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506 Matching Results

Start Over Decade 1980-1989 Year 1989 Day 20th Language English

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Results: 1 - 24 of 506 next

(open access)

MHD compressor---expander conversion system integrated with GCR inside a deployable reflector

This work originates from the proposal MHD Compressor-Expander Conversion System Integrated with a GCR Inside a Deployable Reflector''. The proposal concerned an innovative concept of nuclear, closed-cycle MHD converter for power generation on space-based systems in the multi-megawatt range. The basic element of this converter is the Power Conversion Unit (PCU) consisting of a gas core reactor directly coupled to an MHD expansion channel. Integrated with the PCU, a deployable reflector provides reactivity control. The working fluid could be either uranium hexafluoride or a mixture of uranium hexafluoride and helium, added to enhance the heat transfer properties. The original Statement of Work, which concerned the whole conversion system, was subsequently redirected and focused on the basic mechanisms of neutronics, reactivity control, ionization and electrical conductivity in the PCU. Furthermore, the study was required to be inherently generic such that the study was required to be inherently generic such that the analysis an results can be applied to various nuclear reactor and/or MHD channel designs''.

Date: April 20, 1989

Creator: Tuninetti, G. (Ansaldo S.p.A., Genoa (Italy). Research Div.); Botta, E.; Criscuolo, C.; Riscossa, P. (Ansaldo S.p.A., Genoa (Italy). Nuclear Div.); Giammanco, F. (Pisa Univ. (Italy). Dipt. di Fisica) & Rosa-Clot, M. (Florence Univ. (Italy). Dipt. di Fisica)

Object Type: Report

System: The UNT Digital Library

(open access)

Cooling water for SSC experiments: Supplemental Conceptual Design Report (SCDR)

This paper discusses the following topics on cooling water design on the superconducting super collider; low conductivity water; industrial cooling water; chilled water systems; and radioactive water systems. (LSP)

Date: October 20, 1989

Creator: Doyle, R.E.

Object Type: Report

System: The UNT Digital Library

(open access)

The MTX (Microwave Tokamak Experiment) data acquisition system

The diagnostic data from the MTX experiment is acquired and processed by an expandable, distributed, multivendor computer network. The system blends a variety of software into a coordinated, unified, and highly flexible design. Using modular software design techniques, we created a system stressing distributed processing, portability, and transparent data access. In our approach to modularity, we standardized communication interfaces between modules and separated generic tasks from machine and application-specific implementations. For flexible distributed processing, we used modular, portable software and LLNL facility that provides an interprocess communication system (IPCS) in the multivendor network. With transparent data access, any program can access data stored anywhere in the network without knowing the specific location. The computer hardware includes a DEC VAX cluster, HP workstations and HP desktop computers. We are using commercial software in addition to packages from MIT, ORNL, and LLNL. 4 refs., 4 figs.

Date: September 20, 1989

Creator: Butner, D. N.; Drlik, M.; Brown, M. D.; Casper, T. A.; Meyer, W. H. & Moller, J. M.

Object Type: Article

System: The UNT Digital Library

(open access)

Plutonium Residue Recovery (PuRR) project quarterly progress report, April--June 1989

A material-balance flowsheet for ash-heel processing has been prepared. The major process features are (1) reduction of Pu into a calcium-zinc alloy and selective electrolytic recovery of the Pu from the alloy, (2) removal of americium as a waste, (3) concentration of nontransuranic tramp elements in a zinc waste, (4) removal of oxygen and recovery of calcium by electrolysis of CaO, and (5) zinc recycle by evaporation. Based on this idealized flowsheet, the mass of solid waste is only 62% of that of the original residue. This is accomplished by recycling virtually all the reagents and discarding the oxygen as CO and CO{sub 2}. The pyrochemical recovery of Pu from incinerator ash heel from the Rocky Flats Plant was investigated. During this period, zinc-calcium alloys were used to reduce the PuC{sub 2} in the ash. Reduction of ash heel has been attempted with zinc-calcium alloys containing 2, 6, and 10 wt% calcium after the reduction. These resulted in extractions of 95%, 97%, and 99.5%, respectively, of the Pu from the salt. Following exposure of the reduction alloy to a ZnCl{sub 2}-bearing salt, the Pu was removed effectively from the alloy; however, the Pu recovered in the salt did not complete …

Date: October 20, 1989

Creator: Gregg, D. W.; Hickman, R. G.; Landrum, J. H. (Lawrence Livermore National Lab., CA (USA)); Johnson, G. K.; Johnson, I.; Mulcahey, T. P. et al.

Object Type: Report

System: The UNT Digital Library

(open access)

Board OKs TAMS expansion

Article discussing the approved expansion of McConnell Hall, and the number of college and academy students who require campus housing.

Date: July 20, 1989

Creator: Hemby, Julie

Object Type: Clipping

System: The UNT Digital Library

(open access)

[Letter from Rogers Redding to Academic Deans and Department Chairs, February 20, 1989]

Letter from Rogers Redding to the deans and department chairs of the Texas Academy of Mathematics and Science, on February 20, 1989, announcing that Dr. Manus Donahue is the new associate director for academic programs for the Academy.

