Abstract: A disordered fluorite-type photochemical hole burning crystal contains Sm.sup.2+ as active ions, and a composition except Sm.sup.2+ is represented by a general formula .alpha.-(MALn)F.sub.6-v X.sub.v where 0.ltoreq.v.ltoreq.1, and M is an element selected from Ca, Sr and Ba, A is an element selected from Na, K, Rb and Cs, Ln is an element selected from Y, La, Gd and Ce, and X is an element selected from Cl, Br and I. Stable hole burning occurs at the room temperature to create narrow holes. The crystal can be used as a superior optical recording material for a room temperature operation.

Abstract: A magnetic recording medium having coated thereon a lubricant of such a purity that no impurities and low molecular weight species are substantially detected by gel permeation chromatography.

Abstract: There is provided a magnetoresistance effect element comprising a substrate and at least two magnetic thin layers which are laminated with interposing a non-magnetic thin layer therebetween on said substrate, wherein adjacent magnetic thin layers through the non-magnetic thin layer have different coercive forces, characterized in that a metal thin film is provided in an interface between at least one of the magnetic layers and the non-magnetic layer which is adjacent thereto, and the metal thin film is made of a substance which is different from that of the adjacent non-magnetic layer.

Abstract: Method of assay of enzymatic activity, including projecting excitation light to a sample containing an enzyme, a substrate which forms a product by action of the enzyme, and a reference substance which is insensitive to the action of the enzyme but emits fluorescence; obtaining a first measured value of fluorescence intensity of the sample at a first wavelength region which includes fluorescence emitted by the substrate or the product at least, obtaining a second measured value of fluorescence intensity at a second wavelength region which is different from the first wavelength region for the first measured value and includes fluorescence emitted by the reference substance; and assaying the enzymatic activity from the ratio of the first measured value to the second measured value and apparatus for performing the method. The method assures high accuracy and high sensitivity of measurement in enzyme labeled immunoassay and enzyme labeled DNA hybridization.

Abstract: A novel process for the preparation of a chlorinated polyolefin having excellent low temperature characteristics and brightness is provided which comprises allowing a polyolefin dissolved or suspended in a solvent to undergo chlorination reaction with chlorine gas or chlorinated sulfuryl in the presence of a radical initiator as a catalyst, characterized in that as said solvent there is used 1,1,2-trichloroethane and the temperature is controlled to 90.degree. C. or lower at the process for removing hydrogen chloride and/or sulfur dioxide by-produced during the reaction from the reaction system.

Abstract: A process for removing nitrogen oxides from oxygen rich exhaust gas containing nitrogen oxides and hydrocarbons using a catalyst composed of at least one active metal and zeolite having a molar ratio of SiO.sub.2 /Al.sub.2 O.sub.3 of at least 15, treated with a vapor of at least one silicon compound selected from alkylchlorosilanes, alkoxysilanes, alkoxyalkylsilanes, and silicon tetrachloride or treated with an alkoxysilane or silicon tetrachloride in an organic solvent.

Abstract: A microspherical packing for liquid chromatography, which comprises a porous silicon carbide having numerous through-pores, and a process for producing said microspherical packing.

Abstract: A catalyst for purifying an exhaust gas comprising a zeolite catalyst ion exchanged with cobalt and at least one alkaline earth metal and a zeolite catalyst ion-exchanged with copper, provided on an inlet side of an exhaust gas stream and an outlet side of the exhaust gas respectively, or randomly present in a mixed state.

Abstract: In a backlighting device for use with display panels that comprises a light conducting plate made of a light-transmissive material, one of the major faces of said light conducting plate being provided with a light diffusing capability and covered with a specular or light diffusing/reflecting plate, and a linear light source provided in proximity to the end portion of at least one side of said light conducting plate, the improvement wherein at least one sheet that is made of a light-transmissive material and that has a multiple of raised structures having straight ridgelines at minute intervals on the same side in such a manner that the ridgelines are substantially parallel to one another or at least one sheet that is made of a light-transmissive material and that has a multiple of pyramidal or conical projecting structures at minute intervals on the same side, said projecting structures having portions of such a shape that the vertical angles are substantially the same, is provided on the exit face of the lig

Abstract: A target substance is detected by a sandwich immunoassay using fine particle (A) having bound to it a fluorescer and an antibody reacting specifically with the target substance, and a fine particle (B) having bound to it a quencher and an antibody reacting specifically with the target substance, through a different antigenic determinant. Also disclosed is a competitive immunoassay having a fine particle (C) bound to it a fluorescer or a quencher, and an antibody reacting specifically with the target substance, a bound product (D) composed of the remainder of the fluorescer and the quencher, or a known amount of the target substance. Binding of the fluorescer and the quencher to the fine particle (A), (B) or (C) is affected so that the fluorescer and the quencher are covalently bound to a substance adsorbed on the fine particle.

Abstract: A transition metal organometallic compound comprising a transition metal in any one of group 3A to group 8 of the periodic table and cyclic compounds containing a heteroaom in group 5 or group 5B of the periodic table and having a cyclic structure including a .pi.-bonded portion and composed of said heteroatom and said .pi.-bonded portion, wherein said transition metal has a bond of a .pi.-binding heterocylic ligand, said heteroatom and said .pi.-bonded portion and a catalyst for polymerizing olefin comprising the above organic metal compound and an organic compound.

