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High performance anti-reflection coatings for broadband multi-junction solar cells
The success of bandgap engineering has made high efficiency broadband multi-junction solar cells possible with photo-response out to the band edge of Ge. Modeling has been conducted which suggests that current double layer anti-reflection coating technology is not adequate for these devices in certain cases. Approaches for the development of higher performance anti-reflection coatings are examined. A new AR coating structure based on the use of Herpin equivalent layers is presented. Optical modeling suggests a decrease in the solar weighted reflectance of over 2.5{percent} absolute as a result. This structure requires no additional optical material development and characterization because no new optical materials are necessary. Experimental results and a sensitivity analysis are presented.
Date:
February 23, 2000
Creator:
AIKEN,DANIEL J.
Object Type:
Article
System:
The UNT Digital Library
Significance of Soft Zone Sediments at the SRS
The purpose of this report is to provide information on the origin, extent and stability of ''soft zones'' in the carbonate bearing strata at the Savannah River Site (SRS). As part of this study, a comprehensive historical compendium of how soft zones have been addressed during the past 47 years at SRS is reviewed.
Date:
February 3, 2000
Creator:
Aadland, R. K.
Object Type:
Report
System:
The UNT Digital Library
Phenomenology of the deuteron electromagnetic form factors
A rigorous extraction of the deuteron charge form factors from tensor polarization data in elastic electron-deuteron scattering, at given values of the 4-momentum transfer, is presented. Then the world data for elastic electron-deuteron scattering is used to parameterize, in three different ways, the three electromagnetic form factors of the deuteron in the 4-momentum transfer range 0-7 fm. This procedure is made possible with the advent of recent polarization measurements. The parameterizations allow a phenomenological characterization of the deuteron electromagnetic structure. They can be used to remove ambiguities in the form factors extraction from future polarization data.
Date:
February 25, 2000
Creator:
Abbott, David; Ahmidouch, Abdellah; Anklin, H.; Arvieux, J.; Ball, James P.; Beedoe, Shelton et al.
Object Type:
Article
System:
The UNT Digital Library
Abilene Philharmonic Playbill: February 19-March 11, 2000
Program for an Abilene Philharmonic concert that ran from February 19th to March 11th (Classical and pop concert) during the 50th season. It includes information about the pieces performed, artists and musicians, and advertising from local companies.
Date:
February 2000
Creator:
Abilene Philharmonic
Object Type:
Pamphlet
System:
The Portal to Texas History
Applying Overseas Missions Strategies Across Town
Lecture given Monday, February 21, 2000, 8:30 AM at Abilene Christian University: "If we can plant growing churches in Latin America, why not get local Spanish evangelistic efforts off and running?"
Date:
February 21, 2000
Creator:
Acosta, Albert
Object Type:
Sound
System:
The Portal to Texas History
The Nuts and Bolts of Growing Hispanic Works
Lecture given Monday, February 21, 2000, 11:00 AM at Abilene Christian University: "If we can plant growing churches in Latin America, why not get local Spanish evangelistic efforts off and running?"
Date:
February 21, 2000
Creator:
Acosta, Albert
Object Type:
Sound
System:
The Portal to Texas History
A Theology for Working with Hispanics
Lecture given Monday, February 21, 2000, 3:30 PM at Abilene Christian University: "If we can plant growing churches in Latin America, why not get local Spanish evangelistic efforts off and running?"
Date:
February 21, 2000
Creator:
Acosta, Albert
Object Type:
Sound
System:
The Portal to Texas History
Letter of Intent for RPP Characterization Program Process Engineering and Hanford Analytical Services and Characterization Project
The Characterization Project level of success achieved by the River Protection Project (RPP) is determined by the effectiveness of several organizations across RPP working together. The requirements, expectations, interrelationships, and performance criteria for each of these organizations were examined in order to understand the performances necessary to achieve characterization objectives. This Letter of Intent documents the results of the above examination. It formalizes the details of interfaces, working agreements, and requirements for obtaining and transferring tank waste samples from the Tank Farm System (RPP Process Engineering, Characterization Project Operations, and RPP Quality Assurance) to the characterization laboratory complex (222-S Laboratory, Waste Sampling and Characterization Facility, and the Hanford Analytical Service Program) and for the laboratory complex analysis and reporting of analytical results.
Date:
February 25, 2000
Creator:
Adams, M. R.
Object Type:
Report
System:
The UNT Digital Library
Tank Characterization Report for Single Shell Tank 241-U-103
This document summarizes the information on the historical uses, present status, and the sampling and analysis results of waste stored in Tank 241-U-103. This report supports the requirements of the Tri-Party Agreement Milestone M-44-15B.
Date:
February 1, 2000
Creator:
Adams, M. R.
