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12,983 Matching Results
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Structural properties of the geometrically frustrated pyrochlore Tb2Ti2O7
Although materials that exhibit nearest-neighbor-only antiferromagnetic interactions and geometrical frustration theoretically should not magnetically order in the absence of disorder, few such systems have been observed experimentally. One such system appears to be the pyrochlore Tb{sub 2}Ti{sub 2}O{sub 7}. However, previous structural studies indicated that Tb{sub 2}Ti{sub 2}O{sub 7} is an imperfect pyrochlore. To clarify the situation, we performed neutron powder diffraction (NPD) and x-ray absorption fine structure (XAFS) measurements on samples that were prepared identically to those that show no magnetic order. The NPD measurements show that the long-range structure of Tb{sub 2}Ti{sub 2}O{sub 7} is well ordered with no structural transitions between 4.5 and 600 K. In particular, mean-squared displacements (u{sup 2}'s) for each site follow a Debye model with no offsets. No evidence for Tb/Ti site interchange was observed within an upper limit of 2%. Likewise, no excess or deficiency in the oxygen stoichiometry was observed, within an upper limit of 2% of the nominal pyrochlore value. Tb L{sub III} and Ti K-edge XAFS measurements from 20-300 K similarly indicate a well-ordered local structure. Other aspects of the structure are considered. We conclude that Tb{sub 2}Ti{sub 2}O{sub 7} has, within experimental error, an ideal, disorder-free pyrochlore lattice, …
Date:
June 14, 2004
Creator:
Han, Sang-Wook; Gardner, Jason S. & Booth, Corwin H.
Object Type:
Article
System:
The UNT Digital Library
Distributed Wind Energy in Idaho
This project is a research and development program aimed at furthering distributed wind technology. In particular, this project addresses some of the barriers to distributed wind energy utilization in Idaho.
Date:
January 31, 2009
Creator:
Gardner, John; Johnson, Kathryn; Haynes, Todd & Seifert, Gary
Object Type:
Report
System:
The UNT Digital Library
Summary of the RHIC Retreat 2007
N/A
Date:
August 1, 2008
Creator:
Pilat, F.; Gardner, C.; Montag, C. & Roser, T.
Object Type:
Report
System:
The UNT Digital Library
Summary of the RHIC Retreat 2007
The RHIC Retreat 2007 took place on July 16-17 2007 at the Foxwoods Resort in CT, about 3 weeks after the end of the RHIC Run-7. The goal of the Retreat is traditionally to plan the upcoming run in the light of the results from the previous one, by providing a snapshot of the present understanding of the machine and a forum for free and frank discussion. A particular attention was paid to the challenge of increasing the time at store, and the related issue of system reliability. An interesting Session covered all new developments aimed to improve the machine performance and luminosity. In Section 2 we summarize the results from Run-7 for RHIC and the injectors and discuss the present objectives of the RHIC program and performance. Sections 3-6 are summaries of the Retreat sessions focused on preparation for deuteron gold and polarized protons, respectively, machine availability and new developments.
Date:
August 1, 2008
Creator:
Pilat, F.; Gardner, C.; Montag, C. & Roser, T.
Object Type:
Report
System:
The UNT Digital Library
Oral History Interview with Eugene Fowler, Jr., Joel D. Fowler, Joe W. Specht, and Melody S. Kelly, October 11, 2008
Access:
Use of this item is restricted to the UNT Community
Interview with Eugene Fowler, Jr., Joel D. Fowler, Joe W. Specht, and Melody Specht Kelly. The interview includes their personal experiences about the Duke and Ayres Store and the University of North Texas Lab School. The Fowlers and the Spechts talk about childhood and education, enlisting, family histories, the Denton square, various jobs, and race issues in Denton. The interview includes an appendix with photographs and articles.
