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506 Matching Results
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A technique for accelerating the convergence of restarted GMRES
We have observed that the residual vectors at the end of each restart cycle of restarted GMRES often alternate direction in a cyclic fashion, thereby slowing convergence. We present a new technique for accelerating the convergence of restarted GMRES by disrupting this alternating pattern. The new algorithm resembles a full conjugate gradient method with polynomial preconditioning, and its implementation requires minimal changes to the standard restarted GMRES algorithm.
Date:
March 9, 2004
Creator:
Baker, A H; Jessup, E R & Manteuffel, T
Object Type:
Article
System:
The UNT Digital Library
Present and Future Surface Climate in the Western U.S. as Simulated by 15 Global Climate Models
We analyze results of 15 global climate simulations contributed to the Coupled Model Intercomparison Project (CMIP). Focusing on the western U.S., we consider both present climate simulations and predicted responses to increasing atmospheric CO{sub 2}. The models vary in their ability to predict the present climate. Over the western U.S., a few models produce a seasonal cycle for spatially-averaged temperature and/or precipitation in good agreement with observational data. Other models tend to overpredict precipitation in the winter or exaggerate the amplitude of the seasonal cycle of temperature. The models also differ in their ability to reproduce the spatial patterns of temperature and precipitation in the U.S. Considering the monthly mean precipitation responses to doubled atmospheric CO{sub 2}, averaged over the western U.S., we find some models predict increases while others predict decreases. The predicted temperature response, on the other hand, is invariably positive over this region; however, for each month, the range of values given by the different models is large compared to the mean model response. We look for possible relationships between the models' temperature and precipitation responses to doubled CO{sub 2} concentration and their ability to simulate some aspects of the present climate. We find that these relationships …
Date:
August 9, 2004
Creator:
Coquard, J; Duffy, P B; Taylor, K E & Iorio, J P
Object Type:
Article
System:
The UNT Digital Library
[Photograph of Rhea playing an acoustic guitar while singing]
Photograph of hip-hop and soul artist, Rhea, playing an acoustic guitar while singing at the Hip-Hop & Soul Cabaret event held in the Muse Theatre by The Black Academy of Arts and Letters in Dallas, Texas. In the background, there are two men standing on stage, near other instruments.
Date:
October 9, 2004
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
[Photograph of hip-hop and soul artist Rhea]
Photograph of hip-hop and soul artist, Rhea, singing into a microphone at the Hip-Hop & Soul Cabaret event held in the Muse Theatre by The Black Academy of Arts and Letters in Dallas, Texas. In the background, there is a man playing a trumpet.
Date:
October 9, 2004
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
[Invitational flyer for the Ultimate Democratic Party]
Invitational flyer for the Ultimate Democratic party hosted by State Representative and Speaker Pro Term Sylvester Turner and State Representative Helen Giddings.
Date:
June 9, 2004
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
[Photograph of two men playing their respective drums on stage]
Photograph of two men playing their respective drums onstage, at the Hip-Hop & Soul Cabaret event held in the Muse Theatre by The Black Academy of Arts and Letters in Dallas, Texas. The man on the left is playing the bongos while the other man is playing drum sets.
Date:
October 9, 2004
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
[Photograph of Rhea singing intensely into the microphone]
Photograph of hip-hop and soul artist, Rhea, singing into a microphone at the Hip-Hop & Soul Cabaret event held in the Muse Theatre by The Black Academy of Arts and Letters in Dallas, Texas. Rhea was photographed with her eyes partially closed and her brows somewhat furrowed.
Date:
October 9, 2004
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
The Albany News (Albany, Tex.), Vol. 129, No. 15, Ed. 1 Thursday, September 9, 2004
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
September 9, 2004
Creator:
Lucas, Melinda L.
Object Type:
Newspaper
System:
The Portal to Texas History
The Albany News (Albany, Tex.), Vol. 129, No. 28, Ed. 1 Thursday, December 9, 2004
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
December 9, 2004
Creator:
Lucas, Melinda L.
Object Type:
Newspaper
System:
The Portal to Texas History
M-theory and E10: Billiards, Branes, and Imaginary Roots
Eleven dimensional supergravity compactified on $T^10$ admits classical solutions describing what is known as billiard cosmology - a dynamics expressible as an abstract (billiard) ball moving in the 10-dimensional root space of the infinite dimensional Lie algebra E10, occasionally bouncing off walls in that space. Unlike finite dimensional Lie algebras, E10 has negative and zero norm roots, in addition to the positive norm roots. The walls above are related to physical fluxes that, in turn, are related to positive norm roots (called real roots) of E10. We propose that zero and negative norm roots, called imaginary roots, are related to physical branes. Adding 'matter' to the billiard cosmology corresponds to adding potential terms associated to imaginary roots. The, as yet, mysterious relation between E10 and M-theory on $T^10$ can now be expanded as follows: real roots correspond to fluxes or instantons, and imaginary roots correspond to particles and branes (in the cases we checked). Interactions between fluxes and branes and between branes and branes are classified according to the inner product of the corresponding roots (again in the cases we checked). We conclude with a discussion of an effective Hamiltonian description that captures some features of M-theory on $T^10.$
Date:
January 9, 2004
Creator:
Brown, Jeffrey; Ganor, Ori J. & Helfgott, Craig
Object Type:
Article
System:
The UNT Digital Library
Iraq: U.S. Military Operations
This report discusses US military operations in Iraq. Iraq's chemical, biological, and nuclear weapons programs, together with Iraqi long-range missile development and support for al-Queda terrorism, were the primary justifications put forward for military action.