Object Type:
Report
System:
The UNT Digital Library
Landfill cover revegetation using organic amendments and cobble mulch in the arid southwest
Cobble mulch and composted biosolids, greenwaste, and dairy manure were added to arid soil in an attempt to improve plant establishment and production, minimize erosion, increase evapotranspiration, and reduce leaching. Twenty-four plots (10 x 10 m) were established in a completely randomized block design (8 treatments, 3 plots per treatment). Treatments included (1) non-irrigated control, (2) irrigated control, (3) non-irrigated greenwaste compost (2.5 yd{sup 3} per plot), (4) irrigated greenwaste compost (5 yd{sup 3} per plot), (5) non-irrigated biosolids compost (2.5 yd{sup 3} per plot), (6) irrigated biosolids compost (5 yd{sup 3} per plot), (7) cobble-mulch, and (8) non-irrigated dairy manure compost (2.5 yd{sup 3} per plot). Soil samples were collected from each plot for laboratory analyses to assess organic matter contents, macro-nutrient levels and trace metal contents, and nitrogen mineralization potential. All plots were seeded similarly with approximately equal portions of cool and warm season native grasses. The organic composts (greenwaste, biosolids, dairy manure) added to the soils substantially increased soil organic matter and plant nutrients including total nitrogen and phosphorus. However, the results of a laboratory study of the soils' nitrogen mineralization potential after the application of the various composts showed that the soil nitrogen-supplying capability decreased to …
Date:
February 1, 2000
Creator:
Aguilar, Richard; Dwyer, Stephen F.; Reavis, Bruce A.; Newman, Gretchen Carr & Loftin, Samuel R.
Object Type:
Report
System:
The UNT Digital Library
Trade Legislation in the 106th Congress: An Overview
None
Date:
February 8, 2000
Creator:
Ahearn, Raymond J.
Object Type:
Report
System:
The UNT Digital Library
Improving paper machine efficiency through on-line control of stock delivery, headbox and forming hydrodynamics. Quarterly report
None
Date:
February 1, 2000
Creator:
Aidun, Cyrus K.
Object Type:
Report
System:
The UNT Digital Library
Extraction of pores from microtomographic reconstructions of intact soil aggregates
Segmentation of features is often a necessary step in the analysis of volumetric data. The authors have developed a simple technique for extracting voids from irregular volumetric data sets. In this work they look at extracting pores from soil aggregates. First, they identify a threshold that gives good separability of the object from the background. They then segment the object, and perform connected components analysis on the pores within the object. Using their technique pores that break the surface can be segmented along with pores completely contained in the initially segmented object.
Date:
February 29, 2000
Creator:
Albee, P. B.; Stockman, G. C. & Smucker, A. J. M.
Object Type:
Article
System:
The UNT Digital Library
Radiation dose measurements of the insertion devices
The Advanced Photon Source (APS) uses Nd-Fe-B permanent magnets in the insertion devices to produce x-rays for scientific research. Earlier investigations have exhibited varying degrees of demagnetization of these magnets due to irradiation from electron beams, {sup 60}Co {gamma}-rays, and high-energy neutrons. Although no detectable radiation-induced demagnetization has been observed in the APS insertion devices so far, partial demagnetization has been observed in at lest one insertion device at the European Synchrotron Radiation Facility (ESRF), where Nd-Fe-B permanent magnets are also used. A growing concern for the APS insertion devices, as well as the permanent magnets that will be used in next generation high-power light sources, like the FEL, resulted from the partial demagnetization observed in the ESRF devices. This concern in relation to radiation-induced demagnetization spurred a long-term project aimed to measure and analyze the total absorbed doses received by the APS insertion devices. The project required a reliable photon high dose dosimetry technique capable of measuring absorbed doses greater than 10{sup 6} rad, which was not readily available at the APS. Through a collaboration with the National Institute of Standards and Technology (NIST), one such technique using radiachromic films was considered, tested, and calibrated at the APS. This …
Date:
February 28, 2000
Creator:
Alderman, J.; Semones, E. & Job, P.K.
Object Type:
Report
System:
The UNT Digital Library
Oral History Interview with Harold Salfen, February 14, 2000
Access:
Use of this item is restricted to the UNT Community
Interview with Harold Salfen, a Army Air Force WWII veteran from O'Fallon, Missouri. Salfen discusses his hometown and family background, his childhood and education, working in St. Louis, attending the University of Missouri, joining the Army Air Force and training, operating a ground radar in the European Theater, liberating Buchenwald Concentration Camp, the end of the war, and returning home. In appendix is a biography/resumé of Salfen's.
Date:
February 14, 2000
Creator:
Alexander, William J. & Salfen, Harold
Object Type:
Book
System:
The UNT Digital Library
ENVELOPE OSCILLATIONS AND HALO FORMATION IN BUNCHED BEAMS: A PERTURBATIONAL APPROACH
None
Date:
February 1, 2000
Creator:
Allen, Christopher K.
Object Type:
Article
System:
The UNT Digital Library
Sensors for Detection of Gases in High-Voltage Power Transformers: A Research Program for Understanding and Improving Their Performance
None
Date:
February 21, 2000
Creator:
Allendorf, M. D.; Lutz, A. E.; Bastasz, R. & Klinke, D. J.
