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NIST Authors in Bold

Displaying 26626 - 26650 of 73697

Molecular Mass Distribution Measurement by Mass Spectrometry

May 19, 2010
Author(s)
William E. Wallace, Charles M. Guttman
This NIST Recommended Practice Guide presents a method using mass spectrometry to make a quantitative determination of the molecular mass distribution of narrow polydispersity synthetic molecular materials. The main obstacle for converting an oligomer

Monitoring Photothermally Excited Nanoparticles via Multimodal Microscopy

May 19, 2010
Author(s)
Matthew L. Clarke, Shin G. Chou, Jeeseong Hwang
Generation of heat using optically excited nanoparticles can be beneficial or detrimental depending on the application. Therefore, clinically applicable studies are being pursued in an effort to achieve safe practices of nanoparticle-induced hyperthermia

Complex Systems Program Activities Summary, Fiscal Year 2009

May 18, 2010
Author(s)
Sanford P. Ressler
This report summarizes the work of the Complex Systems Program within NIST s Information Technology Laboratory. The Overview presents some background material and a high-level overview of the Program s activities including significant technical

Effect of strain, magnetic field and field angle on the critical current density of YBa 2 Cu 3 O 7-d coated conductors

May 18, 2010
Author(s)
Daniel C. van der Laan, J. F. Douglas, John (Jack) W. Ekin, Loren F. Goodrich, Theodore C. Stauffer, Cameron C. Clickner
A large, magnetic-field-dependent, reversible reduction in critical current density with axial strain in YBa 2Cu 3O 7-δ coated conductors at 75.9 K has been measured. This effect may have important implications for the performance of YBa 2Cu 3O 7-δ coated

Precision and Accuracy in Scientific Imaging

May 18, 2010
Author(s)
Russell A. Kirsch
Digital images are commonly used to represent scientific data. Typically, high resolution images with many square pixels are considered to be necessary under the assumption that the increased precision of such images yields increased accuracy to the viewer

Strength distribution of single-crystal silicon theta-like specimens

May 18, 2010
Author(s)
Michael S. Gaither, Frank W. DelRio, Richard S. Gates, Edwin R. Fuller, Robert F. Cook
A new test specimen has been developed for micro-scale tensile strength measurements, allowing direct assessment of surface effects on strength. Specimens were formed by deep reactive ion etching, tested with instrumented indentation, and test results

Anisotropic damping of the magnetization dynamics in Fe, Ni and Co

May 17, 2010
Author(s)
Daniel Steiauf, Jonas Seib, Manfred Faehnle, Keith Gilmore, Mark D. Stiles
The Gilbert parameter alpha describing the damping of magnetization dynamics is commonly taken to be an isotropic scalar. We argue that it is a tensor, that is anisotropic, leading to a dependence of the damping on both the instantaneous direction of the

Effect of Component Geometry on Flow Nonuniformities in a Large Pulse Tube Cryocooler

May 17, 2010
Author(s)
Michael A. Lewis, Ryan P. Taylor, Ray Radebaugh, Peter E. Bradley
A single-stage pulse tube cryocooler was designed to achieve 50 W of refrigeration power at 50 K when driven by a pressure oscillator that can produce up to 2.8 kW of acoustic power at 60 Hz. Initial experimental data produced no-load temperatures that

Fast Quantum Algorithms for Traversing Paths of Eigenstates

May 17, 2010
Author(s)
S. Boixo, Emanuel Knill, Rolando Somma
Consider a path of non-degenerate eigenstates |psi_s>, 0 Solutions to this problem have applications ranging from quantum physics simulation to optimization. For Hamiltonians, the conventional way of doing this is by applying the adiabatic theorem. We give

GRADED STRUCTURES FOR ALL-CERAMIC RESTORATIONS

May 17, 2010
Author(s)
Yu Zhang, H Chai, Brian R. Lawn
One failure mode of all-ceramic crown restorations is radial cracking at the cementation surface, from occlusally-induced flexure of the stiffer crown layer on the softer dentin underlayer. We hypothesize that such failure may be substantially mitigated by

INVESTIGATING WIND DRIVEN FIREBRAND PENETRATION INTO BUILDING VENTS

May 17, 2010
Author(s)
Samuel L. Manzello, Sayaka S. Suzuki, Yoshihiko Hayashi
Evidence suggests that wind driven firebrand showers are responsible for a majority of structure ignitions in Wildland-Urban Interface (WUI) fires in the USA and urban fires in Japan. This study is aimed at extensively quantifying firebrand penetration

Simultaneous XAFS Measurements of Multiple Samples

May 17, 2010
Author(s)
Bruce D. Ravel, C. Scorzato, D. P. Siddons, S. D. Kelly, S. R. Bare
A four-channel ionization chamber has been designed, constructed and tested. This ionization chamber allows X-ray absorption spectra to be collected in transmission from up to four samples simultaneously. This results in spectra that are free of systematic

Study of Proposed Internet Congestion-Control Mechanisms

May 17, 2010
Author(s)
Kevin L. Mills, James J. Filliben, Dong Y. Cho, Edward J. Schwartz, Daniel I. Genin
This study describes a coherent set of modeling and analysis methods to investigate the behavior of large distributed systems. The methods are applied to compare several proposed Internet congestion-control mechanisms operating under a wide range of

An Ultra-Stable Platform for the Study of Single-Atom Chains

May 16, 2010
Author(s)
Douglas T. Smith, Jon R. Pratt, Francesca M. Tavazza, Lyle E. Levine, Anne M. Chaka
We describe a surface probe instrument capable of sustaining single-atomic-bond junctions in the electronic quantum-conduction regime for tens of minutes, and present results for Au junctions that can be locked stably in n = 1 and n = 2 quantum conduction

Critical Constants of Organic Compounds

May 16, 2010
Author(s)
Chris D. Muzny, Vladimir Diky, Andrei F. Kazakov, Robert D. Chirico, Michael D. Frenkel
The parameters of the liquid-gas critical point are important constants in determining the behavior of fluids. This table lists the critical temperature, pressure, and molar volume, as well as the normal boiling point, for over 850 organic substances. The

Mid-IR frequency comb upconversion spectroscopy

May 16, 2010
Author(s)
Todd Johnson, Scott A. Diddams
We present a mid-infrared frequency comb generated via differency frequency mixing of a Yb femtosecond fiber laser. After passing through a methane gas sample, the MIR comb is upconverted and dispersed onto a CCD for detection.

Preserving quantum coherence using optimized open-loop control techniques

May 16, 2010
Author(s)
Michael J. Biercuk, Hermann Uys, Aaron Vandevender, Nobuyasu Shiga, Wayne M. Itano, John J. Bollinger
We describe experimental and theoretical studies of open-loop quantum control techniques known as dynamical decoupling (DD) for the suppression of decoherence-induced errors in quantum systems. Our experiments on trapped atomic ion qubits demonstrate that
Displaying 26626 - 26650 of 73697
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