Resource Type

Language

318 Matching Results

Results open in a new window/tab.

''Atomic Optics'': Nonimaging Optics on the Nanoscale (open access)

''Atomic Optics'': Nonimaging Optics on the Nanoscale

This is the final report for a one year close out extension of our basic research program that was established at the University of Chicago more than sixteen years ago to explore and develop the optical sub-discipline that has come to be known as ''nonimaging optics''. This program has been extremely fruitful, having both broadened the range of formalism available for workers in this field and led to the discovery of many new families of optical devices. These devices and techniques have applications wherever the efficient transport and transformation of light distributions are important, in particular in illumination, fiber optics, collection and concentration of sunlight, and the detection of faint light signals in physics and astrophysics. Over the past thirty years, Nonimaging Optics (Welford and Winston, 1989) has brought a fresh approach to the analysis of many problems in classical macro-scale optics. Through the application of phase-space concepts, statistical methods, thermodynamic arguments, etc., many previously established performance limits were able to be broken and many technical surprises with exciting practical applications were discovered. The most recent three-year phase of our long-term continuing program ended in late 2002 and emphasized extending our work in geometrical optics and expanding it to include …
Date: January 15, 2005
Creator: O'Gallagher, Roland Winston Joseph
System: The UNT Digital Library
CH-TRU Waste Content Codes (CH-TRUCON) (open access)

CH-TRU Waste Content Codes (CH-TRUCON)

The CH-TRU Waste Content Codes (CH-TRUCON) document describes the inventory of the U.S. Department of Energy (DOE) CH-TRU waste within the transportation parameters specified by the Contact-Handled Transuranic Waste Authorized Methods for Payload Control (CH-TRAMPAC). The CH-TRAMPAC defines the allowable payload for the Transuranic Package Transporter-II (TRUPACT-II) and HalfPACT packagings. This document is a catalog of TRUPACT-II and HalfPACT authorized contents and a description of the methods utilized to demonstrate compliance with the CH-TRAMPAC. A summary of currently approved content codes by site is presented in Table 1. The CH-TRAMPAC describes "shipping categories" that are assigned to each payload container. Multiple shipping categories may be assigned to a single content code. A summary of approved content codes and corresponding shipping categories is provided in Table 2, which consists of Tables 2A, 2B, and 2C. Table 2A provides a summary of approved content codes and corresponding shipping categories for the "General Case," which reflects the assumption of a 60-day shipping period as described in the CH-TRAMPAC and Appendix 3.4 of the CH-TRU Payload Appendices. For shipments to be completed within an approximately 1,000-mile radius, a shorter shipping period of 20 days is applicable as described in the CH-TRAMPAC and Appendix 3.5 …
Date: January 15, 2005
Creator: Westinghouse TRU Solutions LLC
System: The UNT Digital Library
Evaluation of Roof Bolting Requirements Based on In-Mine Bolter Drilling Progress Report (open access)

Evaluation of Roof Bolting Requirements Based on In-Mine Bolter Drilling Progress Report

In this quarter, the field, theoretical and programming works have been performed toward achieving the research goals set in the proposal. The main accomplishments in this quarter included: (1) one more field test has been conducted in an underground coal mine, (2) optimization studies of the control parameters have been conducted, (3) method to use torque to thrust ratio as indicator of rock relative hardness has also been explored, and (4) about 98% of the development work for the roof geology mapping program, MRGIS, has completed, (5) A real time roof geology mapping system for roof bolters in limestone mine, including a special version of the geology mapping program and hardware, has already been verified to perform very well in underground production condition.
Date: January 15, 2005
Creator: Peng, Syd S.
System: The UNT Digital Library
Halliburton Composite Bridge Plug Assembly (open access)

