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Zoology and wildlife conservation

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Abstracts » Zoology and wildlife conservation

Pattern formation in semiconductors

Article Abstract:

Nonlinear generation and recombination process of free carriers in semiconductors can lead to non-equilibrium phase transitions. Microwaves were used to apply an electric field to semiconductor samples without the use of electrical contacts. Circular spots of enhanced free electron density were formed in thin n-type gallium arsenide (GaAs). These currentless patterns involve only type of charge carrier. The findings suggest that the microwave induced pattern formation has a physical background the same as that of current filamentation.

Author: Novak, V., Bel'kov, V.V., Hirschinger, J., Niedernostheide, F.J., Ganichev, S.D., Prettl, W.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
Observations, Electric fields, Microwaves

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Vestal voyagers unveiled

Article Abstract:

Astronomers have obtained spectral evidence showing that certain asteroids and meteorites that have been found on Earth originated from the asteroid Vesta. RP Binzel and S Xu found that certain Vesta-family objects had visual and near-infrared spectra similar to that of Vesta and the eucrites. These ejecta managed to escape from the parent asteroid's orbit through collisions that launched them at very large ejection velocities which, coupled with the effects of Jupiter's gravity, enabled them to reach the earth.

Author: Mckinnon, William B.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993
Asteroids, Vesta (Asteroid)

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Non-thermal melting in semiconductors measured at femtosecond resolution

Article Abstract:

Research is presented concerning the use of ultrafast time-resolved optical spectroscopy to investigate chemical, physical and biological reactions which are greatly influenced by deterministic, directed motions of atoms.

Author: Rousse, A., Rischel, C., Fourmaux, S., Uschmann, I., Sebban, S., Grillon, G., Balcou, Ph., Forster, E., Geindre, J.P., Audebert, P., Gauthier, J.C., Hulin, D.
Publisher: Macmillan Publishing Ltd.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2001
Letter to the Editor

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Subjects list: Research, Usage, Semiconductors, Spectrum analysis, Spectroscopy
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