By L. Marton (Ed.)
This quantity comprises assessment articles overlaying a large variety of issues in photograph processing and research. the themes lined comprise snapshot research - which has united and harmonized a bunch of heterogeneous fabric; modern techniques to the Fourier rework; quantity theoretic transforms, that are quite appealing for discrete, finite signs; using the Wigner distribution - which encodes either spatial and spectral details, for snapshot filtering; and purposes of the concept that of data strength. those up to date surveys are meant to supply the reader with entry to the newest ends up in the tremendous energetic box of photograph technological know-how.
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Extra info for Advances in Electronics and Electron Physics, Vol. 1
The absence of activation centers in the layers of coating adjacent to the base metal or a vacuum layer caused by a poor mechanical bonding of the coating may provide a low conductivity, series element to the flow of current and thus influence the cathode's behavior. 1 . Composition Some years ago, Arnold4' reported the presence of the compound BaPtOa at the interface of cathodes prepared on a platinum base metal, although the method used in its identification was not clear. Use of the technique of x-ray diffraction analysis for interface identification was first reported by R o o k ~ b who y ~ ~found ~ ~ barium ~ aluminate, BaAl201, at the interface for a base metal of nickel alloyed with 2% of aluminum.
IV. PROPERTIES OF THE COMPLETE CATHODE In this section we shall consider those properties of the cathode which are only studied using the complete cathode, base metal, interface and oxide, and may be subject to the influence of more than one of these components. 1. Thermionic Emission Although the oxide coated cathode exhibits many interesting physical characteristics, the considerable expenditure of effort already devoted to studies of these properties is due to but one, the cathode’s ability to supply a copious thermionic emission of electrons at a relatively low temperature.
EISENSTEIN presence of an interface layer is frequently confirmed by its color. The silicate, titanate, and aluminate interfaces are gray; the chromium interfaces are green, brown, or black and interfaces on molybdenum are blue or red. BalSiOr is normally colorless, hence its gray appearance a t the interface may be due t o interspersed, finely divided nickel particles formed by evaporation into the porous coating. Fig. 6 shows a group of cathode samples. On the left is an uncoated sleeve of a silicon-nickel alloy adjacent to which is a similar carbonate coated sleeve.