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22,237 Matching Results
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Zircaloy fuel cladding collapse test plan
This test plan outlines the experimental philosophy and procedures for investigating the deformation behavior of Zircaloy fuel cladding under normal and near-normal reactor operating conditions. Such conditions impose compressive hoop and axial stresses on the cladding at temperatures that encompass the time-dependent or creep-strain regime. The purpose of the outlined study is to understand the deformation behavior of cladding under in- and out-of-reactor conditions so that mechanical properties correlations may be developed.
Date:
August 1, 1976
Creator:
Hobson, D. O.
Object Type:
Report
System:
The UNT Digital Library
Zirconium and Niobium Transmission Data at Wavelengths from 11-16 nm and 200-1200 nm
Transmission measurements of niobium and zirconium at both extreme-ultraviolet (EUV) and ultraviolet, visible, and near infrared (UV/Vis/NIR) wavelengths are presented. Thin foils of various thicknesses mounted on nickel mesh substrates were measured, and these data were used to calculate the optical constants {delta} and {beta} of the complex refractive index n = 1- {delta} +i{beta}. {beta} values were calculated directly from the measured transmittance of the foils after normalizing for the nickel mesh. The average {beta} values for each set of foils are presented as a function of wavelength. The real (dispersive) part of the refractive index, {delta} was then calculated from Kramers-Kronig analysis by combining these {beta} values with those from previous experimental data and the atomic tables.
Date:
August 30, 2004
Creator:
Johnson, T; Soufli, R; Gulikson, E & Clift, M
Object Type:
Article
System:
The UNT Digital Library
Zirconium Fire and Explosion Hazard Evaluation. Interim Report
None
Date:
August 1, 1956
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Zirconium Hazards Research. Summary Report No. 3655 for September 1, 1956 to August 31, 1957
The sensitivity characteristics of a variety of Zr samples such as sponge, scrap, powder and process materials were studicd. Of particular interest was the determination of the relative seasitivity of these materials to such stimuli as impact, friction, electrostatic discharge, and heat. A study of the zirconium--water reaction at relatively low temperature was initiated. In general, scrap and sponge were relatively insensitive to impact. Only one proeess material, the distillation residue, exhibited any pyrophoric tendencies in this test. As anticipated, the majority of the samples tested were somewhat sensitive to friction. The dry distillation residues and Ca-reduced Zr powders, which had frequency rates of 100% in most cases, were the most sensitive of all the samples tested. Sponge was moderately sensitive, but the variation in sensitivity could not be correlated with either particle size or chemical impurities. Neither the Zr or Zircaloy scraps in the form of chips and turnings were very sensitive. The maierial which proved to be most insensitive to friction was the vapor phase residue. A frequency rate of zero was noted for all the samples tested. Using a condenser discharge to heat wire samples rapidly in aa inert atmosphere to a temperature well above the melting …
Date:
August 31, 1957
Creator:
Herickes, J.A.; Richardson, P.A.; Weiss, M. & Gelernter, G.
Object Type:
Report
System:
The UNT Digital Library
Zirconium Highlights
The effect of hot-worked thickness on the corrosion behavior of atmosphere-melted Zircaloy-2 is discussed. Hydrogen pickup upon etching Zircaloy- 2 Zircaloy-3, and properties of vacuum-cast Zircaloy-2 and the fabrication of special Zirccaloy shapes are presented. A hardness converison chart for annealed zirconium and zirconium alloys is included. (J.E.D.) The useful properties of the tungsten wires used in the incandescent lamp and ra dio tubes industry are ensured by adding about 1% of various ingredie (e.g., K, Na, Al, Si compounds) to the tungstic acid and producing metal powder and compressed rods. During the sintering of these rods, the additions are evapo rated to such an extact that finally the concentration of foreign atoms remains only 10/sup 5/. According to the investigations, the warm hardness values of these tungsten pieces is determined by the traces of impurities. In order to investigate the influencce of the various kinds of atoms, an apparatus was built for the determination of half-micro warm hardnesses of various kinds of tungsten metals in the temperature interval 20 to 800 deg C The tungsten wires made with additions containing Si had an average hardness H/sub V/ = 250 at 800 deg C, while the wires without such additions …
Date:
August 1, 1958
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Zone Refining of Plutonium Metal
The zone refining process was applied to Pu metal containing known amounts of impurities. Rod specimens of plutonium metal were melted into and contained in tantalum boats, each of which was passed horizontally through a three-turn, high-frequency coil in such a manner as to cause a narrow molten zone to pass through the Pu metal rod 10 times. The impurity elements Co, Cr, Fe, Ni, Np, U were found to move in the same direction as the molten zone as predicted by binary phase diagrams. The elements Al, Am, and Ga moved in the opposite direction of the molten zone as predicted by binary phase diagrams. As the impurity alloy was zone refined, {delta}-phase plutonium metal crystals were produced. The first few zone refining passes were more effective than each later pass because an oxide layer formed on the rod surface. There was no clear evidence of better impurity movement at the slower zone refining speed. Also, constant or variable coil power appeared to have no effect on impurity movement during a single run (10 passes). This experiment was the first step to developing a zone refining process for plutonium metal.
