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Search Publications

NIST Authors in Bold

Displaying 20301 - 20325 of 73960

Compressed-liquid Density Measurements of Three Alternative Turbine Fuels

February 7, 2014
Author(s)
Stephanie L. Outcalt
Compressed-liquid densities of three alternative turbine fuels have been measured. The measurements were made from 270 K to 470 K, and 0.5 MPa to 50 MPa. The data have been correlated with a Tait equation, and parameters are given for each fuel. Results of

Graphene-on-dielectric micromembrane for optoelectromechanical hybrid devices

February 7, 2014
Author(s)
Jacob M. Taylor, Silvan Schmid, Tolga Bagci, Emil Zeuthen, Patrick Herring, Maja Cassidy, C. M. Marcus, Bartolo Amato, Anja Boisen, Yong C. Shin, Jing Kong, Anders Sorensen, Koji Usami, E.S. Polzik
Due to their exceptional mechanical and optical properties, dielectric silicon nitride (SiN) mi- cromembranes have become the centerpiece of many optomechanical experiments. Efficient capac- itive coupling of the membrane to an electrical system would

High-accuracy measurement of the black-body radiation frequency shift of the ground-state hyperfine transition in 133 Cs

February 7, 2014
Author(s)
Steven R. Jefferts, Thomas P. Heavner, Thomas E. Parker, Jon H. Shirley, Elizabeth A. Donley, Neil Ashby
We report a high-accuracy direct measurement of the blackbody radiation shift (BBR) of 133Cs ground state hyperfine transition. This frequency shift is one of the largest systematic frequency biases encountered in realizing the current definition of the SI

Maximum-likelihood fits to histograms for improved parameter estimation

February 7, 2014
Author(s)
Joseph W. Fowler
Straightforward methods for adapting the familiar χ 2 statistic to histograms of discrete events and other Poisson distributed data generally yield biased estimates of the parameters of a model. The bias can be important even when the total number of

Designing High-Performance PbS and PbSe Nanocrystal Electronic Devices through Stepwise, Post-Synthesis, Colloidal Atomic Layer Deposition

February 6, 2014
Author(s)
Soong Ju Oh, Nathaniel E. Berry, Hi-Hyuk Choi, E. A. Gaulding, Hangfei Lin, Taejong Paik, Benjamin T. Diroll, Shinichiro Muramoto, Murray B. Christopher, Cherie R. Kagan
We report a facile, solution based, post synthetic colloidal atomic layer deposition (PS-cALD) process to engineer the surface stoichiometry and therefore electronic properties of lead chalcogenide nanocrystal (NC) thin films. Using the stepwise and

International Comparison of a Hydrocarbon Gas Standard at the Picomol per Mol Level

February 6, 2014
Author(s)
George C. Rhoderick, David L. Duewer, Eric Apel, Annarita Baldan, Bradley Hall, Alice Harling, Detlev Helmig, Gwi S. Heo, Jacques Hueber, Mi E. Kim, Yong D. Kim, Benjamin Miller, Stephen Montzka, Daniel Reimer
Studies of climate change increasingly recognize the diverse influences of hydrocarbons in the atmosphere, including roles in particulates and ozone formation. Measurements of key non methane hydrocarbons (NMHCs) suggest atmospheric mole fractions ranging

CPTAC Studies 1 and 5: dissecting variability in multi-site LC-MS/MS proteomics through quality metrics and robust hierarchical multivariate statistics

February 4, 2014
Author(s)
Stephen E. Stein, David M. Bunk, Xia Wang, Matthew Chambers, Lorenzo J. Vega-Montoto, David L. Tabb
Shotgun proteomics experiments integrate a complex sequence of processes, any of which can introduce variability. Quality metrics computed from LC-MS/MS data have relied upon identifying MS/MS scans, but a new mode for the QuaMeter software produces