Date:
October 11, 2008
Creator:
Mears, Michelle M.; Fowler, Eugene, Jr.; Fowler, Joel D.; Specht, Joe W. & Kelly, Melody Specht
Object Type:
Book
System:
The UNT Digital Library
Theoria, Volume 12, 2005
Annual journal containing essays, studies, book reviews, and other articles related to the history of Western Music Theory, methods of analysis, and analytical discussions of musical compositions. The appendix includes corrigenda from the preceding volume, information about contributors to the current volume, and an index of content in previously-issued volumes.
Date:
2005
Creator:
Heidlberger, Frank
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Evolution of the Spallation Neutron Source Ring Lattice.
Requirements of minimum beam loss for hand-on maintenance and flexibility for future operations are essential for the lattice design of the Spallation Neutron Source (SNS) accumulator ring. During the past seven years, the lattice has evolved from an all-FODO to a FODO/doublet hybrid, the circumference has been increased to accommodate for a higher energy foreseen with a super-conducting RF linac, and the layout has evolved from an {alpha}- to an {Omega}-geometry. Extensive studies are performed to determine working points that accommodate injection painting and minimize beam losses due to space charge and resonances. In this paper, we review the evolution of the SNS ring lattice and discuss the rationales.
Date:
April 8, 2002
Creator:
Wei, J.; Catalan - Lasheras, N.; Fedotov, A.; Gardner, C. J.; Lee, Y. Y.; Papaphilippou, Y. et al.
Object Type:
Article
System:
The UNT Digital Library
Selective Catalytic Oxidation of Hydrogen Sulfide to Elemental Sulfur from Coal-Derived Fuel Gases
The development of low cost, highly efficient, desulfurization technology with integrated sulfur recovery remains a principle barrier issue for Vision 21 integrated gasification combined cycle (IGCC) power generation plants. In this plan, the U. S. Department of Energy will construct ultra-clean, modular, co-production IGCC power plants each with chemical products tailored to meet the demands of specific regional markets. The catalysts employed in these co-production modules, for example water-gas-shift and Fischer-Tropsch catalysts, are readily poisoned by hydrogen sulfide (H{sub 2}S), a sulfur contaminant, present in the coal-derived fuel gases. To prevent poisoning of these catalysts, the removal of H{sub 2}S down to the parts-per-billion level is necessary. Historically, research into the purification of coal-derived fuel gases has focused on dry technologies that offer the prospect of higher combined cycle efficiencies as well as improved thermal integration with co-production modules. Primarily, these concepts rely on a highly selective process separation step to remove low concentrations of H{sub 2}S present in the fuel gases and produce a concentrated stream of sulfur bearing effluent. This effluent must then undergo further processing to be converted to its final form, usually elemental sulfur. Ultimately, desulfurization of coal-derived fuel gases may cost as much as 15% …
Date:
November 6, 2001
Creator:
Gardner, Todd H.; Berry, David A.; Lyons, K. David; Beer, Stephen K. & Monahan, Michael J.
Object Type:
Article
System:
The UNT Digital Library
U.S. Circuit and District Court Nominations by President George W. Bush During the 107th-109th Congresses
None
Date:
May 24, 2006
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
U.S. Circuit and District Court Nominations by President George W. Bush During the 107th-109th Congresses
None
Date:
January 23, 2007
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Both Sides of the Border: A Scattering of Texas Folklore
Collection of Tex-Mex folklore and related essays, including papers presented at Texas Folklore Society meetings. The book is organized into four topical categories: I. Remembering Our Ancestors, II. Texas-Mexican Folklore, III. Miscellaneous Memorabilia, and IV. The Family Saga (Cont'd).
Date:
November 15, 2004
Creator:
Abernethy, Francis Edward & Untiedt, Kenneth L.
Object Type:
Book
System:
The UNT Digital Library
Polarized proton performance of AGS in run 8 operation
None
Date:
May 4, 2009
Creator:
Huang, H.; Ahrens, L.; Bai, M.; Brown, K. A.; Gardner, C.; Glenn, J. W. et al.
