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147,374 Matching Results
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PV Reflectometer: A Process Monitoring Tool for Solar Cell Manufacturing
A new instrument is described for in-line monitoring of various process steps in silicon solar-cell fabrication.
Date:
January 1, 2000
Creator:
Sopori, B.; Chen, W. & Zhang, Y.
Object Type:
Article
System:
The UNT Digital Library
QCD Rescattering and High Energy Two-Body Photodisintegration of the Deuteron
Photon absorption by a quark in one nucleon followed by its high-momentum transfer interaction with a quark in the other may produce two final-state nucleons with high relative momentum. We sum the relevant quark rescattering diagrams to show that the scattering amplitude depends on a convolution between the large angle p n scattering amplitude, the hard photon-quark interaction vertex, and the low-momentum deuteron wave function. The computed absolute values of the cross section are in reasonable agreement with the data.
Date:
January 1, 2000
Creator:
Frankfurt, Leonid L.; Miller, Gerald A.; Sargsian, Misak M. & Strikman, Mark I.
Object Type:
Article
System:
The UNT Digital Library
QUANTUM CRYPTOGRAPHY FOR SECURE SATELLITE COMMUNICATIONS
None
Date:
January 1, 2000
Creator:
Hughes, Richard J.; Buttler, William T.; Kwiat, Paul G.; Lamoreaux, Steve K.; Morgan, George L.; Nordholt, Jane E. et al.
Object Type:
Article
System:
The UNT Digital Library
A Quarterly Report of Full-Time Equivalent State Employees for the Quarter Ending August 31, 1999
Report of the Texas State Auditor's Office related to information on the number of state employees and the number of consultants and contract individuals who perform services for state government.
Date:
January 2000
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History
RAD CALC III: RADIOANALYSIS CALCULATION PROGRAM FOR PLUTONIUM AND AMERICIUM DETERMINATION
None
Date:
January 1, 2000
Creator:
Blackadar, J.M. & Wong, A.S.
Object Type:
Article
System:
The UNT Digital Library
Radiological Work Planning and Procedure
Each facility is tasked with maintaining personnel radiation exposure as low as reasonably achievable (ALARA). A continued effort is required to meet this goal by developing and implementing improvements to technical work documents (TWDs) and work performance. A review of selected TWDs from most facilities shows there is a need to incorporate more radiological control requirements into the TWD. The Radioactive Work Permit (RWP) provides a mechanism to place some of the requirements but does not provide all the information needed by the worker as he/she is accomplishing the steps of the TWD. Requiring the engineers, planners and procedure writers to put the radiological control requirements in the work steps would be very easy if all personnel had a strong background in radiological work planning and radiological controls. Unfortunately, many of these personnel do not have the background necessary to include these requirements without assistance by the Radiological Control organization at each facility. In addition, there seems to be confusion as to what should be and what should not be included in the TWD.
Date:
January 1, 2000
Creator:
KURTZ, J.E.
Object Type:
Article
System:
The UNT Digital Library
Radiometric Measurements and Data for Evaluating Photovoltaics
The National Renewable Energy Laboratory (NREL) Photovoltiac Radiometric Measurements Task ddresses the impact of solar and optical radiation on photovoltaic (PV) devices. The task maintains spectral and broadband calibration capability directly traceable to the National Institute of Standards and Technology (NIST) and the World Radiometric Reference (WRR) of the World Meteorological Organization (WMO).
Date:
January 1, 2000
Creator:
Myers, D. R.; Andreas, A.; Rymes, M.; Stoffel, T.; Reda, I.; Wilcox, S. et al.
Object Type:
Article
System:
The UNT Digital Library
Rapid Prototyping of Ceramics
None
Date:
January 1, 2000
Creator:
Nunn, S.D. & Conway, B.
Object Type:
Report
System:
The UNT Digital Library
Rayburn Quadrangle
Topographic map of a portion of Texas from the United States Geological Survey (USGS) project. The map includes towns, historic or notable sites, bodies of water, and other geologic features. Scale 1:24000
Date:
2000
Creator:
United States. Forest Service.
