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68
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8
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2
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4,170 Matching Results
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APPLICATION OF A THIN FILM EVAPORATOR SYSTEM FOR MANAGEMENT OF LIQUID HIGH-LEVEL WASTES AT HANFORD
A modular, transportable evaporator system, using thin film evaporative technology, is planned for deployment at the Hanford radioactive waste storage tank complex. This technology, herein referred to as a wiped film evaporator (WFE), will be located at grade level above an underground storage tank to receive pumped liquids, concentrate the liquid stream from 1.1 specific gravity to approximately 1.4 and then return the concentrated solution back into the tank. Water is removed by evaporation at an internal heated drum surface exposed to high vacuum. The condensed water stream will be shipped to the site effluent treatment facility for final disposal. This operation provides significant risk mitigation to failure of the aging 242-A Evaporator facility; the only operating evaporative system at Hanford maximizing waste storage. This technology is being implemented through a development and deployment project by the tank farm operating contractor, Washington River Protection Solutions (WRPS), for the Office of River Protection/Department of Energy (ORP/DOE), through Columbia Energy & Environmental Services, Inc. (Columbia Energy). The project will finalize technology maturity and install a system at one of the double-shell tank farms. This paper discusses results of pre-project pilot-scale testing by Columbia Energy and ongoing technology maturation development scope through fiscal …
Date:
January 14, 2010
Creator:
Tedeschi, A. R. & Wilson, R. A.
Object Type:
Article
System:
The UNT Digital Library
Approximation Properties of Coarse Spaces by Algebraic Multigrid
None
Date:
January 14, 2010
Creator:
Vassilevski, P. S.
Object Type:
Article
System:
The UNT Digital Library
Briefing on Commercial and Department of Defense Space System Requirements and Acquisition Practices
Correspondence issued by the Government Accountability Office with an abstract that begins "The Department of Defense (DOD) has had long-standing difficulties developing and delivering space systems on time and within budget. Some programs have been delayed by years and cost billions of dollars more than their initial estimates. Attempts to reform DOD space acquisitions in the past have sought to leverage commercial approaches or rely more on the commercial sector to meet DOD needs. These efforts have not been successful and, in some cases, have exacerbated problems, particularly with respect to oversight. In view of past challenges with adopting commercial approaches, Congress requested an examination of the following questions: (1) What are the differences between commercial and national security space system missions, requirements, and technology development? (2) What acquisition practices adopted by commercial companies could be used for national security space system acquisitions? (3) Which acquisition practices adopted by commercial companies may not be readily adaptable for national security space system acquisitions?"
Date:
January 14, 2010
Creator:
United States. Government Accountability Office.
Object Type:
Text
System:
The UNT Digital Library
COG - Special Features of Interest to Criticality Safety Practitioners
COG is a modern, general-purpose, high fidelity, multi-particle transport code developed at the Lawrence Livermore National Laboratory specifically for use in deep penetration (shielding) and criticality safety calculations. This paper describes some features in COG of special interest to criticality safety practitioners.
Date:
January 14, 2010
Creator:
Buck, R M; Heinrichs, D P; Krass, A W & Lent, E M
Object Type:
Article
System:
The UNT Digital Library
A Concept for a Low Pressure Noble Gas Fill Intervention in the IFE Fusion Test Facility (FTF) Target Chamber
An engineering evaluation has been initiated to investigate conceptual engineering methods for implementing a viable gas shield strategy in the Fusion Test Facility (FTF) target chamber. The employment of a low pressure noble gas in the target chamber to thermalize energetic helium ions prior to interaction with the wall could dramatically increase the useful life of the first wall in the FTF reactor1. For the purpose of providing flexibility, two target chamber configurations are addressed: a five meter radius sphere and a ten meter radius sphere. Experimental studies at Nike have indicated that a low pressure, ambient gas resident in the target chamber during laser pulsing does not appear to impair the ability of laser light from illuminating targets2. In addition, current investigations into delivering, maintaining, and processing low pressure gas appear to be viable with slight modification to current pumping and plasma exhaust processing technologies3,4. Employment of a gas fill solution for protecting the dry wall target chamber in the FTF may reduce, or possibly eliminate the need for other attenuating technologies designed for keeping He ions from implanting in first wall structures and components. The gas fill concept appears to provide an effective means of extending the life …
Date:
January 14, 2010
Creator:
C.A. Gentile, W.R. Blanchard, T.A. Kozub, M. Aristova, C. McGahan, S. Natta, K. Pagdon, J. Zelenty
Object Type:
Report
System:
The UNT Digital Library
CRS Issue Statement on Civil Rights and Discrimination
This report discusses about civil right statues as well as several constitutional provisions. It also points out about different types of discrimination.
