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3(omega) Damage: Growth Mitigation
The design of high power UV laser systems is limited to a large extent by the laser-initiated damage performance of transmissive fused silica optical components. The 3{omega} (i.e., the third harmonic of the primary laser frequency) damage growth mitigation LDRD effort focused on understanding and reducing the rapid growth of laser-initiated surface damage on fused silica optics. Laser-initiated damage can be discussed in terms of two key issues: damage initiated at some type of precursor and rapid damage growth of the damage due to subsequent laser pulses. The objective of the LDRD effort has been the elucidation of laser-induced damage processes in order to quantify and potentially reduce the risk of damage to fused silica surfaces. The emphasis of the first two years of this effort was the characterization and reduction of damage initiation. In spite of significant reductions in the density of damage sites on polished surfaces, statistically some amount of damage initiation should always be expected. The early effort therefore emphasized the development of testing techniques that quantified the statistical nature of damage initiation on optical surfaces. This work led to the development of an optics lifetime modeling strategy that has been adopted by the NIF project to …
Date:
February 22, 2001
Creator:
Kozlowski, M; Demos, S; Wu, Z-L; Wong, J; Penetrante, B & Hrubesh, L
Object Type:
Report
System:
The UNT Digital Library
15th Street News (Midwest City, Okla.), Vol. 30, No. 14, Ed. 1 Friday, February 2, 2001
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
February 2, 2001
Creator:
Baldwin, Alisha
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
15th Street News (Midwest City, Okla.), Vol. 30, No. 15, Ed. 1 Friday, February 9, 2001
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
February 9, 2001
Creator:
Baldwin, Alisha
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
15th Street News (Midwest City, Okla.), Vol. 30, No. 16, Ed. 1 Friday, February 16, 2001
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
February 16, 2001
Creator:
Baldwin, Alisha
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
15th Street News (Midwest City, Okla.), Vol. 30, No. 17, Ed. 1 Friday, February 23, 2001
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
February 23, 2001
Creator:
Baldwin, Alisha
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
1999 Annual Site Environmental Report, Sandia National Laboratories, Albuquerque, New Mexico
None
Date:
February 1, 2001
Creator:
Duncan, Dianne K.; Sanchez, Rebecca D. & Fink, Charles H.
Object Type:
Report
System:
The UNT Digital Library
2000 Transportation Baseline Report (DOE/ID-10754), 2000 Transporation Challenges,
The 2000 U. S. Department of Energy (DOE) Environmental Management (EM) Waste and Materials Disposition “Transportation Challenges” report is provided as an update to or status report on the transportation “barriers” analysis conducted in October 1999 and published in November 1999 as the National Transportation Program (NTP) Transportation Challenges “Problems Tied to Disposition Pathways.” Much of the programmatic information concerning the “barriers” or, more accurately, “issues,” has not changed since the first publication; however, efforts to resolve the issues have progressed to varying degrees over the last year. This report provides a current status of efforts to eliminate or mitigate the issues, and includes new issues identified since the original analyses were conducted. Resolving these issues will increase the probability of successful waste and materials disposition and decrease the likelihood of delays due to inadequate transportation resources or infrastructure. The issues addressed in this report generally affect more than one site and more than one waste or material stream.
Date:
February 1, 2001
Creator:
Fawcett, Ricky Lee; Kramer, George Leroy Jr.; Fawcett, Ricky Lee; Moss, Ralph John; Fawcett, Ricky Lee & John, Mark Earl
Object Type:
Report
System:
The UNT Digital Library
2001 Spring Visitors' Guide (Port Aransas, Tex.)
Spring visitors' guide from Port Aransas, Texas that includes information of interest to visitors along with extensive advertising.
