Serial/Series Title
Fiscal Year 2007
4
Winter Fuels Report
4
Fiscal Year 2005
2
Proceedings of RIKEN BNL Research Center Workshop
2
Carbon Sequestration on Surface Mine Lands Quarterly Report
1
Development of Novel Electrocatalysts for Proton Exchange Membrane Fuel Cells Annual Report
1
Elastic-Wavefield Seismic Stratigraphy: A New Seismic Imaging Technology Progress Report
1
Fiscal Year 1976
1
Fiscal Year 1994
1
Fiscal Year 1998
1
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2,723 Matching Results
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High Electron Mobility InN
None
Date:
February 6, 2007
Creator:
Jones, R. E.; Li, S. X.; Haller, E. E.; van Genuchten, H. C. M.; Yu, K. M.; Ager, J. W., III et al.
Object Type:
Article
System:
The UNT Digital Library
Structural Properties of Ge Nanocrystals Embedded inSapphire
None
Date:
September 6, 2006
Creator:
Sharp, I. D.; Xu, Q.; Yi, D. O.; Yuan, C. W.; Beeman, J. W.; Yu, K. M. et al.
Object Type:
Article
System:
The UNT Digital Library
Universal bandgap bowing in group III nitride alloys
The energy gaps of MBE-grown wurtzite-structure In{sub 1-x}Al{sub x}N alloys with x {le} 0.25 have been measured by absorption and photoluminescence experiments. The results are consistent with the recent discovery of a narrow bandgap of {approx}0.8 eV for InN. A bowing parameter of 3 eV was determined from the composition dependence of these bandgaps. Combined with previously reported data of InGaN and AlGaN, these results show a universal relationship between the bandgap variations of group III nitride alloys and their compositions.
Date:
August 6, 2002
Creator:
Wu, J.; Walukiewicz, W.; Yu, K. M.; Ager, J. W., III; Li, S. X.; Haller, E. E. et al.
Object Type:
Article
System:
The UNT Digital Library
The OZI rule: A unique selector of glueballs and hadron spectroscopy
In the first part of this talk I have reviewed the history of the OZI rule. I then have shown how it is a unique selector glueballs and new quarks in hadron spectroscopy. In particular the only glueball candidates which cannot be explained by other hypotheses within QCD are the I{sup G}J{sup PC} = 0{sup +}2{sup ++} g{sub T}(2010), g{sub T},(2300) and g{sub T{double prime}}(2340) observed in the OZI suppressed reaction {pi}{sup {minus}} p {yields} {phi}{phi}n. The narrowness of the J/{psi} and T can only be explained by OZI suppression. I then reminisced about the 1954 Rochester Conference in which our work on {pi}{sup {plus minus}}p total cross sections and {pi}{sup {plus minus}} production combined gave convincing evidence for the delta being the first resonance. Described how the 1964 Dubna Conference results on small angle {pi}{sup {plus minus}}p elastic scattering led to the first critical experimental check of the pion-nucleon forward dispersion relations which showed that the basic axions of modern field theory worked on strong interactions at high energies. I finally reminisced about glueballs in the 1982 and 1988 Rochester Conferences. 52 refs., 17 figs., 3 tabs.
Date:
August 6, 1990
Creator:
Lindenbaum, S. J.
Object Type:
Article
System:
The UNT Digital Library
Extraction of short-lived zirconium and hafnium isotopes usingcrown ethers: A model system for the study of rutherfordium
The extraction of zirconium and hafnium from hydrochloric acid media was studied using the crown ethers dibenzo-18-crown-6 (DB18C6), dicyclohexano-18-crown-6 (DC18C6) and dicyclohexano-24-crown-8 (DC24C8) as extractants. The goal was to find an extraction system that exhibits a high selectivity between the members of group 4 of the periodic table and is suitable for the study of rutherfordium. It was found that Zr and Hf are both extracted using DB18C6, DC18C6 and DC24C8. The extraction yield increases with increasing acid concentration and increasing concentration of crown ether. The extracted species most likely consists of an ion-association complex formed between a Zr or Hf chloro complex and a hydronium crown ether complex. Conditions can be found for each extractant that provide for the separation of Zr from Hf. This selective separation between Zr and Hf makes the extraction with crown ethers from HCl well suited to study the extraction behavior of Rf and compare it to the behavior of Zr and Hf. These extraction systems can be used to determine whether the extraction behavior of Rf is similar to Zr, similar to Hf or follows the trend established by the lighter homologs. The extraction kinetics are fast enough for the study of the …
Date:
July 6, 2005
Creator:
Sudowe, Ralf; Calvert, Michael G.; Dullmann, Christoph E.; Farina, Lindsy M.; Folden, Charles M., III; Gregorich, Kenneth E. et al.