Halliburton Composite Bridge Plug Assembly

The overall objectives of this CRADA were to assist Halliburton in analyzing a composite bridge plug and to determine why their original design was failing in the field. In Phase 1, finite element analyses were done on the original composite slip design and several alternative designs. The composite slip was the component in the bridge plug that was failing. The finite element code ABAQUS was used for these calculations and I-DEAS was used as the pre- and post-processor in the analyses. Several different designs and materials were analyzed and recommendations were made towards improving the design. In Phase 2, the objective was to develop finite element models that would accurately represent the deformations in the entire all-composite 4-1/2' diameter bridge plug assembly. The finite element code LS-DYNA was used and the results from this effort were intended to expand Halliburton's composite design and analysis capabilities with regard to developing future composite components for downhole tools. In addition to the finite element modeling, this effort involved the utilization of micromechanics to determine the necessary composite material properties that were needed as input for finite element codes.
Date: January 15, 2005
Creator: Starbuck, J. M.; Luttrell, C. R. & Aramayo, G.
System: The UNT Digital Library
Hydrogen and Nitrogen Control in Ladle and Casting Operations (open access)

Hydrogen and Nitrogen Control in Ladle and Casting Operations

In recent years there has been an increasing demand to reduce and control the amount of dissolved gases in steel. Hydrogen and nitrogen are two of the most important gases which when dissolved in liquid steel affect its properties significantly. Several steelmaking additions have been investigated in this research for their effect on the hydrogen and nitrogen content of steels. It has been established that calcium hydroxide (hydrated lime) acts as a source of hydrogen. Carburizers, such as metallurgical coke, were found to result in no hydrogen pickup when added to liquid steel. Addition of petroleum coke, on the other hand, increased the hydrogen content of liquid steel. Ferroalloy such as medium carbon ferromanganese when added to the liquid iron was found to increase its nitrogen content, the increase being proportional to the amount of ferroalloy added. Similarly, addition of pitch coke, which had a significant nitrogen impurity, increased the nitrogen content of liquid iron. A mathematical model was developed to quantify the absorption of nitrogen and hydrogen from the air bubbles entrained during tapping of liquid steel. During the bottom stirring of liquid metal in a ladle, the inert gas escaping from the top displaces the slag layer and …
Date: January 15, 2005
Creator: Fruehan, Richard J. & Misra, Siddhartha
System: The UNT Digital Library
Neutron Capture Experiments on Unstable Nuclei (open access)

Neutron Capture Experiments on Unstable Nuclei

The overall objective of this project is the measurement of neutron capture cross sections of importance to stewardship science and astrophysical modeling of nucleosynthesis, while at the same time helping to train the next generation of scientists with expertise relevant to U.S. national nuclear security missions and to stewardship science. A primary objective of this project is to study neutron capture cross sections for various stable and unstable isotopes that will contribute to the Science Based Stockpile Stewardship (SBSS) program by providing improved data for modeling and interpretation of nuclear device performance. Much of the information obtained will also be important in astrophysical modeling of nucleosynthesis. Measurements of these neutron capture cross sections are being conducted in collaboration with researchers at the Los Alamos Neutron Science Center (LANSCE) facility using the unique Detector for Advanced Neutron Capture Experiments (DANCE). In our early discussions with the DANCE group, decisions were made on the first cross sections to be measured and how our expertise in target preparation, radiochemical separations chemistry, and data analysis could best be applied. The initial emphasis of the project was on preparing suitable targets of both natural and separated stable europium isotopes in preparation for the ultimate goal …
Date: January 15, 2005
Creator: Schwantes, Jon M.; Sudowe, Ralf; Folden, Charles M., III; Nitsche, Heino & Hoffman, Darleane C.
System: The UNT Digital Library
Report on Texas Bridges as of September 2004 (open access)

Report on Texas Bridges as of September 2004

This report describes bridges and their conditions in Texas. The report provides information on the types of bridges, integrity of them, and prioritizes their need for upgrade.
Date: January 15, 2005
Creator: Texas. Department of Transportation.
System: The Portal to Texas History
The Broader Middle East and North Africa Initiative: An Overview (open access)

