Partner
UNT Libraries Government Documents Department
259
Oklahoma Historical Society
51
UNT Libraries Special Collections
43
Sterling Municipal Library
12
Texas Historical Commission
12
San Antonio Public Library
7
Alvin Community College
6
Carl Albert Congressional Research and Studies Center
6
UNT Libraries
5
Livingston Municipal Library
4
52 More
Collection
Office of Scientific & Technical Information Technical Reports
200
Texas Digital Newspaper Program
108
Oklahoma Digital Newspaper Program
59
Tocker Foundation Grant
57
Government Accountability Office Reports
23
The Black Academy of Arts and Letters Records
22
Congressional Research Service Reports
18
Texas Attorney General Opinions
14
The Baytown Sun
12
Chickasha Newspaper Collection
12
90 More
Degree Department
Country
Year
Month
Day
Language
prev
Results:
481 - 500 of
500
InGaP/InGaAsN/GaAs NpN double heterojunction bipolar transistor
The authors have demonstrated a functional NpN double heterojunction bipolar transistor (DHBT) using InGaAsN for base layer. The InGaP/In{sub 0.03}Ga{sub 0.97}As{sub 0.99}N{sub 0.01}/GaAs DHBT has a low V{sub ON} of 0.81 V, which is 0.13 V lower than in a InGaP/GaAs HBT. The lower V{sub ON} is attributed to the smaller bandgap (E{sub g}=1.20eV) of MOCVD grown In{sub 0.03}Ga{sub 0.97}As{sub 0.99}N{sub 0.01} base layer. GaAs is used for the collector; thus the BV{sub CEO} is 10 V, consistent with the BV{sub CEO} of InGaP/GaAs Hbts of comparable collector thickness and doping level. To alleviate the current blocking phenomenon caused by the larger {triangle}E{sub C} between InGaAsN and GaAs, a graded InGaAs layer with {delta}-doping is inserted at the base-collector junction. The improved device has a peak current gain of 7 with ideal IV characteristics.
Date:
January 10, 2000
Creator:
Chang, P. C.; Baca, A. G.; Li, N. Y.; Xie, X. M.; Sharps, P. R. & Hou, H. Q.
Object Type:
Article
System:
The UNT Digital Library
Integrated Environment and Safety and Health Management System (ISMS) Implementation Project Plan
The Integrated Environment, Safety and Health Management System (ISMS) Implementation Project Plan serves as the project document to guide the Fluor Hanford, Inc (FHI) and Major Subcontractor (MSC) participants through the steps necessary to complete the integration of environment, safety, and health into management and work practices at all levels.
Date:
January 10, 2000
Creator:
MITCHELL, R.L.
Object Type:
Report
System:
The UNT Digital Library
Integrated Safety Management System Phase I Verification for the Plutonium Finishing Plant (PFP) [VOL 1 & 2]
U.S. Department of Energy (DOE) Policy 450.4, Safety Management System Policy commits to institutionalizing an Integrated Safety Management System (ISMS) throughout the DOE complex as a means of accomplishing its missions safely. DOE Acquisition Regulation 970.5204-2 requires that contractors manage and perform work in accordance with a documented safety management system.
Date:
January 10, 2000
Creator:
SETH, S.S.
Object Type:
Report
System:
The UNT Digital Library
K West Basin Integrated Water Treatment System (IWTS) E-F Annular Filter Vessel Accident Calculations
Four bounding accidents postulated for the K West Basin integrated water treatment system are evaluated against applicable risk evaluation guidelines. The accidents are a spray leak during fuel retrieval, spray leak during backflushing a hydrogen explosion, and a fire breaching filter vessel and enclosure. Event trees and accident probabilities are estimated. In all cases, the unmitigated dose consequences are below the risk evaluation guidelines.
Date:
January 10, 2000
Creator:
PIEPHO, M.G.