Object Type:
Article
System:
The UNT Digital Library
Stella Experiment: Hardware Issues
The Staged Electron Laser Acceleration (STELLA) experiment is currently being assembled and tested at the BNL Accelerator Test Facility (ATF). The existing BNL inverse free electron laser (IFEL) has been positioned upstream of the inverse Cerenkov acceleration (ICA) experiment on Beamline {number_sign}1. This beamline also features new quadrupoles and a new spectrometer capable of a {+-}20% energy acceptance. A new laser beam transport system has been installed to permit accurate control of the laser phase for the laser beams sent to the IFEL and ICA devices. Detection of the microbunches are performed using a coherent transition radiation (CTR) diagnostic similar to one already demonstrated at the ATF.
Date:
July 6, 1998
Creator:
Kusche, K. P.; Campbell, L. P.; Gottschalk, S. C.; Kimura, W. D.; Quimby, D. C.; Robinson, K. E. et al.
Object Type:
Article
System:
The UNT Digital Library
Kinetic measurement and prediction of the hydrogen outgassing from the polycrystalline LiH/Li2O/LiOH system
Due to the exothermic reaction of lithium hydride (LiH) salt with water during transportation and handling, there is always a thin film of lithium hydroxide (LiOH) present on the LiH surface. In dry or vacuum storage, this thin LiOH film slowly decomposes. We have used temperature-programmed reaction/decomposition (TPR) in combination with the isoconversion method of thermal analysis to determine the outgassing kinetics of H{sub 2}O from pure LiOH and H{sub 2} and H{sub 2}O from this thin LiOH film. H{sub 2} production via the reaction of LiH with LiOH, forming a lithium oxide (Li{sub 2}O) interlayer, is thermodynamically favored, with the rate of further reaction limited by diffusion through the Li{sub 2}O and the stability of the decomposing LiOH. Lithium hydroxide at the LiOH/vacuum interface also decomposes easily to Li{sub 2}O, releasing H{sub 2}O which subsequently reacts with LiH in a closed system to form H{sub 2}. At the onset of dry decomposition, where H{sub 2} is the predominant product, the activation energy for outgassing from a thin LiOH film is lower than that for bulk LiOH. However, as the reactions at the LiH/Li{sub 2}O/LiOH and at the LiOH/vacuum interfaces proceed, the overall activation energy barrier for the outgassing approaches …
Date:
April 6, 2005
Creator:
Dinh, L. N.; Grant, D. M.; Schildbach, M. A.; Smith, R. A.; Siekhaus, W. J.; Balazs, B. et al.
Object Type:
Article
System:
The UNT Digital Library
Neural Interface for Deep Brain Stimulation
None
Date:
June 6, 2013
Creator:
Tooker, A. C.; Madsen, T. E.; Crowell, A.; Shah, K. G.; Felix, S. H.; Mayberg, H. S. et al.
Object Type:
Article
System:
The UNT Digital Library
Needs Differing: Personality Dynamics for Peer Ombuds in a Research Setting
The peer ombuds program at University of California's Lawrence Livermore National Laboratory (LLNL) is unique in many respects, and the challenges it poses for its practitioners are likewise unique. The ombuds themselves are members of the workforce they serve, and must constantly fulfill a dual role. Cases range from conflict with supervisors or co-workers to medical leave issues. Mismatched expectations and poor communication skills obviously underlie many problems. The interplay of personality type affects conflict (and its resolution) more subtly, principally through its role in shaping client needs. Through a hypothetical case description, the author highlights the dynamics of personality type involved in the ombuds process at LLNL. The implications of temperamental difference argue for an awareness of, and sensitivity to, type differences in the population served.
Date:
October 6, 2004
Creator:
Wolford, J. K., Jr.
Object Type:
Article
System:
The UNT Digital Library
Criteria for Second Stability for Ballooning Modes in Stellarators
An expression determining how variations in the pressure-gradient and average magnetic shear affect ballooning stability for a stellarator equilibrium is presented. The procedure for determining the marginal stability boundaries, for each field line, depends only on the equilibrium and a single ballooning eigenfunction calculation. This information is sufficient to determine if increasing pressure-gradient is stabilizing or destabilizing and to predict whether the configuration possess a second stable region.
Date:
July 6, 2004
Creator:
Hudson, S. R. & Hegna, C. C.
Object Type:
Report
System:
The UNT Digital Library
Accelerated test methods for life prediction of hermetic motor insulation systems exposed to alternative refrigerant/lubricant mixtures. Phase 3: Reproducibility and discrimination testing. Final report
In 1992, the Air-Conditioning and Refrigeration Technology Institute, Inc. (ARTI) contracted Radian Corporation to ascertain whether an improved accelerated test method or procedure could be developed that would allow prediction of the life of motor insulation materials used in hermetic motors for air-conditioning and refrigeration equipment operated with alternative refrigerant/lubricant mixtures. This report presents the results of phase three concerning the reproducibility and discrimination testing.
Date:
May 6, 1996
Creator:
Ellis, P. F., II; Ferguson, A. F. & Fuentes, K. T.
Object Type:
Report
System:
The UNT Digital Library