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Pion correlations as a function of atomic mass in heavy ion collisions
The method of two pion interferometry was used to obtain source-size and lifetime parameters for the pions produced in heavy ion collisions. The systems used were 1.70 {center dot} A GeV {sup 56}Fe + Fe, 1.82 {center dot} A GeV {sup 40}Ar + KCl and 1.54 {center dot} A GeV {sup 93}Nb + Nb, allowing for a search for dependences on the atomic number. Two acceptances (centered, in the lab., at {approximately} 0{degrees} and 45{degrees}) were used for each system, allowing a search for dependences on the viewing angle. The correlation functions were calculated by comparing the data samples to background (or reference) samples made using the method of event mixing, where pions from different events are combined to produce a data sample in which the Bose-Einstein correlation effect is absent. The effect of the correlation function on the background samples is calculated, and a method for weighting the events to remove the residual correlation effect is presented. The effect of the spectrometer design on the measured correlation functions is discussed, as are methods for correcting for these effects during the data analysis. 58 refs., 39 figs., 18 tabs.
Date:
November 26, 1989
Creator:
Chacon, A.D.
Object Type:
Report
System:
The UNT Digital Library
[Letter from Jack Davis and Bill McCarter, to Linus Wright, June 26, 1987]
Photocopy of a letter from Jack Davis and Bill McCarter, co-directors of North Texas Institute for Educators on the Visual Arts, to Linus Wright, Superintendent of Dallas ISD. Davis and McCarter regret that Wright was unable to join them for the executive briefing on the North Texas Regional Institute for Educators on the Visual Arts, "North Texas Institute for Educators on the Visual Arts" (NTIEVA), Wednesday, June 19. Following the briefing was an all-day workshop, Friday, June 21 which was attended by staff representatives from each consortium in the Institute, to discuss grant proposals which with offer opportunities for staff development and curriculum implementation in the visual arts. Enclosed at the end of the letter to Wright is information the functional committees and their list of responsibilities, for the upcoming Matching Funds Advisory Committee and Wright's assistance in its regard. Enclosed information not present with letter.
Date:
June 26, 1987
Creator:
Davis, Donald Jack & McCarter, William
Object Type:
Letter
System:
The UNT Digital Library
Development of superconductors for applications in high-field, high-current-density magnets for fusion research
The development of large-bore, high-field magnets for fusion energy applications requires a system approach to both magnet and conductor design. At Lawrence Livermore National Laboratory (LLNL), the criteria used to choose superconductors include: strain tolerance, radiation tolerance, heat removal, stability, fabricability, and cost. We report on the performance of industrially produced, prototype, Ti-modified Nb/sub 3/Sn wires developed with LLNL support. Wire performance characteristics evaluated include critical current as a function of magnetic field, temperature, and applied strain. Tests were performed to determine how this performance translates to the performance of a cable-in-conduit conductor system using this wire. An alternative to Nb/sub 3/Sn superconductors is NbN, which is strain and radiation insensitive. We report preliminary efforts to produce multifilamentary NbN conductors by liquid-metal infiltration of NbN-coated, high-strength fibers. In addition, we discuss the fabrication of multifilamentary NbN conductors and their possible impact on magnet design.
Date:
September 26, 1986
Creator:
Summers, L. T. & Miller, J. R.
Object Type:
Article
System:
The UNT Digital Library
Conspray dynamic sleeve piston coal feeder. Phase II. Verification tests. Final technical report
This report details the performance of Phase II: Verification Tests of the Conspray dynamic sleeve piston coal feeder. The machine performed for 200 hours at 700 psi backpressure, utilizing a 70% to 200 mesh Utah bituminous coal as feedstock. All test work was satisfactorily completed. A post-test inspection was performed. A report of component wear and failures incurred in testing is included as well as suggestions for machine upgrades. The overall conclusion is that the dynamic sleeve piston feeder has proven its ability to operate safely and reliably. When problems have occurred, the machine has demonstrated inherent safety by shutting down without endangering process or personnel. With the recommended improvements incorporated into the feeder, the unit will be ready for installation on a pilot scale coal gasifier. 9 figures, 11 tables.
