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Frequency Doubling Broadband Light in Multiple Crystals
The authors compare frequency doubling of broadband light in a single nonlinear crystal with doubling in five crystals with intercrystal temporal walk off compensation, and with doubling in five crystals adjusted for offset phase matching frequencies. Using a plane-wave, dispersive numerical model of frequency doubling they study the bandwidth of the second harmonic and the conversion efficiency as functions of crystal length and fundamental irradiance. For low irradiance the offset phase matching arrangement has lower efficiency than a single crystal of the same total length but gives a broader second harmonic bandwidth. The walk off compensated arrangement gives both higher conversion efficiency and broader bandwidth than a single crystal. At high irradiance, both multicrystal arrangements improve on the single crystal efficiency while maintaining broad bandwidth.
Date:
July 26, 2000
Creator:
ALFORD,WILLIAM J. & SMITH,ARLEE V.
Object Type:
Article
System:
The UNT Digital Library
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
Simulation of the Future LSST Data Pipelines
In this paper we describe our approach to build a pipeline simulator for the future Large-scale Synoptic Survey Telescope (LSST). The simulated pipeline will be used to research and evaluate software architectures that are efficient and flexible. It will also be used to define the real-time software and hardware requirements needed to support the anticipated LSST data rates. The LSST data pipeline requirements are still being defined, however, previous surveys can provide a good source for data requirements. Our approach is to use the SuperMacho data pipeline as a prototyping tool to identify a framework for building Modular Data-Centric Pipeline (MDCP) architectures. The prototyping is done in a hierarchical fashion to help capture and define the general data attributes (schema) first. We then model other necessary components based on science and performance requirements. We use identified schemas or data attributes as a way to define a data model for LSST.
Date:
July 26, 2004
Creator:
Abdulla, Ghaleb M.
Object Type:
Article
System:
The UNT Digital Library
Interface Characterization Techniques for 304L Stainless Steel Resistance Upset Welds
In an effort to better characterize and classify austenitic stainless steel resistance upset welds, standard methods have been examined and alternative methods investigated. Optical microscopy yields subjective classification due to deformation obscured bond lines and individual perception. The use of specimen preparations that better reveal grain boundaries aids in substantiating optical information. Electron microscopy techniques produce quantitative information in relation to microstructural constituents. Orientation Imaging Microscopy (OIM) is a relatively new technique for obtaining objective, quantitative information pertaining to weld integrity, i.e., percent grain boundary growth across the interface.
Date:
July 26, 1998
Creator:
Abeln, Terri G.; Kackenko, E. Jim; Necker, Carl T. & Field, Robert D.
Object Type:
Article
System:
The UNT Digital Library
Public Aid to Church Related Colleges: An Analysis of Roemer v. Board of Public Works of Maryland
This report is on Public Aid to Church-Related Colleges: An Analysis of Roemer v. Board of Public Works of Maryland. This report will summarize the Roemer case and analyze its constitutional implications.
Date:
July 26, 1976
Creator:
Ackerman, David M.
Object Type:
Report
System:
The UNT Digital Library
A New Dynamical Diffraction-Based Technique of the Residual Stress Measurements in Thin Films
The recently discovered dynamical diffraction effect ''neutron camel'' was used for the residual stress measurements in a thick Si(111) crystal coated with a 2000 {angstrom} thick Ni film. The observed asymmetry of the back-face rocking curve corresponds to the bending radius of {approx} 19 km and the tension force applied to the Ni film is {approx} 90 N/m. Relative deformation of the Si crystallographic cells in the vicinity of diffractive surfaces is |{partial_derivative}u{sub z}/{partial_derivative}z| {approx} 1.6 x 10{sup -6}.
Date:
July 26, 2001
Creator:
Agamalian, M.
Object Type:
Article
System:
The UNT Digital Library
European Trade Retaliation: The FSC-ETI Case
None
Date:
July 26, 2006
Creator:
Aheam, Raymond J.
Object Type:
Report
System:
The UNT Digital Library
Trade Conflict and the U.S.-European Union Economic Relationship
The United States and the European Union (EU) share a huge, dynamic, and mutually beneficial economic partnership. Not only is the U.S.-EU trade and investment relationship the largest in the world, but it is also arguably the most important. Agreement between the two partners in the past has been critical to making the world trading system more open and efficient.
