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Mechanisms and genetic control of interspecific crossing barriers in lycopersicon. Progress report, First year, August 1, 1992
The goal of this program is to use Lycopersica esculentum and L. pennellii as a model system to study the interspecific reproductive barriers unilateral incongruity (UI), hybrid breakdown and interspecific aberrant ratio syndrome (IARS). Specifically we seek to determine the functional basis of UI including the timing of the failure of incongruous crosses, the developmental step(s) interrupted by UI, the tissue and genomes involved in UI.
Date:
December 31, 1992
Creator:
Mutschler, M. A. & McCormick, S.
Object Type:
Report
System:
The UNT Digital Library
Environmental assessment for the decommissioning and decontamination of contaminated facilities at the Laboratory for Energy-Related Health Research University of California, Davis
The Laboratory for Energy-Related Health Research (LEHR) was established in 1958 at its present location by the Atomic Energy Commission. Research at LEHR originally focused on the health effects from chronic exposures to radionuclides, primarily strontium 90 and radium 226, using beagles to simulate radiation effects on humans. In 1988, pursuant to a memorandum of agreement between the US Department of Energy (DOE) and the University of California, DOE`s Office of Energy Research decided to close out the research program, shut down LEHR, and turn the facilities and site over to the University of California, Davis (UCD) after remediation. The decontamination and decommissioning (D&D) of LEHR will be managed by the San Francisco Operations Office (SF) under DOE`s Environmental Restoration Program. This environmental assessment (EA) addresses the D&D of four site buildings and a tank trailer, and the removal of the on-site cobalt 60 (Co-60) source. Future activities at the site will include D&D of the Imhoff building and the outdoor dog pens, and may include remediation of underground tanks, and the landfill and radioactive disposal trenches. The remaining buildings on the LEHR site are not contaminated. The environmental impacts of the future activities cannot be determined at this time …
Date:
September 1, 1992
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Application of multitracer technology to petroleum reservoir studies. Quarterly progress report, April 1--June 30, 1992
The objectives of this research program are to: Improve the assessment of the character of petroleum reservoirs using tracer technology for the monitoring and improvement of EOR techniques, specifically, (a) to apply the presently available multitracer perfluorocarbon tracer (PFI) technology to the study of petroleum reservoirs in characterizing reservoir bulk subsurface flow transport and dispersion rates; and (b) to demonstrate that PFTs with differing physical properties will interact with differing rates of adsorption and dispersion within such reservoirs, from which may be inferred difference in the character and/or extent of petroleum in those reservoirs. Develop additional tracers, and tracer injection, sampling and analyses methodologies for use in petroleum reservoir characterization experiments. Develop a data base of petroleum transport and dispersion properties from tracer experiments for use by modellers for developing, validating and extending petroleum reservoirs models used for characterizing petroleum reservoirs. Technical progress is discussed according to the three ongoing field experiments at the Naval Petroleum Reserve in California (NPRC).
Date:
September 1, 1992
Creator:
Senum, G. I.
Object Type:
Report
System:
The UNT Digital Library
Application of multitracer technology to petroleum reservoir studies. [Perfluorocarbon tracer technology]
The objectives of this research program are to: Improve the assessment of the character of petroleum reservoirs using tracer technology for the monitoring and improvement of EOR techniques, specifically, (a) to apply the presently available multitracer perfluorocarbon tracer (PFI) technology to the study of petroleum reservoirs in characterizing reservoir bulk subsurface flow transport and dispersion rates; and (b) to demonstrate that PFTs with differing physical properties will interact with differing rates of adsorption and dispersion within such reservoirs, from which may be inferred difference in the character and/or extent of petroleum in those reservoirs. Develop additional tracers, and tracer injection, sampling and analyses methodologies for use in petroleum reservoir characterization experiments. Develop a data base of petroleum transport and dispersion properties from tracer experiments for use by modellers for developing, validating and extending petroleum reservoirs models used for characterizing petroleum reservoirs. Technical progress is discussed according to the three ongoing field experiments at the Naval Petroleum Reserve in California (NPRC).
Date:
September 1, 1992
Creator:
Senum, G. I.
