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Search Publications

NIST Authors in Bold

Displaying 18051 - 18075 of 73697

Is Your Replication Device Making An Extra Copy For Someone Else?

April 16, 2015
Author(s)
Celia Paulsen, Larry Feldman, Gregory A. Witte
This bulletin summarizes the information presented in NISTIR 8023, Risk Management for Replication Devices, written by Celia Paulsen and Kelley Dempsey. The publication provides guidance on protecting the confidentiality, integrity, and availability of

D90: The strongest contributor to setting time in MTA and Portland Cement

April 15, 2015
Author(s)
William Ha, Dale P. Bentz, Wyatt Kahler, Laurence Walsh
Introduction: The setting times of commercial mineral trioxide aggregate (MTA) and Portland cements vary. It was hypothesized that much of this variation was due to differences in particle size distribution. Methods: Two gram samples from 11 MTA-type

InChI, the IUPAC International Chemical Identifier

April 15, 2015
Author(s)
Stephen R. Heller, Alan McNaught, Igor Pletnev, Stephen Stein, Dmitrii Tchekhovskoi
This paper documents the design, layout and algorithms of the IUPAC International Chemical Identifier, InChI.

Micro-Flow Calibration Facility at NIST

April 15, 2015
Author(s)
James W. Schmidt, John D. Wright
The Fluid Metrology Group (FMG) at NIST is developing a primary, dynamic gravimetric liquid flow standard for use in the range 1 mL/min to 100 nL/min (and eventually lower). An elevated reservoir of water with a pressure head of a few centimeters provides

Quantitative Imaging of Clinker and Cement Microstructure

April 15, 2015
Author(s)
Paul E. Stutzman, Jeffrey W. Bullard, Pan Feng
The combination of scanning electron microscopy (SEM) with X-ray microanalysis and image processing provides a powerful ability to image and quantify microstructural features of con- struction materials. This document provides guidance for collecting

Template-Polymer Commensurability and Directed Self-Assembly Block Copolymer Lithography

April 15, 2015
Author(s)
Daniel F. Sunday, Regis J. Kline, Elizabeth Ashley, Lei Wan, Kaniyal Patel, Ricardo Ruiz
The directed self assembly (DSA) of block copolymers (BCP’s) is being explored for lithographic patterning of features between 5 nm and 50 nm. The chemoepitaxial approach towards DSA utilizes a chemical template to promote long range ordering of the BCP

Biexciton formation and exciton coherent coupling in layered GaSe

April 14, 2015
Author(s)
Prasenjit Dey, Jagannath Paul, Galan Moody, Christopher Stevens, Neil Glikin, Zakhar Kovalyuk, Zakhar Kudrynskyi, Aldo Romero, Andres Cantarero, David Hilton
Nonlinear two-dimensional Fourier transform (2DFT) and linear absorption spectra of layered GaSe exhibit two peaks at the direct 1s exciton energy. The doublet is assigned to a splitting of the excitonic ground state into the singlet and triplet. The 2DFT

Biological Evidence Preservation: Considerations for Policy Makers

April 14, 2015
Author(s)
Shannan R. Williams, Melissa Taylor, Susan M. Ballou, Mark D. Stolorow, Margaret C. Kline, Phylis S. Bamberger, Larry Brown, Rebecca Brown, Burney Yvette, Davenport Dennis, Lindsay DePalma, Ted Hunt, Cynthia E. Jones, Ralph Keaton, William Kiley, Joseph Latta, Karen Thiessen, Gerry LaPorte, Linda E. Ledray, Randy Nagy, Brian Ostrom, Linda Schwind, Stephanie Stoiloff
Biological Evidence Preservation: Considerations for Policy Makers is a policy brief intended to provide guidance to legislators, advocates, and managers within criminal justice agencies that influence policy. The content in this document is informed by an

How Large Can We Go? Isolation of > 1 nm Diameter Single-Wall Carbon Nanotubes Species using Aqueous Two Phase Extraction

April 14, 2015
Author(s)
Jeffrey A. Fagan, Erik Haroz, Rachelle Ihly, Hui Gui, Jeffrey Blackburn, Jeffrey R. Simpson, Stephen K. Doorn, Stephanie Lam, Angela R. Hight Walker, Ming Zheng
We demonstrate the effective separation of near-monochiral single-wall carbon nanotube (SWCNT) species with diameters > 1 nm through multi-stage aqueous two phase extraction (ATPE), and report an empirical function for the surfactant concentrations at

Nanoscale Spin Valve Josephson Junction Devices

April 14, 2015
Author(s)
Burm Baek, William H. Rippard, Matthew R. Pufall, Samuel P. Benz, Stephen E. Russek, Horst Rogalla, Paul D. Dresselhaus
Traditionally, superconductivity and magnetism have had a mutually exclusive relationship. However, the physics of superconductor-ferromagnet hybrid structures turned out to be far from being simply destructive, which has led to the hope of a new breed of

Pass / Fail / Inconclusive Criteria for Inter-Laboratory Comparisons

April 14, 2015
Author(s)
Blaza Toman, Bodo Mickan, Gerd Wubbeler, Olha Bodnar, Clemens Elster, John D. Wright
Inter-laboratory comparisons use the best available transfer standards to check participants uncertainty analyses, identify underestimated uncertainty claims or measurement errors, and improve the global measurement system. For some measurands (e.g. flow)

Privacy Amplification in the Isolated Qubits Model

April 14, 2015
Author(s)
Yi-Kai Liu
Isolated qubits are a special class of quantum devices, which can be used to implement tamper-resistant cryptographic hardware such as one-time memories (OTM's). Unfortunately, these OTM constructions leak some information, and standard methods for privacy

Scatterfield Microscopy and the Fundamental Limits of Optical Defect Metrology

April 14, 2015
Author(s)
Richard M. Silver, Bryan M. Barnes, Martin Y. Sohn, Hui Zhou
Defect inspection remains a critical manufacturing challenge due to the competing requirements between throughput and very high resolution. Currently only optical methods provide an acceptable solution, although there are a number of process layers and

The Art in Science of MicroTAS: the 2014 issue

April 14, 2015
Author(s)
Darwin R. Reyes-Hernandez
For the 7th year in a row the Art in Science award competition, sponsored by Lab on a Chip and the National Institute of Standards and Technology (NIST), took place at the 18th International Conference of Miniaturized Systems for Chemistry and Life

Thermal Effects on Critical Flow Venturis

April 14, 2015
Author(s)
John D. Wright, Aaron N. Johnson, Michael R. Moldover, Woong Kang, Liang Zhang
Critical flow venturis (CFVs) are widely used as working and transfer standards for gas flow measurement because of their long-term calibration stability (5 (e.g., a 2 mm throat diameter flowing air at 1 MPa), CFVs exhibit sensitivity to the environmental
Displaying 18051 - 18075 of 73697
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