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19,998 Matching Results
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A Sealed-Accelerator-Tube Neutron Generator for Boron Neutron Capture Therapy Application
Radio-frequency (RF) driven ion sources are being developed in Lawrence Berkeley National Laboratory (LBNL) for sealed-accelerator-tube neutron generator applications. By using a 2.5-cm-diameter RF-driven multicusp source and a computer designed 100 keV accelerator column, peak extractable hydrogen current exceeding 1 A from a 3-mm-diameter aperture, together with H{sup +} yields over 94% have been achieved. These experimental findings together with recent moderator design will enable one to develop compact 14 MeV neutron generators based on the D-T fusion reaction. In this new neutron generator, the ion source, the accelerator and the target are all housed in a sealed metal container without pumping. With a 120 keV and 1 A deuteron beam, it is estimated that a treatment time of {approx} 45 minutes is needed for boron neutron capture therapy.
Date:
June 1, 1998
Creator:
Leung, K. N.; Leung, K. N.; Lee, Y.; Verbeke, J. M.; Vurjic, J.; Williams, M. D. et al.
Object Type:
Article
System:
The UNT Digital Library
Seepage into drifts in unsaturated fractured rock at YuccaMountain
None
Date:
August 17, 1998
Creator:
Birkholzer, Jens; Li, Guomin; Tsang, Chin-Fu & Tsang, Yvonne
Object Type:
Article
System:
The UNT Digital Library
Conformal Field Theories: From Old to New
In a short review of recent work, we discuss the general problem of constructing the actions of new conformal field theories from old conformal field theories. Such a construction follows when the old conformal field theory admits new conformal stress tensors in its chiral algebra, and it turns out that the new conformal field theory is generically a new spin-two gauge theory. As an example we discuss the new spin-two gauged sigma models which arise in this fashion from the general conformal non-linear sigma model.
Date:
February 11, 1998
Creator:
Halpern, M. B. & Schwartz, C.
Object Type:
Article
System:
The UNT Digital Library
[News Clip: Seat Belts]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story. This story aired at 6pm.
Date:
December 16, 1998, 6:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
Monitoring and Evaluation of Smolt Migration in the Columbia River Basin : Volume V : Evaluation of the 1999 Predictions of the Run-Timing of Wild Migrant Yearling and Subyearling Chinook Salmon and Steelhead Trout, and Hatchery Sockeye Salmon in the Snake River Basin using Program RealTime.
Program RealTime provided tracking and forecasting of the 1999 inseason outmigration via the internet for stocks of wild PIT-tagged spring/summer chinook salmon. These stocks were ESUs from sixteen release sites above Lower Granite dam, including Bear Valley Creek, Big Creek, Cape Horn Creek, Catherine Creek, Elk Creek, Herd Creek, Imnaha River, Lake Creek, Loon Creek, Lostine River, Marsh Creek, Minam River, South Fork Salmon River, and Secesh River, Sulfur Creek and Valley Creek. Forecasts were also provided for a stock of hatchery-reared PIT-tagged summer-run sockeye salmon from Redfish Lake and for the runs-at-large of Snake River wild yearling chinook salmon, and steelhead trout. The 1999 RealTime project began making forecasts for a new stock of PIT-tagged wild fall subyearling chinook salmon, as a substitute for forecasts of the wild run-at-large, discontinued June 6. Forecasts for the run-at-large were discontinued when a large release of unmarked hatchery fish into the Snake River made identification of wild fish impossible. The 1999 Program RealTime performance was comparable to its performance in previous years with respect to the run-at-large of yearling chinook salmon (whole season MAD=3.7%), and the run of hatchery-reared Redfish Lake sockeye salmon (whole season MAD=6.7%). Season-wide performance of program RealTime predictions …
Date:
July 1, 1998
Creator:
Burgess, Caitlin
Object Type:
Report
System:
The UNT Digital Library
Monitoring and Evaluation of Smolt Migration in the Columbia River Basin : Volume III : Evaluation of the 1997 Predictions of the Run-Timing of Wild Migrant Yearling and Subyearling Chinook and Sockeye in the Snake River Basin Using Program RealTime.
