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Displaying 13926 - 13950 of 73929

Coherent quantum frequency bridge: phase preserving, nearly-noiseless parametric frequency converter

May 3, 2017
Author(s)
Ivan A. Burenkov, Yu-Hsiang Cheng, Tim O. Thomay, Glenn S. Solomon, Alan L. Migdall, Thomas Gerrits, Adriana E. Lita, Sae Woo Nam, Lynden K. Shalm, Sergey V. Polyakov
We characterize an efficient and nearly-noiseless parametric frequency upconverter. The ultra- low noise regime is reached by the wide spectral separation between the input and pump frequencies and the low pump frequency relative to the input photons. The

Fully-Stabilized All Polarization-Maintaining Fiber Erbium Frequency Comb

May 3, 2017
Author(s)
Laura C. Sinclair, Ian R. Coddington, William C. Swann, Kana Iwakuni, Nathan R. Newbury
We demonstrate a completely polarization-maintaining fiber frequency comb operating at a 200 MHz repetition rate and show stability and noise performance consistent with precision measurement applications. This design is compatible with a robust, fieldable

Kinetic theory of dark solitons with tunable friction

May 3, 2017
Author(s)
Ian B. Spielman, Hilary Hurst, Victor Galitski
We study controllable friction in a system consisting of a dark soliton in a one-dimensional Bose- Einstein condensate coupled to a non-interacting Fermi gas. The fermions act as impurity atoms, not part of the original condensate, that scatter off of the

Static and dynamic magnetic properties of sputtered Fe-Ga thin films

May 3, 2017
Author(s)
Daniel B. Gopman, Vimal Sampath, Hasnain Ahmad, Supriyo Bandyopadhyay, Jayasimha Atulasimha
We present measurements of the static and dynamic properties of iron-gallium films, ranging from 20~nm to 80~nm and sputtered from an $\mathrm{Fe_{0.8}Ga_{0.2}}$ target. Using a broadband ferromagnetic resonance setup in a wide frequency range

Dynamic Metrology and ASTM E57.02 Dynamic Measurement Standard

May 2, 2017
Author(s)
Roger V. Bostelman, Tsai H. Hong, Steven A. Legowik, Mili Shah
Optical tracking systems are used in a wide range of fields. The market for optical tracking systems has dramatically increased over the past several years to $1.2B revenue in 2014. This paper describes the new ASTM E3064 Standard test method procedures

Full statistical mode reconstruction of a light field via a photon-number resolved measurement

May 2, 2017
Author(s)
Ivan A. Burenkov, Sergey V. Polyakov, Thomas Gerrits, Timothy J. Bartley, Georg Harder, Christine Silberhorn, Ankita Sharma, Elizabeth A. Goldschmidt
We present a method to reconstruct the mode structure and optical losses of multimode conjugated optical fields using an experimentally measured joint photon-number probability distribution. We demonstrate nearly-perfect reconstruction of a multimode field

High-brightness Cs focused ion beam from a cold-atomic-beam ion source

May 2, 2017
Author(s)
Adam V. Steele, Andrew Schwarzkopf, Jabez J. McClelland, Brenton Knuffman
We present measurements of focal spot size and brightness in a focused ion beam system utilizing a laser-cooled atomic beam source of Cs ions. Spot sizes as small as (2.1 ± 0.2) nm (one standard deviation) and brightness values as high as (1.3 ± 0.1) x 107

3-Port Frequency Selective Absorptive Limiter

May 1, 2017
Author(s)
A Hueltes, Eduard Rocas, Carlos Collado, Jordi Mateu, D Garcia-Pastor, James Booth, Rafael P. Robles
This paper proposes a novel 3-port absorptive limiter for frequency selective circuits based on a similar configuration than a conventional 90º hybrid coupler. This circuit uses the switching features existing in common diode devices to changes between the

Behavior of post-installed anchors tested by stepwise increasing cyclic crack protocols

May 1, 2017
Author(s)
Christoph Mahrenholtz, Rolf Eligehausen, Tara C. Hutchinson, Matthew Hoehler
The American Concrete Institute (ACI) standards for qualification of post-installed concrete anchors (ACI 355.2 and ACI 355.4) include a nonseismic crack movement test characterized by a large number of small-amplitude crack cycles. This paper investigates

Bose-Einstein Condensates in Artificial Gauge Fields

May 1, 2017
Author(s)
Ian B. Spielman, Lindsay LeBlanc
Quantum mechanically, static or applied gauge fields manifest themselves by directly coupling to a system's phase. Artificial gauge field techniques manipulate the phase of a Bose-Einstein condensates's order parameter, yielding effects present in

Comparing the Usability of Cryptographic APIs

May 1, 2017
Author(s)
Yasemin Acar, Michael Backes, Sascha Fahl, Simson L. Garfinkel, Doowon Kim, Michelle L. Mazurek, Christian Stransky
Potentially dangerous cryptography errors are well-documented in many applications. Conventional wisdom suggests that many of these errors are caused by cryptographic Application Programmer Interfaces (APIs) that are too complicated, have insecure defaults

Direct evidence of atomic-scale structural fluctuations in catalyst nanoparticles

May 1, 2017
Author(s)
Pin Ann Lin, Jose Gomez-Ballesteros, Juan Burgos, Perla Balbuena, Bharath N. Natarajan, Renu Sharma
A heterogeneous catalyst usually works by letting the reactant adsorb onto its surface where the energies for specific bonds to dissociate and/or combine with other species (to form desired intermediate or final products) are lower. Rational catalyst

Dynamic Appliances Scheduling in Collaborative MicroGrids System

May 1, 2017
Author(s)
Hamid Gharavi, Hasnae Bilil
Abstract—In this paper a new approach which is based on a collaborative system of MicroGrids (MG’s), is proposed to enable household appliance scheduling. To achieve this, appliances are categorized into flexible and non-flexible Deferrable Loads (DL’s)

Energy Efficiency Challenges of 5G Small Cell Networks

May 1, 2017
Author(s)
Hamid Gharavi
The deployment of a large number of small cells poses new challenges to energy efficiency, which has often been ignored in fifth generation (5G) cellular networks. While massive multiple-input multiple outputs (MIMO) will reduce the transmission power at

Enzyme-Lignin Binding Variation in Commercial Cellulase Preparations Bind Differently to Dioxane Extracted Lignins

May 1, 2017
Author(s)
John M. Yarbrough, Ashutosh Mittal, Elisabeth Mansfield, Larry Taylor, Stephen R. Decker, Michael E. Himmel, Todd B. Vinzant
Commercial fungal cellulases used in biomass-to-biofuels processes can be grouped into three general classes: native, augmented, and engineered. Colorimetric assays for general glycosyl hydrolase activities showed distinct differences in enzyme binding to
Displaying 13926 - 13950 of 73929
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