Date:
January 26, 1984
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Atom-in-jellium models
The author describes in this paper the atom-in-jellium calculations he has been doing over the last ten years. He tries to emphasize reasons for doing this sort of calculations and why he devised a model which is different in some respects from others.
Date:
April 26, 1985
Creator:
Liberman, D.A.
Object Type:
Article
System:
The UNT Digital Library
Tevatron I: Large Bore Quad lamination analysis
Stacking, compression, and welding of the laminations for the TeV I Large Bore Quad results in a deformation due to springback which is unacceptable due to magnetic field requirements. ANSYS has been used to analyze a solution to this problem.
Date:
October 26, 1982
Creator:
Leininger, M.
Object Type:
Report
System:
The UNT Digital Library
Technical evaluation report on the proposed design modifications and technical-specification changes on grid voltage degradation for the San Onofre Nuclear Genetating Station, Unit 1
This report documents the technical evaluation of the proposed design modifications and Technical Specification changes for protection of Class 1E equipment from grid voltage degradation for the San Onofre Nuclear Generating Station, Unit 1. The review criteria are based on several IEEE standards and the Code of Federal Regulations. The evaluation finds that the proposed design modifications and Technical Specification changes will ensure that the Class 1E equipment will be protected from sustained voltage degradation.
Date:
May 26, 1982
Creator:
Selan, J.C.
Object Type:
Report
System:
The UNT Digital Library
Interferometric measurements of multilayer and double shell inertial fusion targets
Optical interference microscopy plays an important role in the measurement of targets for inertial confinement fusion experiments. We describe how these techniques are applied to the measurement of thickness and refractive index of multilayer films on both flat substrates and microsphere targets. We also discuss procedures for manipulating and examining microsphere targets to measure defects and wall thickness variations anywhere on the target. Finally, we describe the use of optical interferometry to measure the individual components and final assembled structure of double-shell targets. The accuracy of these measurements is from 0.03 to 0.5 ..mu..m, depending on the specific application.
Date:
August 26, 1980
Creator:
Weinstein, B.W.; Weir, J.T. & Willenborg, D.L.
Object Type:
Article
System:
The UNT Digital Library
Use of molecular beams to support microspheres during plasma coating
Spherical laser fusion targets can be levitated on beams of Ar or other gas atoms. This is an especially useful and reliable technique for supporting microspheres during plasma coating or plasma etching. The reliability of this technique is principally the result of two things: the success of a special centering device which provides a lateral, stabilizing force on the levitated microspheres; and a gas handling system which is capable of controlling levitation gas flow in the microtorr liter/sec range. We have determined that the operational regime of this device is that of Knudsen's flow. This knowledge of the flow characteristics has been important in developing this device.
Date:
August 26, 1980
Creator:
Crane, J. K.; Smith, R. D.; Johnson, W. L.; Letts, S. A.; Korbel, G. R. & Krenick, R. M.
Object Type:
Article
System:
The UNT Digital Library
Production of slow-positron beams with an electron linac
Intense, pulsed beams of low-energy positrons have been produced by a high-energy beam from an electron linac. The production efficiency for low-energy positrons has been determined for electrons with 60 to 120 MeV energy, low-energy positron beams from a linac can be of much higher intensity than those beams currently derived from radioactive sources.
Date:
March 26, 1982
Creator:
Howell, R. H.; Alvarez, R. A. & Stanek, M.
Object Type:
Article
System:
The UNT Digital Library
Structural Changes Observed in (Mo /sub 6/Ru /sub 4/)/sub x/B/sub 1-x/ Amorphous Alloys Observed with Positron Annihilation
Changes in the structure of (Mo /sub 6/Ru /sub 4/)/sub x/B/sub 1-x/ amorphous alloys were observed in positron annihilation analysis using both positron lifetime and Doppler broadening techniques. The changes were introduced into the alloy either by varying the boron fraction or by neutron irradiation. Similar results were observed both in the irradiated alloys and those with vacant boron sites. The positron annihilation data suggest that the modified structure contains regions of open volume and that the positrons interact with those regions.
Date:
March 26, 1982
Creator:
Howell, R. H. & Johnson, W. L.
