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Zone plate imaging of 14-MeV neutrons

Description: At Livermore we are interested in imaging the thermonuclear burn region of fusion targets irradiated at our Nova laser facility. We expect compressed core diameters to be 10's of microns, and would like images with better than 10-..mu..m resolution. Alpha particle images provided the first direct information about the thermonuclear burn geometry in thin walled exploding pusher targets. In future high density target experiments, only highly penetrating radiations like the 14-MeV neutrons will es… more
Date: January 28, 1986
Creator: Lerche, R. A.; Lane, S. M.; Hawryluk, A. M. & Ceglio, N. M.
Item Type: Refine your search to only Article
open access

Zone Refining and Chemical Analysis of KCI and KBr Progress Report

Description: Upon initiation of our alkali halide purification program, we desired an accurate and complete chemical analysis of representative samples of the best salt commercially available. It was concluded that the most sensitive and probably most nearly complete technique is that provided by neutron activation.
Date: July 1959
Creator: Anderson, Scott; Wiley, John S. & Hendricks, Lloyd J.
Item Type: Refine your search to only Report
open access

Zone refining high-purity germanium

Description: The effects of various parameters on germanium purification by zone refining have been examined. These parameters include the germanium container and container coatings, ambient gas and other operating conditions. Four methods of refining are presented which reproducibly yield 3.5 kg germanium ingots from which high purity (vertical barN/sub A/ - N/sub D/vertical bar less than or equal to2 x 10/sup 10/ cm/sup -3/) single crystals can be grown. A qualitative model involving binary and ternary co… more
Date: October 1, 1977
Creator: Hubbard, G. S.; Haller, E. E. & Hansen, W. L.
Item Type: Refine your search to only Article
open access

Zone Refining of Plutonium Metal

Description: 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 elemen… more
Date: August 1, 1994
Creator: Blau, M. S.
Item Type: Refine your search to only Thesis or Dissertation
open access

Zone refining of plutonium metal

Description: The purpose of this study was to investigate zone refining techniques for the purification of plutonium metal. The redistribution of 10 impurity elements from zone melting was examined. Four tantalum boats were loaded with plutonium impurity alloy, placed in a vacuum furnace, heated to 700{degrees}C, and held at temperature for one hour. Ten passes were made with each boat. Metallographic and chemical analyses performed on the plutonium rods showed that, after 10 passes, moderate movement of ce… more
Date: May 1, 1997
Item Type: Refine your search to only Article
open access

Zone refining of sintered, microwave-derived YBCO superconductors

Description: Post-sintering treatments such as zone melting under thermal gradient has been conducted on sintered YBCO tape cast films. YBCO precursor powder was derived through decomposition of a mixture of nitrates of cations in a microwave oven for {approx}4 min. The resulting powder was characterized and made into thin sheets by tape casting and then sintered at 945 C for 5 h. The sintered tapes were subjected to repeated zone refining operations at relatively high speeds of {approx}30 mm/h. A microstru… more
Date: July 1993
Creator: Warrier, K. G. K.; Varma, H. K.; Mani, T. V.; Damodaran, A. D. & Balachandran, U.
Item Type: Refine your search to only Report
open access

Zone sintering of ceramic fuels

Description: Cold pressed UC{sup 2} fuel compacts are sintered at temperatures greater than about 1850 C while in contract with a sintering facilitator material, e.g., tantalum, niobium, tungsten or a metal carbide such as uranium carbide, thereby allowing for a reduction in the overall porosity and leaving the desired product, i.e., a highly dense, large-grained uranium dicarbide. The process of using the sintering facilitator materials can be applied in the preparation of other carbide materials.
Date: 1991
Creator: Matthews, R. Bruce; Chidester, Kenneth M. & Moore, H. Gene
Item Type: Refine your search to only Patent
open access

Zoning for Distributed Wind Power - Breaking Down Barriers: Preprint

Description: 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.
Item Type: Refine your search to only Article
open access

The ZOOM Fermilab physics class libraries

Description: Several years ago, the two major collider experiments at Fermilab (D#31; and CDF) decided that new software development for Run II will be largely done in C++. The run is slated to start in 1.5 years, an aggressive time frame for a major change in development language and style. If despite the transition each experiment (and sometimes multiple groups within an experiment) were to develop each needed mod- ule, the C++ strategy would not be advantageous. Thus it was deemed useful to have a librar… more
Date: November 1, 1998
Creator: Mark Fischler, Walter Brown, Philippe Canal and John Marraffino
Item Type: Refine your search to only Article
open access

The ZOOM minimization package

Description: A new object-oriented Minimization package is available for distribution in the same manner as CLHEP. This package, designed for use in HEP applications, has all the capabilities of Minuit, but is a re-write from scratch, adhering to modern C++ design principles. A primary goal of this package is extensibility in several directions, so that its capabilities can be kept fresh with as little maintenance effort as possible. This package is distinguished by the priority that was assigned to C++ des… more
Date: November 1, 2004
Creator: Fischler, Mark S. & Sachs, D.
Item Type: Refine your search to only Article
open access

A zoomable and adaptable hidden fine-mesh approach to solving advection-dispersion equations

