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391 Matching Results
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Molecular biological enhancement of coal biodesulfurization. [Rhodococcus, thiobacillus]
The objective of this project is to produce one or more microorganisms capable of removing the organic and inorganic sulfur in coal. The original specific technical objectives of the project were to: clone and characterize the genes encoding the enzymes of the 4S'' pathway (sulfoxide/sulfone/sulfonate/sulfate) for release of organic sulfur from coal; return multiple copies of genes to the original host to enhance the biodesulfurization activity of that organism; transfer this pathway into a fast-growing chemolithotropic bacterium; conduct a batch-mode optimization/analysis of scale-up variables.
Date:
June 14, 1990
Creator:
Litchfield, J. H.; Fry, I.; Wyza, R. E.; Palmer, D. T.; Zupancic, T. J. & Conkle, H. N.
Object Type:
Report
System:
The UNT Digital Library
NQR-NMR studies of higher alcohol synthesis Cu-Co catalysts
The primary objective of the project is to investigate the magnetic nature of the higher alcohol synthesis catalyst-Cu/Co supported on specific supports: chromia and titania with and without an alkali metal promoter, and examine the relations between catalytic and magnetic properties.
Date:
September 14, 1990
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Modeling of water spraying of field releases of hydrogen fluoride
The effectiveness of water sprays to absorb HF releases has been recently demonstrated by extended laboratory and field tests. In this paper computer simulations are presented of the Hawk, Nevada Test Site, series of field tests, along with parametric studies of several cases which have not been studied in the field. The model used in these simulations, HFSPRAY, treats the gas-phase as an Eulerean fluid whereas the spray is described according to the Lagrangian approach by a finite number of drops of varying size and trajectory. HFSPRAY simulates the momentum, mass and energy interactions between a water spray and a turbulent plume of HF in air; it is capable of predicting the flow velocities, temperature, water vapor and HF concentration fields in two-dimensional large-geometries, for spraying in any direction, (i.e., down-flow, inclined-down-flow, up-flow, and co-current horizontal flow). 15 refs., 21 figs.
Date:
October 14, 1990
Creator:
Fthenakis, V.M. (Brookhaven National Lab., Upton, NY (United States)); Schatz, K.W. (Mobil Research and Development Corp., Princeton, NJ (United States)) & Zakkay, V. (New York Univ., NY (United States). Dept. of Applied Science)
Object Type:
Article
System:
The UNT Digital Library
Photoinitiated electron transfer in multi-chromophoric species: Synthetic tetrads and pentads
This research project involves the design, synthesis and study of the molecules which mimic many of the important aspects of photosynthetic electron and energy transfer. Specifically, the molecules are designed to mimic the following aspects of natural photosynthetic multistep electron transfer: electron donation from a tetrapyrrole excited singlet state, electron transfer between tetrapyrroles, electron transfer from tetrapyrroles to quinones, and electron transfer between quinones with different redox properties. In addition, they model carotenoid antenna function in photosynthesis (singlet-singlet energy transfer from carotenoid polyenes to chlorophyll) and carotenoid photoprotection from singlet oxygen damage (triplet-triplet energy transfer from chlorophyll to carotenoids).
Date:
February 14, 1990
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
[News Clip: Housing - March]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, covering a news story by reporter about a large march involving housing issues for the homeless. This story aired at 10pm.
Date:
January 14, 1990
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Homeless]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, covering a news story by reporter Marty Griffin about the homeless and a Sunday religious service giving food and those fighting to raise awareness about the homeless problem. This story aired at 5pm.
Date:
January 14, 1990
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[Press release: House passes AIDS and homelessness bill; Dannemeyer takes a dive]
Press release announcing the House's approval for an AIDS homelessness bill.
Date:
June 14, 1990
Creator:
National Gay and Lesbian Task Force (U.S.)
Object Type:
Text
System:
The UNT Digital Library
[Press release: "Woodies" changes policy to include same-sex couples]
Press release announcing the successful efforts of the NGLTF and the GLAA to pressure a department store to change its policy on employee spouse discounts.
Date:
February 14, 1990
Creator:
National Gay and Lesbian Task Force]
Object Type:
Text
System:
The UNT Digital Library
The Tulia Herald (Tulia, Tex.), Vol. 82, No. 24, Ed. 1 Thursday, June 14, 1990
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
June 14, 1990
Creator:
Reynolds, Jim
Object Type:
Newspaper
System:
The Portal to Texas History
The Canadian Record (Canadian, Tex.), Vol. 100, No. 24, Ed. 1 Thursday, June 14, 1990
Weekly newspaper from Canadian, Texas that includes local, state and national news along with extensive advertising.
