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Conferences

Ultrasonic Detection of Defects in Multilayered Ceramic Capacitors for Active Implantable Medical Devices

August 8, 2011

Author(s)

Sudook A. Kim, Ward L. Johnson, Grady S. White, Roger Roberts

Resonant ultrasound spectroscopy (RUS) was used to measure the acoustic frequencies of surface-mountable X7R multilayered ceramic capacitors (MLCC), with the...

Precision spectroscopy with frequency combs at 3.4 υm

August 2, 2011

Author(s)

Esther Baumann, Fabrizio R. Giorgetta, William C. Swann, Alexander M. Zolot, Ian R. Coddington, Nathan R. Newbury

We discuss precision spectroscopy with a comb-based spectrometer at 3.4 υm. Our goal is to explore comb-based spectroscopy as an alternative method for fast...

Crowdsourcing and the NIST Digital Archives: Using the "crowd" to describe NIST Museum artifacts

August 2, 2011

Author(s)

Regina L. Avila, Andrea M. Medina-Smith

Experimental and computational assessment of robustness of steel and reinforced concrete framed buildings

August 1, 2011

Author(s)

Joseph A. Main, Yihai Bao, Fahim Sadek, Hai S. Lew

This paper presents an experimental and computational assessment of the performance of full-scale steel and reinforced concrete beam-column assemblies under...

Status of a compact cold-atom CPT frequency standard

July 31, 2011

Author(s)

Elizabeth A. Donley, Francois-Xavier R. Esnault, John E. Kitching, Eugene N. Ivanov

We describe the main progress towards the realization of a cold atom frequency standard based on coherent population trapping (CPT). We explain our particular...

Improving the stability and accuracy of the Yb optical lattice clock

July 31, 2011

Author(s)

Andrew D. Ludlow, Yanyi Jiang, Nathan D. Lemke, Jeffrey A. Sherman, J. von Stecher, Richard W. Fox, Long-Sheng Ma, A.M. Rey, Christopher W. Oates

We report results for improving the stability and uncertainty of the NIST $^{171}$Yb lattice clock. The stability improvements derive from a significant...

Towards an all-digital time scale

July 31, 2011

Author(s)

Stefania Romisch, Steven R. Jefferts, Thomas E. Parker

The implementation of an all-digital time scale is under way at NIST, using a novel 8-channel, all-digital phase measurement system based on subsampling...

Coordinating GPS Calibrations Among NIST, NRL, USNO, PTB, and OP

July 31, 2011

Author(s)

Marc A. Weiss, Victor S. Zhang, J White, K Senior, Demetrios Matsakis, S. Mitchell, P Uhrich, D Valat, W Lewandowski, G. Petit, Andreas Bauch, T. Feldman, A. Proia

Reviewing calibration results over the history since early 1980s among several labs shows very mixed results. The best stabilities of receivers, as given by...

Examination of Time and Frequency Control Across Wide Area Networks Using IEEE-1588v2 Unicast Transmissions

July 31, 2011

Author(s)

Andrew N. Novick, Marc A. Weiss, Kang B. Lee, Douglas D. Sutton

The IEEE 1588-2008 Precision Time Protocol (PTP) version 2 (IEEE 1588v2) can be used to synchronize a slave clock with a grandmaster clock over a wide area...

Synchronizing Computer Clocks Using Kalman Filters

July 31, 2011

Author(s)

Judah Levine

I have used the Kalman Filter algorithm to improve the link between the Internet Time Servers operated by the National Institute of Standards and Technology...

Comparing Room Temperature and Cryogenic Cesium Fountains

July 31, 2011

Author(s)

Steven R. Jefferts, Thomas P. Heavner, Thomas E. Parker, Jon H. Shirley, Elizabeth A. Donley, Filippo Levi, Davide Calonico, C Calosso, Giovanni Costanzo, B. Mongino

We have compared the frequency of a room temperature cesium fountain primary frequency standard with that of a cryogenic (~80K) cesium fountain. This comparison...

A Bayesian Statistical Model for Hybrid Metrology to Improve Measurement Accuracy

July 31, 2011

Author(s)

Richard M. Silver, Nien F. Zhang, Bryan M. Barnes, Jing Qin, Hui Zhou, Ronald G. Dixson

We present a method to combine measurements from different techniques that reduces uncertainties and can improve measurement throughput. The approach directly...

MOT Loading Enhancement with Stimulated Light Forces

July 31, 2011

Author(s)

Elizabeth A. Donley, Tara C. Liebisch, Eric M. Blanshan, John E. Kitching

We demonstrate atom number enhancement in a magneto-optical trap (MOT) by use of bichromatic cooling to slow an atomic beam that is loaded into a MOT...

Update on a Comparison of Cesium Fountain Primary Frequency Standards

July 31, 2011

Author(s)

Thomas E. Parker

An update to a previous long term frequency comparison of cesium fountain primary frequency standards has been made. This update covers the approximate three...

