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492 Matching Results
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Optical Switching in VO2 films by below-gap excitation
We study the photo-induced insulator-metal transition in VO2, correlating threshold and dynamic evolution with excitation wavelength. In high-quality single crystal samples, we find that switching can only be induced with photon energies above the 670-meV gap. This contrasts with the case of polycrystalline films, where formation of the metallic state can also be triggered with photon energies as low as 180 meV, well below the bandgap. Perfection of this process may be conducive to novel schemes for optical switches, limiters and detectors, operating at room temperature in the mid-IR.
Date:
March 14, 2008
Creator:
Dipartimento di Fisica, Universita?di Brescia, Italy
Object Type:
Article
System:
The UNT Digital Library
Spontaneous Superlattice Formation in Nanorods through PartialCation Exchange
Lattice mismatch strains are widely known to controlnanoscale pattern formation in heteroepitaxy, but such effects have notbeen exploited in colloidal nanocrystal growth. We demonstrate acolloidal route to synthesizing CdS-Ag2S nanorod superlattices throughpartial cation exchange. Strain induces the spontaneous formation ofperiodic structures. Ab initio calculations of the interfacial energy andmodeling of strain energies show that these forces drive theself-organization. The nanorod superlattices exhibit high stabilityagainst ripening and phase mixing. These materials are tunablenear-infrared emitters with potential applications as nanometer-scaleoptoelectronic devices.
Date:
March 14, 2007
Creator:
Robinson, Richard D.; Sadtler, Bryce; Demchenko, Denis O.; Erdonmez, Can K.; Wang, Lin-Wang & Alivisatos, A. Paul
Object Type:
Article
System:
The UNT Digital Library
Spectroscopic Characterization and Simulation of Chemical Sputtering Using the DiMES Porous Plug Injector in DIII-D
None
Date:
March 14, 2007
Creator:
McLean, A. G.; Davis, J. W.; Stangeby, P. C.; Brooks, N. H.; Whyte, D. G.; Allen, S. L. et al.
Object Type:
Article
System:
The UNT Digital Library
Searching for Gluinos at the Tevatron
This letter describes how to perform model-independent searches for new pair-produced color octet particles that each subsequently decay into two jets plus missing energy at the Tevatron. Current searches are not sensitive to all regions of parameter space because they employ CMSSM-motivated cuts. Optimizing the H{sub T} and E{sub T} cuts expands the sensitivity of searches for all kinematically allowed decays.
Date:
March 14, 2008
Creator:
Alwall, Johan; Le, My-Phuong; Lisanti, Mariangela; Wacker, Jay G. & /SLAC /Stanford U., Phys. Dept.
Object Type:
Article
System:
The UNT Digital Library
Modeling the Cathodic Region in Crevice Corrosion Under a Thin Electrolyte Film Including Particulates
Crevice corrosion may be limited by the capacity of the external cathodic region to support anodic dissolution currents within the crevice. The analysis here focuses on behavior of metal surfaces covered by a thin ({approx}microns) layer of the electrolyte film including particulates. The particulates can affect the cathode current capacity (I{sub total}) by increasing the solution resistance (''volume effect'') and by decreasing the electrode area (''surface effect''). In addition, there can be particulate effects on oxygen reduction kinetics and oxygen transport. This work simulates and characterizes the effect of a uniform particulate monolayer on the cathode current capacity for steady state conditions in the presence of a thin electrolyte film. Particulate configurations with varying particle size, shape, arrangement, volume fraction, and electrode area coverage were numerically modeled as a function of the properties of the system. It is observed that the effects of particles can be fully accounted for in terms of two corrections: the volume blockage effect on the electrolyte resistivity can be correlated using Bruggeman's equation, and the electrode coverage effect can be modeled in terms of a simple area correction to the kinetics expression. For the range of parameters analyzed, applying these two correction factors, cathodes covered …
Date:
March 14, 2006
Creator:
Agarwal, A. S.; Landau, U.; Shan, X. & Payer, J. H.
