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金沢大学人間社会研究域学校教育系, This paper describes the method evaluating the appearance of fabric-wrinkling replicas objectively by image processing. Results indicate that the wrinkle can be reliably measured using the distribution of gray level and the ratio of surface area, the ratio of X-direction length and the one of Y-direction length of surface profiles. All parameters with wrinkling fall on good logarithmic functions, which have high correlation coefficients. All parameters used can quantify the wrinkle of replicas with AATCC grades. The profile lines of surface are also analyzed with the method of Fast Fourier Transform. © 2008 The Textile Machinery Society of Japan.

Corrosion and passivation behavior of carbon steel in deionized water with or without dissolved oxygen (DO) was investigated by ellipsometry. It was found that a 4 to 5 nm thick passive film, whose refractive index was N2=3.0−0.4i, was formed on the surface of carbon steel in oxygen containing flowing water. The film thickness was smaller with higher DO concentration and larger flowing velocity. In stagnant DO containing water, the passive film was not stable and small corrosion pits occurred. In deaerated water, the passive film disappeared in a relatively short time and another type of film grew. The characteristics of the film formed in deaerated system was different from that of the passive film. It's refractive index was N2=2.0−0.2i and the thickness was 15 to 30 nm or more. This film was considered to be a corrosion product film which grew as corrosion proceeded. The film thickness was especially large in stagnant system.