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Zoology and wildlife conservation

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Abstracts » Zoology and wildlife conservation

Negative Poisson's ratios as a common feature of cubic metals

Article Abstract:

A negative Poisson's ratio is observed for 69% of the cubic elemental metals when stretched along the [110] direction. For these metals, there are correlations between the work function and the extremal values of Poisson's ratio for the stretch direction. This can be explained using a simple electron-gas model. There is practical significance associated with the existence of negative Poisson's ratios for the cubic metals, particularly as a negative Poisson's ratio reverses the compensation effects of positive Poisson's ratios on the volume and area changes created by a uniaxial stress.

Author: Baughman, Ray H., Shacklette, Justin M., Zakhidov, Anvar A., Stafstrom, Sven
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
Numerical analysis, Residual stresses, Poisson's equation

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Probing carrier dynamics in nanostructures by picosecond cathodoluminescence

Article Abstract:

An original time-resolved cathodoluminescence set-up is used to describe carrier dynamics within single gallium-arsenide-based pyramidal nanostructures with a time resolution of 10 picoseconds and a spatial resolution of 50 nanometres. The behaviour of such charge carriers could be useful for evaluating elementary components in quantum computers, optical quantum gates or single photon sources for quantum cryptography.

Author: Merano, M., Crottini, A., Renucci, P., Malko, A., Kapon, E., Sonderegger S., Collin, S., Pelucchi, E., Baier, M.H., Deveaud B., Ganiere, J.-D.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2005
Cathodoluminescence, Quantum computing

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Super-tough carbon-nanotube fibres

Article Abstract:

The authors discuss the study on carbon-nanotube fibers. They report that these fibers are extraordinary composites which can be woven into electronic textiles.

Author: Ferraris, John P., Collins, Steve, Dalton, Alan B., Munoz, Edgar, Razal, Joselito M., Ebron, Von Howard, Coleman, Jonathan N., Kim, Bog G., Baughman, Ray H.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2003
Ireland, TEXTILE MILL PRODUCTS, Textile Mills, Usage, Composition, Composite materials, Fibers, Properties, Carbon compounds, Chemical properties, Fibres

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Subjects list: Research, United States, Nanotechnology
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