摘要:
A method for regenerating a fluorescent material from a recovered phosphor slurry characterized by including a chemical washing step wherein a hypochlorite and a periodate are used; a carbon removing step for floating carbon in the supernatant liquid by the use of ammonia thereby removing the carbon; an acid washing step; and a heat treating step in this order as well as a system for regenerating a fluorescent material comprising means for effecting the aforesaid steps. From this constitution, it becomes possible that impurities are easily and effectively removed from the recovered phosphor slurry, whereby a fluorescent material providing excellent luminance and excellent grade of phosphor film can be regenerated.
摘要:
Benzaldehyde acetal compounds represented by the following formula: ##STR1## in which each R is a C.sub.3-8 alkyl group and forms an ether bond with the corresponding oxygen atom of the orthoaldehyde moiety have no injury to crops and, moreover, exhibits superb herbicidal effects owing to the limitation of the number of carbon atoms of each alkyl group to 3-8.
摘要:
Herbicidally active pyridyloxypyrimidines represented by the following formula [I]: ##STR1## wherein R means a formyl group or an acetal group represented by ##STR2## R.sup.1 and R.sup.2 being the same or different and individually denoting an alkyl group having 1-4 carbon atoms or R.sup.1 and R.sup.2 being coupled together and denoting an alkylene group, R.sup.3, having 2-3 carbon atoms; are prepared by reacting 2 formyl-3-hydroxypyridine or 3-hydroxy-2-pyridine carboxaldehyde acetal with 2 halogeno-4,6 dimethoxypyrimidine in the presence of a base.
摘要:
Disclosed are herbicidally active pyrimidine derivatives of the formula ##STR1## wherein R represents a hydrogen atom or an etherifying group, e.g., a lower alkyl, lower alkenyl, lower alkynyl, phenyl-substituted lower alkenyl, lower haloalkenyl, cycloalkyl, substituted phenyl-substituted lower alkenyl or phenyl-substituted lower alkynyl group; or a group represented by the following formula: ##STR2## wherein R.sup.1 represents a hydrogen atom or a lower alkyl group, X a halogen atom or a lower alkyl or lower alkoxyl group, m and n individually 0-2, and when m is 2, both Xs may be the same or different, and herbicidal compositions containing the same, alone or in combination with another herbicidally active compound, the pyrimidine derivatives being prepared by reaction of 2-(4,6-dimethoxy-2-pyrimidinyloxy)benzaldehyde with NH.sub.2 OR or with a salt of hydroxylamine followed by reaction with a halide of the formula RY wherein R has the same value as above and Y is Cl, Br or I.
摘要:
Novel 3-substituted phenyl-2-isoxazoline-5-carboxylic acids or esters thereof. These compounds have excellent properties as plant growth regulators.
摘要:
Zinc silicate phosphor emitting green for cathode ray tubes with a long persistence, which does not contain arsenic.______________________________________ Formula aZnO.SiO.sub.2 :Mn.sub.x,In.sub.y ______________________________________ in which the conditions 1.5 .ltoreq. a .ltoreq. 2 5 .times. 10.sup.-5 .ltoreq. x .ltoreq. 3 .times. 10.sup.-2 1 .times. 10.sup.-5 .ltoreq. y .ltoreq. 1 .times. 10.sup.-2 ______________________________________ are satisfied.
摘要:
A process for preparing piperonal which comprises the steps of reacting 1,2-methylenedioxybenzene with an N-alkylformanilide and a condensing agent comprising one or more compounds selected from the group consisting of phosgene, phosphorus oxychloride, phosphorus oxybromide, thionyl chloride, thionyl bromide, sulfuryl chloride, sulfuryl bromide, phosphorus trichloride, and phosphorus pentachloride, and then hydrolyzing the resulting reaction product.
摘要:
A vibration damping structure for a steering wheel includes an airbag mounted in the steering wheel, an inflator arranged forward of the airbag, and a support member elastically supporting the inflator at a position forward of the inflator. The inflator includes a peripheral wall portion and gas ports formed in the wall portion. The support member has a hole facing the inflator. A sealing portion is provided to surround the hole. Through contact between the inflator and the support member at the sealing portion, gas leakage via the hole is prevented. The inflator has a pressure receiving portion in the vicinity of the gas ports to change the flow direction of gas, which is discharged outward from the gas ports in the radial direction of the wall portion, to a direction toward a rear side. The pressure receiving portion produces force acting forward by receiving pressure from the gas.
摘要:
An LED light emitting device is provided that has high color rendering properties and is excellent color uniformity and, at the same time, can realize even luminescence unattainable by conventional techniques. A phosphor having a composition represented by formula: (Sr2-X-Y-Z-ωBaXMgYMnZEuω)SiO4 wherein x, y, z, and ω are respectively coefficients satisfying 0.1 z, and 0.01
摘要:
A white light emitting lamp 1 includes a phosphor layer 5 which emits white light by being excited by light emitted from a semiconductor light emitting element 2. A transparent resin layer 4 is interposed between the semiconductor light emitting element 2 and the phosphor layer 5. The phosphor layer 5 contains, as a green phosphor, a rare earth borate phosphor activated by trivalent cerium and terbium.