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Displaying 29626 - 29650 of 143806

Coupling of isotropic and directional interactions and its effect on phase separation and self-assembly

February 16, 2016

Author(s)

Debra J. Audus, Francis W. Starr, Jack F. Douglas

The interactions of molecules and particles in solution often involve an interplay between isotropic and highly directional interactions that lead to a mutual coupling of phase separation and self-assembly. This situation arises, for example, in proteins

Design Optimization of Hybrid-Switch Soft-Switching Inverters using Multi-Scale Electro-Thermal Simulation

February 16, 2016

Author(s)

Jose M. Ortiz, Tam H. Duong, Allen R. Hefner Jr., Jih-Sheng Lai

A multi-scale electro-thermal simulation approach is presented to optimize the design of a hybrid switch soft-switching inverter using a library of dynamic electro-thermal component models parameterized in terms of electrical, structural and material

Field Portable Low Temperature Porous Layer Open Tubular Cryoadsorption Headspace Sampling and Analysis Part II: Applications*

February 16, 2016

Author(s)

Megan Harries, Santiago Bukovsky-Reyes, Thomas J. Bruno

This paper details the sampling methods used with the field portable PLOT-cryoadsorption (PLOT-cryo) approach, described in Part I of this two-part series, applied to several analytes of interest. We conducted tests with coumarin and 2,4,6-trinitrotoluene

On the significant enhancement of continuum-collision induced absorption in H2O+CO2 mixtures

February 16, 2016

Author(s)

Yuri I. Baranov

The IR spectra of water vaporcarbon dioxide mixtures as well as the spectra of pure gas samples have been recorded using a Fourier-transform infrared spectrometer at a resolution of 0.1 cm−1 in order to explore the effect of colliding CO2 and H2O

Portable high-accuracy non-absorbing laser power measurement at kilowatt levels by means of radiation pressure

February 16, 2016

Author(s)

Paul A. Williams, Joshua A. Hadler, Frank C. Maring, Robert Lee, Kyle A. Rogers, Brian J. Simonds, Matthew T. Spidell, Ari D. Feldman, John H. Lehman

We describe a unique optical power meter which measures the radiation pressure to accurately determine a lasers optical power output. This approach traces its calibration of the optical Watt to the kilogram. Our power meter is designed for high-accuracy

The lifetime of 4p54d levels in highly ionized atoms

February 16, 2016

Author(s)

G. Gaigalas, P. Rynkun, Charlotte F. Fischer

Energy levels, lifetimes, and wave function compositions have been computed for all atomic states of the 4p6 and 4p54d configurations using a single-reference (SR) configuration state along with single- and double-substitutions (SD) to generate expansions

Experimental dynamic trapping of electrostatically actuated bistable micro-beams

February 15, 2016

Author(s)

Lior Medina, Rivka Gilat, Robert Ilic, Slava Krylov

We demonstrate dynamic snap-through from a primary to a secondary statically inaccessible stable configuration in single crystal silicon, curved, doubly clamped micromechanical beam structures. Nanoscale motion of the fabricated bistable micromechanical

Near-field control and imaging of free charge carrier variations in GaN nanowires

February 15, 2016

Author(s)

Samuel Berweger, Paul T. Blanchard, Matthew Brubaker, Kevin J. Coakley, Norman A. Sanford, Thomas Mitchell (Mitch) Wallis, Kris A. Bertness, Pavel Kabos

Despite their uniform crystallinity, the shape and faceting of semiconducting nanowires (NWs) can give rise to variations in structure and associated electronic properties. Here we investigate local variations in electronic structure across individual n

Facile and low-cost length sorting of single-wall carbon nanotubes by precipitation and applications for thin-film transistors

February 14, 2016

Author(s)

Jeffrey Fagan, Hui Gui, Chongwu Zhou, Bilu Liu, Haitian Chen, Ming Zheng

Semiconducting single-wall carbon nanotubes (SWCNTs) with long lengths are highly desirable for many applications such as thin film transistors and circuits. Previous reported length sorting techniques usually require sophisticated instrumentations and are

Measuring laser power as a force: A new paradigm to accurately monitor optical power during laser-based machining operations

February 14, 2016

Author(s)

Paul A. Williams, Brian J. Simonds, Jeffrey W. Sowards, Joshua A. Hadler

In laser manufacturing operations, accurate measurement of laser power is important for product quality, operational repeatability, and process validation. Accurate real-time measurement of high-power lasers, however, is difficult. Typical thermal power

An Overview of Spectral Imaging of Human Skin toward Face Recognition

February 13, 2016

Author(s)

David W. Allen

Spectral imaging is a form of remote sensing that provides a means of collecting information from surroundings without physical contact. Differences in spectral reflectance over the electromagnetic spectrum allow for the detection, classification, or

Effects of Heat-treatment on the Stability and Composition of Metabolomic Extracts from the Earthworm Eisenia fetida

February 13, 2016

Author(s)

Tracey B. Schock, Sheri Strickland, Edna J. Steele, Daniel W. Bearden

Environmental metabolomics studies employing earthworms as sentinels for soil contamination are numerous, but the instability of the metabolite extracts from these organisms has been minimally addressed. This study evaluated the efficacy of adding a heat-

Optical system design for femtosecond-level synchronization of clocks

February 13, 2016

Author(s)

Laura C. Sinclair, William C. Swann, Jean-Daniel Deschenes, Hugo Bergeron, Fabrizio R. Giorgetta, Esther Baumann, Michael A. Cermak, Ian R. Coddington, Nathan R. Newbury

Synchronization of optical clocks via optical two-way time-frequency transfer across free-space links can result in time offsets between the two clocks below tens of femtoseconds over many hours. The complex optical system necessary to support such

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