Abstract: An optical compensation sheet for improving the visual characteristics of a liquid crystal display device is disclosed with a liquid crystal display device using such a sheet. The optical compensation sheet contains at least one photopolymerization substance that is sterically or structurally isomerized by light, and has negative uniaxiality, with the optic axis of the sheet intersecting the surface of the sheet. Application of this optical compensation sheet to a TN liquid crystal display device allows it the visual angle property to be improved, thereby providing a high definition liquid crystal display device.

Abstract: Disclosed is a non-linear optical material represented by the following formula: ##STR1## wherein X represents a methyl group or a hydrogen atom, with the proviso that when X is a methyl group, A represents a nitrogen atom, Y represents a methyl group and B represents a nitrogen atom; and when X is a hydrogen atom , A represents C--COOC.sub.2 H.sub.5, Y represents a hydrogen atom and B represents C--CH.sub.3.In one embodiment, the non-linear optical material is represented by the following formula (I): ##STR2## In another embodiment, the non-linear optical material is represented by the following formula (II): ##STR3## Also disclosed is an orthorhomic molecular crystal having a space group of Pna2.sub.1 and constituted by molecules represented by the above formula (I).

Abstract: 3,5-Dimethyl-1-(4-nitrophenyl) pyrazole having at least one deuterium atom and a non-linear optical material comprising the same is described herein.

Abstract: Disclosed is a silver halide photographic material comprising a compound represented by the general formula (I), (II), or a salt thereof or a compound represented by the general formula (III), with these groups being defined as in the specification: ##STR1## also disclosed is a method for the processing of a silver halide photographic material, which comprises processing a silver halide photographic material in the presence of a compound represented by the general formula (I) or (II) or a salt thereof or a compound represented by the general formula (III).

Abstract: A nonlinear optical material comprising a compound represented by the following general formula (I): ##STR1## wherein R and R' are each an alkyl group, an aryl group, an aralkyl group or a hetero ring, and a method of converting the wavelength of laser light using the organic nonlinear optical material.

Abstract: A process for preparing a silver halide emulsion is disclosed, which comprises dissolving one or more substantially water-insoluble photographic additives in a solution of an organic solvent containing a surface active agent having a hydrophilic -SO.sub.3 or --OSO.sub.3 group wherein said organic solvent is an alcohol, and then adding the resulting solution to a silver halide emulsion. A small amount of a base, or small amounts of a base and an acid may optionally be present in the mixed solution of the organic solvent and the surface active agent prior to adding the one or more substantially water-insoluble photographic additives.

Abstract: A process for preparing a silver halide emulsion, which comprises dissolving one or more substantially water-insoluble photographic additives in a heated solution of an organic solvent containing a surfactant having a hydrophilic --CO.sub.3 or --OSO.sub.3 group to completely dissolve the one or more substantially water-insoluble additives, cooling the resulting solution to precipitate crystals, separating the crystals from the solution, drying the separated crytals, dispersing said crystals in water and adding the resulting dispersion to a silver halide emulsion.

Abstract: A process for preparing a silver halide emulsion is disclosed, which comprises dissolving one or more substantially water-insoluble photographic additives in a solution of an organic solvent containing a surface active agent having a hydrophilic --SO.sub.3 or --OSO.sub.3 group wherein said organic solvent is an alcohol, and then adding the resulting solution to a silver halide emulsion. A small amount of a base, or small amounts of a base and an acid may optionally be present in the mixed solution of the organic solvent and the surface active agent prior to adding the one or more substantially water-insoluble photographic additives.