Object Type:
Article
System:
The UNT Digital Library
Fabrication of Cryogenic Manganite Bolometers to Measure the Total Energy at the LCLS Free Electron X-ray Laser
We are developing cryogenic bolometers to measure the total energy of the Linac Coherent Light Source (LCLS) free electron X-ray laser that is currently being built at the Stanford Linear Accelerator Center. LCLS will produce ultrashort {approx}200 fs X-ray laser pulses with {approx}10{sup 13} photons at 0.8 keV up to {approx}10{sup 12} photons at 8 keV per pulse at a repeat interval as short as 8 ms, and will be accompanied by a halo of spontaneous undulator radiation. Our bolometer consists of a 375 {micro}m thick Si absorber and a Nd{sub 0.67}Sr{sub 0.33}MnO{sub 3} sensor operated at its metal-insulator transition. It will measure the total energy of each pulse with a precision of <1%, and is designed to meet the conflicting requirements of radiation hardness, sensitivity, linearity over a dynamic range of three orders of magnitude, and readout speed compatible with the LCLS pulse rate. Here we discuss bolometer design and fabrication, and the photoresponse of prototype devices to pulsed optical lasers.
Date:
June 14, 2008
Creator:
Drury, O B; Yong, G J; Kolagani, R M; Liang, Y; Gardner, C; Ables, E et al.
Object Type:
Article
System:
The UNT Digital Library
AGS polarized proton operation in run 8.
Dual partial snake scheme has been used for the Brookhaven AGS (Alternating Gradient Synchrotron) polarized proton operation for several years. It has provided polarized proton beams with 1.5 x 10{sup 11} intensity and 65% polarization for RHIC spin program. There is still residual polarization loss. Several schemes such as putting horizontal tune into the spin tune gap, and injection-on-the-fly were tested in the AGS to mitigate the loss. This paper presents the experiment results and analysis.
Date:
June 23, 2008
Creator:
Huang, H.; Ahrens, L.; Bai, M.; Brown, K. A.; Gardner, C.; Glenn, J. W. et al.
Object Type:
Article
System:
The UNT Digital Library
Compendium of Avian Occurrence Information for the Continental Shelf Waters along the Atlantic Coast of the United States: Final Report (Database Section-Seabirds)
This study follows the regulatory requirements by the MMS and FWS in assessing the construction of building and wind turbines effects on marine bird populations.
Date:
July 2009
Creator:
O'Connell, Allan; Gardner, Beth; Gilbert, Andrew & Laurent, Kevin
Object Type:
Text
System:
The UNT Digital Library
Guadalupe-Blanco River Authority of Texas Annual Financial Report: 2005
Annual financial report of the Guadalupe-Blanco River Authority of Texas documenting income, expenditures, and other relevant financial information for fiscal year ending August 31, 2005.
Date:
2006~
Creator:
Guadalupe-Blanco River Authority (Tex.)
Object Type:
Report
System:
The Portal to Texas History
Monte Carlo Advances for the Eolus Asci Project
The Eolus ASCI project includes parallel, 3-D transport simulation for various nuclear applications. The codes developed within this project provide neutral and charged particle transport, detailed interaction physics, numerous source and tally capabilities, and general geometry packages. One such code is MCNPW which is a general purpose, 3-dimensional, time-dependent, continuous-energy Monte Carlo fully-coupled N-Particle transport code. Significant advances are also being made in the areas of modern software engineering and parallel computing. These advances are described in detail.
Date:
January 1, 2000
Creator:
Hendrick, J. S.; Mckinney, G. W. & Cox, L. J.
Object Type:
Article
System:
The UNT Digital Library
Injection Choice for Spallation Neutron Source Ring.
