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Warn moderators| Author : | Topic: Q.M. Notes | Bottom |
| saucer admin Posts : 673 A Good Tautology is Hard to Find!  |
-  CyberneticsNorbert Wiener defined "cybernetics" as the science of transmitting messages between man and machine, or from machine to machine. The term cybernetics has its roots in the Greek word for "steersman" or "governor," and Wiener's use of it suggests how people interact with machines through a controlling device, such as a steering mechanism. Wiener's remarkable insight, which is the premise behind all human-computer interactivity and interface design, is that human communication should be a model for human-machine and machine-to-machine interactions. Wiener claims that the quality of man-machine communication influences man's inner well-being. His theory of cybernetics was meant to improve the quality of our existence in a technological society, where people are increasingly reliant on machines, and where interactions with machines are the norm. The design of machines, and their ability to respond effectively to us, has a direct impact on the social condition. - --Last edited by saucer on 2007-03-16 22:10:46 -- |
| saucer admin Posts : 673 A Good Tautology is Hard to Find! |
-   - --Last edited by saucer on 2007-05-06 09:13:06 -- |
| zee Posts : 115 |
In classical mechanics the motion of a charged particle is not affected by the presence of magnetic fields in regions from which the particle is excluded. The motion of classical particles emitted by the source S is not affected by the magnetic field B because the particles can not enter the region of space where the magnetic field is present. For a quantum charged particle there can be an observable phase shift in the interference pattern recorded at the detector D. This phase shift results from the fact that although the magnetic field is zero in the space accessible to the particle, the associated vector potential is not. The phase shift depends on the flux enclosed by the two alternative sets of paths a and b. But the overall envelope of the diffraction pattern is not displaced indicating that no classical magnetic force acts on the particles. The Aharonov-Bohm effect demonstrates that the electromagnetic potentials, rather than the electric and magnetic fields, are the fundamental quantities in quantum mechanics |
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