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147,374 Matching Results
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Pasadena 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:
Geological Survey (U.S.)
Object Type:
Map
System:
The Portal to Texas History
Performance of Image Intensifiers in Radiographic Systems
Electronic charge-coupled device (CCD) cameras equipped with image intensifiers are increasingly being used for radiographic applications. These systems may be used to replace film recording for static imaging, or at other times CCDs coupled with electro-optical shutters may be used for static or dynamic (explosive) radiography. Image intensifiers provide precise shuttering and signal gain. The authors have developed a set of performance measures to calibrate systems, compare one system to another, and to predict experimental performance. The performance measures discussed in this paper are concerned with image quality parameters that relate to resolution and signal-to-noise ratio.
Date:
January 1, 2000
Creator:
Baker, S. A.
Object Type:
Article
System:
The UNT Digital Library
PERFORMANCE OF IMAGE INTENSIFIERS IN RADIOGRAPHIC SYSTEMS
None
Date:
January 1, 2000
Creator:
Baker, S. & King, N.
Object Type:
Article
System:
The UNT Digital Library
Perspective on International PV Challenge & Opportunities for Rural Development
International market opportunities for the sale and deployment of photovoltaic (PV) systems abound and will continue to out-pace domestic, grid-connected opportunities for the foreseeable future.
Date:
January 1, 2000
Creator:
Taylor, R. W.
Object Type:
Article
System:
The UNT Digital Library
Phasing Cooling Systems
None
Date:
January 1, 2000
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Phelps 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
Photothermal Stability of Various Module Encapsulants and Effects of Superstrate and Substrate Materials Studied for PVMaT Sources
This paper briefs the photothermal reliability studies we conducted on different encapsulation materials for some U.S. PV companies that are subcontractors of the Photovoltaic Manufacturing Technology (PVMaT) program.
Date:
January 1, 2000
Creator:
Pern, F. J. & Glick, S. H.
Object Type:
Article
System:
The UNT Digital Library
Photovoltaics for Buildings: Case Studies of High-Performance Buildings with PV
Energy efficiency maximizes the value of photovoltaics (PV) in buildings systems. A fixed-sizre PV system will offset a much larger part of the electrical load in an energy-efficient building than in a building whose energy design has not been optimized.
Date:
January 1, 2000
Creator:
Hayter, S. J. & Torcellini, P. A.
Object Type:
Article
System:
The UNT Digital Library
Pine Prairie 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
Pinon Pine Tree Study, Los Alamos National Laboratory: Source document
One of the dominant tree species growing within and around Los Alamos National Laboratory (LANL), Los Alamos, NM, lands is the pinon pine (Pinus edulis) tree. Pinon pine is used for firewood, fence posts, and building materials and is a source of nuts for food--the seeds are consumed by a wide variety of animals and are also gathered by people in the area and eaten raw or roasted. This study investigated the (1) concentration of {sup 3}H, {sup 137}Cs, {sup 90}Sr, {sup tot}U, {sup 238}Pu, {sup 239,240}Pu, and {sup 241}Am in soils (0- to 12-in. [31 cm] depth underneath the tree), pinon pine shoots (PPS), and pinon pine nuts (PPN) collected from LANL lands and regional background (BG) locations, (2) concentrations of radionuclides in PPN collected in 1977 to present data, (3) committed effective dose equivalent (CEDE) from the ingestion of nuts, and (4) soil to PPS to PPN concentration ratios (CRs). Most radionuclides, with the exception of {sup 3}H in soils, were not significantly higher (p < 0.10) in soils, PPS, and PPN collected from LANL as compared to BG locations, and concentrations of most radionuclides in PPN from LANL have decreased over time. The maximum net CEDE (the …
Date:
January 1, 2000
Creator:
Fresquez, P. R.; Huchton, J. D.; Mullen, M. A. & L. Naranjo, Jr.
Object Type:
Report
System:
The UNT Digital Library
Plutonium source isotopic analysis with up to 25 mm Pb shielding using the FRAM Isotopic Analysis Code.
