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Detection and Tracking of the Back-Reflection of KDP Images in the Presence or Absence of a Phase Mask
The KDP crystals present in the final optics assembly at the National Ignition Facility (NIF) are used for conversion of infrared laser light beam into ultraviolet. The conversion is highest for a certain incident angle, the alignment of which is determined from the position of the back reflection beam, which exhibits a distinct characteristics shape. When a phase plate device is introduced before the final assembly to increase the uniformity of the beam, the back reflection pattern changes drastically. The algorithm which is best for tracking the special shaped beam is no longer suitable to track the phase modified beam. The work presented here discusses our detection schemes for both the situations. In particular, we demonstrate how the algorithm senses the modified beam using a newly proposed criterion of ''correlation peak pedestal area'' and execute an alternate algorithm in real time without operator intervention. This new algorithm continuously tracks the beam pattern to guarantee reliable and repeatable sensing. Results from simulation and real world implementation of the algorithm at the NIF facility are presented.
Date:
March 4, 2005
Creator:
Awwal, A.; McClay, W. A.; Ferguson, S. W.; Candy, J. V.; Salmon, J. T. & Wegner, P. J.
Object Type:
Article
System:
The UNT Digital Library
Development of Solid State NMR Methods for the Structural Characterization of Membrane Proteins: Applications to Understand Multiple Sclerosis
Multiple sclerosis (MS) is a relapsing-remitting disorder of the central nervous system that results in the loss of the myelin sheaths insulating nerve fibers (axons). Strong evidence suggests that MS is an autoimmune disease mediated by T-cell and antibody responses against myelin antigens. Myelin oligodendrocyte glycoprotein (MOG) is a 26 kD to 28 kD an integral membrane protein of the central nervous system implicated as a target for autoaggressive antibodies in MS. To date, the conformation of MOG in association with the myelin membrane is unknown and the exact nature of the interactions between this protein and disease-inducing immune responses have not been determined. Since membrane associated proteins are typically characterized by decreased correlation times, solution state NMR methodologies are often impracticable. Membrane proteins are also often difficult to crystallize for X-ray diffraction studies, Consequently, there is an urgent need to develop new structure characterization tools for this important class of biomolecules. The research described here overviews the initial stages of our effort to develop an integrated, NMR based approach to structural studies of MOG over the many structural domains it is postulated to posses. The structural knowledge gained about this important MS antigen in its native environment will contribute …
Date:
March 4, 2003
Creator:
Cosman, M; Tran, A T; Ulloa, J & Maxwell, R S
Object Type:
Report
System:
The UNT Digital Library
Dike Propagation Near Drifts
The purpose of this Analysis and Model Report (AMR) supporting the Site Recommendation/License Application (SR/LA) for the Yucca Mountain Project is the development of elementary analyses of the interactions of a hypothetical dike with a repository drift (i.e., tunnel) and with the drift contents at the potential Yucca Mountain repository. This effort is intended to support the analysis of disruptive events for Total System Performance Assessment (TSPA). This AMR supports the Process Model Report (PMR) on disruptive events (CRWMS M&O 2000a). This purpose is documented in the development plan (DP) ''Coordinate Modeling of Dike Propagation Near Drifts Consequences for TSPA-SR/LA'' (CRWMS M&O 2000b). Evaluation of that Development Plan and the work to be conducted to prepare Interim Change Notice (ICN) 1 of this report, which now includes the design option of ''Open'' drifts, indicated that no revision to that DP was needed. These analyses are intended to provide reasonable bounds for a number of expected effects: (1) Temperature changes to the waste package from exposure to magma; (2) The gas flow available to degrade waste containers during the intrusion; (3) Movement of the waste package as it is displaced by the gas, pyroclasts and magma from the intruding dike (the …
Date:
March 4, 2002
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Distribution of Child Support Collections
This report discusses child support distribution policy. The general rules in effect as of October 1, 2000 are that child support collected during the time a family receives cash welfare belongs to the state; current child support and arrearages (past-due payments) that are owed to a family that is no longer receiving welfare belongs to the family; and child support owed to a family that never received welfare belongs to the family.
