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NIST Authors in Bold

Displaying 576 - 600 of 1184

Investigation and Control of Spatial Characteristics of Chamber-Cleaning Plasmas

February 1, 2001
Author(s)
Kristen L. Steffens, Mark A. Sobolewski
Planar laser-induced fluorescence (PLIF) measurements were made to determine 2-D spatial maps of CF2 density as a chemical marker of plasma uniformity in 9%O2/91%CF4 chamber-cleaning plasmas. Measurements were made in the capacitively-coupled Gaseous

Can a Pressure Standard be Based on Capacitance Measurements?

March 1, 1998
Author(s)
Michael R. Moldover
We consider the feasibility of basing a pressure standard on measurements of the dielectric constant [epsilon] and the thermodynamic temperature T of helium near )[degrees]C. The pressure P of the helium would be calculated using the fundamental constants

Spatial Resolution with Time-and-Polarization-Resolved Acoustic Microscopy

January 1, 1997
Author(s)
D Xiang, Gerald V. Blessing, Nelson N. Hsu
We have developed a time-and-polarization-resolved acoustic microscopy technique to determine material properties of solids immersed in water. At the heart of this technique is a specially designed large aperture, lensless, cylindrical PVDF transducer

Low-temperature Growth of GMR Spin Valves

January 1, 1996
Author(s)
William F. Egelhoff Jr., R Misra, T Ha, Y Kadmon, Cedric J. Powell, Mark D. Stiles, Robert McMichael, Lawrence H. Bennett, C Lin, J Sivertsen, J Judy
We have investigated the dependence of the giant magnetoresistance (GMR) effect, the coercivity, the coupling field, and the resistivity on film deposition at low-substrate temperatures (150 K) in spin valve multilayers of the general type: FeMn/Ni 80Fe 20

Assessment of Serum Total 25-Hydroxyvitamin D Assays for Vitamin D External Quality Assessment Scheme (DEQAS) Materials Distributed at Ambient and Frozen Conditions

November 9, 2021
Author(s)
Johanna Camara, Christopher T. Sempos, Emma L. Williams, Graham D. Carter, Julia C. Jones, Carolyn Burdette, Grace Hahm, Federica Nalin, David L. Duewer, Adam J. Kuszak, J. M. Betz, Andrew Hoofnagle, Pierre Lukas, E. Cavalier, Ramon Durazo-Arvizu, P. M. Crump, Christian Popp, Christian Beckert, Glen Van Slooten, Patrick Gradon, Joelle Morgand, Sarah Paul, Bruno Emanuelli, Angelo Maggio, Fiona Ivison, Ralf Fischer, Jody M. van den Ouweland, Chung S. Ho, Emmett W. Law, Jean-Nicolas Simard, Renaud Gonthier, Brett Holmquist, Manisha S. Patwardhan, Marcelo C. Batista, Heather Pham, Sarah Meadows, Eugene Jansen, Dilshad A. Khan, Kimberly Robyak, Mark Kilbane, Neil Parker, Vincent Chen, Robert Fitzgerald, Sohail Mushtaq, Michael W. Clarke, Norma Breen, Christine Simpson, Stephen A. Wise
… were found to be statistically significant at p < 0.05 for four assays (DiaSorin, DIAsource, Siemens, and SNIBE … samples were not found to be significant at p < 0.05 indicating that these analytes were stable during shipment …

Calibrating laser Doppler anemometers utilizing an optical chopper

January 31, 2025
Author(s)
Christopher Crowley, Iosif Isaakovich Shinder, Michael R. Moldover, Joey Boyd, James Filla, Aaron Johnson
Laser Doppler anemometers (LDAs) use scattered light to determine velocity components of a flowing fluid. The operating principal of LDAs is simple conceptually; however, it is impractical to trace the LDA-determined velocities to the SI by characterizing

Measuring the size of oil droplets in a flow cytometer using Mie Resonances

January 21, 2025
Author(s)
Richard E. Cavicchi, Dean Ripple, Joshua Welsh, Jerilyn Izac, Alexander Peterson, Aaron Goldfain, Wyatt Vreeland
An emulsion of silicone oil droplets in aqueous buffer produces a distinctive series of peaks or resonances in the side scatter histogram in a flow cytometer. As many as 12 peaks are observed in the violet-side scatter channel at 405 nm, with half that

Quantifying Mechanical Abrasion of AgNP Nanocomposites used in 3D Printing: Influence of AgNP content on abrasion products and rate of microplastic production

June 7, 2024
Author(s)
Joana Sipe, William Berger, Nathan Bossa, Melissa Chernick, Keana C. K. Scott, Alan Kennedy, Treye Thomas, Christine Ogilvie, Mark Wiesner
Nanomaterials are used in polymer composites to enhance plastic products' properties. Silver nanoparticles (AgNPs) are added to composites for their antimicrobial and fungicidal properties. Polyethylene terephthalate glycol polymer (PETG) AgNP composite

Modeling the linear and nonlinear dielectric response of solvents

March 13, 2023
Author(s)
Michael Woodcox, Avik Mahata, Aaron Hagerstrom, Angela Stelson, Chris Muzny, Ravishankar Sundararaman, Kathleen Schwarz
We demonstrate a method to compute the dielectric spectra of fluids in molecular dynamics by directly applying electric fields to the simulation. We obtain spectra from molecular dynamics simulations with low magnitude electric fields (0.01 V/A) in

Deep Learning Image Analysis of Nanoplasmonic Sensors: Toward Medical Breath Monitoring

November 23, 2022
Author(s)
Yangyang Zhao, Boqun Dong, Kurt D. Benkstein, Lei Chen, Kristen L. Steffens, Stephen Semancik
Sensing biomarkers in exhaled breath offers a potentially portable, cost-effective, and noninvasive strategy for disease diagnosis screening and monitoring, while high sensitivity, wide sensing range, and target specificity are critical challenges. We

Cavitation Creep in the Next Generation Silicon Nitride

October 12, 2021
Author(s)
F Lofaj, Sheldon M. Wiederhorn, Gabrielle G. Long, P R. Jemian, M Ferber
X-ray scattering (A-USAXS). Failure strains were around 0.5 %. The creep resistance of this grade was found to be up to two orders of magnitude better than that of other silicon nitrides. The corresponding stress exponents were higher than 6. Creep damage

Solidus Phase Relationships in the AO-Al 2 O 3 -Nb 2 O 5 (A = Ca, Sr) Systems

October 12, 2021
Author(s)
Julia Y. Chan, Wilma Feb-Ayala, L D. Rotter, Igor Levin, Richard G. Geyer
Dielectric ceramics for wireless communications exhibiting modest permittivity, high quality factor (Q), and near-zero temperature coefficient are needed for high frequency, high power applications. Efforts are in progress to replace Ta 2O 5-based ceramics

Effect of H 2 O Molecules on Thermal Expansion of TiCo(CN) 6

October 19, 2020
Author(s)
Qilong Gao, Xinwei Shi, Alessandro Venier, Qingzhen Huang, Hui Wu, Jun Chen, Andrea Sanson, Erjun Liang
… water in the lattice void exhibits a linear NTE (α l =-4.05×10 -6 K -1 , 100-475 K). Combined with the results of …
Displaying 576 - 600 of 1184
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