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Displaying 33426 - 33450 of 73697

Control of MEMS Nanopositioners With Nano-Scale Resolution

November 10, 2006
Author(s)
Jason J. Gorman, Yong Sik Kim, Nicholas Dagalakis
Several approaches for the precision control of micro-scale positioning mechanisms, or MEMS nanopositioners, are presented along with initial experimental results which demonstrate nano-scale positioning resolution. The MEMS nanopositioners discussed in

Microfluidic Method for Thermal Cycling by Microwave Dielectric Heating

November 9, 2006
Author(s)
Pierre-Alain Auroux, Jayna J. Shah, James Booth, Mulpuri Rao, Laurie E. Locascio, Michael Gaitan
We report on temperature time domain and spectral measurements for on-chip microwave thermocycling. In particular we observe enhanced specificity of the heating of a targeted sample compared to conventional heating block-based thermocyclers. Spatial

Photopatterned Polyelectrolyte Multilayers for Cell Culture

November 9, 2006
Author(s)
Darwin Reyes-Hernandez, J. Brian Hutchison, Laurie E. Locascio, Michael Gaitan
Patterned two-dimensional cell cultures are increasingly important for constructing bioanalytical tools for cell and molecular biology to address questions about interactions, signaling, migration, and differentiation, among others. This contribution

Low Magnetic Moment PIN Diodes for High Field MRI Surface Coils

November 8, 2006
Author(s)
Pavel Voskoboynik, Ronald D. Joos, W E. Doherty, Ronald B. Goldfarb
Positive-intrinsic-negative (PIN) silicon diodes are commonly used in magnetic resonance imaging (MRI) coils to perform active or passive blocking and detuning, or to disable circuit functions. However, diode packages with large magnetic moments are known

PEM Fuel Cell Membrane Hydration Measurement by Neutron Imaging

November 8, 2006
Author(s)
D J. Ludlow, M K. Jensen, C M. Calebrese, G A. Eisman, S Yu, C Dannehy, Daniel S. Hussey
Neutron scattering experiments on a proton exchange membrane fuel cell wereperformed to assess the ability to quantify water in the membrane and electrode/gas diffusion layers. Previous studies have shown that liquid water is easily resolved within flow

Cleaning of carbon nanotubes near the p-plasmon resonance

November 7, 2006
Author(s)
Katie Hurst, Darryl A. Keenan, John H. Lehman, Anne Dillon
The cleaning of bulk carbon single-walled nanotubes (SWNTs) by use of a 248 nm excimer laser is verified with imaging, and quantitative evaluation of morphology and composition. A 5% change in responsivity of a pyroelectric detector coated with SWNTs is

Perspectives on the quantum Zeno paradox

November 7, 2006
Author(s)
Wayne M. Itano
As of October 2006, there were approximately 535 citations to the seminal 1977 paper of Misra and Sudarshan which pointed out the quantum Zeno paradox (more often called the quantum Zeno effect). In simple terms, the quantum Zeno effect refers to a slowing

A Versatile Gradient Substrate for Biofunctionalization

November 5, 2006
Author(s)
Nathan D. Gallant, Matthew Becker, Eric J. Amis
NIST has developed numerous platforms for characterizing the physical properties of sample libraries with orthogonal gradients using combinatorial methodologies. Extension of these methods includes the characterization of surfaces possessing well-defined

Fabrication and Mechanical Characterization of Carbon Nanotube Based Nanoknives

November 5, 2006
Author(s)
Gurpreet Singh, Paul Rice, Richard J. McIntosh, Roop L. Mahajan
A prototype microtome knife for cutting 100 nm thick slices of frozen-hydrated biological samples has been constructed using multiwalled carbon nanotubes (MWCNT). A piezoelectric-based 3-D manipulator was used inside a Scanning Electron Microscope (SEM) to

Design of an On-Chip Micro-Scale Nanoassembly System

November 3, 2006
Author(s)
Jason J. Gorman, Yong Sik Kim, Andras Vladar, Nicholas Dagalakis
In this paper, the design and proposed operation of a MEMS-based nanoassembly system is presented. The nanoassembly system is comprised of four nanomanipulators that can work independently or cooperatively. The design of the nanomanipulators will be
Displaying 33426 - 33450 of 73697
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