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Search Publications

NIST Authors in Bold

Displaying 501 - 525 of 2521

Direct observation of Feshbach enhanced s-wave scattering of fermions

December 17, 2015
Author(s)
Dina Genkina, Lauren M. Aycock, Hsin I Lu, Ian B. Spielman, Benjamin K. Stuhl
… scattering cross-section of ultracold 40K atoms across the 20.2 mT Feshbach resonance by colliding pairs of degenerate … data we extracted the resonant magnetic field value B0 = 20.247(2) mT and resonance width ∆ = 1.0(1) mT. These imaging …

Ultimate bending strength of Si nanowires

April 11, 2012
Author(s)
Gheorghe Stan, Sergiy Krylyuk, Albert Davydov, Igor Levin, Robert F. Cook
… bending strengths of Si nanowires with radii in the 20 nm to 60 nm range were investigated by using a new bending … as the radius of nanowires was decreased from 60 nm to 20 nm. The large values of the fracture strength of these …

Bicubic B-Spline Surface Approximation of Invariant Tori

October 20, 2010
Author(s)
Sita Ramamurti, David E. Gilsinn
The invariant torus of a coupled system of Van der Pol oscillators is approximated using bicubic B-splines. The paper considers the case of strong nonlinear coupling. In particular, the shapes of invariant torii for the Van der Pol coupling parameter $

Frequency dependence of capacitance standards

September 1, 2003
Author(s)
Yicheng Wang
… a 10 pF transportable fused-silica capacitor from 50 Hz to 20 kHz. The results have a relative standard uncertainty of … 0.15x10^(-6), and 0.37x10(-6) at 100 Hz, 400 Hz, and 20 kHz, respectively. This will lead to improvements in the …

Measurement of the Optical Extinction Coefficients of Post-Flame Soot in the Infrared

July 1, 2003
Author(s)
J F. Widmann, Jiann C. Yang, Samuel L. Manzello, George W. Mulholland
The optical extinction coefficients of post-flame soot have been measured in the wavelength range 2.8 micrometers to 4.1 micrometers. A laminar diffusion burner was combined with an infrared spectrograph and gravimetric measurements to determine the mass

High Pressure X-Ray Crystallography With the Diamond Cell at NIST/NBS

November 1, 2001
Author(s)
Gasper J. Piermarini
Scientists in the Crystallography Section at NIST/NBS made several outstanidng contributions greatly influencing the development and advancement of high pressure x-ray crystallography during the second-half of the 20th century. These milestone achievements

Thermal-hydraulic Assessment of the Proposed NIST Neutron Source Design

October 6, 2023
Author(s)
Anil Gurgen, Abdullah Weiss, Joy Shen
To replace the ageing reactor at the NIST Center for Neutron Research, a new reactor design is proposed, namely the NIST Neutron Source or NNS. The NNS will contain a light-water moderated and cooled core that would serve as a neutron source for a state-of

FINE-TUNING ELECTRICAL FLOW RATE SENSING IN DEFORMABLE CHANNELS

October 9, 2016
Author(s)
Pengfei Niu, Brian J. Nablo, Kiran Bhadriraju, Darwin Reyes-Hernandez
Here we present conclusive proof that when using electrical impedance to measure volumetric flow rate in polydimethylsiloxane (PDMS) microchannels a considerable fraction of the change in impedance, due to change in flow rate, is caused by the variation in

Sustainability through Lifecycle Synthesis of Material Information

April 19, 2013
Author(s)
Paul W. Witherell, Katherine C. Morris, Anantha Narayanan Narayanan, Jae H. Lee, Sudarsan Rachuri
The synthesis of material information across lifecycle stages will lay the foundation for a material information model to support sustainable decision making. This paper explores how material information is represented in select standards that address

Spherical Rubidium Vapor Cells Fabricated By Micro Glass Blowing

January 21, 2007
Author(s)
E. J. Eklund, A Shkel, Svenja A. Knappe, Elizabeth A. Donley, John E. Kitching
This paper presents an application of micro glass blowing, in which multiple glass spheres are simultaneously shaped on top of a silicon wafer and subsequently filled with rubidium. The fabrication process is based on etching cavities in silicon, followed

The Influence of the Aromaticity in the Gas Chromatography Retention: The Case of Polycyclic Aromatic Sulfur Heterocycles

December 15, 2017
Author(s)
Jorge O. Ona-Ruales, Yosadara Ruiz-Morales, Fernando Alvarez-Ramirez, Walter Brent Wilson, Stephen A. Wise
The aromaticity has been used as a criterion to explain the GC retention of cata-condensed polycyclic aromatic sulfur heterocycles (PASHs) C12H8S, C16H10S, C20H12S; and peri-condensed PASHs C18H10S, in a GC column with 50% phenyl / 50% methyl silphenylene

Organosilicate Polymer E-Beam Resists with High Resolution, Sensitivity and Stability

February 28, 2013
Author(s)
Christopher Soles, Richard Kasica, Hae-Jeong Lee, Jae H. Sim, Sung-Il Lee, Ki-Bum Kim, Hyun-Mi Kim, Do Y. Yoon
… is an attractive electron-beam (e-beam) resist for sub-20 nm lithography due to its high resolution, excellent … High resolution patterns of features as small as 20 nm with excellent LER are successfully fabricated … using a 100 keV e-beam. The dose for patterning 20 nm lines is reduced from 4000 μC/cm2 for HSQ to 900 μC/cm2 …

Sensitivity Analysis of CO2 Concentrations as Ventilation Metrics

October 5, 2023
Author(s)
Oluwatobi Oke, Andrew K. Persily
… occupants, and metabolic rates) were varied by about +/- 20 % to evaluate the impact on two metric values of interest … In addition, the space ventilation rate was varied by +/- 20 % to allow comparison to the variations associated with … metric values. Varying these two parameters by +/- 20 % results in variations in the CO2 concentrations of about …

A Structural Study of Electrodeposited Fe on GaAs(001)

October 12, 2021
Author(s)
Erik B. Svedberg, J Mallett, Leonid A. Bendersky, A G. Roy, William F. Egelhoff Jr., Thomas P. Moffat
… yields films that only exhibit (001) scattering in the )-20 geometry. TEM cross sectional images of films grown in … (221) orientation that is undetectable by symmetric 0-20 diffraction. The (221) oriented material most likely …
Displaying 501 - 525 of 2521
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