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Displaying 25401 - 25425 of 73878

Rate Constants for the Reactions between OH and Perfluorinated Alkenes

February 20, 2011
Author(s)
Vladimir L. Orkin, Gregory A. Poskrebyshev, Michael J. Kurylo III
The rate constants for the reactions of OH radicals with fully fluorinated alkenes containing different number of –CF3 groups next to olefinic carbon, CF2=CF2, CF2=CFCF3, CF3CF=CFCF3, (CF3)2C=CFC2F5 were measured using the flash photolysis resonance

New Research in Nanotechnology - Nanotechnology Science and Technology Series

February 19, 2011
Author(s)
Michael T. Postek, Joseph J. Kopanski, David A. Wollman
NIST is developing a broad range of nanometrology (measurements) and nanomanufacturing techniques necessary for the successful commercialization of nanotechnology. This book is a compilation of a number of selected NIST accomplishments in nanotechnology

Characterization of Approach Air Distribution for a Finned-Tube Heat Exchanger

February 18, 2011
Author(s)
David A. Yashar, Piotr A. Domanski, Hong H. Cho
The distribution of air flow approaching a finned-tube heat exchanger is one of the predominant factors influencing the heat exchanger’s performance. This paper describes a method for measuring and predicting the inlet air flow distribution using Particle

SRM Spotlight

February 18, 2011
Author(s)
Regina R. Montgomery
The SRM Spotlight is a newsletter published by the Measurement Services Division for users of NIST standard reference materials. The Spotlight announces new reference materials and provides information about their use. In addition, this newsletter contains

Tetrathienoanthracene-based Copolymers for Efficient Solar Cells

February 18, 2011
Author(s)
Feng He, Wei Wang, Wei Chen, Tao Xu, Seth B. Darling, Joseph Strzalka, Yun Liu, Luping Yu
A series of semiconducting copolymers (PTAT-x) containing extended π-conjugated tetrathienoanthracene units have been synthesized. It was shown that the extended conjugation system enhanced the π-π stacking in the polymer/ PC 61BM blend films and

A Direct Analysis Method for Drift-Sensitive Steel Moment Frames

February 17, 2011
Author(s)
John L. Harris
Design interaction equations for steel members in a moment frame are formulated based on inelastic member capacities that account for geometric imperfections, residual stresses, second-order effects, and, in some cases, eccentric loading. The analytical

Enhanced magnetization drift velocity and current polarization in (CoFe)_{1-x}Ge_{x} alloys

February 17, 2011
Author(s)
Meng Zhu, Brian D. Soe, Robert D. McMichael, Matthew Carey, Stefan Maat, Jeffrey R. Childress
A spin wave Doppler technique is used to measure the drift velocity of the magnetization in current-carrying (CoFe)_{1-x}Ge_{x} alloys. For a current density of 10^11 A/m2, we obtain a large enhancement of drift velocity from 3.1+/-0.2 m/s for CoFe to 8.2+

Glossary of Key Information Security Terms

February 17, 2011
Author(s)
Richard L. Kissel
This glossary of key information security terms has been extracted from NIST Federal Information Processing Standards (FIPS), Special Publication (SP) 800 series, NIST Interagency Report (NIST IR) series, and the Committee for National Security Systems

Practical Operation of Cryogen-free Programmable Josephson Voltage Standards

February 17, 2011
Author(s)
Robert E. Schwall, David Zilz, Jeffrey Power, Charles J. Burroughs, Paul D. Dresselhaus, Samuel P. Benz
Cryogen-free operation is rapidly becoming the preferred implementation of programmable Josephson voltage standard (PJVS) systems. There are strong operational incentives for using the smallest possible cryocooler in order to minimize acoustic noise

A PROPOSED TECHNIQUE FOR DETERMINING AERODYNAMIC PRESSURES ON RESIDENTIAL HOMES

February 16, 2011
Author(s)
Tuan-Chun Fu, Aly Mousaad Aly, Arindam Chowdhury, Girma Bitsuamlak, DongHun Yeo, Emil Simiu
Wind loads on low-rise buildings in general and residential homes in particular can differ significantly depending upon the laboratory in which they were measured. The differences are due in large part to inadequate simulations of the low-frequency content

Industry Needs Workshop: Metrics and Tools for Sustainable Buildings

February 16, 2011
Author(s)
Barbara C. Lippiatt
Through its Metrics and Tools for Sustainable Buildings project, NIST is taking a lead role in providing science-based guidance to the building community on the life cycle environmental and economic performance of specific building types designed to meet

Workshop on Bridging Satellite Climate Data Gaps

February 16, 2011
Author(s)
Catherine C. Cooksey, Raju V. Datla
Detecting the small signals of climate change for the most essential climate variables requires that satellite sensors make highly accurate and consistent measurements. Data gaps in the time series (such as possible launch delay or failure) or

Effects of disorder on magnetic vortex gyration

February 15, 2011
Author(s)
Hongki Min, Robert McMichael, Jacques Miltat, Mark D. Stiles
A vortex gyrating in a magnetic disc has two regimes of motion in the presence of disorder. At large amplitudes the vortex core moves quasi-freely through the disorder potential. As the amplitude decreases, the core can become pinned at a particular point

Intensity Dynamics in a Waveguide Array Laser

February 15, 2011
Author(s)
Kevin L. Silverman, Mingming M. Feng, Richard P. Mirin, Steven T. Cundiff, Matt Williams, J. Nathan N. Kutz
We consider experimentally and theoretically the optical field dynamics of a five emitter laser array subject to a linearly decreasing injection current. We have achieved experimentally an array that produces a robust oscillatory power output with a nearly

Neutron Depth Profiling Technique for Studying Aging in Li-ion Batteries

February 15, 2011
Author(s)
Robert G. Downing
During operation of a Li-ion cell, lithium diffuses in and out of the solid phase anode and cathode. Measuring the lithium transport within the cell over its operational life could provide key information for understanding the loss of active lithium and

Ontology Summit 2010 Creating the Ontologists of the Future

February 15, 2011
Author(s)
Fabian M. Neuhaus
The goal of the Ontology Summit 2010 was to address the current shortage of persons with ontology expertise by developing a strategy for the education of ontologists. To achieve this goal we studied how ontologists are currently trained, the requirements

Analysis of Three Different Regression Models to Estimate the Ballistic Performance of New and Environmentally Conditioned Body Armor

February 14, 2011
Author(s)
Diane Mauchant, Michael A. Riley, Kirk D. Rice, Amanda L. Forster, Dennis D. Leber, Daniel V. Samarov
The performance standard for ballistic-resistant body armor published by the National Institute of Justice (NIJ), NIJ Standard 0101.06, recommends estimating the perforation performance of body armor by performing a statistical analysis on V50 ballistic
Displaying 25401 - 25425 of 73878
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