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Displaying 5701 - 5725 of 73927

Mechanical Quantum Sensing in the Search for Dark Matter

August 13, 2020
Author(s)
Jacob Taylor, Gadi Afek, Sunil Bhave, Daniel Carney, Gordan Krnjaic, David Moore, Robinjeet Singh, Cindy Regal, Benjamin M. Brubaker, Andrew Geraci, Jonathan D. Cripe, Sohitri Ghosh, Jack Harris, Anson Hook, Jonathan Kunjummen, Rafael Lang, Li Tongcang, Tongyan Lin, Zhen Liu, Joseph Lykken, Lorenzo Magrini, Jack Manley, Nobuyuki Matsumoto, Alissa Monte, Fernando Monteiro, Thomas Purdy, C. J. Riedel, Swati Singh, Kanupriya Sinha, Juehang Qin, Dalziel Wilson, Yue Zhao
Numerous astrophysical and cosmological observations are best explained by the existence of dark matter, a mass density which interacts only very weakly with visible, baryonic matter. Searching for the extremely weak signals produced by this dark matter

Polycyclic Aromatic Hydrocarbon Structure Index

August 12, 2020
Author(s)
Lane C. Sander, Stephen A. Wise
NIST Special Publication (SP) 922 is an aid in the identification of the chemical structures of polycyclic aromatic hydrocarbons (PAHs). The Structure Index consists of two parts: (1) a cross index of named PAHs listed in alphabetical order and (2)

Termination Switching of Antiferromagnetic Proximity Effect in Topological Insulator

August 12, 2020
Author(s)
Chao-Yao Yang, Lei Pan, Alexander Grutter, Haiying Wang, Xiaoyu Che, Qing L. He, Yingying Wu, Dustin A. Gilbert, Padraic Shafer, Elke Arenholz, Hao Wu, Gen Yin, Peng Deng, Julie Borchers, William D. Ratcliff, Kang L. Wang
The magnetic proximity effect (MPE) allows exchange-coupling of topological insulators (TIs) with magnetically ordered materials to break time-reversal-symmetry and open a gap in the Dirac-cone surface state, with the goal of realizing quantum anomalous

The Impact and Fate of Graphene Oxide in Graphene Oxide/Polymer Nanocomposites Exposed to Ultraviolet Irradiation

August 11, 2020
Author(s)
David G. Goodwin, Trinny Lai, Yadong Lyu, Chen Yuan Lu, Alejandro Campos, Vytautas Reipa, Tinh Nguyen, Li Piin Sung
Ultraviolet (UV) radiation, heat and moisture can lead to polymer degradation outdoors but the effect of graphene oxide (GO) nanofiller incorporation on this process is unknown. Since GO can improve the mechanical, barrier, and thermal properties of a

Towards Measurement of Advanced Mobile Manipulator Performance for Assembly Applications

August 11, 2020
Author(s)
Roger V. Bostelman, YaShian Li-Baboud, Soocheol Yoon, Mili Shah, Omar Y. Aboul-Enein
Advanced mobile manipulators offer the manufacturing industry the potential of a highly flexible system to perform precision assembly tasks where the environment and the system are subject to uncertainties. Developing precision performance measurement

Physical Models and Dimensional Traceability of WR15 Rectangular Waveguide Standards for Determining Systematic Uncertainties of Calibrated Scattering-Parameters

August 10, 2020
Author(s)
Jeffrey A. Jargon, Dylan F. Williams, Angela C. Stelson, Christian J. Long, Aaron M. Hagerstrom, Paul D. Hale, John R. Stoup, Eric S. Stanfield, Wei Ren
In this report, we document the models and dimensional traceability of our WR15 rectangular waveguide standards for performing multiline thru-reflect-line calibrations from 50 GHz to 75 GHz using vector network analyzers. We identify the equations used in

Zero Trust Architecture

August 10, 2020
Author(s)
Scott W. Rose, Oliver Borchert, Stuart Mitchell, Sean Connelly
Zero trust (ZT) is the term for an evolving set of cybersecurity paradigms that move defenses from static, network- based perimeters to focus on users, assets, and resources. A zero trust architecture (ZTA) uses zero trust principles to plan industrial and

