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480 Matching Results
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Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 90, No. 48, Ed. 1 Monday, November 8, 2004
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 8, 2004
Creator:
Broaddus, Matthew B.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 90, No. 74, Ed. 1 Wednesday, December 8, 2004
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 8, 2004
Creator:
Broaddus, Matthew B.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Checkpointing Shared Memory Programs at the Application-level
Trends in high-performance computing are making it necessary for long-running applications to tolerate hardware faults. The most commonly used approach is checkpoint and restart(CPR)-the state of the computation is saved periodically on disk, and when a failure occurs, the computation is restarted from the last saved state. At present, it is the responsibility of the programmer to instrument applications for CPR. Our group is investigating the use of compiler technology to instrument codes to make them self-checkpointing and self-restarting, thereby providing an automatic solution to the problem of making long-running scientific applications resilient to hardware faults. Our previous work focused on message-passing programs. In this paper, we describe such a system for shared-memory programs running on symmetric multiprocessors. The system has two components: (i)a pre-compiler for source-to-source modification of applications, and (ii) a runtime system that implements a protocol for coordinating CPR among the threads of the parallel application. For the sake of concreteness, we focus on a non-trivial subset of OpenMP that includes barriers and locks. One of the advantages of this approach is that the ability to tolerate faults becomes embedded within the application itself, so applications become self-checkpointing and self-restarting on any platform. We demonstrate this by …
Date:
September 8, 2004
Creator:
Bronevetsky, Greg; Schulz, Martin; Szwed, Peter; Marques, Daniel & Pingali, Keshav
Object Type:
Article
System:
The UNT Digital Library
[Letter from Eleanor Brown to Elaine, October 8, 2004]
Letter from Eleanor Brown to Elaine discussing her volunteer activities, recent travel, and other news.
Date:
October 8, 2004
Creator:
Brown, Eleanor McLernon
Object Type:
Letter
System:
The Portal to Texas History
Perry Daily Journal (Perry, Okla.), Vol. 111, No. 5, Ed. 1 Thursday, January 8, 2004
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 8, 2004
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Perry Daily Journal (Perry, Okla.), Vol. 111, No. 45, Ed. 1 Monday, March 8, 2004
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 8, 2004
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Perry Daily Journal (Perry, Okla.), Vol. 111, No. 110, Ed. 1 Tuesday, June 8, 2004
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
June 8, 2004
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Perry Daily Journal (Perry, Okla.), Vol. 111, No. 131, Ed. 1 Thursday, July 8, 2004
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 8, 2004
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Perry Daily Journal (Perry, Okla.), Vol. 111, No. 174, Ed. 1 Wednesday, September 8, 2004
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 8, 2004
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Perry Daily Journal (Perry, Okla.), Vol. 111, No. 194, Ed. 1 Friday, October 8, 2004
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
October 8, 2004
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Perry Daily Journal (Perry, Okla.), Vol. 111, No. 234, Ed. 1 Wednesday, December 8, 2004
Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 8, 2004
Creator:
Brown, Gloria
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Canadian Record (Canadian, Tex.), Vol. 114, No. 2, Ed. 1 Thursday, January 8, 2004
Weekly newspaper from Canadian, Texas that includes local, state and national news along with some advertising.
Date:
January 8, 2004
Creator:
Brown, Laurie Ezzell
Object Type:
Newspaper
System:
The Portal to Texas History
The Canadian Record (Canadian, Tex.), Vol. 114, No. 15, Ed. 1 Thursday, April 8, 2004
Weekly newspaper from Canadian, Texas that includes local, state and national news along with some advertising.
Date:
April 8, 2004
Creator:
Brown, Laurie Ezzell
Object Type:
Newspaper
System:
The Portal to Texas History
The Canadian Record (Canadian, Tex.), Vol. 114, No. 28, Ed. 1 Thursday, July 8, 2004
Weekly newspaper from Canadian, Texas that includes local, state and national news along with some advertising.
