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Time-resolved soft-x-ray spectroscopy of a magnetic octupole transition in nickel-like xenon, cesium, and barium ions
A microcalorimeter with event mode capability for time-resolved soft-x-ray spectroscopy, and a high-resolution flat-field EUV spectrometer have been employed at the Livermore EBIT-I electron beam ion trap for observations and wavelength measurements of M1, E2, and M3 decays of long-lived levels in the Ni-like ions Xe{sup 26+}, Cs{sup 27+}, and Ba{sup 28+}. Of particular interest is the lowest excited level, 3d{sup 9}4s {sup 3}D{sub 3}, which can only decay via a magnetic octupole (M3) transition. For this level in Xe an excitation energy of (590.40 {+-} 0.03eV) and a level lifetime of (11.5 {+-} 0.5 ms) have been determined.
Date:
November 11, 2005
Creator:
Trabert, E; Beiersdorfer, P; Brown, G V; Boyce, K; Kelley, R L; Kilbourne, C A et al.
Object Type:
Article
System:
The UNT Digital Library
Experimental Research on the Laser Cyclotron Auto-Resonance Accelerator “LACARA”
The Laser Cyclotron Auto-Resonant Accelerator LACARA has successfully operated this year. Results are summarized, an interpretation of operating data is provided in the body of the report, and recommendations are made how the experiment should be carried forward. The Appendix A contains a description of the LACARA apparatus, currently installed at the Accelerator Test Facility, Brookhaven National Laboratory. This report summarizes the project, extending over three grant-years.
Date:
November 11, 2008
Creator:
Marshall, T C
Object Type:
Report
System:
The UNT Digital Library
SAVANNAH RIVER NATIONAL LABORATORYREGENERATIVE FUEL CELL PROJECT
A team comprised of governmental, academic and industrial partners led by the Savannah River National Laboratory developed and demonstrated a regenerative fuel cell system for backup power applications. Recent market assessments have identified emergency response and telecommunication applications as promising near-term markets for fuel cell backup power systems. The Regenerative Fuel Cell System (RFC) consisted of a 2 kg-per-day electrolyzer, metal-hydride based hydrogen storage units and a 5 kW fuel cell. Coupling these components together created a system that can produce and store its own energy from the power grid much like a rechargeable battery. A series of test were conducted to evaluate the performance of the RFC system under both steady-state and transit conditions that might be encountered in typical backup power applications. In almost all cases the RFC functioned effectively. Test results from the demonstration project will be used to support recommendations for future fuel cell and hydrogen component and system designs and support potential commercialization activities. In addition to the work presented in this report, further testing of the RFC system at the Center for Hydrogen Research in Aiken County, SC is planned including evaluating the system as a renewable system coupled with a 20kW-peak solar photovoltaic …
Date:
November 11, 2008
Creator:
Motyka, T
Object Type:
Report
System:
The UNT Digital Library
Critical Vacancy-Driven Phenomena in High-Energy Ion-Implanted Silicon
High-energy (MeV) ion implantation is now being rapidly introduced into integrated circuit manufacturing because it promises process simplification and improved device performance. However, high-energy implantation introduces an imbalance of excess vacancies and vacancy-cluster defects in the near-surface region of a silicon crystal. These defects interact with dopants affecting diffusion and electrical activation during subsequent processing. The objective of this project was to develop sufficient understanding of the physical mechanisms underlying the evolution of these defects and interactions with dopant atoms to enable accurate prediction and control of dopant diffusion and defect configurations during processing. This project supported the DOE mission in science and technology by extending ongoing Basic Energy Sciences programs in ion-solid physics and x-ray scattering at ORNL into new areas. It also strengthened the national capability for advanced processing of electronic materials, an enabling technology for DOE programs in energy conversion, use, and defense.
Date:
November 11, 2008
Creator:
Haynes, T.E.
Object Type:
Report
System:
The UNT Digital Library
Utilization of Magnetorheological Finishing as a Diagnostic Tool for Investigating the Three-Dimensional Structure of Fractures in Fused Silica
We have developed an experimental technique that combines magnetorheological finishing (MRF) and microscopy to examine fractures and/or artifacts in optical materials. The technique can be readily used to provide access to, and interrogation of, a selected segment of a fracture or object that extends beneath the surface. Depth slicing, or cross-sectioning at selected intervals, further allows the observation and measurement of the three-dimensional nature of the sites and the generation of volumetric representations that can be used to quantify shape and depth, and to understand how they were created, how they interact with surrounding material, and how they may be eliminated or mitigated.
