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Displaying 22626 - 22650 of 74045

Thermal Issues in Machine Tools

October 19, 2012
Author(s)
Josef Mayr, Jerzy Jedrzejewski, Eckart Uhlmann, Alkan Donmez, Wolfgang Knapp, Frank H?rtig, Klaus Wendt, Paul Shore, Robert Schmitt, Christian Brecher, Timo W?rz, Konrad Wegener
This paper presents a review of the latest research activities and gives an overview of the state of the art in the field of thermal errors on machine tools. The topics are focused on metal cutting machine tools especially on turning and milling machines

Dynamics of the non-classical light from a single solid-state quantum emitter

October 18, 2012
Author(s)
Edward B. Flagg, Sergey Polyakov, Tim O. Thomay, Glenn S. Solomon
We measure the dynamics of a non-classical optical field using two-time second-order correlations in conjunction with pulsed excitation. The technique quantifies single-photon purity and coherence during the excitation-relaxation cycle of an emitter, which

Structural Response of World Trade Center Buildings 1, 2 and 7 to Impact and Fire Damage

October 18, 2012
Author(s)
Therese P. McAllister, John L. Gross, Fahim Sadek, Steven W. Kirkpatrick, Robert S. MacNeill, Mehdi S. Zarghamee, Omer O. Erbay, Andrew T. Sarawit
The National Institute of Standards and Technology (NIST) conducted an extensive investigation of the collapse of World Trade Center towers (WTC 1 and WTC 2) and the WTC 7 building. This paper describes the component, subsystem, and global analyses

Circuit Quantum Electrodynamics with a Spin-Orbit Qubit

October 17, 2012
Author(s)
Jacob M. Taylor, Karl Petersson, L. McFaul, M. Schroer, M. Jung, Andrew Houck, Jason Petta
We develop a circuit quantum electrodynamics architecture for spin qubits by coupling an InAs double quantum dot to a high quality factor superconducting cavity. A charge trapped in the double quantum dot interacts with the electric field of the cavity

Comparing Face Recognition Algorithms to Humans on Challenging Tasks

October 17, 2012
Author(s)
P J. Phillips, Alice O'Toole, Xiaobo An, Joseph Dunlop, Vaidehi Natu
We compared face identifcation by humans and machines using images taken under a variety of uncontrolled illumination conditions in both indoor and outdoor settings. Natural variations in a person's day-to-day appearance (e.g., hair style, facial

Effect of the Spherical Indenter Tip Assumption on the Initial Plastic Yield Stress

October 17, 2012
Author(s)
Li Ma, Lyle E. Levine, Ronald G. Dixson, Douglas T. Smith, David Bahr
Nanoindentation is widely used to explore the mechanical properties of small volumes of materials. For crystalline materials, there is a growing experimental and theoretical interest in pop-in events, which are sudden displacement-burst excursions during

Second Virial Coefficients of H2 and its Isotopologues from a Six-Dimensional Potential

October 17, 2012
Author(s)
Giovanni Garberoglio, Piotr Jankowski, Krzysztof Szalewicz, Allan H. Harvey
We employ path-integral Monte Carlo techniques to compute the second virial coefficient as a function of temperature for molecular hydrogen (H2), deuterium (D2), and tritium (T2), along with the mixed isotopologues HD, HT, and DT. The calculations utilize

Significance Test in Speaker Recognition Data Analysis with Data Dependency

October 17, 2012
Author(s)
Jin Chu Wu, Alvin F. Martin, Craig S. Greenberg, Raghu N. Kacker, Vincent M. Stanford
To evaluate the performance of speaker recognition systems, a detection cost function defined as a weighted sum of the probabilities of type I and type II errors is employed. The speaker datasets may have data dependency due to multiple uses of the same

Vacuum-Assisted Gas Atomization of Liquid Metal

October 17, 2012
Author(s)
Steven Mates, Stephen D. Ridder, Frank S. Biancaniello, Tony Zahrah
Vacuum-assisted gas atomization of liquid metal is explored. The investigation is motivated by observations of liquid metal atomization which indicate that secondary atomization is sustained over an extended distance from the nozzle tip. Increasing the

Efficient Algorithms for T-way Test Sequence Generation

October 16, 2012
Author(s)
Linbin Yu, Yu Lei, Raghu N. Kacker, D. Richard Kuhn, James F. Lawrence
Combinatorial testing has been shown to be a very effective testing strategy. Most work on combinatorial testing focuses on t-way test data generation, where each test is an unordered set of parameter values. In this paper, we study the problem of t-way

Notional Supply Chain Risk Management Practices for Federal Information Systems

October 16, 2012
Author(s)
Jon M. Boyens, Celia Paulsen, Nadya Bartol, Rama Moorthy, Stephanie Shankles
This publication is intended to provide a wide array of practices that, when implemented, will help mitigate supply chain risk to federal information systems. It seeks to equip federal departments and agencies with a notional set of repeatable and

Bi2Te3 and Bi2Te3-xSx FOR THERMOELECTRIC APPLICATIONS

October 15, 2012
Author(s)
Winnie K. Wong-Ng, N D. Lowhorn, Joshua B. Martin, Peter Zavalij, Howard Joress, Qingzhen Huang, Yonggao Y. Yan, Azzam Mansour, Evans L. Thomas, Jihui Yang, Martin L. Green
The increased interest in research and development on thermoelectric materials is partly due to the need for improved efficiency in the global utilization of energy resources. Historically, Bi2Te3 occupies an important position in the thermoelectric

Broadband Emissivity Calibration of Highly Reflective Samples at Cryogenic Temperatures

October 15, 2012
Author(s)
Solomon I. Woods, Timothy M. Jung, Greg Ly, Simon G. Kaplan, Jie Yu
We have developed a technique for calibrating the broadband optical emissivity of high reflectivity samples at cryogenic temperatures. This measurement method employs a primary standard optical detector with high absorptance from visible wavelengths to

Certification of NIST SRM 2569 Lead Paint Films for Children's Products

October 15, 2012
Author(s)
John L. Molloy, John R. Sieber, Karen E. Murphy, Stephen E. Long, Stefan D. Leigh
SRM 2569 Lead Paint Films for Children’s Products is a new Standard Reference Material (SRM) developed for use primarily with XRF instrumentation. It consists of three paint coatings, with nominally 0 mg/kg, 90 mg/kg, and 300 mg/kg of Pb added, on

Evaluation of Cation-Exchanged Zeolite Adsorbents for Post-Combustion Carbon Dioxide Capture

October 15, 2012
Author(s)
Tae-Hyun Bae, Matthew Ross Hudson, Jarad A. Mason, Wendy Queen, J.J. Dutton, Kenji Sumida, Ken J. Micklash, Steven S. Kaye, Craig Brown, Jeffrey R. Long
A series of zeolite adsorbents was evaluated for potential application in post-combustion (CO 2) capture. Among zeolites tested, Ca-A showed the highest CO 2 uptake together with an excellent CO 2 selectivity over N 2 at conditions relevant to capture from
Displaying 22626 - 22650 of 74045
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