Abstract: A panoramic imaging lens having an annular light incident surface formed in a substantial convex lens form; a first reflective surface formed in an annular concave mirror form to reflect light inside the lens; a second reflective surface provided at a central part inside the annular light incident surface to reflect the reflected light from the first reflective surface toward an inner part of the annular first reflective surface; and a light outgoing surface positioned at a central part inside the annular first reflective surface and opposing the second reflective surface to transmit light. A non-reflective part exerting no regular reflection of light is provided on a light path toward the light incident surface amongst light paths of light proceeding to agree with a light path of imaging light incident on and refracted at the light incident surface and proceeding inside the lens.

Abstract: It has an annular light incident surface formed in a substantial convex lens form; a first reflective surface formed in an annular concave mirror form to reflect light inside the lens; a second reflective surface provided at a central part inside the annular light incident surface to reflect the reflected light from the first reflective surface toward an inner part of the annular first reflective surface; and a light outgoing surface positioned at a central part inside the annular first reflective surface and opposing the second reflective surface to transmit light.

Abstract: A packing material for chromatographic use wherein an organosilane of formula (I): ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3, which may be the same or different, each represents an alkyl, alkoxy or hydroxyl group or a halogen atom, provided that at least one of them represents an alkoxy group or a halogen atom; X represents an --NHCO-- or --NH.sub.3.sup..+-. --OCO-- group; n is an integer of 2 to 4; and *C represents an asymmetric carbon atom, is grafted on an inorganic carrier having hydroxyl groups on the surface thereof as well as a method for the analysis of an enantiomer mixture using the same are disclosed.

Abstract: A packing material for chromatographic use which comprises an inorganic carrier having hydroxyl groups at the surface thereof having grafted thereon an .alpha.-arylalkylamine derivative which is formed by bonding an optically active .alpha.-arylalkylamine and an aminoalkylsilane through a dibasic carboxylic acid, and a method for liquid chromatographic analysis of an enantiomer mixture using this packing material as a stationary phase. The packing material of the present invention can be easily produced by the usual chemical reaction, is chemically stable, and exhibits excellent effects in the separation of an enantiomer mixture of a compound having an --NH-- group, --CONH-- group, or an --OCO-- group bonded to an asymmetric carbon atom thereof.

Abstract: An emulsifier composition suitable for preparing an asphalt emulsion comprises a monoamine having an aliphatic hydrocarbon group having 8 to 22 carbon atoms, a diamine having an aliphatic hydrocarbon group having 8 to 22 carbon atoms and a polyamine having an aliphatic hydrocarbon group having 8 to 22 carbon atoms and containing 3 to 6 amino groups, wherein the average number of amino groups contained therein is at least 1.7.

Abstract: A paving composition is prepared by mixing heated asphalt with a composition comprising an epoxy resin and an amine having 2 active hydrogens and either an aliphatic hydrocarbon group having 8 to 22 carbon atoms or an alkylphenyl group in which the alkyl has 8 to 22 carbon atoms.

Abstract: Asphalt having a high adhesion strength is prepared by incorporating in asphalt a small amount of monocarboxylic chromic chloride expressed by the following general formula: ##EQU1## WHEREIN R is an alkyl or alkenyl group having 1 to 21 carbon atoms, as an antistripping agent.

Abstract: Asphalt emulsions are rapidly hardened by incorporating therein an isocyanate-terminated urethane prepolymer formed by reacting one equivalent of the OH group of a polyalkylene glycol having the following formula ##EQU1## wherein p + r .gtoreq. q, q .gtoreq. O, p .gtoreq. 1, r .gtoreq. 1 and 20 .ltoreq. p + q + r .ltoreq. 100, with 1.1 to 2.0 equivalents of the NCO group of an organic diisocyanate.