Collection
Office of Scientific & Technical Information Technical Reports
250
Congressional Research Service Reports
106
Texas Attorney General Opinions
55
Texas Patents
45
Texas Laws and Resolutions Archive
44
Technical Report Archive and Image Library
39
Government Accountability Office Reports
31
National Advisory Committee for Aeronautics Collection
25
TRAIL Microcard Collection
13
Texas Register
11
7 More
States
597 Matching Results
Results open in a new window/tab.
Results:
1 - 24 of
597
next
Measurement of $D^{* /-}$ Meson Production in Jets from Pp Collisions at Sqrt(S) = 7 TeV with the ATLAS Detector
None
Date:
May 6, 2013
Creator:
Aad, Georges
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}: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 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 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 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
The development of precipitated iron catalysts with improved stability. Technical progress report No. 5, September 16, 1988--December 16, 1988
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 development of precipitated iron catalysts with improved stability. Technical progress report No. 6, December 16, 1988--March 16, 1989
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 development of precipitated iron catalysts with improved stability. Technical progress report No. 7, March 16, 1989--June 16, 1989
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. Technical progress report No. 8, June 16, 1989--September 16, 1989
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 development of precipitated iron catalysts with improved stability. Technical progress report No. 9, September 16, 1989--December 16, 1989
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 development of precipitated iron catalysts with improved stability. Technical progress report No. 10, December 16, 1989--April 31, 1990
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
Mercosur: Formation, Status, Trade Effects, Policy Challenges, and U.S. Interests
This report examines Mercosur, the third largest preferential trading group in the world. Since its inception in 1991, Mercosur has made considerable progress in integrating the economies of its members. The integration --- an almost complete free trade area and a partial customs union --- has been accompanied by a significant increase in U.S. exports and investment to the region. In the future, Mercosur face challenges affecting the size of its membership, the depth of its integration, and the strength of its institutions.
Date:
May 6, 1998
Creator:
Ahearn, Raymond J.
Object Type:
Report
System:
The UNT Digital Library
SIMPLE TRANSIENT CALCULATIONS OF CELL FLAMMABLE GAS CONCENTRATIONS
The Saltstone Facility at Savannah River Site (SRS) mixes low-level radiological liquid waste with grout for permanent disposal as cement in vault cells. The grout mixture is poured into each cell in approximately 17 batches (8 to 10 hours duration). The grout mixture contains ten flammable gases of concern that are released from the mixture into the cell. Prior to operations, simple parametric transient calculations were performed to develop batch parameters (including schedule of batch pours) to support operational efficiency while ensuring that a flammable gas mixture does not develop in the cell vapor space. The analysis demonstrated that a nonflammable vapor space environment can be achieved, with workable operational constraints, without crediting the ventilation flow as a safety system control. Isopar L was identified as the primary flammable gas of concern. The transient calculations balanced inflows of the flammable gases into the vapor space with credited outflows of diurnal breathing through vent holes and displacement from new grout pours and gases generated. Other important features of the analyses included identifying conditions that inhibited a well-mixed vapor space, the expected frequency and duration of such conditions, and the estimated level of stratification that could develop.
Date:
May 6, 2009
Creator:
Allison, David K.; McAllister, John E.; Thoman, David C.; McCord, J. Brent & Campbell, Corey
Object Type:
Article
System:
The UNT Digital Library
Research recommendations to the EPA in support of earth system modeling activities
A theme which emerges from our simple considerations is that some well-planned early parametric and sensitivity studies, using current-generation coupled Earth system model components, along with simplistic proxy models of terrestrial biospheric and biogeochemical processes, could furnish valuable information to help guide the development of a longer-term plan for research supporting ESM development. This theme is rooted in the premise that the importance of various ESM component processes can be fully assessed only from the perspective of a complete coupling of that process into the ESM context. That is, the question, ``How well must a given process be modelled``? Cannot be answered in isolation, but rather requires a careful blend of process research and coupled model studies.
Date:
May 6, 1994
Creator:
Ambrosiano, J. J.; Dannevik, W. P.; Kercher, J.; Miller, N. L.; Penner, J. E. & Rotman, D.
Object Type:
Report
System:
The UNT Digital Library
Guide to Individuals Seated on the Senate Dais
This report is one of a series on the legislative process. It contains a guide to individuals seated on the Senate Dais.
Date:
May 6, 2008
Creator:
Amer, Mildred
Object Type:
Report
System:
The UNT Digital Library
Preliminary petrographic study of rock from Nevada Test Site - Basalt Mesa
Discussing photographs of rocks from Basalt Mesa
Date:
May 6, 1960
Creator:
Anderson, E. E.
