$\alpha$,$\beta$,$\varepsilon$ type copper phthalocy $\alpha$,$\beta$,$\varepsilon$ type copper phthalocyanine(CuPc) pigment was purified by a simple train sublimation technique. The layered photoconductor was made with $\varepsilon$ type CuPc as a carrier generation layer(CGL) and polyvinly carvazol(PVCz) as a carrier transport layer(CLT). A CGL of CuPc was electrochemical deposited on an Al substrate used as cathode in pigment dispersion solutions. a CTL of PVCz pwas spin coated on $\varepsilon$ type CuPc thin film by a spin coater. The effect of sonication time, electrophotographic property of the layered photoconductor were studied with surface coverage, surface potential and sensitivity.

In analysing the Image quality, one of the most important things to be considered is the granularity at a given emulsion speed. To enhance the image quality, the granularity should be lowered by the suitable methods, such as controlling the design of emulsion, grain size and structure, the distribution state of grains in the emulsion, etc. In this paper, the relations between the AgX grain structure and granularity are studied as a way of lowering granularity. According to the results, it is found that the grain structure is a very important factor for determining the granularity characteristics.istics.

It is well known that viologens such as 1.1 - disubstituted 4, 4` - bipyridinium salts and those used as redox indicator, herbicide and electrocheromic display device because those possess the lowest redox potential in any organic system. Viologen salts produced reversible high blue color under the influence of radical cation by photoreduction This study is related to the synthesis of viologen derivatives and the photoreduction property in water solution stats and the polar aprotic polyvinylpyrrolidone(PVP) matrix.

This paper presents a simple algorithm to obtain three dimensional information of an object. In the preprocessing of the stereo matching,feature point informations of stero image must be less sensitive to noise and well liked the correspondance problem. This paper described a simple technique of struture feature extraction of 3-D object and used edge-end point expanding method for unconnected line instade of Hough transform. The feature such as corner point and their angles are used for matching problem. The experimental results show that the described algorithm is a useful method for stereo correspondence problem.