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NIST Authors in Bold

Displaying 23951 - 23975 of 73727

Characterizing Dynamic Effects of Oscillator Power Cycling

November 14, 2011
Author(s)
David A. Howe, Danielle G. Lirette, Neil Ashby, Archita Hati, Craig W. Nelson
We create a measurement technique and metrics consistent with easy interpretation to be used in development of new oscillators specifically for applications in which the oscillator’s power is turned on and off. This is useful in predicting the performance

Fundamental Limits of Optical Patterned Defect Metrology

November 14, 2011
Author(s)
Richard M. Silver, Bryan Barnes, Martin Sohn, Hui Zhou, Jing Qin
The semiconductor manufacturing industry is now facing serious challenges in achieving defect detection rates with acceptable throughput and accuracy. With conventional bright-field and dark-field inspection methods now at their limits, it has become

Improvements to A Transportable Atomic Fountain Laser system

November 14, 2011
Author(s)
Paul D. Kunz, Vladislav Gerginov, Thomas P. Heavner, Steven R. Jefferts
We are developing a transportable rubidium (Rb) atomic fountain frequency standard which uses independently phase-locked diode lasers for laser-cooling. At this point in time, we have not demonstrated sub-Doppler (υKelvin) atom temperatures using out

Magneto-optical observation of four-wave scattering in a 15 nm Ni 81 Fe 19 film during large angle magnetization precession

November 14, 2011
Author(s)
Hans T. Nembach, Karen Livesey, Michael Kostylev, Patrica Martin-Pimentel, Sebastian Hermsdoerfer, Britta Leven, Juergen Fassbender, Burkard Hillebrands
Large angle magnetization precession induced by a short pulsed magnetic field in a 15 nm thick Ni 81Fe 19 film is observed using a time-resolved magneto-optical Kerr effect technique with sensitivity to all three components of the magnetization vector. A

Manipulating Particle Trajectories with Phase-control in Surface Acoustic Wave Microfluidics

November 14, 2011
Author(s)
Nathan D. Orloff, Jaclyn R. Dennis, Marco Cecchini, Ethan Schonbrun, Eduard Rocas, Yu Y. Wang, David R. Novotny, Raymond W. Simmonds, John M. Moreland, Ichiro Takeuchi, James C. Booth
We present a 91 MHz surface acoustic wave resonator with integrated microfluidics that includes a flow focus, an expansion region, and a binning region. We demonstrate the ability to change the position of the acoustic nodes by varying the electronics

New Improved System for WWVB Broadcast

November 14, 2011
Author(s)
John P. Lowe, Matthew J. Deutch, Glenn K. Nelson, Douglas D. Sutton, William C. Yates, Peder Hansen, Oren Eliezer, Tom Jung, Stephen Morrison, Yingsi Liang, Dinesh Rajan, Sidharth Balasubramanian, Arun Ramasami, Waleed Khalil
The WWVB broadcast of the time-code signal has not undergone major changes in its communications protocol and modulation scheme since its introduction in 1963. Its amplitude-modulation (AM) and pulse-width based representations of its digital symbols were

Synchronizing Computer Clocks by the Use of Kalman Filters

November 14, 2011
Author(s)
Judah Levine
The National Institute of Standards and Technology (NIST) currently operates 35 public network time servers that are located at many different sites in the United States. The servers provide time messages over the public Internet in a number of different

Impact Testing - Yesterday and Today

November 13, 2011
Author(s)
Enrico Lucon, Christopher N. McCowan
The Charpy impact test is a standardized high strain rate mechanical test which determines the amount of energy absorbed by a material during impact fracture. This test is widely applied in industry, since it is easy to prepare and conduct, and results can

Capacitive readout technique for studies of dissipation in GaN nanowire mechanical resonators

November 11, 2011
Author(s)
Kristine A. Bertness, Joshua R. Montague, Norman A. Sanford, Victor Bright, Charles T. Rogers
A variable-temperature, homodyne reflectometry measurement technique for detecting nanoscale mechanical motion has recently been developed. We have extended this technique to make the first all-electrical measurements of an ensemble of as-grown, c-axis

Characterization of (1-3,1-6)-b-D-Glucan Side Chain Structure Provides the Basis for a New Model of Fungal Cell Wall Rigidity and Flexibility

November 11, 2011
Author(s)
Daniel W. Bearden, Douglas W. Lowman, Lara J. West, Michael F. Wempe, Trevor D. Power, Harry E. Ensley, Ken Haynes, David L. Williams, Michael D. Kruppa
Glucan is a (1-3)-β-linked glucose polymer with (1-6)-β-linked side chains and a major component of fungal cell walls. Glucans provide structural integrity to the fungal cell wall. The nature of the (1-6)-β-linked side chain structure of fungal (1-3,1-6)-β

Quantum-based Voltage Waveform Synthesis

November 11, 2011
Author(s)
Samuel P. Benz
More than a decade of research and development was required to practically exploit the quantum behavior of superconducting Josephson junctions for ac applications. Sine waves and arbitrary waveforms had to be synthesized with sufficiently large voltage

In situ monitoring of enzyme-catalyzed (co)polymerizations by Raman spectroscopy

November 10, 2011
Author(s)
Matthew T. Hunley, Atul Bhangale, Santanu S. Kundu, Peter M. Johnson, Michael S. Waters, Richard Gross, Kathryn Beers
In situ, fiber optic-based Raman spectroscopy provided real time monitoring of enzyme-catalyzed ring-opening homo- and copolymerizations of ε-caprolactone (ε-CL) and δ-valerolactone (δ-VL). A custom designed reactor equipped with in situ fiber optic probe

Reliability Testing of Advanced Interconnect Materials

November 10, 2011
Author(s)
Robert R. Keller, Mark C. Strus, Ann C. Chiaramonti Debay, David T. Read, Younglae Kim, Yung J. Jung
We describe the development of electrical test methods to evaluate damage that determines reliability in advanced, small-scale conductors, including damascene copper and aligned carbon nanotube networks. Rapid thermal cycling induced during high-current AC

Uncertainties of Measures in Speaker Recognition Evaluation

November 10, 2011
Author(s)
Jin Chu Wu, Alvin F. Martin, Craig S. Greenberg, Raghu N. Kacker
The National Institute of Standards and Technology (NIST) Speaker Recognition Evaluations (SRE) are an ongoing series of projects conducted by NIST. In the NIST SRE, speaker detection performance is measured using a detection cost function, which is
Displaying 23951 - 23975 of 73727
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