Object Type:
Map
System:
The Portal to Texas History
The RCMS dipole aperture and beam pipe
N/A
Date:
January 1, 2000
Creator:
S., Peggs; Meng, W.; Roser, T.; Tsoupas, N. & Tuozzolo, J.
Object Type:
Report
System:
The UNT Digital Library
Records Management Interagency Coordinating Council Biennial Report: 1999-2000
Biennial report of the Records Management Interagency Coordinating Council describing the background of the agency, progress, and recommendations or how the agency should continue for the years 1999-2000.
Date:
2000~
Creator:
Records Management Interagency Coordinating Council
Object Type:
Report
System:
The Portal to Texas History
Regenerative fuel cell engineering - FY99
The authors report the work conducted by the ESA-EPE Fuel Cell Engineering Team at Los Alamos National Laboratory during FY99 on regenerative fuel cell system engineering. The work was focused on the evaluation of regenerative fuel cell system components obtained through the RAFCO program. These components included a 5 kW PEM electrolyzer, a two-cell regenerative fuel cell stack, and samples of the electrolyzer membrane, anode, and cathode. The samples of the electrolyzer membrane, anode, and cathode were analyzed to determine their structure and operating characteristics. Tests were conducted on the two-cell regenerative fuel cell stack to characterize its operation as an electrolyzer and as a fuel cell. The 5 kW PEM electrolyzer was tested in the Regenerative Fuel Cell System Test Facility. These tests served to characterize the operation of the electrolyzer and, also, to verify the operation of the newly completed test facility. Future directions for this work in regenerative fuel cell systems are discussed.
Date:
January 1, 2000
Creator:
Inbody, Michael A.; Borup, Rodney L.; Hedstrom, James C.; Tafoya, Jose; Morton, Byron; Zook, Lois et al.
Object Type:
Report
System:
The UNT Digital Library
Remote Methodology used at B Plant Hanford to Map High Radiation and Contamination Fields and Document Remaining Hazards
A remote radiation mapping system using the Gammacam{trademark} (AIL Systems Inc. Trademark) with real-time response was used in deactivating the B Plant at Hanford to produce digitized images showing actual radiation fields and dose rates. Deployment of this technology has significantly reduced labor requirements, decreased personnel exposure, and increased the accuracy of the measurements. Personnel entries into the high radiation/contamination areas was minimized for a dose savings of 30 Rem (.3 Seivert) and a cost savings of $640K. In addition, the data gathered was utilized along with historical information to estimate the amount of remaining hazardous waste in the process cells. The B Plant facility is a canyon facility containing 40 process cells which were used to separate cesium and strontium from high level waste. The cells and vessels are contaminated with chemicals used in the separation and purification processes. Most of the contaminants have been removed but the residual contamination from spills in the cells and heels in the tanks contribute to the localized high radioactivity. The Gammacam{trademark} system consists of a high density terbium-activated scintillating glass detector coupled with a digitized video camera. Composite images generated by the system are presented in pseudo color over a black and …
Date:
January 1, 2000
Creator:
SIMMONS, F.M.
Object Type:
Article
System:
The UNT Digital Library
Replace V-Belts with Cogged or Synchronous Belt Drives
This two-page abstract provides tips for plant managers on improving performance of industrial motors by designing belt-drive transmission systems for high efficiency, low noise and maintenance, and cost savings
Date:
January 1, 2000
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
Research Needs of c-Si Technology Required to Meet Roadmap Milestones
In this paper, we examine the areas in c-Si growth, materials, and processing that require improvement through research to overcome barriers to the implementation of the PV Roadmap's Si goals.
Date:
January 1, 2000
Creator:
Ruby, D. S.; Ciszek, T. & Sopori, B.