Object Type:
Report
System:
The UNT Digital Library
Fast magnetic field penetration into an intense neutralized ion beam
Experiments involving propagation of neutralized ion beams across a magnetic field indicate a magnetic field penetration time determined by the Hall resistivity rather than the Spitzer or Pedersen resistivity. In magnetohydrodynamics the Hall current is negligible because electrons and ions drift together in response to an electric field perpendicular to the magnetic field. For a propagating neutralized ion beam, the ion orbits are completely different from the electron orbits and the Hall current must be considered. There would be no effect unless there is a component of magnetic field normal to the surface which would usually be absent for a good conductor. It is necessary to consider electron inertia and the consequent penetration of the normal component to a depth c/{omega}{sub p}. In addition it is essential to consider a component of magnetic field parallel to the velocity of the beam which may be initially absent, but is generated by the Hall effect. The penetration time is determined by whistler waves rather than diffusion.
Date:
June 1, 1992
Creator:
Armale, R. (Texas Univ., Austin, TX (United States). Inst. for Fusion Studies) & Rostoker, N. (California Univ., Irvine, CA (United States))
Object Type:
Report
System:
The UNT Digital Library
Pulse-by-pulse energy measurement at the Stanford Linear Collider
The stanford Linear Collider (SLC) collides a beam of electrons and positrons at 92 GeV. It is the first colliding linac, and produces Z{sup 0} particles for High-Energy Physics measurements. The energy of each beam must be measured to one part in 10{sup 4} on every collision (120 Hz). An Energy Spectrometer in each beam line after collision produces two stripes of high-energy synchrotron radiation with critical energy of a few MeV. The distance between these two stripes at an imaging plane measures the beam energy. The Wire- Imaging Synchrotron Radiation Detector (WISRD) system comprises a novel detector, data acquisition electronics, readout and analysis. The detector comprises an array of wires for each synchrotron stripe. The electronics measure secondary emission charge on each wire of each array. A Macintosh II (using THINK C, THINK Class Library) and DSP coprocessor (using ANSI C) acquire and analyze the data, and display and report the results for SLC operation.
Date:
January 1, 1992
Creator:
Blaylock, G. (California Univ., Santa Cruz, CA (United States)); Briggs, D.; Collins, B. & Petree, M. (Stanford Linear Accelerator Center, Menlo Park, CA (United States))
Object Type:
Article
System:
The UNT Digital Library
Proxy and in-situ studies of dayside magnetopause reconnection
The functional dependence of magnetic reconnection on solar wind parameters is examined utilizing the am geomagnetic index and satellite observations at the magnetopause. Several parameters in the solar wind are found to control geomagnetic activity. Reconnection is found to be most efficient when the interplanetary magnetic field is southward, although some activity remains when the IMF is horizontal and slightly northward. The reconnection efficiency increases with the solar wind dynamic pressure but decreases when the Mach number is greater than 7.5. These results are compared with the functional dependencies found by correlating solar wind and magnetosheath measurements with observations of accelerated tows at the magnetopause. Accelerated tows are found to occur most often when the interplanetary magnetic field is directed southward. However, accelerated flows do occur when the IMF is horizontal and northward. Accelerated flows are also affected by the magnetosheath beta such that higher beta inhibits their occurrence. The location of accelerated tows indicates that reconnection occurs mainly at the subsolar point.
Date:
January 1, 1992
Creator:
Scurry, L.; Russell, C.T. (California Univ., Los Angeles, CA (United States). Inst. of Geophysics and Planetary Physics) & Gosling, J.T. (Los Alamos National Lab., NM (United States))
Object Type:
Article
System:
The UNT Digital Library
Thermodynamics and transport in Ce sub 3 Bi sub 4 Pt sub 3 and related compounds
The transport and thermodynamic properties of the small-gap semiconductor Ce{sub 3}Bi{sub 4}Pt{sub 3} are reviewed and discussed in relation to other Kondo insulators and metals. The data are consistent with the small-gap semiconductors being Kondo-like metals at temperatures T {ge} E{sub g}/k{sub B}. Kondo insulators appear to be an unusually simple realization of the Anderson Lattice Hamiltonian in which the lower hybridization band is exactly filled, or in Kondo language, the Abrikosov-Suhl resonance exactly fills a Brillouin zone. 8 figs, 40 refs. (DLC)
Date:
January 1, 1992
Creator:
Thompson, J. D.; Canfield, P. C.; Fisk, Z.; Hundley, M. F.; Kwei, G. H.; Lacerda, A. (Los Alamos National Lab., NM (United States)) et al.
