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Search Publications

NIST Authors in Bold

Displaying 9701 - 9725 of 73697

Singular Angular Magnetoresistance in a Magnetic Nodal Semimetal

June 26, 2019
Author(s)
T. Suzuki, L. Savary, J.-P. Liu, Jeffrey W. Lynn, L. Balents, J. G. Checkelsky
Transport coefficients are incisive experimental probes of the low energy, long wavelength properties of correlated electron systems often useful for mapping hidden phases with distinct symmetries. Here we report a new transport signature of spontaneous

Competing Polar and Antipolar Structures in the Ruddlesden-Popper Layered Perovskite Li 2 SrNb 2 O 7

June 25, 2019
Author(s)
Ritesh Uppuluri, Hirofumi Akamatsu, Arnab Sen Gupta, Huaiyu Wang, Craig Brown, Kleyser E. Agueda Lopez, Nasim Alem, Venkatraman Gopalan, Thomas E. Mallouk
Over the past few years, several studies have reported the existence of polar phase in n=2 Ruddlesden-Popper layer perovskites by trilinear coupling of oxygen octahedral rotations (OOR) and polar distortions, a phenomenon termed as hybrid improper

Considerations for Managing Internet of Things (IoT) Cybersecurity and Privacy Risks

June 25, 2019
Author(s)
Katie Boeckl, Michael Fagan, Bill Fisher, Naomi Lefkovitz, Katerina N. Megas, Ellen M. Nadeau, Benjamin M. Piccarreta, Danna G. O'Rourke, Karen A. Scarfone
The Internet of Things (IoT) is a rapidly evolving and expanding collection of diverse technologies that interact with the physical world. Many organizations are not necessarily aware of the large number of IoT devices they are already using and how IoT

Short-Range Charge Density Wave Order in TaS2

June 25, 2019
Author(s)
Jaydeep D. Joshi, Heather M. Hill, Sugata Chowdhury, Christos D. Malliakas, Francesca M. Tavazza, Utpal Chatterjee, Angela R. Hight Walker, Patrick M. Vora
2H-TaS2 undergoes a charge density wave (CDW) transition at T_CDW ~ 75 K, however key questions regarding the onset of CDW order remain under debate. In this study, we explore the CDW transition through a combination of temperature and excitation-dependent

Assessing form-dependent optical scattering at vacuum- and extreme-ultraviolet wavelengths off nanostructures with two-dimensional periodicity

June 24, 2019
Author(s)
Bryan M. Barnes, Mark Alexander Henn, Martin Y. Sohn, Hui Zhou, Richard M. Silver
Several metamaterials and nanostructures are form birefringent, exhibiting effective refractive index differences for orthogonal polarizations due to the placement of subwavelength features if the periodicity is smaller than the incident wavelength. As the

Chemical Identification of Interlayer Contaminants within van der Waals Heterostructures

June 24, 2019
Author(s)
Jeffrey Schwartz, ?Hsun-Jen Chuang, Matthew R. Rosenberger, Saujan V. Sivaram, Kathleen M. McCreary, B.T. Jonker, Andrea Centrone
Van der Waals heterostructures (vdWHs) leverage the characteristics of two-dimensional (2D) material building blocks to create a myriad of structures with unique and desirable properties. Several commonly employed fabrication strategies rely on polymeric

Effects of Field Annealing on MnN/CoFeB Exchange Bias Systems

June 24, 2019
Author(s)
Patrick A Quarterman, I. Hallsteinsen, M. Dunz, M. Meinert, E. Arenholz, Julie A. Borchers, Alexander J. Grutter
We report the effects of nitrogen diffusion on exchange bias in MnN/CoFeB heterostructures as a function of MnN thickness and field annealing temperature. We find that competing effects occur in which high-temperature annealing enhances exchange bias in

Efficient telecom-to-visible spectral translation through ultra-low power nonlinear nanophotonics