Date:
February 22, 2001
Creator:
Judson, Mary
Object Type:
Newspaper
System:
The Portal to Texas History
Abortion: Termination of Early Pregnancy with RU-486 (Mifepristone)
On September 28, 2000, the Food and Drug Administration (FDA) approved the drug mifepristone, also known as RU-486, for the termination of early pregnancy. Because RU-486 is an abortion agent, the process of moving it out of the lab and into mainstream medicine has been fraught with controversy. Since its discovery, the pro-life movement has been adamantly against the use of this drug for abortion. This report discusses the procedure of obtaining and using the drug, as well as the ongoing debate regarding its usage and related legislation.
Date:
February 23, 2001
Creator:
Johnson, Judith A.
Object Type:
Report
System:
The UNT Digital Library
ABSTRACTION OF DRIFT SEEPAGE
Drift seepage refers to flow of liquid water into repository emplacement drifts, where it can potentially contribute to degradation of the engineered systems and release and transport of radionuclides within the drifts. Because of these important effects, seepage into emplacement drifts is listed as a ''principal factor for the postclosure safety case'' in the screening criteria for grading of data in Attachment 1 of AP-3.15Q, Rev. 2, ''Managing Technical Product Inputs''. Abstraction refers to distillation of the essential components of a process model into a form suitable for use in total-system performance assessment (TSPA). Thus, the purpose of this analysis/model is to put the information generated by the seepage process modeling in a form appropriate for use in the TSPA for the Site Recommendation. This report also supports the Unsaturated-Zone Flow and Transport Process Model Report. The scope of the work is discussed below. This analysis/model is governed by the ''Technical Work Plan for Unsaturated Zone Flow and Transport Process Model Report'' (CRWMS M&O 2000a). Details of this activity are in Addendum A of the technical work plan. The original Work Direction and Planning Document is included as Attachment 7 of Addendum A. Note that the Work Direction and Planning …
Date:
February 8, 2001
Creator:
Wilson, Michael L.
Object Type:
Report
System:
The UNT Digital Library
AC Loss Measurements with a Cryocooled Sample
A new cryostat cooled by a closed-cycle Cryomech GB-37 cryocooler for superconductor measurements at temperatures down to 20 K is described. The sample is conductively coupled to the cold stage so as to minimize vibration and thermal stresses. AC losses have been measured calorimetrically in several HTSC coils that have been wound to simulate sub-scale transformer winding pairs. Stable temperatures down to 20 K were reached on these coils, allowing measurements at practical levels of ac current and I{sub c}. By using short ac current pulses, losses on individual turns could be resolved. Results are reported mainly to showcase the apparatus, measurement procedure and analytical approach.
Date:
February 15, 2001
Creator:
Schwenterly, S.W.
Object Type:
Article
System:
The UNT Digital Library
Achieving closure at Fernald
When Fluor Fernald took over the management of the Fernald Environmental Management Project in 1992, the estimated closure date of the site was more than 25 years into the future. Fluor Fernald, in conjunction with DOE-Fernald, introduced the Accelerated Cleanup Plan, which was designed to substantially shorten that schedule and save taxpayers more than $3 billion. The management of Fluor Fernald believes there are three fundamental concerns that must be addressed by any contractor hoping to achieve closure of a site within the DOE complex. They are relationship management, resource management and contract management. Relationship management refers to the interaction between the site and local residents, regulators, union leadership, the workforce at large, the media, and any other interested stakeholder groups. Resource management is of course related to the effective administration of the site knowledge base and the skills of the workforce, the attraction and retention of qualified a nd competent technical personnel, and the best recognition and use of appropriate new technologies. Perhaps most importantly, resource management must also include a plan for survival in a flat-funding environment. Lastly, creative and disciplined contract management will be essential to effecting the closure of any DOE site. Fluor Fernald, together with …
Date:
February 25, 2001
Creator:
Bradburne, John & Patton, Tisha C.
