Abstract: A steel contains, in a chemical composition, C, Si, Mn, and Al, and contains pearlite as a metallographic structure, and a value obtained by dividing an Mn content in a cementite in the pearlite in terms of at % by an Mn content in a ferrite in the pearlite in terms of at % is higher than 0 and equal to or lower than 5.0.

Abstract: A steel contains, in a chemical composition, C, Si, Mn, and Al, and contains pearlite as a metallographic structure, and a value obtained by dividing an Mn content in a cementite in the pearlite in terms of at % by an Mn content in a ferrite in the pearlite in terms of at % is higher than 0 and equal to or lower than 5.0.

Abstract: A non-oriented electrical steel sheet comprising, Si: not less than 1.0 mass % nor more than 3.5 mass %, Al: not less than 0.1 mass % nor more than 3.0 mass %, Ti: not less than 0.001 mass % nor more than 0.01 mass %, Bi: not less than 0.001 mass % nor more than 0.01 mass %, wherein Expression (1) is satisfied when a Ti content (mass %) is represented as [Ti] and a Bi content (mass %) is represented as [Bi]: [Ti]?0.8×[Bi]+0.002 . . . (1).

Abstract: A non-oriented electrical steel sheet comprising, Si: not less than 1.0 mass % nor more than 3.5 mass %, Al: not less than 0.1 mass % nor more than 3.0 mass %, Ti: not less than 0.001 mass % nor more than 0.01 mass %, Bi: not less than 0.001 mass % nor more than 0.01 mass %, wherein Expression (1) is satisfied when a Ti content (mass %) is represented as [Ti] and a Bi content (mass %) is represented as [Bi]: [Ti]?0.8×[Bi]+0.002 . . . (1).

Abstract: In a non-oriented electrical steel sheet, Si: not less than 1.0 mass % nor more than 3.5 mass %, Al: not less than 0.1 mass % nor more than 3.0 mass %, Ti: not less than 0.001 mass % nor more than 0.01 mass %, Bi: not less than 0.001 mass % nor more than 0.01 mass %, and so on are contained. (1) expression described below is satisfied when a Ti content (mass %) is represented as [Ti] and a Bi content (mass %) is represented as [Bi]. [Ti]?0.8×[Bi]+0.

Abstract: A non-oriented electrical steel sheet, containing: C: 0.01 mass % or less; Si: 1.0 mass % or more and 3.5 mass % or less; Al: 0.1 mass % or more and 3.0 mass % or less; Mn: 0.1 mass % or more and 2.0 mass % or less; P: 0.1 mass % or less; S: 0.005 mass % or less; Ti: 0.001 mass % or more and 0.01 mass % or less; N: 0.005 mass % or less; and Y: more than 0.05 mass % and 0.2 mass % or less, with the balance being iron and inevitable impurities.

Abstract: A non-oriented electrical steel sheet, containing: C: 0.01 mass % or less; Si: 1.0 mass % or more and 3.5 mass % or less; Al: 0.1 mass % or more and 3.0 mass % or less; Mn: 0.1 mass % or more and 2.0 mass % or less; P: 0.1 mass % or less; S: 0.005 mass % or less; Ti: 0.001 mass % or more and 0.01 mass % or less; N: 0.005 mass % or less; and Y: more than 0.05 mass % and 0.2 mass % or less, with the balance being iron and inevitable impurities.

Abstract: A gas charge container includes a sample holder which holds a needle-shaped material, a deutrium gas supply portion which charges a deutrium gas into the needle-shaped material held by the sample holder, and a heating portion which heats the needle-shaped material held by the sample holder. The needle-shaped material is cooled by blocking the heat generated by the heating portion after the needle-shaped material is heated by the heating portion.