The FRAM Isotopics Analysis Code has been used to analyze plutonium spectra taken through very thick shielding. Three plutonium sources with 240Pu content of 6.6%, 9.7%, and 16.3% were measured with lead shielding thicknesses ranging from zero to 25.3 mm, in nominal increments of 1.6mm. Multiple spectra were taken for each sample at each shielding level, and the spectra were analyzed using FRAM V3.2. A new parameter set was developed to analyze spectra from zero to 25 mm lead. We will report on the accuracy capabilities of this parameter set.
Date:
January 1, 2000
Creator:
Hypes, Philip A.
Object Type:
Article
System:
The UNT Digital Library
POC-SCALE TESTING OF A DRY TRIBOELECTROSTATIC SEPARATOR FOR FINE COAL CLEANING
During the past quarter, several modifications were made to the TES unit and the materials handling system. The cylindrical electrodes were replaced by a set of screen electrodes to provide a more uniform electrostatic field. The problem with the recycle conveyor neutralizing the particle charge was also corrected by replacing it with a bucket elevator. In addition, problems with the turbocharger were corrected by increasing the number of charging stages from one to two. These modifications have significantly improved the separation performance and have permitted the POC-scale unit to achieve results in line with those obtained by the bench-scale separator. The testing phase of the project was continued at a rapid pace during this quarter. The test work showed that the modifications to the TES unit and the reduction in feed size from 28 mesh to 35 mesh resulted in significant overall improvement in yield and combustible recovery compared to the data reported in the last quarter. At that time, there was a significant discrepancy between the bench-scale and the pilot-scale results. The pilot-scale test work is now approaching the bench scale test results. However, further pilot-scale test work is required to further improve the results and duplicate the bench-scale …
Date:
January 1, 2000
Creator:
Yoon, R. H.; Luttrell, G. H. & Walters, A. D.
Object Type:
Report
System:
The UNT Digital Library
Pollution Prevention and Best Management Practices Plan for State Waste Discharge Permits ST-4508 - ST-4509 and ST-4510
On December 23, 1991, the U.S. Department of Energy, Richland Operations Office (DOE-RL) and the Washington State Department of Ecology (Ecology) agreed to adhere to the provisions of Department of Ecology Consent Order No. DE 91NM- 177 (Consent Order). The Consent Order lists regulatory milestones for liquid effluent streams on the Hanford Site to comply with the permitting requirements of Washington Administrative Code (WAC) 173-216, State Waste Discharge Permit Program, or WAC 173-21 8, Washington Underground Injection Control Program, where applicable. Hanford Site liquid effluent streams discharging to the soil column are categorized in the Consent Order as follows: Phase I Streams; Phase II Streams; and Miscellaneous Streams. Phase I and Phase II Streams are addressed in two reports: Plan and Schedule to Discontinue Disposal of Contaminated Liquids into the Soil Column at the Hanford Site (DOE-RL 1987), and Annual Status of the Report of the Plan and schedule to Discontinue Disposal of Contaminated Liquids into the Soil Column at the Hanford Site (WHC-EP-0196-1). There originally were 33 Phase I and Phase II Streams; however, some streams have been eliminated. Miscellaneous streams are those liquid effluent streams discharged to the ground that arc not categorized as Phase I or Phase …
Date:
January 1, 2000
Creator:
WILLIAMS, J.F.
Object Type:
Report
System:
The UNT Digital Library
Preliminary Experience with ''In-Site'' Baking of Niobium Cavities
In a series of experiments several single cell and multi-cell niobium cavities made from reactor grade and high RRR niobium (frequencies were 700 MHz, 1300 MHz and 1497 MHz) have been baked--after initial testing--in-situ around 145 C for up to 90 hours prior to being recooled. Surprisingly, all cavities showed significant improvements in Q-values between 4.2 and 1.6K. The BCS surface resistance was lowered by nearly a factor of two. This cannot be explained by solely a reduction of dielectric losses caused by adsorbates at the surface or by a decrease of the mean free path due to possibly diffusion of oxygen into the surface layer. In several experiments also the high field behavior of the cavity improved after the in-situ baking procedure. The observed effect opens the possibility for the CEBAF upgrade cavities, which in turn will permit to run the cavities at higher gradients if field emission loading can be prevented. Utilizing this effect can possibly translate into sizeable cost savings since fewer modules are needed for the upgrade program.
Date:
January 1, 2000
Creator:
Kneisel, P.