Description: A zoomable and adaptable hidden fine-mesh approach (ZAHFMA), that can be used with either finite element or finite difference methods, is proposed to solve the advection-dispersion equation. The approach is based on automatic adaptation of zooming a hidden fine-mesh in the place where the sharp front locates. Preliminary results indicate that ZAHFMA used with finite element methods can handle the advection-dispersion problems with Peclet number ranging from 0 to infinity. 5 refs., 2 figs.
Date: January 1, 1988
Creator: Yeh, G.T.
Item Type: Refine your search to only Article
open access

A zooming Web browser

Description: We are developing a prototype zooming World-Wide Web browser within Pad++, a multiscale graphical environment. Instead of having a single page visible at a time, multiple pages and the links between them are depicted on a large zoomable information surface. Pages are scaled so that the page in focus is clearly readable with connected pages shown at smaller scales to provide context. We quantitatively compared performance with the Pad++ Web browser and Netscape in several different scenarios. We… more
Date: December 31, 1996
Creator: Bederson, Benjamin B.; Hollan, James D.; Stewart, Jason; Rogers, David; Vick, David; Ring, Laura et al.
Item Type: Refine your search to only Article
open access

Zooplankton data: Vertical distributions of zooplankton in the Norweigian and Greenland Seas during summer, 1989

Description: 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… more
Date: August 1993
Creator: Lane, P. V. Z.; Smith, S. L. & Schwarting, E. M.
Item Type: Refine your search to only Report
open access

Zooplankton from OTEC sites in the Gulf of Mexico and the Caribbean

Description: The spatial and temporal variations in the abundance of major classes of zooplankton were measured using standard methods, between June and October 1978, at two OTEC sites in the Gulf of Mexico and in the Caribbean near Puerto Rico. The usual oceanic patterns were found with highest numbers near the surface, especially at night, and lowest numbers at 800 to 1000 m. Absolute numbers varied considerably from site to site. As expected, copepods (usually divided between calanoids and cyclopoids) do… more
Date: June 1, 1979
Creator: Commins, M. L. & Horne, A. J.
Item Type: Refine your search to only Article
open access

ZORCH--AN IBM 7090 PROGRAM FOR THE ANALYSIS OF SIMULATED MSRE POWER TRANSIENTS WITH A SIMPLIFIED SPACE-DEPENDENT KINETICS MODEL

Description: A program (ZORCH) is described which is an extended and revised version of the point-model kinetics program MURGATROYD. A model is used in which the axial space dependence of the fuel and graphite temperatures is calculated, and the effect on reactivity of deviations from the steady state values is assumed to be given by the product of an appropriate temperature coefficient of reactivity times the deviations from the steady state value of the nuclear average temperature (NAT). The NAT is comput… more
Date: September 18, 1962
Creator: Nestor, C. W. Jr.
Item Type: Refine your search to only Report
open access

ZORNOC: a 1 1/2-D tokamak data analysis code for studying noncircular high beta plasmas

Description: A new tokamak data analysis code, ZORNOC, was developed to study noncircular, high beta plasmas in the Impurity Study Experiment (ISX-B). These plasmas exhibit significant flux surface shifts and elongation in both ohmically heated and beam-heated discharges. The MHD equilibrium flux surface geometry is determined by solving the Grad-Shafranov equation based on: (1) the shape of the outermost flux surface, deduced from the magnetic loop probes; (2) a pressure profile, deduced by means of Thomso… more
Date: March 1, 1980
Creator: Zurro, B.; Wieland, R. M.; Murakami, M. & Swain, D. W.
Item Type: Refine your search to only Report
open access

ZPPR-20 Phase D : A Cylindrical Assembly of Polyethylene Moderated U Metal Reflected by Beryllium Oxide and Polyethylene.

Description: The Zero Power Physics Reactor (ZPPR) fast critical facility was built at the Argonne National Laboratory-West (ANL-W) site in Idaho in 1969 to obtain neutron physics information necessary for the design of fast breeder reactors. The ZPPR-20D Benchmark Assembly was part of a series of cores built in Assembly 20 (References 1 through 3) of the ZPPR facility to provide data for developing a nuclear power source for space applications (SP-100). The assemblies were beryllium oxide reflected and had… more
Date: September 30, 2006
Creator: Lell, R.; Grimm, K.; McKnight, R.; Shaefer, R.; Division, Nuclear Engineering & INL
Item Type: Refine your search to only Report
open access

ZPPR progress report: August 1987-October 1987

Description: This progress report details activities during the time period of August through October, 1987. Results are presented from the axially heterogeneous assembly ZPPR-17, a part of the Jupiter-III program. The loading of the ZPPR-17B assembly, with 25 control rod positions, is described along with operational measurements, calculation models, measurements and predictions of criticality and measured axial worth profiles for B[sub 4]C. From ZPPR-17A, calculated and measured results are given for bank… more
Date: November 16, 1987
Creator: Brumbach, S.B. & Collins, P.J.
Item Type: Refine your search to only Report
open access

ZPPR progress report: February 1988 through April 1988

Description: Results are presented for control rod worth experiments in the axially heterogeneous assembly ZPPR-17, a part of the JUPITER-III program. From the earlier metal-fuel ZPPR-15 program, results are given for measurements and calculations of neutron spectra and sodium voiding in several configurations.
Date: May 13, 1988
Creator: Brumbach, S.B. & Collins, P.J.
Item Type: Refine your search to only Report
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