Date:
July 8, 2004
Creator:
Brown, Laurie Ezzell
Object Type:
Newspaper
System:
The Portal to Texas History
Comparison of the House and Senate ETI/Business Investment Bills (H.R. 4520 and S. 1637, 108th Congress)
In fall 2004, Congress considered legislation that addresses both domestic and international business investment and the long-simmering controversy between the United States and the European Union over the U.S. tax code's extraterritorial income tax benefit for exporting. This report contains information on agreements between the U.S. and the European Union, impact on tax revenues, extraterritorial income benefit for exports, tax benefits restricted to domestic production, and more.
Date:
November 8, 2004
Creator:
Brumbaugh, David L.
Object Type:
Report
System:
The UNT Digital Library
Immigration: Policy Considerations Related to Guest Worker Programs
At present, the United States has two main programs for temporarily importing low-skilled workers, sometimes referred to as guest workers. Agricultural guest workers enter through the H-2A program and other guest workers enter through the H-2B program. Employers interested in importing workers under either program must first apply to the U.S. Labor Department for a certification that U.S. workers capable of performing the work are not available and that the employment of alien workers will not adversely affect the wages and working conditions of similarly employed U.S. workers. Other requirements of the programs differ.
Date:
June 8, 2004
Creator:
Bruno, Andorra
Object Type:
Report
System:
The UNT Digital Library
Ballast Water Management to Combat Invasive Species
This report is on Ballast Water Management to Combat Invasive Species.
Date:
April 8, 2004
Creator:
Buck, Eugene H.
Object Type:
Report
System:
The UNT Digital Library
Fishery, Aquaculture, and Marine Mammal Legislation in the 108th Congress
This report provides information about the Fishery, Aquaculture, and Marine Mammal Legislation in the 108th Congress. fish and marine are important resources in the open ocean and nearshore coastal areas.
Date:
January 8, 2004
Creator:
Buck, Eugene H.
Object Type:
Report
System:
The UNT Digital Library
Fishery, Aquaculture, and Marine Mammal Legislation in the 108th Congress
This report discusses policy and legislation regarding fish and marine mammals. These animals are important resources in open ocean and nearshore coastal areas. Commercial and sport fishing are jointly managed by the federal government and individual states. Many laws and regulations guide the management of these resources by federal agencies.
Date:
October 8, 2004
Creator:
Buck, Eugene H.
Object Type:
Report
System:
The UNT Digital Library
The Magnuson-Stevens Fishery Conservation and Management Act: Reauthorization Issues
None
Date:
September 8, 2004
Creator:
Buck, Eugene H. & Waldeck, Daniel A.
Object Type:
Report
System:
The UNT Digital Library
Statistically meaningful data on the chemical state of ironprecipitates in processed multicrystalline silicon usingsynchrotron-based X-ray absorption spectroscopy
X-ray fluorescence microscopy (mu-XRF), x-ray beam induced current (XBIC), and x-ray absorption spectromicroscopy (mu-XAS) were performed on fully-processed Bay Six cast multicrystalline silicon and aluminum-gettered AstroPower Silicon-Film(TM) sheet material. Over ten iron precipitates--predominantly of iron silicide--were identified at low lifetime regions in both materials, both at grain boundaries and intragranular defects identified by XBIC. In addition, large (micron-sized) particles containing oxidized iron and other impurities (Ca, Cr, Mn) were found in BaySix material. The smaller iron silicide precipitates were more numerous and spatially distributed than their larger oxidized iron counterparts, and thus deemed more detrimental to minority carrier diffusion length.
Date:
November 8, 2004
Creator:
Buonassisi, T.; Heuer, M.; Istratov, A.A.; Weber, E.R.; Cai, Z.; Lai, B. et al.