Order by Disorder Spin Wave Gap in the XY Pyrochlore Magnet Er 2 Ti 2 O 7

February 4, 2014
Author(s)
Kathryn Aileen Ross, Yiming Qiu, John R. Copley, H. A. Dabkowska, B. D. Gaulin
The recent determination of a robust spin Hamiltonian for the anti-ferromagnetic XY pyrochlore Er 2Ti 2O 7 reveals a most convincing case of the ¿order by quantum disorder¿ (ObQD) mechanism for ground state selection. This mechanism relies on quantum

Report: Authentication Diary Study

February 4, 2014
Author(s)
Michelle P. Steves, Mary F. Theofanos
Users have developed various coping strategies for minimizing or avoiding the friction and burden associated with managing and using their portfolios of user IDs and passwords or personal identification numbers (PINs). Many try to use the same password (or

Third-order antibunching from an imperfect single-photon source

February 4, 2014
Author(s)
Martin J. Stevens, Scott C. Glancy, Sae Woo Nam, Richard P. Mirin
We measure second- and third-order temporal coherences, g(2)(τ) and g(3)(τ1,τ2), of an optically excited single-photon source: an InGaAs quantum dot in a microcavity pedestal. Increasing the optical excitation power leads to an increase in the measured

Third-order antibunching from an imperfect single-photon source

February 4, 2014
Author(s)
Martin J. Stevens, Scott C. Glancy, Sae Woo Nam, Richard P. Mirin
We measure second- and third-order temporal coherences, g (2)(τ) and g (3)(τ1, τ2), of an optically excited single-photon source: an InGaAs quantum dot in a microcavity pedestal. Increasing the optical excitation power leads to an increase in the measured

A four-pixel single-photon pulse-position array fabricated from WSi superconducting nanowire single- photon detectors

February 3, 2014
Author(s)
Varun B. Verma, Robert D. Horansky, Francesco Marsili, Jeffrey Stern, Matthew Shaw, Adriana E. Lita, Richard P. Mirin, Sae Woo Nam
We demonstrate a scalable readout scheme for an infrared single-photon pulse-position camera consisting of WSi superconducting nanowire single-photon detectors. For an N × N array, only 2 × N wires are required to obtain the position of a detection event

Documentation for Reference Material (RM) 8820: A Versatile, Multipurpose Dimensional Metrology Calibration Standard for Scanned Particle Beam, Scanned Probe and Optical Microscopy

February 3, 2014
Author(s)
Michael T. Postek, Andras Vladar, Bin Ming, Bunday Benjamin
Reference Material (RM) 8820 is a multipurpose instrument calibration standard available from NIST. This is a dimensional standard initially developed to replace the out of stock RM 8090 used for X and Y scale calibrations of scanned particle beam

Estimation of uncertainty in application profiles

February 3, 2014
Author(s)
David W. Flater
Application profiling tools are the instruments used to measure software performance at the function and application levels. The most powerful measurement method available in application profiling tools today is sampling-based profiling, where a

Frequency Measurement

February 3, 2014
Author(s)
Michael A. Lombardi
An overview of frequency metrology, with emphasis on estimating accuracy and stability, oscillator types, and measurement instrumentation. It describes how to measure frequency and the statistics and terminology that are used to report the results. The

Head and Media Challenges for 3 Tb/in 2 Microwave Assisted Magnetic Recording

February 3, 2014
Author(s)
Thomas J. Silva, Justin M. Shaw, Hans T. Nembach, Mike Mallary, Kumar Srinivasan, Gerado Bertero, Dan Wolf, Christian Kaiser, Michael Chaplin, Mahendra Pakala, Leng Qunwen, Yiming Wang, Carl Elliot, Lui Francis
A specific design for Microwave Assisted Magnetic Recording (MAMR) at about 3Tb/in 2 (0.47 Tb/cm 2 or 4.7 Pb/m 2) is discussed in detail to highlight the challenges of MAMR and to contrast its requirements with conventional Perpendicular Magnetic Recording

IT Risks

February 3, 2014
Author(s)
Linda Wilbanks, D. Richard Kuhn, Wes Chou
Risk management is a common phrase when managing information, from the CISO to the programmer. We acknowledge that risk management is the identification, assessment and prioritization of risks and reflects how we manage uncertainty. These are some areas of
Displaying 20301 - 20325 of 73960
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