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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

Nanobolometer with ultralow noise equivalent power

October 11, 2019

Author(s)

Roope J. Kokkoniemi, Joonas Govenius, Visa Vesterinen, Russell Lake, A M. Gunyho, K-Y Tan, S Simbierowicz, Leif Gronberg, J Lehtinen, M Prunnila, Juha Hassel, Antti Lamminen, O P. Saira, Mikko Mottonen

Since the introduction of bolometers more than a century ago, they have been used in various applications ranging from chemical sensors, consumer electronics, and security to particle physics and astronomy. However, faster bolometers with lower noise are

A wide-bandwidth, high-power radio-frequency driver for acousto-optic and electro-optic devices

August 6, 2019

Author(s)

Daniel S. Barker, Neal C. Pisenti, Alessandro Restelli, Julia K. Scherschligt, James A. Fedchak, Gretchen K. Campbell, Stephen P. Eckel

… W over a 10 MHz to 1.1 GHz frequency range, and > 5W from 20 MHz to 100 MHz. The amplifiers are protected from damage …

Report for Dedicated JPSS VIIRS Ocean Color Calibration/Validation Cruise May 2018

May 31, 2019

Author(s)

Michael Ondrusek, Veronica P. Lance, Menghua Wang, Eric Stengel, Charles Kovach, Robert Arnone, Sherwin Ladner, Wesley Goode, Ahmed El-Habashi, Carlos Carrizo, Eder Herrera, Sam Ahmed, Joaquim I. Goes, Helga de Rosario Gomes, Kali McKee, Chuanmin Hu, Jennifer Cannizzaro, Yingjun Zhang, Chih-Wei Huang, David English, B. Carol Johnson, Zhongping Lee, Xiaolong Yu, Zhehai Shang, Nicholas Tufillaro, Ivan Lalovic, Kenneth Voss

… Suomi National Polar-orbiting Partnership (SNPP) and NOAA-20 satellites and the follow-on JPSS missions. The second …

BABAR: Black Array of Broadband Absolute Radiometers for far infrared sensing

May 13, 2019

Author(s)

Christopher S. Yung, Nathan A. Tomlin, Cameron Straatsma, Joel Rutkowski, Erik Richard, Dave Harber, John H. Lehman, Michelle S. Stephens

… sensing range of the imaging array into the far infrared (20 100 µm), we are replacing the cavity with a single …

Miniature fiber optic acoustic pressure sensors with air-backed graphene diaphragms

March 25, 2019

Author(s)

Douglas A. Olson, Haijun H. Liu, Zhijian Zhang, Yongyao Chen, Wen Zhongshan, Yu Miao, Hyungdae Bae, Qian Dong

… composite diaphragm exhibits a large natural frequency of 20 kHz and a large damping ratio of 0.79, both of which …

A Rydberg Atom-Based Mixer: Measuring the Phase of a Radio Frequency Wave

March 18, 2019

Author(s)

Christopher L. Holloway, Matthew T. Simons, Abdulaziz H. Haddab, Joshua A. Gordon

… Rydberg atoms as a mixer to down- convert an RF field at 20 GHz to an intermediate frequency on the order of kHz. The …

Comparison of Neutronics Performance Characteristics of the Proposed NIST Reactor with Different LEU Fuels

June 1, 2018

Author(s)

Danyal J Turkoglu, Zeyun Wu, Robert E. Williams, Thomas Henderson Newton

… for each fuel based on a 30 day reactor cycle at 20 MW power. With its very high U density, the potential to …

The Ninth Industrial Fluid Properties Simulation Challenge

May 1, 2018

Author(s)

Jonathan D. Moore, Raymond D. Mountain, Richard B. Ross, Vincent K. Shen, Daniel Siderius, Kenneth D. Smith

… predictions varied among the entries between approximately 20 % and 70 % of the total points possible with the entries …

Nanoconfinement-Induced Phase Segregation of Binary Benzene-Cyclohexane Solutions within a Chemically Inert Matrix

April 12, 2018

Author(s)

Kathryn Krycka, Joseph A. Dura, II Langston, Christopher M. Burba

… binary solution comprised of 80% mole fraction benzene and 20% mole fraction cyclohexane solution confined within SiO 2 …

Evaluated Rate Constants for i-Butane + H and CH3: Shock Tube Experiments with Bayesian Model Optimization

March 7, 2018

Author(s)

Laura A. Mertens, Iftikhar A. Awan, Jeffrey A. Manion

The reactions of i-butane with CH3 and H were investigated with shock tube experiments (870 K to 1130 K and 140 kPa to 360 kPa). Propene and i-butene, measured with GC/FID and MS, were quantified as characteristic of H-abstraction from the primary and

MCMLpar and MCSLinv: A Parallel Version of MCML and an Inverse Monte Carlo Algorithm to Calculate Optical Scattering Parameters

October 20, 2017

Author(s)

Richelle H. Streater, Anne-Michelle R. Lieberson, Adam L. Pintar, Zachary H. Levine

… in multi-layered tissues has been widely used in the past 20 years or so. Here, we have re-implemented MCML for solving …

Development of Multilayer Analyzer Array Detectors for X-Ray Fluorescence at the Third Generation Synchrotron Source

February 19, 2017

Author(s)

