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Displaying 18351 - 18375 of 74024

The Nature of Record Efficiency Fluid-Processed Nanotube-Silicon Heterojunctions

April 20, 2015
Author(s)
Jeffrey A. Fagan, Erik K. Hobbie, John M. Harris, Matthew R. Semler
The dark transport characteristics of heterojunctions assembled from type, chirality and length-purified single-wall carbon nanotubes (SWCNTs) are used to clarify the nature of nanotube-silicon diodes and solar cells. The freestanding films show remarkable

Using cytochrome P4501A1 expression in liver and blubber to understand effects of persistent organic pollutant exposure in stranded Pacific Island cetaceans

April 18, 2015
Author(s)
Melannie J. Bachman, Jennifer M. Lynch, Kerry Foltz, Kristi West, Brenda Jensen
Elevated levels of persistent organic pollutants (POPs) have been reported in tropical Pacific Island cetaceans and their environment. In addition, recent health concerns in cetacean populations have warranted investigation into potential physiological

Design and Capabilities of NISTs Scale-Model Smokestack Simulator (SMSS)

April 17, 2015
Author(s)
Aaron N. Johnson, Joey T. Boyd, Eric Harman, Mohammad M. Khalil, Jacob E. Ricker, Christopher J. Crowley, Rodney A. Bryant, Iosif I. Shinder
The amount of CO 2 emitted from a coal-fired power plant (CFPP) is measured by continuous emissions monitoring systems (CEMS) permanently installed in the exhaust smokestack. Both the CO 2 concentration and the bulk flow are continuously measured by CEMS

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
Displaying 18351 - 18375 of 74024
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