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[Letter to Dr. D. Jack Davis from Julie Anne Abel - November 9, 1998]
A letter to Dr. D. Jack Davis from Julie Anne Abel regarding a grant check from the Getty Education Institute for the Arts to the North Texas Institute for Educators on the Visual Arts (NTIEVA).
Date:
November 9, 1998
Creator:
Abel, Julie A.
Object Type:
Letter
System:
The UNT Digital Library
Group-III Nitride Etch Selectivity in BCl(3)/Cl(2) ICP Plasmas
Patterning the group-IH nitrides has been challenging due to their strong bond energies and relatively inert chemical nature as compared to other compound semiconductors. Plasma etch processes have been used almost exclusively to pattern these films. The use of high-density plasma etch systems, including inductively coupled plasmas (ICP), has resulted in relatively high etch rates (often greater than 1.0 pmhnin) with anisotropic profiles and smooth etch morphologies. However, the etch mechanism is often dominated by high ion bombardment energies which can minimize etch selectivity. The use of an ICP-generated BCl~/C12 pkyma has yielded a highly versatile GaN etch process with rates ranging from 100 to 8000 A/rnin making this plasma chemistry a prime candidate for optimization of etch selectivity. In this study, we will report ICP etch rates and selectivities for GaN, AIN, and InN as a function of BCl~/Clz flow ratios, cathode rf-power, and ICP-source power. GaN:InN and GaN:AIN etch selectivities were typically less than 7:1 and showed the strongest dependence on flow ratio. This trend maybe attributed to faster GaN etch rates observed at higher concentrations of atomic Cl which was monitored using optical emission spectroscopy (OES). ~E~~~~f:~ INTRODUCTION DEC j 4898 Etch selectivi
Date:
December 9, 1998
Creator:
Abernathy, C.R.; Han, J.; Hong, J.; Lester, L.F.; Pearton, S.J.; Shul, R.J. et al.
Object Type:
Article
System:
The UNT Digital Library
Tank waste remediation system mission analysis report
This document describes and analyzes the technical requirements that the Tank Waste Remediation System (TWRS) must satisfy for the mission. This document further defines the technical requirements that TWRS must satisfy to supply feed to the private contractors` facilities and to store or dispose the immobilized waste following processing in these facilities. This document uses a two phased approach to the analysis to reflect the two-phased nature of the mission.
Date:
January 9, 1998
Creator:
Acree, C. D.
Object Type:
Report
System:
The UNT Digital Library
Biological Monitoring Program for East Fork Poplar Creek
In May 1985, a National Pollutant Discharge Elimination System (NPDES) permit was issued for the Oak Ridge Y-12 Plant. As a condition of the permit, a Biological Monitoring and Abatement Program (BMAP) was developed to demonstrate that the effluent limitations established for the Y-12 Plant protect the classified uses of the receiving stream (East Fork Poplar Creek; EFPC), in particular, the growth and propagation of aquatic life (Lear et al. 1989). A second objective of the BMAP is to document the ecological effects resulting from the implementation of a water pollution control program designed to eliminate direct discharges of wastewaters to EFPC and to minimize the inadvertent release of pollutants to the environment. Because of the complex nature of the discharges to EFPC and the temporal and spatial variability in the composition of the discharges, a comprehensive, integrated approach to biological monitoring was developed. A new permit was issued to the Y-12 Plant on April 28, 1995 and became effective on July 1, 1995. Biological monitoring continues to be required under the new permit. The BMAP consists of four major tasks that reflect different but complementary approaches to evaluating the effects of the Y-12 Plant discharges on the aquatic integrity …
Date:
September 9, 1998
Creator:
Adams, S. M.; Beaty, T. W.; Brandt, C. C.; Christensen, S. W. & Cicerone, D. S.
Object Type:
Report
System:
The UNT Digital Library
Observation of resonant energy transfer between identical-frequency laser beams
Enhanced transmission of a low intensity laser beam is observed when crossed with an identical-frequency beam in a plasma with a flow velocity near the ion sound speed. The time history of the enhancement and the dependence on the flow velocity strongly suggest that this is due to energy transfer between the beams via a resonant ion wave with zero frequency in the laboratory frame. The maximum energy transfer has been observed when the beams cross in a region with Mach 1 flow. The addition of frequency modulation on the crossing beams is seen to reduce the energy transfer by a factor of two. Implications for indirect-drive fusion schemes are discussed.
