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tunneling

 
Dictionary: tun·nel·ing   (tŭn'ə-lĭng) pronunciation
n.
In quantum mechanics, the passing of a particle through a seemingly impenetrable barrier without a cause that is explainable by classical physics.


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In physics, the passage of a particle through a seemingly impassable energy barrier. Though a particle's energy may be too low to surmount a barrier in classical physics, the particle may still cross the barrier as a consequence of its quantum-mechanical wave properties. An important application of this phenomenon is in the operation of the scanning tunneling microscope.

For more information on tunneling, visit Britannica.com.

Transmitting data structured in one protocol within the format of another. See tunneling protocol.

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Investment Dictionary: Tunneling
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An illegal business practice in which a majority shareholder or high-level company insider directs company assets or future business to themselves for personal gain. Actions such as excessive executive compensation, dilutive share measures, asset sales and personal loan guarantees can all be considered tunneling. The common thread is the loss to the minority shareholders, whose ownership is lessened or otherwise devalued through inappropriate actions that harm the overall value of the business.

Investopedia Says:
This risk is especially prevalent for investors in emerging markets, where government and regulatory controls may not be sufficient to stop the practice from occurring, often under legal guises. The practice is not reserved to moderately advanced economies; many instances can be found in advanced economies, especially those under systems of "civil law". The U.S. legal system is rooted in "common law", which provides broad enforceable laws with simple maxims like "fairness" and "for the common good". Under civil law, the letter of the law is the most respected measure, so would-be tunnelers can pass an act of tunneling off under certain technicalities, which often hold up in court.

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Columbia Encyclopedia: 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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drifting (mining engineering)
trackless tunneling (mining engineering)
Josephson effect (cryogenics)

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