Object Type:
Article
System:
The UNT Digital Library
Preliminary Investigations of Outdoor Meteorological Broadband and Spectral Conditions for Evaluating Photovoltaic Modules and Systems
Historically, flat-plate photovoltaic (PV) modules have been rated at "peak-output" for power generated under Standard; Reporting Conditions (SRC) of 1000 Watts per square meter W/m2 global irradiance at a standard temperature (25degC) and reference spectral distribution. We examine the direct-normal irradiance, spectral distribution, ambient temperature, and wind speed to be used for evaluating flatplate and concentrator module performance. Our study is based upon the 30-year U.S. National Solar Radiation Data Base for conditions observed when the global irradiance on a 2-axis-tracked surface is 1000 W/m2. Results show commonly-used values for concentrator testing of 850 W/m2 for direct-normal irradiance and 20degC for ambient temperature are appropriate. Wind speed should be increased from 1 m/s to a more frequently observed 4 m/s. Differences between the reference direct-normal spectrum and spectra measured at three sites when broadband direct-normal irradiance and global-normal irradiance are near SRC irradiances suggest revisions to the reference spectra may be needed.
Date:
January 1, 2000
Creator:
Myers, D. R.; Kurtz, S. R.; Whitaker, C. & Townsend, T.
Object Type:
Article
System:
The UNT Digital Library
Preparatory Commission for the Comprehensive Nuclear Test Ban Treaty Organization: Report of the On-Site Inspection Workshop-5-Planning Examination of Inspection Phases
On-Site Inspection (OSI) Workshop-5 met 8-12 November, 1999 in Farnborough, UK and was hosted by the Defence Evaluation and Research Agency (DERA). The purpose of the workshop was to provide guidance on OSI Operational Manual (OM) development for Working Group B (WGB) of the CTBT Preparatory Commission (PrepCom). The two main topics of the workshop involved logistics/preparatory activities for the pre-inspection phase and in-depth examination of technology application during the initial and continuation phases of an OSI. Reports from the PTS-sponsored Kazakhstan OSI experiment set the tone for the discussions of logistics and preparatory activities. The most important recommendation coming out of the experiment and workshop discussions is a need for Working Group A to develop specific administrative and financial rules regarding OSIs and define the status of inspectors and inspector assistants with respect to the CTBTO. There was also extensive discussion of a need for Working Group B to develop and/or adapt safety standards. With respect to OSI preparations, the group agreed that the time line and quick response required by an OSI necessitate development of special procedures; standing arrangements and/or advanced parties are suggested as one possible approach and a list of relevant issues has been initiated. A …
Date:
January 1, 2000
Creator:
Krioutchenkov, V.; Shchukin, V.; Davies, A. & Sweeney, J. J.
Object Type:
Report
System:
The UNT Digital Library
Procedures at NREL for Evaluating Multijunction Concentrator Cells
The procedures for evaluating the performance of multijunctiion-concentrator cells at the National Renewable Energy Laboratory are described. The accurate measurement of the performance of multijunction cells requires accurate relative-quantum-efficiency-measurements, "matched" reference cells, and a spectrally adjustable solar simulator.
Date:
January 1, 2000
Creator:
Moriarty, T. & Emery, K.
Object Type:
Article
System:
The UNT Digital Library
Procedures for Determining the Performance of Stand-Alone Photovoltaic Systems
Standard test procedures are being developed to assess the performance of stand-alone photovoltaic (PV) systems. This paper will present an overview of the latest procedure.
Date:
January 1, 2000
Creator:
McNutt, P.; Kroposki, B.; Hansen, R. & DeBlasio, R.
Object Type:
Article
System:
The UNT Digital Library
Processing Effects on Junction Interdiffusion in CdS/CdTe Polycrystalline Devices
The performance of CdS/CdTe solar cells is strongly impacted by the process used to grow the CdS layer. CdS films grown by chemical-bath deposition (CBD) exhibit lower sublimation (CSS).
Date:
January 1, 2000
Creator:
Albin, D.; Yan, Y.; King, D.; Moutinho, H.; Jones, K.; Matson, R. et al.