Object Type:
Report
System:
The UNT Digital Library
KULL: LLNL's ASCI Inertial Confinement Fusion Simulation Code
KULL is a three dimensional, time dependent radiation hydrodynamics simulation code under development at Lawrence Livermore National Laboratory. A part of the U.S. Department of Energy's Accelerated Strategic Computing Initiative (ASCI), KULL's purpose is to simulate the physical processes in Inertial Confinement Fusion (ICF) targets. The National Ignition Facility, where ICF experiments will be conducted, and ASCI are part of the experimental and computational components of DOE's Stockpile Stewardship Program. This paper provides an overview of ASCI and describes KULL, its hydrodynamic simulation capability and its three methods of simulating radiative transfer. Particular emphasis is given to the parallelization techniques essential to obtain the performance required of the Stockpile Stewardship Program and to exploit the massively parallel processor machines that ASCI is procuring.
Date:
January 10, 2000
Creator:
Rathkopf, J. A.; Miller, D. S.; Owen, J. M.; Zike, M. R.; Eltgroth, P. G.; Madsen, N. K. et al.
Object Type:
Article
System:
The UNT Digital Library
Liquid and Gaseous Waste Operations Annual Operating Report CY 1999
None
Date:
January 10, 2000
Creator:
Maddox, J. J.
Object Type:
Report
System:
The UNT Digital Library
Microstructural Analyses of Topopah Spring Tuff from the Large Block Test at Fran Ridge, Nevada
Microstructural information (e.g., porosity, pore size distribution, and surface area) of porous media is critical to understanding water transport mechanisms and physical properties and their bearing on geophysical measurements. We report microstructural data obtained by mercury injection porosimetry (MIP) on 33 samples of densely welded Topopah Spring tuff from Fran Ridge, Yucca Mountain, Nevada Test Site (NTS), Nevada. The characterization of these samples is also important for the interpretation and analysis of the Large Block Test (LBT) performed in support of the Yucca Mountain Project (YMP). This report includes previously published data on samples from the same location (Roberts and Lin, 1996). We also present information from the Yucca Mountain Site Characterization Project/Lawrence Livermore National Laboratory (YMSCP/LLNL) Large Block Test Engineering Plan (Wilder, 1995) to allow correlation of our data directly to various planes within the Large Block.
Date:
January 10, 2000
Creator:
Roberts, J. J.
Object Type:
Report
System:
The UNT Digital Library
Neutron-Induced Partial Gamma-Ray Cross-Section Measurements with GEANIE at LANSCE/WNR
GEANIE is the first large-scale Ge detector array used in conjunction with a high-energy neutron spallation source. GEANIE consists of eleven Compton-suppressed planar detectors, nine suppressed and six unsuppressed co-axial detectors. Spallation neutrons are provided by the LANSCE/WNR facility, and reaction neutron energies are determined via time-of-flight. neutron flux is monitored in-beam with a fission chamber. GEANIE at LANSCE/WNR currently emphasizes the measurement of partial gamma-ray cross sections as a function of neutron energy. Absolute cross section measurements require a complete understanding of array performance. Important effects include intrinsic detector efficiency, beam and detector geometry corrections, target attenuation, and deadtime. Measurements and calculations of these effects will be presented for the specific cases of iron and actinide targets. The use of radioactive targets incurs a large deadtime penalty. In order to increase data throughput they are making plans to move to a triggerless data acquisition system. These modifications and other improvements to the electronics for better timing will be discussed.
Date:
January 10, 2000
Creator:
McNabb, D. P.; Becker, J. A.; Archer, D.; Bernstein, L. A.; Garrett, P. E.; McGrath, C. A. et al.