Date:
July 26, 2006
Creator:
Ahearn, Raymond J.
Object Type:
Report
System:
The UNT Digital Library
X-ray Diffraction Diagnostic Design for the National Ignition Facility
None
Date:
July 26, 2013
Creator:
Ahmed, M; House, A; Smith, R F; Lamb, Z & Swift, D W
Object Type:
Article
System:
The UNT Digital Library
Leveling Instrument
Patent for leveling instrument. Illustration included.
Date:
July 26, 1904
Creator:
Akins, Henry King
Object Type:
Patent
System:
The Portal to Texas History
Development of advanced technologies for photochemical tritium recovery. Bi-quarterly progress report, January 1, 1982-June 30, 1982
Mixtures of CTCl/sub 3//CDCl/sub 3/ were successfully detritiated by 12..mu.. laser multiple-photon dissociation. The lower limit of the T/D enrichment factor was determined to be approx. 165. Additional studies concerning the effects of pulse energy, irradiation geometry and sample pressure were conducted. Characterization of both untuned and tuned NH/sub 3/ laser configurations were completed. Further laser studies considered implementation of a short pulse CO/sub 2/ laser pump source for either the current NH/sub 3/ laser or for possible use in a rotational Raman laser. Process engineering requirements for T/D separation at Savannah River were studied in detail and the first complete process design for implementation is presented.
Date:
July 26, 1982
Creator:
Aldridge, F. T.; Herman, I. P.; Magnotta, F.; Maienschein, J. L.; Marling, J. B. & Young, R. H.
Object Type:
Report
System:
The UNT Digital Library
Metal Hydrides Final Report
None
Date:
July 26, 1943
Creator:
Alexander, P. P.
Object Type:
Report
System:
The UNT Digital Library
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
Measurements of the Nucleon Form-Factors at Large Momentum Transfers
New measurements of the electric GE(Q2) and magnetic GM(Q2) form factors of the nucleons are reported. The proton data cover the Q2 range from 1.75 to 8.83 (GeV/c)2 and the neutron data from 1.75 to 4.00 (GeV/c)2, more than doubling the range of previous data. Scaled by the dipole fit, GD(Q2), the results forGMp(Q2) /¿pGD(Q2) decrease smoothly from 1.05 to 0.92, while GEp(Q2)/GD(Q2)is consistent with unity. The preliminary results for GMn(Q2) /¿nGD(Q2) are consistent with unity, while GEn is consistent with zero at all values of Q2.
Date:
July 26, 1992
Creator:
Andivahis, L; Bosted, Peter; Lung, Allison; Stuart, Linda; Alster, Jonas; Arnold, Raymond et al.
Object Type:
Article
System:
The UNT Digital Library
Midterm Progress Report for TORUS Topical Collaboration in Nuclear Theory
None
Date:
July 26, 2012
Creator:
Arbanas, G.; Elster, C.; Escher, J.; Mukhamedzhanov, A.; Nunes, F. & Thompson, I. J.
Object Type:
Report
System:
The UNT Digital Library
Guinea: Background and Relations with the United States
This report gives an overview of Guinea and discusses the background information and relations with the United States
Date:
July 26, 2011
Creator:
Arieff, Alexis
Object Type:
Report
System:
The UNT Digital Library
Status of the Nif Power Conditioning System
The NIF Power Conditioning System provides the pulsed excitation required to drive flashlamps in the laser's optical amplifiers. Modular in design, each of the 192 Main Energy Storage Modules (MESMs) storage up to 2.2 MJ of electrical energy in its capacitor bank before delivering the energy to 20 pairs of flashlamps in a 400 {micro}s pulse (10% power points). The peak current of each MESM discharge is 0.5 MA. Production, installation, commissioning and operation of the NIF Power Conditioning continue to progress rapidly, with the goals of completing accelerated production in late 2007 and finishing commissioning by early 2008, all the while maintaining an aggressive operations schedule. To date, more than 80% of the required modules have been assembled, shipped and installed in the facility, representing more that 240 MJ of stored energy available for driving NIF flashlamps. The MESMs have displayed outstanding reliability during daily, multiple-shift operations.