Date:
March 4, 2003
Creator:
Solomon-Fears, Carmen
Object Type:
Report
System:
The UNT Digital Library
Drug Trafficking and North Korea: Issues for U.S. Policy
At least 50 documented incidents in more than 20 countries around the world, many involving arrest or detention of North Korean diplomats, link North Korea to drug trafficking. Such events, in the context of credible, but unproven, allegations of large scale state sponsorship of drug production and trafficking, raise important issues for the United States and its allies in combating international drug trafficking. The challenge to policy makers is how to pursue an effective counter drug policy and comply with U.S. law which may require cutting off aid to North Korea while pursuing other high-priority U.S. foreign policy objectives including (1) limiting possession and production of weapons of mass destruction; (2) limiting ballistic missile production and export; (3) curbing terrorism, counterfeiting, and international crime; and (4) addressing humanitarian needs.
Date:
March 4, 2005
Creator:
Perl, Raphael F.
Object Type:
Report
System:
The UNT Digital Library
The Dublin Citizen (Dublin, Tex.), Vol. 14, No. 27, Ed. 1 Thursday, March 4, 2004
Weekly newspaper from Dublin, Texas that includes local, state, and national news along with advertising.
Date:
March 4, 2004
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
[Duo Dancing]
Photograph taken of a duo performing at the Weekend Festival of Black Dance: Rhythm and Soul of a People sponsored by The Black Academy of Arts and Letters in Dallas, Texas.
Date:
[2005-03-04..2005-03-05]
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
[Duo dancing]
Photograph taken of a duet between two dancers at the Weekend Festival of Black Dance: Rhythm and Soul of a People sponsored by The Black Academy of Arts and Letters in Dallas, Texas.
Date:
[2005-03-04..2005-03-05]
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
[Duo Dancing]
Photograph taken of two dancers performing together at the Weekend Festival of Black Dance: Rhythm and Soul of a People sponsored by The Black Academy of Arts and Letters in Dallas, Texas.
Date:
[2005-03-04..2005-03-05]
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
[Duo dancing]
Photograph taken of a pair of dancers performing at the Weekend Festival of Black Dance: Rhythm and Soul of a People sponsored by The Black Academy of Arts and Letters in Dallas, Texas.
Date:
[2005-03-04..2005-03-05]
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
[Duo performing]
Photograph taken of a pair of dancers performing at the Weekend Festival of Black Dance: Rhythm and Soul of a People sponsored by The Black Academy of Arts and Letters in Dallas, Texas.
Date:
[2005-03-04..2005-03-05]
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
Early universe cosmology and tests of fundamental physics
This is the report of the Working Group on Early Universe Cosmology and tests of Fundamental Physics, group P4.8 of the of the Snowmass 2001 conference. Here we summarize the impressive array of advances that have taken place in this field, and identify opportunities for even greater progress in the future. Topics include Dark Energy, Cosmic Acceleration, Inflation, Phase Transitions, Baryogenesis, and String/M-theory Cosmology. The introductory section gives an executive summary with six key open questions on which we can expect to make significant progress.
Date:
March 4, 2002
Creator:
Andreas Albrecht, Joshua A. Frieman and Mark Trodden
Object Type:
Article
System:
The UNT Digital Library
The Economic Effects of Capital Gains Taxation
This report discusses tax policy in relation to capital gains. Proposals dealing with the taxation of capital gains have ranged from the outright elimination of capital gains taxation to the reduction of capital gains tax rates for certain classes of taxpayers to the elimination of the preferential tax treatment.
Date:
March 4, 2009
Creator:
Hungerford, Thomas L.
Object Type:
Report
System:
The UNT Digital Library
EFFECTS OF FAULT DISPLACEMENT ON EMPLACEMENT DRIFTS
None
Date:
March 4, 2002
Creator:
NA
Object Type:
Report
System:
The UNT Digital Library
Effects of Tritium in Elastomers
A number of elastomers, used as flange gaskets in the piping system of the Savannah River Plant tritium facilities, are being examined to identify those compounds more radiation-resistant that the currently specified Buna-N rubber and to study the mechanism of tritium radiation damage. This paper discusses this study.
Date:
March 4, 2003
Creator:
Zapp, P.E.
Object Type:
Article
System:
The UNT Digital Library
Electra Star-News (Electra, Tex.), Vol. 98, No. 34, Ed. 1 Thursday, March 4, 2004
Weekly newspaper from Electra, Texas that includes local, state, and national news along with advertising.
