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Scientific Report (2002-2004)
OAK-B135 An overview of our work as well as two recent publications are contained in this scientific report. The work reported here revolves around the discovery of new coherent nonlinear kinetic waves in laser produced plasmas, we call KEEN waves (kinetic, electrostatic electron nonlinear waves), and optical mixing experiments on the Imega laser system at LLE with blue-green light for the exploration of ways to suppress parametric instabilities in long scale length, long pulsewidth laser-plasmas such as those which will be found on NIF or LMJ.
Date:
May 11, 2004
Creator:
Afeyan, Bedros
Object Type:
Report
System:
The UNT Digital Library
Timpson & Tenaha News (Timpson, Tex.), Vol. 19, No. 10, Ed. 1 Thursday, March 11, 2004
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
March 11, 2004
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Timpson & Tenaha News (Timpson, Tex.), Vol. 19, No. 44, Ed. 1 Thursday, November 11, 2004
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
November 11, 2004
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Electron Line Broadening in Plasmas: Resolution of the Quantum vs. Semiclassical Calculations Puzzle
Puzzling discrepancies between on the one hand quantum mechanical (QM) electron impact calculations of isolated ion lines and on the other hand experimental data and nonperturbative semiclassical (SC) calculations are reviewed. The origin of these discrepancies was a standard line-broadening literature estimate of the wavefunction extent. The nonperturbative semiclassical calculations are further improved by dropping the long-range approximation and allowing penetrating collisions. This results in excellent agreement with fully quantal calculations for the case of the BIII 2s-2p line. On the other hand the standard perturbative semiclassical method is inadequate even in this particular example, where perturbation theory is valid. Further, the assumption of neglecting the back-reaction in semiclassical calculations is examined.
Date:
May 11, 2004
Creator:
Alexiou, S & Lee, R
Object Type:
Article
System:
The UNT Digital Library
Asymmetric injection of cathodic arc plasma into a macroparticlefilter
The cathodic arc plasmas produced by cathode spots usuallyinclude macroparticles, which is undesirable for many applications. Acommon way of removing macroparticles is to use curved solenoid filterswhich guide the plasma from the source to the substrate. In this work, anarc source with relatively small cathode is used, limiting the possiblelocations of plasma production. The relative position of cathodic arcsource and macroparticle filtered was systematically varied and thefiltered plasma current was recorded. It was found that axis-symmetricplasma injection leads to maximum throughput only if an anode aperturewas used, which limited the plasma to near-axis flow by scraping offplasma at larger angles to the axis. When the anode aperture was removed,more plasma could enter the filter. In this case, maximum filtered ioncurrent was achieved when the plasma was injected off-axis, namely offsetin the direction where the filter is curved. Such behavior wasanticipated because the plasma column in the filter is known to beshifted by ExB and centrifugal drift as well as by non-axis-symmetriccomponents of the magnetic field in the filter entrance and exit plane.The data have implications for plasma transport variations caused bydifferent spot locations on cathodes that are not small compared to thefilter cross section.
Date:
February 11, 2004
Creator:
Anders, Andre & MacGill, Robert A.
Object Type:
Article
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 105, No. 256, Ed. 1 Sunday, January 11, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 11, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 105, No. 283, Ed. 1 Wednesday, February 11, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 11, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 105, No. 308, Ed. 1 Thursday, March 11, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 11, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 9, Ed. 1 Sunday, April 11, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 11, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 35, Ed. 1 Tuesday, May 11, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
May 11, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 62, Ed. 1 Friday, June 11, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
June 11, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 87, Ed. 1 Sunday, July 11, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 11, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 113, Ed. 1 Wednesday, August 11, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
August 11, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 165, Ed. 1 Monday, October 11, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
October 11, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 186, Ed. 1 Thursday, November 11, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 11, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Development of a Robust Tri-Carbide Fueled Reactor for Multimegawatt Space Power and Propulsion Applications
An innovative reactor core design based on advanced, mixed carbide fuels was analyzed for nuclear space power applications. Solid solution, mixed carbide fuels such as (U,Zr,Nb)c and (U,Zr, Ta)C offer great promise as an advanced high temperature fuel for space power reactors.