Date: February 20, 1989

Creator: Redding, Rogers W.

Object Type: Letter

System: The UNT Digital Library

(open access)

TAMS director leaves for Colorado academy

Newspaper article announcing that Texas Academy of Mathematics and Science director Rogers Redding is leaving the University of North Texas to take a one-year visiting faculty position at the U.S. Air Force Academy.

Date: January 20, 1989

Creator: Hueholt, Leslie

Object Type: Clipping

System: The UNT Digital Library

(open access)

Academy faces battle for 1989-90 funding

Newspaper article discussing the Texas Academy of Mathematics and Science's struggle to gain funding for the 1989-90 school year from the Texas Legislature.

Date: January 20, 1989

Creator: Lusk, Melinda

Object Type: Clipping

System: The UNT Digital Library

(open access)

Report from the polarization group of the Fermilab injector workshop

The group considered physics, accelerator, and polarized source issues. Most of the physics study was concerned with what significant and unique experiments could be done if polarized protons could be accelerated in the main injector and eventually in the Tevatron. 12 refs., 4 figs.

Date: July 20, 1989

Creator: Berger, E.; Glass, G.; Imai, K.; Jones, L.; Lin, A.M.T.; Mane, S.R. et al.

Object Type: Article

System: The UNT Digital Library

(open access)

Analysis of quench-vent pressures for present design of ITER (International Thermonuclear Experimental Reactor) TF (toroidal field) coils

The International Thermonuclear Experimental Reactor (ITER) is a new tokamak design project with joint participation from Japan, the European Community, the Union of the Soviet Union, and the United States. This paper examines the effects of a quench within the toroidal field (TF) coils based on current ITER design. It is a preliminary, rough analysis. Its intent is to assist ITER designers while more accurate computer codes are being developed and to provide a check against these more rigorous solutions. Rigorous solutions to the quench problem are very complex involving three- dimensional heat transfer, extreme changes in heat capacities and copper resistivity, and varying flow dynamics within the conductors. This analysis addresses all these factors in an approximate way. The result is much less accurate than a rigorous analysis. Results here could be in error as much as 30 to 40 percent. However, it is believed that this paper can still be very useful to the coil designer. Coil pressures and temperatures vs time into a quench are presented. Rate of helium vent, energy deposition in the coil, and depletion of magnetic stored energy are also presented. Peak pressures are high (about 43 MPa). This is due to the very …

Date: September 20, 1989

Creator: Slack, D.S.

Object Type: Article

System: The UNT Digital Library

(open access)

Recommendations for a cryogenic system for ITER (International Thermonuclear Experimental Reactor)

The International Thermonuclear Experimental Reactor (ITER) is a new tokamak design project with joint participation from Japan, the European Community, the Soviet Union, and the United States. ITER will be a large machine requiring up to 100 kW of refrigeration at 4.5 K to cool its superconducting magnets. Unlike earlier fusion experiments, the ITER cryogenic system must handle pulse loads constituting a large percentage of the total load. These come from neutron heating during a fusion burn and from ac losses during ramping of current in the PF (poloidal field) coils. This paper presents a conceptual design for a cryogenic system that meets ITER requirements. It describes a system with the following features: Only time-proven components are used. The system obtains a high efficiency without use of cold pumps or other developmental components. High reliability is achieved by paralleling compressors and expanders and by using adequate isolation valving. The problem of load fluctuations is solved by a simple load-leveling device. The cryogenic system can be housed in a separate building located at a considerable distance from the ITER core, if desired. The paper also summarizes physical plant size, cost estimates, and means of handling vented helium during magnet quench. 4 …

Date: September 20, 1989

Creator: Slack, D.S.

Object Type: Article

System: The UNT Digital Library

(open access)

Calculation of integrated luminosity for beams stored in the Tevatron collider

A model for calculating the integrated luminosity of beams stored in the Tevatron collider will be presented. The model determines the instantaneous luminosity by calculating the overlap integral of bunched beams passing through the interaction region. The calculation accounts for the variation in beam size due to the beta functions and also for effects due to finite longitudinal emittance and non-zero dispersion in the interaction region. The integrated luminosity is calculated for the beams as they evolve due to processes including collisions and intrabeam scattering. The model has been applied to both the extant and upgraded Tevatron collider, but is not limited to them. The original motivation for developing the computer model was to determine the reduction in luminosity due to beams with non-zero longitudinal emittances. There are two effects: the transverse beam size is increased where the dispersion is non-zero; the finite length of the beam bunch combined with an increasing /beta/ function results in an increased transverse beam size at the ends of the bunch. The derivation of a sufficiently useful analytic expression for the luminosity proved to be intractable. Instead, a numerical integration computer program was developed to calculate the luminosity in the presence of a finite …

Date: March 20, 1989

Creator: Finley, D.A.

