Ken Kazama

Characteristics of Daily Activities at Late Night of Female Students

Many goods and services at late night have appeared in the market. Therefore, the objective of this study was to clarify the characteristics of daily activity at late night of young people who were active at late night.The method of this study was to survey the daily activity of female student from 10p.m. to 5a.m. the next day on weekdays and holidays. The main results were as follows.(1) The difference among samples had stronger influence on the obtained data than the difference within samples.(2) The time of activities at late night was longer in students than in whole Japanese. On the rate of samples who were astir at late night, holidays was twice rate of weekdays.(3) The correlation of between bedtime and each item of daily activities for a whole day was high in the items of the free time, low in the items of the bound time and half in the indispensable time. The correlation between weekdays and holidays was also found.(4) Activities at late night were classified to five factors. The characteristics of each factor depended on the types of communications media, for example, telephone and communication.(5) The activities, which were mostly active in late night, were telephone, computer and rest. Contrary, the items of low rate of activity at late night were work and transportation.(6) The correlations among activities were found. The character of samples related to transportation were clarified. Their character was self-assertive and aggressive.

New Solvent Scouring for Raw Wool

We developed the new system of wool scouring which used the organic solvent. The important results obtained from the system are as follows.(1) I, I, I-trichloroethane is suitable for wool scouring with characteristic conditions for scouring, solvent removal and separating by-product.(2) Solid matters in effluent come to be reduced to on-tenth of conventional method.(3) The scoured wool obtained by our new system is longer in fiber length, less neps in top and higher yield in top-making process than the traditional system.(4) Two by-products, grease and fertilizer, are superior in quality.(5) Scouring cost is reduced to 48% of conventional case.

Unevenness in the Appearance of Spun Yarn

To clarify the substance of the sensory test of unevenness with a black board, this article makes an analysis which includes some sensory factors. The present installment suggests and discusses theoretically two criteria by which to represent apparent unevenness, i.e., the over-level ratio and length distribution of an uneven area. It also introduces an ideal yarn which has a more definite physical meaning than the usual random slivers. Over-level ratio R and length distribution ψ(l) of the ideal yarn are obtained as follows: R=e-n∑ (n)n/n! ψ(l)={ψ(Δl)}l/Δlwhere n : mean number of fibers in a yarn n0 : given level l : given length of an uneven area Δl : a small length of uneven area ψ(Δl)=∑ [(e-n nnM/nM!/ ∑ e-nnn/n!){∑ e-λΔl ×(λΔl)kb/kb!(∑ <kf=kb-(nM-n0) e-λΔl (λΔl)kf/kf!)}] λ : input density of the front end of a fiber.Examples of calculation are given, the relation between U% and the over-level ratio is shown, and the mean length of an uneven area and the ideal value of the Imperfection Index are calculated for practical application.