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5,489 Matching Results
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Acceleration for a High Energy Muon Collider.
None
Date:
January 5, 2000
Creator:
Berg, J. S.
Object Type:
Article
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 100, No. 249, Ed. 1 Wednesday, January 5, 2000
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 5, 2000
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Alvin Advertiser (Alvin, Tex.), Ed. 1 Wednesday, January 5, 2000
Weekly newspaper from Alvin, Texas that includes local, state, and national news along with advertising.
Date:
January 5, 2000
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Analytic crack solutions for tilt fields around hydraulic fractures
The recent development of downhole tiltmeter arrays for monitoring hydraulic fractures has provided new information on fracture growth and geometry. These downhole arrays offer the significant advantages of being close to the fracture (large signal) and being unaffected by the free surface. As with surface tiltmeter data, analysis of these measurements requires the inversion of a crack or dislocation model. To supplement the dislocation models of Davis [1983], Okada [1992] and others, this work has extended several elastic crack solutions to provide tilt calculations. The solutions include constant-pressure 2D, penny-shaped, and 3D-elliptic cracks and a 2D-variable-pressure crack. Equations are developed for an arbitrary inclined fracture in an infinite elastic space. Effects of fracture height, fracture length, fracture dip, fracture azimuth, fracture width and monitoring distance on the tilt distribution are given, as well as comparisons with the dislocation model. The results show that the tilt measurements are very sensitive to the fracture dimensions, but also that it is difficult to separate the competing effects of the various parameters.
Date:
January 5, 2000
Creator:
Warpinski, N.R.
Object Type:
Article
System:
The UNT Digital Library
Availability Analysis of the Ventilation Stack CAM Interlock System
Ventilation Stack Continuous Air Monitor (CAM) Interlock System failure modes, failure frequencies and system availability have been evaluated for the RPP. The evaluation concludes that CAM availability is as high as assumed in the safety analysis and that the current routine system surveillance is adequate to maintain this availability. Further, requiring an alarm to actuate upon CAM failure is not necessary to maintain the availability credited in the safety analysis, nor is such an arrangement predicted to significantly improve system availability. However, if CAM failures were only detected by the 92-day functional tests required in the Authorization Basis (AB), CAM availability would be much less than that credited in the safety analysis. Therefore it is recommended that the current surveillance practice of daily simple system checks, 30-day source checks and 92-day functional tests be continued in order to maintain CAM availability.
Date:
January 5, 2000
Creator:
YOUNG, J.
Object Type:
Report
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 78, No. 58, Ed. 1 Wednesday, January 5, 2000
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
January 5, 2000
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
Beam shaping element for compact fiber injection systems
Injection of high power, multi-mode laser profiles into a fiber optic delivery system requires controlling a number of injection parameters to maximize throughput and minimize concerns for optical damage both at the entrance and exit faces of the fiber optic. A simple method for simultaneously achieving a compact fiber injection geometry and control of these injection parameters, independent of the input source characteristics, is provided by a refractive lenslet array and simple injection lens configuration. Design criteria together with analytical and experimental results for the refractive lenslet array and short focal length injection lens are presented. This arrangement provides a uniform spatial intensity distribution at the fiber injection plane to a large degree independent of the source mode structure, spatial profile, divergence, size, and/or alignment to the injection system. This technique has application to a number of laser systems where uniform illumination of a target or remote delivery of high peak power is desired.
Date:
January 5, 2000
Creator:
Weichman, L.S.; Dickey, F.M. & Shagam, R.N.
Object Type:
Article
System:
The UNT Digital Library
Characterization of an energy storage capacitor in abnormal thermal environments
There are applications of high-voltage, energy-storage, capacitors where it is desirable that the energy storage capability can be reliably and predictably negated in abnormal environments such as fire. This property serves as a safety feature to prevent events of unintended consequence. The present paper describes studies of the thermal response characteristics of a cylindrically wound, discrete Mylar film/foil capacitor design. The experimental setups that simulate fires will be presented. Three different heat input geometries were employed: uniform radial input, spot radial input, and axial input. Heat input was controlled via feedback system to maintain specific temperature ramp rates. Both capacitor voltage and current were monitored during the thermal excursion to ascertain the failure temperature, i.e. when the capacitor permanently shorts. Temperature of failure data is presented for the three heat input cases along with a statistical analysis of the results and application implications. The physics of failure will be described in terms of the thermal/mechanical properties of the Mylar.
Date:
January 5, 2000
Creator:
Edwards, L. R.; Chen, K. C. & Baron, R. V.
Object Type:
Article
System:
The UNT Digital Library
The Clifton Record (Clifton, Tex.), Vol. 105, No. 1, Ed. 1 Wednesday, January 5, 2000
Semi-weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
January 5, 2000
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
Cold Vacuum Drying (CVD) Facility Acceptance for Beneficial Use
This document provides a checklist of the items required for turnover of the Cold Vacuum Drying Facility from the Construction Projects organization to the Operations organization. This document will be updated periodically to document completion of additional deliverables.