Object Type:
Report
System:
The UNT Digital Library
Glass formulation requirements for Hanford coupled operations using crystalline silicotitanates (CST)
The U.S. Department of Energy (DOE) through the Richland Operations Office has requested proposals from the private sector for the treatment of waste from the Hanford Waste Tanks. Phase I of this privatization initiative may include a demonstration for treatment and immobilization of both low activity and high-level waste. If the demonstration includes high-level waste, then the Cs-137 waste stream most likely will be combined with the high-level waste sludge to produce a coupled feed for immobilization (most likely vitrification using a borosilicate glass). It appears that pretreatment will involve the removal of cesium (and perhaps strontium and some transuranic radionuclides) from the supernate using an ion exchange material such as crystalline silicotitanate (CST). The ion exchange sorbent (or the eluted Cs-137) can then be combined with the sludge and vitrified in a coupled operation similar to the DWPF process. Alternatively, the cesium-loaded ion exchange sorbent can be vitrified directly to produce a separate glass waste form. SRTC has been involved in an Office of Science and Technology (EM-50) funded project to determine if Cs-137 loaded CST can be successfully incorporated into glass at significant levels. 1 For a waste form which would include only Cs-137 loaded CST, concentrations up …
Date:
May 6, 1997
Creator:
Andrews, M.K. & Harbour, J.R.
Object Type:
Report
System:
The UNT Digital Library
Cosmos++: Relativistic Magnetohydrodynamics on Unstructured Grids with Local Adaptive Refinement
A new code and methodology are introduced for solving the fully general relativistic magnetohydrodynamic (GRMHD) equations using time-explicit, finite-volume discretization. The code has options for solving the GRMHD equations using traditional artificial-viscosity (AV) or non-oscillatory central difference (NOCD) methods, or a new extended AV (eAV) scheme using artificial-viscosity together with a dual energy-flux-conserving formulation. The dual energy approach allows for accurate modeling of highly relativistic flows at boost factors well beyond what has been achieved to date by standard artificial viscosity methods. it provides the benefit of Godunov methods in capturing high Lorentz boosted flows but without complicated Riemann solvers, and the advantages of traditional artificial viscosity methods in their speed and flexibility. Additionally, the GRMHD equations are solved on an unstructured grid that supports local adaptive mesh refinement using a fully threated oct-tree (in three dimensions) network to traverse the grid hierarchy across levels and immediate neighbors. A number of tests are presented to demonstrate robustness of the numerical algorithms and adaptive mesh framework over a wide spectrum of problems, boosts, and astrophysical applications, including relativistic shock tubes, shock collisions, magnetosonic shocks, Alfven wave propagation, blast waves, magnetized Bondi flow, and the magneto-rotational instability in Kerr black hole spacetimes.
Date:
May 6, 2005
Creator:
Anninos, P; Fragile, P C & Salmonson, J D
Object Type:
Article
System:
The UNT Digital Library
Catalyst and process development for synthesis gas conversion to isobutylene. Final report, September 1, 1990--January 31, 1994
Previous work on isosynthesis (conversion of synthesis gas to isobutane and isobutylene) was performed at very low conversions or extreme process conditions. The objectives of this research were (1) determine the optimum process conditions for isosynthesis; (2) determine the optimum catalyst preparation method and catalyst composition/properties for isosynthesis; (3) determine the kinetics for the best catalyst; (4) develop reactor models for trickle bed, slurry, and fixed bed reactors; and (5) simulate the performance of fixed bed trickle flow reactors, slurry flow reactors, and fixed bed gas phase reactors for isosynthesis. More improvement in catalyst activity and selectivity is needed before isosynthesis can become a commercially feasible (stand-alone) process. Catalysts prepared by the precipitation method show the most promise for future development as compared with those prepared hydrothermally, by calcining zirconyl nitrate, or by a modified sol-gel method. For current catalysts the high temperatures (>673 K) required for activity also cause the production of methane (because of thermodynamics). A catalyst with higher activity at lower temperatures would magnify the unique selectivity of zirconia for isobutylene. Perhaps with a more active catalyst and acidification, oxygenate production could be limited at lower temperatures. Pressures above 50 atm cause an undesirable shift in product …
Date:
May 6, 1994
Creator:
Anthony, R. G. & Akgerman, A.
Object Type:
Report
System:
The UNT Digital Library
Type-Writer.
Patent for a new device for typewriters which allows for shifting from lower case to upper case by means of "the one set of keys ordinarily employed, but of modified construction" (lines 14-15) including descriptions of the device, operation, and illustrations
Date:
May 6, 1902
Creator:
Austin, Thomas R.
Object Type:
Patent
System:
The Portal to Texas History
Independent Confirmatory Survey Summary and Results for the Plum Brook Reactor Facility Sandusky OH
The objectives of the confirmatory survey activities were to provide independent contractor field data reviews and to generate independent radiological data for use by the Nuclear Regulatory Commission (NRC) in evaluating the adequacy and accuracy of the licensee’s procedures and final status survey (FSS) results.
Date:
May 6, 2008
Creator:
Bailey, E.N.
Object Type:
Report
System:
The UNT Digital Library
The New Role of the Microchemostat in the Bioengineering Revolution
None
Date:
May 6, 2009
Creator:
Balagadde, F. K.
Object Type:
Article
System:
The UNT Digital Library