Date:
January 14, 2010
Creator:
Feder, Jody
Object Type:
Report
System:
The UNT Digital Library
CRS Issue Statement on Health Care Reform
Interests in health care reform are driven by growing concern about several widely discussed problems, most especially health insurance coverage, health care costs, and patients' access to quality care.
Date:
January 14, 2010
Creator:
Peterson, Chris L.
Object Type:
Report
System:
The UNT Digital Library
CRS Issue Statement on Housing for LowIncome Individuals and Families
This report contains a Congressional Service Report (CRS) Issue statements on housing for low income individuals and families.
Date:
January 14, 2010
Creator:
McCarty, Maggie; Perl, Libby; Foote, Bruce E.; Jones, Katie; Carpenter, David H.; Garvey, Todd et al.
Object Type:
Report
System:
The UNT Digital Library
Department of Energy: Actions Needed to Develop High-Quality Cost Estimates for Construction and Environmental Cleanup Projects
A letter report issued by the Government Accountability Office with an abstract that begins "The Department of Energy (DOE) spends billions of dollars on construction projects--those that maintain nuclear weapons, conduct research, and process nuclear waste--and projects that clean up nuclear and hazardous wastes at DOE's sites; these projects are largely executed by contractors. DOE has struggled to keep these projects within cost and schedule estimates. GAO was asked to assess (1) DOE's cost-estimating policies and guidance, (2) the extent to which selected projects' cost estimates reflect best practices compiled in GAO's cost-estimating guide, and (3) DOE's recent actions to improve cost estimating. GAO reviewed relevant documents, including support for cost estimates at three major construction projects--those costing $750 million or more--and one environmental cleanup project, and interviewed DOE officials."
Date:
January 14, 2010
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
DEPLOYING TECHNOLOGY ADVANCEMENTS FOR CHARACTERIZING THE VADOSE ZONE IN SINGLE-SHELL TANK WASTE MANAGEMENT AREAS
As much as one million gallons of waste is believed to have leaked from tanks, pipelines or other equipment in the single-shell tank farm waste management areas (WMAs) within the 200 East and West areas of the U.S. Department of Energy's Hanford Site near Richland, Washington. Although some contamination has reached groundwater, most contamination still resides in the vadose zone. The magnitude ofthis problem requires new approaches for soil characterization if we are to understand the nature and extent of the contamination and take action to protect the enviromnent. Because of the complexity and expense of drilling traditional boreholes in contaminated soil, direct push characterization using a hydraulic hammer has been extensively employed. Direct push probe holes <3-inch diameter have been pushed to a maximum depth of 240 feet below ground surface in 200 East area. Previously gross gamma and moisture logging of these narrow probe holes was perfonned to identify the location of cesium-137 ({sup 137}Cs) (which has limited mobility in Hanford soil) and moisture peaks. Recently a bismuth germinate detector has been deployed for detecting and quantifying the spectrum of cobalt-60 ({sup 60}Co) (a more mobile contaminant), which provides additional information. The direct push system is configured to …
Date:
January 14, 2010
Creator:
SJ, EBERLEIN; HA, SYDNOR & MYERS, DA
Object Type:
Article
System:
The UNT Digital Library
The Design and Implementation of Patent Revocation Proceedings: Innovation Issues
This report contains an overview of the innovation issues of the design and implementation of patent revocation proceedings.
Date:
January 14, 2010
Creator:
Thomas, John R.
Object Type:
Report
System:
The UNT Digital Library
Disaster Assistance: Federal Assistance for Permanent Housing Primarily Benefited Homeowners; Opportunities Exist to Better Target Rental Housing Needs
A letter report issued by the Government Accountability Office with an abstract that begins "In response to the 2005 Gulf Coast hurricanes, Congress provided about $130 billion in disaster recovery assistance, including assistance for permanent housing. Congress has expressed an interest in how this assistance has been allocated to homeowners and rental property owners, particularly for state-administered programs. GAO's objectives were to review (1) how federal disaster-related assistance for permanent housing has been provided to homeowners and rental property owners, (2) the extent to which federally funded programs have responded to the needs of homeowners and rental property owners, and (3) the challenges that homeowners and rental property owners have faced in applying for and using federal assistance, and potential options for addressing these challenges. To address these objectives, GAO analyzed documentation for key programs and program data, and interviewed federal, state, and local officials regarding the challenges associated with these programs."
