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Search Publications

NIST Authors in Bold

Displaying 31201 - 31225 of 73697

Recent Advances in Fire-Structure Analysis

February 1, 2008
Author(s)
Dat Duthinh, Kevin B. McGrattan, Abed M. Khaskia
One of the recommendations of the National Construction Safety Team for the Federal Building and Fire Safety Investigation of the World Trade Center Disaster (NIST NCSTAR 1, 2005) is to enhance the capability of available computational software to predict

The Accuracy and Stability of Quartz Watches

February 1, 2008
Author(s)
Michael A. Lombardi
A short review article about quartz wristwatches that presents measurements of their accuracy and stability. Measurements of both the stepping motors and crystal oscillators inside four quartz watches are made over a 30-day interval, and the results are

Design and Validation of a Whegs Robot in USARSim

January 31, 2008
Author(s)
B K. Taylor, Stephen B. Balakirsky, Elena R. Messina, R D. Quinn
Simulation of robots and other vehicles in a virtual domain has multiple benefits. End users can use the simulation as a training tool to increase their familiarity and skill with the vehicle without risking damage to the robot, potential bystanders, or

Fermi-Fermi Mixtures in the Strong Attraction Limit

January 31, 2008
Author(s)
Menderes Iskin, Carlos Sa de Melo
The phase diagrams of low density Fermi-Fermi mixtures with equal or unequal masses and equal or unequal populations are described at zero and finite temperatures in the strong attraction limit. In this limit, the Fermi-Fermi mixture can be described by a

Freestyle Data Fitting and Global Temperatures

January 31, 2008
Author(s)
Barend J. Thijsse, Bert W. Rust
This paper presents a method for separating signal (trend) from noise in a set of measured bivariate data when there is no mathematical model for that signal. The algorithm models the signal with a smoothing spline for which the number and location of the

Secure Web Servers: Protecting Web Sites That Are Accessed by the Public

January 31, 2008
Author(s)
Shirley M. Radack
This bulletin summarizes the contents of NIST Special Publication 800-44, Version 2, Guidelines on Securing Public Web Servers. The publication details the steps that organizations should take to plan, install, and maintain secure Web server software and

Gain-assisted superluminal optical solitons at very low light intensity

January 30, 2008
Author(s)
Lu Deng, Guoxiang Huang, C Hang
We show the possibility of generating gain-assisted superluminal optical solitons in a room- temperature three-state active Raman gain medium. We demonstrate both analytically and numerically that under appropriate conditions a signal field of very low

Green Fluorescent Protein in Inertially Injected Aqueous Nanodroplets

January 30, 2008
Author(s)
Jianyong Tang, Ana Jofre, Geoffrey Lowman, Rani Kishore, Joseph E. Reiner, Kristian Helmerson, Lori S. Goldner, M E. Greene
We inertially inject and study the contents of optically trappable aqueous nanodroplets (hydrosomes) emulsified in a perfluorinated matrix. A new piezoelectric actuated device for production of single hydrosomes on demand is introduced. Hydrosomes

Density of states measurements of Al lightly doped with Mn

January 29, 2008
Author(s)
Galen O'Neil, Dan Schmidt, Nathan A. Tomlin, Joel Ullom, Kent D. Irwin, Anthony S. Williams, Gerry Arnold, Steve T. Ruggiero
Al lightly doped with Mn is a tunable superconductor, potentially useful in normalmetal/insulator/superconductor refrigerators. The superconducting transition temperature varies with Mn concentration and the density of states is like a BCS superconductor

An Optical System for Body Imaging from a Distance Using near-TeraHertz Frequencies

January 26, 2008
Author(s)
William Duncan, Robert E. Schwall, Kent D. Irwin, James A. Beall, Carl D. Reintsema, W.Bertrand (Randy) Doriese, Hsiao-Mei Cho, Brian Estey, Goutam Chattopadhyay, Peter Ade, Carole Tucker
We present the outline of the optical design of a TeraHertz (THz) imager for the detection of shrapnel-loaded improvised explosive devices (IED''s) at ''stand-off'' distances of 14 - 26 meters. The system will use 4 antenna-coupled TES detector arrays of

Analysis of Nuclear Material by Alpha Spectroscopy with a Transition-Edge Microcalorimeter

January 26, 2008
Author(s)
Rob Horansky, Joel Ullom, James A. Beall, Gene C. Hilton, Kent D. Irwin, Leila R. Vale, Don Dry, Stephen Lamont, Clifford R. Rudy, Michael W. Rabin
We present measurements from a cryogenic microcalorimeter designed to detect alpha particles. The enhanced resolution of microcalorimeter alpha detectors will provide new capabilities for actinide analysis. We demonstrate a spectral resolution of 2.4 keV

A TDMA Hybrid SQUID Multiplexer

January 25, 2008
Author(s)
Carl D. Reintsema, James A. Beall, W.Bertrand (Randy) Doriese, William Duncan, S. L. Ferreira, Gene C. Hilton, Kent D. Irwin, Dan Schmidt, Joel Ullom, Leila R. Vale, Yizi Xu
We have developed a multiplexed read-out for transition edge sensors based on a hybrid time- and frequency-domain basis set, similar to that used in time-division multiple-access (TDMA) mobile phones. The hybrid basis set uses bandwidth more efficiently