Since the 1994 outmigration, program RealTime has been applied to provide in-season predictions of smolt outmigration timing for individual and aggregates of listed threatened and endangered Snake River salmon stocks. Results from the 1997 smolt outmigrations of wild Snake River yearling and subyearling chinook show prediction of run-timing can be accurately forecasted. The number of release sites meeting previous years criteria for RealTime forecasts dropped to five for the wild spring/summer chinook parr PIT-tagged in 1996: Catherine Creek, Imnaha, Lostine, Minam and South Fork Salmon Rivers. An experiment in lessening previous RealTime requirements for forecasting a outmigration in progress added three release sites of chinook: Lake Creek, Secesh and South Fork Wenaha Rivers; and one release of age 1+ sockeye at Redfish Lake. Passage indices provided by the Fish Passage Center for Lower Granite Dam were monitored for the wild subyearling chinook outmigration. Investigation continued into basing predictions on historical years with similar flows as a way to improve forecasting performance for the wild subyearling outmigration. Program RealTime's output is a series of estimated percentages of the status of the smolt outmigration throughout the season. To compare the performance the program from year to year, or to compare various assumptions …
Date:
July 1, 1998
Creator:
Townsend, Richard L.
Object Type:
Report
System:
The UNT Digital Library
Investigation of 2H(d,n)3He and 3H(d,n)4He Fusion Reactions asAlternative Neutron Sources for BNCT
None
Date:
June 1, 1998
Creator:
Verbeke, J. M.; Vujic, J. & Leung, K. N.
Object Type:
Article
System:
The UNT Digital Library
Numerical experiments on the probability of seepage intounderground openings in heterogeneous fractured rock
An important issue for the performance of underground nuclear waste repositories is the rate of seepage into the waste emplacement drifts. A prediction of this rate is particularly complicated for the potential repository site at Yucca Mountain, Nevada, because it is located in thick, unsaturated, fractured tuff formations. Underground opening in unsaturated media might act as capillary barriers, diverting water around them. In the present work, they study the potential rate of seepage into drifts as a function of the percolation flux at Yucca Mountain, based on a stochastic model of the fractured rock mass in the drift vicinity. A variety of flow scenarios are considered, assuming present-day and possible future climate conditions. They show that the heterogeneity in the flow domain is a key factor controlling seepage rates, since it causes channelized flow and local ponding in the unsaturated flow field.
Date:
April 15, 1998
Creator:
Birkholzer, J.; Li, G.; Tsang, C. F. & Tsang, Y.
Object Type:
Report
System:
The UNT Digital Library
Development and Testing of Industrial Scale Coal Fired Combustion System, Phase 3
Coal Tech Corp's mission is to develop, license & sell innovative, lowest cost, solid fuel fired power systems & total emission control processes using proprietary and patented technology for domestic and international markets. The present project 'DEVELOPMENT & TESTING OF INDUSTRIAL SCALE, COAL FIRED COMBUSTION SYSTEM, PHASE 3' on DOE Contract DE-AC22-91PC91162 was a key element in achieving this objective. The project consisted of five tasks that were divided into three phases. The first phase, 'Optimization of First Generation 20 MMBtu/hr Air-Cooled Slagging Coal Tech Combustor', consisted of three tasks, which are detailed in Appendix 'A' of this report. They were implemented in 1992 and 1993 at the first generation, 20 MMBtu/hour, combustor-boiler test site in Williamsport, PA. It consisted of substantial combustor modifications and coal-fired tests designed to improve the combustor's wall cooling, slag and ash management, automating of its operation, and correcting severe deficiencies in the coal feeding to the combustor. The need for these changes was indicated during the prior 900-hour test effort on this combustor that was conducted as part of the DOE Clean Coal Program. A combination of combustor changes, auxiliary equipment changes, sophisticated multi-dimensional combustion analysis, computer controlled automation, and series of single and …
Date:
September 30, 1998
Creator:
Zauderer, Bert
Object Type:
Report
System:
The UNT Digital Library
A Review of Hidalgo County's Enforcement of Model Subdivision Rules - Phase II
Report of the Texas State Auditor's Office related to developing an accurate population of subdivisions approved by Hidalgo County from 1991 to 1994; drawing a statistically valid sample of subdivisions composed of four or more residential lots not located within any city limit from this population; determining an accurate number of exceptions within the sample; and projecting a reliable rate of exception for the entire 1991 to 1994 population.
Date:
November 1998
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History
An Audit Report on Performance Measures at 36 State Entities, Phase 12 of the Performance Measures Reviews
Report of the Texas State Auditor's Office related to determining whether selected state entities are accurately reporting their key performance measures to the Automated Budget and Evaluation System of Texas (ABEST) database, whether the state entities have adequate control systems in place over the collection and reporting of their performance measures, and providing assistance to selected state entities who were undergoing self-examinations or that have had recurring problems in controlling and reporting performance measure data.