Date:
June 14, 1990
Creator:
Ezzell, Ben & Ezzell, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Raster data transfer test using optigraphics produced data: MIL-R- 28002 Type 1 (Raster)
The DoD Computer-aided Acquisition and Logistics Support (CALS) Test Network (CTN) is conducting tests of the military standard for the Automated interchange of Technical Information, MIL-STD-1840A, and its companion suite of specifications. The primary purpose of the CTN is to evaluate the effectiveness of the CALS standards for technical data interchange and to demonstrate the capability and operational suitability of these standards. This test was conducted to allow Optigraphics to demonstrate their ability to generated a MIL-R-28002 file. The objective was to evaluate their interpretation of the MIL-R-28002 standard thereby assist the CTN in substantiating the validity of the standards or recommending changes to these standards and the references to national or international standards.
Date:
June 14, 1990
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Spin observables for nucleon-nucleon elastic scattering at large momentum transfer
We discuss amplitudes for elastic nucleon-nucleon scattering at high energy. The helicity-conserving amplitudes are modeled using a combination of the quark-interchange and the Landshoff mechanisms of perturbative QCD. The relative normalization of these two sets of amplitudes involves a leading order form factor'' which we determine empirically. Our theoretically motivated amplitudes provide an economical description of a large body of existing data and make nontrivial predictions for spin observables. 8 refs., 4 figs.
Date:
August 14, 1990
Creator:
Ramsey, G.P. (Loyola Univ., Chicago, IL (USA). Dept. of Physics Argonne National Lab., IL (USA))
Object Type:
Article
System:
The UNT Digital Library
HYLIFE-II inertial confinement: Fusion power plant design
The HYLIFE-2 inertial fusion power plant design study uses a liquid fall, in the form of jets to protect the first structural wall from neutron damage, x rays, and blast to provide a 30-y lifetime. HYLIFE-1 used liquid lithium. HYLIFE 2 avoids the fire hazard of lithium by using a molten salt composed of fluorine, lithium, and beryllium (Li{sub 2}BeF{sub 4}) called Flibe. Access for heavy-ion beams is provided. Calculations for assumed heavy-ion beam performance show a nominal gain of 70 at 5 MJ producing 350 MJ, about 5.2 times less yield than the 1.8 GJ from a driver energy of 4.5 MJ with gain of 400 for HYLIFE-1. The nominal 1 GWe of power can be maintained by increasing the repetition rate by a factor of about 5.2, from 1.5 to 8 Hz. A higher repetition rate requires faster re-establishment of the jets after a shot, which can be accomplished in part by decreasing the jet fall height and increasing the jet flow velocity. Multiple chambers may be required. In addition, although not considered for HYLIFE-1, there is undoubtedly liquid splash that must be forcibly cleared because gravity is too slow, especially at high repetition rates. Splash removal can …
Date:
December 14, 1990
Creator:
Moir, Ralph W.
Object Type:
Article
System:
The UNT Digital Library
Applications of the operational method
New equations for continuous, operational interpolation on four plates in rectangular array are derived. The equations can be applied to the interpretation of experimental data. Other topics include convergence of operational formulas and extrapolation by operational methods. 11 refs.
Date:
November 14, 1990
Creator:
Silver, G.L.
Object Type:
Report
System:
The UNT Digital Library
(Characterization of lignin peroxidases from Phanerochaete)
Work has continued on characterizing the kinetics of lignin peroxidases and has now expanded to include the chemistry of Mn peroxidases. Progress in these two area in addition to the authors work on the molecular biology of lignin biodegradation is briefly described below. Copies of two reprints and one preprint which have resulted from the work are attached.