Date:
March 4, 2004
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Electrical Safety and Arc Flash Protections
Over the past four years, the Electrical Safety Program at PPPL has evolved in addressing changing regulatory requirements and lessons learned from accident events, particularly in regards to arc flash hazards and implementing NFPA 70E requirements. This presentation will discuss PPPL's approaches to the areas of electrical hazards evaluation, both shock and arc flash; engineered solutions for hazards mitigation such as remote racking of medium voltage breakers, operational changes for hazards avoidance, targeted personnel training and hazard appropriate personal protective equipment. Practical solutions for nominal voltage identification and zero voltage checks for lockout/tagout will also be covered. Finally, we will review the value of a comprehensive electrical drawing program, employee attitudes expressed as a personal safety work ethic, integrated safety management, and sustained management support for continuous safety improvement.
Date:
March 4, 2008
Creator:
Camp, R.
Object Type:
Article
System:
The UNT Digital Library
Electrochemical Machining of Metal Plates
Electrochemical machining (ECM) with concentrated sodium chlorate electrolyte was used to rapidly cut a circular groove (13 cm diameter, 0.2 cm wide) through a 0.15 cm thick sheet of steel--thus opening a 5-inch porthole in as little as 10 minutes. The most favorable operating conditions were: T = 22 C; chlorate concentration 600 g NaClO{sub 3}/liter-solution; electric power of 100 A at 10 V; and flow of 0.5 l/s at a pressure drop of 10 kPa (1.5 psi). The porthole may be removed entirely by electrochemical means, or the electrochemical dissolution may continue until only thin membrane remains that is subsequently cut with a utility knife. An array of thermocouples was used to track temperature in the flowing solution and in the trough being machined; the maximum increase in temperature in the trough was 5 C over that of the flowing electrolyte which increased in temperature by 19 C because of power dissipation. ECM is shown feasible for rapid perforation of plates of ferrous and non-ferrous metals using portable equipment and commercial batteries. The technique can be extended to cut perforations of arbitrary shape through non-planar surfaces using a deformable ring cathode. Analysis of the power requirements for electrolyte flow …
Date:
March 4, 2005
Creator:
Cooper, J F & Evans, M C
Object Type:
Report
System:
The UNT Digital Library
[Email from Daniel Graney to multiple recipients]
Email from Daniel Graney to multiple recipients on March 4, 2009, discussing a press release about the Texas Stonewall Democratic Caucus first biennial statewide conference in Austin, Texas.
Date:
March 4, 2009
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
The Emergency Planning and Community Right-to-Know Act (EPCRA): A Summary
This report summarizes the Emergency Planning and Community Right-to-Know Act (EPCRA) and the major regulatory programs that mandate reporting by industrial facilities of releases of hazardous chemicals to the environment, as well as local planning to respond in the event of significant, accidental releases.
Date:
March 4, 2009
Creator:
Schierow, Linda-Jo
Object Type:
Report
System:
The UNT Digital Library
Ensemble: 2003-03-04 – Spectrum 4
Access:
Use of this item is restricted to the UNT Community
Recital presented at the UNT College of Music Recital Hall.
Date:
March 4, 2003
Creator:
Spectrum
Object Type:
Sound
System:
The UNT Digital Library
Ensemble: 2003-03-04 – Tuba/Euphonium Ensemble
Access:
Use of this item is restricted to the UNT Community
Recital presented at the UNT College of Music Recital Hall.
Date:
March 4, 2003
Creator:
University of North Texas. 7:00 Tuba-Euphonium Ensemble.
Object Type:
Sound
System:
The UNT Digital Library
Ensemble: 2004-03-04 – Zebras
Access:
Use of this item is restricted to the UNT Community
Concert presented at the UNT College of Music Kenton Hall.
Date:
March 4, 2004
Creator:
University of North Texas. Zebras.
Object Type:
Sound
System:
The UNT Digital Library
Ensemble: 2008-03-04 – Concert Choir and A Cappella Choir
Access:
Use of this item is restricted to the UNT Community
Concert presented at the UNT College of Music Winspear Performance Hall.
Date:
March 4, 2008
Creator:
University of North Texas. Concert Choir.
Object Type:
Sound
System:
The UNT Digital Library