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Search Publications

NIST Authors in Bold

Displaying 5476 - 5500 of 13218

Developing Unique Non-Target High Resolution Mass Spectrometry Signatures to Track Contaminant Sources in Urban Waters

October 14, 2020
Author(s)
Bowen Du, Zhenyu Tian, Katherine Peter, Edward P. Kolodziej, Charles S. Wong
… Non-point source pollution in urban receiving waters often adversely impacts both humans … fingerprints/signatures for improved source tracking. In particular, we applied non-target HRMS to characterize and … (both known and unidentified chemicals) that co-occurred in all roadway runoff and wastewater influent samples, …

Transport dynamics in a high-brightness magneto-optical-trap Li ion source

September 15, 2020
Author(s)
Jamie Gardner, William R. McGehee, Mark D. Stiles, Jabez J. McClelland
… associated with microkelvin- level temperatures results in a very low emittance, high-brightness ion beam. In a magneto- optical-trap-based ion source, the brightness … volume. We explore the dynamics of this transport in a 7Li magneto-optical trap ion source (MOTIS) by …

Neutron Diffraction Study of Macrostress and Microstress in Al-Al 2 O 3 -Based Corrosion Protection Coating Obtained by Cold Spray (Dynamic Metallization)

August 1, 2020
Author(s)
V. Luzin, P. Spiridonov, K. Spencer, Thomas H. Gnaupel-Herold
… cold spray variant. A series of samples approximately 1mm in thickness were sprayed with changing parameters of the … of the feedstock powders (Al, Zn, Al2O3). This resulted in MMCs of different phase compositions and slightly … the through-thickness residual stresses that accumulate in coatings during the spray process were studied using …

Energy-Efficient SWIPT-Empowered D2D ModeSelection

April 16, 2020
Author(s)
Hamid Gharavi
… most cost-effective way to address the interference issue in Device-to-Device (D2D) communications, existing works have … without consideration of the energy depletion of devices. In this paper we investigate simultaneous wireless … and ergodic capacity of D2D and cellular users in reuse, dedicated, and cellular communication modes with …

Practical Guide for Inelastic Mean Free Paths, Effective Attenuation Lengths, Mean Escape Depths, and Information Depths in X-ray Photoelectron SpectroscopyInformation Depths in X-ray Photoelectron Spectroscopy

February 20, 2020
Author(s)
Cedric J. Powell
… on four terms that are used for different purposes in X-ray photoelectron spectroscopy (XPS): the inelastic mean … both on the IMFP and on the instrumental configuration. In addition, different EALs can be defined for different XPS … is one of a series intended to highlight best practices in the use of XPS. …

Characterization of bubbler performance for low-volatility liquid precursor delivery

June 27, 2019
Author(s)
James E. Maslar, William A. Kimes, Brent A. Sperling, Ravindra K. Kanjolia
… and modeled CCTBA flow rates was obtained using a model in which a constant CCTBA partial pressure in the bubbler head space for a given bubbler temperature was assumed and in which the pressure drop between the bubbler head space and … Journal of Vacuum Science & Technology A …

Practical Guides for X-Ray Photoelectron Spectroscopy: First Steps in Planning, Conducting, and Reporting XPS Measurements

May 15, 2019
Author(s)
Cedric J. Powell, Donald R. Baer, Kateryna Artyushkova, Christopher R. Brundle, James E. Castle, Mark Engelhard, Karen Gaskell, John Grant, Richard Haasch, Matthew Linford, Peter Sherwood, Vincent Smentkowski, Alexander Shard
… decades, the use of x-ray photoelectron spectroscopy (XPS) in research and applications has grown to make XPS the most … of surface analysis. There has also been an increase in the number of new or inexperienced users along with an increase in erroneous and misapplications of the method. This article …

Measured relationship between thermodynamic pressure and refractivity for six candidate gases in laser barometry

April 15, 2019
Author(s)
Patrick F. Egan, Jack Stone, Julia K. Scherschligt, Allan Harvey
… are approaching accuracy levels where gas pressures in the range 1 Pa < p < 1 MPa inferred by measurements of gas … a relative standard uncertainty within 16 x 10^-6 * A_R. In these experiments, pressure is realized via measurements … This feature allowed us to calibrate a pressure transducer in situ with helium, and subsequently use the transducer to …

Numerical study of geometrical effects on the performance of an H-type cylindrical resonant photoacoustic cell