Object Type: Report

System: The UNT Digital Library

(open access)

Program CICC flow and heat transfer in cable-in-conduit conductors

Computer program CICC has been written for use in the thermo-fluids design of superconducting magnets for tokamak reactors, which use forced-flow, helium-cooled, cable-in-conduit conductors (CICC). In addition to background heat loads that vary with space and time, these superconductors can develop normal zones that generate electrical resistance heat. Program CICC models the transient thermodynamic and fluid-dynamic system response to background heating and normal-zone propagation in the superconductor. The computational algorithm described in this paper couples a one-dimensional, compressible pipe-flow model (including flow choking) with two-dimensional, axisymmetric heat-conduction models of the superconductor cable, the conduit, and the epoxy-conduit insulation. National Institute of Standards and Technology helium properties are used. The model is verified by comparison with measured temperature and pressure profiles from thermal expulsion experiments. 10 refs., 9 figs.

Date: November 20, 1989

Creator: Wong, R.L. (Lawrence Livermore National Lab., CA (USA))

Object Type: Article

System: The UNT Digital Library

(open access)

Projections for a steady-state tokamak reactor based on ITER

The extensions of the physics and engineering guidelines for the ITER device needed for acceptable operating points for a steady-state tokamak power reactor are examined. Non-inductive current drive is provided in steady state by high-energy neutral-beam injection in the plasma core, lower-hybrid slow waves in the outer regions of the plasma and (30%) bootstrap current. Three different levels of extension of the ITER physics/engineering guide-lines, with differing assumptions on the possible plasma beta, elongation and aspect ratio, are considered for power-reactor applications. Plasma gain, Q/sub p/ = fusion power/input power, in excess of 20 and average neutron wall fluxes from 2.3 to 3.6 MW/m/sup 2/ are predicted in devices with major radii varying from 7.0 to 6.0 m and aspect ratios from 2.9 to 4. 3. Peak divertor heat fluxes range up to 12.2 MW/m/sup 2/ which is somewhat higher than the current ITER design limit of 10 MW/m/sup 2/ with a magnetically swept divertor. These designs were selected on the basis of improvements in physics/engineering consistent with time scales for development of future reactors. The design re-optimization on the basis of cost-of-electricity (COE) was then examined using a reactor systems model. This analysis generally verified the original estimates for …

Date: July 20, 1989

Creator: Devoto, R. S.; Barr, W. L.; Bulmer, R. H.; Campbell, R. B.; Fenstermacher, M. E.; Lee, J. D. et al.

Object Type: Report

System: The UNT Digital Library

(open access)

[Clipping: Academy students find place at college]

Article interviewing students at the Texas Academy of Mathematics and Science about their first semester living on the University of North Texas campus. Parts of ads are on the reverse of the article.

Date: January 20, 1989

Creator: Cobb, Dawn

Object Type: Clipping

System: The UNT Digital Library

captions transcript

[News Clip: AIDS Vigil]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, covering a news story about an outdoor AIDS vigil and interviews with people about the AIDS crisis and anger over the lack of state assistance.

Date: December 20, 1989

Creator: KXAS-TV (Television station : Fort Worth, Tex.)

Object Type: Video

System: The UNT Digital Library

captions transcript

[News Clip: Property Tax]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, covering a news story by reporter Jim Douglas about property taxes and efforts in Fort Worth and Tarrant County to remind and encourage citizens to pay their taxes in a timely manner. This story includes footage of women working at computers and an interview with Fort Worth tax supervisor Lynn Wright. This story aired at 6:00 P.M.

Date: January 20, 1989

Creator: KXAS-TV (Television station : Fort Worth, Tex.)

Object Type: Video

System: The UNT Digital Library

captions transcript

[News Clip: Earthquake]

B-roll video footage from the KXAS-TV/NBC station in Fort Worth, Texas, covering a news story about a performance event showing jazz and dance. This story aired at 10pm.

Date: November 20, 1989, 10:00 p.m.

Creator: KXAS-TV (Television station : Fort Worth, Tex.)

Object Type: Video

System: The UNT Digital Library

captions transcript

[News Clip: Costa]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, covering a news story by reporter Shelly Kofler about the changes of Soviet USSR, the opening of Germany borders, anti-soviet political protests, and Costa, a woman speaking about the political changes. This story aired at 10pm.

Date: November 20, 1989

Creator: KXAS-TV (Television station : Fort Worth, Tex.)

Object Type: Video

System: The UNT Digital Library

captions transcript

[News Clip: Dixico]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story. This story aired at 6pm.

Date: October 20, 1989

Creator: KXAS-TV (Television station : Fort Worth, Tex.)

Object Type: Video

System: The UNT Digital Library

captions transcript

[News Clip: Electrospace]

Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, covering a news story by reporter Larry Mullins about an interview with the president of the Electrospace company discussing the safety of his employees in Panama. This story aired at 6pm.

Date: December 20, 1989

Creator: KXAS-TV (Television station : Fort Worth, Tex.)

Object Type: Video

System: The UNT Digital Library