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Search Publications

NIST Authors in Bold

Displaying 24801 - 24825 of 73969

Sideband cooling of micromechanical motion to the quantum ground state

July 6, 2011
Author(s)
John Teufel, Tobias Donner, Dale Li, Michael S. Allman, Katarina Cicak, Adam Sirois, Jed D. Whittaker, Konrad Lehnert, Raymond Simmonds
The advent of laser cooling techniques revolutionized the study of many atomic-scale systems, fuelling progress towards quantum computing with trapped ions and generating new states of matter with Bose–Einstein condensates. Analogous cooling techniques can

Chapter 21 Calibration of Aerosol Instruments

July 5, 2011
Author(s)
Bean T. Chen, Robert A. Fletcher, Yung-Sung Cheng
This chapter reviews calibration techniques relevant to aerosol measurement devices, such as sizing instruments, condensation nuclei counters, and mass monitors. The generation methods for test aerosols and important parameters in instrument calibration

IMPACT OF CLASSICAL ASSUMPTIONS IN MODELLING A MICROCHANNEL GAS COOLER

July 5, 2011
Author(s)
Santiago Martinez-Ballester, Jose M. Corberan, Jose Gonzalvez-Macia, Piotr A. Domanski
Most of the current air-to-refrigerant heat exchanger models use the classic ε-NTU approach. These models do not account for 2D longitudinal heat conduction in the tube and the longitudinal heat conduction in the fin. These models, also do not account for

July 2011 SRM Spotlight

July 5, 2011
Author(s)
Regina R. Montgomery
The SRM Spotlight is a newsletter published by the Measurement Services Division for users of NIST standard reference materials. The Spotlight announces new reference materials and provides information about their use. In addition, this newsletter contains

Microscopy and Microanalysis of Individual Collected Particles- Chapter 10

July 5, 2011
Author(s)
Robert A. Fletcher, Nicholas W. Ritchie, Ian M. Anderson, John A. Small
This chapter describes microscopy and microanalysis techniques used for the characterization of collected, individual particles in a variety of instruments. The instruments discussed are the light microscope, electron microscopes (both scanning and

Using Cross-Evaluation to Evaluate Interactive QA Systems

July 5, 2011
Author(s)
Emile L. Morse, Ying Sun, Paul B. Kantor
Abstract: In this paper, we report on an experiment to assess the possibility of rigorous evaluation of interactive Question-Answering (QA) systems using the Cross-Evaluation method. This method takes into account the effects of tasks and context, and of

An Efficient Sensitivity Analysis Method for Large Cloud Simulations

July 4, 2011
Author(s)
Kevin L. Mills
We describe Koala, an infrastructure Cloud simulator inspired by the Amazon Elastic Compute Cloud (EC2). We conduct a sensitivity analysis of Koala, revealing eight behavioral dimensions, which are influenced significantly by six parameters. Our findings

Four-color laser white illuminant demonstrating high color-rendering quality

July 4, 2011
Author(s)
Alexander Neumann, Jonathan Wierer , Wendy L. Davis, Yoshi Ohno, Steve Brueck, Jeff Tsao
Solid-state lighting is currently based on light-emitting diodes (LEDs) and phosphors. Solid-state lighting based on lasers would offer significant advantages including high potential efficiencies at high current densities. Light emitted from lasers

Quantum superposition of a single microwave photon in two different colour states

July 3, 2011
Author(s)
Eva A. Zakka-Bajjani, Francois E. Nguyen, Minhyea Lee, Leila R. Vale, Raymond Simmonds, Joe Aumentado
The ability to manipulate photonic states is an important tool for quantum information processing. In cavity quantum electrodynamics (QED), coupling between bosonic modes has, until now, required a qubit to mediate the interaction. As an alternative, it is

A New Method for Evaluation of UNIFAC Interaction Parameters

July 1, 2011
Author(s)
Jeongwon Kang, Vladimir Diky, Robert D. Chirico, Joe W. Magee, Chris Muzny, Ilmutdin M. Abdulagatov, Andrei F. Kazakov, Michael D. Frenkel
A new method for obtaining UNIFAC group-group interaction parameters is proposed using evaluated thermophysical property data generated at the Thermodynamics Research Center (TRC) of the National Institute of Standards and Technology (NIST). Using the

Access Control for SAR Systems

July 1, 2011
Author(s)
Stephen Quirolgico, Chung Tong Hu, Tom T. Karygiannis
The Access Control for SAR Systems (ACSS) project focused on developing a prototype privilege management system used to express and enforce policies for controlling access to Suspicious Activity Report (SAR) data within the law enforcement domain. This

An Electromagnetic Evaluation of the NASA Space Power Facility at Plum Brook Station

July 1, 2011
Author(s)
Galen H. Koepke, John M. Ladbury, Dennis G. Camell, Jason B. Coder, Chriss A. Grosvenor, Randy Direen, Jeffrey R. Guerrieri
We describe in this report (Technical Note) an extensive electromagnetic evaluation of a unique test facility designed and built by the National Aeronautics and Space Administration (NASA). The Space Power Facility is presumed to be the world’s largest

Atomistic simulations for engineering: Potentials and challenges

July 1, 2011
Author(s)
Chandler A. Becker
Atomistic simulations, both electronic structure and non-quantum-mechanical methods such as molecular dynamics, are gaining in popularity and utility to treat a wide range of nanoscale phenomena and materials. These areas include catalysis, precipitation

Electrical Characterization of Photoconductive GaN Nanowire Devices from 50 MHz to 33 GHz

July 1, 2011
Author(s)
Thomas M. Wallis, Dazhen Gu, Atif A. Imtiaz, Pavel Kabos, Paul T. Blanchard, Norman A. Sanford, Kristine A. Bertness, Christpher Smith
The electrical response of two-port., photoconductive GaN nanowire devices was measured from 50 MHz to 33 GHz. The admittance of individual contacted nanowires showed an increase on the order of 10% throughout the measured frequency range after exposure to

Embedded Capacitive Displacement Sensor for Nanopositioning Applications

July 1, 2011
Author(s)
Svetlana Avramov-Zamurovic1, Nicholas Dagalakis, Rae Duk Lee, Jae M. Yoo, Seung H. Yang
The scale of nano objects requires very precise position determination. The state-of-the-art manipulators involve accurate nanometer positioning. The paper presents the design, fabrication process and testing of a capacitance based displacement sensor

Evaluating the characteristics of multiwall carbon nanotubes

July 1, 2011
Author(s)
John H. Lehman, M. Terrones, Elisabeth Mansfield, Katie Hurst, Vincent Muenier
During the past 20 years, multiwall carbon nanotubes (MWCNTs) have become an important industrial material. Hundreds of tons are produced each year. This review is a survey of the scientific literature, motivated by industrial requirements and guidelines

GaN nanowires grown by molecular beam epitaxy

July 1, 2011
Author(s)
Kristine A. Bertness, Norman A. Sanford, Albert Davydov
The unique properties of GaN nanowires grown by molecular beam epitaxy are reviewed. These properties include defect-free growth mode with no residual strain, long photoluminescence lifetime, low surface recombination velocity and high mechanical quality

Graphene: Materials to devices

July 1, 2011
Author(s)
Jungseok Chae, Jeonghoon Ha, H. Baek, Young Kuk, Suyong S. Jung, Young J. Song, Nikolai B. Zhitenev, Joseph A. Stroscio, S.J. Woo, Y.-W. Son
Displaying 24801 - 24825 of 73969
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