Date:
March 9, 2004
Creator:
Bowman, Steve
Object Type:
Report
System:
The UNT Digital Library
Social Security Reform
This report examines the debate over the future of the Social Security system. It includes discussion of recent developments; background and analysis with information about the basic debate, specific area of contention, reform initiatives; and relevant legislation.
Date:
December 9, 2004
Creator:
Nuschler, Dawn
Object Type:
Report
System:
The UNT Digital Library
Archiving Web Browser Plug-ins
This report explores issues related to the archiving of Web Browser Plug-ins.
Date:
January 9, 2004
Creator:
Bang, Sverre
Object Type:
Report
System:
The UNT Digital Library
Iipc Web Archiving Metadata Set
This report presents a set of metadata elements for web archiving.
Date:
November 9, 2004
Creator:
Masanès, Julien
Object Type:
Report
System:
The UNT Digital Library
Annual Growth Bands in Hymenaea courbaril
One significant source of annual temperature and precipitation data arises from the regular annual secondary growth rings of trees. Several tropical tree species are observed to form regular growth bands that may or may not form annually. Such growth was observed in one stem disk of the tropical legume Hymenaea courbaril near the area of David, Panama. In comparison to annual reference {Delta}{sup 14}C values from wood and air, the {Delta}{sup 14}C values from the secondary growth rings formed by H. courbaril were determined to be annual in nature in this one stem disk specimen. During this study, H. courbaril was also observed to translocate recently produced photosynthate into older growth rings as sapwood is converted to heartwood. This process alters the overall {Delta}{sup 14}C values of these transitional growth rings as cellulose with a higher {Delta}{sup 14}C content is translocated into growth rings with a relatively lower {Delta}{sup 14}C content. Once the annual nature of these growth rings is established, further stable isotope analyses on H. courbaril material in other studies may help to complete gaps in the understanding of short and of long term global climate patterns.
Date:
February 9, 2004
Creator:
Westbrook, J. A.; Guilderson, T. P. & Colinvaux, P. A.
Object Type:
Article
System:
The UNT Digital Library
Use of phosphates to reduce slag penetration in Cr2O3-based refractories
A high-chromium refractory material that provides improved resistance to coal slag penetration is presented. The refractory mixture comprises a blend of chromium oxide, aluminum oxide and phosphates. The refractory mixture may be blended with an aggregate and cured. In addition a phosphorous oxide may be blended with chromium oxide and aluminum oxide and additionally an aggregate. The refractory mixture reduces the rate of coal slag penetration into the surface of the cured refractory.
Date:
November 9, 2004
Creator:
Kwong, Kyei-Sing; Dogan, Cynthia P.; Bennett, James P.; Chinn, Richard E. & Petty, Arthur V.
Object Type:
Text
System:
The UNT Digital Library
2004 status report: Savings estimates for the Energy Star(R)voluntarylabeling program
ENERGY STAR(R) is a voluntary labeling program designed toidentify and promote energy-efficient products, buildings and practices.Operated jointly by the Environmental Protection Agency (EPA) and theU.S. Department of Energy (DOE), ENERGY STAR labels exist for more thanthirty products, spanning office equipment, residential heating andcooling equipment, commercial and residential lighting, home electronics,and major appliances. This report presents savings estimates for a subsetof ENERGY STAR labeled products. We present estimates of the energy,dollar and carbon savings achieved by the program in the year 2003, whatwe expect in 2004, and provide savings forecasts for two marketpenetration scenarios for the periods 2004 to 2010 and 2004 to 2020. Thetarget market penetration forecast represents our best estimate of futureENERGY STAR savings. It is based on realistic market penetration goalsfor each of the products. We also provide a forecast under the assumptionof 100 percent market penetration; that is, we assume that all purchasersbuy ENERGY STAR-compliant products instead of standard efficiencyproducts throughout the analysis period.
Date:
March 9, 2004
Creator:
Webber, Carrie A.; Brown, Richard E. & McWhinney, Marla
Object Type:
Report
System:
The UNT Digital Library
Cray X1 Evaluation Status Report
On August 15, 2002 the Department of Energy (DOE) selected the Center for Computational Sciences (CCS) at Oak Ridge National Laboratory (ORNL) to deploy a new scalable vector supercomputer architecture for solving important scientific problems in climate, fusion, biology, nanoscale materials and astrophysics. ''This program is one of the first steps in an initiative designed to provide U.S. scientists with the computational power that is essential to 21st century scientific leadership,'' said Dr. Raymond L. Orbach, director of the department's Office of Science The Cray X1 is an attempt to incorporate the best aspects of previous Cray vector systems and massively-parallel-processing (MPP) systems into one design. Like the Cray T90, the X1 has high memory bandwidth, which is key to realizing a high percentage of theoretical peak performance. Like the Cray T3E, the X1 has a high-bandwidth, low-latency, scalable interconnect, and scalable system software. And, like the Cray SV1, the X1 leverages commodity off-the-shelf (CMOS) technology and incorporates non-traditional vector concepts, like vector caches and multi-streaming processors. In FY03, CCS procured a 256-processor Cray X1 to evaluate the processors, memory subsystem, scalability of the architecture, software environment and to predict the expected sustained performance on key DOE applications codes. The …
Date:
February 9, 2004
Creator:
Vetter, J.S.