Object Type:
Report
System:
The UNT Digital Library
Distributed Fiber Optic Gas Sensing for Harsh Environment
This report summarizes work to develop a novel distributed fiber-optic micro-sensor that is capable of detecting common fossil fuel gases in harsh environments. During the 32-month research and development (R&D) program, GE Global Research successfully synthesized sensing materials using two techniques: sol-gel based fiber surface coating and magnetron sputtering based fiber micro-sensor integration. Palladium nanocrystalline embedded silica matrix material (nc-Pd/Silica), nanocrystalline palladium oxides (nc-PdO{sub x}) and palladium alloy (nc-PdAuN{sub 1}), and nanocrystalline tungsten (nc-WO{sub x}) sensing materials were identified to have high sensitivity and selectivity to hydrogen; while the palladium doped and un-doped nanocrystalline tin oxide (nc-PdSnO{sub 2} and nc-SnO{sub 2}) materials were verified to have high sensitivity and selectivity to carbon monoxide. The fiber micro-sensor comprises an apodized long-period grating in a single-mode fiber, and the fiber grating cladding surface was functionalized by above sensing materials with a typical thickness ranging from a few tens of nanometers to a few hundred nanometers. GE found that the morphologies of such sensing nanomaterials are either nanoparticle film or nanoporous film with a typical size distribution from 5-10 nanometers. nc-PdO{sub x} and alloy sensing materials were found to be highly sensitive to hydrogen gas within the temperature range from ambient to 150 …
Date:
March 14, 2008
Creator:
Wu, Juntao
Object Type:
Report
System:
The UNT Digital Library
Investigations of the Rayleigh-Taylor and Richtmyer-Meshkov Instabilities
The present program is centered on the experimental study of shock-induced interfacial fluid instabilities. Both 2-D (near-sinusoids) and 3-D (spheres) initial conditions are studied in a large, vertical square shock tube facility. The evolution of the interface shape, its distortion, the modal growth rates and the mixing of the fluids at the interface are all objectives of the investigation. In parallel to the experiments, calculations are performed using the Raptor code, on platforms made available by LLNL. These flows are of great relevance to both ICF and stockpile stewardship. The involvement of four graduate students is in line with the national laboratories' interest in the education of scientists and engineers in disciplines and technologies consistent with the labs' missions and activities.
Date:
March 14, 2008
Creator:
Bonazza, Riccardo; Anderson, Mark & Oakley, Jason
Object Type:
Report
System:
The UNT Digital Library
Remaining Sites Verification Package for the 1607-F1 Sanitary Sewer System (124-F-1) and the 100-F-26:8 (1607-F1) Sanitary Sewer Pipelines Waste Sites, Waste Site Reclassification Form 2004-130
The 1607-F1 Sanitary Sewer System (124-F-1), consisted of a septic tank, drain field, and associated pipelines that received sanitary waste water from the 1701-F Gatehouse, 1709-F Fire Station, and the 1720-F Administrative Office via the 100-F-26:8 pipelines. The septic tank required remedial action based on confirmatory sampling. In accordance with this evaluation, the verification sampling results support a reclassification of this site to Interim Closed Out. The results of verification sampling show that residual contaminant concentrations do not preclude any future uses and allow for unrestricted use of shallow zone soils. The results also demonstrate that residual contaminant concentrations are protective of groundwater and the Columbia River.
Date:
March 14, 2008
Creator:
Dittmer, L. M.
Object Type:
Report
System:
The UNT Digital Library
Pyramid Lake Renewable Energy Project
The Pyramid Lake Paiute Tribe is a federally recognized Tribe residing on the Pyramid Lake Reservation in western Nevada. The funding for this project was used to identify blind geothermal systems disconnected from geothermal sacred sites and develop a Tribal energy corporation for evaluating potential economic development for profit.
Date:
March 14, 2008
Creator:
Jackson, John
Object Type:
Report
System:
The UNT Digital Library
Remaining Sites Verification Package for the 1607-F1 Sanitary Sewer System (124-F-1) and the 100-F-26:8 (1607-F1) Sanitary Sewer Pipelines Waste Sites, Waste Site Reclassification Form 2005-004
The 100-F-26:8 waste site consisted of the underground pipelines that conveyed sanitary waste water from the 1701-F Gatehouse, 1709-F Fire Station, and the 1720-F Administrative Office to the 1607-F1 septic tank. The site has been remediated and presently exists as an open excavation. In accordance with this evaluation, the verification sampling results support a reclassification of this site to Interim Closed Out. The results of verification sampling demonstrated that residual contaminant concentrations do not preclude any future uses and allow for unrestricted use of shallow zone soils. The results also showed that residual contaminant concentrations are protective of groundwater and the Columbia River.
