Abstract: Performance of an encoding process and a decoding process for a sound signal is enhanced. A representative value calculating part 110 calculates, for each frequency section by a plurality of samples fewer than the number of frequency samples of a sample sequence of a frequency domain signal corresponding to an input acoustic signal, from the sample sequence of the frequency domain signal, a representative value of the frequency section from sample values of samples included in the frequency section, for each of predetermined time sections. A signal companding part 120 obtains, for each of the predetermined time sections, a frequency domain sample sequence obtained by multiplying a weight according to a function value of the representative value by a companding function for which an inverse function can be defined and each of the samples corresponding to the representative value in the sample sequence of the frequency domain signal, as a sample sequence of a weighted frequency domain signal.

Abstract: Performance of an encoding process and a decoding process for a sound signal is enhanced. A representative value calculating part 110 calculates, for each frequency section by a plurality of samples fewer than the number of frequency samples of a sample sequence of a frequency domain signal corresponding to an input acoustic signal, from the sample sequence of the frequency domain signal, a representative value of the frequency section from sample values of samples included in the frequency section, for each of predetermined time sections. A signal companding part 120 obtains, for each of the predetermined time sections, a frequency domain sample sequence obtained by multiplying a weight according to a function value of the representative value by a companding function for which an inverse function can be defined and each of the samples corresponding to the representative value in the sample sequence of the frequency domain signal, as a sample sequence of a weighted frequency domain signal.

Abstract: The cleaning agent composition for hard surface contains (A) at least one kind of carboxylic acid compound selected from the group consisting of an aliphatic monocarboxylic acid, a polycarboxylic acid, and any neutralized salt of these, (B) an alkanolamine compound, and (C) a hydroxyl group-containing compound having from 8 to 50 carbon atoms.

Abstract: A metal cleanser composition includes: (A) at least one carboxylic acid compound selected from the group consisting of an aliphatic monocarboxylic acid, a polycarboxylic acid, and a neutral salts thereof; (B) a specific oxyalkylene group-containing compound; and (C) at least one compound selected from the group consisting of a specific organic phosphonic acid and a salt thereof, and a specific nitrogen-containing heterocycle-containing compound.

Abstract: The cleaning agent composition for hard surface contains at least one kind of carboxylic acid compound selected from the group consisting of an aliphatic monocarboxylic acid, a polycarboxylic acid, and any neutralized salt of these, a specific first alkyleneoxy group-containing compound, a specific second alkyleneoxy group-containing compound, and a specific oxypropylene group-containing compound.

Abstract: The cleaning agent composition for hard surface contains (A) at least one kind of carboxylic acid compound selected from the group consisting of an aliphatic monocarboxylic acid, a polycarboxylic acid, and any neutralized salt of these, (B) an alkanolamine compound, and (C) a hydroxyl group-containing compound having from 8 to 50 carbon atoms.

Abstract: The cleaning agent composition for hard surface contains at least one kind of carboxylic acid compound selected from the group consisting of an aliphatic monocarboxylic acid, a polycarboxylic acid, and any neutralized salt of these, a specific first alkyleneoxy group-containing compound, a specific second alkyleneoxy group-containing compound, and a specific oxypropylene group-containing compound.

Abstract: Boiler water is heated in a steam boiler while feed water, which has a hardness of 5 mg CaCO3/L or less and is used as the boiler water, is supplied to the steam boiler. A part of the boiler water is appropriately disposed of. A chemical aqueous solution containing an alkaline metal silicate, an alkaline metal hydroxide and at least one kind of scale preventive agents of ethylenediamine tetraacetate, and its alkaline metal salt, is supplied to the feed water so that a concentration of the scale preventive agent is at least 1.5 mol equivalent times relative to the hardness of the feed water. In the steam boiler, a condensation rate of the boiler water is set so that the concentration of the scale preventive agent in the boiler water is 40 mg EDTA/L or less.

Abstract: A process for inhibiting polymerization of an aromatic vinyl compound during the stage of producing, purifying, storing or transporting the aromatic vinyl compound which not only inhibits an initial polymerization but also inhibits polymerization efficiently over a long period of time and which is excellent in handleability. The process involves the step of adding a nitrogenous aromatic compound in combination with a sulfonic acid compound to the aromatic vinyl compound during the production, purification, storage of transportation thereof.

Abstract: A process for inhibiting polymerization of an aromatic vinyl compound during the stage of producing, purifying, storing or transporting the aromatic vinyl compound which not only inhibits an initial polymerization but also inhibits polymerization efficiently over a long period of time and which is excellent in handleability. The process involves the step of adding a nitrogenous aromatic compound in combination with a sulfonic acid compound to the aromatic vinyl compound during the production, purification, storage of transportation thereof.

Abstract: It is intended to effectively suppress corrosion of a feed-water supply pipe in a preheater, by means of recirculation of boiler water to feed-water to be supplied to a steam boiler, even if a concentration of an alkaline component of the feed-water is relatively high. An alkali metal hydroxide is added from an agent-adding unit (14) to feed-water after removing therefrom a water hardness component in a water-softener unit (15) using a cation exchange resin and then removing therefrom dissolved gas in a degasifier unit (16). Then, the feed-water is supplied to a steam boiler 20 via a feed-water supply line 13 while being heated by a preheater (41). A part of boiler water having a pH value increased along with an increase in concentration of the alkali metal hydroxide resulting from enrichment thereof in the steam boiler (20) is mixed with the feed-water via a recirculation line (38).