Object Type:
Article
System:
The UNT Digital Library
A microwiggler Free-Electron Laser at the Brookhaven Accelerator Test Facility
We report the design and status of an FEL experiment at the Brookhaven National Laboratory Accelerator Test Facility. A 50 MeV high brightness electron beam will be utilized for an oscillator experiment in the visible wavelength region. The microwiggler to be used is a superferric planar undulator with a 0.88 cm period, 60 cm length and K = 0.35. The optical cavity is a 368 cm long stable resonator with broadband dielectric coated mirrors. 8 refs., 2 figs., 4 tabs.
Date:
September 26, 1989
Creator:
Batchelor, K.; Ben-Zvi, Ilan; Fernow, R.; Gallardo, J.; Kirk, H.; Pellegrini, C. et al.
Object Type:
Report
System:
The UNT Digital Library
A C programmer's view of a relational database
The AGS Distributed Control System (AGSDCS) uses a relational database (Interbase) for the storage of all data on the host system network. This includes the static data which describes the components of the accelerator complex, as well as data for application program setup and data records that are used in analysis. By creating a mapping of each elation in the database to a C record and providing general tools for relation (record) across, all the data in the database is available in a natural fashion (in structures) to all the C programs on any of the nodes of the control system. In this paper the correspondence between the Interbase elations and the C structure is detailed with examples of C typedefs and relation definitions. It is also shown how the relations can be put into memory and linked (related) together when fast access is needed by programs. 1 ref., 2 tabs.
Date:
October 26, 1989
Creator:
Clifford, T.; Katz, R. & Griffiths, C.
Object Type:
Article
System:
The UNT Digital Library
Hydrodesulfurization and hydrodenitrogenation catalysts obtained from coal mineral matter. [Patent application]
A hydrotreating catalyst is prepared from coal mineral matter obtained by low temperature ashing coals of relatively low bassanite content by the steps of: (a) depositing on the low temperature ash 0.25 to 3 grams of an iron or nickel salt in water per gram of ash and drying a resulting slurry; (b) crushing and sizing a resulting solid; and (c) heating the thus-sized solid powder in hydrogen.
Date:
March 26, 1981
Creator:
Hwai-der Liu, K. & Hamrin, C.E. Jr.
Object Type:
Patent
System:
The UNT Digital Library
Mathematical definition of protocol translation
This paper mathematically defines protocol translation which is a function employed to interconnect different computer networks. An example of an application is a gateway.
Date:
March 26, 1982
Creator:
Ong, M. M.
Object Type:
Article
System:
The UNT Digital Library
The DIII-D summary contribution to the final INTOR workshop
In SIII-D, good H-mode confinement has been obtained with up to 6 MW of neutral-beam injection (NBI). In this report we summarize the essential features of divertor operation for DIII-D H-mode plasma. Briefly, our measurements show that: Large edge density and temperarture gradients are obtained with scale lengths of a few cm at the midplane; In the steady state, approximately 10-20% of the input power is deposited on the divertor plates in a region that is peaked on the separatrix and extends radially over )approx equal) 2-4 cm at the outboard intercept. More power (2:1) reaches the outboard intercept than the inboard; Low electron temperature (less than or equal to20eV) and high density (n/sub e//sup div/ )approx equal) n/sub e//sup main/ greater than or equal to 3-10 )times)10/sup 19/ m/sup -3/ at the divertor plates indicate that DIII-D obtains a high-recycling divertor during H-mode. DEGAS neutral transport modeling is consistent with these results; The duration of good H-mode confinement is limited by Edge Localized Modes (ELMs) rather than increasing impurity radiation; The dominant impurities, C and Ni are concentrated in the edge plasma (ra greater than or equal to 0.5) for I/sub p/ greater than or equal to 1 MA; …
Date:
February 26, 1988
Creator:
Hill, D. N.; Allen, S. L.; Brooks, N. H.; Content, D.; DeBoo, J. C.; Gohil, P. et al.
Object Type:
Report
System:
The UNT Digital Library
Alternative theories of oil-inventory management and government policy options
Four alternative theories of oil inventory management and their implication for the level of private petroleum stockpiling are explored. The assumptions made were: that the product market for oil is competitive and that the capital market through which investments in oil stockpiles are financed is efficient. It is assumed that these conditions are expected to prevail even in the event of a supply interruption. These assumptions constitute the benchmark theory of oil inventory management. Variations on this theme provide the alternative theories of inventory behavior explored.
