar R. & Getter, Darryl E.
Object Type: Report
System: The UNT Digital Library
Oversight of High-Containment Biological Laboratories: Issues for Congress (open access)

Oversight of High-Containment Biological Laboratories: Issues for Congress

This report focuses on the federal government's regulation of high containment laboratories. It explains the concepts of biosecurity and biosafety, including the mechanisms by which the federal government oversees their implementation; describes the proliferation of high-containment laboratories; discusses issues facing federal policymakers; and identifies policy options for congressional consideration.
Date: March 5, 2009
Creator: Gottron, Frank & Shea, Dana A.
Object Type: Report
System: The UNT Digital Library
A Monte Carlo Method for Calculating Initiation Probability (open access)

A Monte Carlo Method for Calculating Initiation Probability

A Monte Carlo method for calculating the probability of initiating a self-sustaining neutron chain reaction has been developed. In contrast to deterministic codes which solve a non-linear, adjoint form of the Boltzmann equation to calculate initiation probability, this new method solves the forward (standard) form of the equation using a modified source calculation technique. Results from this new method are compared with results obtained from several deterministic codes for a suite of historical test problems. The level of agreement between these code predictions is quite good, considering the use of different numerical techniques and nuclear data. A set of modifications to the historical test problems has also been developed which reduces the impact of neutron source ambiguities on the calculated probabilities.
Date: March 5, 2007
Creator: Greenman, G M; Procassini, R J & Clouse, C J
Object Type: Article
System: The UNT Digital Library
The Confinement Problem in Lattice Gauge Theory (open access)

The Confinement Problem in Lattice Gauge Theory

I review investigations of the quark confinement mechanism that have been carried out in the framework of SU(N) lattice gauge theory. The special role of Z(N) center symmetry is emphasized.
Date: March 5, 2003
Creator: Greensite, J.
Object Type: Article
System: The UNT Digital Library
Business Investment and a Repeal of the Corporate Alternative Minimum Tax (open access)

Business Investment and a Repeal of the Corporate Alternative Minimum Tax

This report consists of business investment and a repeal of the corporate alternative minimum tax.
Date: March 5, 2002
Creator: Guenther, Gary
Object Type: Report
System: The UNT Digital Library
Miscoding properties of 1,N{sup 6}-ethanoadenine, a DNA adduct derived from reaction with antitumor agent 1,3-bis(2-chloroethyl)-1-nitrosourea (open access)

Miscoding properties of 1,N{sup 6}-ethanoadenine, a DNA adduct derived from reaction with antitumor agent 1,3-bis(2-chloroethyl)-1-nitrosourea

1,N{sup 6}-Ethanoadenine (EA) is an exocyclic adduct formed from DNA reaction with the antitumor agent, 1,3-bis(2-chloroethyl)-1-nitrosourea (BCNU). To understand the role of this adduct in the mechanism of mutagenicity or carcinogenicity by BCNU, an oligonucleotide with a site-specific EA was synthesized using phosphoramidite chemistry. We now report the in vitro miscoding properties of EA in translesion DNA synthesis catalyzed by mammalian DNA polymerases (pols) {alpha}, {beta}, {eta} and {iota}. These data were also compared with those obtained for the structurally related exocyclic adduct, 1,N{sup 6}-ethenoadenine ({var_epsilon}A). Using a primer extension assay, both pols {alpha} and {beta} were primarily blocked by EA or {var_epsilon}A with very minor extension. Pol {eta} a member of the Y family of polymerases, was capable of catalyzing a significant amount of bypass across both adducts. Pol {eta} incorporated all four nucleotides opposite EA and {var_epsilon}A, but with differential preferences and mainly in an error-prone manner. Human pol {iota}, a paralog of human pol {eta}, was blocked by both adducts with a very small amount of synthesis past {var_epsilon}A. It incorporated C and, to a much lesser extent, T, opposite either adduct. In addition, the presence of an A adduct, e.g. {var_epsilon}A, could affect the specificity of …
Date: March 5, 2003
Creator: Hang, Bo; Guliaev, Anton B.; Chenna, Ahmed & Singer, B.
Object Type: Article
System: The UNT Digital Library
INCREASING HEAVY OIL RESERVES IN THE WILMINGTON OIL FIELD THROUGH ADVANCED RESERVOIR CHARACTERIZATION AND THERMAL PRODUCTION TECHNOLOGIES (open access)

