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Displaying 13826 - 13850 of 73929

Role of Rheology in Achieving Successful Concrete Performance

June 1, 2017
Author(s)
Chiara F. Ferraris
Workability is one of the most important properties of concrete as it determines how easily the material can be placed. Workability affects many aspects of a concrete construction, including productivity (e.g. casting rate), processing (e.g. finishing)

Short Time and Structural Dynamics in Polypropylene Glycol Nanocomposite

June 1, 2017
Author(s)
Madhusudan Tyagi, R. Casalini, C. M. Roland
The dynamics of polypropylene glycol, both neat and attached to silica nanoparticles, were investigated using elastic neutron backscattering and dielectric spectroscopy. The mean square displacement measured by the former is suppressed by the particles at

Void-based Assembly of Colloidal Crystals

June 1, 2017
Author(s)
Nathan Mahynski, Lorenzo Rovigatti, Christos Likos, Athanassios Panagiotopoulos
We have used computer simulations to reveal how colloidal crystals may be assembled by engineering the shape and charge of polymeric additives, which act as structure-directing agents (SDAs). Using these agents, only a single desired polymorph may be

Channel Modeling and Performance of Zigbee Radios in an Industrial Environment

May 31, 2017
Author(s)
Mehrdad Damsaz, Derek Guo, Jeff Peil, Wayne Stark, Nader Moayeri, Rick Candell
In this paper we describe measurements of wireless propagation characteristics to develop path loss models in industrial environments. The models for path loss we develop are two-slope models in which the path loss is a piecewise linear relation with the

Comprehensive circuit model of auto-limiting superconductor devices and systems

May 31, 2017
Author(s)
Jordi Mateu, C Collado, A Hueltes, D Garcia-Pastor, R Perera, Nikhil M. Joshi, Xifeng Lu, Nate Orloff, Jim Booth
This paper presents a phenomenological equivalent circuit to model the phenomenon occurring when a section of superconducting transmission line transits from the superconductor to the normal state. This phenomenon allows the use of superconductors for the

Gapped Excitations in the High-Pressure Antiferromagnetic Phase of URu 2 Si 2

May 31, 2017
Author(s)
T. J. Williams, H. Barath, Z. Yamani, Jose Rodriguez Rivera, Juscelino Leao, J. D. Garrett, G. M. Luke, W.J. L. Buyers, Collin L. Broholm
We report a neutron scattering study of the magnetic excitation spectrum in each of the three temperature and pressure phases of URu 2Si 2. We find qualitatively similar excitations throughout the (H0L)scattering plane in the hidden order and large moment

Phase Diagram of a-RuCl 3 in an In-Plane Magnetic Field

May 31, 2017
Author(s)
J. A. Sears, Yang Zhao, Zhijun Xu, Jeffrey W. Lynn, Young-June Kim
The low-temperature magnetic phases in the layered honeycomb lattice material α-RuCl 3 have been studied as a function of in-plane magnetic field. In zero field this material orders magnetically below 7 K with so-called zigzag order within the honeycomb

Temperature and Radiation Effects at the Fluorine K-edge in LiF

May 30, 2017
Author(s)
Craig P. Schwartz, Francisco Ponce, Stephan Friedrich, Stephen P. Cramer, John Vinson, David Prendergast
The F K-edge of LiF is studied both experimentally and theoretically as a function of temperature. Instantaneous thermal fluctuations in atomic positions are shown in molecular dynamics simulations to increase in amplitude from 0.029 - 0.064 Å in the

A bottom-up approach for traceable nano dimensional metrology

May 29, 2017
Author(s)
Gaoliang Dai, Jens Fluegge, Harald Bosse, Ronald G. Dixson
This paper presents a bottom-up approach which uses the transmission electron microscopy (TEM) and the reference value of the crystal silicon lattice constant as a pathway for traceability to the SI metre for applications in dimensional nanometrology

An On/Off Berry Phase Switching with Circular Graphene Resonators

May 26, 2017
Author(s)
Fereshte Ghahari Kermani, Daniel T. Walkup, Christopher Gutierrez, Joaquin R. Nieva, Yue Y. Zhao, Jonathan E. Wyrick, Donat F. Natterer, William G. Cullen, Kenji Watanabe, Takashi Taniguchi, Leonid Levitov, Nikolai B. Zhitenev, Joseph A. Stroscio
Berry phase is an example of anholonomy, where the phase of a quantum state may not return to its original value after its parameters cycle around a closed path; instead the quantum system’s wavefunction may acquire a real measurable phase difference

Interacting nanoscale magnetic cluster arrays in molybdenum oxide bronzes

May 26, 2017
Author(s)
Joseph A. Hagmann, Son T. Le, Lynn F. Schneemeyer, Joseph A. Stroscio, Tiglet Besara, Theo Siegrist, Curt A. Richter, David G. Seiler
In this study, we examine several reduced ternary molybdates in the family of rare earth molybdenum bronzes produced by electrochemical synthesis with composition LnMo16O44. These compounds contain an array of electrically isolated but magnetically

Morphological characterization of fullerene and fullerene-free organic photovoltaics by combined real and reciprocal space techniques

May 26, 2017
Author(s)
Donglin Zhao, Qinghe Wu, Luping Yu, Harald Ade, Dean DeLongchamp, Lee J. Richter, Subhrangsu Mukherjee, Andrew Herzing
Morphology can play a critical role in determining function in organic photovoltaic (OPV) systems. Recently molecular acceptors have showed promise to replace¬ fullerene derivatives as acceptor materials in bulk heterojunction solar cells and have achieved
Displaying 13826 - 13850 of 73929
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