Abstract: A lead-free solder alloy exhibiting good performance in impact resistance and vibration resistance. Also provided are a solder ball using such a lead-free solder alloy, and an electronic member having a solder bump using such a lead-free alloy. Specifically, the lead-free solder alloy consists of 1.0 to 2.0% by mass of Ag, 0.3 to 1.0% by mass of Cu, 0.005 to 0.1% by mass of Ni and the balance including Sn and unavoidable impurities. In an Sn—Ag—Cu based solder joint portion on a Cu electrode, a Cu3Sn intermetallic compound layer is formed directly on the Cu electrode, and then a Cu6Sn5 intermetallic compound layer is formed thereon. A Cu atomic site in the Cu6Sn5 intermetallic compound layer is replaced by Ni having a smaller atomic radius than Cu to thereby reduce strain in the Cu6Sn5 intermetallic compound layer, thus enabling impact resistance and vibration resistance to be improved therein.

Abstract: The present invention releases a method of producing a metal separator for a solid polymer fuel cell by stainless steel, titanium, or titanium alloy during which securing lower cost and mass producibility by using a material having a high workability to form a complicated shape by a high productivity, then using an inexpensive blast process to drive a conductive substance into the surface of the metal separator member, that is, provides a stainless steel, titanium, or titanium alloy solid polymer fuel cell separator comprised of stainless steel, titanium, or titanium alloy in the surface of which a low ion release conductive substance is buried, having an arithmetic mean roughness (Ra) of the separator surface of 0.5 to 5.0 ?m, having a 10-point mean roughness (Rz) of 3 to 20 ?m, having an average spacing of surface relief shapes (Sm) of 300 ?m or less, having values of a warp rate and twist rate of a separator of 0.

Abstract: In a non-oriented electrical steel sheet, Si: not less than 1.0 mass % nor more than 3.5 mass %, Al: not less than 0.1 mass % nor more than 3.0 mass %, Ti: not less than 0.001 mass % nor more than 0.01 mass %, Bi: not less than 0.001 mass % nor more than 0.01 mass %, and so on are contained. (1) expression described below is satisfied when a Ti content (mass %) is represented as [Ti] and a Bi content (mass %) is represented as [Bi]. [Ti]?0.8×[Bi]+0.

Abstract: A gas charge container includes a sample holder which holds a needle-shaped material, a deutrium gas supply portion which charges a deutrium gas into the needle-shaped material held by the sample holder, and a heating portion which heats the needle-shaped material held by the sample holder. The needle-shaped material is cooled by blocking the heat generated by the heating portion after the needle-shaped material is heated by the heating portion.

Abstract: The present invention releases a method of producing a metal separator for a solid polymer fuel cell by stainless steel, titanium, or titanium alloy during which securing lower cost and mass producibility by using a material having a high workability to form a complicated shape by a high productivity, then using an inexpensive blast process to drive a conductive substance into the surface of the metal separator member, that is, provides a stainless steel, titanium, or titanium alloy solid polymer fuel cell separator comprised of stainless steel, titanium, or titanium alloy in the surface of which a low ion release conductive substance is buried, having an arithmetic mean roughness (Ra) of the separator surface of 0.5 to 5.0 ?m, having a 10-point mean roughness (Rz) of 3 to 20 ?m, having an average spacing of surface relief shapes (Sm) of 300 ?m or less, having values of a warp rate and twist rate of a separator of 0.

Abstract: The present invention releases a method of producing a metal separator for a solid polymer fuel cell by stainless steel, titanium, or titanium alloy during which securing lower cost and mass producibility by using a material having a high workability to form a complicated shape by a high productivity, then using an inexpensive blast process to drive a conductive substance into the surface of the metal separator member, that is, provides a stainless steel, titanium, or titanium alloy solid polymer fuel cell separator comprised of stainless steel, titanium, or titanium alloy in the surface of which a low ion release conductive substance is buried, having an arithmetic mean roughness (Ra) of the separator surface of 0.5 to 5.0 ?m, having a 10-point mean roughness (Rz) of 3 to 20 ?m, having an average spacing of surface relief shapes (Sm) of 300 ?m or less, having values of a warp rate and twist rate of a separator of 0.