Date:
January 14, 2010
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
Earthquakes: Risk, Detection, Warning, and Research
This report discusses earthquake hazards and risk in the United States, federal programs that support earthquake monitoring, the U.S. capability to detect earthquakes and issue notifications and warnings, and federally-supported research to improve the fundamental scientific understanding of earthquakes with a goal of reducing U.S. vulnerability.
Date:
January 14, 2010
Creator:
Folger, Peter
Object Type:
Report
System:
The UNT Digital Library
Exiting TARP and Unwinding Its Impact on the Financial Markets
January report of the U.S. Congressional Oversight Panel describing their activities and findings regarding the winding down of the Troubled Asset Relief Program (TARP) and its impact on financial markets.
Date:
January 14, 2010
Creator:
United States. Congressional Oversight Panel.
Object Type:
Report
System:
The UNT Digital Library
Federal Register, Volume 75, Number 9, January 14, 2010, Pages 2053-2432
Daily publication of the U.S. Office of the Federal Register contains rules and regulations, proposed legislation and rule changes, and other notices, including "Presidential proclamations and Executive Orders, Federal agency documents having general applicability and legal effect, documents required to be published by act of Congress, and other Federal agency documents of public interest" (p. ii). Table of Contents starts on page iii.
Date:
January 14, 2010
Creator:
United States. Office of the Federal Register.
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
The Future of NASA: Space Policy Issues Facing Congress
This report analyzes questions regarding space policy challenges and gives some possible answers. It also addresses a number of cross-cutting issues, such as NASA's (the National Aeronautics and Space Agency's) interactions with other federal agencies and the growing role of the commercial space industry.
Date:
January 14, 2010
Creator:
Morgan, Daniel
Object Type:
Report
System:
The UNT Digital Library
Health Insurance Coverage of People Aged 55 to 64: Implications for a Medicare Buy-In
This report shows that the near elderly are significantly more likely than other nonaged adults to be in fair or poor health, and to have had a heart attack or stroke.
Date:
January 14, 2010
Creator:
Peterson, Chris L. & Newsom, Mark
Object Type:
Report
System:
The UNT Digital Library
HIGH-LEVEL WASTE FEED CERTIFICATION IN HANFORD DOUBLE-SHELL TANKS
The ability to effectively mix, sample, certify, and deliver consistent batches of High Level Waste (HLW) feed from the Hanford Double Shell Tanks (DST) to the Waste Treatment and Immobilization Plant (WTP) presents a significant mission risk with potential to impact mission length and the quantity of HLW glass produced. DOE's River Protection Project (RPP) mission modeling and WTP facility modeling assume that individual 3785 cubic meter (l million gallon) HLW feed tanks are homogenously mixed, representatively sampled, and consistently delivered to the WTP. It has been demonstrated that homogenous mixing ofHLW sludge in Hanford DSTs is not likely achievable with the baseline design thereby causing representative sampling and consistent feed delivery to be more difficult. Inconsistent feed to the WTP could cause additional batch-to-batch operational adjustments that reduce operating efficiency and have the potential to increase the overall mission length. The Hanford mixing and sampling demonstration program will identify DST mixing performance capability, will evaluate representative sampling techniques, and will estimate feed batch consistency. An evaluation of demonstration program results will identify potential mission improvement considerations that will help ensure successful mission completion. This paper will discuss the history, progress, and future activities that will define and mitigate the …
Date:
January 14, 2010
Creator:
MG, THIEN; BE, WELLS & DJ, ADAMSON
Object Type:
Article
System:
The UNT Digital Library
Implications of NSTX Lithium Results for Magnetic Fusion Research
Lithium wall coating techniques have been experimentally explored on NSTX for the last five years. The lithium experimentation on NSTX started with a few milligrams of lithium injected into the plasma as pellets and it has evolved to a lithium evaporation system which can evaporate up to ~ 100 g of lithium onto the lower divertor plates between lithium reloadings. The unique feature of the lithium research program on NSTX is that it can investigate the effects of lithium in H-mode divertor plasmas. This lithium evaporation system thus far has produced many intriguing and potentially important results; the latest of these are summarized in a companion paper by H. Kugel. In this paper, we suggest possible implications and applications of the NSTX lithium results on the magnetic fusion research which include electron and global energy confinement improvements, MHD stability enhancement at high beta, ELM control, H-mode power threshold reduction, improvements in radio frequency heating and non-inductive plasma start-up performance, innovative divertor solutions and improved operational efficiency.
