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Displaying 18026 - 18050 of 74071

Fullerene-free polymer solar cells with strongly reduced bimolecular recombination and field- independent charge carrier generation

August 21, 2014
Author(s)
Steffen Roland, Marcel Schubert, Brian A. Collins, Jona Kurpiers, Zhihua Chen, Antonio Facchetti, Harald Ade, Dieter Neher
Photogeneration, recombination and transport of free charge carriers in all-polymer bulk heterojunction solar cells incorporating P3HT as donor and P(NDI2OD-T2) as acceptor polymer have been investigated by the use of time delayed collection field (TDCF)

Methane Storage in Metal-Organic Frameworks

August 21, 2014
Author(s)
Yabing He, Wei Zhou, Guodong Qian, Banglin Chen
Natural gas (NG), whose main component is methane, is an attractive fuel for vehicular applications. Realization of safe, cheap and convenient means and materials for high-capacity methane storage can significantly facilitate the implementation of natural

Phase Segregation of Sulfonate Groups in Nafion Interface Lamellae, Quantified via Neutron Reflectometry Fitting Techniques for Multi-Layered Structures

August 21, 2014
Author(s)
Steven C. DeCaluwe, Paul A. Kienzle, Pavan Bhargava, Andrew M. Baker, Joseph Dura
Neutron reflectometry analysis methods are developed and used to determine the composition depth profile in cases where the structure is no known a priori. These methods, including statistical methods, sophisticated fitting routines, and coupling multiple

Single-shot security for one-time memories in the isolated qubits model

August 21, 2014
Author(s)
Yi-Kai Liu
One-time memories (OTM's) are simple, tamper-resistant cryptographic devices, which can be used to implement sophisticated functionalities such as one-time programs. OTM's cannot exist in a fully-classical world, or in a fully-quantum world, but there is

Sustainability Characterization for Additive Manufacturing

August 21, 2014
Author(s)
Kevin W. Lyons, Satyandra K. Gupta
Additive manufacturing (AM) has the potential to create geometrically complex parts that require a high degree of customization, using less material and producing less waste. Recent studies have shown that AM can be an economically viable option for use by

Topological Robustness of Transport Statistics for Photons in a Synthetic Gauge Field

August 20, 2014
Author(s)
Sunil Mittal, Jingyun Fan, Sanli Faez, Alan L. Migdall, Jacob M. Taylor, Mohammad Hafezi
Electronic transport through a disordered medium leads generically to localization, where conductance drops exponentially with system size, even at zero temperature. The addition of gauge fields to disordered media leads to fundamental changes in transport

Influence of the heat-treatment conditions, microchemistry, and microstructure on the irreversible strain limit of a selection of Ti-doped internal-tin Nb 3 Sn ITER wires

August 19, 2014
Author(s)
Najib Cheggour, Loren F. Goodrich, Z-H Sung, Theodore C. Stauffer, Jolene D. Splett, P. J. Lee, Matthew C. Jewell
Systematic studies of the intrinsic irreversible strain limit ε irr0, microstructure, and microchemistry were made on several internal-tin Nb 3Sn pre-production wires fabricated for the domestic agencies of the U.S.A. and China participating in the

The Future of Cybersecurity Education

August 19, 2014
Author(s)
Ernest L. McDuffie, V. P. Piotrowski
By fostering public-private partnerships in cybersecurity education, the US government is motivating federal agencies, industry, and academia to work more closely together to defend cyberspace.