Low-loss Metasurface Optics down to the Deep Ultraviolet

August 9, 2020
Author(s)
Cheng Zhang, Shawn M. Divitt, Qingbin Fan, Wenqi Zhu, Amit Agrawal, Yanqing Lu, Ting Xu, Henri Lezec
Metasurfaces, planar arrays of subwavelength electromagnetic structures that collectively mimic the functionality of much thicker conventional optical elements, have been demonstrated at frequencies ranging from the microwave up to the visible. Here, we

Proteomics in non-model organisms: a new analytical frontier

August 9, 2020
Author(s)
Michelle Heck, Ben Neely
For the last century we have relied on model organisms to help understand fundamental biological processes. Now, with advancements in genome sequencing, assembly and annotation, non-model organisms may be studied with the same advanced bioanalytical

Uncertainty of Large-Signal Measurements Under Variable Load Conditions

August 8, 2020
Author(s)
Konstanty Lukasik, Jerome Cheron, Gustavo Avolio, Arkadiusz Lewandowski, Dylan Williams, Wojciech Waitr, Dominique Schreurs
We thoroughly investigate the uncertainty of large-signal measurements when load conditions at the fundamental frequency change. In particular, we evaluate uncertainties of the incident a2 and scattered b2 frequency-domain spectra. They are of particular

A miniaturized optical frequency standard for next generation portable optical clocks

August 7, 2020
Author(s)
Vincent N. Maurice, Zachary Newman, Susannah Dickerson, Morgan Rivers, Mark Mescher, John LeBlanc, John Kitching, Matthew Hummon, Cort Johnson
This paper describes the development and measurement of a miniaturized optical frequency standard based on the rubidium two-photon transition at 778 nm. The optical standard has been implemented on a micro-optics breadboard and operates on

Elucidating Charge Transport Mechanisms in Graphene Inks

August 7, 2020
Author(s)
Ana C. de Moraes1, Jan Obrzut, Vinod K. Sangwan, Julia R. Downing, Lindsay E. Chaney, Dinesh K. Patel, Randolph Elmquist, Mark C. Hersam
Solution-processed graphene inks using ethyl cellulose polymer as a binder/stabilizer were blade-coated into large area films. Systematic charge transport characterization showed graphene patterns with high mobility ( 160 cm2 V-1 s-1), low energy gap

The Concentration Dependence of the Size and Symmetry of a Bottlebrush Polymer in a Good Solvent

August 7, 2020
Author(s)
Daniel F. Sunday, Alexandros Chremos, Tyler B. Martin, Alice B. Chang, Adam B. Burns, Robert H. Grubbs
Bottlebrush polymers consist of a linear backbone with densely grafted sidechains which impact the rigidity of the molecule. The persistence length of the bottlebrush backbone in solution is influenced by both the intrinsic structure of the polymer and by

Magnetic Properties of (Fe 1-x Mn x ) 2 AlB 2 and the Impact of Substitution on the Magnetocaloric Effect

August 6, 2020
Author(s)
D. Potashnikov, Elad Nisan NMN Caspi, A. Pesach, S. Kota, M. Sokol, L. A. Hanner, M. W. Barsoum, Hayden Evans, A. Eyal, A. Keren, O. Rivin
In this work, we investigate the magnetic structures of (Fe 1−x Mn x ) 2 AlB 2 solid-solution quaternaries in the x = 0 to 1 range using X-ray and neutron diffraction, magnetization measurements, and mean field theory calculations. While Fe 2 AlB 2 and Mn

An untargeted approach to determine the authenticity of Ginkgo biloba L. plant materials and dried leaf extracts by liquid chromatography-mass spectrometry (LC-HRMS) and chemometrics.

August 5, 2020
Author(s)
Meryl B. Cruz, Benjamin Place, Laura J. Wood, Aaron A. Urbas, Werickson Rocha, Andrzej Wasik
The lack of stringent regulations regarding raw materials for herbal supplements used for medicinal purposes has been a constant challenge in the industry. Ginkgo biloba L. leaf extracts attract consumers because of the supposed positive effect on mental
Displaying 5701 - 5725 of 73927