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Search Publications

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Displaying 3876 - 3900 of 74647

Mixed-Surfactants as a Novel Approach to Atomic Engineering of Spin Valves

October 12, 2021
Author(s)
D X. Yang, H D. Chopra, P J. Chen, William F. Egelhoff Jr.
Previously, surfactants in ultra-high vacuum have been used to obtain smooth interfaces in giant magnetoresistance effect (GMR) spin valves for an enhanced GMR. In the present study, a novel extension to the surfactant approach has been developed, called

Mobilities of aromatic ions drifting in helium

October 12, 2021
Author(s)
M Krishnamurthy, J A. de Gouw, V M. Bierbaum, S R. Leone
Benzene dimer cations (C 12H 12+and C 12H 11+) are produced in the flow tube section of a selected-ion flow-drift tube (SIFDT) apparatus. The reduced mobilities of these ions in helium are measured as a function of the characteristic parameter E/N (the

Mobilities: Small Systems

October 12, 2021
Author(s)
J Husband, S R. Leone
Motion of one species with respect to another is governed by their mutual interaction potential. Since ions are readily manipulated in electricfields, experimentalists since the end of the nineteenth century have been able to direct and watch the flow of

Modal Reconstruction of Aspheric Surfaces From Experimental Second Derivatives

October 12, 2021
Author(s)
Nadia Machkour-Deshayes, Byoung C. Kim, Robert S. Polvani, Ulf Griesmann
A method for the measurement of precise aspheric optical surfaces based on measurements of the second derivatives of the surface is evaluated. A compact phase-measuring interferometer is used to determine the second derivatives of a surface on a survey

Model for Dispersion Rheology

October 12, 2021
Author(s)
J Bicerano, Jack F. Douglas, D A. Brune
A general model of the viscosity of complex-shaped particle dispersions is developed based on an exact virial expansion about the low concentration limit and a mathematical analogy between the hydrodynamics of concentrated particle suspensions and the

Molecular Computers for Solving Computational Decision Problems

October 12, 2021
Author(s)
Z Amitay, R Kosloff, S R. Leone
State-selective coherent control tailored molecular wave packets is implemented for solving computational decision problems. The current study involves graphs composed of vertices and edges, and the computational task is to determine the connectivity of a

Molecular Modeling of the Thermal Decomposition of Polymers

October 12, 2021
Author(s)
S I. Stoliarov, H Zhang, P R. Westmoreland, R Lyon, Marc R. Nyden
Applications presented in this work demonstrate the potential for using quantum mechanics and molecular simulations to determine the mechanisms and rates of the thermal decomposition of polymers. The expectation is that these capabilities can be used to

Molecular Production in Two Component Atomic Fermi Gases

October 12, 2021
Author(s)
J Chwedenczuk, K Goral, T K hler, Paul S. Julienne
We provide a practical approach to the molecular production via linear downward sweeps of Feshbach resonances in degenerate Fermi gases containing incoherent mixtures of two atomic spin states. We show that the efficiency of the association of atoms is

Molecular-scale Structural and Functional Characterization of Sparsely Tethered Bilayer Membranes

October 12, 2021
Author(s)
Duncan McGillivray, Gintaras Valincius, David J. Vanderah, W Febo-Ayala, John T. Woodward IV, F Hienrich, John J. Kasianowicz, M Losche
Surface-tethered biomimetic bilayer membranes (tethered lipid bilayer membranes, tBLMs) have been formed on gold surfaces from phospholipids and a synthetic 1-thiahexa(ethy lene oxide) lipid, WC14. They have been characterized using electrochemical

Morphology Dependence of Ultrafast Emission From Metal-Dendrimer Nanocomposites

October 12, 2021
Author(s)
O Varnavski, T Goodson, F Groehn, Barry J. Bauer, Eric J. Amis
We report the results of ultra-fast fluorescence investigations from gold-dendrimer nanocomposites of different morphologies. Femtosecond depolarized emission has been detected and characterized for Polyamidoamine (PAMAM) G5-based gold colloids, which

Multi-Pole Representation of the Dielectric Matrix

October 12, 2021
Author(s)
J A. Soininen, J J. Rehr, Eric L. Shirley
A good approximation for the electron self-energy or the electron quasiparticle properties is needed for an accurate calculation of x-ray absorption spectra. The GW approximation (GWA) has been found to be relatively reliable in predicting the

Nano/Bioscience and Technology Education for the 21st Century

October 12, 2021
Author(s)
J Jacobs, Winnie Wong-Ng, Gale A. Holmes, Richard F. Kayser
NEW:Update 2005, the 20th annual workshops for science and technology educators with the theme, NANO/BIOSCIENCE AND TECHNOLOGY EDUCATION FOR THE 21ST CENTURY, was hosted by the National Institute of Standards and Technology/Materials Science and

Near-Field Intensity Correlations in Semicontinuous Metal-Dielectric Films

October 12, 2021
Author(s)
K Seal, A K. Sarychev, H Noh, D A. Genov, A Yamilov, Vladimir Shalaev, Z C. Ying, H Cao
Spatial intensity correlation functions are obtained from near-field scanning optical microscope measurements of semicontinuous metal-dielectric films. The concentration of metal particles on a dielectric surface is varied over a wide range to control the

Near-Field Second Harmonic Microscopy of Thin Ferroelectric Films

October 12, 2021
Author(s)
V Smolyaninova, H Y. Liang, C H. Lee, C C. Davis, L D. Rotter, Debra Kaiser
Near-field second harmonic microscopy is ideally suited for studies of local nonlinearity and poling of ferroelectric materials at the microscopic level. Its main advantages in comparison with other scanning probe techniques are the possibility of fast

Near-Field, Spherical-Scanning Antenna Measurements With Nonideal Probe Locations

October 12, 2021
Author(s)
Ronald C. Wittmann, Bradley Alpert, Michael H. Francis
We introduce a near-field, spherical-scanning algorithm for antenna measurements that relaxes the usual condition requiring data points to be on a regular spherical grid. Computational complexity is of the same order as for the standard (ideal-positioning)

NEMI Group Recommends 'Standardized' Lead-Free Solder Alternative

October 12, 2021
Author(s)
J Bath, C A. Handwerker, E Bradley
Increasing global concern about the environment is bringing regulatory and consumer pressure on the electronics industry in Europe and Japan to reduce or completely eliminate the use of lead in products. As Europe and Japan move toward lead-free

NEMI Tin Whisker Test Method Standards

October 12, 2021
Author(s)
I Boguslavsky, P Bush, E Kam-Lum, M Kwoka, J McCullen, K Spalding, K Vo, Maureen E. Williams
The need to better understand whisker growth has dramatically increased as component suppliers convert from tin-lead (SnPb) finishes to Pb-free finishes of Sn and low -alloy-content Sn-based finishes. Whiskers are spontaneous growth of metal filaments
Displaying 3876 - 3900 of 74647