Abstract: Heat radiating fin plates in a curved shape are radially arranged on a heat radiating surface of a heat transfer plate, and a space is provided so as to be surrounded by inner edges of the heat radiating fin plates. The heat radiating fin plates have sidewalls formed with projections.

Abstract: An artificial soil structure includes at least one hydrophobic layer of hydrophobic particles provided in a soil. A particle size of the hydrophobic particles can be 2000 micrometers and less. The hydrophobic particles are sand and/or dirt treated with a water-repellent agent or hydrophobic particles having a high molecular weight polymer. An artificial water-retentive soil structure includes a soil block containing a water-retentive agent and a hydrophobic layer of hydrophobic particles provided on the soil block. A method of preventing land desertification includes the steps of placing a hydrophobic layer of hydrophobic particles in a soil at a prescribed depth from the earth surface and controlling the water content in said soil.

Abstract: A method of laying a road characterized by spraying and impregnating a roadbed with 1 g/m.sup.2 to 500 g/m.sup.2 of a liquid water-repellent agent and then laying a road on said roadbed wherein said liquid water repellent agent is fluid at ordinary temperatures and contains as the main ingredients one or more compounds chosen from among silane-type compounds and organopolysiloxane derivatives.

Abstract: An artificial soil structure includes at least one hydrophobic layer of hydrophobic particles provided in a soil. A particle size of the hydrophobic particles can be 2000 micrometers and less. The hydrophobic particles are sand and/or dirt treated with a water-repellent agent or hydrophobic particles having a high molecular weight polymer. An artificial water-retentive soil structure includes a soil block containing a water-retentive agent and a hydrophobic layer of hydrophobic particles provided on the soil block. A method of preventing land desertification includes the steps of placing a hydrophobic layer of hydrophobic particles in a soil at a prescribed depth from the earth surface and controlling the water content in said soil.

Abstract: An agent for the prevention of salt damage of plants for use in intermediate soil comprised of water-repellent particles, and a method of preventing salt damage to plants from salty soil using an agent to establish a water-repellent layer as a layer above the underground water level. An agent for the prevention of salt accumulation in greenhouse soil comprised of hydrophobic particles which are substantially hydrophobic. A salt accumulation prevention layer containing an agent for the prevention of salt accumulation in greenhouse soil which is provided at the surface layer or a prescribed depth from the surface layer of the greenhouse soil.

Abstract: Silicon isotopes are effectively separated by irradiating a polysilane compound or a fluoromosilane compound according to this invention with infrared laser rays. The polysilane compound is defined by the formula.Si.sub.a X.sub.b H.sub.cwhere 2.ltoreq.a.ltoreq.3, 0.ltoreq.b.ltoreq.2a+2, 2a+2=b+c and X represents a kind or kinds of halogen, and the fluoromonosilane compound is defined by the formula.SiFX.sub.1 X.sub.2 X.sub.3where X.sub.1 and X.sub.2 are selected from the group consisting of H, Cl, Br, I, F, an alkyl radical and a halogen derivative of the alkyl radical, and X.sub.3 is selected from the group consisting of H, Cl, Br, I, an alkyl radical and a halogen derivative of the alkyl radical.

Abstract: Modified epoxy resin compositions having excellent flexibility and excellent compatibility with conventional epoxy resins as well as exhibiting the original properties of the epoxy resin before being modified such as mechanical strength, adhesion, heat resistance are disclosed and chemical resistance, which are obtained by treating an epoxy resin with at least one modified adduct [D] of a conjugated diene polymer or copolymer which has an imido bond and/or amido bond and a semi-ester structure and has an acid value owing to a free carboxyl group of 5 to 100. The modified adduct is obtained by reacting an adduct [A] of a polymer of a conjugated diene having a number average molecular weight of 300 to 20,000 or a copolymer of the conjugated diene and a vinyl monomer with an .alpha.,.beta.-unsaturated dicarboxylic acid or its anhydride, with a compound [B] containing one primary amino group in the molecule and a compound [C] containing a hydroxy group in the molecule.

