907 resultados para injection
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S/N 017-024-01531-8 (GPO)
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Mode of access: Internet.
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Mode of access: Internet.
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Mode of access: Internet.
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"Contract no. AF 33(616)-7661, Project no. 7064, Task no. 70169."
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"Army Ordnance contract no. DA-04-495-Ord-19."
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Mode of access: Internet.
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Published cooperatively by the Department of Energy and Natural Resources, Illinois State Geological Survey, Illinois State Water Survey, and Hazardous Waste Research and Information Center.
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"HWRIC RR 008." -- Cover.
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Published in London in 1771 and 1808.
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Dissertation I. On the question, Is there any communication from the stomach to the bladder, more direct than that through the circulating system and the kidneys? Which obtained the Boylston premium in 1819.--Dissertation II. On the question, Can medicinal substances be safely and advantageously introduced into animal bodies through the medium of the veins? Which obtained the Boylston premium in 1821.
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Includes indexes.
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Includes index.
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"December 1977."
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Within the ballistic transport picture, we have investigated the spin-polarized transport properties of a ferromagnetic metal/two-dimensional semiconductor (FM/SM) hybrid junction and an FM/FM/SM structure using quantum tunnelling theory. Our calculations indicate explicitly that the low spin injection efficiency (SIE) from an FM into an SM, compared with a ferromagnet/normal metal junction, originates from the mismatch of electron densities in the FM and SM. To enhance the SIE from an FM into an SM, we introduce another FM film between them to form FM/FM/SM double tunnel junctions, in which the quantum interference effect will lead to the current polarization exhibiting periodically oscillating behaviour, with a variation according to the thickness of the middle FM film and/or its exchange energy strength. Our results show that, for some suitable values of these parameters, the SIE can reach a very high level, which can also be affected by the electron density in the SM electrode.