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Displaying 9976 - 10000 of 73742

Design and performance study of actively holding-off GHz-gated InGaAs/InP SPADs

May 13, 2019
Author(s)
Alessandro Restelli, Joshua C. Bienfang, Alan L. Migdall
High-speed periodic gating of InGaAs/InP single-photon avalanche diodes (SPADs) has allowed these detectors to operate at count rates above $10^8$ per second with low-afterpulsing. However, a drawback of high-speed periodic gating is that bias gates are

Designing new structures in epitaxial graphene on SiC: transport and quantum effects

May 13, 2019
Author(s)
Randolph E. Elmquist, Hanbyul Jin, Mattias Kruskopf, Martina Marzano, Dinesh K. Patel, Alireza R. Panna, Albert F. Rigosi
When epitaxial graphene (EG) grows on hexagonal SiC(0001), chemical doping is produced by bonds at the epitaxial interface, or buffer layer. Robust quantum Hall effect (QHE) plateaus are observed at RK/2 = h/2e2, where RK is a constant of electrical

High-resolution, high-contrast mid-infrared imaging of fresh biological samples with ultraviolet-localized photoacoustic microscopy

May 13, 2019
Author(s)
Junhui Shi, Terrence Wong, Yun He, Lei Li, Ruiying Zhang, Christopher Yung, Jeeseong C. Hwang, Lihong Wang
Mid-infrared (MIR) microscopy provides rich chemical and structural information about biological samples, without staining. Conventionally, the long MIR wavelength severely limits the lateral resolution owing to optical diffraction; moreover, the strong

Spatio-temporally resolved methane fluxes from the Los Angeles Megacity

May 13, 2019
Author(s)
Kimberly Mueller
We combine sustained observations from a network of atmospheric monitoring stations with inverse modeling to uniquely obtain (3 km, 4 day) spatio-temporal estimates of methane emissions from the Los Angeles Megacity and the broader South Coast Air Basin

High-Pressure Synthesis of Non-Stoichiometric Li x WO 3 (0.5less than or equal to}xless than or equal to}1.0) with LiNbO 3 Structure

May 12, 2019
Author(s)
Kohdai Ishida, Yuya Ikeuchi, Cedric Tassel, Hiroshi Takatsu, Craig Brown, Hiroshi Kageyama
Compounds with the LiNbO 3-type structure are important for a variety of applications such as piezoelectric sensors, while recent attention has been paid to magnetic and electronic properties. However, all the materials reported are stoichiometric. This

Noise-Synthesis Technique in Time~Domain for Metrology Application

May 11, 2019
Author(s)
Dazhen Gu, Jeffrey E. Jenkins
We developed a prototype radiometer system to implement the noise-synthesis technique. A solid- state switch synthesizes noise signals from outputs of two synchronized electromechanical switches. The input ports of electromechanical switches are terminated

Temperature and light intensity effects on the photodegradation of high-density polyethylene

May 11, 2019
Author(s)
Andrew W. Fairbrother, Hsiang C. Hsueh, Jae Hyun Kim, Deborah S. Jacobs, Lakesha N. Perry, David G. Goodwin, Christopher C. White, Stephanie S. Watson, Li Piin Sung
The photodegradation of polymers poses a serious challenge to their outdoor application, and results in significant financial loss due to early or unexpected system failure. A better understanding of their degradation kinetics aids the improvement of

Certification of Standard Reference Material 3389 Ginsenoside Calibration Solution

May 10, 2019
Author(s)
Walter B. Wilson, Lane C. Sander, Benjamin J. Place, James H. Yen
Standard Reference Material (SRM) 3389 is intended as a calibration solution for use for the determination of ginsenosides in natural matrix samples. A unit of SRM 3389 consists of two different ampule solutions: (1) four ampules of a six-component mixture

