U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications

NIST Authors in Bold

Displaying 27101 - 27125 of 74066

Thermophysical Properties Measurements of Rocket Propellants RP-1 and RP-2

September 1, 2009
Author(s)
Stephanie L. Outcalt, Arno R. Laesecke, Karin Brumback
The density, speed of sound, and viscosity of two rocket propellants (RP-1 and RP-2) have been measured. The combined range of the data is from 270 K to 470 K with pressures to 40 MPa. The estimated uncertainty of the density data is 0.1 % and that of the

Uncalibrated Helium-Neon Lasers in Length Metrology

September 1, 2009
Author(s)
Jack A. Stone Jr.
The vacuum wavelength of a gas laser cannot vary from its central value by more than a few parts in 10^6. Consequently, an uncertainty of this magnitude can be assigned for the wavelength of the laser even if it has not been calibrated and even if the

Uncertainty calculation for spectral-responsivity measurements

September 1, 2009
Author(s)
John H. Lehman, Chih-Ming Wang, Marla L. Dowell, Joshua A. Hadler
This paper discusses a procedure for measuring the absolute spectral responsivity of optical-fiber power meters and computation of the calibration uncertainty. The procedure reconciles measurement results associated with a monochromator-based measurement

Virtual Cement and Concrete

September 1, 2009
Author(s)
Jeffrey W. Bullard, Chiara C. Ferraris, Edward Garboczi, Nicos Martys, Paul E. Stutzman, Judith E. Terrill
Design and optimization of cement or concrete mixes typically is accomplished by intensive trial-and-error experimentation, primarily because the design space has many parameters and because interactions between these parameters are incompletely understood

A Thermodynamic Analysis of Refilling of a Hydrogen Tank

August 31, 2009
Author(s)
Jiann C. Yang
A thermodynamic analysis of refilling of a gaseous hydrogen fuel tank is described. This study may lend itself to the applications of refilling a hydrogen storage tank onboard a hydrogen fuel cell vehicle. The gaseous hydrogen is treated as an ideal or a

Rapid Production of ^87^Rb BECs in a Combined Magnetic and Optical Potential

August 31, 2009
Author(s)
Yu-Ju Lin, Abigail R. Perry, Robert L. Compton, Ian B. Spielman, James V. Porto
We describe an apparatus for quickly and simply producing ^87^Rb Bose-Einstein condensates. It is based on a magnetic quadrupole trap and a red detuned optical dipole trap. We collect atoms in a magneto-optical trap (MOT) and then capture the atom in a

Compilation of Data on the Sublethal Effects of Fire Effluent

August 28, 2009
Author(s)
Erica D. Kuligowski
The NRC is developing guidance for performing quantitative human reliability analysis for post-fire mitigative human actions modeled in a fire probability risk assessment. In some of the scenarios, operators are assumed to be exposed to the fire effluent

FIRE FACTS

August 28, 2009
Author(s)
James R. Lawson
Fire Facts gives the reader an ordered series of temperature and heat flux values that may be associated to fire growth conditions and relates these exposure conditions to specific physical responses. The thermal conditions are presented in ascending order

Biometric Standards

August 27, 2009
Author(s)
Patrick J. Grother
This chapter is intended as an introduction to biometric standards, and as a survey of the major efforts in the field. Published consensus standards in a wide range of fields have existed for many years. Biometric standards, however, have been developed

Formal Representation of Product Design Specifications for Validating Product Designs

August 27, 2009
Author(s)
Alex Weissman, Satyandra K. Gupta, Xenia Fiorentini, Sudarsan Rachuri, Ram D. Sriram
Large scale distributed design projects increasingly result in designs that do not fully conform to the stated design goals or specifications. Hence, there is a need to validate these designs against various requirements. For projects with a large set of

Generation and Mixing of Subfemtoliter Aqueous Droplets on Demand

August 27, 2009
Author(s)
Kristian Helmerson, Jianyong N. Tang, Ana Jofre, Rani Kishore, Joseph E. Reiner, Mark E. Greene, Geoffrey M. Lowman, John Denker, Christina N. Willis, Lori Goldner
We describe a novel method of generating monodisperse sub-femtoliter aqueous droplets on demand by means of piezoelectric injection. Droplets with volumes down to 200 aL are generated by this technique. The droplets are injected into a low refractive index

STEP-OAGIS Harmonization Joint Working Group, PDM Subgroup Interim Report

August 27, 2009
Author(s)
Xenia Fiorentini, Sudarsan Rachuri
In any manufacturing enterprise, there are two types of tools used to create and share product related data across its extended network. The engineering information of the product is created using what is commonly called engineering authoring tool (e.g

A VVSG-derived model of election data

August 26, 2009
Author(s)
David W. Flater
An effort to define a common data format for voting systems should begin with a data model that specifies the relevant concepts. To accelerate adoption and minimize conflicts, such a model should define the smallest set of concepts needed by the desired

Documenting and Implementing Guidelines with Schematron

August 26, 2009
Author(s)
Joshua Lubell
Data exchange specifications must be broad and general in order to achieve acceptance, yet they must also be customizable in a controlled and interoperable manner in order to be useful. This paper describes an approach employing the Schematron language and

Energy Decay in Josephson Qubits from Non-equilibrium Quasiparticles

August 26, 2009
Author(s)
Jose A. Aumentado, John M. Martinis, M Ansmann
We calculate the energy decay rate of Josephson qubits and superconducting resonators from non-equilibrium quasiparticles. The decay rates from experiments are shown to be consistent with our predictions based on a prior measurement of the quasiparticle

Factors Affecting Quantification of Total DNA by UV Spectroscopy and PicoGreen Fluorescence

August 26, 2009
Author(s)
Marcia J. Holden, Ross J. Haynes, Savelas A. Rabb, Neena Satija, Kristina Yang, Joe Blasic
The amount of total DNA in a preparation extracted from tissues can be measured several ways, each method offering advantages and disadvantages. It is of interest for the sake of accuracy in quantitation to compare methodologies and determine if good

Input Data Management Methodology for Discrete Event Simulation

August 26, 2009
Author(s)
Nils E. Bengtsson, Guodong Shao, Yung-Tsun T. Lee, Swee K. Leong, Charles R. McLean, Bjorn Johansson, Anders Skoogh
Input Data Management (IDM) is a time consuming and costly process for Discrete Event Simulation (DES) projects. In this paper, a methodology for IDM in DES projects is described. The approach is to use a methodology to identify and collect data, then use
Displaying 27101 - 27125 of 74066