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571 Matching Results
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The Altus Times (Altus, Okla.), Vol. 110, No. 108, Ed. 1 Wednesday, December 10, 2008
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 10, 2008
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
A balancing domain decomposition method by constraints for advection-diffusion problems
The balancing domain decomposition methods by constraints are extended to solving nonsymmetric, positive definite linear systems resulting from the finite element discretization of advection-diffusion equations. A pre-conditioned GMRES iteration is used to solve a Schur complement system of equations for the subdomain interface variables. In the preconditioning step of each iteration, a partially sub-assembled finite element problem is solved. A convergence rate estimate for the GMRES iteration is established, under the condition that the diameters of subdomains are small enough. It is independent of the number of subdomains and grows only slowly with the subdomain problem size. Numerical experiments for several two-dimensional advection-diffusion problems illustrate the fast convergence of the proposed algorithm.
Date:
December 10, 2008
Creator:
Tu, Xuemin & Li, Jing
Object Type:
Article
System:
The UNT Digital Library
Band Structure Asymmetry of Bilayer Graphene Revealed by Infrared Spectroscopy
We report on infrared spectroscopy of bilayer graphene integrated in gated structures. We observe a significant asymmetry in the optical conductivity upon electrostatic doping of electrons and holes. We show that this finding arises from a marked asymmetry between the valence and conduction bands, which is mainly due to the inequivalence of the two sublattices within the graphene layer and the next-nearest-neighbor interlayer coupling. From the conductivity data, the energy difference of the two sublattices and the interlayer coupling energy are directly determined.
Date:
December 10, 2008
Creator:
Li, Z. Q.; Henriksen, E. A.; Jiang, Z.; Hao, Zhao; Martin, Michael C.; Kim, P. et al.
Object Type:
Article
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 88, No. 343, Ed. 1 Wednesday, December 10, 2008
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
December 10, 2008
Creator:
Clements, Clifford E.
Object Type:
Newspaper
System:
The Portal to Texas History
BDDC for nonsymmetric positive definite and symmetric indefinite problems
The balancing domain decomposition methods by constraints are extended to solving both nonsymmetric, positive definite and symmetric, indefinite linear systems. In both cases, certain nonstandard primal constraints are included in the coarse problems of BDDC algorithms to accelerate the convergence. Under the assumption that the subdomain size is small enough, a convergence rate estimate for the GMRES iteration is established that the rate is independent of the number of subdomains and depends only slightly on the subdomain problem size. Numerical experiments for several two-dimensional examples illustrate the fast convergence of the proposed algorithms.
Date:
December 10, 2008
Creator:
Tu, Xuemin & Li, Jing
Object Type:
Article
System:
The UNT Digital Library
Cherokeean Herald (Rusk, Tex.), Vol. 159, No. 42, Ed. 1 Wednesday, December 10, 2008
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
December 10, 2008
Creator:
Whitehead, Marie
Object Type:
Newspaper
System:
The Portal to Texas History
China-U.S. Trade Issues
This report mainly focuses on China-U.S. Trade Issues. China-U.S. ties have been substantially expanded over the past three decades. U.S imports from China have risen much more rapidly than the U.S exports to China.
Date:
December 10, 2008
Creator:
Morrison, Wayne M.
Object Type:
Report
System:
The UNT Digital Library
The Clifton Record (Clifton, Tex.), Vol. 113, No. 50, Ed. 1 Wednesday, December 10, 2008
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
December 10, 2008
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Colony Courier-Leader (The Colony, Tex.), Vol. 27, No. 45, Ed. 1 Wednesday, December 10, 2008
Weekly newspaper from The Colony, Texas that includes local, state, and national news along with advertising.