Date:
January 5, 2000
Creator:
Brisbin, S. A.
Object Type:
Report
System:
The UNT Digital Library
Durability Testing of Antireflection Coatings for Solar Applications
Antireflection (AR) coatings can be incorporated into highly transmitting glazings that, depending on their cost, performance, and durability of optical properties, can be economically viable in solar collectors, agricultural greenhouses, and PV systems. A number of AR-coated glazings have been prepared under the auspices of the International Energy Agency (IEA) Working Group on Durability of Materials for Solar Thermal Collectors. The AR coatings are of two types, including (1) various sol-gels applied to glass and (2) an embossed treatment of sheet acrylic. Typically, for unweathered glazings, a 4%--5% increase in solar-weighted transmittance has been achieved. For AR-coated glass, reflectance values as low as 0.5%--0.7% at selected wavelengths (680--720 nm) were obtained. To determine the durability of the hemispherical transmittance, several collaborating countries are testing these materials both outdoors and in accelerated weathering chambers. All materials exposed outdoors are affixed to mini-collector boxes to simulate flat-plate collector conditions. Results for candidate AR coatings weathered at geographically disperse outdoor test sites exhibit changes in spectral transmittance primarily in the high visible range (600--700 nm). Accelerated testing at measured levels of simulated solar irradiance and at different constant levels of temperature and relative humidity have been performed in different countries. Parallel testing with …
Date:
January 5, 2000
Creator:
Jorgensen, G.; Brunold, S.; Koehl, M.; Nostell, P.; Roos, A. & Oversloot, H.
Object Type:
Article
System:
The UNT Digital Library
Electron-capture delayed fission properties of neutron-deficient einsteinium nuclei
Electron-capture delayed fission (ECDF) properties of neutron-deficient einsteinium isotopes were investigated using a combination of chemical separations and on-line radiation detection methods. {sup 242}Es was produced via the {sup 233}U({sup 14}N,5n){sup 242}Es reaction at a beam energy of 87 MeV (on target) in the lab system, and was found to decay with a half-life of 11 {+-} 3 seconds. The ECDF of {sup 242}Es showed a highly asymmetric mass distribution with an average pre-neutron emission total kinetic energy (TKE) of 183 {+-} 18 MeV. The probability of delayed fission (P{sub DF}) was measured to be 0.006 {+-} 0.002. In conjunction with this experiment, the excitation functions of the {sup 233}U({sup 14}N,xn){sup 247{minus}x}Es and {sup 233}U({sup 15}N,xn){sup 248{minus}x}Es reactions were measured for {sup 243}Es, {sup 244}Es and {sup 245}Es at projectile energies between 80 MeV and 100 MeV.
Date:
January 5, 2000
Creator:
Shaughnessy, Dawn A.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Exchange bias studied with polarized neutron reflectivity
The role of Polarized Neutron Reflectivity (PNR) for studying natural and synthetic exchange biased systems is illustrated. For a partially oxidized thin film of Co, cycling of the magnetic field causes a considerable reduction of the bias, which the onset of diffuse neutron scattering shows to be due to the loosening of the ferromagnetic domains. On the other hand, PNR measurements of a model exchange bias junction consisting of an n-layered Fe/Cr antiferromagnetic (AF) superlattice coupled with an m-layered Fe/Cr ferromagnetic (F) superlattice confirm the predicted collinear magnetization in the two superlattices. The two magnetized states of the F (along or opposite to the bias field) differ only in the relative orientation of the F and adjacent AF layer. The possibility of reading clearly the magnetic state at the interface pinpoints the commanding role that PNR is having in solving this intriguing problem.
Date:
January 5, 2000
Creator:
te Velthuis, S. G. E.
Object Type:
Article
System:
The UNT Digital Library
Experimental Investigation of Short Scalelength Density Fluctuations in Laser-Produced Plasmas
The technique of near forward laser scattering is used to infer characteristics of intrinsic and controlled density fluctuations in laser-produced plasmas. Intrinsic fluctuations are studied in long-scale length plasmas where we find that the fluctuations exhibit scale sizes related to the intensity variation scales in the plasma-forming and interaction beams. Stimulated Brillouin forward scattering and filamentation appear to be the primary mechanism through which these fluctuations originate. The beam spray resulting from these fluctuations is important to understand since it can affect symmetry in an inertial confinement fusion (ICF) experiment. Controlled fluctuations are studied in foam and exploding foil targets. Forward scattered light from foam targets shows evidence that the initial target inhomogeneities remain after the target is laser heated. Forward scattered light from an exploding foil plasma shows that a regular intensity pattern can be used to produce a spatially correlated density fluctuation pattern. These results provide data which are being used to benchmark numerical models of beam spray.
Date:
January 5, 2000
Creator:
Moody, J. D.; MacGowan, B. J.; Glenzer, S. H.; Kirkwood, R. K.; Kruer, W. L.; Montgomery, D. S. et al.
