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Search Publications

NIST Authors in Bold

Displaying 22601 - 22625 of 74220

Broad bandwidth trace gas and standoff detection with infrared frequency comb sources

March 11, 2012
Author(s)
Nathan R. Newbury, Alexander M. Zolot, Esther Baumann, Fabrizio R. Giorgetta, Florian B. Adler, Ian R. Coddington, Kevin O. Knabe, Lora L. Nugent-Glandorf, Paul A. Williams, Scott A. Diddams, Tyler W. Neely
An optical frequency comb based on the output of a mode-locked femtosecond laser can be used in spectroscopic studies and sensing applications. The broad array of frequency modes simultaneously provides high spectral resolution and broad wavelength

The National Ballistics Imaging Comparison (NBIC) Project

March 10, 2012
Author(s)
Jun-Feng Song, Theodore V. Vorburger, Susan M. Ballou, Robert M. Thompson, James H. Yen, Thomas Brian Renegar, Xiaoyu Alan Zheng, Richard M. Silver, Martin Ols
In response to the guidelines issued by the ASCLD/LAB-International (American Society of Crime Laboratory Directors/Laboratory Accreditation Board) to establish traceability and quality assurance in U.S. crime laboratories, a NIST/ATF joint project

Traceable Calibration of a Critical Dimension Atomic Force Microscope

March 9, 2012
Author(s)
Ronald G. Dixson, Ndubuisi G. Orji, Craig D. McGray, John E. Bonevich, Jon C. Geist
The National Institute of Standards and Technology (NIST) has a multifaceted program in atomic force microscope (AFM) dimensional metrology. One component of this program, and the focus of this paper, is the use of critical dimension atomic force

An Evaluation of Local Shape Descriptors for 3D Shape Retrieval

March 8, 2012
Author(s)
Sarah Y. Tang
As the usage of 3D models increases, so does the importance of developing accurate 3D shape retrieval algorithms. Most prominently, shape descriptors are used to describe the geometric and topological properties of objects and compared to determine two

Graphing and Grafting Graphene: Classifying Finite Topological Defects

March 8, 2012
Author(s)
Eric J. Cockayne
The structure of finite-area topological defects in graphene is described in terms of both the direct honeycomb lattice and its dual triangular lattice. Such defects are equivalent to cutting out a patch of graphene and replacing it with a different patch

An Analysis of Solver-Based Simulation Tools

March 7, 2012
Author(s)
Ion Matei, Conrad E. Bock
Computer-interpretable representations of systems’ structure and behavior are at the center of designing today’s complex systems. Engineers create and review such representations using (graphical) modeling languages that support specification, analysis

Friedel-like Oscillations from Interstitial Iron in Superconducting Fe 1+y Te 0.62 Se 0.38

March 7, 2012
Author(s)
V. Thampy, J. Kang, Jose Rodriguez Rivera, W. Bao, A. T. Savici, J. Hu, T. J. Liu, B. Qian, D. Fobes, Z. Q. Mao, C. B. Fu, Wangchun Chen, Q. Ye, Ross Erwin, Thomas R. Gentile, Z. Tesanovic, Collin L. Broholm
Using polarized and unpolarized neutron scattering we show that interstital Fe in superconducting Fe 1=yTe 1-xSe x induces a magnetic Friedel-like oscillation that idffracts at Q = (1⁄20) and involves greater than}50 neighboring Fe sites. The interstitial

Optical microscope angular illumination analysis

March 7, 2012
Author(s)
Ravikiran Attota
For high precision applications of optical microscopes, it is critical to achieve symmetrical angular illumination intensity at the sample plane, in addition to uniform spatial intensity achieved by Köhler illumination. In this paper, first we demonstrate

Demonstration of on-sky calibration of astronomical spectra using a 20 GHz near-IR laser frequency comb

March 6, 2012
Author(s)
Gabriel G. Ycas, Franklyn J. Quinlan, Scott A. Diddams, Steve Osterman, Chad F. Bender, Brandon Botzer, Lawrence W. Ramsey, Ryan Terrien, Suvrath Mahadevan, Stephen L. Redman
We describe and characterize a 25 GHz laser frequency comb based on a cavity-filtered erbium fiber mode-locked laser that provides a uniform array of optical frequencies stabilized using the GPS-system atomic clocks spanning 1475–1625 nm. This comb was

High Speed Endurance and Switching Measurements for Memristive Switches

March 6, 2012
Author(s)
Pragya R. Shrestha, Adaku Ochia, Kin P. Cheung, Jason P. Campbell, Helmut Baumgart, Gary Harris
Accurate capture of the Set/Reset characteristics is a necessary but challenging task for the development of memristive switches. Here we describe and demonstrate a technique capable of meeting this challenge. This technique can measure the transient

Results of an international comparison for the activity measurement of 177Lu

March 6, 2012
Author(s)
Brian E. Zimmerman, Denis E. Bergeron, Jeffrey T. Cessna
An international Key Comparison of 177Lu has recently been carried out. Twelve laboratories performed assays for radioactivity content on aliquots of a common master solution of 177Lu, leading to eleven results submitted for entry into the Key Comparison

The Biological Macromolecule Crystallization Database

March 6, 2012
Author(s)
David Travis Gallagher, Michael Tung
The Biological Macromolecule Crystallization Database (BMCD) is described. The database currently contains 14372 entries with crystallization information for proteins, protein–protein complexes, nucleic acids, nucleic acid–nucleic acid complexes, protein

Tunnel FET Heterojunction Band Alignment by Internal Photoemission Spectroscopy

March 6, 2012
Author(s)
Qin Zhang, Guangle Zhou, Huili G. Xing, Alan C. Seabaugh, Kun Xu, Sio Hong, Oleg A. Kirillov, Curt A. Richter, Nhan Van Nguyen
The electron energy band alignment of a metal-oxide-semiconductor tunnel field-effect transistor (TFET) heterojunction, W/Al2O3/InGaAs/InAs/InP is determined by internal photoemission spectroscopy. At the oxide flat-band condition, the barrier height from

Hydrogen Species Motion in Piezoelectrics: A Quasi-Elastic Neutron Scattering Study

March 5, 2012
Author(s)
K. J. Alvine, Madhu Sudan Tyagi, Craig Brown, Terrence J. Udovic, T. Jenkins, S. G. Pitman
Hydrogen is known to damage or degrade piezoelectric materials, at low pressure for ferroelectric random access memory applications, and at high pressure for hydrogen powered vehicle applications. The piezoelectric degradation is in part governed by the
Displaying 22601 - 22625 of 74220