Date:
April 26, 1982
Creator:
Read, J.
Object Type:
Report
System:
The UNT Digital Library
Quarterly technical progress report No. 2, December 20-March 19, 1982. Second quarterly report on the effect of rapid heating rate on coal nitrogen and sulfur release
A laser pyrolysis technique is applied to the investigation of the effects of heating rate on release of coal-bound sulfur and nitrogen. An experimental system characterization and calibration has been completed. A detailed documentation was prepared describing the 3-color pyrometer and the data analysis technique. The coal particle feed system has been calibrated to provide accurate mass flow rate at pre-selected particle velocities. The first batch of samples submitted for chemical analysis will be used for the determination of kinetics parameters at a high heating rate (approximately equal to 10/sup 6/ K/s). The coal used presently is a Montana Rosebud. Two other coals are available; one is ILL No. 6 (through EERC) which will need to be pulverized and the second is a Pitt. hv-A (through KVB). It was confirmed that sieve and drag size distribution of coal differ significantly, and that particle shape effects may be significant in the modelling of particle dynamics.
Date:
April 26, 1982
Creator:
Gat, N.
Object Type:
Report
System:
The UNT Digital Library
Oklahoma's Residential High School: Cultivating Scholars
First page of an article on the creation of a special residential high school in Oklahoma, wherein Texas is mentioned as a state that has already done so.
Date:
October 26, 1987
Creator:
unknown
Object Type:
Article
System:
The UNT Digital Library
[Portion of Newspaper Article]
Portion of an article discussing the difficulties students at the Texas Academy of Mathematics and Science have in leaving their families at such a young age.
Date:
April 26, 1989
Creator:
Jamos, Cathy
Object Type:
Clipping
System:
The UNT Digital Library
TAMS closes first year with success
Article discussing the successes of the first class of Texas Academy of Mathematics and Science students, and th difficulties they had in adjusting to living away from home.
Date:
April 26, 1989
Creator:
Jamos, Cathy
Object Type:
Clipping
System:
The UNT Digital Library
Biomodal spontaneous fission
Investigations of mass and kinetic-energy distributions from spontaneous fission have been extended in recent years to an isotope of element 104 and, for half-lives, to an isotope of element 108. The results have been surprising in that spontaneous fission half-lives have turned out to be much longer than expected and mass and kinetic- energy distributions were found to abruptly shift away from those of the lighter actinides, showing two modes of fission. These new developments have caused a re-evaluation of our understanding of the fission process, bringing an even deeper appreciation of the role played by nuclear shell effects upon spontaneous fission properties. 16 refs., 10 figs.
Date:
September 26, 1989
Creator:
Hulet, E.K. (Lawrence Livermore National Lab., CA (USA))
Object Type:
Article
System:
The UNT Digital Library
Development of an operational multicomponent personnel neutron dosimeter/spectrometer DOSPEC
A multicomponent dosimeter has been developed that uses an albedo detector to provide the measurement of low energy neutrons and as a screening element. It also contains track detector components, CR-39 and polycarbonate, which are only processed if the TLD indicates there has been an exposure to neutrons. Since the three components have significantly different energy responses, the dosimeter can act as a crude spectrometer. This report describes the dosimeter and briefly summarizes its use experience. 10 refs., 2 figs., 2 tabs.
Date:
October 26, 1983
Creator:
Griffith, R.V. & McMahon, T.A.
Object Type:
Article
System:
The UNT Digital Library
Fabrication of a Set of Realistic Torso Phantoms for Calibration of Transuranic Nuclide Lung Counting Facilities
A set of 16 tissue equivalent torso phantoms has been fabricated for use by major laboratories involved in counting transuranic nuclides in the lung. These phantoms, which have bone equivalent plastic rib cages, duplicate the performance of the DOE Realistic Phantom set. The new phantoms (and their successors) provide the user laboratories with a highly realistic calibration tool. Moreover, use of these phantoms will allow participating laboratories to intercompare calibration information, both on formal and informal bases. 3 refs., 2 figs.
Date:
October 26, 1983
Creator:
Griffith, R. V.; Anderson, A. L.; Sundbeck, C. W. & Alderson, S. W.
Object Type:
Article
System:
The UNT Digital Library