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53
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20
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17
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12
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Solid State NMR Measurements for Preliminary Lifetime Assessments in gamma-Irradiated and Thermally Aged Siloxane Elastomers
Siloxanes have a wide variety of applications throughout the aerospace industry which take advantage of their exceptional insulating and adhesive properties and general resilience. They also offer a wide range of tailorable engineering properties with changes in composition and filler content. They are, however, subject to degradation in radiatively and thermally harsh environments. We are using solid state nuclear magnetic resonance techniques to investigate changes in network and interfacial structure in siloxane elastomers and their correlations to changes in engineering performance in a series of degraded materials. NMR parameters such as transverse ( T{sub 2}) relaxation times, cross relaxation rates, and residual dipolar coupling constants provide excellent probes of changes crosslink density and motional dynamics of the polymers caused by multi-mechanism degradation. The results of NMR studies on aged siloxanes are being used in conjunction with other mechanical tests to provide insight into component failure and degradation kinetics necessary for preliminary lifetime assessments of these materials as well as into the structure-property relationships of the polymers. NMR and MRI results obtained both from high resolution NMR spectrometers as well as low resolution benchtop NMR screening tools will be presented.
Date:
November 29, 2004
Creator:
Chinn, S C; Herberg, J L; Sawvel, A M & Maxwell, R S
Object Type:
Report
System:
The UNT Digital Library
Libya
This report includes information regarding U.S. relations with Libya as well as other Libyan foreign relations and government.
Date:
November 29, 2004
Creator:
Mark, Clyde R.
Object Type:
Report
System:
The UNT Digital Library
The Budget for Fiscal Year 2005
This report details the information related to budget allocation for FY 2005 The contents include Budget Action, Outlays, Receipts, deficits, and Surpluses, etc.
Date:
March 29, 2004
Creator:
Winters, Philip D.
Object Type:
Report
System:
The UNT Digital Library
[List of TDNA board members and terms served]
A complete list of Texas Daily Newspaper Associations members and their terms, if available, that they have served as board officers or directors. The list begins in 1985 and go until 2005.
Date:
November 29, 2004
Creator:
Texas Daily Newspaper Association
Object Type:
Text
System:
The UNT Digital Library
Victoria Independent School District, October 2004
"The report reviews the management and performance of the Victoria Independent School District's (VISD's) education, financial, and operational functions."
Date:
October 29, 2004
Creator:
Texas. Legislative Budget Board.
Object Type:
Report
System:
The Portal to Texas History
The Albany News (Albany, Tex.), Vol. 129, No. 9, Ed. 1 Thursday, July 29, 2004
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
July 29, 2004
Creator:
Lucas, Melinda L.
Object Type:
Newspaper
System:
The Portal to Texas History
The Albany News (Albany, Tex.), Vol. 128, No. 47, Ed. 1 Thursday, April 29, 2004
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
April 29, 2004
Creator:
Lucas, Melinda L.
Object Type:
Newspaper
System:
The Portal to Texas History
Initial results of a positron tomograph for prostate imaging
We present the status and initial images of a positrontomograph for prostate imaging that centers a patient between a pair ofexternal curved detector banks (ellipse: 45 cm minor, 70 cm major axis).The distance between detector banks adjusts to allow patient access andto position the detectors as closely as possible for maximum sensitivitywith patients of various sizes. Each bank is composed of two axial rowsof 20 CTI PET Systems HR+ block detectors for a total of 80 modules inthe camera. Compared to an ECAT HR PET system operating in 3D mode, ourcamera uses about one-quarter the number of detectors and hasapproximately the same sensitivity for a central point source, becauseour detectors are close to the patient. The individual detectors areangled in the plane to point towards the prostate to minimize resolutiondegradation in that region. The detectors are read out by modified CTIdata acquisition electronics. We have completed construction of thegantry and electronics, have developed detector calibration and dataacquisition software, and are taking coincidence data. We demonstratethat we can clearly visualize a "prostate" in a simple phantom.Reconstructed images of two phantoms are shown.
Date:
November 29, 2004
Creator:
Huber, J. S.; Choong, W. S.; Moses, W. W.; Qi, J.; Hu, J.; Wang, G. C. et al.