July 30, 2018
Author(s)
Mannoor Madhusoodanan, Jeeseong C. Hwang, Sangmo Kang
… performing simulations on the generation of acoustic waves in the cell. Here, the acoustic response (pressure), … addition due to the laser passage and thus the variations in the velocity, pressure and temperature fields inside the … of the cell for the best acoustic response. The approach in this study may be applied to the design of various types …

Quantum-based vacuum metrology at NIST

June 20, 2018
Author(s)
Julia K. Scherschligt, James A. Fedchak, Zeeshan Ahmed, Daniel S. Barker, Kevin O. Douglass, Stephen P. Eckel, Edward T. Hanson, Jay H. Hendricks, Thomas P. Purdy, Jacob E. Ricker, Robinjeet Singh
… The measurement science in realizing and disseminating the SI unit for pressure, the … spectroscopy. Work is ongoing to recast the pascal in terms of quantum properties and fundamental constants and in so doing, make vacuum metrology consistent with the global …

In situ infrared spectroscopy during La2O3 ALD using La(iPrCp)3 and H2O

April 26, 2018
Author(s)
Brent A. Sperling, James E. Maslar, Sergei Ivanov
… At low temperature, ligand exchange is seen to occur. In addition, carbonates are found. With extended purging, the … Journal of Vacuum Science and Technology A … In situ infrared spectroscopy during La2O3 ALD using …

Vacuum Furnace for Degassing Stainless-Steel Vacuum Components

March 1, 2018
Author(s)
James A. Fedchak, Julia K. Scherschligt, Daniel S. Barker, Stephen P. Eckel, Alex P. Farrell, Makfir Sefa
… outgassing rates to achieve pressure of 10-6 Pa and below. In such a case, any component placed into the ultra-high … to reduce the outgassing rate of vacuum components for use in ultra-high vacuum systems. The design, construction, and … Journal of Vacuum Science and Technology A …

Performance Analysis of Relay-based Two-way D2D Communications with Network Coding

January 23, 2018
Author(s)
Hamid Gharavi
… In this paper, we present an analytical approach to evaluate … D2D communications with and without network coding. In our approach, we first establish a relationship between … a useful insight into the application of network coding in relay-based D2D networks. … IEEE Transactions on Vehicular Technology …

Investigations of medium-temperature bakes to achieve low outgassing rates in stainless steel ultra-high vacuum chambers

July 1, 2017
Author(s)
Makfir Sefa, James A. Fedchak, Julia Scherschligt
… a medium temperature air-bake. Both heat treatments were in the range of 400 °C to 450 °C. The air-bake was performed … was performed with the interior surfaces of the components in high-vacuum, but the exterior surfaces exposed to the … A third identical vacuum chamber was constructed and baked in dry air at 250 °C for 48 hours. Compared to identical …

A method to extrapolate the diffuse upwelling radiance attenuation coefficient to the surface as applied to the Marine Optical Buoy (MOBY)

June 30, 2017
Author(s)
Kenneth Voss, Howard Gordon, Stephanie J. Flora, B. Carol Johnson, Mark A. Yarbrough, Michael Feinholz, Terrance Houlihan
… The upwelling radiance attenuation coefficient (KLu) in the upper 10 m of the water column can be significantly … will be used to provide additional more accurate products in the MOBY data set. … Journal of Atmospheric and Oceanic Technology …

Literature review on field study of ventilation and indoor air quality performance verification in high- performance commercial buildings in North America

March 31, 2017
Author(s)
Steven Emmerich, Kevin Y. Teichman, Andrew Persily
… In this paper, we summarize the results of field studies to … the ventilation and indoor air quality (IAQ) performance in high-performance commercial (non-industrial, non-residential) buildings in North America. We show that the number of such studies is … Science and Technology for the Built Environment …

Materials Design for Biomechanical Layer Structures

February 19, 2017
Author(s)
Brian R. Lawn, Antonia Pajares, P Miranda, Y N. Deng
… A survey of recent advances in the analysis of ceramic-based layer structures for … Encyclopedia of Materials: Science & Technology …

Band Alignment Measurement by Internal Photoemission Spectroscopy

January 30, 2017
Author(s)
Nhan V. Nguyen
… measurement without complicated modeling commonly used in other techniques. In this chapter, the basic principle of the internal … transport, and escape of charge carriers) are described in details. An instruction to a special case of hole emission … Metrology and Diagnostic Technology for Nanoelectronics …
Displaying 5476 - 5500 of 13218
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