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Displaying 13926 - 13950 of 73922

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

Guide Brief 12 Short-Term Implementation Tasks

May 1, 2017
Author(s)
Community Resilience Program NIST
This Guide Brief offers suggestions for short-term implementation tasks, as well as short-term activities, that support continual engagement during the overall planning process. Implementing short-term administrative solutions can help improve resilience
Displaying 13926 - 13950 of 73922
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