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15,492 Matching Results
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D-Zero End Cap Calorimeter Inner Vessel Heater Documentation
There will be 48 finned strip heaters installed in each end cap calorimeter vessel. The strip heaters were specified and the lowest bid vendor submitted a sample heater which was tested. This engineering note will document specifications of the heater, test procedure used, and results of the test. The finned strip heaters were of stainless steel construction. The lowest bid was $45.00 per heater from TEMPCO Electric Heater Corporation. A sample heater from TEMPCO was inspected, cold shocked tested to -320 F, and found to be acceptable.
Date:
June 15, 1990
Creator:
Rucinski, R.
Object Type:
Report
System:
The UNT Digital Library
D-Zero Nitrogen Dewar Failure Mode and Effects Analysis and "What-If" Analysis
All components related to the nitrogen storage dewar were included. Pipe failures were excluded. Instrument air valves and components were excluded. See the 'What if' analysis for consequences from loss of instrument air.
Date:
December 5, 1990
Creator:
Rucisnki, R.A.
Object Type:
Report
System:
The UNT Digital Library
D-Zero Signal Board Feed-Thru, Instrumentation and Hi-Voltage Boxes
The three boxes being reviewed all operate at a pressure of less than 15 psig. Since they are relieved at 13 psig, they fall outside the scopes of the ASME Pressure Vessel Code, Fermilab Engineering Standard SD-37B, and Chapter 5031 of the Fermilab Safety Manual, therefore a Pressure Vessel Engineering Note showing compliance with SD-37B is not required. In calculating the design stresses, only the largest of the three boxes, the signal board feed-thru box, was analyzed. This box had the largest spans and areas and would experience the largest pressure-related forces. The thinnest walls of each box were found to be in the top plates and they were also the side of the box which exposed the largest amount of area to internal pressure. The signal board feed-thru box top plate had at least twice the pressure area than either the instrumentation or hi-voltage boxes' top plates. This large disparity overshadows the slight difference in top plate thicknesses between the three boxes (0.56-inch vs. 0.25-inch and 0.3125-inch, respectively). Therefore, we felt the analysis of the larger signal board feedthru box would justify the design of the smaller instrumentation and hi-voltage boxes. Appended to the end of this engineering note …
Date:
February 14, 1990
Creator:
Luther, R.
Object Type:
Report
System:
The UNT Digital Library
Zinc(II) oxide solubility and phase behavior in aqueous sodium phosphate solutions at elevated temperatures
A platinum-lined, flowing autoclave facility is used to investigate the solubility/phase behavior of zinc(II) oxide in aqueous sodium phosphate solutions at temperatures between 290 and 560 K. ZnO solubilities are observed to increase continuously with temperature and phosphate concentration. At higher phosphate concentrations, a solid phase transformation to NaZnPO{sub 4} is observed. NaZnPO{sub 4} solubilities are retrograde with temperature. The measured solubility behavior is examined via a Zn(II) ion hydrolysis/complexing model and thermodynamic functions for the hydrolysis/complexing reaction equilibria are obtained from a least-squares analysis of the data. The existence of two new zinc(II) ion complexes is reported for the first time: Zn(OH){sub 2}(HPO{sub 4}){sup 2{minus}} and Zn(OH){sub 3}(H{sub 2}PO{sub 4}){sup 2{minus}}. A summary of thermochemical properties for species in the systems ZnO-H{sub 2}O and ZnO-Na{sub 2}O-P{sub 2}O{sub 5}-H{sub 2}O is also provided. 21 refs., 10 figs., 7 tabs.
Date:
February 1, 1990
Creator:
Ziemniak, S. E.; Jones, M. E. & Combs, K. E. S.
Object Type:
Report
System:
The UNT Digital Library
Zinc substitution effects on the superconducting properties of Nd{sub 1.85}Ce{sub 0.15}CuO{sub 4-{delta}}
With the discovery of the electron superconductors, a new dimension was added to research in the field of high-temperature superconductivity. Studies of these materials should help elucidate the mechanism responsible for high-temperature superconductivity, as well as improve strategies for finding new superconductors. In this paper, we discuss the superconducting structural properties of Nd{sub 1.85}Ce{sub 0.15}(Cu{sub 1-y}Zn{sub y})O{sub 4} as a function of the Zn concentration y. Detailed comparisons with previous results of similar substitution studies in the single-CuO{sub 2}-layer hole superconductor La{sub 1.85}Sr{sub 0.15}CuO{sub 4} also are made. We have found that the non-magnetic element Zn has a detrimental effect on the T{prime}-phase electron superconductor, and that this effect is as strong as in the T-phase hole superconductor. Theoretical implications and the question of electron-hole symmetry are also discussed.
Date:
December 31, 1990
Creator:
Garcia-Vazquez, V.; Mazumdar, S.; Falco, C. M.; Barlingay, C. & Risbud, S. H.
Object Type:
Article
System:
The UNT Digital Library
Zinc substitution effects on the superconducting properties of Nd sub 1. 85 Ce sub 0. 15 CuO sub 4-. delta
With the discovery of the electron superconductors, a new dimension was added to research in the field of high-temperature superconductivity. Studies of these materials should help elucidate the mechanism responsible for high-temperature superconductivity, as well as improve strategies for finding new superconductors. In this paper, we discuss the superconducting structural properties of Nd{sub 1.85}Ce{sub 0.15}(Cu{sub 1-y}Zn{sub y})O{sub 4} as a function of the Zn concentration y. Detailed comparisons with previous results of similar substitution studies in the single-CuO{sub 2}-layer hole superconductor La{sub 1.85}Sr{sub 0.15}CuO{sub 4} also are made. We have found that the non-magnetic element Zn has a detrimental effect on the T{prime}-phase electron superconductor, and that this effect is as strong as in the T-phase hole superconductor. Theoretical implications and the question of electron-hole symmetry are also discussed.