Date:
November 11, 2005
Creator:
Menapace, J A; Davis, P J; Steele, W A; Wong, L L; Suratwala, T I & Miller, P E
Object Type:
Article
System:
The UNT Digital Library
The Greensheet (Houston, Tex.), Vol. 40, No. 486, Ed. 1 Wednesday, November 11, 2009
Free weekly newspaper that includes business and classified advertising.
Date:
November 11, 2009
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 39, No. 481, Ed. 1 Tuesday, November 11, 2008
Free weekly newspaper that includes business and classified advertising.
Date:
November 11, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 36, No. 478, Ed. 1 Friday, November 11, 2005
Free weekly newspaper that includes business and classified advertising.
Date:
November 11, 2005
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 39, No. 482, Ed. 1 Tuesday, November 11, 2008
Free weekly newspaper that includes business and classified advertising.
Date:
November 11, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 36, No. 480, Ed. 1 Friday, November 11, 2005
Free weekly newspaper that includes business and classified advertising.
Date:
November 11, 2005
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Optimist (Abilene, Tex.), Vol. 98, No. 23, Ed. 1 Wednesday, November 11, 2009
Bi-weekly student newspaper from Abilene Christian University in Abilene, Texas that includes local, state and campus news along with advertising.
Date:
November 11, 2009
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Mannford Eagle (Mannford, Okla.), Vol. 52, No. 24, Ed. 1 Wednesday, November 11, 2009
Weekly newspaper from Mannford, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 11, 2009
Creator:
Hughes, Dustin
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Cherokeean Herald (Rusk, Tex.), Vol. 160, No. 38, Ed. 1 Wednesday, November 11, 2009
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
November 11, 2009
Creator:
Whitehead, Marie
Object Type:
Newspaper
System:
The Portal to Texas History
North Texas Daily (Denton, Tex.), Vol. 92, No. 45, Ed. 1 Tuesday, November 11, 2008
Daily student newspaper from the University of North Texas in Denton, Texas that includes local, state and campus news along with advertising.
Date:
November 11, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
North Texas Daily (Denton, Tex.), Vol. 94, No. 44, Ed. 1 Wednesday, November 11, 2009
Daily student newspaper from the University of North Texas in Denton, Texas that includes local, state and campus news along with advertising.
Date:
November 11, 2009
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The University News (Irving, Tex.), Vol. 34, No. 9, Ed. 1 Tuesday, November 11, 2008
Weekly student newspaper from the University of Dallas in Irving, Texas that includes campus news and commentaries along with advertising.
Date:
November 11, 2008
Creator:
Tetzlaff, Mary
Object Type:
Newspaper
System:
The Portal to Texas History
The Rambler (Fort Worth, Tex.), Vol. 92, No. 23, Ed. 1 Wednesday, November 11, 2009
Weekly student newspaper from Texas Wesleyan University in Fort Worth, Texas that includes campus and local news along with advertising.
Date:
November 11, 2009
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Rambler (Fort Worth, Tex.), Vol. 92, No. 23, Ed. 1 Wednesday, November 11, 2009
Weekly student newspaper from Texas Wesleyan University in Fort Worth, Texas that includes campus and local news along with advertising.
Date:
November 11, 2009
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Autonomous Pathogen Detection System FY02 Annual Progress Report
The objective of this project is to design, fabricate and field demonstrate a biological agent detection and identification capability, the Autonomous Pathogen Detector System (APDS). Integrating a flow cytometer and real-time polymerase chain reaction (PCR) detector with sample collection, sample preparation and fluidics will provide a compact, autonomously operating instrument capable of simultaneously detecting multiple pathogens and/or toxins. The APDS will operate in fixed locations, continuously monitoring air samples and automatically reporting the presence of specific biological agents. The APDS will utilize both multiplex immunoassays and nucleic acid assays to provide ''quasi-orthogonal'' multiple agent detection approaches to minimize false positives and increase the reliability of identification. Technical advances across several fronts must occur, however, to realize the full extent of the APDS. The end goal of a commercially available system for civilian biological weapon defense will be accomplished through three progressive generations of APDS instruments. The APDS is targeted for civilian applications in which the public is at high risk of exposure to covert releases of bioagent, such as major subway systems and other transportation terminals, large office complexes and convention centers. APDS is also designed to be part of a monitoring network of sensors integrated with command and control …
Date:
November 11, 2002
Creator:
Colston, B.; Brown, S.; Burris, K.; Elkin, C.; Hindson, B.; Langlois, R. et al.
