Abstract: A gas meter system is configured to: derive a unit heating value of a gas passing through a first gas meter; and estimate a heating value of a gas passing through a second gas meter provided separately from the first gas meter based on the heating value of the gas of the first gas meter that is arranged within a predetermined range with respect to the second gas meter on a gas supply pipe configured to supply the gas. The gas meter system and a heating value estimation method can estimate a heating value of a gas with high accuracy.

Abstract: A gas meter system includes a gas meter, a gas production plant, and a center device. The gas meter includes a sound velocity derivation unit configured to derive a sound velocity of a gas supplied to a demand place. The gas production plant includes: a gas production unit configured to produce the gas; and a gas characteristic identification unit configured to identify a gas characteristic representing a relationship between the sound velocity and a heating value of the gas based on an analysis result of a component of the gas produced by the gas production unit. The center device includes a gas heating value derivation unit configured to derive the heating value of the gas passing through the gas meter based on the derived sound velocity of the gas, and on the gas characteristic identified by the gas characteristic identification unit of the gas production plant.

Abstract: A heating value derivation device includes a sound velocity derivation unit configured to derive a sound velocity of a gas flowing through a gas flow path, and a heating value derivation unit configured to refer to correspondence relationship information to derive a heating value per unit volume of the gas.

Abstract: A gas meter system is configured to: derive a unit heating value of a gas passing through a first gas meter; and estimate a heating value of a gas passing through a second gas meter provided separately from the first gas meter based on the heating value of the gas of the first gas meter that is arranged within a predetermined range with respect to the second gas meter on a gas supply pipe configured to supply the gas. The gas meter system and a heating value estimation method can estimate a heating value of a gas with high accuracy.

Abstract: A gas meter system includes a gas meter, a gas production plant, and a center device. The gas meter includes a sound velocity derivation unit configured to derive a sound velocity of a gas supplied to a demand place. The gas production plant includes: a gas production unit configured to produce the gas; and a gas characteristic identification unit configured to identify a gas characteristic representing a relationship between the sound velocity and a heating value of the gas based on an analysis result of a component of the gas produced by the gas production unit. The center device includes a gas heating value derivation unit configured to derive the heating value of the gas passing through the gas meter based on the derived sound velocity of the gas, and on the gas characteristic identified by the gas characteristic identification unit of the gas production plant.

Abstract: A heating value derivation device and a heating value derivation method. A gas meter as a heating value derivation device includes a sound velocity derivation unit configured to derive a sound velocity of a gas flowing through a gas flow path, a heating value derivation unit configured to refer to correspondence relationship information that enables a heating value per unit volume to be uniquely derived from the sound velocity of the gas, to thereby derive the heating value per unit volume of the gas, which is independent of a type of the gas, based on the sound velocity derived by the sound velocity derivation unit, and a flow rate derivation unit configured to derive a flow rate of the gas that has passed through the gas flow path. Thus, a passage heating value of the gas can be derived.

Abstract: There is disclosed a fuel electrode of solid oxide fuel cells which is made of a cermet composed of yttria-stabilized zirconia containing a transition metal dissolved therein and nickel (Ni) or a cermet composed of yttria-stabilized zirconia containing a transition metal dissolved therein, nickel (Ni) and cerium oxide containing a divalent or trivalent metal dissolved therein, and which can be obtained by adding a solution of a metallo-organic compound of yttrium (Y) and a solution of a metallo-organic transition-metal compound to a solution of a metallo-organic compound of zirconium (Zr) to prepare a mixed solution of metallo-organic compounds of Zr—Y-transition metal; adding NiO powder or a powder mixture of NiO powder with cerium oxide powder containing a divalent or trivalent metal oxide dissolved therein to the mixed solution of the metallo-organic compounds to prepare a slurry; and subjecting the slurry to hydrolysis, polycondensation, pyrolysis, annealing and reduction successively.

Abstract: An air fuel ratio controlling apparatus for an internal combustion engine, comprises: a catalytic converter, provided in an exhaust system for purifying an exhaust gas of the engine; a first oxygen density sensor, provided upstream from the catalytic converter in the exhaust system, responsive to a first oxygen density of a first exhaust gas of the engine for detecting whether an air fuel ratio of the engine is in a rich condition or a lean condition with respect to a theoretical air fuel ratio of the engine; a second oxygen density sensor, provided downstream from the catalytic converter in the exhaust system, responsive to a second oxygen density of a second exhaust gas passed through the catalytic converter for detecting whether the air fuel ratio of the engine is in a rich or a lean condition with respect to a theoretical air fuel ratio of the engine; and an air fuel ratio control portion for controlling the air fuel ratio in accordance with the detection results of the first and second oxygen sensors, wh

Abstract: A method and apparatus for controlling and improving the air-fuel ratio of a gas engine by controlling the air-fuel ratio on an exhaust purifying apparatus such as a three way catalyst in use with the gas engine. The method involves the steps of modulating a vibrational drive current for driving a bypass value with waveforms such as rectangular wave, sinusoidal wave, triangular wave, etc., with predetermined periods and amplitudes, in response to signals transmitted from a main oxygen sensor and a pressure sensor.

Abstract: A passive gas sampling apparatus for detecting an analyte gas, which apparatus includes (1) a shell enclosing an adsorbent and (2) a diffusion tube extending through the shell and having (a) an inlet opening means outside the shell, through which the analyte gas may enter the diffusion tube, and (b) an outlet opening imbedded in the adsorbent inside the shell; and a method for using such apparatus.

Abstract: An apparatus for detecting or measuring the concentration of an analyte gas in a gas sample, which apparatus comprises a donor polymer and a halogen-containing compound positioned to contact the analyte gas and capable of reacting with the analyte gas to yield halogen; and a method for using the apparatus.