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Search Publications

NIST Authors in Bold

Displaying 17326 - 17350 of 73697

Calibration procedure for UV-365 integrated irradiance measurements

September 8, 2015
Author(s)
George P. Eppeldauer, Thomas C. Larason, Robert E. Vest, Uwe Arp, Howard W. Yoon
Since the CIE standardized rectangular-shape spectral response function for the 320 nm to 400 nm wavelength range can be realized only with large spectral mismatch, the realized UV-A meters have different response functions resulting in large errors in

Optomechanical reference accelerometer

September 8, 2015
Author(s)
Oliver Gerberding, Felipe Guzman, John T. Melcher, Jon R. Pratt, Jacob Taylor
We present an opto-mechanical accelerometer device with high dynamic range, high bandwidth and readout noise levels exceeding 10 μg/√Hz . The straightforward assembly and small cost of our device make it a prime candidate to perform on-site calibrations

Prospects for atomic clocks based on large ion crystals.

September 8, 2015
Author(s)
John J. Bollinger, Kyle Arnold, Elnur Haciyev, Chern Hui Lee, Eduardo Paez, M. D. Barrett
We investigate the feasibility of precision frequency metrology with large ion crystals. For clock candidates with a negative differential static polarisability, we show that micromotion effects should not impede the performance of the clock. Using Lu+ as

Standardization of UV LED measurements

September 8, 2015
Author(s)
George P. Eppeldauer, Thomas C. Larason, Howard W. Yoon
Traditionally used source spectral-distribution or detector spectral-response based standards cannot be applied for accurate UV LED measurements. Since the CIE standardized rectangular-shape spectral response function for UV measurements cannot be realized

Advances in Materials Science for Environmental and Energy Technologies IV (Preface)

September 4, 2015
Author(s)
Winnie K. Wong-Ng, Josef Matyas, Tatsuki Ohji, Kanakala Raghunath, Gary Pickrell
The Materials Science and Technology 2014 Conference and Exhibition (MS&T’14) was held October 12-16, 2014 at the David L. Lawrence Convention Center, Pittsburgh, Pennsylvania. One of the major themes of the conference was Environmental and Energy Issues

Broadband phase spectroscopy over turbulent air paths

September 4, 2015
Author(s)
Fabrizio R. Giorgetta, Greg B. Rieker, Esther Baumann, William C. Swann, Laura C. Sinclair, Jonathan Kofler, Ian R. Coddington, Nathan R. Newbury
Broadband atmospheric phase spectra are measured at sub-milliradian uncertainty corresponding to a 10-13 refractive index change, despite strong decoherence from atmospheric turbulence. A phase-sensitive dual-comb spectrometer acquires spectra over 233 cm

CONTAM User Guide and Program Documentation Version 3.2

September 4, 2015
Author(s)
William S. Dols, Brian J. Polidoro
This manual describes the computer program CONTAM version 3.2 developed by NIST. CONTAM is a multizone indoor air quality and ventilation analysis program designed to help you determine: airflow rates and pressures – infiltration, exfiltration, and room-to

Elasticity of Mass Artifacts in Sinusoidal Force Calibration

September 4, 2015
Author(s)
Akobuije D. Chijioke, John C. Bankert
Dynamic calibration of force transducers using sinusoidal acceleration of load mass objects requires the accurate determination of the displacement field in such masses, in order to relate accelerations measured at one or a few locations on the load mass

Primary Sinusoidal Calibration of Force Transducers up to 2 Kilohertz

September 4, 2015
Author(s)
Akobuije D. Chijioke, Nicholas A. Vlajic
We report the implementation of a swept-sine dynamic force calibration system at NIST. This system is designed to perform primary calibration of force transducers at frequencies up to 2 kHz and forces up to 2 kN. We show an example calibration of a strain

Comparing the Linewidths from Single-Pass SPDC and Singly-Resonant Cavity SPDC

September 3, 2015
Author(s)
Oliver T. Slattery, Lijun Ma, Paulina S. Kuo, Xiao Tang
Spontaneous parametric down-conversion (SPDC) is a common method to generate entangled photon pairs for use in quantum communications. The generated single photon linewidth is a critical issue for photon-atom interactions in quantum memory applications. We

