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Search Publications

NIST Authors in Bold

Displaying 17851 - 17875 of 73697

Applied Force-based Multi-Fingered Grasping and Manipulation Control

May 30, 2015
Author(s)
Karl Van Wyk
This work presents experimental results on a recently developed manipulation controller applied to a multi-fingered robotic hand to execute both grasping and manipulation tasks. The active control strategy was applied to a three-fingered, seven degree of

Magnetic Structure and Ordering of Multiferroic Hexagonal LuFeO 3

May 29, 2015
Author(s)
Steven M. Disseler, Julie A. Borchers, Charles M. Brooks, Julia A. Mundy, Jarrett A. Moyer, Daniel A. Hillsberry, Eric L. Thies, Dmitri A. Tenne, John Heron, Megan Holtz, James D. Clarkson, Gregory M. Stiehl, Peter Schiffer, David A. Muller, Darrell G. Schlom, William D. Ratcliff
We report on the magnetic structure and ordering of hexagonal LuFeO 3 films of variable thickness grown by molecular-beam epitaxy (MBE) on YSZ (111) and Al 2O 3 (0001) substrates. These crystalline films exhibit long-range structural uniformity dominated

The impact of current CH4 and N2O atmospheric loss process uncertainties on calculated ozone abundances and trends

May 29, 2015
Author(s)
Vladimir L. Orkin, Eric L. Fleming, Christian George, Dwayne E. Heard, Charles H. Jackman, Michael J. Kurylo , Abdelwahid Mellouki , J B. Burkholder
The atmospheric loss processes of N2O and CH4, their estimated uncertainties, lifetimes, and impacts on ozone abundance and long-term trends are examined using atmospheric model calculations and updated kinetic and photochemical parameters and uncertainty

A Miniature EBIT with Ion Extraction for Isolating Highly Charged Ions

May 28, 2015
Author(s)
Shannon Hoogerheide, Joseph Tan
We report on the development of a room-temperature miniature electron beam ion trap (EBIT) for efficient production of charge states with relatively low ionization energies. A unitary Penning trap is modified slightly to provide the magnetic field and

Simulation Methodology for Coupled Structural Fire Analysis

May 28, 2015
Author(s)
Chao Zhang, Julio C. Goncalves Da Silva, Craig G. Weinschenk, Daisuke Kamikawa, Yuji Hasemi
Advanced simulation methods are needed to precisely predict the complex behavior of structures exposed to natural fire conditions. Fire Dynamics Simulator (FDS) is a computational fluid dynamics (CFD) code, developed by NIST for fire related simulations

Spectrum and Energy Levels of Quadruply-Ionized Molybdenum (Mo V)

May 28, 2015
Author(s)
Joseph Reader, Tauheed Ahmad
The spectrum of quadruply-ionized molybdenum Mo V was observed from 200 Å to 4700 Å with sliding spark discharges on 10.7-m normal- and grazing-incidence spectrographs. The existing analyses of this spectrum [Tauheed A et al. 1985 Phys. Scr. 31 369; Cabeza

The Decoupled Potential Integral Equation for Time-Harmonic Electromagnetic Scattering

May 28, 2015
Author(s)
Felipe Vico, Leslie Greengard, Miguel Ferrando, Zydrunas Gimbutas
We present a new formulation for the problem of electromagnetic scattering from perfect electric conductors. While our representation for the electric and magnetic fields is based on the standard vector and scalar potentials A, φ in the Lorenz gauge, we

Experimentally, How Does Cu TSV Diameter Influence its Stress State?

May 27, 2015
Author(s)
Chukwudi A. Okoro, Lyle E. Levine, Yaw S. Obeng, Ruqing Xu
In this work, an experimental study of the influence of Cu through-silicon via (TSV) diameter on stress build up was performed using synchrotron-based X-ray microdiffraction technique. Three Cu TSV diameters were studied; 3 µm, 5 µm and 8 µm, all of which

Performance of a next generation sequencing SNP assay on degraded DNA

May 27, 2015
Author(s)
Katherine Gettings, Kevin M. Kiesler, Peter Vallone
Forensic DNA casework samples are often of insufficient quantity or quality to generate full profiles by conventional DNA typing methods. Amplification of STR loci is inherently limited in samples containing degraded DNA, as the cumulative size of repeat

Utilizing Nearest-Neighbor Interactions to Alter Charge Transport Mechanisms in Molecular Assemblies of Porphyrins on Surfaces

May 27, 2015
Author(s)
James G. Kushmerick, Amanda E. Schuckman, Lisa M. Perez, Mikki Vinodu, Joao Tome, Lam H. Yu, Charles M. Drain, James D. Batteas
When tunneling is the dominant mechanism of charge transport in a molecular junction, the conductivity of the junction is largely insensitive to chemical and structural perturbations which do not impact the overall length of the junction. This severely

Characterizing the three-dimensional structure of block copolymers via sequential infiltration synthesis and scanning transmission electron tomography

May 26, 2015
Author(s)
Tamar Segal-Peretz, Jonathan P. Winterstein, Manolis Doxastakis, Abelardo Ramirez-Hernandez, Mahua Biswas, Jiaxing Ren, Hyo S. Suh, Seth B. Darling, James Alexander Liddle, Jeffrey Elam, Juan J. de Pablo, Nestor Zaluzec, Paul Nealey
Understanding and controlling the three-dimensional structure of block copolymer (BCP) thin films is critical for utilizing these materials for sub-20 nm nanopatterning in semiconductor devices, as well as in membranes and solar cell applications

UWB Signal Processing: Projection, B-Splines, and Modified Gegenbauer Bases

May 25, 2015
Author(s)
Howard S. Cohl, Stephen D. Casey
Ultra-wide band (UWB) systems require either rapidly changing or very high sampling rates. Conventional analog-to-digital devices have limited dynamic range. We investigate UWB signal processing via a basis projection method and a basis system designed for

A real microstructural model for cement concrete modeling

May 24, 2015
Author(s)
Edward J. Garboczi, Yang Lu, Stephen Thomas
Existing concrete microstructural models of particles embedded in matrix materials are only represented by regular shape particles like spheres, ellipsoids, or multi-faceted polyhedrons. However, the real particle shapes are more complex and sometimes play

Evaluating Bug Finders: Test and Measurement of Static Code Analyzers

May 23, 2015
Author(s)
Aurelien M. Delaitre, Bertrand C. Stivalet, Elizabeth N. Fong, Vadim Okun
Software static analysis is one of many options for finding bugs in software. Like compilers, static analyzers take a program as input. This paper covers tools that examine source code--without executing it--and output bug reports. Static analysis is a
Displaying 17851 - 17875 of 73697
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