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Displaying 20251 - 20275 of 73960

Liquidlike Correlations in Single-Crystalline Y 2 Mo 2 O 7 : An Unconventional Spin Glass

February 27, 2014
Author(s)
H. J. Silverstein, K. Fritsch, F. Flicker, A. M. Hallas, Jason S. Gardner, Yiming Qiu, G. Ehlers, A. T. Savici, Z. Yamani, K. A. Ross, B. D. Gaulin, M. J. P. Gingras, J. A. M. Paddison, K. Foyevtsova, R. Valenti, F. Hawthorne, C. R. Wiebe, H. D. Zhou
The phenomenon of melting is among one of the most well studied phase transitions in condensed matter science. Even though the process is well-understood is a number of materials including simple metals, nanoparticles, ionic and molecular solids, and

A collapse of the cross-spectral function in phase noise metrology

February 25, 2014
Author(s)
Craig W. Nelson, Archita Hati, David A. Howe
Cross-spectral analysis is a mathematical tool for extracting the power spectral density of a correlated signal from two time series in the presence of uncorrelated interfering signals. We demonstrate and explain a set of conditions where the detection of

A Spectral Analytic Method for Fingerprint Image Sample Rate Estimation

February 25, 2014
Author(s)
John M. Libert, Shahram Orandi, John D. Grantham, Michael D. Garris
This study examines the use of the NIST Spectral Image Validation and Verification (SIVV) metric for the application of detecting the sample rate of a given fingerprint digital image. SIVV operates by reducing an input image to a 1-dimensional power

Compression Guidance for 1000 ppi Friction Ridge Imagery

February 24, 2014
Author(s)
Shahram Orandi, John M. Libert, John D. Grantham, Kenneth Ko, Stephen S. Wood, Frederick R. Byers, Bruce Bandini, Stephen G. Harvey, Michael D. Garris
This special publication provides guidance for compression of 1000 ppi friction ridge imagery as well as an interoperability pathway between legacy 500 ppi friction ridge imagery and new 1000 ppi friction ridge image data.

Laser-assisted atom probe tomography of MBE grown GaN nanowire heterostructures

February 24, 2014
Author(s)
Norman A. Sanford, Paul T. Blanchard, Matthew D. Brubaker, Kristine A. Bertness, John B. Schlager, R Kirchofer, David R. Diercks, Brian Gorman
Laser-assisted atom probe tomography (L-APT) was performed on GaN nanowires (NWs) and axial GaN/InGaN nanowire heterostructures. All samples were grown by MBE on Si(111) substrates. The laser pulse energy (PE) at 355 nm used in L-APT analysis of GaN NWs

Micro-Deformation in the Fracture of a Toughened Epoxy

February 24, 2014
Author(s)
Donald Hunston, Cyril Clerici, Aurelien Blond, Aaron Forster
Thermoset resins are used in many composites and structural adhesives because they have excellent proper-ties. Unfortunately, they tend to be quite brittle. Over the last 50 years, there has been a major effort to improve the toughness of thermosets, and

Structure-Property Relationships in Polyethylene Fusion Bonds

February 24, 2014
Author(s)
Aaron Forster, Kar T. Tan, Wei-Lun Ho, Donald Hunston
Polyethylene (PE) is used significantly for a wide range of critical fluid transport applications from water to fossil fuels. The advantages of polyethylene are competi-tive cost compared to metallic pipe, lower corrosion rates, and toughness. The key to

Detection of 3D Interconnect Bonding Voids by IR Microscopy

February 20, 2014
Author(s)
Jonny H?glund, Zoltan Kiss, Gyorgy Nadudvari , Zsolt Kovacs, Szabolcs Velkei, Moore Chris, Victor H. Vartanian, Richard A. Allen
There are a number of factors driving 3D integration including reduced power consumption, RC delay, and form factor as well as increased bandwidth. However, before these advantages can be realized, various technical and cost hurdles must be overcome. One

Dipole-Dipole Interactions in TiOPc Adlayers on Ag

February 20, 2014
Author(s)
Steven W. Robey, Xianjie Liu, Yinying Wei, Janice E. Reutt-Robey
The molecular organization in layers of a polar phthalocyanine, titanyl phthalocyanine (TiOPc), on the Ag(110) surface was studied with scanning tunneling microscopy (STM). TiOPc molecules adsorb on Ag(110) in a tilted configuration in contrast to the flat

IAQ 2013 Tools Topic Overview

February 20, 2014
Author(s)
Steven J. Emmerich, Larry Schoen
The complex relationships between indoor and outdoor environmental conditions, coupled with the impacts of climate change, make it more important than ever before that buildings be comfortable and healthy for the occupants yet also energy efficient. This

Inverse Vulcanization of Elemental Sulfur to Prepare Polymeric Electrode Materials for Li-S Batteries

February 20, 2014
Author(s)
Christopher L. Soles, Vladimir P. Oleshko, Jenny J. Kim, Adam Simmonds, Jared Griebel, Jeff Pyun, Jungjin Park, Woo Jin Chung, Woo Tae Kim, Richard Glass, Yung-Eun Sun, Kookheon Char
Sulfur-rich copolymers were synthesized via inverse vulcanization to create electroactive cathode materials for lithium-sulfur battery applications. These materials exhibit enhanced capacity retention (1005 mAh/g at 100 cycles) and extended battery

A Strategy for Testing Graphic File Carving Tools

February 19, 2014
Author(s)
James R. Lyle, Richard P. Ayers
File carving is widely used in digital investigations to extract deleted files from unallocated storage. Usually file carving is applied to file types with a recognizable structure so that unallocated space can be scanned for file components that are then

Framework for Improving Critical Infrastructure Cybersecurity

February 19, 2014
Author(s)
Kevin M. Stine, Kim Quill, Gregory A. Witte
Recognizing that the national and economic security of the United States depends on the resilience of critical infrastructure, President Obama issued Executive Order (EO) 13636, Improving Critical Infrastructure Cybersecurity, in February 2013. It directed
Displaying 20251 - 20275 of 73960
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