Abstract: A method for purifying an exhaust gas containing an excess amount of oxygen, to remove nitrogen oxides, carbon monoxide and hydrocarbons therefrom, by bringing a catalyst into contact with the exhaust gas, the catalyst comprising a zeolite ion-exchanged with (a) cobalt or (b) both cobalt and at least one metal selected from the group consisting of alkaline earth metals and rare earth metals, the zeolite being selected from the group consisting of ferrierite, ZSM-5, ZSM-11, ZSM-12 and ZSM-20, and having a silica-to-alumina molar ratio of from 15 to 1,000.

Abstract: Novel catalysts for polymerization of ethylene or .alpha.-olefins, comprising a metallocene, an organoaluminum compound an ionic compound, and a boron compound, or comprising an ionic metallocene, an organoaluminum compound and a boron compound. Process for polymerization of ethylene or .alpha.-olefins by use of the above catalysts.

Abstract: Nitrogen oxides are removed from an oxygen rich exhaust gas containing nitrogen oxides and hydrocarbons by bringing the oxygen rich exhaust gas into contact with a catalyst composed of phosphorus and at least one active metal contained in a zeolite having a molar ratio of SiO.sub.2 /Al.sub.2 O.sub.3 of at least 15.

Abstract: Zeolite .beta. is prepared by reacting a granular amorphous aluminosilicate, prepared by continuously reacting an aqueous solution of an alkali metal silicate and an aqueous solution containing aluminum for a specific time at a temperature of 0.degree. to 55.degree. C. and pH of 5 to 9 the following at molar ratios______________________________________ SiO.sub.2 /Al.sub.2 O.sub.3 10:1.about.200:1 and M.sub.2 O/Al.sub.2 O.sub.3 0.8.about.1.2 ______________________________________where M means an alkali metal contacting it with alkali metal hydroxide tetraethylammonium compound and water at molar ratios of ______________________________________ SiO.sub.2 /Al.sub.2 O.sub.3 10:1.about.200:1 and M.sub.2 O/SiO.sub.2 0.01.about.1, H.sub.2 O/SiO.sub.2 8.about.30 and R.sub.2 O/SiO.sub.2 0.05.about.0.7 ______________________________________where R is tetraethylammonium, for 24 to 120 hours at 70.degree. to 160.degree. C. to crystallize.

Abstract: A phenol is produced by reacting an aromatic compound with oxygen and hydrogen in the liquid phase in the presence of a catalyst comprising a noble metal of group VIII of the periodic table, which is supported on a carrier, and in the co-presence of a vanadium compound. The reaction is carried out either (i) by using as the catalyst a catalyst containing 0% to 0.15% by weight, based on the weight of the catalyst, of halogens, or (ii) further in the co-presence of a diketone compound of the following formula (1) or (2): ##STR1## wherein R.sup.1 and R.sup.

Abstract: Resin compositions having excellent heat resistance, izod impact strength, rigidity and dimensional resistance and the like, applied in the fields of the automobile, electric and electronic, and the like industries. The resin composition comprising: a) a resin in which 30 to 98 mole % of the component (I) are contained in the whole polymer and 70 to 2 mole % of the component (II) are contained in the whole polymer, its weight-average molecular weight converted into that of polystyrene being 1.times.10.sup.3 or more to 5.times.10.sup.6 or less, and b) an olefin resin; then the a)/b) content being 5/95 to 99/1 as a weight ratio, ##STR1## wherein R.sub.1 is an alkyl group having 1 to 18 carbon atom(s) or a cycloalkyl group having 3 to 12 carbon atoms; and ##STR2## wherein R.sub.2 is hydrogen or an alkyl group having 1 to 8 carbon atom(s), and R.sub.3 and R.sub.4 is an alkyl group having 1 to 8 carbon atoms.

Abstract: A polyethylene, having 1 to 60 methyl branches and 1 to 60 hexyl or higher branches per 1000 carbon atoms, a g-value of 0.5 to 0.8, and a limiting viscosity [.eta.] of 0.005 to 20.0 dl/g as measured at 140.degree. C. in o-dichlorobenzene, and a method for producing the same by polymerizing ethylene using a catalyst system comprising a coordination nickel compound of zero- or two-valent nickel and an aminobis(imino)phosphorane represented by a general formula (I): ##STR1## where R.sub.1, R.sub.2, R.sub.3 and R.sub.4 may be the same as or different from each other and are respectively n-alkyl, isoalkyl, aryl or trialkylsilyl, in the presence of .alpha.-olefin.

Abstract: A shot method wherein a shot media based on zirconia composed of a sintered body of partially stabilized zirconia, of which a substantial quantity of the shot media pass through a sieve of normal sizes with apertures of 2.36 mm or less, of which the mean relative density against the theoretical density of zirconia is not less than 95%, of which the mean grain size is not more than 1.0 .mu.m, and which has a mean Vickers hardness of not less than 1,000 kgf/mm.sup.2, is shot to a work surface.

Abstract: A catalyst for and method of purifying an exhaust gas to thereby remove nitrogen oxides, carbon monoxide and hydrocarbons from an oxygen rich exhaust gas containing same, comprising a zeolite having (i) manganese, (ii) cobalt and palladium, or (iii) cobalt and silver contained therein.