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815 Matching Results
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The development of precipitated iron catalysts with improved stability
The objective of this program is to identify the chemical principles governing the deactivation of precipitated iron catalysts during Fischer-Tropsch synthesis and to use these chemical principles in the design of catalysts suitable for slurry reactors. The performance targets are 88% CO+H{sub 2} conversion with less than 1% deactivation/day for 1 month and a methane and ethane selectivity of no more than 7% (based on hydrocarbons and oxygenates only) at a space velocity of at least 2 normal liters per hr per gram iron (NL/hr/gFe) using a synthesis gas with 0.5-1.0 H{sub 2}:CO ratio in a slurry reactor.
Date:
May 6, 1992
Creator:
Abrevaya, H.
Object Type:
Report
System:
The UNT Digital Library
Optimization of a VISAR for measuring flyer-plate velocities
VISAR (Velocity Interferometer System for Any Reflector) is commonly used for measuring flyer-plate velocities up to 6 km/s. Flyer plates can travel as much as 1 mm, which is large compared to usual depth-of-focus requirements for VISARs. Flyer plates are explosively driven, or driven by some other very energetic means; as such, they must be tested in a chamber, which will contain the explosion. Routing the laser beam to the chamber and the signal beam to the VISAR can be done safely and easily in multi-mode optical fibers. We have optimized a fiber-coupled VISAR system for measuring flyer-plate velocities. This system given constant signal levels over the full travel of the flyer plate. Furthermore, the signal-collection efficiency is maximized, which allows use of a moderately sized laser. We also have optimized the VISAR cavity so it does not limit the system efficiency while giving a velocity sensitivity of about 1 km/s per fringe. 5 refs.
Date:
May 6, 1992
Creator:
Sweatt, W. C.; Crump, O. B., Jr. & Brigham, W. P.
Object Type:
Article
System:
The UNT Digital Library
The development of precipitated iron catalysts with improved stability
The objective of this program is to identify the chemical principles governing the deactivation of precipitated iron catalysts during Fischer-Tropsch synthesis and to use these chemical principles in the design of catalysts suitable for slurry reactors. The performance targets are 88% CO+H{sub 2} conversion with less than 1% deactivation/day for 1 month and a methane and ethane selectivity of no more than 7% (based on hydrocarbons and oxygenates only) at a space velocity of at least 2 normal liters per hr gram iron (NL/hr/gFe) using a synthesis gas with 0.5--1.0 H{sub 2}:Co ratio in a slurry reactor.
Date:
May 6, 1992
Creator:
Abrevaya, H.
Object Type:
Report
System:
The UNT Digital Library
The development of precipitated iron catalysts with improved stability
The objective of this program is to identify the chemical principles governing the deactivation of precipitated iron catalysts during Fischer-Tropsch synthesis and to use these chemical principles in the design of catalysts suitable for slurry reactors. The performance targets are 88% CO+H{sub 2} conversion with less than 1% deactivation/day for 1 month and a methane and ethane selectivity of no more than 7% (based on hydrocarbons and oxygenates only) at a space velocity of at least 2 normal liters per hr per gram iron (NL/hr/gFe) using a synthesis gas with 0.5-1.0 H{sub 2}:CO ratio in a slurry reactor.
Date:
May 6, 1992
Creator:
Abrevaya, H.
Object Type:
Report
System:
The UNT Digital Library
The effect of chemical additives on the synthesis of ethanol
The objective of this research was to investigate the reaction mechanism of higher alcohol and aldehyde synthesis from syngas and the role of additives in the synthesis. An in situ IR reaction system and probe molecule technique were developed to study adsorbed species, active sites, and reaction pathway during reaction. The catalysts used for this study included silica-supported Rh, Ru, and Ni. (VC)
Date:
March 6, 1992
Creator:
Chuang, S.S.C.
Object Type:
Report
System:
The UNT Digital Library
The development of precipitated iron catalysts with improved stability
The objective of this program is to identify the chemical principles governing the deactivation of precipitated iron catalysts during Fischer-Tropsch synthesis and to use these chemical principles in the design of catalysts suitable for slurry reactors. The performance targets are 88% CO+H{sub 2} conversion with less than 1% deactivation/day for 1 month and a methane and ethane selectivity of no more than 7% (based on hydrocarbons and oxygenates only) at a space velocity of at least 2 normal liters per hr per gram iron (NL/hr/gFe) using a synthesis gas with 0.5-1.0 H{sub 2}:CO ratio in a slurry reactor.
Date:
May 6, 1992
Creator:
Abrevaya, H.
Object Type:
Report
System:
The UNT Digital Library
A universal, fault-tolerant, non-linear analytic network for modeling and fault detection
The similarities and differences of a universal network to normal neural networks are outlined. The description and application of a universal network is discussed by showing how a simple linear system is modeled by normal techniques and by universal network techniques. A full implementation of the universal network as universal process modeling software on a dedicated computer system at EBR-II is described and example results are presented. It is concluded that the universal network provides different feature recognition capabilities than a neural network and that the universal network can provide extremely fast, accurate, and fault-tolerant estimation, validation, and replacement of signals in a real system.
