Advances in Electronics and Electron Physics, Vol. 35 by L. Marton (ed.)

By L. Marton (ed.)

This quantity comprises overview articles overlaying a vast variety of themes in picture processing and research. the themes coated comprise snapshot research - which has united and harmonized a number of heterogeneous fabric; modern methods to the Fourier remodel; quantity theoretic transforms, that are rather appealing for discrete, finite signs; using the Wigner distribution - which encodes either spatial and spectral details, for snapshot filtering; and functions of the idea that of data strength. those up to date surveys are meant to supply the reader with entry to the newest leads to the super energetic box of photograph technological know-how.

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5 l ) with permission o f P h ~ s Flitiris. When the technique of Blais and Fowler was used, and thevelocity data were extrapolated back to the electrode, it was found that they then fell somewhere near where corresponding data taken in the electrostatic breakdown apparatus would have fallen. However, their trend more nearly indicated that the velocity has a q 2 p - " 2 dependence than the 'pp-' dependence found in the breakdown wave apparatus and expected by theory. In Fig. 39 they are plotted against this new parameter.

3 m long and of fairly constant speed. The electron speed calculated from this experiment was found to be less than the value found by previous methods, indicating that it is smaller than the velocity of advance of the luminous wave front, as it should be. By introducing an electric field probe into the flow, Mills et al. 28 x lo5 V/m. 5 M H , they searched for rf fields around the apparatus. 3 m down the sidearm, signals for E, and EB were detected as having approximately one fourth the magnitude of the signals for EZ.

They used a transverse microwave cavity to acquire data on the electron concentration (Fig. ; of final electron concentration in the front (Fig. 33). From their work they concluded that the precursor exhibits a wavelike structure with a definite electron density front; that the rise length of electron concentration as well as the average electron concentration behind the front are dependent on both the discharge field and ambient pressure; that the rise length and precursor velocity varied monotonically with the parameter E/p; that the precursor begins propagating down the tube prior to the main discharge, immediately (time resolution unspecified) upon application of the high voltage to the electrodes; and that currents of the order of one ampere were found to be distributed throughout the precursor electron density distribution.

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