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Displaying 17476 - 17500 of 74666

Two Volt Josephson Arbitrary Waveform Synthesizer Using Wilkinson Dividers

February 19, 2016
Author(s)
Nathan E. Flowers-Jacobs, Anna E. Fox, Paul D. Dresselhaus, Robert E. Schwall, Samuel P. Benz
The root-mean-square (rms) output voltage of the NIST Josephson arbitrary waveform synthesizer (JAWS) has been doubled from 1 V to a record 2 V by combining two new 1 V chips on a cryocooler. This higher voltage will improve calibrations of ac thermal

Vertical 2D/3D Semiconductor Heterostructures based on Epitaxial Molybdenum Disulfide and Gallium Nitride

February 19, 2016
Author(s)
Dmitry A. Ruzmetov, Kehao Zhang, Gheorghe Stan, Berc Kalanyan, Ganesh R. Bhimanapati, Sarah M. Eichfeld, R A. Burke, Pankaj B. Shah, Terrance P. O'Regan, Frank J. Crowne, A. Glen Birdwell, Joshua A. Robinson, Albert Davydov, Tony G. Ivanov
When designing semiconductor heterostructures, it is expected that epitaxial alignment will facilitate low-defect interfaces and efficient vertical transport. Here, we report lattice-matched epitaxial growth of molybdenum disulfide (MoSub2) directly on

Development of a Northern Continental Air Standard Reference Material

February 18, 2016
Author(s)
George C. Rhoderick, Duane Kitzis, Michael E. Kelley, Walter R. Miller Jr., Bradley Hall, Edward Dlugokencky, Pieter Tans, Antonio M. Possolo, Jennifer Carney
The National Institute of Standards and Technology (NIST) recently began to develop standard mixtures of greenhouse gases as part of a broad program mandated by the 2009 United States Congress to support research in climate change. To this end, NIST made

Mitigating Ingredient Variability Risks with Smart Manufacturing

February 18, 2016
Author(s)
Frank H. Riddick, Evan K. Wallace, Jim Davis
Managing the design of products and the efficient execution of the manufacturing processes needed to produce them is an endeavor fraught with all manner of risks for manufacturing enterprises large and small. In certain industries, such as the food

Assessing Electron Backscattered Diffraction and Confocal Raman Microscopy Strain Mapping Using Wedge-indented Si

February 17, 2016
Author(s)
Lawrence Henry Friedman, Mark D. Vaudin, Stephan J. Stranick, Gheorghe Stan, Yvonne B. Gerbig, William Alexander Osborn, Robert F. Cook
The accuracy of electron backscattered diffraction (EBSD) and confocal Raman microscopy (CRM) for small-scale strain mapping are assessed using the multi-axial strain field surrounding a wedge indentation in Si as a test vehicle. The strain field is

Gas Sensing with Bare and Graphene-covered Optical Nano Antenna Structures

February 17, 2016
Author(s)
Bhaven Mehta, Kurt D. Benkstein, Stephen Semancik, Mona E. Zaghloul
The motivation behind this work is to study the gas phase chemical sensing characteristics of optical (plasmonic) nano antennas (ONA) and graphene/graphene oxide-covered versions of these structures. ONA are devices that have their resonating frequency in

Implementing Trusted Geolocation Services in the Cloud

February 17, 2016
Author(s)
Michael J. Bartock, Karen Scarfone, Larry Feldman
The bulletin summarizes the information presented in NISTIR 7904, "Trusted Geolocation in the Cloud: Proof of Concept Implementation". The publication explains security challenges involving Infrastructure as a Service (IaaS) cloud computing technologies

Improved Catalytic Activity and Stability of Palladium Pincer Complex by Incorporation into a Metal-Organic Framework

February 17, 2016
Author(s)
Samantha A. Burgess, Abebu Kassie, Sarah A. Baranowski, Keith J. Fritzsching, Klaus Schmidt-Rohr, Craig Brown, Casey R. Wade
A porous metal-organic framework Zr 6O 4(OH) 4(L-PdX) 3 (1-x) has been constructed from Pd diphosphinite pincer complexes ([L-PdX} 4 = [1,3-(OPAr 2) 2C 6H 3)PdX] 4-, Ar = p-C 6H 4CO 2, X = Cl, I). Reaction of 1-X with Phi(O 2CCF 3) 2 generates 1-TFA, which

Langasite-Type Resonant Sensors for Harsh Environments

February 16, 2016
Author(s)
Yuriy Suhak, Michal Schulz, Hendrik Wulfmeier, Ward Johnson, Andrei Sotnikov, Hagen Schmidt, Steffen Ganschow, Detlef Klimm, Holger Fritze
Operation of single crystalline Ca3TaGa3Si2O14 (CTGS) and La3Ga5SiO14 (LGS) bulk acoustic wave resonators is demonstrated up to 1270 °C and 1470 °C, respectively. The mass sensitivity of such devices is about 35 cm^2Hz/ug at 800 °C. Therefore, they are

Portable high-accuracy non-absorbing laser power measurement at kilowatt levels by means of radiation pressure

February 16, 2016
Author(s)
Paul A. Williams, Joshua A. Hadler, Frank C. Maring, Robert Lee, Kyle A. Rogers, Brian J. Simonds, Matthew T. Spidell, Ari D. Feldman, John H. Lehman
We describe a unique optical power meter which measures the radiation pressure to accurately determine a laser’s optical power output. This approach traces its calibration of the optical Watt to the kilogram. Our power meter is designed for high-accuracy

The lifetime of 4p54d levels in highly ionized atoms

February 16, 2016
Author(s)
G. Gaigalas, P. Rynkun, Charlotte F. Fischer
Energy levels, lifetimes, and wave function compositions have been computed for all atomic states of the 4p6 and 4p54d configurations using a single-reference (SR) configuration state along with single- and double-substitutions (SD) to generate expansions

Experimental dynamic trapping of electrostatically actuated bistable micro-beams

February 15, 2016
Author(s)
Lior Medina, Rivka Gilat, Robert Ilic, Slava Krylov
We demonstrate dynamic snap-through from a primary to a secondary statically inaccessible stable configuration in single crystal silicon, curved, doubly clamped micromechanical beam structures. Nanoscale motion of the fabricated bistable micromechanical

Near-field control and imaging of free charge carrier variations in GaN nanowires

February 15, 2016
Author(s)
Samuel Berweger, Paul T. Blanchard, Matthew Brubaker, Kevin J. Coakley, Norman A. Sanford, Thomas Mitchell (Mitch) Wallis, Kris A. Bertness, Pavel Kabos
Despite their uniform crystallinity, the shape and faceting of semiconducting nanowires (NWs) can give rise to variations in structure and associated electronic properties. Here we investigate local variations in electronic structure across individual n

An Overview of Spectral Imaging of Human Skin toward Face Recognition

February 13, 2016
Author(s)
David Allen
Spectral imaging is a form of remote sensing that provides a means of collecting information from surroundings without physical contact. Differences in spectral reflectance over the electromagnetic spectrum allow for the detection, classification, or

Optical system design for femtosecond-level synchronization of clocks

February 13, 2016
Author(s)
Laura C. Sinclair, William C. Swann, Jean-Daniel Deschenes, Hugo Bergeron, Fabrizio R. Giorgetta, Esther Baumann, Michael A. Cermak, Ian R. Coddington, Nathan R. Newbury
Synchronization of optical clocks via optical two-way time-frequency transfer across free-space links can result in time offsets between the two clocks below tens of femtoseconds over many hours. The complex optical system necessary to support such
Displaying 17476 - 17500 of 74666
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