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Displaying 22401 - 22425 of 73929

Chirality-controlled cloning of carbon nanotubes

November 13, 2012
Author(s)
Ming Zheng, Xiaomin X. Tu, Jia Liu, Chuan Wang, Chongwu Zhou
Carbon nanotubes possess superior electrical and optical properties and hold great promise for electronic and biomedical applications1-10. The electronic properties of carbon nanotubes strongly depend on their chirality, with 1/3 being metallic1, 2/3 being

Vibrational modes of GaN nanowires in the gigahertz range

November 13, 2012
Author(s)
Ward L. Johnson, Sudook A. Kim, Roy H. Geiss, Colm Flannery, Kristine A. Bertness, Paul R. Heyliger
Monocrystalline nanowires offer an attractive basis for resonant nanoelectromechanical systems (NEMS) for a variety of applications, including mass and force sensing, and, in each of these applications, there are advantages to operation at frequencies

Ultra-low noise regenerative frequency divider

November 11, 2012
Author(s)
Archita Hati, Craig W. Nelson, Corey A. Barnes, Danielle G. Lirette, Jason A. DeSalvo, David A. Howe
We designed ultra-low noise regenerative divider-by-2 circuits that operate at input frequencies of 20 MHz and 10 MHz. We achieved residual output-referred single-sideband phase noise below -162 dBc/Hz at 10 Hz offset for a single divider at these

Bridging the gap between random microstructure and 3-D meshing

November 10, 2012
Author(s)
Edward Garboczi, Yang Lu
There are different ways of mathematically representing 3-D heterogeneous material structures. But for each of these methods, usually the desired end result is a 3-D finite element mesh that will be used to investigate the mechanical properties of the

Testing the Nations Health care Information Infrastructure

November 10, 2012
Author(s)
Kevin G. Brady, Ram D. Sriram, Bettijoyce B. Lide, Kathleen M. Roberts
According to a report by the Center for Medicare and Medicaid Services [CMS] (http://www.cms.gov), the United States spent nearly $2.6 trillion dollars on health care in 2010. It is estimated that this will nearly double by the end of this decade. This is

Electronic structure of Ba-Ga-Ge-Si Type I Clathrates: A Ge and Ga K-Edge Study

November 9, 2012
Author(s)
Winnie Wong-Ng, Azzam Mansour, Joshua Martin, George S. Nolas
XANES spectroscopy was successfully used to study changes in the density of unoccupied states for silicon substituted Ba8Ga16Ge30-xSix type I clathrates. Partial density of unoccupied states with p character is modified for both Ga and Ge upon Si

Fast Sequential Importance Sampling to Estimate the Graph Reliability Polynomial

November 8, 2012
Author(s)
David G. Harris, Francis Sullivan, Isabel M. Beichl
The reliability polynomial of a graph measures the number of its connected subgraphs of various sizes. Algortihms based on sequential importance sampling (SIS) have been proposed to estimate a graph's reliahbility polynomial. We develop an improved SIS

Modeling of Reinforced Concrete Assemblies under a Column Removal Scenario

November 8, 2012
Author(s)
Yihai Bao, Hai S. Lew, Sashi K. Kunnath
This paper presents a computational investigation of two reinforced concrete beam-column assemblies, each comprising three columns and two beams, subjected to monotonically increasing vertical displacement of the unsupported center column simulating a

The 2012 IEEE-RAS Safety, Security and Rescue Robotics Summer School

November 8, 2012
Author(s)
Raymond Sheh, Haldun Komsuoglu, Adam Jacoff, Tetsuya Kimura, Daniele Nardi, Johannes Pellenz, Gerald Steinbauer
The 2012 IEEE Robotics and Automation Society Safety, Security and Rescue Robotics Summer School was held from the 9th to the 15th of September in Alanya, Turkey, and brought together a select group of students, researchers, responders, manufacturers and

EVALUATING METHODS OF SHIPPING THIN SILICON WAFERS FOR 3D STACKED APPLICATIONS

November 7, 2012
Author(s)
Richard A. Allen, Urmi Ray, Vidhya Ramachandran, Iqbal Ali, David T. Read, Andreas Fehk?hrer, J?rgen Burggraf
An experiment was performed to develop a method for choosing appropriate packaging for shipping 300 mm silicon wafers thinned to 100 µm or less for three-dimensional stacked integrated circuits (3DS-ICs). 3DS-ICs hold the promise of improved performance

Nanoscale Reference Materials for Environmental, Health, and Safety Measurements: Needs, Gaps, and Opportunities

November 7, 2012
Author(s)
Aleksandr B. Stefaniak, Vincent A. Hackley, Gert Roebben, Kensei Ehara, Steve Hankin, Michael T. Postek, Iseult Lynch, Wei-En Fu, Thomas P. Linsinger, Andreas Th?nemann
There is a need to understand and manage potential risks posed to workers, the public, and the environment from exposure to engineered nanomaterials. In response, several organizations have developed lists of relevant nano-objects and of physico-chemical

Structural Association of Nonsteroidal Anti-Inflammatory Drugs with Lipid Membranes

November 7, 2012
Author(s)
Mohan Babu Boggara, Mihaela Mihailescu, Ramanan Krishnamoorti
The location and distribution of ibuprofen, a model nonsteroidal anti-inflammatory drug, in a phospholipid bilayer was examined in molecular detail by a combination of neutron diffraction and computer simulations. In addition to their use as antipyretic

Class Numbers via 3-Isogenies and Elliptic Surfaces

November 6, 2012
Author(s)
Cam McLeman, Dustin Moody
We show that a character sum attached to a family of 3-isogenies defi ned on the fibers of a certain elliptic surface over Fp relates to the class number of the quadratic imaginary number field Q(\sqrtp}). In this sense, this provides a higher-dimensional

Reduction Formulae for Products of Theta Functions

November 6, 2012
Author(s)
Peter L. Walker
In four cases it is already known that the product of two distinct Jacobian theta functions having the same variable z and the same nome q is a multiple of a single Jacobian theta function, with the multiple independent of z. The main purpose of the

Two dimensional spectroscopic imaging of individual ferromagnetic nanostripes

November 6, 2012
Author(s)
Han-Jong H. Chia, Feng Guo, Lyubov Belova, Robert McMichael
We use ferromagnetic resonance force microscopy (FMRFM) to spectroscopically image the edge modes in individual 700 and 400 nm wide Permalloy stripes with a spatial resolution on the order of 200 nm. The imaging clearly identi es some resonances as edge
Displaying 22401 - 22425 of 73929
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