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NIST Authors in Bold

Displaying 801 - 825 of 4633

Improved thermal-vacuum compatible flat plate radiometric source for system-level testing of optical sensors

September 15, 2015
Author(s)
Steven W. Brown, Mark A. Schwarz, Craig J. Kent, Robert Bousquet
… the development of an improved vacuum compatible flat plate radiometric source used for characterizing and … situ, throughout their testing period. The original flat plate radiometric source was developed for use by the VIIRS … Improved thermal-vacuum compatible flat plate radiometric source for system-level testing of optical …

Method to Determine Collection Efficiency of Particles by Swipe Sampling

September 1, 2008
Author(s)
Jennifer R. Verkouteren, Jessica L. Staymates, Robert A. Fletcher, Wayne Smith, George A. Klouda, John G. Gillen
… explosives and contraband at screening checkpoints using Ion Mobility Spectrometry (IMS). Collection efficiencies were … to particle size and mode of deposition, collection trap, surface type, and swiping force. Test surfaces … Of the two IMS collection traps studied, the PTFE trap has significantly lower collection efficiencies. This is …

Calibration of a Spectral Responsivity Transfer Standard

October 16, 2008
Author(s)
George P. Eppeldauer, Leonard Hanssen
… (UV) and infrared (IR). The transmission of the gold-black coated LiNbO 3 pyroelectric material is negligibly … The reference device for absolute calibraton was a Si trap-detector calibrated against the primary standard … absolute responsivity, gold-black coating, infrared, irradiance, pyroelectric …

Spectral Responsivity Determination of a Transfer-Standard Pyroelectric Radiometer

December 1, 2002
Author(s)
George P. Eppeldauer, J Racz, Leonard M. Hanssen
… (UV) and infrared (IR). The transmission of the gold-black coated LiNbO 3 pyroelectric material is negligibly … The reference device for absolute calibraton was a Si trap-detector calibrated against the primary standard … absolute responsivity, gold-black coating, infrared, irradiance, pyroelectric …

Spectral Responsivity Determination of a Transfer-Standard Pyroelectric Radiometer

May 1, 2002
Author(s)
J Racz, George P. Eppeldauer
… (UV) and infrared (IR). The transmission of the gold-black coated LiNbO 3 pyroelectric material is negligibly … The reference device for absolute calibraton was a Si trap-detector calibrated against the primary standard … absolute responsivity, gold-black coating, infrared, irradiance, pyroelectric …

Study of Direct Lithiation of Thin Si Membranes with Spatially-Correlative Low Energy Focused Li Ion Beam and Analytical Electron Microscopy Techniques

November 22, 2016
Author(s)
Vladimir P. Oleshko, Christopher L. Soles, Kevin A. Twedt, J J. McClelland
… Si is an attractive anode material for high-performance Li-ion batteries. The practical use of Si-based anodes is, … these problems. Here, we report on controlled low dose Li+ ion implantation into 9 nm-thick amorphous (a-Si) membranes … (c-Si) membranes using a low-energy focused lithium ion beam. With probe sizes of a few tens of nanometers at …

Measuring the Ion Current in High-Density Plasmas Using Radio-Frequency Current and Voltage Measurements

September 1, 2001
Author(s)
Mark A. Sobolewski
… methods have recently been proposed for monitoring the ion current in situ. These methods rely on passive, … by comparison to direct, independent measurements of the ion current at the substrate electrode made using lower … more accurate numerical sheath model, gives values of the ion current in agreement with the independent measurements. …

Detection of the BCS Transition of a Trapped Fermi-Gas

October 1, 2000
Author(s)
G M. Bruun, Charles W. Clark
… We investigate theoretically the properties of a trapped gas of fermionic atoms both in the normal and the … results are directly relevant to ongoing experiments on trapped Fermi gases. … Detection of the BCS Transition of a Trapped Fermi-Gas …

Ion-beam radiation damage to DNA by investigation of free radical formation and base damage

March 1, 2020
Author(s)
Melis Kant, Pawel Jaruga, Erdem Coskun, Samuel Ward, Alexander Stark, David Becker, Amitav Adhikary, Michael Sevilla, Miral M. Dizdar
… processes and DNA base products involved in Ne-22 ion- beam (ca. 1.4 GeV) radiation damage to hydrated (12 … x 1 mm) samples were stacked in a sample packet and then ion-beam irradiated at 77 K. Free radicals trapped in ion- beam irradiated DNA at 77 K were elucidated using ESR …

High Precision Measurements of Arsenic Implantation Dose in Silicon by Secondary Ion Mass Spectrometry

February 1, 2001
Author(s)
P Chi, David S. Simons, J M. McKinley, F A. Stevie, C N. Granger
… to be accomplished with low systematic error. Secondary ion mass spectrometry (SIMS) has a demonstrated capability to … investigated include arsenic analytical species, matrix ion species, energy bandpass, and sample holder design. With … profile, energy distribution, high precision measurement, ion implantation, SIMS …