Object Type:
Article
System:
The UNT Digital Library
An electronic stroll through the global village
This paper is a semi-random walk through Usenet News, a bulletin board system that exists on the vast Internet computer network. Interaction in such a medium is an interesting hybrid of speech and writing, of monologue and dialogue and sometimes an open shouting match in a crowded room. Those who are intrigued by these matters will be able to see a number of research areas exposed in this frankly anecdotal paper. In addition to being anecdotal, this paper is a work of participatory observation. In fact, I occasionally let it be known that I was observing the sociology and rhetoric of the newsgroups. The natives appeared unimpressed.
Date:
September 1, 1992
Creator:
Chew, J.
Object Type:
Article
System:
The UNT Digital Library
An electronic stroll through the global village
This paper is a semi-random walk through Usenet News, a bulletin board system that exists on the vast Internet computer network. Interaction in such a medium is an interesting hybrid of speech and writing, of monologue and dialogue and sometimes an open shouting match in a crowded room. Those who are intrigued by these matters will be able to see a number of research areas exposed in this frankly anecdotal paper. In addition to being anecdotal, this paper is a work of participatory observation. In fact, I occasionally let it be known that I was observing the sociology and rhetoric of the newsgroups. The natives appeared unimpressed.
Date:
September 1, 1992
Creator:
Chew, J.
Object Type:
Article
System:
The UNT Digital Library
Anti-hydrogen: The cusp between quantum mechanics and general relativity
We argue that the crossing (CPT) symmetry of relativistic quantum mechanics requires that both the coulombic and the Newtonian force between pairs of particles will reverse when one is replaced by its anti-particle. For consistency, this requires a theory in which both the equivalence principles and gauge invariance are abandoned. thus whether anti-hydrogen ``falls`` up or down will provide an experiment crusis separating general relativity and gauge invariance from this version of quantum mechanics.
Date:
September 1, 1992
Creator:
Noyes, H. P.
Object Type:
Article
System:
The UNT Digital Library
Anti-hydrogen: The cusp between quantum mechanics and general relativity
We argue that the crossing (CPT) symmetry of relativistic quantum mechanics requires that both the coulombic and the Newtonian force between pairs of particles will reverse when one is replaced by its anti-particle. For consistency, this requires a theory in which both the equivalence principles and gauge invariance are abandoned. thus whether anti-hydrogen falls'' up or down will provide an experiment crusis separating general relativity and gauge invariance from this version of quantum mechanics.
Date:
September 1, 1992
Creator:
Noyes, H. P.
Object Type:
Article
System:
The UNT Digital Library
RF voltage modulation at discrete frequencies with applications to crystal channeling extraction
RF voltage modulation at a finite number of discrete frequencies is described in a Hamiltonian resonance framework. The theory is applied to the problem of parasitic extraction of a fixed target beam from a high energy proton collider, using a bent crystal as a thin septum'' within an effective width of about one micron. Three modes of employment of discrete resonances are proposed.First, a single relatively strong static drive'' resonance may be used to excite a test proton so that it will penetrate deeply into the channeling crystal. Second, a moderately strong feed'' resonance with a ramped modulation tune may be used to adiabatically trap protons near the edge of the beam core, and transport them to the drive resonance. Third, several weak resonances may be overlapped to create a chaotic amplitude band, either to transport protons to the drive resonance, or to provide a pulse stretching'' buffer between a feed resonance and the drive resonance. Extraction efficiency is semi- quantitatively described in terms of characteristic penetration,'' depletion,'' and repetition'' times. simulations are used to quantitatively confirm the fundamental results of the theory, and to show that a prototypical extraction scheme using all three modes promises good extraction performance.
Date:
May 1, 1992
Creator:
Gabella, W.; Rosenzweig, J. (California Univ., Los Angeles, CA (United States). Dept. of Physics); Kick, R. (Illinois Math and Science Academy, Aurora, Illinois (United States)) & Peggs, S. (Fermi National Accelerator Lab., Batavia, IL (United States))
Object Type:
Report
System:
The UNT Digital Library
SLD liquid argon calorimeter
The liquid argon calorimeter (LAC) of the SLD detector is a parallel plate -- liquid argon sampling calorimeter, used to measure particle energies in Z{sup 0} decays at the Stanford Linear Collider. The LAC module design is based on a unique projective tower structure, in which lead plates and segmented lead tiles serve both as absorbers and electrodes. The LAC front end electronics incorporates several novel features, including extensive multiplexing and optical fiber readout, which take advantage of the low SLC beam crossing frequency. The operational performance of the LAC during the recently completed SLD physics run (which recorded over 10,000 Z{sup 0} events) is discussed.
Date:
October 1, 1992
Creator:
Vella, E.
