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Canted Undulator Front-End Exit-Mask Flow-Induced Vibration Measurements.
All of the high-heat-load critical components in the new canted-undulator front-end (CU FE) design use wire-coil inserts inside of the cooling channels to significantly enhance heat transfer. Wire-coil inserts have replaced the copper-mesh inserts used in previous front-end high-heat-load critical-component designs. The exit mask, the most downstream component in the CU FE line relative to the x-ray beam path, has an exit aperture of 2 mm vertical x 3 mm horizontal and is the most sensitive component, in terms of final beam stability, of all of the CU FE components. In general, final beam stability is determined by the storage-ring output-beam stability and not by the CU FE components. Although front-end components are not very sensitive to vibration, several measurements have been performed to assess the flow-induced vibration associated with the CU FE exit mask. Results yield only 0.16 {micro}mrms vertical displacement and 1.0 {micro}mrms horizontal displacement under worst-case conditions. The maximum displacement values are very small compared to the aperture size, and therefore flow-induced vibration has a negligible effect on the CU FE output beam stability. More general measurements have also been performed to directly compare flow-induced vibration in an open, unrestricted tube relative to the same tube containing …
Date:
November 10, 2004
Creator:
Collins, J.; Doose, C. L.; Attig, J. N. & Baehl, M. M.
Object Type:
Report
System:
The UNT Digital Library
Cherokeean Herald (Rusk, Tex.), Vol. 155, No. 38, Ed. 1 Wednesday, November 10, 2004
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
November 10, 2004
Creator:
Whitehead, Marie
Object Type:
Newspaper
System:
The Portal to Texas History
The Colony Courier-Leader (The Colony, Tex.), Vol. 23, No. 40, Ed. 1 Wednesday, November 10, 2004
Weekly newspaper from The Colony, Texas that includes local, state, and national news along with advertising.
Date:
November 10, 2004
Creator:
Sorter, Dave
Object Type:
Newspaper
System:
The Portal to Texas History
Correlation of Laser-Induced Damage to Phase Objects in Bulk Fused Silica
The Optical Sciences Laser (OSL) Upgrade facility, described in last year's proceedings, is a kJ-class, large aperture (100cm{sup 2}) laser system that can accommodate prototype optical components for large-scale inertial confinement fusion lasers. High-energy operation of such lasers is often limited by damage to the optical components. Recent experiments on the OSL Upgrade facility using fused silica components at 4 J/cm{sup 2} (351-nm, 3-ns) have created output surface and bulk damage sites that have been correlated to phase objects in the bulk of the material. Optical Path Difference (OPD) measurements of the phase defects indicate the probability of laser-induced damage is strongly dependent on OPD.
Date:
November 10, 2004
Creator:
Nostrand, M. C.; Cerjan, C. J.; Johnson, M. A.; Suratwala, T. I.; Weiland, T. L.; Sell, W. D. et al.
Object Type:
Article
System:
The UNT Digital Library
The Cuero Record (Cuero, Tex.), Vol. 110, No. 45, Ed. 1 Wednesday, November 10, 2004
Weekly newspaper from Cuero, Texas that includes local, state, and national news along with advertising.