Object Type:
Report
System:
The UNT Digital Library
Letter to the Editors of Physics Today
Two points in our recent article on Edward Teller's scientific life (Physics Today, August 2004, page 45) require correction. In our description of Teller's students, we incorrectly stated that Arthur Kantrowitz's thesis was on the generation of hypersonic molecular beams. Actually, his thesis was on heat capacity lags in gas dynamics. Kantrowitz's invention of high intensity sources for molecular beams came later in his career. Maurice Goldhaber has emphasized that the situation with respect to possible nuclear resonances in ({gamma},n) or ({gamma},fission) reactions was quite unclear at the time of George C. Baldwin and G. Stanley Klaiber's papers on these reactions. This was because the rapid rise of their yield to a prominent peak with increasing energy, followed by a slower fall off was then thought to have been due to the competition between the rapidly rising density of nuclear states and the eventual domination of other reaction channels at higher energies. Goldhaber realized, however, that there could be an analogy between a possible collective nuclear resonance and the restrahl resonance (essentially the transverse optical phonon mode) in polar crystals. Goldhaber sought out Teller because of his paper with Russell Lyddane and Robert Sachs, relating the restrahl frequency to the …
Date:
November 11, 2004
Creator:
Libby, S B & Weiss, M S
Object Type:
Article
System:
The UNT Digital Library
Example Programs for KINSOL v2.2.0
None
Date:
November 11, 2004
Creator:
Collier, A M & Serban, R
Object Type:
Text
System:
The UNT Digital Library
Radiative Corrections to One-Photon Decays of Hydrogenic Ions
Radiative corrections to the decay rate of n = 2 states of hydrogenic ions are calculated. The transitions considered are the M1 decay of the 2s state to the ground state and the E1(M2) decays of the 2p{sub 1/2} and 2p{sub 3/2} states to the ground state. The radiative corrections start in order {alpha}(Z{alpha}){sup 2}, but the method used sums all orders of Z{alpha}. The leading {alpha}(Z{alpha}){sup 2} correction for the E1 decays is calculated and compared with the exact result. The extension of the calculational method to parity nonconserving transitions in neutral atoms is discussed.
Date:
November 11, 2003
Creator:
Sapirstein, J; Pachucki, K & Cheng, K T
Object Type:
Article
System:
The UNT Digital Library
A Study of the Ion Hose Instability in the DARHT-II Downstream Transport Region
The second axis of the DARHT flash X-ray facility at Los Alamos National Laboratory (''DARHT-II'') is a multiple-pulse, 18.4 MeV, 2 kA induction electron linear accelerator [1]. A train of short ({approx}50 ns) pulses are converted via bremsstrahlung to X-rays, which are then used to make radiographic images at various times (nominally four) during a ''hydrotest'' experiment. The train of pulses is created by carving them out of a two microsecond long macropulse, using a fast switching element called a kicker [2]. The unused portion of the macropulse is absorbed in a beam dump. Thus, upstream of the kicker, two microseconds of beam are transported through a vacuum system roughly sixty meters long. These conditions involve length and, specifically, time scales which are new to the transport of high-current beams. A concern under such conditions are the macroscopic interactions between the electron beam and positive ions created by impact ionization of the residual gas in the vacuum system. Over two microseconds, the ion density can develop to a hundredth or even a tenth of a percent of the beam density--small, to be sure, but large enough to have cumulative effects over such a long transport distance. Two such effects will …
Date:
November 11, 2004
Creator:
McCarrick, J F
Object Type:
Report
System:
The UNT Digital Library
NotCal04 - Comparison / Calibration 14C records 26-50 cal kBP
The radiocarbon calibration curve, IntCal04, extends back to 26 cal kBP. While several high resolution records exist beyond this limit, these data sets exhibit discrepancies one to another of up to several millennia. As a result, no calibration curve for the time range 26-50 cal kBP can be recommended as yet, but in this paper the IntCal04 working group compares the available data sets and offers a discussion of the information that they hold.
Date:
November 11, 2004
Creator:
der Plicht, J. V.; Beck, J.; Bard, E. & Baille, M.
Object Type:
Article
System:
The UNT Digital Library