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Journal of Research (NIST JRES)

Sensitivity Analysis of fatigue Crack growth Model for API Steels in Gaseous Hydrogen

March 20, 2014

Author(s)

Neha N. Rustagi, Elizabeth S. Drexler, Andrew Slifka

A model to predict fatigue crack growth of API pipeline steels in high pressure gaseous hydrogen has been developed and is presented elsewhere. The model...

The dissemination of mass in the United States: Results and implications of recent BIPM calibrations of US National Prototype Kilograms

March 12, 2014

Author(s)

Zeina J. Kubarych, Patrick J. Abbott

The National Institute of Standards and Technology (NIST) is responsible for the dissemination of the unit of mass within the United States of America through...

WWVB: A Half Century of Delivering Accurate Frequency and Time by Radio

March 12, 2014

Author(s)

Michael A. Lombardi, Glenn K. Nelson

In commemoration of its 50th anniversary of broadcasting from Fort Collins, Colorado, this paper provides a history of National Institute of Standards and...

Are Bragg Peaks Gaussian?

March 12, 2014

Author(s)

Boualem Hammouda

It is common practice to assume that Bragg scattering peaks have Gaussian shape. The Gaussian shape function is used to perform instrumental smearing...

Ambulance Design Survey 2011: A Summary Report

January 15, 2014

Author(s)

Yung-Tsun T. Lee, Deogratias Kibira, Allison Barnard Feeney, Jennifer L. Marshall

Current ambulance designs are ergonomically inefficient and often times unsafe for practical treatment response to medical emergencies. Thus, the patient...

The Importance of Dosimetry Standardization in Radiobiology

December 30, 2013

Author(s)

Marc F. Desrosiers, Larry A. DeWerd, James Deye, Patricia Lindsay, Mark K. Murphy, Michael G. Mitch, Francesca Macchiarini, Strahinja Stojadinovic, Helen Stone

Radiation dose is central too much of radiobiological research. Precision and accuracy of dose measurements and reporting of the measurement details should be...

Precise Measurement of Lunar Spectral Irradiance at Visible Wavelengths

November 12, 2013

Author(s)

Keith R. Lykke, John T. Woodward IV, Allan W. Smith, Claire E. Cramer

We report a measurement of lunar spectral irradiance with an uncertainty below 1 % from 420 nm to 1000 nm. This measurement uncertainty meets the stability...

The new kilogram definition and its implications for high-precision mass tolerance classes

August 26, 2013

Author(s)

Zeina J. Kubarych

The SI unit of mass, the kilogram, is the only remaining artifact definition in the seven fundamental quantities of the SI system. It will be redefined in terms...

Kiloampere, variable-temperature, critical-current measurements of high-field superconductors

August 19, 2013

Author(s)

Loren F. Goodrich, Najib Cheggour, Theodore C. Stauffer, James Filla, Xifeng Lu

We review variable-temperature, transport critical-current (Ic) measurements made on commercial superconductors over a range of critical currents from less than...

Calibration of traceable solid mock I-131 phantoms used in an international SPECT image quantification comparison

August 15, 2013

Author(s)

Brian E. Zimmerman, Leticia S. Pibida, Lynne E. King, Denis E. Bergeron, Jeffrey T. Cessna, Matthew M. Mille

The International Atomic Energy Agency (IAEA) has organized an international comparison to assess Single Photon Emission Computed Tomography (SPECT) image...

Polarization-Entangled Photon Pairs From Periodically-Poled Crystalline Waveguides Over a Range of Frequencies

August 15, 2013

Author(s)

Zachary H. Levine, Dylan A. Heberle

We propose a method to extend the range of polarization entanglement in periodically poled rubidium- doped potassium titanyl phosphate (Rb:KTP) and titanium in...

Registration of Six Degrees of Freedom Data with Proper Handling of Positional and Rotational Noise

June 6, 2013

Author(s)

Marek Franaszek

When two six degrees of freedom (6DOF) data are registered (e.g., robot-world/hand-eye calibration), a transformation is sought which minimizes the misalignment...

Recommendations for Improving Consistency in the Radiation Fields used During Testing of Radiation Detection Instruments for Homeland Security Applications

May 28, 2013

Author(s)

Matthew M. Mille, Bruce R. Norman, Leticia Pibida

Several measurements and calculations were performed to illustrate the differences that can be observed in the determination of exposure rate or ambient dose...

A Case Study of Performance Degradation Attributable to Run-Time Bounds Checks on C++ Vector Access

May 22, 2013

Author(s)

David W. Flater, William F. Guthrie

Programmers routinely omit run-time safety checks from applications because they assume that these safety checks would degrade performance. The simplest example...

HAZARDOUS CONTINUATION BACKWARD IN TIME IN NONLINEAR PARABOLIC EQUATIONS AND AN EXPERIMENT IN DEBLURRING NONLINEARLY BLURRED IMAGERY

April 25, 2013

Author(s)

Alfred S. Carasso

Identifying sources of ground water pollution, and deblurring nanoscale imagery, as well as astronomical galaxy images, often involves the numerical computation...