Object Type:
Article
System:
The UNT Digital Library
Production of hydrogen in non oxygen-evolving systems: co-produced hydrogen as a bonus in the photodegradation of organic pollutants and hydrogen sulfide
This report was prepared as part of the documentation of Annex 10 (Photoproduction of Hydrogen) of the IEA Hydrogen Agreement. Subtask A of this Annex concerned photo-electrochemical hydrogen production, with an emphasis on direct water splitting. However, studies of non oxygen-evolving systems were also included in view of their interesting potential for combined hydrogen production and waste degradation. Annex 10 was operative from 1 March 1995 until 1 October 1998. One of the collaborative projects involved scientists from the Universities of Geneva and Bern, and the Federal Institute of Technology in Laussane, Switzerland. A device consisting of a photoelectrochemical cell (PEC) with a WO{sub 3} photoanode connected in series with a so-called Grazel cell (a dye sensitized liquid junction photovoltaic cell) was developed and studied in this project. Part of these studies concerned the combination of hydrogen production with degradation of organic pollutants, as described in Chapter 3 of this report. For completeness, a review of the state of the art of organic waste treatment is included in Chapter 2. Most of the work at the University of Geneva, under the supervision of Prof. J. Augustynski, was focused on the development and testing of efficient WO{sub 3} photoanodes for the …
Date:
January 1, 2000
Creator:
Sartoretti, C. Jorand; Ulmann, M.; Augustynski, J. & Linkous, C. A.
Object Type:
Report
System:
The UNT Digital Library
[Project Summary: Coastal Marine Ecosystem Program: Distribution and Abundance of Marine Mammals in the Gulf of Mexico (GulfCet II)]
Summary describing the work completed at Texas A & M University for 'Coastal Marine Ecosystem Program: Distribution and Abundance of Marine Mammals in the Gulf of Mexico (GulfCet II).' It includes background information on the project funding and sponsorship, goals, methodology, and findings.
Date:
January 2000
Creator:
Texas A & M University
Object Type:
Text
System:
The UNT Digital Library
[Project Summary: Estimation of Fisheries Impacts Due to Underwater Explosives Used to Sever and Salvage Petroleum Platforms]
Summary describing the work completed at National Marine Fisheries Service, Southeast Fisheries Science Center for 'Estimation of Fisheries Impacts Due to Underwater Explosives Used to Sever and Salvage Petroleum Platforms.' It includes background information on the project funding and sponsorship, goals, methodology, and findings.
Date:
2000
Creator:
National Marine Fisheries Service, Southeast Fisheries Science Center
Object Type:
Text
System:
The UNT Digital Library
[Project Summary: Wave Climate and Boundary Layer Dynamics with Implications for Offshore Sand Mining and Barrier Island Replenishment, South-Central Louisiana]
Summary describing the work completed at Louisiana State University Coastal Studies Institute for 'Wave Climate and Boundary Layer Dynamics with Implications for Offshore Sand Mining and Barrier Island Replenishment, South-Central Louisiana.' It includes background information on the project funding and sponsorship, goals, methodology, and findings.
Date:
2000
Creator:
Louisiana State University (Baton Rouge, La.). Coastal Studies Institute.
Object Type:
Text
System:
The UNT Digital Library
Pulsating hydrodynamic instability and thermal coupling in an extended Landau/Levich model of liquid-propellant combustion. 2. Viscous analysis
A pulsating form of hydrodynamic instability has recently been shown to arise during liquid-propellant deflagration in those parameter regimes where the pressure-dependent burning rate is characterized by a negative pressure sensitivity. This type of instability can coexist with the classical cellular, or Landau, form of hydrodynamic instability, with the occurrence of either dependent on whether the pressure sensitivity is sufficiently large or small in magnitude. For the inviscid problem, it has been shown that when the burning rate is realistically allowed to depend on temperature as well as pressure, that sufficiently large values of the temperature sensitivity relative to the pressure sensitivity causes the pulsating form of hydrodynamic instability to become dominant. In that regime, steady, planar burning becomes intrinsically unstable to pulsating disturbances whose wavenumbers are sufficiently small. In the present work, this analysis is extended to the fully viscous case, where it is shown that although viscosity is stabilizing for intermediate and larger wavenumber perturbations, the intrinsic pulsating instability for small wavenumbers remains. Under these conditions, liquid-propellant combustion is predicted to be characterized by large unsteady cells along the liquid/gas interface.
Date:
January 1, 2000
Creator:
Margolis, Stephen B.
Object Type:
Report
System:
The UNT Digital Library