Ne-22 Ion-Beam Radiation Damage to DNA: From Initial Free Radical Formation to Resulting DNA-Base Damage

June 14, 2021
Author(s)
Melis Kant, Pawel Jaruga, Erdem Coskun, Samuel Ward, Alexander Stark, Thomas Baumann, David Becker, Amitava Adhikary, Michael Sevilla, Miral M. Dizdar
… processes and the products of DNA damage involved in Ne-22 ion-beam radiation of hydrated (12±3 H2O/nucleotide) salmon … showed that, as the linear energy transfer (LET) of the ion-beam radiation increases along the beam track, the … Bragg peak is reached. Yields of DNA products along the ion-beam track were in excellent agree-ment with the radical …

ELSEPA - Dirac Partial-Wave Calculation of Elastic Scattering of Electrons and Positrons by Atoms, Positive Ions and Molecules

January 1, 2005
Author(s)
Francesc Salvat, Aleksander Jablonski, Cedric J. Powell
… scattering of electrons and positrons by atoms, postive ions and molecules is presented. These codes perform … a local central interaction potential V (r). For atoms and ions, the static-field approximation is adopted, with the … atoms, elastic scattering, electrons, molecules, positive ions, positrons …

High Quality Oxide Films Deposited at Room Temperature by Ion Beam Sputtering

February 5, 2018
Author(s)
Gerard E. Henein, Juraj Topolancik, Kerry NMN Siebein
… SiO2, Al2O3 and ITO have been deposited via ion beam sputtering at room temperature. The SiO2 films, 100 … Ion beam sputtering, resistivity, breakdown, SiO2, Al2O3, ITO … High Quality Oxide Films Deposited at Room Temperature by Ion Beam Sputtering …

MEMS Parallel Plate Rheometer for Oscillatory Shear Micro Rheology Measurements

December 11, 2009
Author(s)
Gordon Christopher, Nicholas G. Dagalakis, Steven D. Hudson, Kalman D. Migler
… a fluid s micro structure. We demonstrate a MEMs parallel plate rheometer for micro rheology that confines viscoelastic … response to dynamic oscillatory shear. The MEMs Parallel Plate rheometer uses a 1 mm square nano positioner stage to … the gap between the stage and a transparent cover plate that allows optical observation. By decreasing this …

Fracture Toughness Tests at 77 K and 4 K on 316L Stainless Steel Welded Plates

July 29, 2022
Author(s)
Jake Benzing, Nicholas Derimow, Enrico Lucon, Dash Weeks
… from the centers of four 316L welded stainless steel plates, each produced by a different vendor. Although the plates were produced in accordance with the same … Tests at 77 K and 4 K on 316L Stainless Steel Welded Plates …

On Lamb Modes as a Function of Acoustic Emission Source Rise Time

January 1, 2010
Author(s)
Marvin A. Hamstad
A study was carried out to examine Lamb-wave modal content as a function of the acoustic emission (AE) source rise time. The study used a validated finite element code to model the source operation and subsequent wave propagation up to a distance of 480 mm

Mobilities: Small Systems

October 12, 2021
Author(s)
J Husband, S R. Leone
… gas. From these studies much has been learned about the ion-neutral interaction potential. Knowledge of how an ion travels through a neutral gas is crucial to the … are essential for accurate modeling of the kinetics of ion-molecule reactions. Such reactions play a major role in …

Formation of SEI on Cycled Lithium-Ion Battery Cathodes: Soft X-ray Absorption Study

January 1, 2002
Author(s)
Mahalingam Balasubramanian, H S. Lee, X Sun, Xiao-Qing Yang, A R. Moodenbaugh, James McBreen, Daniel A. Fischer, Ziwen Fu
… (SEI) on LiNi 0.85 Co 0.15 O 2 cathodes from lithium-ion cells cycled at 40EC and 70EC was observed and … battery, electrolyte, lithium-ion, soft x-ray … Formation of SEI on Cycled Lithium-Ion Battery Cathodes: Soft X-ray Absorption Study …

Recent atomic clock comparisions at NIST

October 1, 2008
Author(s)
Luca Lorini, Neil Ashby, Anders Brusch, Scott Diddams, Robert E. Drullinger, Eric Eason, Tara Fortier, Pat Hastings, Thomas P. Heavner, David Hume, Wayne M. Itano, Steven R. Jefferts, Nathan R. Newbury, Tom Parker, Till P. Rosenband, Jason Stalnaker, William C. Swann, David J. Wineland, James C. Bergquist
… measurements of the absolute frequency of the Hg + single-ion optical clock (using the cesium primary frequency …
Displaying 801 - 825 of 4633
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