Date:
November 14, 1990
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Heavy ion beam and reactor chamber interface design
The design of the heavy-ion beam and the HYLIFE-II reactor chamber interface must provide final focusing quadruple triplets, neutron shielding, fast shutters, vapor condensation and pumping, thermal insulation, and blast resistant structures. The smallest half angle encompassing all beams striking the target might be {plus minus}14{degrees} for an array of 4 {times} 4 beams or {plus minus}9{degrees} if the four corner beams are eliminated, giving a 12-beam array. The target gain drops considerably from the 0{degree} published values because of this finite angle. The assumed one-sided irradiation reduces the number of bending magnets. A 350-MJ yield might be achieved with a 6-MJ driver (gain of 58) (nominal 1000 MWe net power with a repetition rate of 8 Hz). For either lower repetition rate or lower gain the yield must be increased by increasing the driver energy. The beam ports are protected from radiation by an array of vertical and horizontal, neutronically-thick, liquid jets. 6 refs., 7 figs.
Date:
December 14, 1990
Creator:
Moir, Ralph W.
Object Type:
Article
System:
The UNT Digital Library
Oscillating liquid flow ICF Reactor
Oscillating liquid flow in a falling molten salt inertial confinement fusion reactor is predicted to rapidly clear driver beam paths of residual liquid droplets. Oscillating flow will also provide adequate neutron and x-ray protection for the reactor structure with a short (2-m) fall distance permitting an 8 Hz repetition rate. A reactor chamber configuration is presented with specific features to clear the entire heavy-ion beam path of splashed molten salt. The structural components, including the structure between beam ports, are shielded. 3 refs., 12 figs.
Date:
December 14, 1990
Creator:
Petzoldt, R.W.
Object Type:
Article
System:
The UNT Digital Library
LLNL Waste Minimization Program Plan
This document is the February 14, 1990 version of the LLNL Waste Minimization Program Plan (WMPP). The Waste Minimization Policy field has undergone continuous changes since its formal inception in the 1984 HSWA legislation. The first LLNL WMPP, Revision A, is dated March 1985. A series of informal revision were made on approximately a semi-annual basis. This Revision 2 is the third formal issuance of the WMPP document. EPA has issued a proposed new policy statement on source reduction and recycling. This policy reflects a preventative strategy to reduce or eliminate the generation of environmentally-harmful pollutants which may be released to the air, land surface, water, or ground water. In accordance with this new policy new guidance to hazardous waste generators on the elements of a Waste Minimization Program was issued. In response to these policies, DOE has revised and issued implementation guidance for DOE Order 5400.1, Waste Minimization Plan and Waste Reduction reporting of DOE Hazardous, Radioactive, and Radioactive Mixed Wastes, final draft January 1990. This WMPP is formatted to meet the current DOE guidance outlines. The current WMPP will be revised to reflect all of these proposed changes when guidelines are established. Updates, changes and revisions to the …
Date:
February 14, 1990
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Raster data transfer test using GTX produced data: MIL-R-28002 Type 1 (Raster)
The DoD Computer-aided Acquisition and Logistics Support (CALS) Test Network (CTN) is conducting tests of the military standard for the Automated interchange of Technical Information, MIL-STD-1840A, and its companion suite of specifications. The primary purpose of the CTN is to evaluate the effectiveness of the CALS standards for technical data interchange and to demonstrate the capability and operational suitability of these standards. This test was conducted to allow GTX to demonstrate their ability to generated a MIL-R-28002 data file. The objective was to evaluate their interpretation of the MIL-R-28002 standard thereby assist the CTN in substantiating the validity of the standards or recommending changes to these standards and the references to national or international standards.
Date:
June 14, 1990
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Results from hadron colliders
The present status of hadron collider physics is reviewed. The total cross section for {bar p} + p has been measured at 1.8 TeV: {sigma}{sub tot} = 72.1 {plus minus} 3.3 mb. New data confirm the UA2 observation of W/Z {yields} {bar q}q. Precision measurements of M{sub W} by UA2 and CDF give an average value M{sub W} = 80.13 {plus minus} 0.30 GeV/c{sup 2}. When combined with measurements of M{sub Z} from LEP and SLC this number gives sin{sup 2}{theta}{sub W} = 0.227 {plus minus} 0.006, or m{sub top} = 130{sub {minus}60}{sup +40} GeV/c{sup 2} from the EWK radiative correction term {Delta}r. Evidence for hadron colliders as practical sources of b quarks has been strengthened, while searches for t quarks have pushed the mass above M{sub W}: m{sub top} > 89 GeV/c{sup 2} 95% cl (CDF Preliminary). Searches beyond the standard model based on the missing E{sub T} signature have not yet produced any positive results. Future prospects for the discovery of the top quark in the range m{sub top} < 200 GeV/c{sup 2} look promising. 80 refs., 35 figs., 7 tabs.