Date:
December 10, 2008
Creator:
Monk, Devin
Object Type:
Newspaper
System:
The Portal to Texas History
Complexation of Lanthanides with Nitrate at Variable Temperatures: Thermodynamics and Coordination Modes
Complexation of neodymium(III) with nitrate was studied at variable temperatures (25, 40, 55 and 70 C) by spectrophotometry and microcalorimetry. The NdNO{sub 3}{sup 2+} complex is weak and becomes slightly stronger as the temperature is increased. The enthalpy of complexation at 25 C was determined by microcalorimetry to be small and positive, (1.5 {+-} 0.2) kJ {center_dot} mol{sup -1}, in good agreement with the trend of the stability constant at variable temperatures. Luminescence emission spectra and lifetime of Eu(III) in nitrate solutions suggest that inner-sphere and bidentate complexes form between trivalent lanthanides (Nd{sup 3+} and Eu{sup 3+}) and nitrate in aqueous solutions. Specific Ion Interaction approach (SIT) was used to obtain the stability constants of NdNO{sub 3}{sup 2+} at infinite dilution and variable temperatures.
Date:
December 10, 2008
Creator:
Rao, Linfeng & Tian, Guoxin
Object Type:
Article
System:
The UNT Digital Library
Convergence analysis of a balalncing domain decomposition method for solving interior Helmholtz equations
A variant of balancing domain decomposition method by constraints (BDDC) is proposed for solving a class of indefinite system of linear equations, which arises from the finite element discretization of the Helmholtz equation of time-harmonic wave propagation in a bounded interior domain. The proposed BDDC algorithm is closely related to the dual-primal finite element tearing and interconnecting algorithm for solving Helmholtz equations (FETI-DPH). Under the condition that the diameters of the subdomains are small enough, the rate of convergence is established which depends polylogarithmically on the dimension of the individual subdomain problems and which improves with the decrease of the subdomain diameters. These results are supported by numerical experiments of solving a Helmholtz equation on a two-dimensional square domain.
Date:
December 10, 2008
Creator:
Li,Jing & Tu, Xuemin
Object Type:
Article
System:
The UNT Digital Library
Couse/Tenmile Creeks Watershed Project Implementation : 2007 Conservtion Projects. [2007 Habitat Projects Completed].
The Asotin County Conservation District (ACCD) is the primary entity coordinating habitat projects on private lands within Asotin County watersheds. The Tenmile Creek watershed is a 42 square mile tributary to the Snake River, located between Asotin Creek and the Grande Ronde River. Couse Creek watershed is a 24 square mile tributary to the Snake River, located between Tenmile Creek and the Grande Ronde River. Both watersheds are almost exclusively under private ownership. The Washington Department of Fish and Wildlife has documented wild steelhead and rainbow/redband trout spawning and rearing in Tenmile Creek and Couse Creek. The project also provides Best Management Practice (BMP) implementation throughout Asotin County, but the primary focus is for the Couse and Tenmile Creek watersheds. The ACCD has been working with landowners, Bonneville Power Administration (BPA), Washington State Conservation Commission (WCC), Natural Resource Conservation Service (NRCS), Farm Service Agency (FSA), Salmon Recovery Funding Board (SRFB), Washington Department of Fish and Wildlife (WDFW), U.S. Forest Service, Pomeroy Ranger District (USFS), Nez Perce Tribe (NPT), Washington Department of Ecology (DOE), National Marine Fisheries Service (NOAA Fisheries), and U.S. Fish and Wildlife Service (USFWS) to address habitat projects in Asotin County. The Asotin Subbasin Plan identified priority areas …
Date:
December 10, 2008
Creator:
District, Asotin County Conservation
Object Type:
Report
System:
The UNT Digital Library
Development of ZnO:Ga as an Ultrafast Scintillator
We report on several methods for synthesizing the ultra-fast scintillator ZnO(Ga), and measurements of the resulting products. This material has characteristics that make it an excellent alpha detector for tagging the time and direction of individual neutrons produced by t-d and d-d neutron generators (associated particle imaging). The intensity and decay time are strongly dependent on the method used for dopant incorporation. We compare samples made by diffusion of Ga metal to samples made by solid state reaction between ZnO and Ga2O3 followed by reduction in hydrogen. The latter is much more successful and has a pure, strong near-band-edge fluorescence and an ultra-fast decay time of the x-ray-excited luminescence. The luminescence increases dramatically as the temperature is reduced to 10K. We also present results of an alternate low-temperature synthesis that produces luminescent particles with a more uniform size distribution. We examine possible mechanisms for the bright near-band-edge scintillation and favor the explanation that it is due to the recombination of Ga3+ donor electrons with ionization holes trapped on H+ ion acceptors.
