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Displaying 20051 - 20075 of 73751

Capabilities of Single Particle Inductively Coupled Plasma Mass Spectrometry for the Size Measurement of Nanoparticles: A Case Study on Gold Nanoparticles

February 28, 2014
Author(s)
Jingyu Liu, Karen E. Murphy, Robert I. MacCuspie, Michael R. Winchester
The increasing application of engineered nanomaterials in consumer and medical products has motivated the development of single particle inductively coupled plasma mass spectrometry (spICP-MS) for characterizing nanomaterials under realistic environmental

Hydrodynamic Behavior of Carbon Nanotubes and Characterization of Length Distributions

February 28, 2014
Author(s)
Carlos A. Silvera Batista, Ming Zheng, Constantine Y. Khripin, Xiaomin X. Tu, Jeffrey Fagan
The sedimentation behavior of SWCNTs was studied through analytical ultracentrifugation. SWCNTs were dispersed with the aid of surfactants, doubly sorted by density and length to produce samples with invariant diameter distributions and aspect ratios that

Methods for improving visibility measurement standards of powered industrial vehicles

February 28, 2014
Author(s)
Roger V. Bostelman, Jochen Teizer, Soumitry J. Ray, Mike Agronin, Dominic Albanese
Poor visibility of powered industrial vehicles, such as forklifts, used in industry is often the cause of accidents that include pedestrians. Current standards allow up to 20% non-visible regions for forklifts where measurement of these regions is

Trust Issues with Opportunistic Encryption

February 28, 2014
Author(s)
Scott W. Rose
Recent revelations have shed light on the scale of eavesdropping on Internet traffic; violating the privacy of almost every Internet user. In response, protocol designers, engineers and service operators have begun deploying encryption (often opportunistic

Characterization of InGaN quantum disks in GaN nanowires

February 27, 2014
Author(s)
Alexana Roshko, Roy H. Geiss, John B. Schlager, Matthew D. Brubaker, Kristine A. Bertness, Norman A. Sanford, Todd E. Harvey
Catalyst-free GaN nanowires with InGaN quantum disks (QDs) were characterized by scanning/transmission electron microscopy (S/TEM) and photoluminescence. A variety of structures, from QDs with large strain fields to apparently strain free QDs were observed

Engineering Plant Cell Walls: Tuning Lignin Monomer Composition for Deconstructable Biofuels Feedstocks or Resilient Biomaterials

February 27, 2014
Author(s)
Peter Ciesielski, Michael Resch, Barron Hewetson, Jason Killgore, Alexandra Curtin, Nick Anderson, Ann Chiaramonti Debay, Donna C. Hurley, Aric Sanders, Michael Himmel, Clint Chapple, Nathan Mosier, Bryon Donohoe
Advances in genetic manipulation of the biopolymers that compose plant cell walls will facilitate more efficient production of biofuels and chemicals from biomass and lead to specialized biomaterials with tailored properties. Here we investigate several

Fundamental Equation of State for Deuterium

February 27, 2014
Author(s)
Ian A. Richardson, Jacob W. Leachman, Eric Lemmon
World utilization of deuterium is anticipated to increase with the rise of fusion energy machines such as ITER and NIF. We present a new fundamental equation of state for the thermodynamic properties of fluid deuterium. Differences between thermodynamic

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
Displaying 20051 - 20075 of 73751
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