Object Type:
Article
System:
The UNT Digital Library
Dynamic Pressure of Liquid Mercury Target During 800-MeV Proton Thermal Shock Tests
Described here are efforts to diagnose transient pressures generated by a short-pulse (about 0.5 microseconds) high intensity proton ({approximately} 2 * 10 14 per pulse) beam. Proton energy is 800-MeV. The tests were performed at the Los Alamos Neutron Science Center - Weapons Neutron Research (LANSCE-WNR). Such capability is required for understanding target interaction for the Spallation Neutron Source project as described previously at this conference.1-4 The main approach to effect the pressure measurements utilized the deflection of a diaphragm in intimate contact with the mercury. There are a wide variety of diaphragm-deflection methods used in scientific and industrial applications. Many deflection-sensing approaches are typically used, including, for instance, capacitive and optical fiber techniques. It was found, however, that conventional pressure measurement using commercial pressure gages with electrical leads was not possible due to the intense nuclear radiation enviro nment. Earlier work with a fiber optic strain gauge demonstrated the viability of using fiber optics for this environment.
Date:
February 1, 2000
Creator:
Allison, S. W.; Andriulli, J. B.; Cates, M. R.; Earl, D. D.; Haines, J. R.; Morrissey, F. X. et al.
Object Type:
Report
System:
The UNT Digital Library
Molecular dynamics simulation of cascade damage in gold
High-energy cascades have been simulated in gold using molecular dynamics with a modified embedded atom method potential. The results show that both vacancy and interstitial clusters form with high probability as a result of intracascade processes. The formation of clusters has been interpreted in terms of the high pressures generated in the core of the cascade during the early stages. We provide evidence that correlation between interstitial and vacancy clustering exists.
Date:
February 1, 2000
Creator:
Alonso, E.; Caturla, M. J.; Tang, M.; Huang, H. & Diaz de la Rubia, T
Object Type:
Article
System:
The UNT Digital Library
McKenzie River Subbasin Assessment, Summary Report 2000.
This document summarizes the findings of the McKenzie River Subbasin Assessment: Technical Report. The subbasin assessment tells a story about the McKenzie River watershed. What is the McKenzie's ecological history, how is the McKenzie doing today, and where is the McKenzie watershed headed ecologically? Knowledge is a good foundation for action. The more we know, the better prepared we are to make decisions about the future. These decisions involve both protecting good remaining habitat and repairing some of the parts that are broken in the McKenzie River watershed. The subbasin assessment is the foundation for conservation strategy and actions. It provides a detailed ecological assessment of the lower McKenzie River and floodplain, identifies conservation and restoration opportunities, and discusses the influence of some upstream actions and processes on the study area. The assessment identifies restoration opportunities at the reach level. In this study, a reach is a river segment from 0.7 to 2.7 miles long and is defined by changes in land forms, land use, stream junctions, and/or cultural features. The assessment also provides flexible tools for setting priorities and planning projects. The goal of this summary is to clearly and concisely extract the key issues, findings, and recommendations from …
Date:
February 1, 2000
Creator:
Alsea Geospatial, Inc.
Object Type:
Report
System:
The UNT Digital Library
McKenzie River Subbasin Assessment, Technical Report 2000.
This document details the findings of the McKenzie River Subbasin Assessment team. The goal of the subbasin assessment is to provide an ecological assessment of the McKenzie River Floodplain, identification of conservation and restoration opportunities, and discussion of the influence of some upstream actions and processes. This Technical Report can be viewed in conjunction with the McKenzie River Subbasin Summary or as a stand-alone document. The purpose of the technical report is to detail the methodology and findings of the consulting team that the observations and recommendations in the summary document are based on. This part, Part I, provides an introduction to the subbasin and a general overview. Part II details the specific findings of the science team. Part III provides an explanation and examples of how to use the data that has been developed through this assessment to aid in prioritizing restoration activities. Part III also includes the literature cited and appendices.
Date:
February 1, 2000
Creator:
Alsea Geospatial, Inc.
Object Type:
Report
System:
The UNT Digital Library
Recovering the Centrality of Prayer for Evangelism
Lecture given Monday, February 21, 2000, 8:30 AM at Abilene Christian University: "In the dawn of the new millennium, the church searches for better methods to reach the lost. The Lord's Prayer reminds us that the challenges of evangelism in the new millennium will be overcome not with programs but with prayer."
Date:
February 21, 2000
Creator:
Altrock, Chris
Object Type:
Sound
System:
The Portal to Texas History
Effective Outreach to Hispanic Communities
Lecture given Wednesday, February 23, 2000, 3:30 PM at Abilene Christian University: "Numerically, theologically and ministerialy, Spanish-speaking Churches of Christ have grown out of the roots of Catholicism, Pentecostalism and influences known as curanderismo (ethnobotany or folk healing)."
Date:
February 23, 2000
Creator:
Alvarez, Abel & Blackwell, Mike
Object Type:
Sound
System:
The Portal to Texas History
History of Iglesias de Cristo to the Present
Lecture given Wednesday, February 23, 2000, 8:30 AM at Abilene Christian University: "Numerically, theologically and ministerialy, Spanish-speaking Churches of Christ have grown out of the roots of Catholicism, Pentecostalism and influences known as curanderismo (ethnobotany or folk healing)."
Date:
February 23, 2000
Creator:
Alvarez, Abel & Blackwell, Mike
Object Type:
Sound
System:
The Portal to Texas History