Object Type:
Article
System:
The UNT Digital Library
SLD liquid argon calorimeter
The liquid argon calorimeter (LAC) of the SLD detector is a parallel plate -- liquid argon sampling calorimeter, used to measure particle energies in Z[sup 0] decays at the Stanford Linear Collider. The LAC module design is based on a unique projective tower structure, in which lead plates and segmented lead tiles serve both as absorbers and electrodes. The LAC front end electronics incorporates several novel features, including extensive multiplexing and optical fiber readout, which take advantage of the low SLC beam crossing frequency. The operational performance of the LAC during the recently completed SLD physics run (which recorded over 10,000 Z[sup 0] events) is discussed.
Date:
October 1, 1992
Creator:
Vella, E.
Object Type:
Article
System:
The UNT Digital Library
A new concept for an asymmetric {Phi} factory to test CPT and study K{sub s}{sup 0} mesons
We propose a new type of e{sup +}e{sup {minus}} collider with approximately co-linear beams that interact at small angles to produce energetic mesons and K{sub s}{sup 0}, K{sub L}{sup 0} beams. We apply this concept to the collision of a 2 GeV e{sup {minus}} linear accelerator and a compact 1 GeV e{sup +} storage ring and show how high luminosity operation might be achieved as well as a crab crossing geometry. We discuss the experimental advantages of this scheme for producing energetic K{sub s}{sup 0} beams and {phi} {yields} K{sub S}K{sub L} interference compared to conventional {phi} factories.
Date:
December 31, 1992
Creator:
Cline, D. B.
Object Type:
Article
System:
The UNT Digital Library
Theory of Rotational Population Patterns in Heavy-Ion Transfer Reactions: Even-Even Thorium Nuclei
A Hamiltonian matrix diagonalization (HMD) method is applied to calculate the lowest several bands in {sup 230,232,234}Th. Neutron pair transfer strength distributions are calculated and compared between HMD and cranked Hartree-Fock-Bogoliubov plus Random Phase Approximation (CHFB+RPA). Sudden-approximation methods are applied to estimate pair transfer population patterns in {sup 206}Pb + {sup 232}Th reactions. Band-crossing, pairing, and spin alignment properties are also discussed.
Date:
November 1992
Creator:
Chu, S. Y.; Rasmussen, J. O.; Donangelo, R.; Stoyer, M. A.; Frauendorf, S. & Shimizu, Y. R.
Object Type:
Article
System:
The UNT Digital Library
Theory of rotational population patterns in heavy-ion transfer reactions: Even-even thorium nuclei
A Hamiltonian matrix diagonalization (HMD) method is applied to calculate the lowest several bands in [sup 230,232,234]Th. Neutron pair transfer strength distributions are calculated and compared between HMD and cranked Hartree-Fock-Bogoliubov plus Random Phase Approximation (CHFB+RPA). Sudden-approximation methods are applied to estimate pair transfer population patterns in [sup 206]Pb + [sup 232]Th reactions. Band-crossing, pairing, and spin alignment properties are also discussed.
Date:
November 1, 1992
Creator:
Chu, S.Y.; Rasmussen, J.O. (Lawrence Berkeley Lab., CA (United States)); Donangelo, R. (Universidade Federal, Rio de Janeiro, RJ (Brazil)); Stoyer, M.A. (Lawrence Livermore National Lab., CA (United States)); Frauendorf, S. (Institut fuer Kern- und Hadronenphysik, Forchungszentrum Rossendorf, Dresden (Germany)) & Shimizu, Y.R. (Kyushu Univ., Fukuoka (Japan). Dept. of Physics)
Object Type:
Article
System:
The UNT Digital Library
A new concept for an asymmetric [Phi] factory to test CPT and study K[sub s][sup 0] mesons
We propose a new type of e[sup +]e[sup [minus]] collider with approximately co-linear beams that interact at small angles to produce energetic mesons and K[sub s][sup 0], K[sub L][sup 0] beams. We apply this concept to the collision of a 2 GeV e[sup [minus]] linear accelerator and a compact 1 GeV e[sup +] storage ring and show how high luminosity operation might be achieved as well as a crab crossing geometry. We discuss the experimental advantages of this scheme for producing energetic K[sub s][sup 0] beams and [phi] [yields] K[sub S]K[sub L] interference compared to conventional [phi] factories.
Date:
January 1, 1992
Creator:
Cline, D. B.
