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Bulky CuAlS2 single crystals were grown by traveling‐heater method (THM) using indium solvent, and shown to have small indium content and represent solid solutions CuAl1–xInxS2 of CuAlS2‐CuInS2 system The composition with x = 0.24 has been studied by spectroscopic ellipsometry at room temperature. The principal components of dielectric function, ϵ⊥ (E⊥C) and ϵ∥ (E∥C), have been obtained in the spectral range 0.75‐6.0 eV. The critical point analysis has been performed and the optical transitions responsible for the observed critical points have been assigned by taking account of the available electronic band structures of CuAlS2 and CuInS2. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Comvination factor of corona pulse generation time is neglected in analog signal processing methods, or affects of electric field due to surface of electrode are shown without quantitative analysis. This paper describes relation between effect of surface curvature of electrodes and fluctuation of DC corona discharge measured in sequency domain using discrete Walsh transformation.In digital signal processing, both amplitude and time duration of the measured corona pulses are transformed to the signal with the constant value. And after, the signal is transformed by the Walsh sequences regions.Corona pulses which are generated from electrodes set up large surface curvature have more wide frequency spectrum than ones of the small curvature. It is clear that surface curvature have an effect of fluctuation from proposing the digital processing by use of the Walsh transformation.