Object Type:
Article
System:
The UNT Digital Library
The Oklahoma Daily (Norman, Okla.), Vol. 84, No. 80, Ed. 1 Monday, January 10, 2000
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
January 10, 2000
Creator:
Wilmoth, Adam
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Optical spectroscopy of InGaN epilayers in the low indium composition regime
Photoluminescence (PL) spectroscopy was carried out on a series of Si-doped bulk InGaN films in the low indium (In) composition regime. Room temperature PL showed a factor of 25 increase in integrated intensity as the In composition was increased from 0 to 0.07. Temperature dependent PL data was fit to an Arrhenius equation to reveal an increasing activation energy for thermal quenching of the PL intensity as the In composition is increased. Time resolved PL measurements revealed that only the sample with highest In (x = 0.07) showed a strong spectral variation in decay time across the T=4K PL resonance, indicative of recombination from localized states at low temperatures. The decay times at room temperature were non-radiatively dominated for all films, and the room temperature (non-radiative) decay times increased with increasing In, from 50--230 psec for x = 0--0.07. The data demonstrate that non-radiative recombination is less effective with increasing In composition.
Date:
January 10, 2000
Creator:
Crawford, M. H.; Han, J.; Banas, M. A.; Myers, S. M., Jr.; Petersen, G. A. & Figiel, J. J.
Object Type:
Article
System:
The UNT Digital Library
Perry Daily Journal (Perry, Okla.), Vol. 107, No. 6, Ed. 1 Monday, January 10, 2000
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 10, 2000
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Prototype house provides test case for energy-efficient systems: Mitchell Homes, Pensacola, Florida; Building America Project summary fact sheet
The Carbelle prototype house is a new design produced under the U.S. Department of Energy's Building America program. Working with other members of the Consortium for Advanced Residential Buildings, Mitchell Homes developed the Carbelle as an energy-efficient upgrade to one of their standard models. By treating all design aspects of the house as a system and involving all stakeholders in the process, Mitchell expects to decrease on-site energy use for space heating and cooling by as much as 40% compared to their typical construction.
Date:
January 10, 2000
Creator:
Hendron, B.
Object Type:
Book
System:
The UNT Digital Library
PVMaT improvements in the Solarex photovoltaic module manufacturing technology: Annual subcontract report: May 5, 1998 -- April 30, 1999
This report describes work done by Solarex during the first year of this subcontract. The objective of this three-year PVMaT program is to continue the advancement of Solarex PV manufacturing technologies to design and implement a process that produces polycrystalline silicon PV modules that can be sold profitably for $2.00 per peak watt or less and that will increase the production capacity of the Frederick plant to at least 25 megawatts per year. Accomplishments during the first year of the program include: (1) Verification of the process to produce SiF{sub 4}, the precursor to silicon feedstock. (2) Design of a silicon feedstock pilot facility using the SiNaF process. (3) Development of and transfer to manufacturing of a process to use thinner wire in the wire saw. (4) Completion of a production trial with recycled SiC. (5) Laboratory development of a selective emitter process using rapid thermal processing. (6) Fabrication of high-efficiency polycrystalline cells using silicon nitride from three different sources. (7) Development of a new encapsulation formulation and laboratory demonstration of a 6-minute lamination cycle. (8) Implementation of an automated laminator. (9) Laboratory demonstration of automated handling of ceramics.
Date:
January 10, 2000
Creator:
Wohlgemuth, J.
Object Type:
Report
System:
The UNT Digital Library
RF-interrogatable hydrogel-actuated biosensor
The authors present a novel micromachined sensor that couples a swellable hydrogel with capacitive detection. The hydrogel swells in response to analyte concentration, exerting contact pressure on a deformable conducting membrane. Results are presented for characterization of a PHEMA hydrogel swelling in response to a calcium nitrate solution. Pressure-deflection measurements are performed on NiTi-based membranes. Hydrogel-actuated deflections of the membranes are measured. These measurements are correlated to determine the pressure generating characteristics of the hydrogel. Membrane deflection techniques have not previously been employed for hydrogel characterization. The PHEMA sample exhibited greatest sensitivity in the pH range of 6.0--6.5 and performed an average of 2.8 Joules of work per m{sup 3} per pH unit in response to ambient conditions over the pH range 3.5--6.5. The membrane deflections correspond to capacitive shifts of about 4 pF per pH unit for a capacitive transducer with initial gap of 100 {micro}m, capacitor plate area of 18.5 mm{sup 2} , and initial hydrogel volume of 11 {micro}L.
