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807 Matching Results
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INTRINSIC RESIDUAL STRESSES IN METAL FILMS SYNTHESIZED BY ENERGETIC PARTICLE DEPOSITION
None
Date:
September 15, 2000
Creator:
A. MISRA, M. NASTASI
Object Type:
Article
System:
The UNT Digital Library
The Migration and Entrapment of DNAPLs in Physically and Chemically Heterogeneous Porous Media - Final Report - 09/15/1996 - 09/15/2000
Hazardous dense nonaqueous phase liquids (DNAPLs), such as chlorinated solvents, are slightly water soluble and pose a serious threat to soil and groundwater supplies in many portions of the United States. The migration and entrapment of DNAPLs in the subsurface environment is typically believed to be controlled by physical heterogeneities; i.e, layers and lenses of contrasting soil texture. The rationale for this assumption is that capillarity, as determined by the soil texture, is the dominant transport mechanism. Capillarity also depends on interfacial tension and medium wettability. Interfacial tension and medium wettability may be spatially and temporally dependent due to variations in aqueous phase chemistry, contaminant aging, and/or variations in mineralogy and organic matter distributions. Such chemical heterogeneities have largely been ignored to date, even though they are known to have dramatic effects on the hydraulic property relations. Numerical multiphase flow and transport models typically assume that solids are water-wet and that interfacial tension is constant. The primary objective of this research is to investigate the influence of coupled physical and chemical heterogeneities on the migration and entrapment of DNAPLs. This objective will be accomplished through a combination of laboratory and numerical experiments. Laboratory experiments will be conducted to examine: (i) …
Date:
September 15, 2000
Creator:
Abriola, L. M. & Demond, A. H.
Object Type:
Report
System:
The UNT Digital Library
Collaboration tools for the global accelerator network: Workshop Report
The concept of a ''Global Accelerator Network'' (GAN) has been put forward as a means for inter-regional collaboration in the operation of internationally constructed and operated frontier accelerator facilities. A workshop was held to allow representatives of the accelerator community and of the collaboratory development community to meet and discuss collaboration tools for the GAN environment. This workshop, called the Collaboration Tools for the Global Accelerator Network (GAN) Workshop, was held on August 26, 2002 at Lawrence Berkeley National Laboratory. The goal was to provide input about collaboration tools in general and to provide a strawman for the GAN collaborative tools environment. The participants at the workshop represented accelerator physicists, high-energy physicists, operations, technology tool developers, and social scientists that study scientific collaboration.
Date:
September 15, 2002
Creator:
Agarwal, Deborah; Olson, Gary & Olson, Judy
Object Type:
Report
System:
The UNT Digital Library
The Adiabatic Matching Section Solution for the Source Injector
Typical designs for a Heavy Ion Fusion Power Plant require the source injector to deliver 100 beams, packed into an array with a spacing of 7 cm. When designing source injectors using a single large aperture source for each beam, the emitter surfaces are packed into an array with a spacing of 30 cm. Thus, the matching section of the source injector must not only prepare the beam for transport in a FODO lattice, but also funnel the beams together. This can be accomplished by an ESQ matching section in which each beam travels on average at a slight angle to the axis of the quadrupoles and uses the focusing effect of the FODO lattice to maintain the angle. At the end of the matching section, doublet steering is used to bring the beams parallel to each other for injection into the main accelerator. A specific solution of this type for an 84-beam source injector is presented. PACS: 41.75.Ak,41.85.Ar, 41.85.Ja
Date:
September 15, 2000
Creator:
Ahle, L.; Grote, D. P.; Halaxa, E.; Henestroza, E.; Kwan, J. W. & Mac Laren, S. A.
Object Type:
Article
System:
The UNT Digital Library
Boundary Layer Cloudiness Parameterizations Using ARM Observations
This study used DOE ARM data and facilities to: (1) study macroscopic properties of continental stratus clouds at SGP and the factors controlling these properties, (2) develop a scientific basis for understanding the processes responsible for the formation of boundary layer clouds using ARM observations in conjunction with simple parametric models and LES, and (3) evaluate cumulus cloud characteristics retrieved from the MMCR operating at TWP-Nauru. In addition we have used high resolution 94 GHz observations of boundary layer clouds and precipitation to: (1) develop techniques for using high temporal resolution Doppler velocities to study large-eddy circulations and turbulence in boundary layer clouds and estimate the limitations of using current and past MMCR data for boundary layer cloud studies, (2) evaluate the capability and limitations of the current MMCR data for estimating reflectivity, vertical velocities, and spectral under low- signal-to-noise conditions associated with weak no n-precipitating clouds, (3) develop possible sampling modes for the new MMCR processors to allow for adequate sampling of boundary layer clouds, and (4) retrieve updraft and downdraft structures under precipitating conditions.
Date:
September 15, 2004
Creator:
Albrecht, Bruce
Object Type:
Report
System:
The UNT Digital Library
Analysis of Events Associated with First Charge of Desicooler Material
HB-Line's mission included dissolution of uranium-aluminum scrap left over from a U3O8 scrap recovery program begun in 1972 with material returned from Rocky Flats and Oak Ridge. This material has been stored in desicooler containers, and is commonly referred to as the Desicoolers. The Scrap Recovery process includes the dissolution of scrap material and transfer of the resulting solution to H-Canyon for further disposition. During the first charge of this material into the HB-Line dissolvers, the solution heated to boiling without external heat being added. Yellow-colored fumes, which dissipated rapidly, were noted in the glovebox by operators, and a small amount of liquid was noted in the glovebox by operations after dissolver cooldown. This technical report documents analysis of the data from the event with respect to potential Safety Basis violation and the Integrated Safety Management System process. Based on the analysis presented, the safety basis has shown its ability to protect the worker, the facility and the public.