Object Type:
Article
System:
The UNT Digital Library
Acquisition and processing of multiparametric information from apixelmatrix
This paper addresses the design of a system intended to readout multiparametric information from a matrix of pixels. The system presented here acquires the charge associated with the signal and provides a timing information from each pixel. Although it lends itself to a broad range of time-correlated imaging situations involving any kind of pixel matrices, the design constraints assumed here are particularly tailored to the application with pixels that sense the output charge distribution from a Micro Channel Plate (MCP). The combination of a microchannel plate and a pixel matrix is an extremely versatile detector and the readout system must be able to fully exploit the intrinsically high position resolution and time accuracy featured by the MCP. The behavior of the readout system described in this paper is based upon advanced concepts to meet the above application requirements and is believed to provide a significant functional improvement over the conventional pixel systems.
Date:
February 1, 2001
Creator:
Manfredi, P.F.; Millaud, J.E. & Sushkov, V.V.
Object Type:
Article
System:
The UNT Digital Library
[Actors of the Ashe Caribbean Performing Arts Ensemble]
Photograph of a group of actors, seen performing the award winning musical "Lift Up Jamaica." The actors are part of the Ashe Caribbean Performing Arts Ensemble with Michael Holgate (center front) as one of the leading characters of the musical. The musical event was held in sponsorship by The Black Academy of Arts and Letters in Dallas, Texas and was performed at the Dallas Convention Center Complex in the Naomi Burton Theatre on 650 S. Griffin St., Saturday, February 24th 2001.
Date:
February 24, 2001
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
Adaptive path planning algorithm for cooperating unmanned air vehicles
An adaptive path planning algorithm is presented for cooperating Unmanned Air Vehicles (UAVs) that are used to deploy and operate land-based sensor networks. The algorithm employs a global cost function to generate paths for the UAVs, and adapts the paths to exceptions that might occur. Examples are provided of the paths and adaptation.
Date:
February 8, 2001
Creator:
Cunningham, C T & Roberts, R S
Object Type:
Article
System:
The UNT Digital Library
Addressing Environmental Externalities from Electricity Generation in South Carolina
This paper gives estimates of the externalities associated with the increased likelihood of health and environmental impacts that result from exposure to pollutants emitted by electric power plants in South Carolina. A new method for estimating externalities is developed, results are presented, and policy-related implications are discussed. The results suggest that the environmental externalities are noteworthy and would affect electricity consumption if they are internalized and passed on to consumers in the rates they are charged. Yet, if the externalities are internalized, they are not so great that they would dramatically alter the fuel mix in the state in the immediate future. Two policy options are discussed: incentives or disincentives for new merchant power plants and emissions permit trading.
Date:
February 23, 2001
Creator:
Lee, RM
Object Type:
Article
System:
The UNT Digital Library
ADVANCED EMISSIONS CONTROL DEVELOPMENT PROGRAM
The primary objective of the Advanced Emissions Control Development Program (AECDP) is to develop practical, cost-effective strategies for reducing the emissions of hazardous air pollutants (HAPs, or air toxics) from coal-fired boilers. The project goal is to effectively control air toxic emissions through the use of conventional flue gas cleanup equipment such as electrostatic precipitators (ESPs), fabric filters (baghouses), and wet flue gas desulfurization (WFGD) systems. Development work initially concentrated on the capture of trace metals, fine particulate, hydrogen chloride, and hydrogen fluoride. Recent work has focused almost exclusively on the control of mercury emissions.
Date:
February 6, 2001
Creator:
Farthing, G.A.
Object Type:
Report
System:
The UNT Digital Library
Advanced Wavefront Control Techniques
Programs at LLNL that involve large laser systems--ranging from the National Ignition Facility to new tactical laser weapons--depend on the maintenance of laser beam quality through precise control of the optical wavefront. This can be accomplished using adaptive optics, which compensate for time-varying aberrations that are often caused by heating in a high-power laser system. Over the past two decades, LLNL has developed a broad capability in adaptive optics technology for both laser beam control and high-resolution imaging. This adaptive optics capability has been based on thin deformable glass mirrors with individual ceramic actuators bonded to the back. In the case of high-power lasers, these adaptive optics systems have successfully improved beam quality. However, as we continue to extend our applications requirements, the existing technology base for wavefront control cannot satisfy them. To address this issue, this project studied improved modeling tools to increase our detailed understanding of the performance of these systems, and evaluated novel approaches to low-order wavefront control that offer the possibility of reduced cost and complexity. We also investigated improved beam control technology for high-resolution wavefront control. Many high-power laser systems suffer from high-spatial-frequency aberrations that require control of hundreds or thousands of phase points to …
Date:
February 21, 2001
Creator:
Olivier, S. S.; Brase, J. M.; Avicola, K.; Thompson, C. A.; Kartz, M. W.; Winters, S. et al.