Date:
November 10, 2004
Creator:
Rea, Glenn
Object Type:
Newspaper
System:
The Portal to Texas History
Database/Template Protocol to Automate Development of Complex Environmental Input Models
At the U.S. Department of Energy Savannah River Site, complex environmental models were required to analyze the performance of a suite of radionuclides, including decay chains consisting of multiple radionuclides. To facilitate preparation of the model for each radionuclide a sophisticated protocol was established to link a database containing material information with a template. The protocol consists of data and special commands in the template, control information in the database and key selection information in the database. A preprocessor program reads a template, incorporates the appropriate information from the database and generates the final model. In effect, the database/template protocol forms a command language. That command language typically allows the user to perform multiple independent analyses merely by setting environmental variables to identify the nuclides to be analyzed and having the template reference those environmental variables. The environmental variables ca n be set by a batch or script that serves as a shell to analyze each radionuclide in a separate subdirectory (if desired) and to conduct any preprocessing and postprocessing functions. The user has complete control to generate the database and how it interacts with the template. This protocol was valuable for analyzing multiple radionuclides for a single disposal unit. …
Date:
November 10, 2004
Creator:
COLLARD, LEONARD
Object Type:
Article
System:
The UNT Digital Library
Design of an Illumination Technique to Improve the Identification of Surface Flaws on Optics
An edge illumination technique has been designed using a monochromatic light source that improves the identification of surface flaws on optics. The system uses a high-resolution CCD camera to capture images of the optics. Conventional edge illumination methods using white light sources have been plagued by light leaking around the optics causing high background levels. The background combined with lower resolution cameras has made it difficult to determine size and intensity characteristics of the flaws. Thus photographs taken of the optics are difficult to analyze quantitatively and do not allow for the detection of small, faintly illuminated sites. Infrared diodes have been utilized to illuminate large-scale (43 cm x 43 cm) fused silica optics, and a two-dimensional array CCD camera has been used to collect the image data. Flaw sizes as small as {approx}10 {micro}m have been detected. A set of frames has been built to support the infrared sources where one diode array per side is magnetically attached to the frame. The diodes inject light into the optic causing the sites to illuminate, which can be detected by the camera. A customized mounting design has been implemented to secure the frames to the stage, or base, for image acquisition. …
Date:
November 10, 2004
Creator:
Prasad, R R; Bernacil, M; Halpin, J; Peterson, J; Mills, S & Hackel, R P
Object Type:
Article
System:
The UNT Digital Library
Effect of Surface Stress Mitigation on the Corrosion Behavior of Alloy 22
When metallic plates are welded, for example using the Gas Tungsten Arc Welding (GTAW) process, residual tensile stresses may develop in the vicinity of the weld seam. Processes such as Low Plasticity Burnishing (LPB) and Laser Shock Peening (LSP) could be applied locally to eliminate the residual stresses produced by welding. In this study, Alloy 22 (N06022) plates were welded and then the above-mentioned surface treatments were applied to eliminate the residual tensile stresses. The aim of the current study was to comparatively test the corrosion behavior of as-welded (ASW) plates with the corrosion behavior of plates with stress mitigated surfaces. Immersion and electrochemical tests were performed. Results from both general and localized corrosion tests show that the corrosion resistance of the mitigated plates was not affected by the surface treatments applied.
Date:
November 10, 2004
Creator:
Fix, D. V.; Yilmaz, A.; Wong, L. L.; Estill, J. C. & Rebak, R. B.
Object Type:
Article
System:
The UNT Digital Library
Effect on scattering of complex morphology of DKDP bulk damage sites
Bulk damage sites in frequency conversion crystals scatter and/or absorb laser light leading to interference and downstream intensification .We find that laser induced bulk damage sites in DKDP exhibit a 'shell' of structurally and/or chemically modified material surrounding a central core as indicated by SEM and optical micrographs and micro Raman spectral maps. We hypothesize that the modified material has been shock wave densified and estimate the amount of densification and its effect on scattering. A simple model indicates that densification of several percent is likely and that the scattering cross section may be larger than the geometric area of the inner core by an order of magnitude.
Date:
November 10, 2004
Creator:
Carr, C W; Feit, M D; Muyco, J J & Rubenchik, A M
Object Type:
Article
System:
The UNT Digital Library
Ensemble: 2004-11-10 – Concert Band
Access:
Use of this item is restricted to the UNT Community
Concert Band performance at the UNT College of Music Winspear Performance Hall.
Date:
November 10, 2004
Creator:
University of North Texas. Concert Band.
Object Type:
Sound
System:
The UNT Digital Library
The Express-Star (Chickasha, Okla.), Ed. 1 Wednesday, November 10, 2004
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 10, 2004
Creator:
Bush, Kent
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Federal Participation in LEED
The federal government has been an active participant in the development and use of USGBC's Leadership in Energy & Environmental Design Green Building Rating System (LEED). This paper presents a review of this participation and some expectations for ongoing partnership.
Date:
November 10, 2004
Creator:
Payne, Christopher & Dyer, Beverly
Object Type:
Article
System:
The UNT Digital Library
Financial Audit: IRS's Fiscal Years 2004 and 2003 Financial Statements
A letter report issued by the Government Accountability Office with an abstract that begins "Because of the significance of Internal Revenue Service (IRS) collections to federal receipts and, in turn, to the consolidated financial statements of the U.S. government, which GAO is required to audit, and Congress's interest in financial management at IRS, GAO audits IRS's financial statements annually to determine whether (1) the financial statements IRS prepares are reliable, (2) IRS management maintained effective internal controls, and (3) IRS complies with selected provisions of significant laws and regulations and its financial systems comply with the Federal Financial Management Improvement Act of 1996 (FFMIA)."