Object Type:
Report
System:
The UNT Digital Library
Vibrational Spectroscopy of Fe(OH)2 at High Pressure: Behavior of the O-H Bond
Infrared and Raman spectra of Fe(OH){sub 2}, ''white rust'', were measured between 7 GPa and 21 GPa at ambient temperature. The frequency of the infrared-active A{sub 2u} and of the Raman-active A1g stretching modes of the O-H group decrease linearly with pressure with slopes of -1.3 {+-} 0.1 cm{sup -1}/GPa and -4.9 {+-} 0.2 cm{sup -1}/GPa, respectively. The peak widths of both the infrared-active and Raman-active modes increase non-linearly with pressure, with a discontinuous increase of in broadening between 10 and 12.5 GPa. The overall broadening of the A{sub 2u} and of the A{sub 1g} stretching modes is approximately four-fold in the examined pressure range. The results of this spectroscopic study are compatible with the trends observed in recent neutron diffraction studies in the isostructural Co(OH){sub 2}. Progressive pressure-induced H disordering could be a viable model to interpret both the broadening of the OH stretching mode and the changes in oxidation state of Fe recently observed by Moessbauer spectroscopy.
Date:
November 9, 2004
Creator:
Speziale, S; Jeanloz, R; Milner, A; Pasternak, M P & Zaug, J
Object Type:
Article
System:
The UNT Digital Library
Land Cover Differences in Soil Carbon and Nitrogen at Fort Benning, Georgia
Land cover characterization might help land managers assess the impacts of management practices and land cover change on attributes linked to the maintenance and/or recovery of soil quality. However, connections between land cover and measures of soil quality are not well established. The objective of this limited investigation was to examine differences in soil carbon and nitrogen among various land cover types at Fort Benning, Georgia. Forty-one sampling sites were classified into five major land cover types: deciduous forest, mixed forest, evergreen forest or plantation, transitional herbaceous vegetation, and barren land. Key measures of soil quality (including mineral soil density, nitrogen availability, soil carbon and nitrogen stocks, as well as properties and chemistry of the O-horizon) were significantly different among the five land covers. In general, barren land had the poorest soil quality. Barren land, created through disturbance by tracked vehicles and/or erosion, had significantly greater soil density and a substantial loss of carbon and nitrogen relative to soils at less disturbed sites. We estimate that recovery of soil carbon under barren land at Fort Benning to current day levels under transitional vegetation or forests would require about 60 years following reestablishment of vegetation. Maps of soil carbon and nitrogen …
Date:
February 9, 2004
Creator:
Garten C. T. Jr.
Object Type:
Report
System:
The UNT Digital Library
Finding nonoverlapping substructures of a sparse matrix
Many applications of scientific computing rely on computations on sparse matrices, thus the design of efficient implementations of sparse matrix kernels is crucial for the overall efficiency of these applications. Due to the high compute-to-memory ratio and irregular memory access patterns, the performance of sparse matrix kernels is often far away from the peak performance on a modern processor. Alternative data structures have been proposed, which split the original matrix A into A{sub d} and A{sub s}, so that A{sub d} contains all dense blocks of a specified size in the matrix, and A{sub s} contains the remaining entries. This enables the use of dense matrix kernels on the entries of A{sub d} producing better memory performance. In this work, we study the problem of finding a maximum number of non overlapping rectangular dense blocks in a sparse matrix, which has not been studied in the sparse matrix community. We show that the maximum non overlapping dense blocks problem is NP-complete by using a reduction from the maximum independent set problem on cubic planar graphs. We also propose a 2/3-approximation algorithm for 2 times 2 blocks that runs in linear time in the number of nonzeros in the matrix. We …
Date:
August 9, 2004
Creator:
Pinar, Ali & Vassilevska, Virginia
Object Type:
Article
System:
The UNT Digital Library
[Clipping: 'Sky Girls']
Newspaper clipping discussing Joyce Secciani, a Women Airforce Service Pilot, and her story. It also discusses gender discrimination within the WASP program.
Date:
January 9, 2004
Creator:
unknown
Object Type:
Clipping
System:
The Portal to Texas History
[Clipping: Airplay]
Newspaper clipping from the San Diego Union-Tribune discussing the debut of a new play about five fictional women in the final WASP class, and also focuses on Vivian Eddy and Joyce Secciani who were in the program during World War II.
Date:
January 9, 2004
Creator:
Hebert, James
Object Type:
Clipping
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 109, No. 24, Ed. 1 Friday, April 9, 2004
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
April 9, 2004
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History