tunneling


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tunneling,

quantum-mechanical effect by which a particle can penetrate a barrier into a region of space that would be forbidden by ordinary classical mechanics. Tunneling is a direct result of the wavelike properties of particles; the wave associated with a particle "decays" through a barrier—the amplitude decreases—but the amplitude of the wave on the other side of the barrier is large enough that there is a finite probability of finding the particle there. The theory of tunneling has been successfully applied to understand alpha decay, in which a heavy nucleus decays into a lighter nucleus and emits an alpha particle (helium nucleus).
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tunneling

[′tən·əl·iŋ]
(quantum mechanics)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

tunneling

Transmitting data structured in one protocol within the format of another. See tunneling protocol.
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References in periodicals archive ?
In previous studies, there were few cases of the introduction and studies of above-crossing tunneling. In addition, the case of rectangular tunneling is almost nowhere to be found.
The surprising result is that most of the time, tunneling photons arrive at a detector before those traveling through air.
To better understand the energy changes in deep tunnels during TBM tunneling, the current study took the headrace tunnel #1 at the Jinping II hydropower station when the TBM passed through the top pilot tunnel section as a case study.
* Cranberry Tunnel (Currently serves the A, C subway lines)- Service between Lower Manhattan and JFK & Jamaica using: the AirTrain /JFK route, the convened Atlantic Branch, new tunneling in Brooklyn, the Cranberry Street Tunnel, and MTA-NYCT Fulton Line (A/C).
Tunneling is a non-native approach that links one FC SAN to another.
The idea that quantum tunneling can occur in sufficiently small magnets also has important technological implications as a fundamental barrier to ongoing efforts to pack increasing amounts of information on magnetic tapes or disks.
With the tip over the site, which served as the second terminal, the researchers varied the voltage between the tip and the surface while monitoring the changing tunneling current.
A tunneling microscope uses the tiny electric current flowing between a probe tip and a sample only a few atomic diameters away to trace out a contour map of the sample's surface atoms.
Unlike the electron microscopes and their visible-light predecessors, the scanning tunneling microscope does not produce an image by focusing beams of wave/particles.
Now a team of researchers reports the design and construction of a special "scanning tunneling" microscope that can pick out the atomic-scale bumps and hollows on a water-covered graphite surface.
Scanning tunneling microscopes were developed a few years ago by scientists at IBM Zurich in Switzerland (SN: 4/2/83, p.