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12
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100
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91
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50
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Degree Department
Country
Year
Month
Day
Language
Fabrication of a Carbon Nanotube-Embedded Silicon Nitride Membrane for Studies of Nanometer-Scale Mass Transport
A membrane consisting of multiwall carbon nanotubes embedded in a silicon nitride matrix was fabricated for fluid mechanics studies on the nanometer scale. Characterization by tracer diffusion and scanning electron microscopy suggests that the membrane is free of large voids. An upper limit to the diffusive flux of D{sub 2}O of 2.4x10-{sup 8} mole/m{sup 2}-s was determined, indicating extremely slow transport. By contrast, hydrodynamic calculations of water flow across a nanotube membrane of similar specifications predict a much higher molar flux of 1.91 mole/m{sup 2}-s, suggesting that the nanotubes produced possess a 'bamboo' morphology. The carbon nanotube membranes were used to make nanoporous silicon nitride membranes, fabricated by sacrificial removal of the carbon. Nitrogen flow measurements on these structures give a membrane permeance of 4.7x10{sup -4} mole/m{sup 2}-s-Pa at a pore density of 4x10{sup 10} cm{sup -2}. Using a Knudsen diffusion model, the average pore size of this membrane is estimated to be 66 nm, which agrees well with TEM observations of the multiwall carbon nanotube outer diameter. These membranes are a robust platform for the study of confined molecular transport, with applications inseparations and chemical sensing.
Date:
August 25, 2004
Creator:
Holt, J K; Noy, A; Huser, T; Eaglesham, D & Bakajin, O
Object Type:
Article
System:
The UNT Digital Library
Perchlorate Contamination of Drinking Water: Regulatory Issues and Legislative Actions
None
Date:
October 25, 2004
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Space Launch Vehicles: Government Activities, Commercial Competition, and Satellite Exports
This report includes information regarding space launch vehicles. Launch vehicle policy, vehicle programs and issues, and the U.S. commercial launch service industry are among topics discussed in this report.
Date:
June 25, 2004
Creator:
Smith, Marcia S.
Object Type:
Report
System:
The UNT Digital Library
Laser Wakefield Acceleration Driven by Atf co2 Laser (Stella-Lw).
A new experiment has begun that builds upon the successful Staged Electron Laser Acceleration (STELLA) experiment, which demonstrated high-trapping efficiency and narrow energy spread in a staged laser-driven accelerator. STELLA was based upon inverse free electron lasers (IFEL); the new experiment, called STELLA-LW, is based upon laser wakefield acceleration (LWFA). The first phase of STELLA-LW will be to demonstrate LWFA in a capillary discharge driven by the Brookhaven National Laboratory Accelerator Test Facility (ATF) terawatt CO{sub 2} laser beam. This will be the first time LWFA is conducted at 10.6-{micro}m laser wavelength. It will also be operating in an interesting pseudo-resonant regime where the laser pulse length is too long for resonant LWFA, but too short for self-modulated LWFA. Analysis has shown that in pseudo-resonant LWFA, pulse-steepening effects occur on the laser pulse that permits generation of strong wakefields. Various approaches are being explored for the capillary discharge including polypropylene and hydrogen-filled capillaries. Planned diagnostics for the experiment include coherent Thomson scattering (CTS) to detect the wakefield generation. This will be one of the first times CTS is used on a capillary discharge.
Date:
September 25, 2004
Creator:
Kimura,W. D.; Andreev,N. E.; Babzien,M.; Ben-Zvi, Ilan & Al., Et
Object Type:
Article
System:
The UNT Digital Library
Texas Stonewall Democratic Caucus Stonewall Supply Inventory
Stonewall supply inventory listing items and quantities of materials.
Date:
June 25, 2004
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
[Letter from Philip A. Berkebile to Darrell Coleman, October 25, 2004]
Letter from Philip A. Berkebile, Executive Vice President at TDNA, to Darrell Colemen, President and Publisher at Wichita Falls Times Record News, on October 25, 2004. The letter is in regards to a prior conversation between Wesley R. Turner and Coleman, in which Coleman accepted his nomination for the TDNA board of directors if offered by the 2005 nomination committee. The nomination committee met and formally nominated Coleman to be one of the four recommended candidates for election.
Date:
October 25, 2004
Creator:
Berkebile, Philip A.
Object Type:
Letter
System:
The UNT Digital Library
[Letter from Philip A. Berkebile to Charles A. Spence, October 25, 2004]
Letter from Philip A. Berkebile, Executive Vice President at TDNA, to Charles A. Spence, Publisher at The Midland Reporter-Telegram, on October 25, 2004. The letter is in regards to a prior correspondence between Wesley R. Turner and Spence, in which Spence said that he would accept the nomination for the TDNA board of directors if offered by the 2005 nomination committee. The nominating committee has formally nominated Spence to be one of the four recommended candidates for election. cc'd on the letter are Donnis Baggett and Wesley R. Turner.
Date:
October 25, 2004
Creator:
Berkebile, Philip A.