VASIR: An Open-Source Research Platform for Advanced Iris Recognition Technologies

April 22, 2013

Author(s)

Yooyoung Lee, Ross J. Micheals, James J. Filliben, P J. Phillips

The performance of iris recognition systems is frequently affected by input image quality, which in turn is vulnerable to less-than-optimal conditions due to...

A critical compilation of energy levels, spectral lines, and transition probabilities of singly ionized silver, Ag II

April 15, 2013

Author(s)

Alexander Kramida

All available experimental measurements of the spectrum of the Ag+ ion are critically reviewed. Systematic shifts are removed from the measured wavelengths. The...

Temperature Effect on the Nanostructure of SDS Micelles in Water

April 11, 2013

Author(s)

Boualem Hammouda

Sodium dodecyl sulfate (SDS) surfactants form micelles when dissolved in water. These are formed of a hydrocarbon core and hydrophilic ionic surface. The small...

Long-Wavelength Beam Steerer Based on a Micro-Electromechanical Mirror

March 1, 2013

Author(s)

Eyal Gerecht, Anthony B. Kos

Commercially available mirrors for scanning THz beams are too large to allow high-speed THz imaging. There is a need for smaller, more agile pointing apparatus...

Eddy Current Rail Inspection Using AC Bridge Techniques

February 26, 2013

Author(s)

Andrew D. Koffman, Bryan C. Waltrip, Yicheng Wang

AC bridge techniques commonly used for precision impedance measurements have been adopted to develop an eddy current sensor for rail defect detection. By using...

NIST System for Measuring the Directivity Index of Hearing Aids under Simulated Real-Ear Conditions

January 24, 2013

Author(s)

Randall P. Wagner

The directivity index is a parameter that is commonly used to characterize the performance of directional hearing aids, and is determined from the measured...

Weathering Patterns of Ignitable Liquids with the Advanced Distillation Curve Method

January 17, 2013

Author(s)

Samuel Allen, Thomas J. Bruno

One can take advantage of the striking similarity of ignitable liquid vaporization (or weathering) patterns and the separation observed during distillation to...

Critically Evaluated Energy Levels and Spectral Lines of Singly Ionized Indium (In II)

January 14, 2013

Author(s)

Alexander Kramida

A comprehensive list of the best measured wavelengths in the In II spectrum has been compiled. Uncertainties of the wavelength measurements have been analyzed...

Measurement of Scattering and Absorption Cross Sections of Dyed Microspheres

January 14, 2013

Author(s)

Adolfas Gaigalas, Steven J. Choquette

Measurements of absorbance and fluorescence emission were carried out on aqueous suspensions of polystyrene (PS) microspheres with a diameter of 2.5 µm...

Measurement of Scattering and Absorption Cross Sections of Microspheres for Wavelengths between 240 nm and 800 nm

January 10, 2013

Author(s)

Lili Wang, Steven J. Choquette, Adolfas Gaigalas

A commercial spectrometer with a 150 mm integrating sphere (IS) detector was used to measure the scattering and absorption cross sections of polystyrene...

Evaluation of the Current Status of the Combinatorial Approach for the Study of Phase Diagrams

December 21, 2012

Author(s)

Winnie K. Wong-Ng

This paper provides an evaluation of the effectiveness of using the high throughput combinatorial approach for preparing phase diagrams of thin film and bulk...

Optical-Fiber Power Meter Comparison between NIST and KRISS

December 21, 2012

Author(s)

Seungkwan Kim, Keesuk Hong, Dong-Hoon Lee, David J. Livigni, Xiaoyu X. Li, John H. Lehman

We describe the results of a comparison of reference standards between the National Institute of Standards and Technology (NIST-USA) and Korea Research...

Reduction Formulae for Products of Theta Functions

November 6, 2012

Author(s)

Peter L. Walker

In four cases it is already known that the product of two distinct Jacobian theta functions having the same variable z and the same nome q is a multiple of a...

Evolution of Microwave Spectroscopy at the National Bureau of Stansards (NBS) and the National Institute of Standards and Techology (NIST)

September 28, 2012

Author(s)

David R. Lide, Richard D. Suenram, Donald R. Johnson, Francis J. Lovas

This paper describes the beginning and evolution of microwave rotational spectroscopic research starting in 1954 at the National Bureau of Standards (NBS)...

A Model for Geometry-Dependent Errors in Length Artifacts

September 27, 2012

Author(s)

Daniel S. Sawyer, Brian Parry, Christopher J. Blackburn, Balasubramanian Muralikrishnan, Steven D. Phillips

We present a detailed model of dimensional changes in long length artifacts, such as step gauges and ball bars, due to bending under gravity. The comprehensive...

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