Object Type:
Article
System:
The UNT Digital Library
The Express-Star (Chickasha, Okla.), Ed. 1 Wednesday, January 5, 2000
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 5, 2000
Creator:
Bush, Kent
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Fabrication of Photonic band gap Materials
A method for forming a periodic dielectric structure exhibiting photonic band gap effects includes forming a slurry of a nano-crystalline ceramic dielectric or semiconductor material and monodisperse polymer microsphere, depositing a film of the slurry on a substrate, drying the film, and calcining the film to remove the polymer microsphere there from. The film may be cold-pressed after drying and prior to calcining. The ceramic dielectric or semiconductor material may be titania, and the polymer microsphere may be polystyrenemicrosphere.
Date:
January 5, 2000
Creator:
Constant, Kristen; Subramania, Ganapathi S.; Biswas, Rana & Ho, Kai-Ming
Object Type:
Patent
System:
The UNT Digital Library
Final report DOE Grant No. DE-FG08-91ER20049 [The role of alternative (cyanide-insensitive) respiration in plants]
None
Date:
January 5, 2000
Creator:
Raskin, Ilya
Object Type:
Report
System:
The UNT Digital Library
Illustrated Paperboy (Cleveland, Tex.), Vol. 7, No. 41, Ed. 1 Wednesday, January 5, 2000
Weekly newspaper from Cleveland, Texas that includes local, county, and state news along with extensive advertising.
Date:
January 5, 2000
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Large Scale Isosurface Bicubic Subdivision-Surface Wavelets for Representation and Visualization
We introduce a new subdivision-surface wavelet transform for arbitrary two-manifolds with boundary that is the first to use simple lifting-style filtering operations with bicubic precision. We also describe a conversion process for re-mapping large-scale isosurfaces to have subdivision connectivity and fair parameterizations so that the new wavelet transform can be used for compression and visualization. The main idea enabling our wavelet transform is the circular symmetrization of the filters in irregular neighborhoods, which replaces the traditional separation of filters into two 1-D passes. Our wavelet transform uses polygonal base meshes to represent surface topology, from which a Catmull-Clark-style subdivision hierarchy is generated. The details between these levels of resolution are quickly computed and compactly stored as wavelet coefficients. The isosurface conversion process begins with a contour triangulation computed using conventional techniques, which we subsequently simplify with a variant edge-collapse procedure, followed by an edge-removal process. This provides a coarse initial base mesh, which is subsequently refined, relaxed and attracted in phases to converge to the contour. The conversion is designed to produce smooth, untangled and minimally-skewed parameterizations, which improves the subsequent compression after applying the transform. We have demonstrated our conversion and transform for an isosurface obtained from a high-resolution …
Date:
January 5, 2000
Creator:
Bertram, M.; Duchaineau, M.A.; Hamann, B. & Joy, K.I.
Object Type:
Article
System:
The UNT Digital Library
Laser Ultrasonic Furnace Tube Coke Monitor. Quarterly technical progress report. Report no. 6 for reporting period August 1, 1999 through November 1, 1999
The test results suggest that the signal sensitivity is related to the difference between the operating temperature of the furnace tube and the melting temperature of the sacrificial stand-off. This may be due to the effect of melt viscosity on the pooling of the molten metal under the stand-off or it may be due to the rate of melting of the stand-off. Further high-temperature investigations are underway to elucidate these issues.
Date:
January 5, 2000
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Levelland and Hockley County News-Press (Levelland, Tex.), Vol. 21, No. 80, Ed. 1 Wednesday, January 5, 2000
Semiweekly newspaper from Levelland, Texas that includes local, state, and national news along with advertising.
Date:
January 5, 2000
Creator:
Rigg, John
Object Type:
Newspaper
System:
The Portal to Texas History
Mack LNG vehicle development
The goal of this project was to install a production-ready, state-of-the-art engine control system on the Mack E7G natural gas engine to improve efficiency and lower exhaust emissions. In addition, the power rating was increased from 300 brake horsepower (bhp) to 325 bhp. The emissions targets were oxides of nitrogen plus nonmethane hydrocarbons of less than 2.5 g/bhp-hr and particulate matter of less than 0.05 g/bhp-hr on 99% methane. Vehicle durability and field testing were also conducted. Further development of this engine should include efficiency improvements and oxides of nitrogen reductions.
Date:
January 5, 2000
Creator:
Southwest Research Institute
Object Type:
Report
System:
The UNT Digital Library
Mannford Eagle (Mannford, Okla.), Vol. 18, No. 45, Ed. 1 Wednesday, January 5, 2000
Weekly newspaper from Mannford, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 5, 2000
Creator:
Retherford, Bill R.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Mannford Star (Mannford, Okla.), Vol. 6, No. 18, Ed. 1 Wednesday, January 5, 2000
Weekly newspaper from Mannford, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 5, 2000
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History