Abstract: A difluoroethylene compound of the following formula (1) having a liquid crystal property is provided:R.sup.1 --(A.sup.1).sub.m --Y.sup.1 --A.sup.2 --CF.dbd.CF--A.sup.3 --Y.sup.2 --(A.sup.4).sub.n --R.sup.2 (1)wherein A.sup.1 --A.sup.4, Y.sup.1, Y.sup.2, R.sup.1, R.sup.2, m and n are as defined herein.

Abstract: A difluoroethylene compound of the following formula (1) is provided:R.sup.1 --(A.sup.1).sub.m --Y.sup.1 --A.sup.2 --CF.dbd.CF--A.sup.3 --Y.sup.2 --(A.sup.4).sub.n --R.sup.2 (1)where A.sup.1 -A.sup.4, Y.sup.1, Y.sup.2, R.sup.1, R.sup.2, m and n are as defined herein, and wherein the compound of formula (1) exhibits liquid crystal properties.

Abstract: A difluoroethylene compound of the following formula (1):R.sup.1 --(A.sup.1).sub.m --Y.sup.1 --A.sup.2 --CF.dbd.CF--A.sup.3 --Y.sup.2 --(A.sup.4).sub.n --R.sup.2 (1)wherein A.sup.3 is a trans-1,4-cyclohexylene group, and each of A.sup.1, A.sup.2 and A.sup.4, which are independent from one another, is a trans-1,4-cyclohexylene group or a 1,4-phenylene group, wherein each of such cyclic groups is unsubstituted or substituted by one or more halogen atoms or cyano groups, one or more .dbd.CH-- groups constituting rings of such cyclic groups may be substituted by nitrogen atoms, and one or more --CH.sub.2 -- groups constituting rings of such cyclic groups may be substituted by oxygen atoms or sulfur atoms.

Abstract: A trans-dihalogenostilbene compound of the formula: ##STR1## wherein each of A.sup.1 to A.sup.4, which are independent from one another, is a trans-1,4-cyclohexylene group or a 1,4-phenylene group, which is unsubstituted or substituted by one or more halogen atoms, methyl groups or nitrile groups and in which one or more CH groups may be substituted by nitrogen atoms, and one or more CH.sub.2 groups may be substituted by oxygen atoms or sulfur atoms; each of B.sup.1 and B.sup.2, which are independent from each other, is a 1,4-phenylene group, which is unsubstituted or substituted by one or more halogen atoms, methyl groups or nitrile groups and in which one or more CH groups may be substituted by nitrogen atoms; each of Y.sup.1 to Y.sup.4, which are independent from one another, is --COO--, --O--, --OCO--, --CH.sub.2 CH.sub.2 --, --CH.sub.2 --, --CH.dbd.CH--, --OCH.sub.2 --, --CH.sub.2 O--, --CH.dbd.N--, --NO.dbd.N--, --N.dbd.ON--, --C.tbd.C--, --N.dbd.N-- or a single bond; each of X.sup. 1 and X.sup.

Abstract: A light-sensitive silver halide photographic material for X-ray photography characterized in that the material has the characteristic curve whose gamma between optical densities of 0.50 and 1.50 is 2.7 to 3.3 and gamma between optical densities of 2.00 and 3.00 is 1.5 to 2.5, when processed by use of the following developer:______________________________________ Potassium sulfite 55.0 g Hydroquinone 25.0 g 1-Phenyl-3-pyrazolidone 1.2 g Boric acid 10.0 g Potassium hydroxide 21.0 g Triethylene glycol 17.5 g 5-Methylbenztriazole 0.04 g 5-Nitrobenzimidazole 0.11 g 1-Phenyl-5-mercaptotetrazole 0.015 g Glacial acetic acid 16.0 g Potassium bromide 4.0 g Add water to make up one liter.

Abstract: A silver halide X-ray photosensitive material has a support bearing thereon a silver halide emulsion layer. The layer has at least three kinds of silver halide emulsions whose photographic characteristics are substantially different from each other. Out of at least three kinds of the silver halide emulsions, at least one of them is a monodisperse emulsion E.sub.1 and at least another one of them is a polydisperse emulsion E.sub.2.