Date:
July 26, 2007
Creator:
Arnold, P.; Hulsey, S.; Ullery, G.; Petersen, D.; Pendleton, D.; Ollis, C. et al.
Object Type:
Article
System:
The UNT Digital Library
Environmental Monitoring at the Savannah River Plant, Annual Report - 1973
This report summarizes results obtained from the environmental monitoring program at the Savannah River Plant during 1973. A brief discussion of plant releases to the environment and radioactivity detected in the environment is presented in the text and tables. The appendix contains tables of results from environmental sample analyses, sensitivities of laboratory analyses, and maps of sampling locations.
Date:
July 26, 2001
Creator:
Ashley, C.
Object Type:
Report
System:
The UNT Digital Library
Environmental Monitoring at the Savannah River Plant, Annual Report - 1981
An environmental monitoring program has been in existence at SRP since 1951. The original preoperational surveys have evolved into an extensive environmental monitoring program in which sample types from approximately 500 locations are analyzed for radiological and/or nonradiological parameters. The results of these analyses for 1981 are presented in this report.
Date:
July 26, 2001
Creator:
Ashley, C.
Object Type:
Report
System:
The UNT Digital Library
Time resolved x-ray pinhole photography of compressed laser fusion targets
Use of the Livermore x-ray streak camera to temporally record x-ray pinhole images of laser compressed targets is described. Use is made of specially fabricated composite x-ray pinholes which are near diffraction limited for 6 A x-rays, but easily aligned with a He--Ne laser of 6328 A wavelength. With a 6 ..mu..m x-ray pinhole, the overall system can be aligned to 5 ..mu..m accuracy and provides implosion characteristics with space--time resolutions of approximately 6 ..mu..m and 15 psec. Acceptable criteria for pinhole alignment, requisite x-ray flux, and filter characteristics are discussed. Implosion characteristics are presented from our present experiments with 68 ..mu..m diameter glass microshell targets and 0.45 terawatt, 70 psec Nd laser pulses. Final implosion velocities in excess of 3 x 10/sup 7/ cm/sec are evident.
Date:
July 26, 1976
Creator:
Attwood, D. T.
Object Type:
Article
System:
The UNT Digital Library
Hough Transform Based Corner Detection for Laser Beam Positioning
In laser beam alignment in addition to detecting position, one must also determine the rotation of the beam. This is essential when a commissioning new laser beam for National Ignition Facility located at the Lawrence Livermore National Laboratory. When the beam is square, the positions of the corners with respect to one another provides an estimate of the rotation of the beam. This work demonstrates corner detection in the presence or absence of a second order non-uniform illumination caused by a spatial mask. The Hough transform coupled with illumination dependent pre-processing is used to determine the corner points. We show examples from simulated and real NIF images.
Date:
July 26, 2005
Creator:
Awwal, A. S.
Object Type:
Article
System:
The UNT Digital Library
Machine for Pressing Shingles and Slabs and The Like
Patent for a machine designed for manufacturing shingles and other building material. Illustrations included.
Date:
July 26, 1910
Creator:
Baade, John
Object Type:
Patent
System:
The Portal to Texas History
The Formation of Protons From Water by Electron Impact
The relative cross section for the production of protons from water by electron bombardment was measured by a modulated crossed beam technique over an energy range from threshold to 500 ev. The appearance potential for protons was measured by comparison with the ionization potential of hydrogen and found to be 19.4 ev. This result is in agreement with earlier results. The overall curve is smooth with the exception of a slight shoulder at about 45 ev. This shoulder may indicate the presence of more than one process for the formation of protons. (auth)
Date:
July 26, 1962
Creator:
Baker, F. S. & Brink, G. O.
Object Type:
Report
System:
The UNT Digital Library
Automobile and Light Truck Fuel Economy: Is CAFE Up to Standards?
One of the least controversial provisions of the Energy Policy and Conservation Act of 1975 (P.L. 94-163) established corporate average fuel economy (CAFE) standards for new passenger cars. This report presents a brief background and analysis regarding the price of crude oil that brought into sharp focus the fuel inefficiency of U.S. automobiles. The report also discusses the previous issues and the most recent developments regarding CAFE.
Date:
July 26, 2002
Creator:
Bamberger, Robert L.
Object Type:
Report
System:
The UNT Digital Library