Abstract: A light source consisting of a straight tube fluorescent lamp is mounted almost in parallel with a desk work surface to be illuminated. A housing enclosing this light source is mounted, and this housing is fixed on the surface to be illuminated by means of two support members. The housing has an opening section at its lower position, and a light controller which is formed of two kinds of prism plates is fitted in the opening. The light emitted from the light source is refracted by the prism plates. These beams of light are converted by the above light controller to two types of light components which run almost in parallel with the first and second directions. One of the beams of light falls from the right top in front of the person at desk to the illuminated surface region in proximity to the left hand of the person at desk, and the other beams of light fall from the left top in front of the person at desk to the illuminated surface region in proximity to the right hand of the person at desk.

Abstract: A process for preparing photopolymerizable photosensitizing compounds which comprises addition reacting a specific benzophenone derivative with an alkylene oxide to obtain a hydroxyl group-containing reaction product which is then esterified with an unsaturated carboxylic acid or addition reacted with glycidyl acrylate; the photopolymerizable photosensitizing compounds; and photocurable compositions comprising the photopolymerizable photosensitizing compound.

Abstract: A semipermeable polymeric membrane which essentially consists of modified poly (arylether-sulfone) having halomethyl groups and/or quaternized nitrogen atom-bearing groups. The membrane can be prepared by casting the polymer solution in a selected solvent or a mixture of suitable solvents on a surface, evaporating a portion of the solvent, and immersing the resulting film into a suitable non-solvent. The membrane is excellent in performance, such as water flux, and permeation selectivity, so that it can be used as a reverse osmosis membrane, an ultrafiltration membrane, and the like.