The method of calculating the direct illuminance and the shadow factor in the shadow which is produced on the illuminated plane by a horizontal disk under the condition that a diffused linear light source is kept in a horizontal or vertical position was discussed in our previous report.
In this paper we describe and discuss the results of some calculations on the shadow factor when the diffused linear light source is kept in a horizontal position.
First, with the light source fixed, the shadow factor on the illuminated plane under various positions of a disk is calculated.
Then, with the disk fixed, variations of the shadow factor at the illuminated point which is directly under a disk when the light source is moved are calculated.
From these results, the methods of predicting the shadow zone and the suitable position of a light source to make the shadow as little as possible can be obtained.

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A mass spectrometer was used to measure diffusion coefficionts, permeabilities and solubilities of hydrogen in some kinds of fused quartz tubes, which are now used for newly developed lamps.
The values obtained for diffusion coefficient at 800°C is 2-3×10^-6cm²/sec, and the activation energy of diffusion at 400-800°C is 11.6 Kcal/mol. These values are in good agreement with other reported values.
Precise measurements at elevated temperatures exceeding 800°C generally showed an unusual fall off of diffusion coefficient, while permeabilities showed monotonical increasing, and solubilities, which were calculated from diffusion coefficient and permeability, displayed abrupt rise.

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An accelerated photo-fixation and decomposition of unfavorable and toxic materials contained in water was mentioned as a method for water polltuion control.
The synthetic polymers, which was co-grafted with unsaturated and carbonyl compounds and the polymers contained a chromophoric compounds were proposed as a degradable plastics under environmental condition

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