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Displaying 22651 - 22675 of 73783

MEMS-based universal fatigue test technique

August 22, 2012
Author(s)
Li-Anne Liew, David T. Read, Nicholas Barbosa
We have developed a MEMS (micro electro mechanical systems) -based method for fatigue testing of micro- to millimeter-sized specimens of any material (hence ‘universal’). The miniature, re- usable, stand-alone fatigue test frame is fabricated as a single

Kinematic Modeling and Calibration of a Flexure Based Hexapod Nanopositioner

August 21, 2012
Author(s)
Hongliang Shi, Hai-Jun Su, Nicholas Dagalakis, John A. Kramar
This paper covers the kinematic modeling of a flexure-based, hexapod nanopositioner and a new method of calibration for this type of nanopositioner. This six degrees of freedom tri-stage nanopositioner can generate small displacement, high-resolution

Microstructure evolution and development of annealed Ni/Au contacts to GaN nanowires

August 21, 2012
Author(s)
Andrew M. Herrero, Paul T. Blanchard, Aric W. Sanders, Matthew D. Brubaker, Norman A. Sanford, Alexana Roshko, Kristine A. Bertness
The development of Ni/Au contacts to Mg-doped GaN nanowires (NWs) is examined. Current-voltage (I-V) measurements of these Mg-doped nanowire devices frequently exhibit a strong degradation after annealing in N 2/O 2. This degradation originates from the

Structure Determination of a Polymeric Amorphous Chain Compound AlB 4 H 11

August 21, 2012
Author(s)
Xuenian Chen, Yongsheng Zhang, Yongli Wang, Wei Zhou, Douglas A. Knight, Teshome B. Yisgedu, Zhenguo Huang, Hima K. Lingam, Beau Billet, Terrence J. Udovic, Gilbert M. Brown, Sheldon G. Shore, Christopher M. Wolverton, Ji-Cheng Zhao
The structure of the amorphous aluminoborane compound AlB 4H 11 was identified through a collaborative study closely coupling theoretical predictions via the PEGS+DFT approach with experimental measurements using IR, NMR, and neutron vibrational

Contact resistance of low-temperature carbon nanotube vertical interconnects

August 20, 2012
Author(s)
Ann C. Chiaramonti Debay, Sten Vollebregt, R. Ishihara, Hugo Schellevis, Kees Beenakker
In this work the electrical contact resistance and length dependant resistance of vertically aligned carbon nano- tubes (CNT) grown at 500 °C with high tube density (1011) are investigated by measuring samples with different CNT lengths. From scanning

Mass spectrometry quantification of clusterin in the human brain

August 20, 2012
Author(s)
Junjun J. Chen, Meiyao M. Wang, Illarion V. Turko
A multifunctional glycoprotein clusterin has been associated with late-onset Alzheimer’s disease (AD). This finding should prompt further investigation to define the role of clusterin in AD phenotypes. For that reason, the development of techniques to

Metrology for Nanosystems and Nanoelectronics Reliability Assessments

August 20, 2012
Author(s)
Yaw S. Obeng, Chukwudi A. Okoro, Joseph J. Kopanski
The traditional models and techniques for studying reliability in integrated circuits may not be appropriate for nanoelectronics and nanosystems. In this paper, we present an overview of a number of materials and metrology techniques currently under

INVESTIGATING THE MECHANISM OF ENZYME-CATALYZED RING-OPENING COPOLYMERIZATIONS

August 19, 2012
Author(s)
Matthew T. Hunley, Fahriye N. Sari, Kathryn L. Beers
As the research interest in degradable polymers has risen, an ever increasing number of manuscripts report the synthesis of copolymers through ring-opening copolymerization techniques. However, the mechanism of copolymerization remains unexplored. In

Transient Convection-Diffusion Modelling of Peak Temperature in Orthogonal Cutting

August 19, 2012
Author(s)
Timothy J. Burns, Steven P. Mates, Richard L. Rhorer, Eric P. Whitenton, Debasis Basak
Numerical finite-difference simulations of a two-dimensional transient fast convection-slow diffusion model of the temperature field in orthogonal cutting, due to Tlusty, have been shown to provide better predictions of the peak temperature during

CHARACTERIZING SUSTAINABILITY FOR MANUFACTURING PERFORMANCE ASSESSMENT

August 17, 2012
Author(s)
Mahesh Mani, Jatinder Madan, Jae H. Lee, Kevin W. Lyons, Satyandra K. Gupta
Manufacturing industries lack the measurement science and the needed information base to measure and effectively compare performances of manufacturing processes, resources and associated services with respect to sustainability. The current use of ad-hoc

Photoluminescence Polarization in Strained GaN/AlGaN Core/Shell Nanowires

August 17, 2012
Author(s)
G. Jacopin, L. Rigutti, S. Bellei, P. Lavenus, F. H. Julien, Albert Davydov, Denis Tsvetkov, Kristine A. Bertness, Norman Sanford, John B. Schlager, M. Tchemycheva
The polarization properties of GaN/AlGaN core/shell nanowire (NW) heterostructures have been investigated using polarization resolved micro-photoluminescence (µ-PL) and interpreted in terms of a strain dependent 6x6 k.p theoretical model. The NW

Design and Fabrication of a Three-DoF MEMS Stage Based on Nested Structures

August 15, 2012
Author(s)
Yong Sik Kim, Nicholas G. Dagalakis, Satyandra K. Gupta
This paper presents the design, fabrication and testing of a Micro Electro Mechanical Systems (MEMS) based positioning stage which is capable of generating translational motions along X, Y and Z axes, respectively. For this purpose, two existing 1 Degree

Optical isolator using an atomic vapor in the hyperfine Paschen-Back regime

August 15, 2012
Author(s)
Svenja A. Knappe, L. Weller, K.S. Kleinbach, M.A. Zentile, I.G. Hughes, C.S. Adams
A light, compact optical isolator using an atomic vapor in the hyperfine Paschen-Back regime is presented. Absolute transmission spectra for experiment and theory through an isotopically pure 87Rb vapor cell show excellent agreement for fields of 0.6 T. We
Displaying 22651 - 22675 of 73783
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