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Displaying 21251 - 21275 of 73930

Direct Observation of Zitterbewegung in a Bose-Einstein condensate

July 3, 2013
Author(s)
Lindsay J. LeBlanc, Matthew Beeler, Karina Jimenez-Garcia, Abigail R. Perry, Seiji Sugawa, Ross Williams, Ian B. Spielman
Zitterbewegung, a force-free trembling motion first predicted for relativistic fermions like electrons, was an unexpected consequence of the Dirac equation's unification of quantum mechanics and special relativity. Though the oscillatory motion's large

Measurements of effective diffusion coefficients of helium and hydrogen through gypsum

July 3, 2013
Author(s)
Jiann C. Yang, William M. Pitts, Marco G. Fernandez, Kuldeep R. Prasad
An experimental apparatus, which was based on the ¿-scale garage previously used for studying helium release and dispersion in our laboratory, was used to obtain effective diffusion coefficients of helium and hydrogen (released as forming gas for safety

Strong equivalence of reversible circuits is coNP-complete

July 2, 2013
Author(s)
Stephen P. Jordan
It is well-known that deciding equivalence of logic circuits is a coNP-complete problem. As a corollary, the problem of deciding weak equivalence of reversible circuits, i.e. ignoring the ancilla bits, is also coNP-complete. The complexity of deciding

A Prescription for Sub-Millimeter-Wave Transistor Characterization

July 1, 2013
Author(s)
Dylan F. Williams, Adam C. Young, Urteaga Miguel
We present an approach for characterizing transistors embedded in microstrip lines formed on a thin bisbenzocyclobutene-based (BCB) monomers film at sub-millimeter-wave frequencies. We demonstrate the approach to 750 GHz and estimate the uncertainty of the

Calibration-Kit Design for Millimeter-Wave Silicon Integrated Circuits

July 1, 2013
Author(s)
Dylan F. Williams, Phillip Corson, Sharma Jahnavi, Krishnaswamy Harish, Tai Wei, George Zacharias, Ricketts David, Watson Paul, Dacquay Eric, Voinigescu Sorin
We study and present design guidelines for thru-reflect-line vector-network-analyzer calibration kits used for characterizing circuits and transistors fabricated on silicon integrated circuits at millimeter-wave frequencies. We compare contact-pad designs

Capturing Rare Cells From Blood Using a Packed Bed of Custom-Synthesized Chitosan Microparticles

July 1, 2013
Author(s)
Chandamany Arya, Jason Kralj, Kunqiang Jiang, Matt S. Munson, Thomas Forbes, Don L. DeVoe, Srinivasa R. Raghavan, Samuel Forry
Uniform multifunctional chitosan microparticles were produced in large numbers using a simple and inexpensive microtubing arrangement. The particles were functionalized through both physical encapsulation of carbon black, to attenuate autofluorescence, and

Conditions for two-photon interference with coherent pulses

July 1, 2013
Author(s)
Yong-Su Kim, Oliver T. Slattery, Paulina Kuo, Xiao Tang
We report experiments on two-photon interference between temporally non-overlapping weak coherent pulses. While the single-photon interference is washed out, the two-photon interference shows a Hong-Ou-Mandel dip with visibility of 0.50±0.09, which shows

July 2013 SRM Spotlight

July 1, 2013
Author(s)
Regina R. Montgomery
The SRM Spotlight is a newsletter published by the Office of Reference Materials for users of NIST standard reference materials. The Spotlight announces new reference materials and provides information about their use. In addition, this newsletter contains

Parallel Geometric Classification of Stem Cells by Their 3D Morphology

July 1, 2013
Author(s)
Derek Juba, Antonio Cardone, Cheuk Y. Ip, Carl Simon Jr., Christopher K. Tison, Girish Kumar, Mary C. Brady
Autologous stem cells show great promise for tissue engineering as they can regenerate diseased or damaged tissue, without requiring an organ donor or causing immune rejection. A primary goal of regenerative medicine is to identify methods for controlling
Displaying 21251 - 21275 of 73930
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