Date:
January 14, 2010
Creator:
M. Ono, M.G. Bell, R.E. Bell, R. Kaita, H.W. Kugel, B.P. LeBlanc, J.M. Canik, S. Diem, S.P.. Gerhardt, J. Hosea, S. Kaye, D. Mansfield, R. Maingi, J. Menard, S. F. Paul, R. Raman, S.A. Sabbagh, C.H. Skinner, V. Soukhanovskii, G. Taylor, and the NSTX Research Team
Object Type:
Report
System:
The UNT Digital Library
Interferometric adaptive optics for the National Ignition Facility
None
Date:
January 14, 2010
Creator:
Baker, K.; Homoelle, D.; Stappaerts, E.; Siders, C. & Barty, C.
Object Type:
Article
System:
The UNT Digital Library
Job Creation Programs of the Great Depression: the WPA and the CCC
This report first describes the social policy environment in which the 1930s job creation programs were developed and examines the reasons for their shortcomings then and as models for current-day countercyclical employment measures. It then provides a brief overview of the two job creation programs of the Depression-era that Members of Congress have asked about most frequently: the Works Progress or Projects Administration (WPA) and the Civilian Conservation Corps (CCC).
Date:
January 14, 2010
Creator:
Levine, Linda
Object Type:
Report
System:
The UNT Digital Library
Massively Multi-core Acceleration of a Document-Similarity Classifier to Detect Web Attacks
This paper describes our approach to adapting a text document similarity classifier based on the Term Frequency Inverse Document Frequency (TFIDF) metric to two massively multi-core hardware platforms. The TFIDF classifier is used to detect web attacks in HTTP data. In our parallel hardware approaches, we design streaming, real time classifiers by simplifying the sequential algorithm and manipulating the classifier's model to allow decision information to be represented compactly. Parallel implementations on the Tilera 64-core System on Chip and the Xilinx Virtex 5-LX FPGA are presented. For the Tilera, we employ a reduced state machine to recognize dictionary terms without requiring explicit tokenization, and achieve throughput of 37MB/s at slightly reduced accuracy. For the FPGA, we have developed a set of software tools to help automate the process of converting training data to synthesizable hardware and to provide a means of trading off between accuracy and resource utilization. The Xilinx Virtex 5-LX implementation requires 0.2% of the memory used by the original algorithm. At 166MB/s (80X the software) the hardware implementation is able to achieve Gigabit network throughput at the same accuracy as the original algorithm.
Date:
January 14, 2010
Creator:
Ulmer, C.; Gokhale, M.; Top, P.; Gallagher, B. & Eliassi-Rad, T.
Object Type:
Article
System:
The UNT Digital Library
Nonstrategic Nuclear Weapons
This report provides basic information about U.S. and Russian nonstrategic nuclear weapons. It begins with a brief discussion of the differences between strategic and nonstrategic nuclear weapons. It then provides some historical background, describing the numbers and types of nonstrategic nuclear weapons deployed by both nations during the Cold War and in the past decade; the policies that guided the deployment and prospective use of these weapons; and the measures that the two sides have taken to reduce, eliminate, and, more recently, augment their forces.
Date:
January 14, 2010
Creator:
Woolf, Amy F.
Object Type:
Report
System:
The UNT Digital Library
Performace of Multi-Probe Corrosion Monitoring Systems at the Hanford Site
Between 2007 and 2009, several different multi-probe corrosion monitoring systems were designed and installed in high-level nuclear waste tanks at the U.S. Department of Energy's Hanford Site in WaShington State. The probe systems are being monitored to ensure waste tanks operate in regions that minimize localized corrosion (i.e., pitting) and stress corrosion cracking. The corrosion monitoring systems have been installed in wastes with different chemistry types. An ongoing effort during the same time period has generated non-radioactive simulants that are tested in the laboratory to establish baseline corrosion monitoring system performance and characterize data to allow interpretation of readings from the multiple corrosion monitoring systems. Data collection from these monitoring systems has reached the point where the results allow comparison with the laboratory testing. This paper presents analytical results from the corrosion monitoring system development program.
Date:
January 14, 2010
Creator:
Carothers, K. D.; Boomer, K. D.; Anda, V. S.; Dahl, M. M. & Edgemon, G. L.
Object Type:
Article
System:
The UNT Digital Library