Abstract: A process for inhibiting polymerization of an aromatic vinyl compound during the stage of producing, purifying, storing or transporting the aromatic vinyl compound which not only inhibits an initial polymerization but also inhibits polymerization efficiently over a long period of time and which is excellent in the handleability. The process involves the step of adding a nitrogenous aromatic compound in combination with a sulfonic acid compound to the aromatic vinyl compound during the production, purification, storage of transportation thereof.

Abstract: Boiler water is heated in a steam boiler while feed water, which has a hardness of 5 mgCaCO3/L or less and is used as the boiler water, is supplied to the steam boiler. A part of the boiler water is appropriately disposed of. A chemical aqueous solution containing an alkaline metal silicate, an alkaline metal hydroxide and at least one kind of scale preventive agents of ethylenediamine tetraacetate, and its alkaline metal salt, is supplied to the feed water so that a concentration of the scale preventive agent is at least 1.5 mol equivalent times relative to the hardness of the feed water. In the steam boiler, a condensation rate of the boiler water is set so that the concentration of the scale preventive agent in the boiler water is 40 mg EDTA/L or less.

Abstract: It is intended to effectively suppress corrosion of a feed-water supply pipe in a preheater, by means of recirculation of boiler water to feed-water to be supplied to a steam boiler, even if a concentration of an alkaline component of the feed-water is relatively high. An alkali metal hydroxide is added from an agent-adding unit (14) to feed-water after removing therefrom a water hardness component in a water-softener unit (15) using a cation exchange resin and then removing therefrom dissolved gas in a degasifier unit (16). Then, the feed-water is supplied to a steam boiler 20 via a feed-water supply line 13 while being heated by a preheater (41). A part of boiler water having a pH value increased along with an increase in concentration of the alkali metal hydroxide resulting from enrichment thereof in the steam boiler (20) is mixed with the feed-water via a recirculation line (38).

Abstract: According to the present invention, there is provided a process for inhibiting polymerization of an aromatic vinyl compound during the stage of producing, purifying, storing or transporting the aromatic vinyl compound which not only inhibits an initial polymerization but also inhibits efficiently polymerization over a long period of time and which is excellent in the handleability. The present invention relates to a process for inhibiting polymerization of an aromatic vinyl compound which comprises adding a nitrogenous aromatic compound in combination with a sulfonic acid compound to the aromatic vinyl compound during the production, purification, storage or transportation.

Abstract: A water treating agent is constituted by blending water as a main component with a coating film forming agent of which a coating film is formed on the heat transfer surface of a boiler tube, a oxygen scavenger, a scale inhibitor, and a pH adjustor in such a manner that the general corrosion and local corrosion of the heat transfer surface of the boiler tube can be prevented and excellent heat transfer property can be obtained. The water treating agent is injected into boiler feed water to perform the prevention of the corrosion of the heat transfer surface of the boiler tube and the suppression of the scaling of the heat transfer surface in a balanced manner. Thus, a coating film capable of suppressing corrosion is formed of the coating film forming agent on the heat transfer surface of the boiler tube. Dissolved oxygen in boiler feed water is removed by the oxygen scavenger.

Abstract: [PROBLEMS] To provide: a method by which the generation of a copolymer of an aromatic vinyl compound and either the divinylbenzene generated in the production of the aromatic vinyl compound or the divinylbenzene which has come into the system together with a raw material for the aromatic vinyl compound is inhibited in the steps of distilling, purifying, and storing the aromatic vinyl compound: and a method of inhibiting the copolymer from depositing on and thus fouling devices and facilities. [MEANS FOR SOLVING PROBLEMS] The method of inhibiting the generation of a copolymer of divinylbenzene and an aromatic vinyl compound is characterized in that a dinitrophenol compound (A), a sulfonic acid compound (B), and a p-phenylenediamine compound (C) are simultaneously used in the steps of producing, purifying and storing the aromatic vinyl compound.

Abstract: According to the present invention, there is provided a process for inhibiting the polymerization of an aromatic vinyl compound which is capable of efficiently inhibiting the polymerization of an aromatic vinyl compound not only in an initial stage but also over a long term in the stage of producing, purifying, storing or transporting the aromatic vinyl compound, and which is excellent in handling. The present invention relates to a process for inhibiting the polymerization of an aromatic vinyl compound which requires the step of adding a 2-nitrophenol compound in combination with a sulfonic acid compound to the aromatic vinyl monomer during the stage of producing, purifying, storing or transporting the aromatic vinyl compound.

Abstract: Computers PC of n stations, each equipped with a storage device to accommodate the data to be cross-correlated, are connected to a line concentrator or communications network that has a switching function. The data allocated to each computer can be divided into n or more partial data, and each partial data is assigned to perform the cross correlation operation to each computer. Furthermore, in PC's connected in such a manner that data can be transmitted via a line concentrator or communication network, mutually between 2 PC's connected each other, the step of transmiting partial data from the PC to the partner PC connected to the PC is repeated. Thereby, it is possible to effectively distribute data as an object of the cross correlation operation stored in multiple storage devices of PC's to each PC.

Abstract: According to the present invention, there are provided a polymerization inhibitor which is easy to handle and which has a little toxicity and a high polymerization-inhibitory effect toward an aromatic vinyl compound and a process for inhibiting the polymerization of the aromatic vinyl compound. The present invention relates to a polymerization inhibitor for the aromatic vinyl compound which comprises contain two ingredients of a specific quinone methide compound and a specific organic sulfonic acid compound, and to a process for inhibiting polymerization of the aromatic vinyl compound which comprises adding a specific quinone methide compound and a specific organic sulfonic acid compound simultaneously or further a specific quinone methide compound, a specific organic sulfonic acid compound and a specific N-oxyl compound simultaneously in the stage of producing, purifying, storing or transporting the aromatic vinyl compound.