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1,376 Matching Results
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Stoichiometric changes in KH2PO4 crystals during laser-induced breakdown
The structure of KH{sub 2}PO{sub 4} single crystals (so-called KDP) irradiated with {approx} 3-ns, 355-nm laser pulses with fluences above the laser-induced breakdown threshold is studied by a combination of Raman scattering, photoluminescence, and soft x-ray absorption spectroscopies. We compare spectra from the as-grown material, surface and bulk laser-induced damage sites, as well as from KPO{sub 3} references. Results show that irradiation with fluences above the laser-induced breakdown threshold leads to stoichiometric changes at surface damage sites but not at bulk damage sites. New spectroscopic features are attributed to dehydration products. For the laser irradiation conditions used in this study, the decomposed near-surface layer absorbs photons at {approx} 3.4 eV (364 nm). These results may explain the recently reported fact that surface laser damage sites in KDP crystals tend to grow with subsequent exposure to high-power laser pulses, while bulk damage sites do not.
Date:
August 31, 2004
Creator:
Negres, R A; Kucheyev, S O; DeMange, P; Bostedt, C; van Buuren, T; Nelson, A J et al.
Object Type:
Article
System:
The UNT Digital Library
Tax Administration: IRS Needs to Consider Options for Revising Regulations to Increase the Accuracy of Social Security Numbers on Wage Statements
A letter report issued by the Government Accountability Office with an abstract that begins "Inaccurate social security numbers (SSN) on wage statements contribute to growth in the Social Security Administration's (SSA) Earnings Suspense File, increase the Internal Revenue Service's (IRS) workload to ensure that wages are properly identified for those earning them, and burden individuals who must work with SSA and IRS to resolve disputes that may affect their social security benefits and tax obligations. IRS's ability to penalize employers for submitting inaccurate SSNs on wage statements is intended to promote SSN accuracy. Items GAO was asked to describe included: (1) the statutory provisions authorizing IRS to penalize employers who file wage statements with inaccurate SSNs; (2) IRS's program to penalize such employers; and (3) the extent IRS's program meets legislative requirements, the likelihood of any penalties, and any program changes being considered."
Date:
August 31, 2004
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
TDNA Monthly Office Manager's Report: August 2004
Monthly report written by the Texas Daily Newspaper Association's (TDNA's) office manager, Darla Thompson, to Phil Berkebile providing a summary of revenues and account balances, programs, meetings, and other activities in the office during the previous month.
Date:
August 31, 2004
Creator:
Thompson, Darla
Object Type:
Report
System:
The UNT Digital Library
Texas Stonewall Democratic Caucus Reconciliation Summary
Reconciliation summary with an ending balance of $636.33 on August 31, 2004.
Date:
August 31, 2004
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
Tomographic Imaging of Upper Mantle P-wave Velocity Heterogeneity Beneath the Arabian Peninsula
None
Date:
August 31, 2004
Creator:
Park, Y; Nyblade, A & Rodgers, A
Object Type:
Report
System:
The UNT Digital Library
Union Membership Trends in the United States
None
Date:
August 31, 2004
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Users' Guide to ADIC 1.1.
This guide describes the use of the Automatic Differentiation in C (ADIC) system. ADIC is a suite of tools and libraries that automates the process of generating derivatives for scientific programs. In the context of solving PDEs, optimizations, sensitivity analysis, and inverse problems, researchers often require the derivatives {partial_derivative}f/{partial_derivative}x of a function f expressed as a program with respect to some input parameter(s) x. Automatic differentiation (AD) techniques augment the program with derivative computation by applying the chain rule of calculus to elementary operations in an automated fashion. ADIC uses sophisticated compiler techniques to augment the input C programs with derivative computation capability in an automatic fashion. It also provides a finer control of derivative code generation process via control scripts and pragmas. Another significant capability of ADIC is its component architecture, AIF, that allows ADIC's capability to be extended via plug-in modules.
Date:
August 31, 2004
Creator:
Hovland, P. D. & Norris, B.
Object Type:
Report
System:
The UNT Digital Library
Vortices, Reconnection and Turbulence in High Electron-Beta Plasmas
Plasmas in which the kinetic energy exceeds the magnetic energy by a significant factor are common in space and in the laboratory. Such plasmas can convect magnetic fields and create null points in whose vicinity first the ions become unmagnetized, then the electrons. This project focuses on the detailed study of the transition regime of these plasmas.
Date:
August 31, 2004
Creator:
Stenzel, R. L.
Object Type:
Report
System:
The UNT Digital Library