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.

Conferences

Displacement Sensor for Detecting Sub-micrometer Motion

July 6, 2012

Author(s)

Svetlana Avramov-Zamurovic1, Jae M. Yoo, Nicholas Dagalakis, Rae Duk Lee

This paper describes the design of a nano displacement sensor that detects the presence of a moving platform by using fringing electric field. Its electrodes...

International time and frequency comparisons in real time: recent results

July 2, 2012

Author(s)

Michael A. Lombardi, J. Mauricio Lopez-Romero, Nelida Diaz-Munoz, Eduardo de Carlos Lopez

Within the Sistema Interamericano de Metrologia (SIM) region, a time comparison network, SIMTN, has been developed. The SIMTN continuously compares the time...

The Permanent Magnet System for NIST-4

July 2, 2012

Author(s)

Stephan Schlamminger

At the National Institute of Standards and Technology a new watt balance, NIST-4, is currently being designed. This apparatus will be used to realize the base...

On the Molar Mass of Silicon for a New Avogadro Constant

July 1, 2012

Author(s)

Gregory C. Turk, Robert D. Vocke Jr., Savelas A. Rabb

Calibration Techniques for Scanning Microwave Microscopy

July 1, 2012

Author(s)

Thomas M. Wallis, Atif A. Imtiaz, Alexandra Curtin, Pavel Kabos, H. P. Huber, Joseph J. Kopanski, F. Kienberger

Two techniques are described for calibrating a scanning microwave microscope (SMM). The first technique enables spatially-resolved absolute capacitance...

A Direct Comparison System for Power Calibration up to 67 GHz*

July 1, 2012

Author(s)

Thomas M. Wallis, Thomas P. Crowley, Denis X. LeGolvan, Ronald A. Ginley

A direct comparison system for calibration of power sensors with 1.85 mm precision coaxial connectors up to 67 GHz has been developed. The comparison is...

A Verification Method for Noise-Temperature Measurements on Cryogenic Low-Noise Amplifiers

July 1, 2012

Author(s)

Dazhen Gu, Derek A. Houtz, James P. Randa, Dave K. Walker

We report a verification method for noise-temperature (NT) measurements on cryogenic low noise amplifiers (LNAs) at liquid helium temperature. The method uses...

Standardizing Rectangular Metallic Waveguides for Terahertz Applications

July 1, 2012

Author(s)

Ronald A. Ginley, N M. Ridler

This paper describes an on-going activity to develop an international document standard for defining rectangular metallic waveguides for use in the...

Method for Ensuring Accurate AC Waveforms with Programmable Josephson Voltage Standards

July 1, 2012

Author(s)

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

The amplitudes of stepwise-approximated sine waves produced by programmable Josephson voltage standards (PJVSs) are not intrinsically accurate because the...

Testing Phasor Measurement Units Using IEEE 1588 Precision Time Protocol

July 1, 2012

Author(s)

Julien M. Amelot, Gerard Stenbakken

As the electric power grid is changing to a smarter more dynamically controlled system, there is increasing need for measurements that show the global status of...

Testing Phasor Measurement Units using the IEEE 1588 Precision Time Protocol

July 1, 2012

Author(s)

Julien M. Amelot, Gerard N. Stenbakken

As the electric power grid is changing to a smarter more dynamically controlled system, there is increasing need for measurements that show the global status of...

The Planck constant, watt and vacuum balances, and an evolving Mise en pratique for the kilogram in North America

July 1, 2012

Author(s)

Jon R. Pratt, David B. Newell, Zeina J. Kubarych, Stephan Schlamminger, Darine El Haddad, Ruimin Liu, Edwin R. Williams, Dave Inglis, Barry M. Wood, Carlos Sanchez, Richard Green

We report preparations underway at the National Institute of Standards and Technology (NIST) in the United States and at the National Research Council (NRC) in...

Towards a fixed value of the Planck constant: reproducibility and an updated NIST-3 watt balance

July 1, 2012

Author(s)

Darine El Haddad, Stephan Schlamminger, David B. Newell, Ruimin Liu, Edwin R. Williams, Jon R. Pratt

The scientific community is presently engaged in a historic attempt to fix the value of the Planck constant h so that it might ultimately serve as a base...

Flat frequency response in the electronic measurement of the Boltzmann constant

July 1, 2012

Author(s)

Jifeng Qu, Samuel Benz, Yang Fu, Jianqiang Zhang, Horst Rogalla, Alessio Pollarolo

A new quantum voltage calibrated Johnson noise thermometer (JNT) was developed at NIM to demonstrate the electrical approach that determines the Boltzmann...

Johnson Noise Thermometry Measurement of the Boltzmann Constant with a 200 Ohm Sense Resistor

July 1, 2012

Author(s)

Alessio Pollarolo, Tae H. Jeong, Samuel Benz, Horst Rogalla

In 2010 NIST measured the Boltzmann constant k by use of an electronic technique that measured the Johnson noise of a 100 Ohm resistor at the triple point of...

