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Search Publications

NIST Authors in Bold

Displaying 1101 - 1125 of 2915

Extension and new level optimization of the Ne IV spectrum

January 13, 2012
Author(s)
Alexander Kramida, C M. Brown, Uri Feldman, Joseph Reader
Spectra of Ne emitted by a Penning discharge were recorded in the extreme ultraviolet (EUV) region between 140 Å and 359 Å on a 10.7 m grazing-incidence spectrograph with phosphor storage image plates. These spectra provided 33 newly identified lines of Ne

An interferometric platform for studying AFM probe deflection

January 3, 2011
Author(s)
Jon R. Pratt, Lee Kumanchik, Tony L. Schmitz
This paper describes an interferometric platform for measuring the full-field deflection of atomic force microscope (AFM) probes and generic cantilevers during quasi-static loading. The platform consists of a scanning white light interferometer (SWLI)

REFLECTIVITY STUDIES OF PASSIVE MICROWAVE CALIBRATION TARGETS AND ABSORPTIVE MATERIALS

July 30, 2010
Author(s)
Dazhen Gu, Amanda Cox, Derek A. Houtz, Dave K. Walker, James P. Randa, Robert L. Billinger
We report the characterization of blackbody reflections as a part of the recent progress on the development of brightness standards for microwave remote sensing at National Institute of Standards and Technology (NIST).Three blackbody targets at variable

Non-Contact Temperature Measurements of Micro-Scale Phenomena

October 16, 2008
Author(s)
Howard W. Yoon
Imaging trying to make temprature measurements in a spatial region equal to the edge of a printer paper or within the diameter of a strand of hair. The accurate computer modeling of the machining process requires measurements of the thermodynamic

Neutron Images of the Through-Plane Water Distribution of an Operating PEM Fuel Cell

July 27, 2007
Author(s)
Daniel S. Hussey, David L. Jacobson, Muhammad Arif, Jon P. Owejan, Jeffrey J. Gagliardo, T Trabold
Neutron imaging has proven an invaluable tool for water metrology in operating proton exchange membrane fuel cells. Due to limitations in scintillator-based detector resolution, neutron imaging has been applied only to assessing the in-plane water

Residual stress determination by diffraction: Modeling and applications

January 1, 2004
Author(s)
Davor Balzar, N C. Popa
Residual stress plays an important role in shaping Iilaterials properties. We present both the method to determine texture-weighted strain orientation distribution function for arbitrary crystal and sample symmetries and an example of the determination of

Metallurgical Analysis of Wrought Iron From the RMS Titanic

April 1, 2003
Author(s)
J J. Hooper, Timothy J. Foecke, L Graham, Timothy P. Weihs
The discovery of the RMS Titanic has led to a number of scientific studies, one of which addresses the role that structural materials played in the sinking of the ship. Early studies focused on the quality of the hull steel as a contributing role to the

Wall Migration and Shear-Induced Diffusion of Fluid Droplets in Emulsions

January 1, 2003
Author(s)
Steven D. Hudson
The spatial distribution of drops in multiphase flow through narrow passages is analyzed theoretically and experimentally. In simple shear between two plates, drops migrate away from the walls and concentrate towards the center of the gap. At steady state

Acoustic Study of Texture in Polycrystalline Brass

May 1, 1999
Author(s)
K Foster, S L. Fairburn, R G. Leisure, Sudook A. Kim, Davor Balzar, G A. Alers, H M. Ledbetter
Resonant ultrasonic spectroscopy was used to measure the orthorhombic elastic constants of rolled, polycrystalline plates of Cu, Cu - 5% Zn, and Cu - 15% Zn. The experimental results were in good agreement with theory for the Cu and the Cu-15% Zn materials

Characterizing the thermal effects of High Energy Arc Faults

November 30, 2015
Author(s)
Anthony D. Putorti Jr., Nicholas Melly, Scott Bareham, Joseph E. Praydis
International and domestic operating experience involving High Energy Arc Faults (HEAF) in Nuclear Power Plant (NPP) electrical power systems have demonstrated the potential to cause extensive damage to electrical components and distribution systems along

Optical Microwave Frequency Stability: Some Constraints

July 25, 2005
Author(s)
Leo W. Hollberg, Scott A. Diddams, A Bartels, John J. McFerran, Eugene N. Ivanov, G Wilpers, Christopher W. Oates
Optical frequency references achieve the best frequency stability of any oscillators by taking advantage of high Q = υ 0/{Δ}υ optical resonances. These systems are beginning to run into fundamental and technical limitations which are discussed.

4-bar-quasi-phasematching for second-harmonic generation in microdisks

August 15, 2011
Author(s)
Paulina S. Kuo, Glenn S. Solomon
We present a theoretical description of resonantly enhanced, 4-bar-quasi-phasematched, second-harmonic generation in microdisks made of materials possessing 4-bar symmetry, such as GaAs, GaP and ZnSe. The theory describes the interplay between quasi

2 Combinatorial Methods Polymer Science: Synthesis and Characterization

November 1, 2001
Author(s)
J C. Meredith, A P. Smith, Alamgir Karim, Eric J. Amis
Combinatorial methodologies offer the ability to efficiently measure relevant chemical and physical properties over lare regimes of varible space. We review recent work in the development of combinatorial methods for polymer synthesis and characterization

Persistent photoconductivity studies of c-axis GaN nanowires grown by MBE

September 16, 2007
Author(s)
Norman Sanford, Paul T. Blanchard, Kristine A. Bertness, Alexana Roshko, Beau Burton, Lorelle Mansfield, John B. Schlager, Steven George, Aric Sanders
Photoconductivity (PC) and persistent photoconductivity (PPC) were measured on c-axis GaN nanowires (NWs) grown by catalyst-free nitrogen plasma assisted MBE on Si(111) substrates. Unintentionally doped n-type NWs from two separate growth batches were
Displaying 1101 - 1125 of 2915
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