Date:
August 11, 2004
Creator:
Anghaie, Samim; Knight, Travis W.; Plancher, Johann & Gouw, Reza
Object Type:
Report
System:
The UNT Digital Library
Effects of Radiative Recombination and Photon Recycling on Minority Carrier Lifetime in Epitaxial GaINAsSb Lattice-matched to GaSb
None
Date:
May 11, 2004
Creator:
Anikeev, S.; Donetsky, D.; Belenky, G.; Luryl, S.; Wang, C. A.; Shiau, D. A. et al.
Object Type:
Report
System:
The UNT Digital Library
Incident Analysis Report: B696 MOVER Event, August 19, 2004
On August 19, 2004, three operators [employees of Washington TRU Solutions Central Characterization Project (CCP)] and one Health and Safety Technician [(H&ST), an employee of the University of California (UC)] were working in the mobile characterization unit, known as the Mobile Visual Examination and Repackaging Unit (MOVER). The unit, which was located in the Decontamination and Waste Treatment Facility (DWTF) Yard, uses a glovebox to repackage Transuranic (TRU) drums. Work was in progress on the last set of drums to be repackaged. Work had been completed on a TRU drum that was on its way out of the unit. Work had begun on a 0.6-plutonium-equivalent curie (PE Ci) TRU container. During the bag-in process for the 0.6-PE Ci container, operators encountered contamination measuring 6,000 counts per minute (cpm), or approximately 12,000 disintegrations per minute (dpm) on the exposed area of the drum port. The operators decontaminated the exposed, contaminated area of the drum port, and this exposed area was swiped again. The area was declared clean. During bag-out of the previous drum, operators noticed that the retaining band was not tightened optimally; therefore, the retaining band was replaced with a new one on this drum. The three operators and LLNL …
Date:
November 11, 2004
Creator:
Beach, D. R.; Carr, S.; Anderson, B.; Lewis, J.; Merrigan, J.; Richards, J. et al.
Object Type:
Report
System:
The UNT Digital Library
The Magnesium Branch of the Tetrapyrrole Biosynthetic Pathway
It should be noted that the focus of the research changed somewhat during the course of the current award. The initial focus is indicated by the title of the current grant, ''The Magnesium Branch of the Chlorophyll Biosynthetic Pathway''. During the current grant period, Dr. Robert Willows, a postdoctoral associate, joined the faculty of McQuarie University in Australia. When he left my lab, we decided that he should independently pursue research on structure/function relationships in Mg chelatase and that our laboratories would collaborate on regulatory studies of this enzyme. Also, during the current award period, I began collaborating with Dr. Ariane Atteia and Mr. Robert van Lis, who were at the time located at the Autonomous University of Mexico. Dr. Atteia has since joined my laboratory and Mr. van Lis will also do so when he obtains his Ph.D. in the near future. These individuals bring to the laboratory their interests and expertise in the respiratory components of Chlamydomonas and their desire to become experts in tetrapyrrole metabolism. Recently, in a collaboration with Dr. David Bollivar, a former postdoctoral associate who is now at Illinois Wesleyan University, and Dr. Caroline Walker, who was at Clemson University but has since left …
Date:
May 11, 2004
Creator:
Beale, S. I.
Object Type:
Report
System:
The UNT Digital Library
Modeling and characterization of recompressed damaged materials
Experiments have been performed to explore conditions under which spall damage is recompressed with the ultimate goal of developing a predictive model. Spall is introduced through traditional gas gun techniques or with laser ablation. Recompression techniques producing a uniaxial stress state, such as a Hopkinson bar, do not create sufficient confinement to close the porosity. Higher stress triaxialities achieved through a gas gun or laser recompression can close the spall. Characterization of the recompressed samples by optical metallography and electron microscopy reveal a narrow, highly deformed process zone. At the higher pressures achieved in the gas gun, little evidence of spall remains other than differentially etched features in the optical micrographs. With the very high strain rates achieved with laser techniques there is jetting from voids and other signs of turbulent metal flow. Simulations of spall and recompression on micromechanical models containing a single void suggest that it might be possible to represent the recompression using models similar to those employed for void growth. Calculations using multiple, randomly distributed voids are needed to determine if such models will yield the proper behavior for more realistic microstructures.