Characterization of 26 miniSTR loci for improved analysis of degraded DNA samples

January 25, 2008
Author(s)
Carolyn R. Steffen, Margaret C. Kline, Michael Coble, John M. Butler
An additional 20 novel mini-short tandem repeat (miniSTR) loci have been developed and characterized to aid in the analysis of degraded DNA samples. These new markers produce short PCR products in the target range of 50 150 base pairs (bp) by moving the

Determination of Work Functions in the Ta 1-x Al x N y /HfO 2 Advanced Gate Stack Using Combinatorial Methodology

January 24, 2008
Author(s)
Kao-Shuo Chang, Martin L. Green, Jason Hattrick-Simpers, John S. Suehle, Ichiro Takeuchi, Ozgur Celik, S De Gendt
Combinatorial methodology enables the generation of comprehensive and uniform samples, and therefore data sets, compared to the one-composition-at-a-time approach. We demonstrate the efficacy of combinatorial methodology applied to Ta1-xAlxNy alloys as

Hydrogenization of Zr 0.9 Ti 0.1 Cr x Fe 2-x Intermetallic Compounds: Free Electron Model for Magnetic Susceptibility and Thermoelectric Power

January 24, 2008
Author(s)
S. Niyomsoan, P. Termsuksawad, Ronald B. Goldfarb, David Olson, B. Mishra, Z Gavra, V I. Kaydanov
The magnetic susceptibility and thermoelectric power of Zr 0.9Ti 0.1Cr xFe 2-x intermetallic compounds were investigated as functions of hydrogen content. The alloys are all paramagnetic, with magnetic susceptibility and Seebeck coefficient increasing with

Large array of multiplexed gamma-ray microcalorimeters for nuclear-materials analysis

January 24, 2008
Author(s)
W.Bertrand (Randy) Doriese, Joel Ullom, James A. Beall, William Duncan, S. L. Ferreira, Gene C. Hilton, Rob Horansky, Kent D. Irwin, John Mates, Carl D. Reintsema, Dan Schmidt, Leila R. Vale, Yizi Xu, Barry L. Zink, Michael W. Rabin, Minesh K. Bacrania, Stephen Lamont, Andrew Hoover, Clifford R. Rudy, Duc Vo, C. K. Stahle, Kevin R. Boyce, Larry E. Brown, Jonathan M. King, F. S. Porter
We are developing a gamma-ray spectrometer for the analysis of nuclear materials based on an array of superconducting transition-edge-sensor microcalorimeters. The instrument includes eight columns of time-division-SQUID multiplexing circuitry capable of

Materials Analysis with Cryogenic Sensors

January 24, 2008
Author(s)
Joel N. Ullom
Low temperature photon detectors are increasingly attractive tools for materials analysis. Their range of applications has broadened from early work on x-ray fluorescence and now spans the electromagnetic spectrum from terahertz to gamma-ray energies. In

Combinatorial Methodology for the Exploration of Metal Gate Electrodes on HfO 2 for the Advanced Gate Stack

January 23, 2008
Author(s)
Kao-Shuo Chang, Martin L. Green, John S. Suehle, Jason Hattrick-Simpers, Ichiro Takeuchi, K Ohmori, T Chikyow, S De Gendt, Prashant Majhi
Combinatorial methodology offers an efficient platform to accelerate the exploration of new materials. We demonstrate the effectiveness of this technique on the study of new metal gates for the advanced gate stack. We report two examples, Ni-Ti-Pt ternary

Moving Toward Semantic Interoperability of Medical Devices

January 22, 2008
Author(s)
John J. Garguilo, Sandra I. Martinez, Richard M. Rivello, Maria Cherkaoui
NIST researchers are collaborating with medical device experts to facilitate the development and adoption of standards for medical device communications throughout the healthcare enterprise as well as integrating it into the electronic health record. NIST

Operation of an X-ray transition-edge sensor cooled by tunnel junction refrigerators

January 19, 2008
Author(s)
Nathan A. Tomlin, James A. Beall, Gene C. Hilton, Kent D. Irwin, Galen O'Neil, Dan Schmidt, Leila R. Vale, Joel Ullom
We demonstrate successful cooling of an X-ray transition-edge sensor (TES) using solid-state refrigerators based on normal-metal/insulator/superconductor (NIS) tunnel junctions. Above the TES transition temperature (Tc), we use Johnson noise thermometry to

256-Channel Magnetic Imaging System

January 18, 2008
Author(s)
Fabio C. da Silva, Sean Halloran, Anthony B. Kos, David P. Pappas
We present the design and fabrication of a magentoresistive imaging system capable of measuring 256 channels simultaneously along linear ranges of 4 mm and 13 mm. The channels are interfaced by custom electronics and the images are displayed in real time

Constraints on a Synthetic-Noise Source for Johnson Noise Thermometry

January 18, 2008
Author(s)
David R. White, Samuel Benz
Conventional Johnson noise thermometers based on switching correlators have conflicting matching requirements for the sensing resistance. To mitigate distortion effects in the correlator, the RT products of the two sensors must be the same, and to mitigate
Displaying 31201 - 31225 of 73697
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