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Search Publications

NIST Authors in Bold

Displaying 6376 - 6400 of 74096

Dielectric loss extraction for superconducting microwave resonators

May 5, 2020
Author(s)
Corey Rae H. McRae, Russell Lake, Junling Long, Mustafa Bal, Xian Wu, Battogtokh Jugdersuren, Thomas Metcalf, Xiao Liu, David P. Pappas
The investigation of two-level-state (TLS) loss in dielectric materials and interfaces remains at the forefront of materials research in superconducting quantum circuits. We demonstrate a method of TLS loss extraction of a thin film dielectric by measuring

Wavelength Standards

May 5, 2020
Author(s)
Alexander Kramida
The concept of wavelength standards is briefly explained on an undergraduate student level, and a guide to their current values and sources is given

Nanopore sequencing and the Shasta toolkit enable efficient de novo assembly of eleven human genomes

May 4, 2020
Author(s)
Justin M. Zook, Kishwar Shafin, Trevor Pesout, Ryan Lorig-Roach, Marina Haukness, Hugh E. Olsen, Miten Jain, Benedict Paten
De novo assembly of a human genome using nanopore long-read sequences has been reported, but it used more than 150,000 CPU hours and weeks of wall-clock time. To enable rapid human genome assembly, we present Shasta, a de novo long-read assembler, and

Readily Accessible Benzo[d]thiazole Polymers for Nonfullerene Solar Cells with > 16% Efficiency and Potential Pitfalls

May 4, 2020
Author(s)
Liang-Wen Feng, Jianhua Chen, Subhrangsu Mukherjee, Yao Chen, Ding Zheng, Joseph Strzalka, Gang Wang, Dean DeLongchamp, Antonio Facchetti, Tobin Marks
Here we report facile, high-yield synthetic access to the difluoro BTA building block, 4,7-bis(5-bromo-4-(2-hexyl-decyl)-thiophen-2-yl)-5,6-difluoro-2-(pentadecan-7-yl)-benzo[d]thiazole (BTAT-2f), for use in donor (D)–acceptor 1 (A1)–D–acceptor 2 (A2)

Recommendation for Key Management: Part 1 - General

May 4, 2020
Author(s)
Elaine B. Barker
This Recommendation provides cryptographic key-management guidance. It consists of three parts. Part 1 (this document) provides general guidance and best practices for the management of cryptographic keying material, including definitions of the security

The Characteristics of a 1 m Methanol Pool Fire

May 4, 2020
Author(s)
Kunhyuk Sung, Jian Chen, Matthew Bundy, Anthony Hamins
A series of measurements was made to characterize the structure of a 1 m diameter methyl 12 alcohol (methanol; CH3OH) pool fire steadily burning with a constant lip height in a quiescent 13 environment. Time-averaged local measurements of gas-phase

Tuning interfacial Dzyaloshinskii-Moriya interactions in thin amorphous ferrimagnetic alloys

May 4, 2020
Author(s)
Yassine Quessab, Jun-Wen Xu, Chung Ting Ma, W. Zhou, Grant A. Riley, Justin Shaw, Hans Nembach, S. J. Poon, Andrew D. Kent
Skyrmions can be stabilized in magnetic systems with broken inversion symmetry and chiral interactions, such as Dzyaloshinskii-Moriya interactions (DMI). Further, compensation of magnetic moments in ferrimagnetic materials can significantly reduce magnetic

Determining Flow Resistance through Vegetation Canopy

May 2, 2020
Author(s)
Ryan L. Falkenstein-Smith, Kevin B. McGrattan
This study documents the measurement of the wind resistance of different types of vegetation. The measurements are made in a wind tunnel with a 2.0 m test section and 0.5 m by 0.5 m cross- section. Samples of vegetation have been cut into cubical volumes

Accurate Integral Counting Using Multi-channel Analyzers

May 1, 2020
Author(s)
Ryan P. Fitzgerald, Lynne E. King
Many techniques in radionuclide metrology rely on accurate measurement of the total count rate, that is integral counting, from a detector. In modern experiments, this can be achieved by integrating the total number of counts in an energy spectrum produced

AlGaN/GaN core-shell heterostructures for nanowire UV LEDs

May 1, 2020
Author(s)
Matthew D. Brubaker, Bryan T. Spann, Kristen L. Genter, Alexana Roshko, Paul T. Blanchard, Todd E. Harvey, Kristine A. Bertness
Nanowire-based ultraviolet (UV) LEDs hold great promise as nanoscale light sources, potentially enabling advanced scanning microscopy probes capable of optoelectronic sensing and near-field scanning photolithography. In this work, we report on the

All-fiber frequency comb at 2 mm providing 1.4-cycle pulses

May 1, 2020
Author(s)
Sida Xing, Abijith S. Kowligy, Daniel Lesko, Alexander Lind, Scott Diddams
We report an all-fiber approach to generating sub-2-cycle pulses at 2 µm and a corresponding octave-spanning optical frequency comb. Our configuration leverages mature erbium:fiber laser technology at 1.5 µm to provide a seed pulse for a thulium-doped
Displaying 6376 - 6400 of 74096