Date:
January 1, 1990
Creator:
Garcia-Vazquez, Valentin; Mazumdar, S.; Falco, Charles M.; Barlingay, C. & Risbud, S. H.
Object Type:
Article
System:
The UNT Digital Library
Zircaloy cladding degradation under repository conditions
Creep, a potential degradation mechanism of Zircaloy cladding after repository disposal of spent nuclear fuel, has been investigated. The deformation and fracture map methodology has been used to predict maximum allowable initial storage temperatures to achieve a thousand year life without rupture as a function of spent-fuel history. Maximum allowable temperatures are 340{degree}C (613 K) for typically stressed rods (70--100 MPa) and 300{degree}C (573 K) for highly stressed rods (140--160 MPa). 10 refs., 2 figs.
Date:
December 1, 1990
Creator:
Santanam, L.; Raghavan, S.; Chin, B. A. & Shaw, H.
Object Type:
Article
System:
The UNT Digital Library
Zircaloy cladding performance under spent fuel disposal conditions; Progress report, May 1--October 31, 1989
The Brookhaven National Laboratory (BNL) Waste Materials and Environment Modeling (WMEM) Program has been assigned the task of helping the DOE formulate and certify analytical tools needed to support and/or strengthen the Waste Package Licensing Strategy. One objective of the WMEM program is to perform qualitative and quantitative analyses of irradiated Zircaloy cladding. This progress report presents the early findings of an on-going literature evaluation and the results of the numerical implementation of two models of Zircaloy creep. The report only addresses cladding degradation modes within intact, dry waste containers. Additional degradation modes will be considered when the study is expanded to include moist environments and partly failed containers. Further updates of the present analyses will also be provided.
Date:
April 1, 1990
Creator:
Pescatore, C.; Cowgill, M. G. & Sullivan, T. M.
Object Type:
Report
System:
The UNT Digital Library
Zonal statistics in (general circulation model) GCM/GCM/Data intercomparisons
Comparisons of general circulation model (GCM) results with each other and with climate data are routinely made on a variety of spatial scales. In bridging the gap from larger scale behavior (global, hemispheric) to the regional, zonal statistics are commonly used. Here, statistics are developed using values at all longitudinal gridpoints at a specified latitude and these are displayed as a function of latitude. The zonal average is the most routinely used of these statistics, but there are many other statistics available, few of which are ever examined. These provide a rich array of diagnostic measures for intercomparing models with each other and with observational data. Several of these measures are explored here: (1) histograms or boxplots displaying the detailed distributions, (2) rms or average absolute pointwise differences between model and data sets and (3) cross correlations and auto correlations. 5 figs.
Date:
November 1, 1990
Creator:
Grotch, S.L.
Object Type:
Article
System:
The UNT Digital Library
Zoning's Contribution to Residential Property Value
Technical report that describes how zoning may affect the prices of homes in College Station, Texas.
Date:
February 1990
Creator:
Harris, Jack C.
Object Type:
Report
System:
The Portal to Texas History
ZTI: An ignition class reversed-field pinch
A cost-optimized conceptual design of an intermediate-step, ignition-class RFP device (ZTI)for the study of alpha-particle physics and burn control in a DT plasma is reported. With major and minor plasma radii R{sub T} = 2.4m and {tau}{sub p} = 0.4m, respectively, and for conservative extrapolations of experimental energy-confinement times, ion-density profiles, and impurity levels, the ZTI operating conditions during a 5-s period of constant fusion power are: toroidal plasma current I{sub {phi}} {approx equal} 9 MA, plasma temperature T {approx equal} 11 keV, plasma density n{sub i} {approx equal} 3 {times} 10{sup 20} m{sup {minus}3}, fusion power P{sub F} {approx equal} 100 MW, and physics Q-value Q{sub p} {approx equal} 5 for a total machine size that corresponds to P{sub F}/M{sub FPC} {approx equal} 590 kW/tonne. This physics design point was adopted as a strawman'' with which to examine the requirements of ohmic heating to DT ignition and to perform a cost-optimized magnetics design. The ZTl design reflects potentially significant cost savings relative to similar ignition-class tokamaks for device parameters that reside on the path to a viable commercial RFP reactor. The methodology and results of coupling realistic physics, engineering, and cost models through a multi-dimensional optimizer are reported for …
Date:
January 1, 1990
Creator:
Bathke, C. G.; Krakowski, R. A.; Miller, R. L. & Werley, K. A.
Object Type:
Article
System:
The UNT Digital Library
ZTI: Preliminary characterization of an ignition class reversed-field pinch
A preliminary cost-optimized conceptual design of an intermediate-step, ignition-class RFP device (ZTI) for the study of alpha-particle physics in a DT plasma is reported. The ZTI design reflects potentially significant cost savings relative to similar ignition-class tokamaks for device parameters that reside on the path to a viable commercial RFP reactor. Reductions in both device costs and number of steps to commercialization portend a significantly reduced development cost for fusion. The methodology and result and coupling realistic physics, engineering, and cost models through a multi-dimensional optimizer are reported for ZTI, which is a device that would follow the 2--4 MA ZTH on a {approx gt} 1996--98 timescale. 15 refs., 7 figs., 2 tabs.
Date:
January 1, 1990
Creator:
Bathke, C. G.; Krakowski, R. A.; Miller, R. L. & Werley, K. A.
Object Type:
Article
System:
The UNT Digital Library