Explanipedia

New apparatus for thermophysical measurements above 2500 K. [Enthalpy, volume, electric resistivity of solid and liquid; pressure dependence of melting point] Open

J. W. Shaner, G. R. Gathers, Camilla Minichino · 2011

An apparatus was developed to make simultaneous measurements of enthalpy, temperature, volume, and electrical resistivity on metals in the temperature range from 2500 to 8000/sup 0/K and at pressures up to 1 GPa. Cylindrical samples are re…

Determination of sound velocity in liquid metals at temperatures above 4000 K Open

G. R. Gathers, J. W. Shaner, C.A. Calder, Walter Wilcox · 2010

Present techniques for measuring sound velocity in liquid metals have been limited by transducers that cannot survive in extreme temperatures for the long periods these techniques require. We are developing an alternative, noncontacting te…

Thermophysical and transport properties of metals at high pressure and very high temperature Open

J W Shaner, G. R. Gathers · 2010

Simultaneous measurements of enthalpy, specific volume, temperature, and electrical resistivity for lead and uranium were measured. From the measured data, estimates of the bulk modulus and sound velocity in these metals are made. (GHT)

Analysis of multiwavelength pyrometry using nonlinear chi-square fits and Monte Carlo methods Open

G. R. Gathers · 1992

Error analysis by numerical simulation for a three-color pyrometer assuming a blackbody spectrum and a wavelength- and temperature-dependent emissivity Open

G. R. Gathers · 1992

Error analysis of a ratio pyrometer by numerical simulation Open

G. R. Gathers · 1992

HUGONIOT MEASUREMENTS ON A SLURRY OF FINELY DIVIDED TUNGSTEN AND PLASTIC Open

G. R. Gathers, H.H. Chau, J.E. Osher, R.C. Weingart · 1992

Hugoniot measurements with the LLNL electric gun facility Open

G. R. Gathers, H.H. Chau, J.E. Osher, R.C. Weingart · 1989

A wide class of materials exists with properties that are not consistent enough to justify making very accurate EOS measurements. Some are nonhomogeneous two-phase materials consisting of a matrix and an embedded material. In order to repr…

Capabilities and some applications of the LLNL 100-kV electric gun Open

J.E. Osher, G. R. Gathers, H.H. Chau, R.C. Weingart · 1989

The LLNL 100-kV electric gun is an experimental device for launching thin flyer plates at velocities as high as 20 km/s to study impact damage and shock-wave physics. The hypervelocity impact studies reported here include a damage study of…

Measurement of sound velocity in liquid metals Open

G. R. Gathers · 1979

Present techniques for measuring sound velocity in liquid metals have been limited by transducers that cannot survive in extreme temperatures for the long periods these techniques require. The report describes work on a dynamic noncontacti…

Thermodynamic characterization of liquid metals at high temperature by isobaric expansion measurements Open

G. R. Gathers, J. W. Shaner, William Mark Hodgson · 1978

Results of isobaric expansion measurements for platinum are presented, including simultaneous values for enthalpy, specific volume, temperature and electrical resistivity in tabular form as well as numerical fits up to 7500 K. The specific…

Thermophysical measurements on liquid metals above 4000 K Open

J. W. Shaner, G. R. Gathers, W.M. Hodgson · 1977

Thermophysical data are presented for liquid niobium up to approximately 6000/sup 0/K and for liquid lead up to approximately 5000/sup 0/K. These new results are summarized along with previously obtained high temperature data for liquid mo…

Shock compression parameters for a boron-loaded, silicone-rubber composite Open

W. Gust, M. van Thiel, G. R. Gathers · 1975

component. In the present work we describe a scintillator in which the boron is chemically bonded to the siloxane and so avoids the problem of precipitation and loss of boron to sublimation. Material containing up to 18% boron, by weight, …

High temperature carbon equation of state Open

G. R. Gathers, J. W. Shaner, David A. Young · 1974

REACTION HISTORY NOTES. Open

G. R. Gathers · 1971

of testing. This report documents the reconstitution of one vital diagnostic: the low bandwidth reaction history diagnostic for FY04. Reaction history is one of the major diagnostics that has been used on all LLNL and LANL tests since the …

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