Injection is key in the low-loss design of high-intensity proton facilities like the Spallation Neutron Source (SNS). During the design of both the accumulator and the rapid-cycling-synchrotron version of the SNS, extensive comparison has been made to select injection scenarios that satisfy SNS's low-loss design criteria. This paper presents issues and considerations pertaining to the final choice of the SNS injection systems.
Date:
June 18, 2001
Creator:
Wei, J.; Beebe-Wang, J.; Blaskiewicz, M.; Brodowski, J.; Fedotov, A.; Gardner, C. et al.
Object Type:
Article
System:
The UNT Digital Library
Lattices for High-Power Proton Beam Acceleration and Secondary Beam Collection and Cooling.
Rapid cycling synchrotrons are used to accelerate high-intensity proton beams to energies of tens of GeV for secondary beam production. After primary beam collision with a target, the secondary beam can be collected, cooled, accelerated or decelerated by ancillary synchrotrons for various applications. In this paper, we first present a lattice for the main synchrotron. This lattice has: (a) flexible momentum compaction to avoid transition and to facilitate RF gymnastics (b) long straight sections for low-loss injection, extraction, and high-efficiency collimation (c) dispersion-free straights to avoid longitudinal-transverse coupling, and (d) momentum cleaning at locations of large dispersion with missing dipoles. Then, we present a lattice for a cooler ring for the secondary beam. The momentum compaction across half of this ring is near zero, while for the other half it is normal. Thus, bad mixing is minimized while good mixing is maintained for stochastic beam cooling.
Date:
June 23, 2006
Creator:
Wang, S.; Wei, J.; Brown, K.; Gardner, C.; Lee, Y. Y.; Lowenstein, D. et al.
Object Type:
Article
System:
The UNT Digital Library
Acceleration of Polarized Protons in the AGS With Two Helical Partial Snakes.
Acceleration of polarized protons in the energy range of 5 to 25 GeV is particularly difficult: the depolarizing resonances are strong enough to cause significant depolarization but full Siberian snakes cause intolerably large orbit excursions and are not feasible in the AGS since straight sections are too short. Recently, two helical partial snakes with double pitch design have been built and installed in the AGS. With careful setup of optics at injection and along the ramp, this combination can eliminate the intrinsic and imperfection depolarizing resonances encountered during acceleration. This paper presents the accelerator setup and preliminary results.
Date:
June 26, 2006
Creator:
Huang, H.; Ahrens, L. A.; Bai, M.; Bravar, A.; Brown, K.; Courant, E. D. et al.
Object Type:
Article
System:
The UNT Digital Library
Low Loss Rapid Cycling Synchrotron Design for the Spallation Neutron Source.
None
Date:
June 30, 2000
Creator:
Wei, J.; Beebe-Wang, J.; Blaskiewicz, M.; Brennan, M.; Cameron, P.; Catalan-Lasheras, N. et al.
Object Type:
Article
System:
The UNT Digital Library
Social and Economic Impacts of Outer Continental Shelf Activities on Individuals and Families, Volume 1: Final Report
The final report of a study examining the nature of OCS-related work and its impacts on the lifestyles of individuals and families and on the communities in which they live.
Date:
July 2002
Creator:
Austin, Diane; Coelho, Karen; Gardner, Andrew; Higgins, Rylan & McGuire, Tom
Object Type:
Text
System:
The UNT Digital Library
Texas Attorney General Opinion: JC-307
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, John Cornyn, regarding a legal question submitted for clarification: Whether a criminal violation of the Open Meetings Act, chapter 551 of the Government COde, occurs when a person urges individual members of a commissioners court's agenda or to vote a certain way on an item on the agenda (RQ-0242-JC)
Date:
November 20, 2000
Creator:
Texas. Attorney-General's Office.
Object Type:
Text
System:
The Portal to Texas History
NSRL Energy Loss Calculator
N/A
Date:
August 1, 2006
Creator:
B., Vankuik; Gardner, C.; Bellavia, S.; Rusek, A. & Brown, K.
Object Type:
Report
System:
The UNT Digital Library