Abstract: An area determination apparatus (2000) acquires three-dimensional facility data (20). The three-dimensional facility data (20) is three-dimensional data of a target facility including a plurality of segments. The area determination apparatus (2000) determines a designated segment, which is a segment designated in an input screen (10) including an image of the target facility. The area determination apparatus (2000) determines, as a monitoring area or a non-monitoring area, a three-dimensional area that is determined based on three-dimensional segment data (22) of the designated segment.

Abstract: A photosensitive lithographic printing plate having a photosensitive resin layer formed on an aluminum substrate subjected to electrolytic surface roughening in nitric acid or in an electrolyte composed mainly of nitric acid and further to anodic oxidation treatment, wherein the photosensitive resin layer is made of a photopolymerizable composition comprising (A) an addition-polymerizable ethylenically unsaturated bond-containing monomer, (B) a photopolymerization initiator, and (C) a polymer binder, wherein the addition-polymerizable ethylenically unsaturated bond-containing monomer (A) contains a phosphate compound having at least one (meth)acryloyl group.

Abstract: A photosensitive composition comprising (1) a compound having at least one addition-polymerizable ethylenically unsaturated double bond, (2) an acidic vinyl copolymer soluble or swellable in alkaline water, which contains, in its molecule, a vinyl monomer having an aromatic hydroxyl group, as a constituting unit, (3) a photopolymerization initiator, and (4) a diazo resin, wherein the diazo resin is a copolycondensed compound which contains, in its molecule, an aromatic compound having a carboxyl group and/or a hydroxyl group, and an aromatic diazonium compound, as constituting units.

Abstract: A photopolymerizable composition for a photosensitive lithographic printing plate, comprising (A) addition-polymerizable ethylenically unsaturated bond-containing monomers, (B) a photopolymerization initiator system and (C) a polymer binder having carboxyl groups in its molecule, wherein the addition-polymerizable ethylenically unsaturated bond-containing monomers (A) contain a specific monomer which is a phosphoric acid ester compound (A-1) having at least one (meth)acryloyl group and/or a compound (A-2) of the following formula ##STR1## wherein R.sup.1 is a hydrogen atom or a methyl group, X is a C.sub.1-6 alkylene group which may be branched and may be substituted by halogen, and m is an integer of at least 2, and the polymer binder (C) having carboxyl groups in its molecule, is a compound having at least a part of the carboxyl groups reacted with an alicyclic epoxy group-containing unsaturated compound.

Abstract: An unsaturated group-containing urethane compound of the following formula (I): ##STR1## wherein X is a C.sub.1-20 alkylene group which may be branched, and R.sup.1 is a group of the following structural formula (A) or (B): ##STR2## wherein each of R.sup.2 and R.sup.3 which are independent of each other, is a hydrogen atom or a methyl group, and Y is a C.sub.1-6 alkylene group which may be branched.

Abstract: Disclosed is a light-sensitive composition which comprises(A) a diazo resin and(B) an alkali-soluble and swellable polymer compound, said polymer compound being a vinyl copolymer containing, as a constitutional unit, 0.1 to 10 mole % of a structure derived from an ester of acrylic acid or methacrylic acid having an alkyl group with 8 or more carbon atoms.

Abstract: An optical information system is provided with an optical focussing device for adjusting a position of an objective lens. The optical focussing device is comprised of a photosensing unit to which a part of a light beam reflected from a disc and passed through the objective lens is projected through a semitransparent mirror and a cylindrical lens. The photosensing unit for detecting a shape of the projected image of the light beam is assembled by a first photo-cell having a narrow photoelectric surface extending in the direction of movement of the projected image and second and third photo-cells each having a rectangular photoelectric surface closely disposed to the first photo-cell surface. The second and third photo-cells are connected to a adder to sum signals detected by both cells. The adder and the first photo-cells connected to a differential amplifier to compare the signal detected by the first photo-cell with the output of the adder.