Transatlantic 2.5 MChip/s Two-Way Satellite Time and Frequency Transfer with Surface Acoustic Wave Filters

July 31, 2011

Author(s)

Victor S. Zhang, Thomas E. Parker, Joseph Achkar, Daniele Rovera

From August 2010 to April 2011, NIST and OP conducted an experiment of using surface acoustic wave (SAW) filters in transatlantic two-way satellite time and...

Limited Live-time Measurements of Frequency Spectra

July 31, 2011

Author(s)

David A. Howe, Neil Ashby, Danielle G. Lirette, Archita Hati, Craig W. Nelson

Frequency-difference-of-arrival (FDOA) can be used to monitor and track an emitters location by observing Doppler frequency shifts of the carrier during short...

Residual PM Noise Evaluation of Radio Frequency Mixers

July 31, 2011

Author(s)

Corey A. Barnes, Archita Hati, Craig W. Nelson, David A. Howe

Direct observation of phase modulated (PM) noise is often difficult due to the high dynamic range that exists between the carrier and the modulated sidebands. A...

Alternative Variables for Computing Sideband Pulling in Atomic Frequency Standards

July 31, 2011

Author(s)

Jon H. Shirley

Sideband pulling has long been considered a possible source of frequency bias in atomic frequency standards. We treat a two-level system excited by coherent...

Vibration Sensitivity of Optical Components: A Survey

July 31, 2011

Author(s)

Archita Hati, Craig W. Nelson, David A. Howe

We propose and demonstrate a novel technique to measure the vibration sensitivity of two-port fiber-based optical components. It uses a common-arm counter...

Smart Clocks Have a Hand in the Smart Grid

July 29, 2011

Author(s)

Jeffrey Fletcher, Dhananjay Anand, Maruthi Chaluvadi, Julien M. Amelot, Ya-Shian Li-Baboud, James Moyne

Clock synchronization is becoming an increasingly important characteristic of modern wide area monitoring and control systems such as the power grid. It...

Lithography and Chemical Modeling of Acid Amplfiers for Use in EUV Photoresists

July 28, 2011

Author(s)

Kirstin Kruger, craig higgins, Gregg M. Gallatin, Robert Brainard

We postulate that the best way to simultaneously improve resolution, line edge roughness (LER), and sensitivity all in EUV resists is to increase the number of...

Magnetic Tunnel Junctions Fabricated Using Ion Neutralization Energy as a Tool

July 25, 2011

Author(s)

Joshua M. Pomeroy, Holger Grube, Pei-Ling Sun, Yun-Che Wang, Russell E. Lake

The neutralization energy of highly charged ions (HCIs) is used as an intermediate processing step to modify the electrical properties of magnetic tunnel...

Extraction of Reflectivity From Microwave BlackBody Target Using Free-Space Measuements

July 24, 2011

Author(s)

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

We report on the characterization of blackbody target reflections as part of the recent progress on the development of brightness temperature standards for...

Large-Area Overhead Manipulator for Access of Fields

July 22, 2011

Author(s)

Jeffrey W. White, Roger V. Bostelman

Multi-axis, cable-driven manipulators have evolved over many years providing large area suspended platform access, programmability, relatively rigid and...

Used Nuclear Fuel Transportation Package Seal Performance inBeyond Design Basis Thermal Conditions

July 21, 2011

Author(s)

Jiann Yang, Edward Hnetkovsky, Felix Gonzalez, Christopher Bajwa, Robert Einziger, Earl Easton

The U.S. Nuclear Regulatory Commission (NRC) is evaluating the performance of seals in used fuel transportation packages during beyond-design-basis fires...

Predicting Failure in Complex Systems by Perturbing Markov Chain Models

July 21, 2011

Author(s)

Christopher E. Dabrowski, Fern Y. Hunt

In recent years, substantial research has been devoted to monitoring and predicting performance degradations in real-world complex systems within large entities...

Gas Hydrate Research Database and Options for Data Exchange

July 21, 2011

Author(s)

Kenneth G. Kroenlein, Chris D. Muzny, Vladimir Diky, Robert D. Chirico, Michael D. Frenkel, E. D. Sloan

To facilitate advances in application of technologies pertaining to gas hydrates, a freely available data resource containing experimentally derived information...

A public randomness service

July 21, 2011

Author(s)

Michael J. Fischer, Michaela Iorga, Rene Peralta

We argue for the deployment of sources of randomness on the Internet for promoting and enhancing electronic commerce. We describe, in rough detail, our planned...

Cloud Service Feature Driven Security Policies for Virtualized Infrastructures

July 19, 2011

Author(s)

Ramaswamy Chandramouli

With the increasing maturity of various cloud service delivery models (Software as a Service (SaaS), Platform as a Service (PaaS), Infrastructure as a Service...

Advanced Image Composition with Intra-Frame Drift Correction

July 19, 2011

Author(s)

Petr Cizmar, Andras Vladar, Michael T. Postek

Drift Corrected Image Composition (DCIC) is a real-time technique that allows for acquiring significantly more accurate images compare to traditional slow or...

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