The Broader Middle East and North Africa Initiative: An Overview

The Broader Middle East and North Africa Initiative (BMENA) is a multilateral development and reform plan aimed at fostering economic and political liberalization in a wide geographic area of Arab and non-Arab Muslim countries. In December 2004, the first BMENA meeting took place in Rabat, Morocco and was called the “Forum for the Future.”At the forum, foreign ministers and finance ministers of the countries in the region stretching from Morocco to Pakistan as well as from the countries of the G8 pledged to create several new development programs and committed $60 million to a regional fund for business development. Critics of BMENA contend that the initiative focuses too heavily on economic issues instead of political reform and does little to strengthen non-governmental organizations and civil society groups in Arab and non- Arab Muslim countries.
Date: February 15, 2005
Creator: Sharp, Jeremy M.
System: The UNT Digital Library
Ceramic Laser Materials (open access)

Ceramic Laser Materials

Transparent ceramic materials have several major advantages over single crystals in laser applications, not the least of which is the ability to make large aperture parts in a robust manufacturing process. After more than a decade of working on making transparent YAG:Nd, Japanese workers have recently succeeded in demonstrating samples that performed as laser gain media as well as their single crystal counterparts. Since then several laser materials have been made and evaluated. For these reasons, developing ceramic laser materials is the most exciting and futuristic materials topic in today's major solid-state laser conferences. We have established a good working relationship with Konoshima Ltd., the Japanese producer of the best ceramic laser materials, and have procured and evaluated slabs designed by us for use in our high-powered SSHCL. Our measurements indicate that these materials will work in the SSHCL, and we have nearly completed retrofitting the SSHCL with four of the largest transparent ceramic YAG:Nd slabs in existence. We have also begun our own effort to make this material and have produced samples with various degrees of transparency/translucency. We are in the process of carrying out an extensive design-of-experiments to establish the significant process variables for making transparent YAG. Finally …
Date: February 15, 2005
Creator: Soules, T F; Clapsaddle, B J; Landingham, R L & Schaffers, K I
System: The UNT Digital Library
Contract Management: The Air Force Should Improve How It Purchases AWACS Spare Parts (open access)

Contract Management: The Air Force Should Improve How It Purchases AWACS Spare Parts

A letter report issued by the Government Accountability Office with an abstract that begins "Over the past several years, the Air Force has negotiated and awarded more than $23 million in contracts to the Boeing Corporation for the purchase of certain spare parts for its Airborne Warning and Control System (AWACS) aircraft. Since they first became operational in March 1977, AWACS aircraft have provided U.S. and allied defense forces with the ability to detect, identify, and track airborne threats. In March 2003, GAO received allegations that the Air Force was overpaying Boeing for AWACS spare parts. This report provides the findings of GAO's review into these allegations. Specifically, GAO identified spare parts price increases and determined whether the Air Force obtained and evaluated sufficient information to ensure the prices were fair and reasonable. GAO also determined the extent to which competition was used to purchase the spare parts."
Date: February 15, 2005
Creator: United States. Government Accountability Office.
System: The UNT Digital Library
Density Measurements of Be Shells (open access)

Density Measurements of Be Shells

The purpose of this memo is to lay out the uncertainties associated with the measurement of density of Be ablators by the weigh and volume method. I am counting on the readers to point out any faulty assumptions about the techniques or uncertainties associated with them. Based on the analysis presented below we should expect that 30 {micro}m thick shells will have an uncertainty in the measured density of about 2% of the value, coming more or less equally from the mass and volume measurement. The uncertainty is roughly inversely proportional to the coating thickness, thus a 60 {micro}m walled shell would result in a 1% uncertainty in the density.
Date: February 15, 2005
Creator: Cook, R C
System: The UNT Digital Library
Energy efficiency improvement and cost saving opportunities forpetroleum refineries (open access)

Energy efficiency improvement and cost saving opportunities forpetroleum refineries