K Zhang, G Rosenbaum, R Liu, G Bunker, C Y. Liu, Daniel A. Fischer

… the detector in this energy region (1.5-3.6 KeV) is from 20 to 30%. These results demonstrated the feasibility for …

Measuring the Usability and Security of Permuted Passwords on Mobile Platforms

April 25, 2016

Author(s)

Kristen K. Greene, John M. Kelsey, Joshua M. Franklin

… we conducted across passwords ranging in length from 5 to 20 characters. …

Molecular Alignment and Rashba Splitting in Organometal Halide Perovskite CH3NH3PbI3 Absorbers

December 16, 2015

Author(s)

Junwen Li, Paul M. Haney

… in power conversion efficiency, reaching more than 20% within 5 years. Despite this rapid progress, there remain …

Low noise kinetic inductance traveling-wave amplifier using three-wave mixing

October 1, 2015

Author(s)

Michael R. Vissers, Robert P. Erickson, Leila R. Vale, Xian Wu, Gene C. Hilton, David P. Pappas

… amplifiers, these devices operate with the RF pump at ~20 dB lower power and at frequencies far from the signal. …

Metal-Dielectric-Metal Resonators with Deep Subwavelength Dielectric Layers Increase the Near-Field SEIRA Enhancement

September 24, 2015

Author(s)

Jungseok Chae, Basudev Lahiri, John M. Kohoutek, Glenn Holland, Henri Lezec, Andrea Centrone

… the quality factor of the plasmon excitation by ≈ 20 % and the SEIRA enhancement by ≈ 44 % with respect to …

Dense nanoimprinted silicon nanowire arrays with passivated axial p-i-n junctions for photovoltaic applications

March 31, 2015

Author(s)

Peng Zhang, Pei Liu, A. Zaslavsky, D. Pacifici, Jong Y. Ha, Sergiy Krylyuk, Albert Davydov

… Measured specular and total reflectance values of 6% and 20%, respectively, indicate strong light scattering and …

Imaging the p-n junction in a gallium nitride nanowire with a scanning microwave microscope

July 2, 2014

Author(s)

Atif A. Imtiaz, Thomas M. Wallis, Joel C. Weber, Kevin J. Coakley, Matthew D. Brubaker, Paul T. Blanchard, Kristine A. Bertness, Norman A. Sanford

… ≈1×1018 cm-3 (Mg). The AFM-SMM operated in the range of 120 GHz. The quantity d((S_11))⁄dV, which is the derivative …

Optimizing Hybrid Metrology through a Consistent Multi-Tool Parameter Set and Uncertainty Model

April 14, 2014

Author(s)

Richard M. Silver, Bryan Barnes, Nien F. Zhang, Hui Zhou, Andras Vladar, John S. Villarrubia, Regis J. Kline, Daniel Sunday, Alok Vaid

… using SEM, CDAFM and Optical CD methods applied to sub-20 nm dense feature sets. We will show reduced measurement …

Quantification of Calcium Dipicolinate in Bacillus Anthracis Spores Using a Beetroot Pigment

September 3, 2013

Author(s)

Paul C. DeRose, Sandra M. Da Silva, Let?a C. Gon?ves, Erick L. Bastos, R?o A. Ando

In this proof-of-concept study, we describe the use of the main red beet pigment betanin for the detection of bacterial spores, including Bacillus anthracis. In the presence of europium(III) ions, betanin is converted to a water-soluble, non-luminescent

Frequency-agile, rapid scanning spectroscopy: absorption sensitivity of 2*10-12 cm-1 Hz-1/2 with an external-cavity diode laser

August 3, 2013

Author(s)

David A. Long, Gar Wing Truong, Roger D. van Zee, David F. Plusquellic, Joseph T. Hodges

… an electro-optic phase modulator with a bandwidth of 20 GHz generates pairs of sidebands on the probe laser. The … and a noise-equivalent absorption coefficient of 1.7×10-12 cm-1 Hz-1/2. By comparison to cavity-enhanced laser …

Oxidatively Induced Damage to DNA: Potential Role of Single-Wall Carbon Nanotubes at the Molecular Level

May 13, 2013

Author(s)

Elijah J. Petersen, Xiaomin X. Tu, M Miral Dizdar, Ming Zheng, Bryant C. Nelson

… Here, we investigated DNA base damage in (ATT)14 and (GT)20 oligomers from ultrasonication in the presence and absence …

Extending single-photon optimized superconducting transition edge sensors beyond the single-photon counting regime

October 2, 2012

Author(s)

Thomas Gerrits, Brice R. Calkins, Nathan A. Tomlin, Adriana E. Lita, Alan L. Migdall, Richard P. Mirin, Sae Woo Nam

… edge sensors resolve photon number of up to 10 or 20 photons, depending on the wavelength and TES design. We …

Anisotropic frequency response of spin-torque oscillators with applied field polarity and direction

September 4, 2012

Author(s)

Matthew R. Pufall, William H. Rippard, Stephen E. Russek, Eric R. Evarts

We have measured spin-torque-driven oscillations of Ni80Fe20 free-layer nanocontacts as a function of field direction. For a given field axis angle (10◦ from the surface normal) and magnitude, simply changing the field polarity can significantly alter the

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