Date:
February 11, 2004
Creator:
Becker, R.; Cazamias, J. U.; Kalantar, D. H.; LeBlanc, M. M. & Springer, H. K.
Object Type:
Report
System:
The UNT Digital Library
Protocols for Thermoluninescence and Optically Stimulated Luminescence Research at DOSAR
The Life Sciences Division (LSD) of Oak Ridge National Laboratory (ORNL) has a long record of radiation dosimetry research at the Dosimetry Applications Research (DOSAR) facility complex. These facilities have been used by a broad segment of the research community to perform a variety of experiments in areas including, but not limited to, radiobiology, radiation dosimeter and instrumentation development and calibration, and materials testing in a variety of radiation environments. Collaborations with the University of Tennessee-Knoxville (UTK) have also led to important contributions in the area of archaeometry, particularly as it relates to the use of radiation dosimetry to date archaeological artifacts. This manual is to serve as the primary instruction and operation manual for dosimetric and archaeometric research at DOSAR involving thermoluminescence (TL) and optically stimulated luminescence (OSL). Its purpose is to (1) provide protocols for common practices associated with the research, (2) outline the relevant organizational structure, (3) identify the Quality Assurance plan, and (4) describe all the procedures, operations, and responsibilities for safe and proper operation of associated equipment. Each person who performs research at DOSAR using TL/OSL equipment is required to read the latest revision of this manual and be familiar with its contents, and to …
Date:
October 11, 2004
Creator:
Bernal, S. M. & Bogard, J. S.
Object Type:
Report
System:
The UNT Digital Library
Comparison of up-scaling methods in poroelasticity and its generalizations
None
Date:
June 11, 2004
Creator:
Berryman, James G.
Object Type:
Presentation
System:
The UNT Digital Library
Diagnostics for intense heavy ion beams in the HIF-VNL
Modern diagnostic techniques provide detailed information on beam conditions in injector, transport, and final focus experiments in the HIF-VNL. Parameters of interest include beam current, beam energy, transverse and longitudinal distributions, emittance, and space charge neutralization. Imaging techniques, based on kapton films and optical scintillators, complement and in some cases, may replace conventional techniques based on slit scans. Time-resolved optical diagnostics that provide 4-D transverse information on the experimental beams are in operation on the existing experiments. Current work includes a compact optical diagnostic suitable for insertion in transport lines, improved algorithms for optical data analysis and interpretation, a high-resolution electrostatic energy analyzer, and an electron beam probe. A longitudinal diagnostic kicker generates longitudinal space-charge waves that travel on the beam. Time of flight of the space charge waves and an electrostatic energy analyzer provide an absolute measure of the beam energy. Special diagnostics to detect secondary electrons and gases desorbed from the wall have been developed.
Date:
June 11, 2004
Creator:
Bieniosek, F. M.; Eylon, S.; Faltens, A.; Friedman, A.; Kwan, J. W.; Leitner, M. A. et al.
Object Type:
Article
System:
The UNT Digital Library
Methods for Calibrating Basin-Wide Hydroacoustic Propagation in the Indian Ocean
This collaborative project was designed to test and compare methods for achieving full ocean basin propagation of hydroacoustic signals in the 5-100 Hz frequency band. Plans for a systematic calibration of the International Monitoring System (IMS) for nuclear testing were under consideration in 2000/2001. The results from this project provide information to guide such planning for future ocean basin calibration work. Several acoustic source types were tested during two sea-going experiments and most were successful at generating signals that propagated hundreds to thousands of km to be recorded at the Indian Ocean IMS hydrophone stations. Development and numerical modeling of imploding glass sphere sources was one component of this testing. The intent was to design a relatively simple-to-use source that is not subject to restrictions that can limit use of explosive charges, but whose signal is large enough to propagate 100-1000's km range. Analysis of IMS hydrophone data recording during the experiments was used to illustrate the extent of energy loss during signal propagation and to assess the accuracy with which the small acoustic sources could be located using methods typically employed for nuclear monitoring.
Date:
October 11, 2004
Creator:
Blackman, D; de Groot-Hedlin, C; Orcutt, J A; Harben, P H; Clarke, D B & Ramirez, A L
Object Type:
Report
System:
The UNT Digital Library