The petroleum refining industry in the United States is the largest in the world, providing inputs to virtually any economic sector,including the transport sector and the chemical industry. The industry operates 146 refineries (as of January 2004) around the country,employing over 65,000 employees. The refining industry produces a mix of products with a total value exceeding $151 billion. Refineries spend typically 50 percent of cash operating costs (i.e., excluding capital costs and depreciation) on energy, making energy a major cost factor and also an important opportunity for cost reduction. Energy use is also a major source of emissions in the refinery industry making energy efficiency improvement an attractive opportunity to reduce emissions and operating costs. Voluntary government programs aim to assist industry to improve competitiveness through increased energy efficiency and reduced environmental impact. ENERGY STAR (R), a voluntary program managed by the U.S. Environmental Protection Agency, stresses the need for strong and strategic corporate energy management programs. ENERGY STAR provides energy management tools and strategies for successful corporate energy management programs. This Energy Guide describes research conducted to support ENERGY STAR and its work with the petroleum refining industry.This research provides information on potential energy efficiency opportunities for petroleum refineries. …
Date: February 15, 2005
Creator: Worrell, Ernst & Galitsky, Christina
System: The UNT Digital Library
Final Technical Report - "Determining How Magnetic Helicity Injection Really Works" (open access)

Final Technical Report - "Determining How Magnetic Helicity Injection Really Works"

This research program involved direct observation of the complicated plasma dynamics underlying spheromak formation. Spheromaks are self-organizing magnetically dominated plasma configurations which potentially offer a simple, low-cost means for confining the plasma in a controlled thermonuclear fusion reactor. The spheromak source used in these studies was a coaxial co-planar magnetized plasma gun which was specifically designed to have the simplest relevant geometry. The simplicity of the geometry facilitated understanding of the basic physics and minimized confusion that would otherwise have resulted from complexities due to the experimental geometry. The coaxial plasma gun was mounted on one end of a large vacuum tank that had excellent optical access so the spheromak formation process could be tracked in detail using ultra-high speed cameras. The main accomplishments of this research program were (1) obtaining experimental data characterizing the detailed physics underlying spheromak formation and the development of new theoretical models motivated by these observations, (2) determining the relationship between spheromak physics and astrophysical jets, (3) developing a new high-speed camera diagnostic for the SSPX spheromak at the Lawrence Livermore National Lab, and (4) training graduate students and postdoctoral fellows.
Date: February 15, 2005
Creator: Bellan, Paul M.
System: The UNT Digital Library
Head Start: Background and Issues (open access)

Head Start: Background and Issues

This report discusses the federal "Head Start" program that has provided comprehensive early childhood development services to low-income children since 1965. The Head Start program has received increases of varying levels over the past two decades.
Date: February 15, 2005
Creator: Gish, Melinda
System: The UNT Digital Library
Homeland Security: Protecting Airliners from Terrorist Missiles (open access)

Homeland Security: Protecting Airliners from Terrorist Missiles

Recent events have focused attention on the threat that terrorists with shoulder fired surface-to-air missiles (SAMs), referred to as Man-Portable Air Defense Systems (MANPADS), pose to commercial airliners. This report discusses SAMs and examines options for mitigating missile threats.
Date: February 15, 2005
Creator: Bolkcom, Christopher; Feickert, Andrew & Elias, Bartholomew
System: The UNT Digital Library
House Rules Changes Affecting Floor Procedures in the 109th Congress (open access)

House Rules Changes Affecting Floor Procedures in the 109th Congress

On the first day of the 109th Congress, the House agreed to H.Res. 5, which made several rules changes affecting floor proceedings. These modifications include allowing committees to adopt rules giving chairs the general authority to make the motion necessary to send a measure to the conference; adding Wednesdays to the permissible days on which suspension motions may be entertained; eliminating the Corrections Calendar; amending the rules of decorum and debate regarding references to the Senate and its members; and granting the Speaker added authority to postpone votes on certain questions.
Date: February 15, 2005
Creator: Carr, Thomas P. & Rybicki, Elizabeth
System: The UNT Digital Library
The Influence of Selected Liquid and Soil Properties on the Propagation of Spills over Flat Permeable Surfaces (open access)

The Influence of Selected Liquid and Soil Properties on the Propagation of Spills over Flat Permeable Surfaces