Date:
May 1998
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History
An Audit of Management Controls at the Texas Workers' Compensation Commission
Report of the Texas State Auditor's Office related to management controls at the Texas Workers' Compensation Commission (Commission). The report evaluates the existing management control systems at the Commission, which enable the Commission to accomplish its mission, goals, and strategies, and also provides suggestions for improvements to existing practices and systems.
Date:
February 1998
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History
A Briefing Report on School District Debt Program
Report of the Texas State Auditor's Office related to analyzing the increase in new debt in school districts; determining types of alternative debt, implications for future school district solvency, and the amount of debt associated with each type; and reviewing the roles of the Texas Education Agency, the Attorney General's Office, and the Texas Bond Review Board to determine the extent of oversight and to identify gaps in oversight responsibilities.
Date:
February 1998
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History
An Audit Report on Inventory Management at the Texas Department of Transportation
Report of the Texas State Auditor's Office related to determining if management controls for the selected segments of the Texas Department of Transportation's (Department) inventories and fixed assets were adequate and if related performance goals were routinely and accurately measured.
Date:
November 1998
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History
An Audit at the Office of the Fire Fighters' Pension Commissioner - FY 1997 Financial Statements and Management Control Follow-Up
Report of the Texas State Auditor's Office related to the financial statements of the Office of the Fire Fighters' Pension Commissioner (Commission). The report discusses the changes that the Commission has implemented to reduce investment operations risk, and the reportable conditions related to internal controls that, if not corrected, could adversely affect the Commission's ability record, process, summarize, and report its financial data accurately.
Date:
November 1998
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History
A Letter Report on Management Controls at Tarleton State University
Report of the Texas State Auditor's Office related to business systems in place at Tarleton State University to ensure resources are spent appropriately, and minor issues in information management, service department operations, and the Office of Human Resources which were identified during the audit.
Date:
July 1998
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History
An Audit Report on The Implementation of House Bill 2377 and the Conversion of State-Operated Community Services to Local Control
Report of the Texas State Auditor's Office related to evaluating plans for the House Bill 2377 pilot project, reviewing selected management controls at the community centers participating in the pilot, and evaluating the plans to convert the state-operated services to local control.
Date:
January 1998
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History
A Review of Southwest Texas State University, Texas A&M University-Commerce and Texas A&M University- Glaveston
Report of the Texas State Auditor's Office related to enhancements of control systems and overall operations made at Southwest Texas State University, Texas A&M University - Commerce, and Texas A&M University - Galveston.
Date:
June 1998
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History
A Report on the Certification of the Permanent School Fund Bond Guarantee Program
Report of the Texas State Auditor's Office related to the Permanent School Fund Bond Guarantee Program in compliance with Section 45.053(a) of the Texas Education Code.
Date:
July 1998
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History
A Report on the Management Controls at Angelo State University
Report of the Texas State Auditor's Office related to evaluating the existing management control systems within Angelo State University to identify strengths and weaknesses.
Date:
June 1998
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History
An Audit Report on Managed Health Care at The Texas Department of Criminal Justice
Report of the Texas State Auditor's Office related to the implementation of a managed health care system by the Texas Department of Criminal Justice in order to control increasing costs of providing health care to inmates, and opportunities for improvement of the management controls in the prison health care system.
Date:
January 1998
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History
A Follow-Up Audit Report on Management Controls at the Texas Natural Resource Conservation Commission
Report of the Texas State Auditor's Office related to determining whether the Texas Natural Resource Conservation Commission (Commission) has implemented the significant recommendations from three previous audit reports.
Date:
December 1998
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History
A Report on the 1997 Financial and Compliance Audit Results(Statewide)
Report of the Texas State Auditor's Office related to determining whether the financial statements of the State present fairly the financial position, results of operations, and cash flows in accordance with generally accepted accounting principles; fulfilling audit requirements of the Single Audit Act (Federal Compliance); determining compliance with significant bond covenants; and issuing individual management letters on reportable conditions.
Date:
June 1998
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History
An Audit Report on Selected Management Controls at Certified Non-Profit Health Corporations
Report of the Texas State Auditor's Office related to determining if selected certified non-profit health corporations associated with Texas medical institutions have effective controls over key operations to minimize risks associated with its operations.
Date:
December 1998
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History