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.

Journals

Generation of 20 GHz, sub-40 fs pulses at 960 nm via repetition rate multiplication

April 1, 2009

Author(s)

Matthew S. Kirchner, Danielle Braje, Tara M. Fortier, A.M. Weiner, Leo Hollberg, Scott A. Diddams

Optical filtering of a stabilized 1 GHz optical frequency comb produces a 20 GHz comb with ~40 nm bandwidth (FWHM) at 960 nm. Using a low finesse Fabry-Perot

Variable Termination Unit for Noise-Parameter Measurements

April 1, 2009

Author(s)

Dazhen Gu, Dave K. Walker, James P. Randa

NIST has upgraded its measurement capability of noise parameters on low-noise amplifiers with a variable termination unit (VTU) in the 1 to 12.4 GHz frequency

A magnetic levitation technique for the simultaneous comparison of mass artifacts in air and vacuum.

April 1, 2009

Author(s)

Patrick J. Abbott, Zeina J. Kubarych, Ruimin Liu, Edwin R. Williams, Joe Chalfoun

We describe a mass comparison system in which a test mass artifact in air can be directly compared to a standard mass artifact in vacuum using the same high

Modelling of Thermodynamics and Diffusion in Multicomponent Systems

April 1, 2009

Author(s)

Ursula R. Kattner, Carelyn E. Campbell

The availability of reliable materials data is key to the successful design of materials and manufacturing processes. Commercial alloys rarely consist of only

The SIM Time Network and its Contributions to Metrology in the Americas

April 1, 2009

Author(s)

Michael A. Lombardi

The SIM Time Network (SIMTN) has been one of the great success stories of the Sistema Interamericano de Metrologia (SIM), a regional metrology organization (RMO

Improvements in the NIST Johnson Noise Thermometry System

April 1, 2009

Author(s)

Samuel P. Benz, Jifeng Qu, Horst Rogalla, D. R. White, Paul D. Dresselhaus, Weston L. Tew, Sae Woo Nam

We have developed a Johnson noise thermometry (JNT) system that is calibrated by precision waveforms synthesized with a quantized voltage noise source (QVNS)

Progress toward a 1 V Pulse-Driven AC Josephson Voltage Standard

April 1, 2009

Author(s)

Samuel P. Benz, Paul D. Dresselhaus, Alain Rufenacht, Norman F. Bergren, Joseph R. Kinard Jr., Regis Landim

We present a new record rms output voltage of 275 mV, which is a 25 % improvement over the maximum achieved with previous ac Josephson voltage standard (ACJVS)

Precision Differential Sampling Measurements of Low-Frequency Synthesized Sine Waves with an AC Programmable Josephson Voltage Standard

April 1, 2009

Author(s)

Alain Rufenacht, Charles J. Burroughs, Samuel P. Benz, Paul D. Dresselhaus, Bryan C. Waltrip, Thomas L. Nelson

We have developed a precision technique to measure sine wave sources with the use of a quantum-accurate ac programmable Josephson voltage standard. This paper

Systematic Error Analysis of Stepwise Approximated AC Waveforms Generated by Programmable Josephson Voltage Standards

April 1, 2009

Author(s)

Charles J. Burroughs, Alain Rufenacht, Samuel P. Benz, Paul D. Dresselhaus

We have measured stepwise-approximated sine waves generated by a Programmable Josephson Voltage Standard (PJVS) with several different output configurations

Comparison of Fluorometric and Spectrophotometric DNA Quantification for Real-time Quantitative PCR of Degraded DNA

April 1, 2009

Author(s)

Luke A. Shokere, Marcia J. Holden, G. Ronald Jenkins

Isogenic NK603 DNA was degraded by sonication or heat and quantified using A260 and a fluorescent dye method. qPCR experiments were conducted by amplifying an

AC susceptibility studies of magnetic relaxation in nanoparticles of Ni dispersed in silica

April 1, 2009

Author(s)

V Singh, M Seehra, John E. Bonevich

Temperature dependence of AC susceptibilities χ' and χ'' are reported using frequencies fm = 0.1 Hz, 1 Hz, 99 Hz, 499 Hz and 997 Hz for nanoparticles (NPs) of

Impact of polymer modulus on water accumulation at polymer / metal oxide interfaces

April 1, 2009

Author(s)

Alper Karul, Kar T. Tan, Christopher C. White, Donald L. Hunston, Steve marshall, Bulent Akgun, Sushil K. Satija, Christopher Soles, Bryan D. Vogt

Ambient moisture is known to accumulate at the interface between polymers and metal oxides, leading to detrimental consequences on physical properties such as

First Order Sideband Pulling in Atomic Frequency Standards

April 1, 2009

Author(s)

Jon H. Shirley, Thomas P. Heavner, Steven R. Jefferts

Many high performance atomic frequency standards, including cesium fountains and most optical standards, operate with pulsed measurements, that is, an atomic

Operating Margins for a Pulse-Driven Josephson Arbitrary Waveform Synthesizer Using a Ternary Bit-Stream Generator

April 1, 2009

Author(s)

Ernest Houtzager, Samuel Benz, Helko vanden Brom

We describe measurements with a pulse-driven Josephson arbitrary waveform synthesizer (JAWS) that uses a ternary arbitrary bit-stream generator as the bias

AC Power Standard Using a Programmable Josephson Voltage Standard

April 1, 2009

Author(s)

Bryan C. Waltrip, Bo Gong, Thomas L. Nelson, Yicheng Wang, Charles J. Burroughs, Alain Rufenacht, Samuel Benz, Paul Dresselhaus

This paper describes the implementation of a new quantum-based system for the generation of 120 V rms, 5 A rms, sinusoidal, active and reactive power over the

Cryocoolers: State of the art and recent developments

March 31, 2009

Author(s)

Ray Radebaugh

Cryocooler performance and reliability are continually improving. Consequently, they are more and more frequently implemented by physicists in their laboratory

Nanofluidic Structures with Complex Three Dimensional Surfaces

March 31, 2009

Author(s)

Samuel M. Stavis, Elizabeth Strychalski, Michael Gaitan

A fabrication process was developed to construct nanofluidic devices with complex three dimensional (3D) topographies. A single layer of grayscale

A Gas that Sinks in a Liquid the First Helium Experiment Published by Kamerlingh Onnes.