Date:
December 14, 1990
Creator:
Pondrom, L.G. (Wisconsin Univ., Madison, WI (USA))
Object Type:
Article
System:
The UNT Digital Library
A new approach to chiral fermions on the lattice
We wish to describe a method for formulating, on the lattice, field theories that contain Dirac particles with chiral couplings to gauge fields. As is well-known, the most straight-forward lattice transcription of the continuum action for a Dirac particle leads to the doubling problem: for every particle of a given chirality in the continuum theory, there appear on the lattice, in d dimensions, 2{sup d} particles, with equal numbers of particles of left- and right-handed chirality. No-go theorems, state that it is impossible to eliminate the doubling problem and still maintain an exact chiral gauge symmetry. Rather than follow an approach that attempts to circumvent the no-go theorems we, instead, explore the possibility of abandoning exact chiral symmetry.
Date:
November 14, 1990
Creator:
Bodwin, G.T. (Argonne National Lab., IL (USA)) & Kovacs, E.V. (Fermi National Accelerator Lab., Batavia, IL (USA))
Object Type:
Article
System:
The UNT Digital Library
Nuclear shell model calculations with non-local interactions
It is becoming clearer with time that non-locality of the nucleon-nucleon interaction can play a significant role in nuclear properties. In this talk we review evidence for such non-locality. Then, using a Gaussian interaction, we discuss the effect of non-locality on two body matrix elements in the nuclear shell model. Finally, we mention some applications. For example, non-locality leads to faster convergence of off-diagonal matrix elements.
Date:
October 14, 1990
Creator:
Moszkowski, S.A. (California Univ., Los Angeles, CA (USA). Dept. of Physics); Bloom, S.D. & Resler, D.A. (Lawrence Livermore National Lab., CA (USA))
Object Type:
Article
System:
The UNT Digital Library
HYLIFE-II inertial confinement fusion reactor design
The HYLIFE-2 inertial fusion power plant design study uses a liquid fall, in the form of jets to protect the first structural wall from neutron damage, x rays, and blast to provide a 30-y lifetime. HYLIFE-1 used liquid lithium. HYLIFE 2 avoids the fire hazard of lithium by using a molten salt composed of fluorine, lithium, and beryllium (Li{sub 2}BeF{sub 4}) called Flibe. Access for heavy-ion beams is provided. Calculations for assumed heavy-ion beam performance show a nominal gain of 70 at 5 MJ producing 350 MJ, about 5.2 times less yield than the 1.8 GJ from a driver energy of 4.5 MJ with gain of 400 for HYLIFE-1. The nominal 1 GWe of power can be maintained by increasing the repetition rate by a factor of about 5.2, from 1.5 to 8 Hz. A higher repetition rate requires faster re-establishment of the jets after a shot, which can be accomplished in part by decreasing the jet fall height and increasing the jet flow velocity. Multiple chambers may be required. In addition, although not considered for HYLIFE-1, there is undoubtedly liquid splash that must be forcibly cleared because gravity is too slow, especially at high repetition rates. Splash removal can …
Date:
December 14, 1990
Creator:
Moir, Ralph W.
Object Type:
Article
System:
The UNT Digital Library
Raster data transfer test using Formtek produced data: MIL-R-28002 Type 1 (Raster)
The DoD Computer-aided Acquisition and Logistics Support (CALS) Test Network (CTN) is conducting tests of the military standard for the Automated interchange of Technical Information, MIL-STD-1804A, and its companion suite of specifications. The CTN is a DoD sponsored confederation of voluntary participants from industry and government, managed by the Air Force Logistics Command. The primary purpose of the CTN is to evaluate the effectiveness of the CALS standards for technical data interchange and to demonstrate the capability and operational suitability of these standards. To this end, testing should represent the systems and applications in use by a large number of participants. Sampling a wide cross section of industry and government will gain feedback on the various interpretations of the standards and broaden the base of industry participation in the CALS initiative. This test was conducted to allow Formtek to demonstrate their ability to generated a MIL-R-28002 data file. The objective was to evaluate their interpretation of the MIL-R-28002 standard thereby assist the CTN in substantiating the validity of the standards or recommending changes to these standards and the references to national or international standards. Additionally, Quick Short Test Reports (QSTRs) are intended to promote industry and government participation in the …
Date:
June 14, 1990
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library