INCREASING HEAVY OIL RESERVES IN THE WILMINGTON OIL FIELD THROUGH ADVANCED RESERVOIR CHARACTERIZATION AND THERMAL PRODUCTION TECHNOLOGIES

The overall objective of this project is to increase heavy oil reserves in slope and basin clastic (SBC) reservoirs through the application of advanced reservoir characterization and thermal production technologies. The project involves improving thermal recovery techniques in the Tar Zone of Fault Blocks II-A and V (Tar II-A and Tar V) of the Wilmington Field in Los Angeles County, near Long Beach, California. A primary objective is to transfer technology which can be applied in other heavy oil formations of the Wilmington Field and other SBC reservoirs, including those under waterflood. The thermal recovery operations in the Tar II-A and Tar V have been relatively inefficient because of several producibility problems which are common in SBC reservoirs. Inadequate characterization of the heterogeneous turbidite sands, high permeability thief zones, low gravity oil, and nonuniform distribution of remaining oil have all contributed to poor sweep efficiency, high steam-oil ratios, and early steam breakthrough. Operational problems related to steam breakthrough, high reservoir pressure, and unconsolidated formation sands have caused premature well and downhole equipment failures. In aggregate, these reservoir and operational constraints have resulted in increased operating costs and decreased recoverable reserves. The advanced technologies to be applied include: (1) Develop three-dimensional …
Date: March 5, 2004
Creator: Hara, Scott
Object Type: Report
System: The UNT Digital Library
Chirped-Pulse Inverse Free Electron Laser: A Tabletop, High-Gradient Vacuum Laser Accelerator (open access)

Chirped-Pulse Inverse Free Electron Laser: A Tabletop, High-Gradient Vacuum Laser Accelerator

The inverse free-electron laser (IFEL) interaction is studied both theoretically and numerically in the case where the drive laser intensity approaches the relativistic regime, and the pulse duration is only a few optical cycles long. We show that by using an ultrashort, ultrahigh-intensity drive laser pulse, the IFEL interaction bandwidth and accelerating gradient are increased considerably, thus yielding large energy gains. Using a chirped pulse and negative dispersion focusing optics allows one to take further advantage of the laser optical bandwidth and produce a chromatic line focus maximizing the gradient. The combination of these novel ideas results in a compact vacuum laser accelerator capable of accelerating picosecond electron bunches with a high gradient (GeV/m) and very low energy spread. A computer code which takes into account the three-dimensional nature of the interaction is currently in development and results are expected this Spring.
Date: March 5, 2001
Creator: Hartemann, F. V.; Troha, A. L. & Baldis, H. A.
Object Type: Report
System: The UNT Digital Library
Budget Reconciliation Legislation: Development and Consideration (open access)

Budget Reconciliation Legislation: Development and Consideration

This report discusses the Development and Consideration related to Budget Reconciliation Legislation.
Date: March 5, 2001
Creator: Heniff, Bill
Object Type: Report
System: The UNT Digital Library
Allocations and Subdivisions in the Congressional Budget Process (open access)

Allocations and Subdivisions in the Congressional Budget Process

This report briefly explains how the annual budget resolution sets forth total spending and revenue levels, which are then allocated to the appropriate House and Senate committees, which in turn help Congress determine how best to enforce spending once a budget resolution is adopted.
Date: March 5, 2001
Creator: Heniff, Bill, Jr.
Object Type: Report
System: The UNT Digital Library
Basic Federal Budgeting Terminology (open access)

Basic Federal Budgeting Terminology

This report is about Basic Federal Dudgeting Terminology.
Date: March 5, 2001
Creator: Heniff, Bill, Jr.
Object Type: Report
System: The UNT Digital Library