Object Type:
Article
System:
The UNT Digital Library
Determining flow, recharge, and vadose zonedrainage in anunconfined aquifer from groundwater strontium isotope measurements, PascoBasin, WA
Strontium isotope compositions (87Sr/86Sr) measured in groundwater samples from 273 wells in the Pasco Basin unconfined aquifer below the Hanford Site show large and systematic variations that provide constraints on groundwater recharge, weathering rates of the aquifer host rocks, communication between unconfined and deeper confined aquifers, and vadose zone-groundwater interaction. The impact of millions of cubic meters of wastewater discharged to the vadose zone (103-105 times higher than ambient drainage) shows up strikingly on maps of groundwater 87Sr/86Sr. Extensive access through the many groundwater monitoring wells at the site allows for an unprecedented opportunity to evaluate the strontium geochemistry of a major aquifer, hosted primarily in unconsolidated sediments, and relate it to both long term properties and recent disturbances. Groundwater 87Sr/86Sr increases systematically from 0.707 to 0.712 from west to east across the Hanford Site, in the general direction of groundwater flow, as a result of addition of Sr from the weathering of aquifer sediments and from diffuse drainage through the vadose zone. The lower 87Sr/86Sr groundwater reflects recharge waters that have acquired Sr from Columbia River Basalts. Based on a steady-state model of Sr reactive transport and drainage, there is an average natural drainage flux of 0-1.4 mm/yr near …
Date:
June 29, 2004
Creator:
Singleton, Michael J.; Maher, Katharine; DePaulo, Donald J.; Conrad, Mark E. & Dresel, P. Evan
Object Type:
Article
System:
The UNT Digital Library
KINETICS OF SLURRY PHASE FISCHER-TROPSCH SYNTHESIS
This report covers the second year of this three-year research grant under the University Coal Research program. The overall objective of this project is to develop a comprehensive kinetic model for slurry phase Fischer-Tropsch synthesis on iron catalysts. This model will be validated with experimental data obtained in a stirred tank slurry reactor (STSR) over a wide range of process conditions. The model will be able to predict concentrations of all reactants and major product species (H{sub 2}O, CO{sub 2}, linear 1- and 2-olefins, and linear paraffins) as a function of reaction conditions in the STSR. During the second year of the project we completed the STSR test SB-26203 (275-343 h on stream), which was initiated during the first year of the project, and another STSR test (SB-28603 lasting 341 h). Since the inception of the project we completed 3 STSR tests, and evaluated catalyst under 25 different sets of process conditions. A precipitated iron catalyst obtained from Ruhrchemie AG (Oberhausen-Holten, Germany) was used in all tests. This catalyst was used initially in commercial fixed bed reactors at Sasol in South Africa. Also, during the second year we performed a qualitative analysis of experimental data from all three STSR tests. …
Date:
September 29, 2004
Creator:
Bukur, Dragomir B.
Object Type:
Report
System:
The UNT Digital Library
Development of Novel Water-Gas Shift Membrane Reactor
This report summarizes the objectives, technical barrier, approach, and accomplishments for the development of a novel water-gas-shift (WGS) membrane reactor for hydrogen enhancement and CO reduction. We have synthesized novel CO{sub 2}-selective membranes with high CO{sub 2} permeabilities and high CO{sub 2}/H{sub 2} and CO{sub 2}/CO selectivities by incorporating amino groups in polymer networks. We have also developed a one-dimensional non-isothermal model for the countercurrent WGS membrane reactor. The modeling results have shown that H{sub 2} enhancement (>99.6% H{sub 2} for the steam reforming of methane and >54% H{sub 2} for the autothermal reforming of gasoline with air on a dry basis) via CO{sub 2} removal and CO reduction to 10 ppm or lower are achievable for synthesis gases. With this model, we have elucidated the effects of system parameters, including CO{sub 2}/H{sub 2} selectivity, CO{sub 2} permeability, sweep/feed flow rate ratio, feed temperature, sweep temperature, feed pressure, catalyst activity, and feed CO concentration, on the membrane reactor performance. Based on the modeling study using the membrane data obtained, we showed the feasibility of achieving H{sub 2} enhancement via CO{sub 2} removal, CO reduction to {le} 10 ppm, and high H{sub 2} recovery. Using the membrane synthesized, we have obtained …
Date:
December 29, 2004
Creator:
Ho, W. S. Winston
Object Type:
Report
System:
The UNT Digital Library
Advanced Membrane Filtration Technology for Cost Effective Recovery of Fresh Water from Oil & Gas Produced Brine
Produced water is a major waste generated at the oil and natural gas wells in the state of Texas. This water could be a possible source of new fresh water to meet the growing demands of the state after treatment and purification. Treatment of brine generated in oil fields or produced water with an ultrafiltration membranes were the subject of this thesis. The characterization of ultrafiltration membranes for oil and suspended solids removal of produced water, coupled with the reverse osmosis (RO) desalination of brine were studied on lab size membrane testing equipment and a field size testing unit to test whether a viable membrane system could be used to treat produced water. Oil and suspended solids were evaluated using turbidity and oil in water measurements taken periodically. The research considered the effect of pressure and flow rate on membrane performance of produced water treatment of three commercially available membranes for oily water. The study also analyzed the flux through the membrane and any effect it had on membrane performance. The research showed that an ultrafiltration membrane provided turbidity removal of over 99% and oil removal of 78% for the produced water samples. The results indicated that the ultrafiltration membranes …
Date:
September 29, 2004
Creator:
Burnett, David B.