Date:
January 10, 2000
Creator:
Hoel, Z; Wang, A W; Darrow, C B; Lee, A P; McConaghy, C F; Krulevitch, P et al.
Object Type:
Article
System:
The UNT Digital Library
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 84, No. 101, Ed. 1 Monday, January 10, 2000
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 10, 2000
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Solid-State Modular Testing
In this note is reported the testing of the pre-production version of a solid-state adder type modulator. In this configuration, the adder consists of transformers that are driven by an array of MOSFET switches that are connected in parallel but not in series; i.e. the input voltage on the transformer is limited to the maximum voltage rating on the MOSFETs. At present, there are only enough printed circuit boards (MOSFET carrier boards) to drive four transformers and two of those are prototypes that are restricted by their gate drive circuits to a minimum output pulse width of {approx}100ns. We also have two pre-production boards that meet all of our requirements for rise and fall-times and minimum pulse width. The remainder of the production boards are due to be delivered in the first week in January and should give us full high voltage capability.
Date:
January 10, 2000
Creator:
Cook, E. G.
Object Type:
Report
System:
The UNT Digital Library
SY-101 Rapid Transfer Project Low Temperature Operations Review and Recommendations to Support Lower Temperature Limits
The lower temperature limit for the 241 SY-101 RAPID transfer project is currently set at 20 F Based on the analysis and recommendations in this document this limit can be lowered to 0 F. Analysis of all structures systems and components (SSCs) indicate that a reduction in operating temperature may be achieved with minor modifications to field-installed equipment. Following implementation of these changes it is recommended that the system requirements be amended to specify a temperature range for transfer or back dilute evolutions of 0 F to 100 F.
Date:
January 10, 2000
Creator:
Hickman, G. L.
Object Type:
Report
System:
The UNT Digital Library
System Description for Tank 241-AZ-101 Waste Retrieval Data Acquisition System
Describes the hardware and software for the AZ-101 Mixer Pump Data Acquisition System. The purpose of the tank 241-AZ-101 retrieval system Data Acquisition System (DAS) is to provide monitoring and data acquisition of key parameters in order to confirm the effectiveness of the mixer pumps utilized for suspending solids in the tank. The suspension of solids in Tank 241-AZ-101 is necessary for pretreatment of the neutralized current acid waste (NCAW), and eventual disposal as glass via the Hanford Waste Vitrification Plant.
Date:
January 10, 2000
Creator:
ROMERO, S.G.
Object Type:
Report
System:
The UNT Digital Library
Tax Credits: Characteristics of Tax Credit Properties and Their Residents
Correspondence issued by the General Accounting Office with an abstract that begins "GAO provided information on the Low-Income Housing Tax Credit program, focusing on the characteristics of tax properties and their residents."
Date:
January 10, 2000
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Users manual for the UEDGE edge-plasma transport code
Operational details are given for the two-dimensional UEDGE edge-plasma transport code. The model applies to nearly fully-ionized plasmas in a strong magnetic field. Equations are solved for the plasma density, velocity along the magnetic field, electron temperature, ion temperature, and electrostatic potential. In addition, fluid models of neutrals species are included or the option to couple to a Monte Carlo code description of the neutrals. Multi-species ion mixtures can be simulated. The physical equations are discretized by a finite-difference procedure, and the resulting system of algebraic equations are solved by fully-implicit techniques. The code can be used to follow time-dependent solutions or to find steady-state solutions by direct iteration.
Date:
January 10, 2000
Creator:
Rognlien, T. D.; Rensink, M. E. & Smith, G. R.
Object Type:
Report
System:
The UNT Digital Library