Date:
September 15, 2003
Creator:
Alexander, D. E.
Object Type:
Report
System:
The UNT Digital Library
Timpson & Tenaha News (Timpson, Tex.), Vol. 20, No. 37, Ed. 1 Thursday, September 15, 2005
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
September 15, 2005
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Control Rod Studies for Enigma Configurations.
None
Date:
September 15, 2006
Creator:
Aliberti, G.; Taiwo, T. A.; Palmiotti, G.; Tommasi, J. & Jacqmin,R.
Object Type:
Report
System:
The UNT Digital Library
The use of microarrays in microbial ecology
Microarrays have proven to be a useful and high-throughput method to provide targeted DNA sequence information for up to many thousands of specific genetic regions in a single test. A microarray consists of multiple DNA oligonucleotide probes that, under high stringency conditions, hybridize only to specific complementary nucleic acid sequences (targets). A fluorescent signal indicates the presence and, in many cases, the abundance of genetic regions of interest. In this chapter we will look at how microarrays are used in microbial ecology, especially with the recent increase in microbial community DNA sequence data. Of particular interest to microbial ecologists, phylogenetic microarrays are used for the analysis of phylotypes in a community and functional gene arrays are used for the analysis of functional genes, and, by inference, phylotypes in environmental samples. A phylogenetic microarray that has been developed by the Andersen laboratory, the PhyloChip, will be discussed as an example of a microarray that targets the known diversity within the 16S rRNA gene to determine microbial community composition. Using multiple, confirmatory probes to increase the confidence of detection and a mismatch probe for every perfect match probe to minimize the effect of cross-hybridization by non-target regions, the PhyloChip is able to …
Date:
September 15, 2009
Creator:
Andersen, G. L.; He, Z.; DeSantis, T. Z.; Brodie, E. L. & Zhou, J.
Object Type:
Book
System:
The UNT Digital Library
Perrhenate and Pertechnetate Behavior on Iron and Sulfur-Bearing Compounds.
Investigations on the behavior of the radioactive element technetium frequently use a stable isotope of rhenium as an analogue. This is justified by citing the elements similar radii and major oxidation states of +7 and +4. However, at least one study [1] has shown this analogy to be imperfect. Therefore, one goal of our study is to compare the adsorption behavior of perrhenate and pertechnetate (the major forms of Re and Tc in natural waters) on a number of different mineral surfaces. Quantum mechanical calculations were performed on the adsorption of these two anions on a series of iron oxides and sulfides. With these calculations, we gain insight into any differences between the anions adsorption behavior, including geometry, adsorption energies, and electronic structure such as density of states and orbital shapes and energies at the adsorption site. Differences between interactions on terraces and step edges, the effects of co-adsorbates such as Na{sup +} or H{sup +}, and possible reduction mechanisms are also explored. The influence of water was calculated using homogeneous dielectric fluids and explicit water molecules. As a complement to the calculations, batch sorption tests are in progress involving ReO{sub 4}{sup -}/TcO{sub 4}{sup -} solution in contact with Fe …
Date:
September 15, 2006
Creator:
Anderson, B. E.; Becker, U.; Helean, K. B. & Ewing, R. C.
Object Type:
Report
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 105, No. 154, Ed. 1 Monday, September 15, 2003
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 15, 2003
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 106, No. 143, Ed. 1 Wednesday, September 15, 2004
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 15, 2004
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 107, No. 142, Ed. 1 Thursday, September 15, 2005
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 15, 2005
Creator:
Andrews, Mike
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Amish Quilt and Baked Goods Sale
Photograph of a scene during the Amish Quilt and Baked Goods Sale.
Date:
September 15, 2003
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Amish Quilt and Baked Goods Sale
Photograph of a scene during the Amish Quilt and Baked Goods Sale.
Date:
September 15, 2003
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Amish Quilt and Baked Goods Sale
Photograph of a scene during the Amish Quilt and Baked Goods Sale.
Date:
September 15, 2003
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Amish Quilt and Baked Goods Sale
Photograph of a scene during the Amish Quilt and Baked Goods Sale.
Date:
September 15, 2003
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Amish Quilt and Baked Goods Sale
Photograph of a scene during the Amish Quilt and Baked Goods Sale.
Date:
September 15, 2003
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Amish Quilt and Baked Goods Sale
Photograph of a scene during the Amish Quilt and Baked Goods Sale.
Date:
September 15, 2003
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Amish Quilt and Baked Goods Sale
Photograph of a scene during the Amish Quilt and Baked Goods Sale.
Date:
September 15, 2003
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Amish Quilt and Baked Goods Sale
Photograph of a scene during the Amish Quilt and Baked Goods Sale.
Date:
September 15, 2003
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Amish Quilt and Baked Goods Sale
Photograph of a scene during the Amish Quilt and Baked Goods Sale.
Date:
September 15, 2003
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Amish Quilt and Baked Goods Sale
Photograph of a scene during the Amish Quilt and Baked Goods Sale.
Date:
September 15, 2003
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Amish Quilt and Baked Goods Sale
Photograph of a scene during the Amish Quilt and Baked Goods Sale.
Date:
September 15, 2003
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History