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Displaying 401 - 425 of 2957

Distribution and Retention of 137 Cs in Sediments at the Hanford Site, Washington

September 1, 2001
Author(s)
J P. McKinley, Cynthia J. Zeissler, J M. Zachara, R J. Serne, Richard M. Lindstrom, H T. Schaef, R D. Orr
sium-137 and other contaminants have leaked from many of the single-shell storage tanks at the Hanford Site in southeastern Washington. The leakage was into sandy unconsolidated sediments consisting largely of quartz, plagioclase, micas, smectite, and

A Reference Equation of State for Heavy Water

December 3, 2018
Author(s)
Stefan Herrig, Monika Thol, Allan H. Harvey, Eric Lemmon
An empirical fundamental equation of state is presented for heavy water (deuterium oxide, D2O). The equation is explicit in the reduced Helmholtz energy and allows the calculation of all thermodynamic properties over the whole fluid surface. It is valid

Frequency Measurements of Al+ and Hg+ Optical Standards

June 8, 2009
Author(s)
Wayne M. Itano, James C. Bergquist, Till P. Rosenband, David J. Wineland, David Hume, Chin-wen Chou, Steven R. Jefferts, Thomas P. Heavner, Tom Parker, Scott Diddams, Tara Fortier
Frequency standards based on narrow optical transitions in 27Al+ and 199Hg+ ions have been developed at NIST. Both standards have absolute reproducibilities of a few parts in 10 17. This is about an order of magnitude better than the fractional uncertainty

Ratio of the Al + and Hg + Optical Clock Frequencies to 17 Decimal Places

August 25, 2008
Author(s)
Wayne M. Itano, Till P. Rosenband, David Hume, P.O. Schmidt, Chin-Wen Chou, A. Brusch, Luca Lorini, Windell Oskay, Robert E. Drullinger, Sarah Bickman, Tara M. Fortier, Jason Stalnaker, Scott A. Diddams, William C. Swann, Nathan R. Newbury, David J. Wineland, James C. Bergquist
Frequency standards (atomic clocks) based on narrow optical transitions in 27Al + and 199Hg + have been developed over the past several years at NIST. These two types of standards are both based on single ions confined in Paul traps, but differ in the

Spatial Uniformity and Resolution in Inkjet-Printed 241Am Phantoms Imaged by Digital Autoradiography

August 15, 2025
Author(s)
Sean Jollota, Denis Bergeron, Andrew Nupp, R Verkouteren, Svetlana Nour, Ryan Fitzgerald, Ohyun Kown, Jeffrey Radtke, Bryan Bednarz, Brian Miller, Larry DeWerd
… areal phantom patterns were printed onto stainless steel, nickel, and gold-coated nickel substrates. Imaging was performed at 10 μm² and 20 μm² … resolved printed features at 10 μm², and gold-coated nickel consistently exhibited the most confined and uniform …

A Progress Report on the NIST Convective Heat Flux Calibration Facility

March 15, 1999
Author(s)
David G. Holmberg, C A. Womeldorf
The National Institute of Standards and Technology has developed a convective heat flux calibration facility to allow evaluation of heat flux sensors. This facility is a small wind tunnel that produces a two-dimensional laminar boundary layer across a

Small Diameter Waveguide for Wideband Acoustic Emission

January 1, 2006
Author(s)
Marvin A. Hamstad
The signals obtained from two wideband conical sensors were compared in the time, frequency and the time/frequency domains. The signals were generated by pencil lead-breaks on the surface (out-of-plane) or close to the midplane of the edge (in-plane) of a

Fatigue Flaw NDE Reference Standard Development - Phase I Feasibility Study

November 1, 2012
Author(s)
Mark D. Richards, Joseph D. McColskey, Dash Weeks
A feasibility study was performed to evaluate a novel method of accurately fatigue cracking steel plates to generate fatigue proposed fatigue crack reference standards. Fatigue cracks were introduced into low carbon steel reference plates in which the
Displaying 401 - 425 of 2957
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