Abstract: [Problem to be Solved] To provide an antenna which can be used in a wide band. [Solution] An antenna 10A includes a dielectric substrate 11, an unbalanced power supply member 12 having a non-power supply unit 23 and a power supply unit 24, a resonance conductor 13 having a connection area 26, a first resonance area 27 and a second resonance area 28, a grounding conductor 14 having a first ground area 32 and a second ground area 33, and a radiation conductor 15 having a first radiation area 37 and a second radiation area 38. At the antenna 10A, first to third radiation stepped portions 42a to 42c are formed at a first rear end portion 41 of the second radiation area 38, and first to third radiation stepped portions 44a to 44c are formed at a second rear end portion 43 of the second radiation area 38.

Abstract: [Problem to be Solved] To provide an antenna which can be used in a wide band. [Solution] An antenna 10A includes a dielectric substrate 11, an unbalanced power supply member 12 having a non-power supply unit 23 and a power supply unit 24, a resonance conductor 13 having a connection area 26, a first resonance area 27 and a second resonance area 28, a grounding conductor 14 having a first ground area 32 and a second ground area 33, and a radiation conductor 15 having a first radiation area 37 and a second radiation area 38. At the antenna 10A, first to third radiation stepped portions 42a to 42c are formed at a first rear end portion 41 of the second radiation area 38, and first to third radiation stepped portions 44a to 44c are formed at a second rear end portion 43 of the second radiation area 38.

Abstract: A memory system includes a non-volatile memory, a compressor capable of compressing data, an encryptor which encrypts data, a decryptor which decrypts data, and a data flow controller. The data flow controller is configured to perform first and second processes. In the first process, the data flow controller causes the encryptor to encrypt user data received from a host in a non-compressed state, and causes the encrypted user data to be written into the non-volatile memory via the second area. In the second process, the data flow controller causes the encrypted user data to be read out from the non-volatile memory, causes the decryptor to decrypt the encrypted user data, causes the compressor to compress the decrypted user data, causes the encryptor to encrypt the compressed user data, and causes the encrypted and compressed user data to be written into the non-volatile memory.

Abstract: A memory system includes a non-volatile memory, a compressor capable of compressing data, an encryptor which encrypts data, a decryptor which decrypts data, and a data flow controller. The data flow controller is configured to perform first and second processes. In the first process, the data flow controller causes the encryptor to encrypt user data received from a host in a non-compressed state, and causes the encrypted user data to be written into the non-volatile memory via the second area. In the second process, the data flow controller causes the encrypted user data to be read out from the non-volatile memory, causes the decryptor to decrypt the encrypted user data, causes the compressor to compress the decrypted user data, causes the encryptor to encrypt the compressed user data, and causes the encrypted and compressed user data to be written into the non-volatile memory.

Abstract: It is an object of the present invention, which has been made in view of the above-mentioned state of the art, to provide a cement admixture capable of improving the water-reducing ability of cement compositions and the like and enhancing the strength and durability of hardened products produced therefrom and further capable of adjusting the viscosity of such compositions so as to facilitate the works at the sites of handling the same, as well as a method of producing such cement additive. A cement admixture comprising a polycarboxylic acid polymer and a nitrogen atom-containing compound having non-amide bond, wherein the mass ratio (A/B) between the mass (A) of said polycarboxylic acid polymer and the mass (B) of said nitrogen atom-containing compound having non-amide bond satisfies the relation 200>(A/B)>1.

Abstract: The polycarboxylic acid concrete admixture of the present invention exhibits properties such as decreasing the concrete viscosity, improving the slump-retaining ability, and suppressing bleeding water, and is improved in the ability to cement compositions or the like. The above-mentioned polycarboxylic acid concrete admixture comprises a polycarboxylic acid polymer containing a polyalkylene glycol in the side chain, wherein the polycarboxylic acid polymer is obtained by polymerizing monomer components containing an alkyl (meth)acrylate monomer and a specific polyalkylene glycol unsaturated monomer and unsaturated carboxylic acid (salt) monomer, and it has a specific weight average molecular weight.

