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Displaying 27626 - 27650 of 73830

Solutions of the Maxwell equations and photon wave functions

November 26, 2009
Author(s)
Peter J. Mohr
Properties of six-component electromagnetic field solutions of a matrix form of the Maxwell equations, analogous to the four-component solutions of the Dirac equation, are described. It is shown that the six-component equation, including sources, is

Structure and Hydration of Membranes Embedded with Voltage-Sensing Domains

November 26, 2009
Author(s)
Dmitriy Krepkiy, Mihaela Mihailescu, J. Alfredo Freites, Eric V. Schow, David Worcester, Klaus Gawrisch, Douglas Tobias, Stephen White, Kenton J. Swartz
Despite the growing number of atomic-resolution membrane protein structures, direct structural information about proteins in their native membrane environment is scarce. This problem is particularly relevant in the case of the highly-charged S1-S4 voltage

Electrical Conductivity and Relaxation in Poly(3-hexylthiophene)

November 25, 2009
Author(s)
Jan Obrzut, Kirt A. Page
ABSTRACT: We studied the complex conductivity of regio-regular poly(3-hexylthiophene) (P3HT) in the temperature range between 193K to 333 K (-80 C to 60 C) and in the frequency range from the direct current (DC) to 12 GHz. The identified relaxation process

Gas Flowmeter Calibrations With the 26 m 3 PVTt Standard

November 25, 2009
Author(s)
Aaron N. Johnson, John D. Wright
This document describes NIST s 26 m3 pressure, volume, temperature, and time (PVTt) primary flow standard. This standard is used to calibrate gas flow meters over a range extending from 200 standard L/min to 77,000 standard L/min where the reference

Hydrocarbon Liquid Flow Calibration Service

November 25, 2009
Author(s)
Tsyh Tyan Yeh, Jesus J. Aguilera, John D. Wright
This document provides a description of the NIST s new hydrocarbon liquid flow calibration system (HLFS) operated by the National Institute of Standards and Technology (NIST) Fluid Flow Group. The calibrator is used to provide hydrocarbon liquid flowmeter

Scalable multiplexed detector system for high-rate telecom-bandsingle-photon detection

November 25, 2009
Author(s)
Sergey V. Polyakov, Alan L. Migdall, Giorgio Brida, Ivo P. Degiovanni, Fabrizio Piacentini, V Schettini
We present a photon-counting detection system at telecom wavelengths that overcomes the difficulties of photon-counting at high rates. Our detection system uses active multiplexing, an array of N detectors, and a 1-by-N optical switch with a control

A METHODOLOGY FOR DETECTING RESIDUAL PHOSPHORIC ACID IN POLYBENZOXAZOLE FIBERS

November 24, 2009
Author(s)
Eun S. Park, John R. Sieber, Charles M. Guttman, Kirk D. Rice, Kathleen M. Flynn, Stephanie S. Watson, Gale A. Holmes
There is great interest in the degradation of ballistic fibers from exposure to sunlight and high humidity, because it directly affects the lives of people who use protective ballistic armor. However, to date, no mechanism has been found to explain how

A Program for Non-Collinear Phase-Matching Applications

November 24, 2009
Author(s)
N Boeuf, I Chaperot, E Dauler, G Jaeger, Andreas Muller, Alan L. Migdall
This is a program for calculating characteristics of collinear and non-collinear phase matching in both uniaxial and biaxial crystals. In particular, this program calculates the difference of the fast end slow indices of refraction as a function of angle

Movies of Optical Parametric Downconversion

November 24, 2009
Author(s)
A Rostapshov, D Martin, D A. Branning, E Dauler, S Thomas, Alan L. Migdall, N Boeuf, Andreas Muller
A series of photos of parametric downconversion are presented in movie format to help illustrate and understand the mechanics of parametric downconversion and phase matching.

NIST Calibration Services for Liquid Volume

November 24, 2009
Author(s)
Vern E. Bean, Pedro I. Espina, John D. Wright, J F. Houser, Sherry D. Sheckels, Aaron N. Johnson
NIST provides calibration services for metal volume provers for liquid volumes from 4 L to 7600 L using gravimetric and volumetric methods. This document describes the procedures and methods of calculation used in the calibration service. The covered

Ultra-Sensitive Optical Measurements of High-J Transitions in the O2 A-band

November 24, 2009
Author(s)
Daniel K. Havey, Joseph T. Hodges, David A. Long, Mitchio Okumura, Charles E. Miller
We report frequency-stabilized cavity ring-down spectroscopy measurements of high-J O2 A-band magnetic dipole line parameters. Our goals were to measure intensities and line shape parameters for the primary isotopologue of O2 in the A-band region and to

Gas Flowmeter Calibrations With the Working Gas Flow Standard

November 23, 2009
Author(s)
John D. Wright, Jean-Phillipe Kayl, Aaron N. Johnson, Gina M. Kline
The Working Gas Flow Standard (WGFS) uses critical venturis, critical nozzles, or laminar flowmeters as working standards to calibrate customer flowmeters. The working standards are periodically calibrated with primary standards: the 34 L, 677 L, or 26 m3

Performance Measurements Towards Improved Manufacturing Vehicle Safety

November 23, 2009
Author(s)
Roger V. Bostelman, William P. Shackleford
In this paper, we describe the current 2D (dimensional) sensor and ideal sensor configurations if 3D imagers are mounted on manufacturing vehicles in an attempt to make them more safe. Towards the ideal sensor configuration, three experiments were

Optimizing Acoustic Measurements of the Boltzmann Constant

November 22, 2009
Author(s)
Michael R. Moldover
We review the progress in acoustic metrology of gases that has occurred since the 1988 measurement of the universal gas constant R using a spherical acoustic resonator. The advances in understanding resonators and in calculating the thermophysical

Practical Interdomain Routing Security

November 20, 2009
Author(s)
David R. Kuhn, Simon Liu, Hart Rossman
This article reviews risks and vulnerabilities in interdomain routing, and best practices that can have near-term benefits for routing security. It includes examples of routing failures and common attacks on routers, and coutermeasures to reduce router

Cybersecurity Fundamentals for Small Business Owners

November 19, 2009
Author(s)
Shirley M. Radack
This bulletin summarizes the information that was published in NIST Interagency Report (NISTIR) 7621, Small Business Information Security: The Fundamentals, by Richard Kissel. The publication presents three major areas that small businesses should address
Displaying 27626 - 27650 of 73830
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