Object Type:
Article
System:
The UNT Digital Library
Residues from coal conversion and utilization: Advanced mineralogical characterization and disposed byproduct diagenesis. [Semiannual report, 1 Mar 1999--31 Aug 1999]
The goal of the project is to learn more about the phenomenon of coal conversion byproduct (CCB) diagenesis, first described by this group and co-workers at UND EERC seven years ago. CCB diagenesis is a change in the mineralogy that occurs after some CCBs are disposed in a landfill or utilized for a civil engineering application. Regulatory environmental tests and civil engineering tests are typically performed on as-generated CCBs, or on CCBs hydrated and cured for relatively short periods such as 7 or 28 days. One would like to know whether the results of these short-term tests will be valid years later. A change in mineralogy means a gain, loss or chemical redistribution of major, minor and trace elements, and alteration of physical properties. To attain this goal, two objectives were defined: (1) to develop improved methodology for quantitating mineralogy of these complex crystalline phase assemblages, and (2) to investigate the phenomenon of CCB diagenesis further by studying materials recovered from disposal landfills or civil engineering works. Objective 1--Hydrated CCBs are chemically and mineralogically complex, which makes quantitative mineralogy determination by conventional X-ray diffraction unusable or unreliable. The whole-pattern Rietveld quantitative X-ray diffraction (RQXRD) method, however, can overcome many of …
Date:
January 1, 2000
Creator:
McCarthy, Gregory J. & Grier, Dean G.
Object Type:
Report
System:
The UNT Digital Library
A REVIEW OF ANS STANDARD 19.3.4, THE DETERMINATION OF THERMAL ENERGY DEPOSITION RATES IN NUCLEAR REACTORS: THE PAST, PRESENT AND FUTURE
None
Date:
January 2000
Creator:
Perry, R. T.
Object Type:
Article
System:
The UNT Digital Library
A Review of Emerging Technologies for Sustainable Use of Coal for Power Generation
None
Date:
January 1, 2000
Creator:
Lackner, Klaus S.; Ziock, Hans-Joachim & Yegulalp, T. M.
Object Type:
Article
System:
The UNT Digital Library
Revised Emergency Planning and Community Right-to-Know Act (EPCRA), Section 313, Toxic Chemical Release reporting for calendar year 1998
This report contains forms which contain information on the physical location of the Y-12 Plant and the amount of lead that was released to the East Fork Poplar Creek and amounts transferred to landfills on-site as well as landfills in Texas and South Carolina. Amounts are given in pounds per year.
Date:
January 1, 2000
Creator:
Evans, R. A.
Object Type:
Report
System:
The UNT Digital Library
Richards Quadrangle
Topographic map of a portion of Texas from the United States Geological Survey (USGS) project. The map includes towns, historic or notable sites, bodies of water, and other geologic features. Scale 1:24000
Date:
2000
Creator:
United States. Forest Service.
Object Type:
Map
System:
The Portal to Texas History
Riverside Quadrangle
Topographic map of a portion of Texas from the United States Geological Survey (USGS) project. The map includes towns, historic or notable sites, bodies of water, and other geologic features. Scale 1:24000
Date:
2000
Creator:
United States. Forest Service.
Object Type:
Map
System:
The Portal to Texas History
Role of defects in III-nitride based electronics
The LDRD entitled ``Role of Defects in III-Nitride Based Devices'' is aimed to place Sandia National Laboratory at the forefront of the field of GaN materials and devices by establishing a scientific foundation in areas such as material growth, defect characterization/modeling, and processing (metalization and etching) chemistry. In this SAND report the authors summarize their studies such as (1) the MOCVD growth and doping of GaN and AlGaN, (2) the characterization and modeling of hydrogen in GaN, including its bonding, diffusion, and activation behaviors, (3) the calculation of energetic of various defects including planar stacking faults, threading dislocations, and point defects in GaN, and (4) dry etching (plasma etching) of GaN (n- and p-types) and AlGaN. The result of the first AlGaN/GaN heterojunction bipolar transistor is also presented.
Date:
January 1, 2000
Creator:
Han, Jung; Myers, Samuel M., Jr.; Follstaedt, David M.; Wright, Alan F.; Crawford, Mary H.; Lee, Stephen R. et al.
Object Type:
Report
System:
The UNT Digital Library
Round Up, 2000 Special
Magazine for Texas Lottery retailers that contains news, retailer spotlights, and a list of lottery winners.
Date:
2000
Creator:
Texas Lottery Commission
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Round Up, January 2000
Magazine for Texas Lottery retailers that contains news, retailer spotlights, and a list of lottery winners.
Date:
January 2000
Creator:
Texas Lottery Commission
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History