Date:
August 1, 1994
Creator:
Blau, M. S.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
A ZONED LOADING FOR A ZPR-III-TYPE FACILITY
None
Date:
August 1, 1964
Creator:
Edwards, A.G.
Object Type:
Report
System:
The UNT Digital Library
Zoning for Distributed Wind Power - Breaking Down Barriers: Preprint
Zoning regulations for the use of small wind turbines vary from state to state and from one local jurisdiction to the next. This paper examines the zoning experiences of small wind turbine owners, options for local actions, and examples of state and federal limited preemption of local zoning authority as a means of promoting the implementation of new technologies.
Date:
August 1, 2005
Creator:
Green, J. & Sagrillo, M.
Object Type:
Article
System:
The UNT Digital Library
Zooplankton data: Vertical distributions of zooplankton in the Norweigian and Greenland Seas during summer, 1989
Recent studies of zooplankton populations in the Greenland Sea have focused on processes at the Marginal Ice Zone (MIZ) and the areas immediately adjacent to it under the ice and in open water. These studies have shown a relatively short period of intense secondary productivity which is closely linked temporally and spatially to phytoplankton blooms occurring near the ice edge in spring and early summer. During the summer of 1989 we participated in a project focusing on benthic and water column processes in the basins of the Norwegian and Greenland Seas. This study allowed us to compare biological processes at the MIZ with those occurring in the open waters of the Greenland Sea, and to compare processes at both of these locations with those in the Norwegian Sea. The data presented in this report are the results of zooplankton net tows covering the upper 1000 meters of the water column over the Norwegian Sea basin and the Greenland Sea basin, and the upper 500 meters of open water adjacent to the MIZ in the Greenland Sea. Sampling was conducted between 12 and 29 July 1989.
Date:
August 1, 1993
Creator:
Lane, P. V. Z.; Smith, S. L. & Schwarting, E. M.
Object Type:
Report
System:
The UNT Digital Library
ZPPR progress report: April 1987-July 1987
This report describes the progress in the Jupiter-III program during the time period of April through July, 1987.
Date:
August 24, 1987
Creator:
Collins, P.J. & Brumbach, S.B.
Object Type:
Report
System:
The UNT Digital Library
ZT-40 administrative plan
An administrative plan for the ZT-40 project has been developed. It describes baselines and procedures that will be used for the remainder of the construction phase of the project.
Date:
August 1, 1978
Creator:
Thomas, K.S. (comp.)
Object Type:
Report
System:
The UNT Digital Library
ZX Pulsed-Power Design
ZX is a new z-pinch accelerator planned as the next generation z-pinch driver at SNL, and as an intermediate step towards X-1. It is planned to drive either a single 50 MA z-pinch load, or two 25 to 30 MA z pinches. Three designs for the ZX accelerator are presented. All require 7 to 8 MV at the insulator stack to drive the z-pinch load to implosion in 100 to 120 ns. Two of the designs are based on the Z accelerator, and use water-line technology; a transit-time-isolated water adder, and a water transformer. The third design uses inductive-voltage adders in water. They also describe a low-inductance insulator stack design that helps minimize voltage requirements. This design is evaluated for water and vacuum break-down using JCM, THM, and magnetic-flashover-inhibition criteria.
Date:
August 2, 1999
Creator:
Corley, J. P.; Johnson, D. L.; McDaniel, D. H.; Spielman, R. B.; Struve, K. W. & Stygar, W. A.
Object Type:
Article
System:
The UNT Digital Library
ZZ ---> l+ l- v anti-v production in p anti-p collisions at s**(1/2) = 1.96-TeV
None
Date:
August 1, 2008
Creator:
Abazov, V. M.; /Dubna, JINR; Abbott, B.; U., /Oklahoma; Abolins, M.; U., /Michigan State et al.
Object Type:
Article
System:
The UNT Digital Library