Date:
November 10, 2004
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Force Structure: Navy Needs to Fully Evaluate Options and Provide Standard Guidance for Implementing Surface Ship Rotational Crewing
A letter report issued by the Government Accountability Office with an abstract that begins "The Navy has traditionally maintained overseas presence by deploying ships for 6 months. Rotating crews aboard ships that remain deployed for longer periods is an alternative the Navy could pursue to increase the utilization of ships. Senior Navy officials have also cited crew rotations as a way to reduce part of the Navy's plans for a larger force structure and reportedly free billions of dollars for other priorities. On its own initiative, GAO examined the Navy's efforts to evaluate and implement several rotational crewing options and the impacts of ship maintenance on extended rotational crewing deployments."
Date:
November 10, 2004
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
General Aviation Security: Increased Federal Oversight Is Needed, but Continued Partnership with the Private Sector Is Critical to Long-Term Success
A letter report issued by the Government Accountability Office with an abstract that begins "Federal intelligence agencies have reported that in the past, terrorists have considered using general aviation aircraft (all aviation other than commercial and military) for terrorist acts, and that the September 11th terrorists learned to fly at general aviation flight schools. The questions GAO answered regarding the status of general aviation security included (1) What actions has the federal government taken to identify and assess threats to, and vulnerabilities of, general aviation; and communicate that information to stakeholders? (2) What steps has the federal government taken to strengthen general aviation security, and what, if any, challenges does the government face; and (3) What steps have non-federal stakeholders taken to enhance the security of general aviation?"
Date:
November 10, 2004
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Genetic Augmentation of Syringyl Lignin in Low-lignin Aspen Trees, Final Report
As a polysaccharide-encrusting component, lignin is critical to cell wall integrity and plant growth but also hinders recovery of cellulose fibers during the wood pulping process. To improve pulping efficiency, it is highly desirable to genetically modify lignin content and/or structure in pulpwood species to maximize pulp yields with minimal energy consumption and environmental impact. This project aimed to genetically augment the syringyl-to-guaiacyl lignin ratio in low-lignin transgenic aspen in order to produce trees with reduced lignin content, more reactive lignin structures and increased cellulose content. Transgenic aspen trees with reduced lignin content have already been achieved, prior to the start of this project, by antisense downregulation of a 4-coumarate:coenzyme A ligase gene (Hu et al., 1999 Nature Biotechnol 17: 808- 812). The primary objective of this study was to genetically augment syringyl lignin biosynthesis in these low-lignin trees in order to enhance lignin reactivity during chemical pulping. To accomplish this, both aspen and sweetgum genes encoding coniferaldehyde 5-hydroxylase (Osakabe et al., 1999 PNAS 96: 8955-8960) were targeted for over-expression in wildtype or low-lignin aspen under control of either a constitutive or a xylem-specific promoter. A second objective for this project was to develop reliable and cost-effective methods, such as …
Date:
November 10, 2004
Creator:
Tsai, Chung-Jui; Davis, Mark F. & Chiang, Vincent L.
Object Type:
Report
System:
The UNT Digital Library
The Goldthwaite Eagle (Goldthwaite, Tex.), Vol. 109, No. 18, Ed. 1 Wednesday, November 10, 2004
Weekly newspaper from Goldthwaite, Texas that includes local, state, and national news along with extensive advertising.
Date:
November 10, 2004
Creator:
Bridges, G. Frank & Bridges, Georgie
Object Type:
Newspaper
System:
The Portal to Texas History
Growth of laser initiated damage in fused silica at 1053 nm
The effective lifetime of a laser optic is limited by both laser-induced damage and the subsequent growth of laser initiated damage sites. We have measured the growth rate of laser-induced damage on polished fused silica surfaces in 10 torr of air at 1053 nm at 10 ns. The data shows exponential growth in the lateral size of the damage site with shot number above a threshold fluence. The size of the initial damage influences the threshold for growth. We will compare the growth rates for input and output surface damage. Possible reasons for the observed growth behavior are discussed.
