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Displaying 19151 - 19175 of 73960

Nanoscale Imaging of Photocurrent and Efficiency in CdTe Solar Cells

October 15, 2014
Author(s)
Leite Marina, maxim abashin, Henri Lezec, anthony gianfrancesco, Alec Talin, Nikolai Zhitenev
The local collection characteristics of grain interiors and grain boundaries in thin film CdTe polycrystalline solar cells are investigated using scanning photocurrent microscopy. The carriers are locally generated by light injected through a small

Parameter Estimation and Uncertainty Evaluation in a Low Rician K-Factor Reverberation-Chamber Environment

October 15, 2014
Author(s)
Chih-Ming Wang, Catherine A. Remley, Ansgar T. Kirk, Ryan J. Pirkl, Christopher L. Holloway, Dylan F. Williams, Paul D. Hale
In this paper we study statistical methods for estimating the Rician K-factor when this parameter is small. A fiducial approach for making statistical inference on the K-factor is discussed. The approach requires a Monte Carlo method to compute the

TEST AND CALIBRATION OF DISPLACEMENT MEASURING LASER INTERFEROMETERS

October 15, 2014
Author(s)
Jack A. Stone Jr.
At the National Institute of Standards and Technology (NIST), we have a capability to calibrate and test laser interferometer systems used to measure displacements. Recently our calibration protocol has been modified so as to bring it into accord with a

Hardening of Structures to Wildland-Urban Interface (WUI) Fire Expsoures

October 14, 2014
Author(s)
Samuel L. Manzello
Wildfires that spread into communities, referred to as Wildland-Urban Interface (WUI) fires, have destroyed communities throughout the world. In the USA, over 46 million homes in 70,000 communities are at risk of WUI fires [1-2]. These fires have destroyed

Exceptional Superionic Conductivity in Disordered Sodium Decahydro-closo-decaborate

October 13, 2014
Author(s)
Terrence J. Udovic, Motoaki Matsuo, Wan Si NMN Tang, Hui Wu, Vitalie Stavila, Alexei V. Soloninin, Roman V. Skoryunov, Olga A. Babanova, Alexander Skripov, John J. Rush, Atsushi Unemoto, Hitoshi Takamura, Shin-Ichi Orimo
Na 2B 10h 10 undergoes a transition from an ordered monoclinic phase to a disordered, face-centered-cubic phase near 370 K with the emergence of a vacancy-rich, mobile Na + sublattice exhibiting dramatic superionicity ({approximately equal}0.01 S cm -1 at

Nonparametric Estimates of Drift and Diffusion Profiles via Fokker-Planck Algebra

October 13, 2014
Author(s)
Steven P. Lund, Michael W. Halter, Joseph B. Hubbard
Diffusion processes superimposed upon deterministic motion play a key role in understanding and controlling the transport of matter, energy, momentum, and even information in physics, chemistry, material science, biology, and communications technology

Persistent Fe Moments in the Normal-State Collapsed-Tetragonal Phase of the Pressure-induced Superconductor Ca 0.67 Sr 0.33 Fe 2 As 2

October 13, 2014
Author(s)
J.R. Jeffries, Nicholas Butch, M.J. Lipp, J.A. Bradley, K. Kirshenbaum, Shanta Saha, J. Paglione, C. Kenny-Benson, Y. Xiao, P. Chow, W. J. Evans
Using non-resonant Fe Κ}β x-ray emission spectroscopy, we reveal that Sr-doping of CaFe 2As 2 decouples the Fe moment from the volume collapse transition, yielding a collapsed-tetragonal, para-magnetic normal state out of which superconductivity develops

Synthesis, Thermal Behaviors and Dehydrogenation Kinetics Studies on Lithiated Ethylenediamine

October 13, 2014
Author(s)
Juner Chen, Guotao Wu, Zhitao Xiong, Hui Wu, Yong Shen Chua, Wei Zhou, Bin Liu, Xiaohua Ju, Ping Chen
The lithiation of ethylenediamine by LiH is a step-wise process forming the partially lithiated intermidiates LiN(H)CH 2CH 2NH 2 and [LiN(H)CH 2CH 2NH 2][LiN(H)CH 2CH 2N(H)Li] 2 prior to the formation of dilithiated ethylenediamine LiN(H)CH 2CH 2N(H)Li. A

DEVELOPMENT OF A MINIATURE, MULTICHANNEL, EXTENDED-RANGE FABRY-PEROT FIBER-OPTIC LASER INTERFEROMETER SYSTEM FOR LOW FREQUENCY SI-TRACEABLE DISPLACEMENT MEASUREMENT

October 12, 2014
Author(s)
Bartosz K. Nowakowski, Douglas T. Smith, Stuart T. Smith
Laser interferometry has become a staple of SI-traceable displacement measurement techniques. With decreasing cost per channel, miniaturization, and a multitude of commercially available off-the-shelf systems, these systems create ever more attractive

Photonic-assisted Endoscopic Analysis of W-band Waveguide

October 12, 2014
Author(s)
Jeffrey A. Jargon, DongJoon Lee, JaeYong Kwon, YoungPyo Hong
We demonstrate an endoscopic probing system to measure field distribution through a W-band waveguide. The electric fields propagating inside a WR-10 waveguide are measured utilizing W-band harmonics of a femtosecond laser with a minute photonic probe.

A Design-of-Experiments Approach to FEM Uncertainty Analysis for Optimizing Magnetic Resonance Imaging RF Coil Design

October 10, 2014
Author(s)
Jeffrey T. Fong, Nathanael A. Heckert, James J. Filliben, Li Ma, Karl F. Stupic, Kathryn E. Keenan, Stephen E. Russek
Using the RF module of COMSOL, we compute the magnetic flux density norm (BN) profiles for frequencies in the 76 to 100 MHz range, inside of a prototype birdcage coil, courtesy of Japan's National Institute of Radiological Sciences (NIRS), loaded with a

A Microliter Capillary Rheometer for Characterization of Protein Solutions

October 10, 2014
Author(s)
Steven D Hudson, Prasad S. Sarangapani, Kalman D. Migler, Jai A. Pathak
Rheometry is an important characterization tool for therapeutic protein solutions because it determines syringeability and relates indirectly to solution stability and thermodynamic interactions. Despite the maturity of rheometry, there remains a need for

Improvements in SIM Time Network and SIM Time Scale Performance

October 10, 2014
Author(s)
Michael A. Lombardi, J. Mauricio Lopez-Romero, Nelida Diaz-Munoz, E. de Carlos-Lopez, Marina Gertsvolf, Ricardo de Carvalho
We report recent results achieved within the Sistema Interamericano de Metrología (SIM) regarding the multinational cooperation program in the field of time and frequency metrology. We discuss the performance of the SIM Time Network (SIMTN) and the SIM
Displaying 19151 - 19175 of 73960
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