Object Type:
Report
System:
The UNT Digital Library
AFREET: HUMAN-INSPIRED SPATIO-SPECTRAL FEATURE CONSTRUCTION FOR IMAGE CLASSIFICATION WITH SUPPORT VECTOR MACHINES
The authors examine the task of pixel-by-pixel classification of the multispectral and grayscale images typically found in remote-sensing and medical applications. Simple machine learning techniques have long been applied to remote-sensed image classification, but almost always using purely spectral information about each pixel. Humans can often outperform these systems, and make extensive use of spatial context to make classification decisions. They present AFREET: an SVM-based learning system which attempts to automatically construct and refine spatio-spectral features in a somewhat human-inspired fashion. Comparisons with traditionally used machine learning techniques show that AFREET achieves significantly higher performance. The use of spatial context is particularly useful for medical imagery, where multispectral images are still rare.
Date:
February 1, 2001
Creator:
PERKINS, S. & HARVEY, N.
Object Type:
Article
System:
The UNT Digital Library
The Age, Volume 24, Number 2, February 2001
Monthly publication containing information related to Chambers County, Texas, including current events of the Chambers County Historical Commission, the Wallisville Heritage Park, and the Chambers County historical and genealogical societies; reprinted newspaper articles about county events and citizens; and historical news and records.
Date:
February 2001
Creator:
Wallisville Heritage Park (Organization)
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Aging of Polyurethane Foam Insulation in Simulated Refrigerator Panels--Two-Year Results with Third-Generation Blowing Agents
Laboratory data are presented on the effect of constant-temperature aging on the apparent thermal conductivity of polyurethane foam insulation for refrigerators and freezers. The foam specimens were blown with HCFC-141b and with three of its potential replacements--HFC-134a, HFC-245fa, and cyclopentane. Specimens were aged at constant temperatures of 90 F, 40 F, and {minus}10 F. Thermal conductivity measurements were made on two types of specimens: full-thickness simulated refrigerator panels containing foam enclosed between solid plastic sheets, and thin slices of core foam cut from similar panels. Results are presented for the first two years of a multi-year aging study. Preliminary comparisons of measured data with predictions of a mathematical aging model are presented.
Date:
February 14, 2001
Creator:
Wilkes, K. E.
Object Type:
Article
System:
The UNT Digital Library
Agriculture: A List of Websites
This list provides a sampling of the rapidly proliferating number of agricultural resources available on the Internet. It is not intended to be exhaustive. It is divided into 24 main categories and 15 subcategories.
Date:
February 8, 2001
Creator:
Canada, Carol
Object Type:
Report
System:
The UNT Digital Library
Air Monitoring Technician Working for an O&M Contractor
Periodic bulletin issued by the Texas Department of Health providing information and guidance regarding regulations around the use and abatement of asbestos. This issue clarifies confusion on whether or not a Air Monitoring Technician can be employed to take personal air samples for evaluation potential worker exposures.
Date:
February 2001
Creator:
Texas. Department of Health. Toxic Substances Control Division.
Object Type:
Pamphlet
System:
The Portal to Texas History
Airborne Electronic Warfare: Issues for the 107th Congress
This report discusses electronic warfare (EW) as an effective technique for increasing aircraft and aircrew survivability in hostile environments, which in turn improves the overall effectiveness of the air campaign.
Date:
February 9, 2001
Creator:
Bolkcom, Christopher
Object Type:
Report
System:
The UNT Digital Library