Abstract: Modified epoxy resin composition having excellent flexibility and excellent compatibility with conventional epoxy resins as well as the original properties of the epoxy resin before modified such as mechanical strength, adhesion, heat resistance and chemical resistance, which is obtained by treating an epoxy resin with at least one modified adduct [D] of a conjugated diene polymer or copolymer which has an imido bond and/or amido bond and a semi-ester structure and has an acid value owing to a free carboxyl group of 5 to 100, said modified adduct being obtained by reacting an adduct [A] of a polymer of a conjugated diene having a number average molecular weight of 300 to 20,000 or a copolymer of the conjugated diene and a vinyl monomer with an .alpha.,.beta.-unsaturated dicarboxylic acid or its anhydride, with a compound [B] of the formula: ##STR1## and a compound [C] of the formula:R.sub.3 --CH.sub.2).sub.m OH [II].

Abstract: A needle holding device for a sewing machine having a needle with a cylindrical shank having a flat edge surface extending along the shank includes a needle bar for supporting the needle, a needle holder mounted to the needle bar and a holding screw to fasten the needle to the needle bar. The needle bar is formed with a vertical groove defined by a horizontal wall and an inclined wall which are adjacent to each other to define a wedge-shaped space. The needle holder has a vertical circular hole having an inner periphery and a transverse hole extended into the vertical hole. When the needle holder is mounted to the needle bar the inner periphery of the vertical hole and the wedge-shaped space of the needle bar groove form a wedge-shaped chamber into which the shank of the needle is inserted. The holding screw fastens the needle upon insertion into the needle bar when the flat edge of the shank is positioned against the horizontal wall of the groove.

Abstract: A resin composition for electrocoating which comprises(I) a reaction product (G) of an epoxy compound (E), optionally an epoxy group-modifying agent (F) and a partially esterified and/or partially amidated product (D) which is obtained by partially esterifying and/or partially amidating an adduct (A) of a conjugated diene polymer with an .alpha.,.beta.-unsaturated dicarboxylic acid or its anhydride with an alcoholic hydroxy group-containing compound (B) and/or a primary or secondary monoamine (C), respectively, and(II) a completely blocked organic polyisocyanate,said mixture of the reaction product (G) and the completely blocked organic polyisocyanate being neutralized, ora neutralized product of an adduct (H) of the reaction product (G) with a partially blocked organic polyisocyanate.The resin composition is applicable to electrocoating, particularly cathodic electrocoating, and hence, is useful for electrocoating of steel products, particularly for electrocoating of automobiles.

Abstract: A process for production of the maleic anhydride adduct of a liquid polymer having a maleic anhydride addition amount of 2 to 70% by weight, which comprises reacting a liquid polymer having a molecular weight of 150 to 5,000 and a viscosity of 2 to 50,000 cp at 30.degree. C. in the presence of at least one compound, as a gelation inhibitor, selected from the group consisting of imidazoles, thiazoles, metallic salts of mercaptothiazoles, urea derivatives, naphthylamines, nitrosamines, iron, iron compounds and specific halogen compounds, said liquid polymer being selected from the group consisting of liquid polybutadienes, liquid polyisoprenes and liquid copolymers comprising units of butadiene or isoprene and units of at least one compound selected from the group consisting of other diolefins, olefins and aromatic vinyl compounds.

Abstract: A process for production of the maleic anhydride adduct of a liquid polymer having a maleic anhydride addition amount of 2 to 70% by weight, which comprises reacting a liquid polymer having a molecular weight of 150 to 5,000 and a viscosity of 2 to 50,000 cp at 30.degree. C in the presence of at least one compound, as a gelation inhibitor, selected from the group consisting of imidazoles, thiazoles, metallic salts of mercaptothiazoles, urea derivatives, naphthylamines, nitrosamines, iron, iron compounds and specific halogen compounds, said liquid polymer being selected from the group consisting of liquid polybutadienes, liquid polyisoprenes and liquid copolymers comprising units of butadiene or isoprene and units of at least one compound selected from the group consisting of other diolefins, olefins and aromatic vinyl compounds.