Object Type:
Article
System:
The UNT Digital Library
Applicability of petroleum horizontal drilling technology to hazardous waste site characterization and remediation
Horizontal wells have the potential to become an important tool for use in characterization, remediation and monitoring operations at hazardous waste disposal, chemical manufacturing, refining and other sites where subsurface pollution may develop from operations or spills. Subsurface pollution of groundwater aquifers can occur at these sites by leakage of surface disposal ponds, surface storage tanks, underground storage tanks (UST), subsurface pipelines or leakage from surface operations. Characterization and remediation of aquifers at or near these sites requires drilling operations that are typically shallow, less than 500-feet in depth. Due to the shallow nature of polluted aquifers, waste site subsurface geologic formations frequently consist of unconsolidated materials. Fractured, jointed and/or layered high compressive strength formations or compacted caliche type formations can also be encountered. Some formations are unsaturated and have pore spaces that are only partially filled with water. Completely saturated underpressured aquifers may be encountered in areas where the static ground water levels are well below the ground surface. Each of these subsurface conditions can complicate the drilling and completion of wells needed for monitoring, characterization and remediation activities. This report describes some of the equipment that is available from petroleum drilling operations that has direct application to groundwater …
Date:
September 1, 1992
Creator:
Goranson, C.
Object Type:
Report
System:
The UNT Digital Library
Applicability of petroleum horizontal drilling technology to hazardous waste site characterization and remediation
Horizontal wells have the potential to become an important tool for use in characterization, remediation and monitoring operations at hazardous waste disposal, chemical manufacturing, refining and other sites where subsurface pollution may develop from operations or spills. Subsurface pollution of groundwater aquifers can occur at these sites by leakage of surface disposal ponds, surface storage tanks, underground storage tanks (UST), subsurface pipelines or leakage from surface operations. Characterization and remediation of aquifers at or near these sites requires drilling operations that are typically shallow, less than 500-feet in depth. Due to the shallow nature of polluted aquifers, waste site subsurface geologic formations frequently consist of unconsolidated materials. Fractured, jointed and/or layered high compressive strength formations or compacted caliche type formations can also be encountered. Some formations are unsaturated and have pore spaces that are only partially filled with water. Completely saturated underpressured aquifers may be encountered in areas where the static ground water levels are well below the ground surface. Each of these subsurface conditions can complicate the drilling and completion of wells needed for monitoring, characterization and remediation activities. This report describes some of the equipment that is available from petroleum drilling operations that has direct application to groundwater …
Date:
September 1, 1992
Creator:
Goranson, C.
Object Type:
Report
System:
The UNT Digital Library
Central Collisions of Heavy Ions. Progress Report, October 1, 1991--September 31, 1992
This report describes the activities of the Heavy Ion Physics Group at the University of California, Riverside from October 1, 1991 to September 30, 1992. During this period, the program focused on particle production at AGS energies, and correlation studies at the Bevalac in nucleus-nucleus central collisions. As part of the PHENIX collaboration, contributions were made to the Preliminary Conceptual Design Report (pCDR), and work on a RHIC silicon microstrip detector R&D project was performed.
Date:
October 1, 1992
Creator:
Fung, Sun-yiu
Object Type:
Report
System:
The UNT Digital Library
Central Collisions of Heavy Ions
This report describes the activities of the Heavy Ion Physics Group at the University of California, Riverside from October 1, 1991 to September 30, 1992. During this period, the program focused on particle production at AGS energies, and correlation studies at the Bevalac in nucleus-nucleus central collisions. As part of the PHENIX collaboration, contributions were made to the Preliminary Conceptual Design Report (pCDR), and work on a RHIC silicon microstrip detector R D project was performed.
Date:
October 1, 1992
Creator:
Fung, Sun-yiu
Object Type:
Report
System:
The UNT Digital Library
D0 triggering and data acquisition
The trigger for D0 is a multi-tier system. Within the 3.5 {mu}sec bunch crossing interval, custom electronics select interesting event candidates based on electromagnetic and hadronic energy deposits in the calorimeter and on indications of tracks in the muon system. Subsequent hardware decisions use refined calculations of electron and muon characteristics. The highest level trigger occurs in one element of a farm of microprocessors, where fully developed algorithms for electrons, muons, jets, or missing E{sub t} are executed. This highest level trigger also provides the assembly of the event into its final data structure. Performance of this trigger and data acquisition system in collider operation is described.
Date:
October 1, 1992
Creator:
Gibbard, B. & Collaboration, The D0
Object Type:
Article
System:
The UNT Digital Library