Abstract: It is an object of the present invention to provide a polycarboxylic acid polpolymer which improves the water reducing capacity and workability of cement compositions and the like and making them easier to handle when the fluidity and water reducing capacity are at the same levels, a method of producing the copolymer, and a cement additive and a cement composition comprising the copolymer. The present invention is further to provide a polycarboxylic acid copolymer and a cement additive which are capable of improving the strength and durability of hardening products of cement compositions, hence can advantageously be used in ultrahigh strength concrete. The present invention is polycarboxylic acid copolymers having high water reducing capacity, reducing the viscosity of cement compositions and improving the workability in applying cement.

Abstract: The polycarboxylic acid concrete admixture of the present invention exhibits properties such as decreasing the concrete viscosity, improving the slump-retaining ability, and suppressing bleeding water, and is improved in the ability to cement compositions or the like. The above-mentioned polycarboxylic acid concrete admixture comprises a polycarboxylic acid polymer containing a polyalkylene glycol in the side chain, wherein the polycarboxylic acid polymer is obtained by polymerizing monomer components containing an alkyl (meth)acrylate monomer and a specific polyalkylene glycol unsaturated monomer and unsaturated carboxylic acid (salt) monomer, and it has a specific weight average molecular weight.

Abstract: The cement admixture of the present invention can provide viscosity decreasing ability as well as a high dispersing ability and slump loss preventing ability even in a high water reducing ratio range. The above-mentioned cement admixture comprises three components of a copolymer (A) containing a constituent unit (I) derived from the unsaturated (poly)alkylene glycol ether monomer (a) and a constituent unit (II) derived from a maleic acid monomer (b), a specific unsaturated (poly)alkylene glycol ether monomer (a) and a non-polymerizable (poly)alkylene glycol (B) having no alkenyl group.

Abstract: The cement admixture of the present invention can improve the workability by displaying sufficient viscosity decreasing ability and initial dispersing ability even under a low temperature environment as well as high dispersing ability and dispersion retaining ability even in a high water reducing ratio range. The above-mentioned cement admixture comprises four components of a copolymer (A) containing a constituent unit (I) derived from the unsaturated (poly)alkylene glycol ether monomer (a) and a constituent unit (II) derived from a maleic acid monomer (b), a specific unsaturated (poly)alkylene glycol ether monomer (a), a non-polymerizable (poly)alkylene glycol (B) having no alkenyl group, and a polymer (C) having an oxyalkylene group or a polyoxyalkylene group and a carboxyl group, which is different from the copolymer (A).

Abstract: A rewritable information storage medium includes a user area for storing user data, a spare area serving as a replacement area for storing user data that was unable to be stored in the defective area, and a plurality of defect management areas. The same defect management information is stored in the plurality of defect management areas. Even when all errors of the plurality of defect management areas are uncorrectable on a predetermined data unit basis, in the case where the error of the defect management information stored in any one of the defect management areas is correctable on a data unit basis smaller than the predetermined data unit, the defect management information is compensated for on the basis of the smaller data unit.

Abstract: An information recording-reproducing apparatus includes a recording-reproducing unit configured to record information given by encoding the data in predetermined data blocks with an error correction code, the data blocks being generated by multiplexing information indicating the positions of the defect management areas, on the information storage medium and to decode the encoded information with the error correction code and reproduce the decoded information and a complementary unit configured to complement the information indicating the positions of the defect management areas on the basis of the data in data units smaller than the data blocks, when an error can be corrected in the data units or when no error is detected even if the error correction in the data blocks cannot be performed for the information that is encoded and recorded.