Object Type:
Article
System:
The UNT Digital Library
Impact of iron contamination in multicrystalline silicon solarcells: origins, chemical states, and device impacts
Synchrotron-based microprobe techniques have been applied to study the distribution, size, chemical state, and recombination activity of Fe clusters in two types of mc-Si materials: block cast mc-Si, and AstroPower Silicon Film(TM) sheet material. In sheet material, high concentrations of metals were found at recombination-active, micron-sized intragranular clusters consisting of micron and sub-micron sized particles. In addition, Fe nanoparticles were located in densities of {approx}2'107 cm-2 along recombination-active grain boundaries. In cast mc-Si,two types of particles were identified at grain boundaries: (1) micron-sized oxidized Fe particles accompanied by other metals (Cr, Mn, Ca, Ti), and (2) a higher number of sub-micron FeSi2 precipitates that exhibited a preferred orientation along the crystal growth direction. In both materials, it is believed that the larger Fe clusters are inclusions of foreign particles, from which Fe dissolves in the melt to form the smaller FeSi2 nanoprecipitates, which by virtue of their more homogeneous distribution are deemed more dangerous to solar cell device performance. Based on this understanding, strategies proposed to reduce the impact of Fe on mc-Si electrical properties include gettering, passivation, and limiting the dissolution of foreign Fe-rich particles in the melt.
Date:
November 8, 2004
Creator:
Buonassisi, Tonio; Heuer, Matthias; Istratov, Andrei A.; Marcus,Matthew A.; Jonczyk, Ralf; Lai, Barry et al.
Object Type:
Article
System:
The UNT Digital Library
Synchrotron-based investigations of the nature and impact of ironcontamination in multicrystalline silicon solar cell materials
Synchrotron-based microprobe techniques were used to obtain precise and systematic information about the size distribution, spatial distribution, shape, electrical activity, and chemical states of iron-rich impurity clusters in multicrystalline silicon materials used for cost-effective solar cells. These experimentally observed properties of iron-rich clusters allow one to derive conclusions about the origins of iron contamination, the mechanisms for incorporating large amounts of Fe into mc-Si, quantitative information about the distribution of Fe in mc-Si and the impacts of such contamination on solar cell performance. Two distinct groups of iron-rich clusters have been identified in both materials: (a) the occasional large (diameter greater than or equal to 1 mu-m) particles, either oxidized and/or present with multiple other metal species reminiscent of stainless steels or ceramics, which are believed to originate from a foreign source such as the growth surfaces, production equipment, or feedstock, and (b) the more numerous, homogeneously distributed, and smaller iron silicide precipitates (dia. less than or equal to 800 nm, often < 100 nm), originating from a variety of possible formation mechanisms involving atomically dissolved iron in the melt or in the crystal. It was found that iron silicide nanoprecipitates account for bulk Fe concentrations as high as 1014-15cm-3 …
Date:
November 8, 2004
Creator:
Buonassisi, Tonio; Istratov, Andrei A.; Heuer, Matthias; Marcus,Matthew A.; Jonczyk, Ralf; Lai, Barry et al.
Object Type:
Article
System:
The UNT Digital Library
Analysis of copper-rich precipitates in silicon: chemical state,gettering, and impact on multicrystalline silicon solar cellmaterial
In this study, synchrotron-based x-ray absorption microspectroscopy (mu-XAS) is applied to identifying the chemical states of copper-rich clusters within a variety of silicon materials, including as-grown cast multicrystalline silicon solar cell material with high oxygen concentration and other silicon materials with varying degrees of oxygen concentration and copper contamination pathways. In all samples, copper silicide (Cu3Si) is the only phase of copper identified. It is noted from thermodynamic considerations that unlike certain metal species, copper tends to form a silicide and not an oxidized compound because of the strong silicon-oxygen bonding energy; consequently the likelihood of encountering an oxidized copper particle in silicon is small, in agreement with experimental data. In light of these results, the effectiveness of aluminum gettering for the removal of copper from bulk silicon is quantified via x-ray fluorescence microscopy (mu-XRF),and a segregation coefficient is determined from experimental data to beat least (1-2)'103. Additionally, mu-XAS data directly demonstrates that the segregation mechanism of Cu in Al is the higher solubility of Cu in the liquid phase. In light of these results, possible limitations for the complete removal of Cu from bulk mc-Si are discussed.
Date:
November 8, 2004
Creator:
Buonassisi, Tonio; Marcus, Matthew A.; Istratov, Andrei A.; Heuer, Matthias; Ciszek, Theodore F.; Lai, Barry et al.
Object Type:
Article
System:
The UNT Digital Library