In an effort to determine spill characteristics, information about a spill's spatial distribution with time is being studied. For permeable surfaces, spill phenomenology is controlled by liquid and soil properties, the most relevant of which are presented in this report. The pertinent liquid and soil properties were tabulated for ten liquids and four soils. The liquids represented an array of organic compounds, some of which are or are soon to be documented in the liquid spectra library by the Environmental Molecular Science Laboratory at Pacific Northwest National Laboratory. The soils were chosen based on ongoing surface spectra work and to represent a range of relevant soil properties. The effect of the liquid and soil properties on spill phenomenology were explored using a spill model that couples overland flow described by gravity currents with the Green-Ampt infiltration model. From the simulations, liquid viscosity was found to be a controlling liquid property in determining the amount of time a spill remains on the surface, with the surface vanish time decreasing as viscosity decreased. This was attributed to decreasing viscosity increasing both the hydraulic conductivity of the soil and allowing for the spill to more quickly spread out onto an unsaturated soil surface. …
Date: February 15, 2005
Creator: Keller, Jason M. & Simmons, Carver S.
System: The UNT Digital Library
An integrative approach to energy, carbon, and redox metabolism in the cyanobacterium Synechocystis sp. PCC 6803 (open access)

An integrative approach to energy, carbon, and redox metabolism in the cyanobacterium Synechocystis sp. PCC 6803

The team of the Fellowship for Interpretation of Genomes (FIG) under the leadership of Ross Overbeek, began working on this Project in November 2003. During the previous year, the Project was performed at Integrated Genomics Inc. A transition from the industrial environment to the public domain prompted us to adjust some aspects of the Project. Notwithstanding the challenges, we believe that these adjustments had a strong positive impact on our deliverables. Most importantly, the work of the research team led by R. Overbeek resulted in the deployment of a new open source genomic platform, the SEED (Specific Aim 1). This platform provided a foundation for the development of CyanoSEED a specialized portal to comparative analysis and metabolic reconstruction of all available cyanobacterial genomes (Specific Aim 3). The SEED represents a new generation of software for genome analysis. Briefly, it is a portable and extendable system, containing one of the largest and permanently growing collections of complete and partial genomes. The complete system with annotations and tools is freely available via browsing or via installation on a user's Mac or Linux computer. One of the important unique features of the SEED is the support of metabolic reconstruction and comparative genome analysis …
Date: February 15, 2005
Creator: Ross Overbeek, Veronika Fonstein, Andrei Osterman, Svetlana Gerdes, Olga Vassieva, Olga Zagnitko, Dmitry Rodionov
System: The UNT Digital Library
Medicaid and SCHIP: The President’s FY2006 Budget Proposals (open access)

Medicaid and SCHIP: The President’s FY2006 Budget Proposals

This report describes the proposal and provides an estimate of the cost or savings based on publicly available information. The report provides a brief background for the proposal and provides a listing of current Congressional Research Service (CRS) reports related to the proposal.
Date: February 15, 2005
Creator: Grady, April; Hearne, Jean P.; Herz, Elicia J.; Scott, Christine; Stone-Axelrad, Julie & Tritz, Karen
System: The UNT Digital Library
Medicaid Expenditures, FY2002 and FY2003 (open access)

Medicaid Expenditures, FY2002 and FY2003

Medicaid is a health insurance program jointly funded by the states and the federal government. Generally, eligibility is limited to low-income children, pregnant women, parents of dependent children, people with disabilities, and the elderly. Each state designs and administers its own program within broad federal guidelines.
Date: February 15, 2005
Creator: Tritz, Karen
System: The UNT Digital Library
Restoring Sustainable Forests on Appalachian Mined Lands for Wood Products, Renewable Energy, Carbon Sequestration, and Other Ecosystems Services Quarterly Report (open access)

Restoring Sustainable Forests on Appalachian Mined Lands for Wood Products, Renewable Energy, Carbon Sequestration, and Other Ecosystems Services Quarterly Report