March 31, 2009

Author(s)

Johanna M.H. Levelt-Sengers

The year 1906 was a year of many remarkable achievements in the laboratory of Kamerlingh Onnes and his staff. The put into operation a hydrogen liquefier

Quasielastic neutron scattering study of hydrogen motion in NbC(0.71)H(0.28)

March 30, 2009

Author(s)

Terrence J. Udovic, Jeremy Cook, Alexander Skripov, Reinhard Hempelmann, Andrey Rempel, Aleksandr Gusev

In order to study the mechanism and parameters of H jump motion in the nonstoichiometric Nb carbides, we have performed quasielastic neutron scattering (QENS)

Elastic and adhesive properties of alkanethiol self-assembled monolayers on gold

March 30, 2009

Author(s)

Frank W. DelRio, Cherno Jaye, Daniel A. Fischer, Robert F. Cook

Elastic and adhesive properties of alkanethiol (CH3(CH2)n 1SH) self-assembled monolayers on gold are investigated by atomic force microscopy and correlated with

A History of Fire Testing: Past, Present, and Future.

March 30, 2009

Author(s)

James R. Lawson

This paper discusses the breakthroughs in science and engineering that have brought fire testing technology to its current state of maturity and provides

Characterization of Metal-Oxide Nanofilm Morphologies and Composition by Terahertz Transmission Spectroscopy

March 30, 2009

Author(s)

Edwin J. Heilweil, James E. Maslar, William A. Kimes, Nabil Bassim, Peter K. Schenck

An all-optical terahertz absorption technique for non-destructive characterization of nanometer-scale metal-oxide thin films grown on silicon substrates is

A Bose-Einstein Condensate in a Uniform Light-Induced Vector Potential

March 30, 2009

Author(s)

Yu-Ju Lin, Robert L. Compton, Abigail R. Perry, William D. Phillips, James V. Porto, Ian B. Spielman

We use a two-photon dressing field to create an effective vector gauge potential for Bose-condensed ^87Rb atoms in the F=1 hyperfine ground state. The dressed

MULTI-DISCIPLINARY LIFE-CYCLE METRICS AND TOOLS FOR GREEN BUILDINGS* Prepared for the Multi-Discipline Life Cycle Assessment Projects special section in Integrated Environmental Assessment and Management

March 29, 2009

Author(s)

Jennifer F. Helgeson, Barbara C. Lippiatt

Building sector stakeholders need compelling metrics, tools, data, and case studies supporting major investments in sustainable technologies. Proponents of

Optical detection of NMR _J-spectra at zero magnetic field

March 28, 2009

Author(s)

M Ledbetter, C.W. Crawford, A Pines, D.E. Wemmer, Svenja A. Knappe, John Kitching, D Budker

Nuclear magnetic resonance (NMR) has emerged as one of the most powerful analytical tools for elucidating molecular structure. One of the parameters typically

Profound asymmetry in the structure of the cAMP-free cAMP receptor protein (CRP) from Mycobacterium tuberculosis

March 27, 2009

Author(s)

David T. Gallagher, N N. Smith, Soo-Kyung Kim, Howard Robinson, Prasad T. Reddy

he bacterial cyclic AMP receptor protein (CRP) has been studied extensively as a model allosterically controlled transcription factor, despite the lack of a

Low-temperature plasma assisted nanotransfer printing between thermoplastic polymers

March 26, 2009

Author(s)

Deuk Y. Lee, Daniel R. Hines, Christopher Stafford, Christopher Soles, Eric K. Lin, Gottlieb Oehrlein

we performed a survey of the factors controlling the changes of the adhesion characteristics for PMMA and PET surfaces upon plasma activation of the respective

Role of Nanoscale Precipitates on the Enhanced Magnetostriction of Heat-Treated Galfenol (Fe_1-xGa^dx) Alloys

March 25, 2009

Author(s)

H Cao, Peter M. Gehring, Christopher Devreugd, Jose Rodriguez Rivera, D. Viehland

We report neutron diffuse scattering measurements on highly magnetostrictive Fe 1-xxGa x alloys (0.14 < x < 0.20) with different thermal treatments. This

Controlling the Formation and Orientation of Terraced Nanoscale Ribbons of a Thiophene-Based Copolymer

March 24, 2009

Author(s)

Dean M. DeLongchamp, Regis J. Kline, Youngsuk Jung, David Germack, Eric K. Lin, Andrew Moad, Lee J. Richter, Michael F. Toney, Martin Heeney, Iain McCulloch

Terraced nanoscale ribbon domains of a poly(2,5-bis(3-alkylthiophen-2-yl) thieno[3,2-b]thiophene) form after thin films are cooled from its highest-temperature

Major Applications of Electrochemical Techniques at National Metrology Institute

March 24, 2009

Author(s)

M Mariassy, Kenneth W. Pratt, Petra Spitzer

A review of the state of the art of electrochemical methods at the highest metrological level in National Metrology Institutes (NMIs) in given, with emphasis on

Was this page helpful?