Structural Insights into DNA-Stabilized Silver Clusters

May 10, 2019
Author(s)
Danielle Schultz, Robert G. Brinson, Fahriye N. Sari, Jeffrey Fagan, Christina Bergonzo, Nancy Lin, Joy Dunkers
The structure and dynamics of Ag complexes derived from single stranded DNA (ssDNA) is less understood than their double stranded (dsDNA) counterparts despite their great promise as fluorescent biological probes and sensors. In this work, we seek new

Towards a source of entangled photon pairs in gallium phosphide

May 9, 2019
Author(s)
Paulina S. Kuo, Peter G. Schunemann, Mackenzie Van Camp, Varun B. Verma, Thomas Gerrits, Sae Woo Nam, Richard P. Mirin
We investigate parametric down-conversion in orientation-patterned GaP. Pumped at 865 nm, the signal and idler are at 1350 nm and 2400 nm, respectively.

Towards Standard Exoskeleton Test Methods for Load Handling

May 9, 2019
Author(s)
Roger V. Bostelman, Ya-Shian Li-Baboud, Ann Virts, Soocheol Yoon, Mili Shah
Exoskeletons are now being marketed by several manufacturers and yet there are currently no standard test methods to compare exoskeletons to task. The National Institute of Standards and Technology (NIST) has been a key contributor to the formation of a

Imaging topology of Hofstadter ribbons

May 8, 2019
Author(s)
Ian B. Spielman, Dina Genkina, Alina M. Pineiro Escalera, Hsin-I Lu, Lauren Aycock
Physical systems with non-trivial topological order find direct applications in metrology[1] and promise future applications in quantum computing[2,3]. The quantum Hall effect derives from transverse conductance, quantized to unprecedented precision in

Resonant acoustic nonlinearity and loss in additively manufactured stainless steel

May 8, 2019
Author(s)
Ward L. Johnson, Justin G. Whiting, Felix H. Kim, Paul R. Heyliger, Nikolas W. Hrabe
Resonant acoustic nonlinearity and loss in additively manufactured stainless steel were measured with the aim of assessing the potential of such measurements for nondestructively sensing defects that degrade mechanical performance. The material was

A NIST Testbed for Examining the Accuracy of Smart Meters under High Harmonic Waveform Loads

May 7, 2019
Author(s)
Richard L. Steiner, Michael P. Farrell, Shannon Edwards, Thomas L. Nelson, Joni Ford, Sumaiyah Sarwat
Household and industrial electrical energy measurements are advancing into a Smart Grid stage, using solid-state watthour meters with communication capability, called Smart meters. As electrical products become heavily based on solid-state designs, such as

A Reference Schema for the Unit Manufacturing Process Information Model

May 7, 2019
Author(s)
William Bernstein, David Lechevalier
This document presents supporting documentation for a reference implementation of the Unit Manufacturing Process (UMP) information model presented in ASTM E3012, Standard Guide for Characterizing Environmental Aspects of Manufacturing Processes. A version

Generating polarization-entangled photon pairs in domain-engineered PPLN

May 7, 2019
Author(s)
Paulina S. Kuo, Varun B. Verma, Thomas Gerrits, Sae Woo Nam, Richard P. Mirin
Using a periodically poled LiNbO3 crystal that is domain-engineered for two simultaneous type-II down-conversion processes, we demonstrated polarization-entangled photon-pair generation.

Integrated transition edge sensors on lithium niobate waveguides

May 7, 2019
Author(s)
Thomas Gerrits, Adriana Lita, Richard Mirin, Sae Woo Nam, Jan P. Hoepker, Stephan Krapick, Harald Herrmann, Raimund Ricken, Victor Quiring, Christine Silberhorn, Tim J. Bartley
We show the proof-of-principle detection of light at 1550 nm coupled evanescently from a lithium niobate waveguide to a superconducting transition edge sensor. The coupling efficiency strongly depends on the polarization, the overlap between the evanescent
Displaying 9976 - 10000 of 73742
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