New PDF release: Advances in Electronics and Electron Physics, Vol. 1

By L. Marton (Ed.)

ISBN-10: 0120145014

ISBN-13: 9780120145010

This quantity comprises evaluation articles overlaying a huge variety of issues in photograph processing and research. the themes coated contain photo research - which has united and harmonized a bunch of heterogeneous fabric; modern techniques to the Fourier remodel; quantity theoretic transforms, that are fairly appealing for discrete, finite indications; using the Wigner distribution - which encodes either spatial and spectral info, for picture filtering; and functions of the concept that of knowledge power. those updated surveys are meant to supply the reader with entry to the newest ends up in the tremendous energetic box of photograph technology.

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Extra resources for Advances in Electronics and Electron Physics, Vol. 1

Example text

Emission in Accelerating Fields Positive potentials applied to the diode anode will provide an increasing anode current, first in accord with the Langmuir-Child space charge 38 ALBERT S. EISENSTEIN relationship and at higher voltages, following a Schottky type of behavior. Emission in the Schottky region is generally compared with the characteristic predicted for a clean metal surface. --ELcctron emission from (BnSr)O cathode in a retarding field showing the deficiency of low energy electrons. tion $t by an amount, A+ = 6 E h plot of In j , vs.

If the semiconductor is of the N-type, the direction of low conductivity is from the metal into the semiconductor. An examination of Fig. 10 shows that the application of an electric field in the direction to induce electrons to flow from the metal into the semiconductor leaves the barrier height unchanged until the field becomes sufficient to promote Schottky emission or barrier penetration. Thus, no appreciable increase of current accompanies the increase of electric field. A field applied in the opposite direction raises the energy levels of the semiconductor relative to the levels in the metal and thus decreases the barrier height to current flow in this direction.

3, from a FIG. -Photoelectric current from oxide cathodes as a function of incident higher equilibrium value of nb in energy. the solid solution than in the pure oxide. This must be regarded as speculative until a value for x or Ae alone, has been obtained for BaO. 3. Emission in Retarding Fields The distribution in energy of electrons emitted from a cathode may be studied using a magnetic or electrostatic velocity selector, or more easily by measuring the diminution in anode current as the anode is made increasingly negative.

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Advances in Electronics and Electron Physics, Vol. 1 by L. Marton (Ed.)

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