June 24, 2019
Author(s)
Xiyuan Lu, Gregory Moille, Qing Li, Daron Westly, Anshuman Singh, Ashutosh Rao, Su P. Yu, Travis Briles, Scott Papp, Kartik Srinivasan
The ability to spectrally translate lightwave signals in a compact, low-power platform is at the heart of the promise of nonlinear nanophotonic technologies. For example, a device to connect the telecommunications band with visible and short near-infrared

Intrinsic spin currents in ferromagnets

June 24, 2019
Author(s)
Vivek P. Amin, Junwen Li, Mark D. Stiles, Paul M. Haney
First principles calculations show that electric fields applied to ferromagnets generate spin currents flowing perpendicularly to the electric field. Reduced symmetry in these ferromagnets enables a wide variety of such spin currents. However, the total

Nail to Nail Fingerprint Challenge: Enrollment Set Size Variability

June 24, 2019
Author(s)
Gregory P. Fiumara, Kenneth Ko, Elham Tabassi, Patricia A. Flanagan, John D. Grantham, Karen Marshall, Matthew Schwarz, Bryan Woodgate
In September 2017, the Intelligence Advanced Research Projects Activity held a fingerprint data collection as part of the Nail to Nail Fingerprint Challenge. Thousands of latent fingerprint images collected at the Challenge were searched against rolled

pyMCR: A Python Library for Multivariate Curve Resolution Analysis

June 24, 2019
Author(s)
Charles H. Camp
In this work, a new software library is presented for performing multivariate curve resolution (MCR)analysis, a chemometric method for elucidating signatures of analytes ("endmember extraction") and their relative abundance (regression) from a series of

Optimization of Air-to-Refrigerant Evaporator with Low-GWP Refrigerants

June 23, 2019
Author(s)
Piotr A. Domanski
An analytical evaluation of the performance of low-GWP refrigerants in a finned-tube evaporator used for residential cooling applications will be presented. The study employed an evolutionary-computation optimization module to examine the effect of a

A Truth-Matrix View into Unary Computing

June 22, 2019
Author(s)
Advait Madhavan, Georgios Tzimpragos, Mark D. Stiles, Timothy Sherwood
Our community has been exploring Time-of-arrival based codes as a candidate for very low energy information processing. A ``space-time'' algebra has been recently proposed that captures the essential features of such a paradigm. In order to gain some

Effect of Adjacent Hydrophilic Polymer Thin Films on Physical Aging and Residual Stress in Thin Films of Poly(butylnorbornene-ran-hydroxyhexafluoroisopropyl norbornene)

June 22, 2019
Author(s)
Elizabeth A. Lewis, Christopher Stafford, Bryan D. Vogt
The properties of thin supported polymer films can be dramatically impacted by the substrate upon which it resides. A simple way to alter the properties of the substrate (chemistry, rigidity, dynamics) is by coating it with an immiscible polymer. Here we

An Implementation Proposal for IEEE 802.11ay SU/MU-MIMO Communication in ns-3

June 21, 2019
Author(s)
Hany Assasa, Joerg Widmer, Jian Wang, Tanguy Ropitault, Nada T. Golmie
Wireless communications in the millimeter-wave band bring unprecedented capabilities to achieve wireline performance in wireless networks and alleviate the congestion problem of current wireless technologies. However, efficient wireless networking in this

Analysis of Different Computational Techniques for Calculating the Polarizability Tensors of Stem Cells with Realistic Three-Dimensional Morphologies

June 21, 2019
Author(s)
Edward Garboczi, Jack Douglas, Beatriz Pazmino, Ahmed M. Hassan, Somen Baidya
Recent advances in synthetic biomaterial microenvironment design has enabled researchers to mimic the natural in vivo environment of the cell and, therefore, quantify the effect of the environment on the morphologies of stem cells. Recently, the National
Displaying 9701 - 9725 of 73697
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