Fluorous 'Ponytails' Lead to Strong Gelators Showing Thermally Induced Structure Evolution

September 3, 2015
Author(s)
Harshita Kumari, Sarah E. Armitage, Steven R. Kline, Krishna K. Damodaran, Stuart R. Kennedy, Jerry L. Atwood, Jonathan W. Steed
Appending perfluoroalkyl substituents to bis(urea) gelators results in significantly decreased interchain interactions with markedly thinner fibres and hence more cross-linked and more transparent gels with potential applications in the crystallisation of

iNEMI Project on Automotive Electronic Material Challenges

September 3, 2015
Author(s)
Yaw S. Obeng
Automobiles are incorporating more and more electronics from various industry sectors that have not been optimally designed for use inside the vehicle passenger compartment. Reliability and cost are two key considerations when incorporating traditional

International Round-Robin Study on Thermoelectric Transport Properties of n-type Half-Heusler from 300 K to 773 K

September 3, 2015
Author(s)
Hsin Wang, Shengqiang Bai, Lidong Chen, Alexander Cuenat, Giri Joshi, Holger Kleinke, Jan K?nig, Hee Woong Lee, Joshua Martin, Min-Wook Oh, Wallace Porter, Zhifeng Ren, James Salvador, Jeff Sharp, Patrick Taylor, Alan J. Thompson, Y. C. Tseng
International transport property measurement round-robins have been conducted by the Thermoelectric Annex under the International Energy Agency (IEA) Implementing Agreement on Advanced Materials for Transportation (AMT). The previous round-robins used

MEASURING PRESSURE AND VACUUM WITH LIGHT: A NEW PHOTONIC, QUANTUM-BASED, PRESSURE STANDARD

September 3, 2015
Author(s)
Jay H. Hendricks, Jacob E. Ricker, Jack A. Stone Jr., Patrick F. Egan, Gregory E. Scace, Gregory F. Strouse, Douglas A. Olson, Donavon Gerty
The future of pressure and vacuum measurement will rely on lasers and Fabry-Perot optical cavities, and will be based on fundamental physics of light interacting with a gas. Light interacts at the quantum level with matter such that light travels at a

PROGRESS ON MAGNETIC SUSPENSION FOR THE NIST VACUUM-TO-AIR MASS DISSEMINATION SYSTEM

September 3, 2015
Author(s)
Corey A. Stambaugh, Edward C. Mulhern, Eric C. Benck, Zeina J. Kubarych, Patrick J. Abbott
The redefined kilogram will be realized in vacuum and a method will be required to disseminate the standard to air. NIST has been developing a magnetic suspension system for this purpose. This paper discusses the progress to characterize and improve the

Quantitative magnetometry of ferromagnetic nanorods by microfluidic analytical magnetophoresis

September 3, 2015
Author(s)
Andrew L. Balk, Lamar O. Mair, Feng Guo, Carlos M. Hangarter, Pramod Mathai, Robert D. McMichael, Samuel M. Stavis, John Unguris
We introduce an implementation of magnetophoresis to measure the absolute magnetization of ferromagnetic nanorods dispersed in fluids, by analyzing the velocity of single nanorods under an applied magnetic field gradient. A microfluidic guideway prevents

Retention projection enables accurate calculation of liquid chromatographic retention times across labs and methods

September 3, 2015
Author(s)
Yamil Simon, Daniel Abate-Pella, Dana M. Freund, Yan Ma, Adrian Hegeman, Yan Ma, Tobias Kind, O Fiehn, Birgit Beck, Emma L. Schymanski, Corey D. Broeckling, David V. Huhman, Lloyd W. Summer, Oleg V. Krokhin, Dwight R. Stoll
Identification of small molecules by liquid chromatography-mass spectrometry (LC-MS) could be greatly improved if the chromatographic retention information could be used along with mass spectral information to narrow down the lists of potential identities

Viscosity Measurements of Aviation Turbine Fuels

September 3, 2015
Author(s)
Tara J. Fortin, Arno D. Laesecke
Kinematic viscosity has been measured for nine separate aviation turbine fuel samples. The nine samples span the range of fuel types available: conventional petroleum-derived fuels, synthetic fuels derived from the Fischer-Tropsch process, and renewable
Displaying 17326 - 17350 of 73697
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