Date:
December 9, 1998
Creator:
Afeyan, B. B.; Cohen, B. I.; Estabrook, K. G.; Glenzer, S. H.; Joshi, C.; Kirkwood, R. K. et al.
Object Type:
Article
System:
The UNT Digital Library
China’s Economy: Findings of a Research Trip
This report is on China’s Economy: Findings of a Research Trip.
Date:
February 9, 1998
Creator:
Ahearn, Raymond J.
Object Type:
Report
System:
The UNT Digital Library
The Oklahoma Daily (Norman, Okla.), Vol. 83, No. 20, Ed. 1 Wednesday, September 9, 1998
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
September 9, 1998
Creator:
Allam, Heather
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Oklahoma Daily (Norman, Okla.), Vol. 83, No. 62, Ed. 1 Monday, November 9, 1998
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
November 9, 1998
Creator:
Allam, Heather
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Micromachined Systems-on-a-Chip: Infrastructure, Technology and Applications
A review is made of the infrastructure, technology and capabilities of Sandia National Laboratories for the development of micromechanical systems that have potential space applications. By incorporating advanced fabrication processes, such as chemical mechanical polishing, and several mechanical polysilicon levels, the range' of rrticromechanical systems that can be fabricated in these technologies is virtually limitless. Representative applications include a micro- engine driven mirror, and a micromachined lock. Using a novel integrated MEM!YCMOS technology, a six degree-of-freedom accelerometer/gyroscope system has been designed by researchers at U.C. Berkeley and fabricated on the same silicon chip as the CMOS control circuits to produce an integrated micro-navigational unit.
Date:
October 9, 1998
Creator:
Allen, J. J.; Krygowski, T. W.; Miller, S. L.; Montague, S.; Rodgers, M. S.; Schriner, H. et al.
Object Type:
Article
System:
The UNT Digital Library
Azalea Festival
Photograph of a scene during the Azalea Festival, in Honor Heights Park.
Date:
April 9, 1998
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Azalea Festival
Photograph of a scene during the Azalea Festival, in Honor Heights Park.
Date:
April 9, 1998
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Azalea Festival
Photograph of a scene during the Azalea Festival, in Honor Heights Park.
Date:
April 9, 1998
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Azalea Festival
Photograph of a scene during the Azalea Festival, in Honor Heights Park.
Date:
April 9, 1998
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Azalea Festival
Photograph of a scene during the Azalea Festival, in Honor Heights Park.
Date:
April 9, 1998
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Azalea Festival
Photograph of a scene during the Azalea Festival, in Honor Heights Park.
Date:
April 9, 1998
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Azalea Festival
Photograph of a scene during the Azalea Festival, in Honor Heights Park.
Date:
April 9, 1998
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Azalea Festival
Photograph of a scene during the Azalea Festival, in Honor Heights Park.
Date:
April 9, 1998
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Azalea Festival
Photograph of a scene during the Azalea Festival, in Honor Heights Park.
Date:
April 9, 1998
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Azalea Festival
Photograph of a scene during the Azalea Festival, in Honor Heights Park.
Date:
April 9, 1998
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Azalea Festival
Photograph of a scene during the Azalea Festival, in Honor Heights Park.
Date:
April 9, 1998
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Azalea Festival
Photograph of a scene during the Azalea Festival, in Honor Heights Park.
Date:
April 9, 1998
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Azalea Festival
Photograph of a scene during the Azalea Festival, in Honor Heights Park.
Date:
April 9, 1998
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Archer County News (Archer City, Tex.), No. 15, Ed. 1 Thursday, April 9, 1998
Weekly newspaper from Archer City, Texas that includes local, state and national news along with advertising.
Date:
April 9, 1998
Creator:
Armstrong, Sonny
Object Type:
Newspaper
System:
The Portal to Texas History
Archer County News (Archer City, Tex.), No. 28, Ed. 1 Thursday, July 9, 1998
Weekly newspaper from Archer City, Texas that includes local, state and national news along with advertising.
Date:
July 9, 1998
Creator:
Armstrong, Sonny
Object Type:
Newspaper
System:
The Portal to Texas History