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Jim Argo Collection
302
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11
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11
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Results:
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Measurement of the angular distribution of electrons from W {right arrow} e{nu} decays observed in p pbar collisions at {squareroot}s = 1.8 TeV
We present a preliminary measurement of the electron angular distribution parameter {alpha}<sub>2</sub> in W {yields} e{nu} events using data collected by the D0 detector during the 1994-1995 Tevatron run. We compare our results with next-to- leading order perturbative QCD, which predicts an angular distribution of (1±{alpha}<sub>1</sub> cos{theta}* +{alpha}<sub>2</sub> cos²{theta}*), where {theta}* is the angle between the charged lepton and the antiproton in the Collins-Soper frame. In the presence of QCD corrections, the parameters {alpha}<sub>1</sub> and {alpha}<sub>2</sub> become functions of p<sup>W</sup><sub>T</sub> , the W boson transverse momentum. We present the first measurement of {alpha}<sub>2</sub> as a function of p<sup>W</sup><sub>T</sub>. This measurement is of importance, because it provides a test of next-to-leading order QCD corrections which are a non-negligible contribution to the W mass measurement.
Date:
July 26, 1999
Creator:
Abbott, B.
Object Type:
Article
System:
The UNT Digital Library
Final report: Efficient thyratron modulator project
The purpose of this program was to examine methods of increasing the efficiency of producing pulses to drive Klystrons in the 150 MW range. This may include 2 Klystrons in the 75 MW range. Specific methods of interest to improve the pulse efficiency were the use of a circuit to add energy to the tail of the pulse, the use of a bipyrimidal transformer, and the use of gas insulation as a means of improving the pulse shape. These methods were investigated using both thyratron and IGBT switching. The low cost designs developed in this work consisted of low voltage designs which don't require the oil immersion. These designs can be ''hot tuned'' based on the use of simple, tunable inductors.
Date:
November 26, 1999
Creator:
Adler, R. J.; Richter-Sand, R. J. & Gregg, C. W.
Object Type:
Report
System:
The UNT Digital Library
Caribbean Basin Enhancement Legislation
Legislation provides Caribbean countries similar tariff benefits as Mexico under the Caribbean and Central American Relief and Economic Stabilization Act. A senate bill provides relief to the hurricane affected countries of Central America. The senate bill is more restrictive than the House bill in the scope of tariff benefits offered.
Date:
March 26, 1999
Creator:
Ahearn, Raymond
Object Type:
Report
System:
The UNT Digital Library
Characterizing Composition Modulations in InAs/AIAs Short-Period Superlattices
The formation of quantum wires has much interest due to their novel electronic properties which may lead to enhanced optoelectronic device performance and greater photovoltaic efficiencies. One method of forming these structures is through spontaneous lateral modulation found during the epitaxial growth of III/V alloys. In this paper, we report and summarize our investigations on the formation of lateral moduation in the MBE grown InAlAs/InP(001) system. This system was grown as a short-period superlattice where n-monolayers of InAs are deposited followed by m-Monolayers of AlAs (with n and m~2) and this sequence is repeated to grown a low strain InAlAs ternary alloy on InP(001) that exhibits lateral modulation. Films were grown under a variety of condition (growth temperature, effective alloy composition, superlattice period, and growth rate). These films have been extensively analyzed using X-ray diffraction, atomic force microscopy, and transmission electron microscopy (TEM) and microcharacterization, in addition to photon-based spectroscopes. Here we present results of several microstructural characterizations using a wide range of TEM-based techniques, and compare them to results from the other methods to obtain a unified understanding of composition modulation. Two strong points consistently emerge: 1) The lateral modulation wavelength is insensitive to growth temperature and effective alloy …
Date:
April 26, 1999
Creator:
Ahrenkiel, S. P.; Follstaedt, D. M.; Jones, E. D.; Lee, S. R.; Mascarenhas, A.; Mirecki-Millunchick, J. et al.
Object Type:
Article
System:
The UNT Digital Library
Subsurface imaging using the spectral polarization difference technique and NIR illumination
A subsurface imaging system is utilized to test the ability of the spectral polarization difference imaging technique for deep subsurface imaging in tissues. The illumination of the system is derived from compact class III lasers in the red and NIR spectral region and, alternatively, from a white light source and selection of the appropriate illumination wavelength using band-pass optical filters. The experimental results demonstrate detection and imaging of a high-scattering object located up to 1.5 cm underneath the surface of a host chicken tissue.
Date:
January 26, 1999
Creator:
Alfano, R R; Demos, S G & Radousky, H B
Object Type:
Article
System:
The UNT Digital Library
Beam Tilt and Angular Dispersion in Broad-Bandwidth, Nanosecond Optical Parametric Oscillators
We show that the signal and idler beams generated by certain types of unseeded, nanosecond optical parametric oscillators are tilted and angularly dispersed and have anomalously large bandwidths. This effect is demonstrated in both laboratory measurements and a numerical model. We show how the optical cavity design influences the tilts and how they can be eliminated or minimized. We also determine the conditions necessary to injection seed these parametric oscillators.
