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Displaying 31901 - 31925 of 73929

An Automated Densimeter for the Rapid Characterization of Industrial Fluids

October 18, 2007
Author(s)
Stephanie L. Outcalt, Mark O. McLinden
An apparatus for the automated measurement of compressed liquid densities over the temperature range of 270 K to 470 K and pressures to 50 MPa is described. The heart of the apparatus is a commercial vibrating tube densimeter. In order to minimize the

Confinement, Entropy, and Single-Particle Dynamics of Equilibrium Hard-Sphere Mixtures

October 18, 2007
Author(s)
Jeetain Mittal, Vincent K. Shen, Jeffrey R. Errington, Thomas M. Truskett
We use discontinuous molecular dynamics and grand-canonical transition-matrix Monte Carlo simulations to explore how confinement between parallel hard walls modifies the relationships between packing fraction, self-diffusivity, partial molar excess entropy

Development of the Aerosol Particle Mass Analyzer

October 17, 2007
Author(s)
Nobuhiko Fukushima, Naoko Tajima, Kensei Ehara, Hiromu Sakurai, Kevin Coakley
The Aerosol Particle Mass Analyzer (APM), can classify particles according to their mass-to-charge ratio. The utility of the APM has been confirmed; the APM has been applied to atmospheric aerosol research and engine exhaust measurements. The operating

The State of Container Security Standards

October 17, 2007
Author(s)
Shaw C. Feng, Simon P. Frechette
As cargo container security is a critical component in the U.S. homeland security, the communication among people in a chain of custody of a container needs to be timely and effective. Since people in the container custody chain often use different

Crack Tip Opening Angle Optical Measurement Methods in Five Pipeline Steels

October 16, 2007
Author(s)
Philippe P. Darcis, Christopher N. McCowan, H. Windhoff, Joseph D. McColskey, Thomas A. Siewert
Crack tip opening angle (CTOA) is becoming one of the more widely accepted properties for characterizing fully plastic fracture. In fact, it has been recognized as a measure of the resistance of a material to fracture in cases where there is a large degree

Coherent transfer of an optical carrier over 251 km

October 15, 2007
Author(s)
Nathan R. Newbury, Paul A. Williams, William C. Swann
We transfer of an optical frequency over 251 km of optical fiber with a residual instability of 6×10 -19 at 100 s. This instability and the associated timing jitter are limited fundamentally by the noise on the optical fiber and link length. We give a

Fast and High Efficient Microfluidic PCR By Microwave Dielectric Heating

October 15, 2007
Author(s)
Pierre-Alain Auroux, Darwin R. Reyes-Hernandez, Jayna J. Shah, Michael Gaitan
We report 100% yield and 40% reaction-time reduction for on-chip DNA amplification using microwave dielectric heating. A passivation protocol has also been developed to suppress the inhibition of PCR in PMMA chips used with a temperature sensor. We finally

Narrow linewidth fiber laser frequency combs

October 15, 2007
Author(s)
William C. Swann, Ian R. Coddington, John Mcferran, Nathan R. Newbury
Fiber laser frequency combs can provide a series of optical lines that span the spectrum from 1 to 2 υm. By tightly locking the frequency comb to an optical reference, it is possible for these comb lines to exhibit residual linewidths below 1 Hz and

Spectra of W 39+ -W 47+ in the 12 nm to 20 nm Region Observed With an EBIT Light Source

October 14, 2007
Author(s)
Yuri Ralchenko, Joseph Reader, Joshua M. Pomeroy, Joseph N. Tan, John D. Gillaspy
We observed spectra of highly ionized tungsten in the extreme ultraviolet with an electron beam ion trap (EBIT) and a grazing incidence spectrometer at the National Institute of Standards and Technology. Stages of ionization were distinguished by varying

Parallel-Plate Rheometer Calibration Using Oil and Lattice Boltzmann Simulation

October 11, 2007
Author(s)
Chiara F. Ferraris, Nicos Martys, M R. Geiker, N V. Muzzatti
The flow in traditional rotational rheometers is well known and rheological parameters such as viscosity can be calculated relatively easily. On the other hand, when the fluid is a suspension that contains particles with a diameter up to 2 mm, these

Supplementary Backward Equations p(h,s) for the Critical and Supercritical Regions (Region 3), and Equations for the Two-Phase Region and Region Boundaries of the IAPWS Industrial Formulation 1997 for the Thermodynamic Properties of Water and Steam*

October 11, 2007
Author(s)
Allan H. Harvey, J S. Gallagher, H J. Kretzschmar, J R. Cooper, K Knobloch, Radim Mares, K Miyagawa, N Okita, Roland Span, I. Stocker, Wolfgang Wagner, I Weber
In modeling advanced steam power cycles, thermodynamic properties as functions of enthalpy and entropy are required in the critical and supercritical regions (region 3 of IAPWS-IF97). With IAPWS-IF97, these calculations require cumbersome two-dimensional

Guidelines on Securing Public Web Servers

October 9, 2007
Author(s)
Miles C. Tracy, Wayne Jansen, Karen A. Scarfone, Theodore Winograd
Web servers are often the most targeted and attacked hosts on organizations' networks. As a result, it is essential to secure Web servers and the network infrastructure that supports them. This document is intended to assist organizations in installing

Crack Propagation Across an Adhesive Interlayer in Flexural Loading

October 8, 2007
Author(s)
James J. Lee, H Chai, Isabel K. Lloyd, Brian R. Lawn
Crack propagation across interlayers separating adjoining brittle plates in flexure is studied using a model glass/epoxy/glass system. A transverse starter crack in the center glass plate is made to propagate to the nearest epoxy interface, where it

The First High-Resolution Analysis of the 10 [mu]m Absorption of Thioformaldehyde

October 8, 2007
Author(s)
J.- M. Flaud, Walter J. Lafferty, A. Perrin, Y S. Kim, Helmut Beckers
The 10 m region of thioformaldehyde (H2CS) has been recorded at high resolution (0.005 cm-1) using a Fourier transform spectrometer. H2CS was produced by low pressure pyrolysis of a gas flow of C3H5SCH3 in Ar at 560oC or CH3SCl at 1150o C which was

Uniform Calibration of Night Vision Goggles and Test Sets

October 8, 2007
Author(s)
George P. Eppeldauer
There are orders of magnitude differences between the ~0.1 % (k=2) uncertainty of NIST reference detector calibrations and the uncertainty of night vision (NV) goggle measurements. NIST developed a night vision radiometer calibration facility including NV
Displaying 31901 - 31925 of 73929
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