Date:
March 14, 2008
Creator:
Dittmer, L. M.
Object Type:
Report
System:
The UNT Digital Library
Low-Temperature Martensitic and Pressure-Induced Delta to Alpha-Prime Phase Transformations in a Pu-Ga Alloy
None
Date:
March 14, 2008
Creator:
Schwartz, A J; Wall, M A; Farber, D L; Moore, K T & Blobaum, K M
Object Type:
Article
System:
The UNT Digital Library
Solving a million equations
None
Date:
March 14, 2008
Creator:
Decker, D
Object Type:
Report
System:
The UNT Digital Library
Greensheet (Houston, Tex.), Vol. 37, No. 62, Ed. 1 Tuesday, March 14, 2006
Free weekly newspaper that includes business and classified advertising.
Date:
March 14, 2006
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 39, No. 70, Ed. 1 Friday, March 14, 2008
Free weekly newspaper that includes business and classified advertising.
Date:
March 14, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Voting in the Senate: Forms and Requirements
This report provides an overview of the forms and requirements needed in voting in the Senate.
Date:
March 14, 2008
Creator:
Oleszek, Walter
Object Type:
Report
System:
The UNT Digital Library
Greensheet (Houston, Tex.), Vol. 39, No. 72, Ed. 1 Friday, March 14, 2008
Free weekly newspaper that includes business and classified advertising.
Date:
March 14, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 38, No. 66, Ed. 1 Wednesday, March 14, 2007
Free weekly newspaper that includes business and classified advertising.
Date:
March 14, 2007
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Bogata News (Bogata, Tex.), Vol. 91, No. 42, Ed. 1 Thursday, March 14, 2002
Weekly newspaper from Bogata, Texas that includes local, state, and national news along with advertising.
Date:
March 14, 2002
Creator:
Nichols, Nanalee & Nichols, Thomas
Object Type:
Newspaper
System:
The Portal to Texas History
The Ranger (San Antonio, Tex.), Vol. 82, No. 19, Ed. 1 Friday, March 14, 2008
Weekly student newspaper from San Antonio College in San Antonio, Texas that includes campus news along with advertising.
Date:
March 14, 2008
Creator:
San Antonio College
Object Type:
Newspaper
System:
The Portal to Texas History
Cherokeean Herald (Rusk, Tex.), Vol. 158, No. 3, Ed. 1 Wednesday, March 14, 2007
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
March 14, 2007
Creator:
Whitehead, Marie
Object Type:
Newspaper
System:
The Portal to Texas History
Scene: North Texas Daily (Denton, Tex.), Vol. 91, No. 36, Ed. 1 Friday, March 14, 2008
Weekly magazine edition of the daily student newspaper from the University of North Texas in Denton, Texas that includes local, state and campus news along with advertising.
Date:
March 14, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
North Texas Daily (Denton, Tex.), Vol. 91, No. 86, Ed. 1 Wednesday, March 14, 2007
Daily student newspaper from the University of North Texas in Denton, Texas that includes local, state and campus news along with advertising.
Date:
March 14, 2007
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
78th Texas Legislature, Regular Session, House Concurrent Resolution 65
Concurrent resolution introduced by the Texas House of Representatives and Senate relating to welcoming members of the Mt. Pleasant Leadership Group to the State Capitol.
Date:
March 14, 2003
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
Dallas Voice (Dallas, Tex.), Vol. 24, No. 42, Ed. 1 Friday, March 14, 2008
Weekly newspaper from Dallas, Texas that includes local, state, and national news and advertising of interest to the Lesbian, Gay, Bisexual, and Transgender (LGBT) community.
Date:
March 14, 2008
Creator:
Nash, Tammye
Object Type:
Newspaper
System:
The UNT Digital Library