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Search Publications

NIST Authors in Bold

Displaying 20676 - 20700 of 73751

Unexpected effect of thermal storage observed on SiC power DMOSFET

September 29, 2013
Author(s)
Zakariae Chbili, Pragya R. Shrestha, Jason P. Campbell, John S. Suehle, Kin P. Cheung, D. E. Ioannou
In this paper we report an unexpected improvement in the SiC DMOSFET transistor characteristics after a long temperature treatment at 150 C. The evolution of the device characteristics during a TDDB stress is compared to that after an elevated temperature

Realization of high thermoelectric performance in p-type unfilled ternary skutterudites FeSb2+xTe1-x via band structure modification and significant electron-phonon scattering

September 28, 2013
Author(s)
Gangjian Tan, Xianli Su, Wei Liu, Hang Chi, Yonggao Yan, Xinfeng Tang, Ctirad Uher, Winnie Wong-Ng
FeSb2Te, a ternary system derived from binary CoSb3, displays anomalous electrical and thermal transport properties because of the considerable modification in band structure induced by Fe and the significant mixed valence states (namely Fe2+ and Fe3+)

Automated Control of National Time Standards via the SIM Time Scale

September 27, 2013
Author(s)
Michael A. Lombardi, J. Mauricio Lopez-Romero, Nelida Diaz-Munoz
This paper describes a frequency and time control system developed by the Sistema Interamericano de Metrologia (SIM). Due to limited resources, some SIM national metrology institutes maintain a low-cost rubidium clock as their national time standard

Influence of Exposure Conditions on the Efficiency of Internal Curing in Concrete

September 27, 2013
Author(s)
Michael Golias, Dale P. Bentz, Jason Weiss
Internal curing uses pre-wetted fine lightweight aggregate (LWA) to supply cementitious systems with water. This increases the hydration of cement and reduces the influence of self-desiccation resulting in concrete with increased compressive strength

INTER-BAN INTERFERENCE EVALUATION & MITIGATION: A PRELIMINARY STUDY

September 27, 2013
Author(s)
Kamran Sayrafian, Martina Barbi, Mehdi Alasti, Roberto Verdone
A Body Area Network (BAN) is a radio standard for wireless connectivity of wearable and implantable sensor nodes that are located inside or in proximity to the human body. Many applications of BANs (e.g. physiological monitoring) require reliable

SNoW: Understanding the Causes of Strong, Neutral, and Weak Face Impostor Pairs

September 27, 2013
Author(s)
P J. Phillips, Amanda Sgroi, Patrick J. Flynn, Kevin W. Bowyer
The Strong, Neutral, or Weak Face Impostor Pairs problem was generated to explore the causes and impact of impostor face pairs that span varying strengths of nonmatch. We develop three partitions within the impostor distribution of a given algorithm. The

Strong Casimir force reduction by metallic surface nanostructuring

September 27, 2013
Author(s)
Francesco Intravaia, Stefan T. Koev, Il Woong Jung, Albert A. Talin, Paul S. Davids, Ricardo Decca, Vladimir Aksyuk, Diego A. Dalvit, Daniel Lopez
The Casimir force is a quantum-mechanical interaction arising from vacuum fluctuations of the electromagnetic (EM) field and is technologically significant in micro- and nanomechanical systems. Despite rapid progress in nanophotonics, the goal of

Detection-Loophole-Free Test of Quantum Nonlocality, and Applications

September 26, 2013
Author(s)
B. G. Christensen, Kevin McCusker, Joseph Altepeter, Brice R. Calkins, Thomas Gerrits, Adriana Lita, Aaron J. Miller, Krister Shalm, Sae Woo Nam, P. G. Kwiat
We present a source of entangled photons that violates a Bell inequality free of the "fair-sampling" assumption, by over 50 standard deviations, and with enough "efficiency" overhead to eventually perform a fully loophole-free test of local realism. The

Determining Reference Test Weight per Bushel Value of Grains

September 26, 2013
Author(s)
Gloria D. Lee
Test weight per bushel is a measurement of the weight of a volume of grain required to fill level full a Winchester bushel measure of 2,150.42 cubic inches in capacity , which is equivalent to 32 quarts. Test weight per bushel is one of the measurements

Programmers Guide to the Air-Handling Unit Performance Assessment Rule DLL

September 26, 2013
Author(s)
Michael A. Galler
The AHU Performance Assessment Rules (APAR) were developed in 2001 and have been implemented as part of a limited number of Fault Detection and Diagnostics (FDD) tools. While a list of the rules has been widely available, an implementation of them that is

Structural Control of Magnetic Anisotropy in a Strain-Driven Multiferroic EuTiO 3 Thin Film

September 26, 2013
Author(s)
X. Ke, T. Birol, R. Misra, J.-H. Lee, Brian Kirby, D. G. Schlom, C.J. Fennie, J. W. Freeland
Octahedral distortion plays a key role in engineering physical properties of heterostructures of composed of perovskite oxides. We report on a strong in-plane uniaxial magnetic anisotropy in a strain-enabled multiferroic EuTiO 3 thin film epitaxially grown

10 TOhm and 100 TOhm High Resistance Measurements at NIST

September 25, 2013
Author(s)
Dean G. Jarrett, Marlin E. Kraft
The measurement techniques, standards, and bridges used to calibrate standard resistors in the 10 TΩ to 100TΩ range at NIST are described. Standard resistors, guarded Hamon transfer standard, and 10:1 and 100:1 bridge ratios, were used to provide multiple

Characterizing and Back-Porting Performance Improvement

September 25, 2013
Author(s)
Clif Flynt, Phil Brooks, Donald G. Porter
The Tcl interpreter is constantly being modified and improved. Improvements include new features and performance boosts. Everyone wants to use the latest releases with the newest improvements, but corporate users with large code bases may not be able to do

Co-Nonsolvency of Poly(n-isopropylacrylamide) in Deuterated Water/Ethanol Mixtures

September 25, 2013
Author(s)
Michael-Jon A Hore, Boualem Hammouda, Yuyan Li, He Cheng
Small-angle neutron scattering was used to investigate poly(N-isopropylacrylamide) (PNIPAM) polymer solutions in d-water /d-ethanol mixtures. A wide poor-solvent region was observed for mixtures near 60 % d-water/40 % d-ethanol mixture. Spinodal lines were

Rapid scan absorption spectroscopy using a waveform-driven electro-optic phase modulator in the 1.6- 1.65 ym region

September 25, 2013
Author(s)
Kevin O. Douglass, Stephen Maxwell, Gar W. Truong, Roger D. van Zee, Joseph T. Hodges, David Long, David F. Plusquellic
A method is reported for performing fast optical frequency scans over a bandwidth of 36.9 GHz and at a sweep rate of 40 kHz using a single second-order sideband from an electro-optic phase modulator driven by an arbitrary waveform generator. Single

The TREC Medical Records Track

September 25, 2013
Author(s)
Ellen M. Voorhees
The Text REtrieval Conference (TREC) is a series of annual workshops designed to build the infrastructure for large-scale evaluation of search systems and thus improve the state-of-the-art. Each workshop is organized around a set "tracks", challenge
Displaying 20676 - 20700 of 73751
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