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Search Publications

NIST Authors in Bold

Displaying 22801 - 22825 of 73697

Improved performance of the ECCS experiment at PTB

July 1, 2012
Author(s)
Hansjoerg Scherer, Benedetta Camarota, Mark W. Keller, Sergey Lotkhov
Recent improvements on the ECCS experiment at PTB are reported. A 5-junction single-electron R-pump is shown to shuttle electrons with a relative transfer error of 5×10 -8. Moreover, the relative uncertainty of the setup for the cryogenic capacitor voltage

Method for Ensuring Accurate AC Waveforms with Programmable Josephson Voltage Standards

July 1, 2012
Author(s)
Charles J. Burroughs, Alain Rufenacht, Samuel P. Benz, Paul D. Dresselhaus
The amplitudes of stepwise-approximated sine waves produced by programmable Josephson voltage standards (PJVSs) are not intrinsically accurate because the transitions between the quantized voltages depend on numerous conditions. We have developed a method

Out-of-plane Stokes imaging polarimeter for early skin cancer diagnosis

July 1, 2012
Author(s)
P. Ghassemi, Paul Lemaillet, Thomas Germer, J. W. Shupp, S. Venna, M. E. Boisvert, K. E. Flanagan, M. H. Jordan, J. C. Ramella-Roman
Optimal treatment of skin cancer before it metastasizes depends critically on early diagnosis and treatment. Imaging spectroscopy and polarized remittance have been utilized in the past for diagnostic purposes, but valuable information can be also obtained

Proton Hopping and Long-Range Transport in the Protic Liquid [Im][TFSI], Probed by Pulsed-Field Gradient NMR and Quasi-Elastic Neutron Scattering

July 1, 2012
Author(s)
Megan L. Hoarfrost, Madhu Sudan Tyagi, Rachel A. Segalman, Jeffrey A. Reimer
Protic ionic liquids are promising candidates for a wide variety of electrochemical applications owing to their high proton conductivity, good thermal and electrochemical stability, and negligible volatility. Proton hopping leads to enhanced conductivity

Simple Test and Modeling of RFID Tag Backscatter

July 1, 2012
Author(s)
Daniel G. Kuester, David R. Novotny, Jeffrey R. Guerrieri, Aniwar Ibrahim, Zoya Popovic
We consider here worst-case analysis of backscatter from passive radio frequency identification (RFID) tags. The basis is a figure of merit "B" to relate link power at reader ports to tag circuit parameters. A minimum bound for received monostatic

Small-Angle Scattering from Branched Polymers

July 1, 2012
Author(s)
Boualem Hammouda
The single-polymer form factor is worked out for branched polynmers using a scaling argument in order to recover the low-Q Porod exponent characterisitc of the overall structure. The high-Q Porod exponent characterizes the local branching structure. An

SORCE SSI Workshop Summary

July 1, 2012
Author(s)
Joseph P. Rice, Jerald Harder, Martin Snow, Thomas Woods
Over 30 scientists and calibration specialists gathered at the National Institute of Standards and Technology (NIST) in Gaithersburg, Maryland, for the first Solar Spectral Irradiance (SSI) Variations Workshop, Feb. 28-March 1, 2012. The purpose of the

Standardizing Rectangular Metallic Waveguides for Terahertz Applications

July 1, 2012
Author(s)
Ronald A. Ginley, N M. Ridler
This paper describes an on-going activity to develop an international document standard for defining rectangular metallic waveguides for use in the submillimeter-wave/terahertz frequency range. The IEEE's Microwave Theory & Techniques Society (MTT-S) is

Testing Phasor Measurement Units Using IEEE 1588 Precision Time Protocol

July 1, 2012
Author(s)
Julien M. Amelot, Gerard Stenbakken
As the electric power grid is changing to a smarter more dynamically controlled system, there is increasing need for measurements that show the global status of the system for wide-area monitoring and control. These measurements require time

Testing Phasor Measurement Units using the IEEE 1588 Precision Time Protocol

July 1, 2012
Author(s)
Julien M. Amelot, Gerard N. Stenbakken
As the electric power grid is changing to a smarter more dynamically controlled system, there is increasing need for measurements that show the global status of the system for wide-area monitoring and control. These measurements require time

The Planck constant, watt and vacuum balances, and an evolving Mise en pratique for the kilogram in North America

July 1, 2012
Author(s)
Jon R. Pratt, David B. Newell, Zeina J. Kubarych, Stephan Schlamminger, Darine El Haddad, Ruimin Liu, Edwin R. Williams, Dave Inglis, Barry M. Wood, Carlos Sanchez, Richard Green
We report preparations underway at the National Institute of Standards and Technology (NIST) in the United States and at the National Research Council (NRC) in Canada to support the redefinition of the international system of units (SI) and the development

The role of probe shape on the initiation of metal plasticity in nanoindentation

July 1, 2012
Author(s)
Li Ma, Dylan Morris, Stefhanni Jennerjohn, David Bahr, Lyle E. Levine
The dislocation nucleation stress of crystalline materials is frequently estimated from the maximum shear stress assuming Hertzian contact up to the first “pop-in” event, which is a sudden displacement burst during load-controlled nanoindentation. However

UV-Assisted Alcohol Sensing with Zinc Oxide Functionalized Gallium Nitride Nanowires

July 1, 2012
Author(s)
Ritu Bajpai, Abhishek Motayed, Albert Davydov, Kristine A. Bertness, Mona E. Zaghloul
Alcohol sensors using gallium nitride (GaN) nanowires (NWs) functionalized with zinc oxide (ZnO) nanoparticles have been demonstrated. These sensors operate at room temperature, are completely recoverable and demonstrate a response and recovery time of the
Displaying 22801 - 22825 of 73697
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