Abstract: It is an object of the present invention to provide a cement admixture capable of exhibiting high cement dispersing ability at low addition levels, in particular capable of displaying excellent initial dispersing ability and dispersion retaining ability even in a high water reducing ratio range, and a cement composition in which this admixture is used.

Abstract: A plurality of defect management areas (DMA set groups 1 to N) are used in a ring form in such a manner that defect management information of the DMA replaces and is recorded in the next spare area while the DMA is supposed to be still sufficiently rewritable (e.g., currently used DMA sets #1-1 to #4-1 are replaced with the next DMA sets #1-2 to #4-2), and a process returns to a first defect management area again at a time when transition of the defect management information ends up to a last spare area (DMA sets #1-N to #4-N).

Abstract: It is an object of the present invention to provide a production method of a dehydration reaction product by which the occurrence of troubles in the production step or the degradation in performance characteristics or quality of various chemical products can be suppressed to a satisfactory extent. A production method of a dehydration reaction product which comprises a dehydration reaction step of subjecting a reaction solution containing a polymerizable compound to the dehydration reaction, said dehydration reaction step comprising using a dehydration reaction apparatus, said dehydration reaction apparatus comprising a reaction vessel, a condenser and a connecting pipe joining said reaction vessel with said condenser and satisfying the requirement: 0.05<(B3/A)<35 where A is a capacity (m3) of said reaction vessel and B is a total length (m) of said connecting pipe on the horizontal basis.

Abstract: It is an object of the present invention to provide a cement admixture which can show not only a high dispersing ability and a slump loss preventing effect but also a viscosity reducing effect and can show these characteristics even in the high water reduction ratio range, and a cement composition in which this admixture is used.

Abstract: It is an object of the present invention to provide a polycarboxylic acid polpolymer which improves the water reducing capacity and workability of cement compositions and the like and making them easier to handle when the fluidity and water reducing capacity are at the same levels, a method of producing the copolymer, and a cement additive and a cement composition comprising the copolymer. The present invention is further to provide a polycarboxylic acid copolymer and a cement additive which are capable of improving the strength and durability of hardening products of cement compositions, hence can advantageously be used in ultrahigh strength concrete. The present invention is polycarboxylic acid copolymers having high water reducing capacity, reducing the viscosity of cement compositions and improving the workability in applying cement.

Abstract: It is an object of the present invention to provide a polycarboxylic acid copolymer which improves the water reducing capacity and workability of cement compositions and the like and making them easier to handle when the fluidity and water reducing capacity are at the same levels, a method of producing the copolymer, and a cement additive and a cement composition comprising the copolymer. The present invention is further to provide a polycarboxylic acid copolymer and a cement additive which are capable of improving the strength and durability of hardening products of cement compositions, hence can advantageously be used in ultrahigh strength concrete. The present invention is still further to provide a method of producing polycarboxylic acid copolymers having high water reducing capacity, reducing the viscosity of cement compositions and improving the workability in applying cement.

Abstract: It is an object of the present invention, which has been made in view of the above-mentioned state of the art, to provide a cement admixture capable of improving the water-reducing ability of cement compositions and the like and enhancing the strength and durability of hardened products produced therefrom and further capable of adjusting the viscosity of such compositions so as to facilitate the works at the sites of handling the same, as well as a method of producing such cement additive.

Abstract: The present invention is to provide a production method of chemical reactive substances with stable quality by which solidification, gel formation, and the resulting blockade within material injection nozzles are prevented, and contamination of a reaction system with the gelled matter is prevented, as well as occurrence of problems on a production process due to the gelled matter is suppressed, when the chemical reactive substances are produced by injecting the liquid materials containing reactive substances having unsaturated double bonds into the reaction vessel through the material injection nozzles of the reaction vessel. The present invention is a production method of a chemical reactive substance which comprises injecting a liquid material containing a reactive substance having an unsaturated double bond into a reaction vessel through a material injection nozzle of said reaction vessel and causing a reaction at a reaction temperature of not less than 50° C.