Object Type:
Letter
System:
The UNT Digital Library
The Albany News (Albany, Tex.), Vol. 128, No. 42, Ed. 1 Thursday, March 25, 2004
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
March 25, 2004
Creator:
Lucas, Melinda L.
Object Type:
Newspaper
System:
The Portal to Texas History
Precious Metal Recovery from Fuel Cell MEA's
In 2003, Engelhard Corporation received a DOE award to develop a cost-effective, environmentally friendly approach to recover Pt from fuel cell membrane electrode assemblies (MEA’s). The most important precious metal used in fuel cells is platinum, but ruthenium is also added to the anode electrocatalyst if CO is present in the hydrogen stream. As part of the project, a large number of measurements of Pt and Ru need to be made. A low-cost approach to measuring Pt is using the industry standard spectrophotometric measurement of Pt complexed with stannous chloride. The interference of Ru can be eliminated by reading the Pt absorbance at 450 nm. Spectrophotometric methods for measuring Ru, while reported in the literature, are not as robust. This paper will discuss the options for measuring Pt and Ru using the method of UV-VIS spectrophotometry
Date:
April 25, 2004
Creator:
Shore, Lawrence
Object Type:
Article
System:
The UNT Digital Library
Topical Report: Task 1.3 "Aphron Air Diffusivity"
A method is developed to monitor the rate of loss of air from aphrons at elevated pressures. This technique is used to study the effects of pressure, fluid composition and rates of pressurization and depressurization on the kinetics of air loss from aphrons in APHRON ICS{trademark} drilling fluids.
Date:
November 25, 2004
Creator:
Irving, Maribella & Growcock, Fred
Object Type:
Report
System:
The UNT Digital Library
[News Clip: Blockbuster]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
May 25, 2004
Creator:
NBC 5 (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
Timpson & Tenaha News (Timpson, Tex.), Vol. 19, No. 13, Ed. 1 Thursday, March 25, 2004
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
March 25, 2004
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Timpson & Tenaha News (Timpson, Tex.), Vol. 19, No. 46, Ed. 1 Thursday, November 25, 2004
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
November 25, 2004
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 109, No. 16, Ed. 1 Wednesday, February 25, 2004
Semi-weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
February 25, 2004
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
Polk County Enterprise (Livingston, Tex.), Vol. 122, No. 34, Ed. 1 Sunday, April 25, 2004
Semi-weekly newspaper from Livingston, Texas that includes local, state and national news along with advertising.
Date:
April 25, 2004
Creator:
White, Barbara
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 109, No. 35, Ed. 1 Friday, June 25, 2004
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
June 25, 2004
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
Polk County Enterprise (Livingston, Tex.), Vol. 122, No. 43, Ed. 1 Tuesday, May 25, 2004
Semi-weekly newspaper from Livingston, Texas that includes local, state and national news along with advertising.
Date:
May 25, 2004
Creator:
White, Barbara
Object Type:
Newspaper
System:
The Portal to Texas History
The Odem-Edroy Times (Odem, Tex.), Vol. 58, No. 12, Ed. 1 Thursday, March 25, 2004
Weekly newspaper from Odem, Texas that includes local, state, and national news along with advertising.
Date:
March 25, 2004
Creator:
Perez, Jerry
Object Type:
Newspaper
System:
The Portal to Texas History
The Odem-Edroy Times (Odem, Tex.), Vol. 58, No. 47, Ed. 1 Thursday, November 25, 2004
Weekly newspaper from Odem, Texas that includes local, state, and national news along with advertising.
Date:
November 25, 2004
Creator:
Tracy, Jimmy
Object Type:
Newspaper
System:
The Portal to Texas History
Polk County Enterprise (Livingston, Tex.), Vol. 122, No. 95, Ed. 1 Thursday, November 25, 2004
Semi-weekly newspaper from Livingston, Texas that includes local, state and national news along with advertising.
Date:
November 25, 2004
Creator:
White, Barbara
Object Type:
Newspaper
System:
The Portal to Texas History
Hondo Anvil Herald (Hondo, Tex.), Vol. 118, No. 48, Ed. 1 Thursday, November 25, 2004
Weekly newspaper from Hondo, Texas that includes local, state, and national news along with extensive advertising.
Date:
November 25, 2004
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Hondo Anvil Herald (Hondo, Tex.), Vol. 118, No. 13, Ed. 1 Thursday, March 25, 2004
Weekly newspaper from Hondo, Texas that includes local, state, and national news along with extensive advertising.
Date:
March 25, 2004
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Polk County Enterprise (Livingston, Tex.), Vol. 122, No. 60, Ed. 1 Sunday, July 25, 2004
Semi-weekly newspaper from Livingston, Texas that includes local, state and national news along with advertising.
Date:
July 25, 2004
Creator:
White, Barbara
Object Type:
Newspaper
System:
The Portal to Texas History
Polk County Enterprise (Livingston, Tex.), Vol. 122, No. 8, Ed. 1 Sunday, January 25, 2004
Semi-weekly newspaper from Livingston, Texas that includes local, state and national news along with advertising.
Date:
January 25, 2004
Creator:
White, Barbara
Object Type:
Newspaper
System:
The Portal to Texas History