Date:
January 26, 1999
Creator:
Alford, W. J.; Arisholm, G.; Gehr, R. J.; Schmitt, R. L. & A.V., Smith.
Object Type:
Article
System:
The UNT Digital Library
The Oklahoma Daily (Norman, Okla.), Vol. 83, No. 91, Ed. 1 Tuesday, January 26, 1999
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
January 26, 1999
Creator:
Allam, Heather
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Oklahoma Daily (Norman, Okla.), Vol. 83, No. 114, Ed. 1 Friday, February 26, 1999
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
February 26, 1999
Creator:
Allam, Heather
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Oklahoma Daily (Norman, Okla.), Vol. 83, No. 127, Ed. 1 Friday, March 26, 1999
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
March 26, 1999
Creator:
Allam, Heather
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Oklahoma Daily (Norman, Okla.), Vol. 83, No. 150, Ed. 1 Monday, April 26, 1999
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
April 26, 1999
Creator:
Allam, Heather
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Development of Characterization Tools for Reliability Testing of MicroElectroMechanical System Actuators
Characterization tools have been developed to study the performance characteristics and reliability of surface micromachined actuators. These tools include (1) the ability to electrically stimulate or stress the actuator, (2) the capability to visually inspect the devices in operation, (3) a method for capturing operational information, and (4) a method to extract performance characteristics from the operational information. Additionally, a novel test structure has been developed to measure electrostatic forces developed by a comb drive actuator.
Date:
July 26, 1999
Creator:
Allen, James J.; Eaton, William P.; Smith, Norman F. & Tanner, Danelle M.
Object Type:
Article
System:
The UNT Digital Library
Novel InGaAsN pn Junction for High-Efficiency Multiple-Junction Solar Cells
We report the application of a novel material, InGaAsN, with bandgap energy of 1.05 eV as a junction in an InGaP/GaAs/InGaAsN/Ge 4-junction design. Results of the growth and structural, optical, and electrical properties were demonstrated, showing the promising perspective of this material for ultra high efficiency solar cells. Photovoltaic properties of an as-grown pn diode structure and improvement through post growth annealing were also discussed.
Date:
March 26, 1999
Creator:
Allerman, A. A.; Chang, P. C.; Gee, J. M.; Hammons, B. E.; Hou, H. Q.; Jones, E. D. et al.
Object Type:
Article
System:
The UNT Digital Library
Flux effects on defect production and damage accumulation in cu and fe exposed to IFE-like conditions
Radiation damage production and accumulation in solids can be divided into two stages. In the production stage, the impinging particle gradually gives off its kinetic energy to lattice atoms in the form of energetic recoils. These deposit their energy by generating secondary and higher order recoils that result in a displacement collision cascade. The outcome of this stage, of the time scale of a few to 100 picoseconds, is a population of point or clustered defects known as the primary state of damage. In the second stage, which can extend over seconds, defects that survive recombination within their nascent cascade migrate over long distances, interacting with the microstructure. These freely migrating defects (FMD) are responsible for the changes in the macroscopic properties of metals under irradiation, such as void swelling, embrittlement, radiation enhanced diffusion, etc. Such changes in mechanical properties are most often detrimental and severely limit the flexibility in materials choice and operating temperature when designing a fusion power plant. Under most conditions, such as those that would be present in a magnetic fusion energy plant, or when bombarding with fission or spallation neutrons, irradiation takes place at a certain dose rate and temperature, but in a continuous manner. …
Date:
August 26, 1999
Creator:
Alonso, E. A.; Caturla, M. J.; Diaz de la Rubia, T.; Perlado, J. M. & Stoller, R. E.
Object Type:
Article
System:
The UNT Digital Library
Andy Payne Statue
Photograph of the Andy Payne statue, off Route 66.
Date:
July 26, 1999
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Andy Payne Statue
Photograph of the Andy Payne statue, off Route 66.
Date:
July 26, 1999
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Andy Payne Statue
Photograph of the Andy Payne statue, off Route 66.
Date:
July 26, 1999
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Art Deco Building
Photograph of the exterior of a historic Art Deco Building.
Date:
July 26, 1999
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Art Deco Building
Photograph of the exterior of a historic Art Deco Building.
Date:
July 26, 1999
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Art Deco Building
Photograph of the exterior of a historic Art Deco Building.
Date:
July 26, 1999
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Art Deco Building
Photograph of the exterior of a historic Art Deco Building.
Date:
July 26, 1999
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Art Deco Building
Photograph of the exterior of a historic Art Deco Building.
Date:
July 26, 1999
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Art Deco Building
Photograph of the exterior of a historic Art Deco Building.
Date:
July 26, 1999
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Art Deco Building
Photograph of the exterior of a historic Art Deco Building.
Date:
July 26, 1999
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Art Deco Building
Photograph of the exterior of a historic Art Deco Building.
Date:
July 26, 1999
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History