Abstract: A lead-free solder alloy exhibiting good performance in impact resistance and vibration resistance. Also provided are a solder ball using such a lead-free solder alloy, and an electronic member having a solder bump using such a lead-free alloy. Specifically, the lead-free solder alloy consists of 1.0 to 2.0% by mass of Ag, 0.3 to 1.0% by mass of Cu, 0.005 to 0.1% by mass of Ni and the balance including Sn and unavoidable impurities. In an Sn—Ag—Cu based solder joint portion on a Cu electrode, a Cu3Sn intermetallic compound layer is formed directly on the Cu electrode, and then a Cu6Sn5 intermetallic compound layer is formed thereon. A Cu atomic site in the Cu6Sn5 intermetallic compound layer is replaced by Ni having a smaller atomic radius than Cu to thereby reduce strain in the Cu6Sn5 intermetallic compound layer, thus enabling impact resistance and vibration resistance to be improved therein.

Abstract: The IGBT drive signal to a power converter comprising power semiconductor elements, such as IGBT, is supplied by a PWM controller which performs pulse width modulation of voltage references. A DC offset voltage Vd is generated by a DC offset generator in accordance with the output frequency f and output phase &thgr;, and this voltage Vd and the voltage references are added together by adders 22-24, and supplied to the PWM controller to form IGBT drive signals. Thereby, it is possible to reduce the amount of loss generated by the power semiconductor elements used in the control device of a power converter for converting DC voltage to AC voltage, or AC voltage to DC voltage.

Abstract: In a power conversion device comprising an AC filter 2 for harmonic current suppression having a combination of at least some of a reactor, capacitor and resistance and a power conversion circuit 3 that converts AC power into DC power or DC power into AC power and is connected to an AC power source 1 through AC filter 2, by providing: voltage reference calculation means (unit) 5 that calculates and outputs a voltage reference corresponding to the voltage that is to be output by the power conversion device main unit; current detection means (unit) 4 that detects and outputs current flowing through a prescribed location between AC power source 1 and power conversion circuit 3; and voltage reference correction means (unit) 8 that uses the output from current detection means (unit) 4 as a voltage reference correction signal to correct the voltage reference that is output from voltage reference calculation means (unit) 5, resonance of the AC filter for harmonic current suppression is suppressed without employing a

Abstract: The IGBT drive signal to a power converter comprising power semiconductor elements, such as IGBT, is supplied by a PWM controller which performs pulse width modulation of voltage references. A DC offset voltage Vd is generated by a DC offset generator in accordance with the output frequency f and output phase &thgr;, and this voltage Vd and the voltage references are added together by adders 22-24, and supplied to the PWM controller to form IGBT drive signals. Thereby, it is possible to reduce the amount of loss generated by the power semiconductor elements used in the control device of a power converter for converting DC voltage to AC voltage, or AC voltage to DC voltage.

Abstract: In a power conversion device comprising an AC filter 2 for harmonic current suppression having a combination of at least some of a reactor, capacitor and resistance and a power conversion circuit 3 that converts AC power into DC power or DC power into AC power and is connected to an AC power source 1 through AC filter 2, by providing: voltage reference calculation means (unit) 5 that calculates and outputs a voltage reference corresponding to the voltage that is to be output by the power conversion device main unit; current detection means (unit) 4 that detects and outputs current flowing through a prescribed location between AC power source 1 and power conversion circuit 3; and voltage reference correction means (unit) 8 that uses the output from current detection means (unit) 4 as a voltage reference correction signal to correct the voltage reference that is output from voltage reference calculation means (unit) 5, resonance of the AC filter for harmonic current suppression is suppressed without employing a

Abstract: A multiple inverter system of the present invention is disclosed. It includes a plurality of input transformers having secondary windings and a plurality of unit inverter cells connected in series at n stages to compose respective phases and supply the electric power to a multiple phase load in combination with the input transformers. The input transformers have 3n sets of three-phase windings at the secondary side and the secondary windings of the transformers, which are out-of-phase at each phase, are connected to unit inverter cells of each phase at the n-th stages. Further, the present invention is provided with a bypass switch control to melt a fuse that is applicable to a unit inverter given with a circuit closing command by giving this circuit closing command to a bypass switch corresponding to applicable unit inverters in response to an operation abnormality detector and a DC abnormality detector.