Object Type:
Report
System:
The UNT Digital Library
Heat Pump Water Heater Durabliltiy Testing - Phase II
Ten heat pump water heaters (HPWH) were placed in an environmentally controlled test facility and run through a durability test program of approximately 7300 duty cycles (actual cycles accumulated ranged from 6640 to 8324 for the ten units). Five of the units were upgraded integral types (HPWH mounted on storage tank, no pump) from the same manufacturer as those tested in our first durability program in 2001 (Baxter and Linkous, 2002). The other five were ''add-on'' type units (HPWH with circulation pump plumbed to a separate storage tank) from another manufacturer. This durability test was designed to represent approximately 7-10 years of normal operation to meet the hot water needs of a residence. The integral units operated without incident apart from two control board failures. Both of these were caused by inadvertent exposure to very hot and humid (>135 F dry bulb and >120 F dew point) conditions that occurred due to a test loop failure. It is not likely that any residential water heater would be installed where such conditions were expected so these failures are not considered a long-term reliability concern. Two of the integral HPWHs featured a condensate management system (CMS) option that effectively eliminated any need …
Date:
May 29, 2004
Creator:
Baxter, VAND.
Object Type:
Report
System:
The UNT Digital Library
[News Clip: Carly Patterson]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
August 29, 2004
Creator:
NBC 5 (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Jeremy Wariner]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
August 29, 2004
Creator:
NBC 5 (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Six Flags Flood]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
June 29, 2004
Creator:
NBC 5 (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[Letter from Sherry Tanklsey to Larcine Bland, November 29, 2004]
Letter from Sherry Tanksley to Larcine Bland inviting Bland to the annual volunteer appreciation celebration hosted by the Black Academy of Arts and Letters on December 4, 2004.
Date:
November 29, 2004
Creator:
Tanksley, Sherry
Object Type:
Letter
System:
The UNT Digital Library
Cooper Review (Cooper, Tex.), Vol. 124, No. 5, Ed. 1 Thursday, January 29, 2004
Weekly newspaper from Cooper, Texas that includes local, state, and national news along with advertising.
Date:
January 29, 2004
Creator:
Pinson, Beth
Object Type:
Newspaper
System:
The Portal to Texas History
The Ranger (San Antonio, Tex.), Vol. 79, No. 8, Ed. 1 Friday, October 29, 2004
Weekly student newspaper from San Antonio College in San Antonio, Texas that includes campus news along with advertising.
Date:
October 29, 2004
Creator:
San Antonio College
Object Type:
Newspaper
System:
The Portal to Texas History
The Longhorn Express (Harper, Tex.), Vol. 7, No. 1, Ed. 1 Wednesday, September 29, 2004
Student newspaper of Harper Independent School District in Harper, Texas that includes school news and information along with advertising.
Date:
September 29, 2004
Creator:
Harper Independent School District Journalism Class
Object Type:
Newspaper
System:
The Portal to Texas History
Texas Jewish Post (Fort Worth, Tex.), Vol. 58, No. 5, Ed. 1 Thursday, January 29, 2004
Weekly Jewish newspaper from Fort Worth, Texas that includes local, state, and national news along with extensive advertising.
Date:
January 29, 2004
Creator:
Wisch, Rene & Wisch-Ray, Sharon
Object Type:
Newspaper
System:
The Portal to Texas History
The Odem-Edroy Times (Odem, Tex.), Vol. 58, No. 4, Ed. 1 Thursday, January 29, 2004
Weekly newspaper from Odem, Texas that includes local, state, and national news along with advertising.
Date:
January 29, 2004
Creator:
Vargas, Richard, Jr.
Object Type:
Newspaper
System:
The Portal to Texas History
The Odem-Edroy Times (Odem, Tex.), Vol. 58, No. 17, Ed. 1 Thursday, April 29, 2004
Weekly newspaper from Odem, Texas that includes local, state, and national news along with advertising.
Date:
April 29, 2004
Creator:
Perez, Jerry
Object Type:
Newspaper
System:
The Portal to Texas History
The Odem-Edroy Times (Odem, Tex.), Vol. 58, No. 30, Ed. 1 Thursday, July 29, 2004
Weekly newspaper from Odem, Texas that includes local, state, and national news along with advertising.
Date:
July 29, 2004
Creator:
Tracy, Jimmy
Object Type:
Newspaper
System:
The Portal to Texas History