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Displaying 16101 - 16125 of 73892

Near-theoretical fracture strengths in native and oxidized silicon nanowires

June 21, 2016
Author(s)
Frank W. DelRio, Ryan M. White, Sergiy Krylyuk, Albert Davydov, Lawrence H. Friedman, Robert F. Cook
In this letter, fracture strengths σf of native and oxidized silicon nanowires (SiNWs) were determined via atomic force microscopy bending experiments and nonlinear finite element analysis. In the native SiNWs, σf in the Si was comparable to the

Atomic structural evolution during the reduction of a-Fe2O3 nanowires

June 20, 2016
Author(s)
Wenhui Zhu, Jonathan P. Winterstein, Itai Maimon, Qiyue Yin, Lu Yuan, Aleksey N. Kolmogorov, Renu Sharma, Guangwen Zhou
The atomic-scale reduction mechanism of α-Fe2O3 nanowires by H2 was followed using transmission electron microscopy to reveal the evolution of atomic structures and the associated transformation pathways for different iron oxides. The reduction commences

Evolution of Dendrimer Conformational Structure with Generation Number

June 20, 2016
Author(s)
Beatriz A. Pazmino, Jack F. Douglas
We simulate the conformational structure of a coarse-grained model of dendrimer molecules in good solvent as a function of generation number G and find that they evolve through a substantially more complex structures than regular star polymer with

Kondo Effect in Magnetic Tunnel Junctions with an AIOx Tunnel Barrier

June 17, 2016
Author(s)
Chao Zheng, Robert D. Shull, Andrew P. Chen, Philip Pong
The Kondo effect in magnetic tunnel junctions (MTJs) is a result of the spin-exchange interaction between magnetic impurities and the conduction electrons. The presence of the Kondo effect can strongly influence the spin-dependent transport behavior of

Microresonator Brillouin laser stabilization using a microfabricated rubidium cell

June 17, 2016
Author(s)
William Loh, Matthew T. Hummon, Holly Leopardi, Tara Fortier, Franklyn Quinlan, John Kitching, Scott Papp, Scott Diddams
We frequency stabilize the output of a miniature stimulated Brillouin scattering (SBS) laser to rubidium atoms in a microfabricated cell to realize a laser system with frequency stability at the 10-11 level over seven decades in averaging time. In addition

Hydrodynamic Radius Fluctuations in Model DNA-Grafted Nanoparticles

June 16, 2016
Author(s)
Luis Fernando Vargas Lara, Francis W. Starr, Jack F. Douglas
We utilize molecular dynamics simulations (MD) and the path-integration program ZENO to quantify hydrodynamic radius (Rh) fluctuations of spherical symmetric gold nanoparticles (NPs) decorated with single-stranded DNA chains (ssDNA). In particular, we

Neutron Polarization Analysis for Biphasic Solvent Extraction Systems

June 16, 2016
Author(s)
Ryuhei Motokawa, Hitoshi Endo, Michihiro Nagao, William T. Heller
We performed neutron polarization analysis (NPA) of extracted organic phases containing complexes, comprised of Zr(NO 3( 4 and tri-n-butyl phosphate (TBP), to decompose the intensity distribution of small-angle neutron scattering (SANS) into the coherent

Thermoelectric properties of monolayer armchair MoS2 nanoribbons

June 16, 2016
Author(s)
Abbas Arab, Albert Davydov, Dimitrios A. Papaconstantopoulos, Qiliang Li
First-principle calculations have been performed to study thermoelectric properties of monolayer armchair nanoribbons. Structures have been relaxed to minimize force and stress before any calculation. Density functional theory using non-equilibrium Green’s

Contact resistance and phase slips in mesoscopic superfluid atom transport

June 15, 2016
Author(s)
Stephen Eckel, Jeffrey Lee, Fred Jendrejewski, Christopher Lobb, Gretchen K. Campbell, Wendell Hill
We have experimentally measured both resistive flow and superflow with bosonic atoms in a mesoscopic transport experiment. Our system, consisting of two Bose-Einstein condensates coupled by a narrow channel, shows resistive flow for currents above a

Continuous-feed optical sorting of aerosol particles

June 15, 2016
Author(s)
John J. Curry, Zachary H. Levine
We consider the problem of sorting, by size, spherical particles of order 100 nm radius. The scheme we analyze consists of a heterogeneous stream of spherical particles flowing at an oblique angle across a Gaussian mode optical standing wave. Sorting is

Efficient and Robust Optimization for building energy simulation

June 15, 2016
Author(s)
Shokouh Pourarian, Jin Wen, Anthony J. Kearsley, Amanda Pertzborn
Efficiently, robustly and accurately solving large sets of structured, non-linear algebraic and differential equations is one of the most computationally expensive steps in the dynamic simulation of building energy systems. Here, the efficiency, robustness

Framework for Standardization of Simulation Integrated Production Planning

June 15, 2016
Author(s)
Deogratias Kibira, Guodong Shao, Bjoern J. Johansson
Production planning is a complex problem that is typically decomposed into decisions carried out at different control levels. Production planning methods employed often assume a static environment; therefore, the plans developed may not be feasible if shop

Low Helium Permeation Cells for Atomic Microsystems Technology

June 15, 2016
Author(s)
Argyrios Dellis, Shah Vishal, Elizabeth A. Donley, Svenja A. Knappe, John E. Kitching
The miniaturization of instruments and sensors based on laser-cooled atoms is hindered by the large pumps needed to maintain the vacuum requirements. A significant source of vacuum contamination is the permeation of gases through the walls of the chamber

Quantum spin dynamics and entanglement generation with hundreds of trapped ions

June 15, 2016
Author(s)
Justin G. Bohnet, Brian C. Sawyer, Joseph W. Britton, Michael L. Wall, A M. Rey, Michael S. Foss-Feig, John J. Bollinger
Quantum simulation of spin models can provide insights into a variety of hard problems, including the competition between entanglement and decoherence in open quantum systems. Trapped ions are an established platform for quantum simulation, but only
Displaying 16101 - 16125 of 73892
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