Date:
March 6, 1992
Creator:
Mott, J. E. (Advanced Modeling Techniques Corp., Idaho Falls, ID (United States)); King, R. W.; Monson, L. R.; Olson, D. L. & Staffon, J. D. (Argonne National Lab., Idaho Falls, ID (United States))
Object Type:
Article
System:
The UNT Digital Library
The development of precipitated iron catalysts with improved stability
The objective of this program is to identify the chemical principles governing the deactivation of precipitated iron catalysts during Fischer-Tropsch synthesis and to use these chemical principles in the design of catalysts suitable for slurry reactors. The performance targets are 88% CO+H{sub 2} conversion with less than 1% deactivation/day for 1 month and a methane and ethane selectivity of no more than 7% (based on hydrocarbons and oxygenates only) at a space velocity of at least 2 normal liters per hr per gram iron (NL/hr/gFe) using a synthesis gas with 0.5-1.0 H{sub 2}:CP ratio in a slurry reactor.
Date:
May 6, 1992
Creator:
Abrevaya, H.
Object Type:
Report
System:
The UNT Digital Library
The development of precipitated iron catalysts with improved stability
The objective of this program is to identify the chemical principles governing the deactivation of precipitated iron catalysts during Fischer-Tropsch synthesis and to use these chemical principles in the design of catalysts suitable for slurry reactors. The performance targets are 88% CO+H{sub 2} conversion with less than 1% deactivation/day for 1 month and a methane and ethane selectivity of no more than 7% (based on hydrocarbons and oxygenates only) at a space velocity of at least 2 normal liters per hr per gram iron (NL/hr/gFe) using a synthesis gas with 0.5-1.0 H{sub 2}:CO ratio in a slurry reactor.
Date:
May 6, 1992
Creator:
Abrevaya, H.
Object Type:
Report
System:
The UNT Digital Library
Effects of high beam rates on TPC's
The TPC's (Time Projection Chamber) used in E-810 at the AGS (Alternating Gradient Synchroton) were exposed to silicon ion fluxes equivalent to more than 10{sup 7} minimum ionizing particles per second to measure the distortion of the electric field caused by positive ions in the drift region. Results of these tests are presented and the consequences for the TPC based experiment at RHIC (Relativistic Heavy Ion Collider) are discussed.
Date:
February 6, 1992
Creator:
Etkin, A.; Eiseman, S. E.; Foley, K. J.; Hackenburg, R. W.; Longacre, R. S.; Love, W. A. et al.
Object Type:
Article
System:
The UNT Digital Library
[Photograph 2012.201.B0114.0594]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Maj. Bob Buckner, left, suffered second-degree burns in a natural gas explosion in 1983."
Date:
January 6, 1992
Creator:
Southerland, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0140.0117]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Patrick Collins / Plains Resources Inc. / President."
Date:
January 6, 1992
Creator:
Klock, Roger
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0144.0487]
Photograph used for a story in the Daily Oklahoman newspaper.
Date:
October 6, 1992
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0175.0004]
Photograph used for a story in the Daily Oklahoman newspaper.
Date:
September 6, 1992
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0166.0444]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "As her supervisor relays information to a dispatcher an Oklahoma City police questions two witnesses after Thursday's shooting of a Douglass High School student."
Date:
February 6, 1992
Creator:
McDaniel, David
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0149.0677]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Tinker historian James Crowder examines some of the information he uses to document the base's 50-year history."
Date:
May 6, 1992
Creator:
Beckel, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0135.0595]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Carol Clark, 39, never married."
Date:
February 6, 1992
Creator:
Hoke, Doug
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0144.0174]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
June 6, 1992
Creator:
Sisney, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0134.0411]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "University of Oklahoma football players Gale Gundy and Drew Christmon are expected to play key roles for OU's baseball team this spring.."
Date:
February 6, 1992
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0139.0253]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Oklahoma Zoological Society president Jim Cole and his wife, Dean, are left holding the empty ostrich egg shells."
Date:
June 6, 1992
Creator:
Hoke, Doug
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0146.0701]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Cowns James / Luther police chief"
Date:
April 6, 1992
Creator:
Sisney, Steve
Object Type:
Photograph
System:
The Gateway to Oklahoma History
An analysis of sensitivity tests
A new method of analyzing sensitivity tests is proposed. It uses the Likelihood Ratio Test to compute regions of arbitrary confidence. It can calculate confidence regions for the parameters of the distribution (e.g., the mean, {mu}, and the standard deviation, {sigma}) as well as various percentiles. Unlike presently used methods, such as those based on asymptotic analysis, it can analyze the results of all sensitivity tests, and it does not significantly underestimate the size of the confidence regions. The main disadvantage of this method is that it requires much more computation to calculate the confidence regions. However, these calculations can be easily and quickly performed on most computers.
Date:
March 6, 1992
Creator:
Neyer, Barry T.
Object Type:
Report
System:
The UNT Digital Library
[Photograph 2012.201.B0348.0525]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Macmillan/McGraw-Hill Scholarship Winner Gibran Lacey, OKC, at U. S. Space Camp"
Date:
November 6, 1992
Creator:
unknown
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0232.0450]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "A pharmacy museum will open this fall in the Gaffney Building at 214 Oklahoma i n Guthrie."
Date:
February 6, 1992
Creator:
Southerland, Paul
Object Type:
Photograph
System:
The Gateway to Oklahoma History