Differential Sampling Measurement of a 7 V rms Sine Wave and a Programmable Josephson Voltage Standard

July 1, 2012

Author(s)

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

A 10 V programmable Josephson voltage standard has enabled sine waves with rms voltages up to 7 V to be accurately measured with differential sampling methods...

A Digital-to-Analog Converter with a Voltage Standard Reference

July 1, 2012

Author(s)

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

Commercially available 20-bit digital to analog converters (DACs) have the potential to impact the field of low frequency voltage metrology. We measured a...

Quantum Calibration System for AC Measurement Standards using Inductive Voltage Dividers

July 1, 2012

Author(s)

Thomas Hagen, Ilya F. Budovsky, Samuel Benz, Charles J. Burroughs

A pulse driven ac Josephson voltage standard (ACJVS) has been set up at the National Measurement Institute, Australia (NMIA) with the help of the National...

Maximum Life Span Strategy for Target Tracking in Mobile Sensor Networks

June 29, 2012

Author(s)

Vladimir V. Marbukh, Kamran Sayrafian, Hamid Mahboubi, Amir G. Aghdam, Walid Masoudimansour

In this paper, an energy-efficient technique is proposed for tracking a target in a field using a network of mobile sensors while maximizing the life span of...

Safe Control of Manufacturing Vehicles Research Towards Standard Test Methods

June 28, 2012

Author(s)

Roger V. Bostelman, William P. Shackleford, Geraldine S. Cheok, Kamel S. Saidi

The National Institute of Standards and Technology's Intelligent Systems Division has been researching several areas leading to safe control of manufacturing...

RESONANCE ENERGY TRANSFER AS A TOOL FOR PROBING INTERFACE FORMATION IN NANOCOMPOSITES

June 24, 2012

Author(s)

Mauro Zammarano, Edward D. McCarthy, Douglas M. Fox, Paul H. Maupin, Li Piin Sung, Yeon S. Kim

One of the most enduring problems in the evolution of science and technology using nanoscale materials is the characterization of their morphology in...

Solid-Phase Synthesis of Ammonium Ionenes

June 24, 2012

Author(s)

Matthew T. Hunley, Kathryn L. Beers

Ionenes are polyelectrolytes with the charge along the polymer backbone. These polymers possess a precisely-defined charge density, making them ideal as...

Synthesis and characterization of model crosslinked polyamide films for water purification

June 24, 2012

Author(s)

Peter M. Johnson, Edwin Chan, Jun Y. Chung, Junghyun Lee, Christopher Stafford

Reverse osmosis (RO) and nanofiltration (NF) membranes are comprised of a dense active layer supported by a porous support. Commercial active layer are highly...

Establishing Traceability of an Electronic Calibration Unit Using the NIST Microwave Uncertainty Framework

June 22, 2012

Author(s)

Jeffrey A. Jargon, Dylan F. Williams, Thomas M. Wallis, Denis X. LeGolvan, Paul D. Hale

We present a method for providing traceability to a commercial electronic calibration unit for vector network analyzers by characterizing its scattering...

TESTING LONG-WAVELENGTH ACOUSTIC FLOWMETER CONCEPTS FOR FLUE GAS FLOWS

June 22, 2012

Author(s)

Lee J. Gorny, Keith A. Gillis, Michael R. Moldover

As a part of NISTs program to standardize measurements of greenhouse gas emissions, we are developing a long-wavelength acoustic flowmeter (LWAF) for accurate...

Quantitative evaluation of digital image correlation as applied to large-scale gusset plate experiments

June 21, 2012

Author(s)

Mark A. Iadicola, Robert S. Zobel, Justin M. Ocel

As part of the National Cooperative Highway Research Project 12-84 "Guidelines for the Load and Resistance Factor Design and Rating of Gusset-Plate Connections...

Improved Nozzle Manifold for Gas Flow Calibrations

June 20, 2012

Author(s)

Aaron N. Johnson, Chunhui Li, John D. Wright, Gina M. Kline, Christopher J. Crowley

We developed a new nozzle manifold that reduced the uncertainty of flow calibrations from 0.09 % to as low as 0.074 % for flows of air up to 0.84 kg/s (43 000 L...

Tests of the Extended Lee Model Using Three Different Turbine Meters

June 20, 2012

Author(s)

Jodie G. Pope, John D. Wright, Sherry D. Sheckels

We report additional tests of our extended Lee model for calibrating turbine meters. The model accounts for 1) Reynolds number (Re) dependent drag and lift, 2...

Airspeed Calibration Services: Laser Doppler Anemometer Calibration and Its Uncertainty

June 20, 2012

Author(s)

Iosif I. Shinder, Michael R. Moldover, J. M. Hall, Mike Duncan, Joe Keck

The National Institute of Standards and Technology (NIST) and the Oak Ridge National Laboratory (ORNL) are improving their airspeed calibration services. Both...

Uptake and Elimination Behaviors of Polyethyleneimine (PEI)-Coated Multi-Walled Carbon Nanotubes by Eisenia foetida and Daphnia magna

June 20, 2012

Author(s)

Elijah J. Petersen

Determining the effects of various surface coatings on carbon nanotubes (CNTs) is critical given the numerous expected applications of CNTs and their inevitable...

Was this page helpful?