Abstract: A battery measurement system includes: a battery including terminals and a housing case, and a battery measurement device. The battery measurement device includes: a signal control unit provided on a first electrical path connecting positive and negative electrode external terminals and configured to receive or apply an AC signal, a response signal input unit provided on a second electrical path connecting positive and negative electrodes of an electrode body and configured to receive a response signal to the AC signal, and a calculation unit configured to calculate complex impedance information based on the response signal. The second electrical path is wired from the response signal input unit toward the inside of the housing case so that a magnetic flux passage area surrounded by the electrode body and the second electrical path is smaller in magnitude than an area surrounded by the electrode body, the terminals and the housing case.

Abstract: A voltage-controlled oscillator includes a piezoelectric element, a first package, an electronic element, and a second package. The first package contains the piezoelectric element. The second package contains the electronic element and the first package. The second package includes a base, and a lid. The electronic element and the first package are mounted in the base. The lid hermetically seals the electronic element and the first package together with the base. The base includes a substrate part, a first frame part, and a second frame part. The substrate part includes a first major face and a second major face opposite to the first face. The electronic element is mounted on the first major face. The first frame part includes a first frame face on which the first package is mounted. The first frame part is located on a peripheral edge of the first major face.

Abstract: The CO2 removing apparatus includes a first reaction flow path and a second reaction flow path. The first reaction flow path includes a first reaction section in which a supplied gas is heated in the presence of a catalyst to cause a reaction, a raw material gas supply section supplying a raw material gas containing at least CH4 and CO2 to the first reaction section, a cooling unit for removing H2O from a mixed gas of a reaction product in the first reaction section, and a circulation flow path mixing the mixed gas passing through the cooling unit into the raw material gas to again supply the mixed gas to the first reaction section. The second reaction flow path is connected to the first reaction flow path so that part of the mixed gas is supplied thereto and includes a second reaction section that is heated in the presence of another catalyst to thereby react CO2 and CO with H2 in the mixed gas and to convert CO2 and CO to CH4.