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Displaying 15101 - 15125 of 73893

Analytical Gaps and Challenges for Particles in the Submicrometer Size Domain

November 30, 2016
Author(s)
Scott Aldrich, Shawn Cao, Andrea Hawe, Desmond Hunt, Linda Narhi, Dean C. Ripple, Satish Singh
This Stimuli article provides a technical discussion of the available technologies for submicrometer particle analysis, including consideration of the advantages, disadvantages, and technical gaps for each application. These methods can be used in the

Chip-Packaged Silicon Photonic Nanoscale Thermometers

November 30, 2016
Author(s)
Nikolai Klimov, Thomas P. Purdy, Zeeshan Ahmed
We report on the development of on-chip integrated packaged nanoscale silicon photonic themperature sensors capable to detect temperature difference as small as 70 µK, thus showing the potential to replace legacy-based resistance thermometers

Epoxy Composites Using Wood Pulp Components as Fillers

November 30, 2016
Author(s)
Douglas M. Fox, Noy Kaufman, Jeremiah W. Woodcock, Jeffrey W. Gilman, John R. Shields, Rick D. Davis, Szabolcs Matko, Mauro Zammarano, Chelsea S. Davis
The components of wood, especially lignin and cellulose, have great potential for improving the properties of polymer composites. In this chapter, we discuss some of the latest developments from our lab on incorporating wood based materials into epoxy

Infrared measurement of the temperature at the tool-chip interface while machining Ti-6Al-4V

November 29, 2016
Author(s)
Jarred C. Heigel, Eric P. Whitenton, Brandon M. Lane, M A. Donmez, Wilfredo Moscoso-Kingsley, Vis Madhavan
The challenges associated with machining titanium alloys (e.g. Ti-6Al-4V) are directly related to high cutting tool temperatures due to the low thermal conductivity of titanium alloys and the heat generated in the primary shear zone and at the tool-chip

Metastable Layered Cobalt Chalcogenides from Topochemical Deintercalation

November 29, 2016
Author(s)
Xiuquan Zhou, Brandon Wilfong, Hector Vivanco, Johnpierre Paglione, Craig Brown, Efrain E. Rodriguez
We present a general strategy to synthesize metastable layered materials via topochemical de-intercalation of thermodynamically stable to phases.Through kinetic control of the de-intercalation reaction, we have prepared two hypothesized metastable

Multi-Component Fe-Ni Oxide Nanocatalysts for Oxygen Evolution and Methanol Oxidation Reactions under Alkaline Conditions

November 29, 2016
Author(s)
Stephanie L. Candelaria, Nicholas M. Bedford, Taylor J. Woehl, Nikki S. Rentz, Allison R. Showalter, Svitlana Pylypenko, Bruce A. Bunker, Sungsik Lee, Benjamin Reinhart, Yang Ren, S P. Ertem, E. B. Coughlin, Nicholas A. Sather, James L. Horan, Andrew M. Herring, Lauren F. Greenlee
The electrolysis of water for hydrogen generation and the electrochemical oxidation of alternative fuels such as methanol for alkaline fuel cells often relies on the use of precious metal catalysts. However, the scarcity and high cost of these precious

Intermediate Regime between Metal and Superconductor Below T = 100 K in NiSi

November 28, 2016
Author(s)
Ashutosh Dahal, Jagath Gunasekera, Leland Harriger, S. H. Lee, Y. S. Hor, David J. Singh, Deepak K. Singh
Magnetic response of a metal to an external magnetic field is termed as paramagnetic or diamagnetic, depending on the parallel or antiparallel alignment of electron's moment to the applied field, respectively. 1-3 It remains independent of temperature of

Multispectral MR imaging and sensing using shaped nanoparticles

November 26, 2016
Author(s)
Gary Zabow
The idea that size and shape can determine color is well known in optics-based quantum dot and plasmonic nanoparticle fields. But what about in the radio-frequency (RF) portion of the spectrum? This chapter reviews recent work on specially shaped magnetic

The sixth spectrum of platinum (Pt VI)

November 25, 2016
Author(s)
Vladimir I. Azarov, R R. Gayasov
The spectrum of platinum was observed in the (300 to 2100) A wavelength region. The (5d5 + 5d46s) - 5d46p transition array of five times ionized platinum, Pt VI, has been investigated and 1390 spectral lines have been classified in the region of (399 to

Effect of Charge on the Mechanical Properties of Surfactant Bilayers

November 23, 2016
Author(s)
Robert David Bradbury, Michihiro Nagao
The viscoelastic properties of surfactant bilayers have been measured over a range of surface charge densities, for a system with a low ionic strength, using small-angle neutron scattering and neutron spin echo (NSE) spectroscopy. An increase in the

Irreversible Desiccation Shrinkage of Cement Paste Caused by Cement Grain Dissolution

November 23, 2016
Author(s)
Xiaodan Li, Zachary Grasley, Jeffrey W. Bullard, Edward Garboczi
When cementitious materials are dried, internal stresses are generated that lead to desiccation shrinkage. A portion of this shrinkage is irreversible. Based on previous research indicating that dissolution of cement grains while a cementitious composite

Synthetic gauge potentials for ultracold neutral atoms

November 23, 2016
Author(s)
Ian B. Spielman, Yu-Ju Lin
Synthetic gauge fields for ultracold neutral atoms—engineered using the interaction between laser fields and the atoms' internal 'spin' degrees of freedom—provide promising techniques for generating the large (synthetic) magnetic fields required to reach

Vortex nucleation in a BoseEinstein condensate: from the inside out

November 23, 2016
Author(s)
Ian B. Spielman, Daniel Campbell, Ryan Price, Andika Putra, Dimitrius Trypogeorgos, Ana Vald?Curiel
We observed a new mechanism for vortex nucleation in Bose–Einstein condensates (BECs) subject to synthetic magnetic fields. We made use of a strong synthetic magnetic field initially localized between a pair of merging BECs to rapidly create vortices in

CODATA Recommended Values of the Fundamental Physical Constants: 2014

November 22, 2016
Author(s)
Peter J. Mohr, David B. Newell, Barry N. Taylor
This paper gives the 2014 self-consistent set of values of the constants and conversion factors of physics and chemistry recommended by the Committee on Data for Science and Technology (CODATA). These values are based on a least-squares adjustment that
Displaying 15101 - 15125 of 73893
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