Date:
December 10, 2008
Creator:
Bourret-Courchesne, E. D.; Derenzo, S. E. & Weber, M. J.
Object Type:
Article
System:
The UNT Digital Library
Disturbance of isotope systematics in meteorites during shock and thermal metamorphism and implications for shergottite chronology
Shock and thermal metamorphism of meteorites from differentiated bodies such as the Moon and Mars have the potential to disturb chronometric information contained in these meteorites. In order to understand the impact-related mechanisms and extent of disturbance to isochrons, we undertook experiments to shock and heat samples of 10017, a 3.6 billion year old lunar basalt. One sub-sample was shocked to 55 GPa, a second subsample was heated to 1000 C for one week, and a third sub-sample was maintained as a control sample. Of the isotope systems analyzed, the Sm-Nd system was the least disturbed by shock or heat, followed by the Rb-Sr system. Ages represented by the {sup 238}U-{sup 206}Pb isotope system were degraded by shock and destroyed with heating. In no case did either shock or heating alone result in rotated or reset isochrons that represent a spurious age. In some cases the true crystallization age of the sample was preserved, and in other cases age information was degraded or destroyed. Although our results show that neither shock nor thermal metamorphism alone can account for the discordant ages represented by different isotope systems in martian meteorites, we postulate that shock metamorphism may render a meteorite more susceptible …
Date:
December 10, 2008
Creator:
Gaffney, Amy M.; Borg, Lars E. & Asmerom, Yemane
Object Type:
Article
System:
The UNT Digital Library
The Express-Star (Chickasha, Okla.), Ed. 1 Wednesday, December 10, 2008
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 10, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Freedom of Speech and Press: Exceptions to the First Amendment
This report provides an overview of the major exceptions to the First Amendment.
Date:
December 10, 2008
Creator:
Cohen, Henry
Object Type:
Report
System:
The UNT Digital Library
Georgia (Republic): Recent Developments and U.S. Interests
This report discusses the information related to recent developments and U.S interests in Georgia.
Date:
December 10, 2008
Creator:
Nichol, Jim
Object Type:
Report
System:
The UNT Digital Library
The Goldthwaite Eagle (Goldthwaite, Tex.), Vol. 115, No. 23, Ed. 1 Wednesday, December 10, 2008
Weekly newspaper from Goldthwaite, Texas that includes local, state, and national news along with extensive advertising.
Date:
December 10, 2008
Creator:
Bridges, Steven W.
Object Type:
Newspaper
System:
The Portal to Texas History
The Greensheet (Dallas, Tex.), Vol. 32, No. 246, Ed. 1 Wednesday, December 10, 2008
Free weekly newspaper that includes business and classified advertising.
Date:
December 10, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 39, No. 532, Ed. 1 Wednesday, December 10, 2008
Free weekly newspaper that includes business and classified advertising.
Date:
December 10, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 39, No. 533, Ed. 1 Wednesday, December 10, 2008
Free weekly newspaper that includes business and classified advertising.
Date:
December 10, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 39, No. 534, Ed. 1 Wednesday, December 10, 2008
Free weekly newspaper that includes business and classified advertising.
Date:
December 10, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Holiday schedules for DART and TRE announced
News release about DART's adjusted service schedule in observance of the Christmas and New Year's holidays.
Date:
December 10, 2008
Creator:
Lyons, Morgan & Ball, Mark
Object Type:
Text
System:
The Portal to Texas History
Horse Slaughter Prevention Bills and Issues
This report focuses on horse slaughter prevention bills and issues, and how they are implemented or enforced.
Date:
December 10, 2008
Creator:
Becker, Geoffrey S.
Object Type:
Report
System:
The UNT Digital Library