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444 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
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
Scoping Meeting Summary, Wailuku, Maui, March 9, 1992, 2 PM Session
The meeting began with presentations by the facilitator, Mr. Spiegel, and Dr. Lewis, the program director from DOE. The facilitator introduced those on the podium. He then described the general structure of the meeting and its purpose: to hear the issues and concerns of those present regarding the proposed Hawaiian Geothermal Project. He described his role in ensuring the impartiality and fairness of the meeting. Dr. Lewis further defined the scope of the project, introduced members of the EIS team, briefly described the EIS process, and answered several process questions, noting that cable feasibility would be examined and that Native Hawaiian concerns would be addressed. Ms. Borgstrom stated that the ISIS Implementation Plan will be continuously refined and that impacts of reasonably foreseeable future activities would be examined. During the meeting, more than 90% of the commenters requested that the EIS identify and assess the relative merits and impacts of energy alternatives to the proposed action. Nearly 80% requested that the EIS investigate conservation and renewable forms of energy, such as wind, solar, and biomass. They suggested that integrated resource planning should be used, noting that the State is initiating such a process. More than 30% of the commenters asked …
Date:
June 6, 1992
Creator:
Quinby-Hunt, Mary S.
Object Type:
Report
System:
The UNT Digital Library
[Press release: NGLTF Board approves 1993 budget]
Press release announcing the approved budget for 1993 and the task force's staff expansion.
Date:
October 6, 1992
Creator:
National Gay and Lesbian Task Force (U.S.)
Object Type:
Text
System:
The UNT Digital Library
[Press Release: NGLTF 5th annual Creating Change Conference slated for L.A.]
A press release about the National Gay and Lesbian Task Force announcing the 5th annual Creating Change Conferences in Los Angeles, California.
Date:
February 6, 1992
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
[Press release: Civil rights roundup: victories in Kentucky, California, and Utah]
Press release announcing gay and lesbian civil rights victories in Kentucky, California, and Utah.
Date:
October 6, 1992
Creator:
National Gay and Lesbian Task Force (U.S.)
Object Type:
Text
System:
The UNT Digital Library
The Tulia Herald (Tulia, Tex.), Vol. 84, No. 32, Ed. 1 Thursday, August 6, 1992
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
August 6, 1992
Creator:
Reynolds, Jim
Object Type:
Newspaper
System:
The Portal to Texas History
The Tulia Herald (Tulia, Tex.), Vol. 84, No. 6, Ed. 1 Thursday, February 6, 1992
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
February 6, 1992
Creator:
Reynolds, Jim
Object Type:
Newspaper
System:
The Portal to Texas History
LIFAC sorbent injection desulfurization demonstration project
In December 1990, the US Department of Energy selected 13 projects for funding under the Federal Clean Coal Technology Program (Round III). One of the projects selected was the project sponsored by LIFAC North America, (LIFAC NA), titled LIFAC Sorbent Injection Desulfurization Demonstration Project.'' The host site for this $17 million, three-phase project is Richmond Power and Light's Whitewater Valley Unit No. 2 in Richmond, Indiana. The LIFAC technology uses upper-furnace limestone injection with patented humidification of the flue gas to remove 75--85% of the sulfur dioxide (SO{sub 2}) in the flue gas. In this report, progress for the period July--September 1991 is covered.
Date:
March 6, 1992
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Capturing asteroids into bound orbits around the earth: Massive early return on an asteroid terminal defense system
Nuclear explosives may be used to capture small asteroids (e.g., 20--50 meters in diameter) into bound orbits around the earth. The captured objects could be used for construction material for manned and unmanned activity in Earth orbit. Asteroids with small approach velocities, which are the ones most likely to have close approaches to the Earth, require the least energy for capture. They are particularly easy to capture if they pass within one Earth radius of the surface of the Earth. They could be intercepted with intercontinental missiles if the latter were retrofit with a more flexible guiding and homing capability. This asteroid capture-defense system could be implemented in a few years at low cost by using decommissioned ICMs. The economic value of even one captured asteroid is many times the initial investment. The asteroid capture system would be an essential part of the learning curve for dealing with larger asteroids that can hit the earth.
Date:
February 6, 1992
Creator:
Hills, J.G.
Object Type:
Article
System:
The UNT Digital Library
[Clipping: Women contributed to WWII campaign]
Newspaper clipping of an article about WASP, who served in WWII as pilots, and their experiences in service. The article includes two photographs of two WASP, Madge Moore and Betty Shipley. On the back of the clipping are three different advice columns, about parenting, working life, and interpersonal relationships.
Date:
September 6, 1992
Creator:
unknown
Object Type:
Clipping
System:
The Portal to Texas History
[Clipping photocopies: Female fliers' wartime work finally winning recognition]
Photocopies of newspaper clippings of an article about female pilots from WWII being recognized for their service. The article includes photographs of the pilots, including Betty Williamson Shipley, Madge Leon Moore, Dorothy Smith Lucas, and Holly Hollinger Grasso.
Date:
September 6, 1992
Creator:
Pisano, Marina
Object Type:
Clipping
System:
The Portal to Texas History
Monitoring conservative retrofits in single family buildings
This study has provided detailed before-and-after information on the ambient and comfort conditions in nine single family buildings, and on the energy consumption of those buildings, for one or more energy conservation retrofits. The data were recorded in such a manner that as well as being able to determine the savings from the retrofits and the influence these retrofits have on the comfort conditions of the residence, the effects of the retrofits on time-of-day usage are also determinable. The following are included in appendices: a table of participant's names, site addresses and retrofit; significant dates and appropriate comments; a day of data and an annotated data set; pre-retrofit and post-retrofit audit data sheets; and usage history.
Date:
December 6, 1992
Creator:
Richardson, C.S.
Object Type:
Report
System:
The UNT Digital Library
The prospects for polarized target materials with pure carbon background
None of the materials presently in common use for polarized proton targets has a pure carbon nuclear background. The alcohols and diols contain some oxygen, and the ammonia and amine-based materials contain nitrogen and/or other noncarbon species. In the latter cases the noncarbon nuclei are measurably polarized as a concomitant of the process used to polarize the hydrogen nuclei. The relative simplicity of a pure carbon background would be advantageous for most types of scattering experiments and perhaps crucial for some. In addition to simplifying the kinematics of background events, pure carbon is relatively easy to prepare as a dummy'' target for background subtraction. Also, in such a target material, [sup 13]C-enrichment would yield a clean polarized [sup 13]C material. In this note I explore the possibilities for such materials, touching upon only what I consider to be the high'' points. The subject matter is capable of nearly endless ramification and speculation. In fact, owing to a general lack of relevant experimental data, even this relatively brief note contains much that is speculative to some degree.
Date:
October 6, 1992
Creator:
Hill, D.A.
Object Type:
Report
System:
The UNT Digital Library
Magnetic relaxation: Coal swelling, extraction, pore size
The goals for year I of the grant were to extract the Argonne Coals, to swell them, to reswell their residues, to seal the various samples for measurements, to perform analyses of the samples and to measure their NMR decays. Because of an unexpected characteristic of the extraction process, more detailed analyses of the samples are being done than originally anticipated. The mass spectrometric analyses have not been completed. Because routine NMR analyses needed to be done in greater detail than anticipated, the NMR decay measurements have also been delayed. In order to offset these delays, all of the EPR samples, which were to have been examined in year III, have been prepared and a substantial proportion of the pulsed EPR measurements have been made.
Date:
November 6, 1992
Creator:
Doetschman, D.C.
Object Type:
Report
System:
The UNT Digital Library