Date:
November 10, 2004
Creator:
Norton, M A; Donohue, E E; Hollingsworth, W G; Feit, M D; Rubenchik, A M & Hackel, R P
Object Type:
Article
System:
The UNT Digital Library
High-Performance Phylogeny Reconstruction
Under the Alfred P. Sloan Fellowship in Computational Biology, I have been afforded the opportunity to study phylogenetics--one of the most important and exciting disciplines in computational biology. A phylogeny depicts an evolutionary relationship among a set of organisms (or taxa). Typically, a phylogeny is represented by a binary tree, where modern organisms are placed at the leaves and ancestral organisms occupy internal nodes, with the edges of the tree denoting evolutionary relationships. The task of phylogenetics is to infer this tree from observations upon present-day organisms. Reconstructing phylogenies is a major component of modern research programs in many areas of biology and medicine, but it is enormously expensive. The most commonly used techniques attempt to solve NP-hard problems such as maximum likelihood and maximum parsimony, typically by bounded searches through an exponentially-sized tree-space. For example, there are over 13 billion possible trees for 13 organisms. Phylogenetic heuristics that quickly analyze large amounts of data accurately will revolutionize the biological field. This final report highlights my activities in phylogenetics during the two-year postdoctoral period at the University of New Mexico under Prof. Bernard Moret. Specifically, this report reports my scientific, community and professional activities as an Alfred P. Sloan Postdoctoral …
Date:
November 10, 2004
Creator:
Williams, Tiffani L.
Object Type:
Report
System:
The UNT Digital Library
House Committee Markup: Amendment Procedure
This report focuses on the amendment procedure of the house committee markup.
Date:
November 10, 2004
Creator:
Schneider, Judy
Object Type:
Report
System:
The UNT Digital Library
House Committee Markup: Vehicle for Consideration and Amendment
This report provides a brief overview of the vehicle for consideration and amendment on the house committee markup.
Date:
November 10, 2004
Creator:
Schneider, Judy
Object Type:
Report
System:
The UNT Digital Library
In-situ surface debris inspection and removal system for upward-facing transport mirrors of the National Ignition Facility
We describe a system to inspect and remove surface debris in-situ from the surfaces of upward-facing mirrors that transport 1053 nm laser light to the target chamber of the National Ignition Facility (NIF) at the Lawrence Livermore National Laboratory. Grazing angle (2-5{sup o}) illumination with a bar light highlights debris {approx}10 {micro}m in size and larger, which is then viewed through windows in the enclosures of selected mirrors. Debris is removed with 1-second bursts of high velocity (76 m/s) clean air delivered across the optic surfaces by a commercially available linear nozzle (''gas knife''). Experiments with aluminum, stainless steel, glass and polystyrene particles of various sizes >30 {micro}m show that particle removal efficiency is near 100% over most of the mirror surfaces for all sizes tested.
Date:
November 10, 2004
Creator:
Gourdin, W H; Dzenitis, E; Martin, D; Listiyo, K; Sherman, G; Kent, W et al.
Object Type:
Article
System:
The UNT Digital Library
Informing Our Nation: Improving How to Understand and Assess the USA's Position and Progress
A chapter report issued by the Government Accountability Office with an abstract that begins "There has been growing activity and interest in developing a system of key national indicators that would provide an independent, trusted, reliable, widely available, and usable source of information. Such a system would facilitate fact-based assessments of the position and progress of the United States, on both an absolute and relative basis. This interest emerges from the following perspectives. The nation's complex challenges and decisions require more sophisticated information resources than are now available. Large investments have been made in indicators on a variety of topics ranging from health and education to the economy and the environment that could be aggregated and disseminated in ways to better inform the nation. The United States does not have a national system that assembles key information on economic, environmental, and social and cultural issues. Congressional and other leaders recognized that they could benefit from the experiences of others who have already developed and implemented such key indicator systems. GAO was asked to conduct a study on: (1) The state of the practice in these systems in the United States and around the world, (2) Lessons learned and implications for …
Date:
November 10, 2004
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Iraq: Missiles, Unmanned Aerial Vehicles (UAVs) and The Iraq Survey Group Reports
None
Date:
November 10, 2004
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library