An Information Classification System for Life Cycle and Manufacturing Standards

August 18, 2014
Author(s)
Sarah Wolff, Anantha Narayanan Narayanan, David Lechevalier, KC Morris
Sustainable manufacturing aims to increase efficiency and offset negative impacts throughout the life cycle of products. A myriad of standards pertaining to various aspects of a product's life cycle exist; however, it is often difficult for non-experts to

Analysis of the Noise Spectra from Oxidized Superparamagnetic Nanoparticles

August 18, 2014
Author(s)
Solomon I. Woods, Snorri Ingvarsson, Shouheng Sun, John Kirtley
Expressions for the thermal noise from a collection of exchange-biased magnetic nanoparticles are derived and used to analyze the magnetic noise from thin films of partially oxidized nanoparticles. Functionalized Co nanoparticles with diameters between 3

Combining nanocalorimetry and dynamic transmission electron microscopy for in situ characterization of materials processes under rapid heating and cooling

August 18, 2014
Author(s)
Michael D. Grapes, Thomas LaGrange, Lawrence Henry Friedman, Bryan W. Reed, Geoffrey H. Campbell, Timothy P. Weihs, David A. LaVan
Nanocalorimetry is a chip-based thermal analysis technique capable of analyzing endothermic and exothermic reactions at very high heating and cooling rates. Here we couple a nanocalorimeter with an extremely fast in situ microstructural characterization

Dielectrofluidics for Electronic-Based Chemical and Particle Analysis

August 18, 2014
Author(s)
James C. Booth, Spencer T. Egan, Charles A. Little, A Padilla, Yu Y. Wang, Nathan D. Orloff
The interactions of electromagnetic fields with matter are described by means of the polarization and magnetization of the material under study. Analogous to the way that magnetofluidics seeks to exploit magnetic interactions for sensing and manipulating

Engineering three-body interaction and Pfaffian states in circuit QED systems

August 18, 2014
Author(s)
Mohammad Hafezi, Prabin Adhikari, Jacob M. Taylor
We demonstrate a scheme to engineer the three-body interaction in circuit-QED systems by tuning a fluxonium qubit. Connecting such qubits in a square lattice and controlling the tunneling dynamics, in the form of a synthesized magnetic field, for the

Broadband Rydberg Atom Based Self-Calibrating RF E-field Probe

August 16, 2014
Author(s)
Christopher L. Holloway, Joshua A. Gordon, Steven R. Jefferts, Thomas P. Heavner
We present a significantly new approach for an electric (E) field probe. The probe is based on the interaction of RF-fields with Rydberg atoms, where alkali atoms are excited optically to Rydberg states and the applied RF-field alters the resonant state of

Effect of Ozonation on Fungal Resistance of Bamboo and Oak

August 15, 2014
Author(s)
Chi Hoang, Tinh Nguyen, Deborah Jacobs, Andrew K. Persily, Richard Cosi
Wood is gaining increased interest as a renewable building material. However, color changes, chemical and microbiological degradation can occur when lignocellulosic materials are exposed to environmental stressors such as ozone and elevated humidity. In

Miniature all-solid-state heterostructure nanowire Li-ion batteries as a tool for engineering and structural diagnostics of nanoscale electrochemical processes.

August 15, 2014
Author(s)
Vladimir P. Oleshko, Thomas F. Lam, Dmitry A. Ruzmetov, Paul M. Haney, Henri J. Lezec, Albert Davydov, Sergiy Krylyuk, John Cumings, Albert A. Talin
Complex interfacial phenomena and phase transformations that govern the operation of Li-ion batteries (LiBs) require detailed nanoscale 3D structural and compositional characterization that can be directly related to the capacity and electrical transport

On the Unification of Access Control and Data Services

August 15, 2014
Author(s)
David F. Ferraiolo, Serban I. Gavrila, Wayne Jansen
A primary objective of enterprise computing (via a data center, cloud, etc.) is the controlled delivery of data services (DS). Typical DSs include applications such as email, workflow, and records management, as well as system level features, such as file

Precision limitations in coherent laser ranging due to speckle phase noise

August 15, 2014
Author(s)
Esther Baumann, Jean-Daniel Deschenes, Fabrizio R. Giorgetta, William C. Swann, Ian R. Coddington, Nathan R. Newbury
The ultimate precision of coherent laser three-dimensional mapping of a diffusely scattering surface will be determined by speckle noise. Speckle phase noise gives rise both to apparent range outliers and to excess range noise during lateral scans
Displaying 18026 - 18050 of 74071