The overall purpose of this project is to evaluate the biological and economic feasibility of restoring high-quality forests on mined land, and to measure carbon sequestration and wood production benefits that would be achieved from forest restoration procedures. During the reporting period (October-December 2004) we completed the validation of a forest productivity classification model for mined land. A coefficient of determination (R{sup 2}) of 0.68 confirms the model's ability to predict SI based on a selection of mine soil properties. To determine carbon sequestration under different forest management scenarios, a field study was installed as a 3 x 3 factorial in a random complete block design with three replications at each of three locations, Ohio (Figure 1), West Virginia (Figure 2), and Virginia (Figure 3). The treatments included three forest types (white pine, hybrid poplar, mixed hardwood) and three silvicultural regimes (competition control, competition control plus tillage, competition control plus tillage plus fertilization). For hybrid poplar, total plant biomass differences increased significantly with the intensity of silvicultural input. Root, stem, and foliage biomass also increased with the level of silvicultural intensity. Financial feasibility analyses of reforestation on mined lands previously reclaimed to grassland have been completed for conversion to white …
Date: February 15, 2005
Creator: Burger, James A.; Galbraith, J.; Fox, T.; Amacher, G.; Sullivan, J. & Zipper, C.
System: The UNT Digital Library
The Safe and Drug-Free Schools and Communities Act: Reauthorization and Appropriations (open access)

The Safe and Drug-Free Schools and Communities Act: Reauthorization and Appropriations

This report discusses the 107th Congress the Safe and Drug-Free Schools and Communities Act reauthorization and appropriations to fun the the Safe and Drug-Free Schools and Communities Act program, and possible 110th Congress reauthorization issues. Updated: 02/15/2005
Date: February 15, 2005
Creator: Cooper, Edith Fairman
System: The UNT Digital Library
Aviation Security: Systematic Planning Needed to Optimize the Deployment of Checked Baggage Screening Systems (open access)

Aviation Security: Systematic Planning Needed to Optimize the Deployment of Checked Baggage Screening Systems

A letter report issued by the Government Accountability Office with an abstract that begins "Mandated to screen all checked baggage using explosive detection systems at airports by December 31, 2003, the Transportation Security Administration (TSA) deployed two types of screening equipment: explosives detection systems (EDS), which use computer-aided tomography X-rays to recognize the characteristics of explosives, and explosives trace detection (ETD) systems, which use chemical analysis to detect traces of explosive material vapors or residues. This report assesses (1) TSA's use of budgeted funds to install EDS and ETD systems and the impact of initially deploying these systems, (2) TSA and airport actions to install EDS machines in-line with baggage conveyor systems, and the federal resources made available for this purpose, and (3) actions taken by TSA to optimally deploy checked baggage screening systems."
Date: March 15, 2005
Creator: United States. Government Accountability Office.
System: The UNT Digital Library
CH-TRU Waste Content Codes (CH-TRUCON) (open access)

CH-TRU Waste Content Codes (CH-TRUCON)

The CH-TRU Waste Content Codes (CH-TRUCON) document describes the inventory of the U.S. Department of Energy (DOE) CH-TRU waste within the transportation parameters specified by the Contact-Handled Transuranic Waste Authorized Methods for Payload Control (CH-TRAMPAC). The CH-TRAMPAC defines the allowable payload for the Transuranic Package Transporter-II (TRUPACT-II) and HalfPACT packagings. This document is a catalog of TRUPACT-II and HalfPACT authorized contents and a description of the methods utilized to demonstrate compliance with the CH-TRAMPAC. A summary of currently approved content codes by site is presented in Table 1. The CH-TRAMPAC describes "shipping categories" that are assigned to each payload container. Multiple shipping categories may be assigned to a single content code. A summary of approved content codes and corresponding shipping categories is provided in Table 2, which consists of Tables 2A, 2B, and 2C. Table 2A provides a summary of approved content codes and corresponding shipping categories for the "General Case," which reflects the assumption of a 60-day shipping period as described in the CH-TRAMPAC and Appendix 3.4 of the CH-TRU Payload Appendices. For shipments to be completed within an approximately 1,000-mile radius, a shorter shipping period of 20 days is applicable as described in the CH-TRAMPAC and Appendix 3.5 …
Date: March 15, 2005
Creator: Westinghouse TRU Solutions LLC
System: The UNT Digital Library