Abstract: A ship includes a main pipe that guides CNG whose pressure is increased by an LNG pump to the engine; a pressure sensor that measures the pressure of CNG to be supplied to the engine; a pressure adjustment valve that adjusts the pressure of the CNG to a set pressure according to engine load; a differential pressure sensor that measures a differential pressure before and after the pressure adjustment valve; and a buffer tank that absorbs a variable pressure of the CNG in the main pipe. The discharge pressure of the LNG pump is controlled such that the differential pressure is increased when the pressure is low, and the differential pressure is decreased when the pressure is high.

Abstract: A gas-fired engine that supplies high-pressure liquefied gas (e.g., LNG) as fuel by a reciprocating pump. A gas fuel supply device includes: a reciprocating pump driven by a hydraulic motor to boost an introduced liquefied gas pressure to a desired pressure and discharge the liquefied gas; a hydraulic oil introduction line that introduces a portion of high-pressure hydraulic oil from a hydraulic oil line and supplies the high-pressure hydraulic oil to the hydraulic motor; a hydraulic oil return line that returns the high-pressure hydraulic oil to the hydraulic oil line; a heating unit that heats and gasifies the boosted liquefied gas; a control section that adjusts a rotational speed of the hydraulic motor to maintain constant a gas fuel outlet pressure of the heating unit; and an engine inlet gas pressure-reducing valve that regulates a gas fuel pressure injected into a combustion chamber.

Abstract: A gas-fired engine which supplies high-pressure liquefied gas (e.g., LNG) as fuel by a reciprocating pump. A gas fuel supply device includes: a reciprocating pump driven by a hydraulic motor to boost an introduced liquefied gas pressure to a desired pressure and discharge the liquefied gas; a hydraulic oil introduction line that introduces a portion of high-pressure hydraulic oil from a hydraulic oil line and supplies the high-pressure hydraulic oil to the hydraulic motor; a hydraulic oil return line that returns the high-pressure hydraulic oil to the hydraulic oil line; a heating unit that heats and gasifies the boosted liquefied gas; a control section that adjusts a rotational speed of the hydraulic motor to maintain constant a gas fuel outlet pressure of the heating unit; and an engine inlet gas pressure-reducing valve that regulates a gas fuel pressure injected into a combustion chamber.

Abstract: A ship includes a main pipe that guides CNG whose pressure is increased by an LNG pump to the engine; a pressure sensor that measures the pressure of CNG to be supplied to the engine; a pressure adjustment valve that adjusts the pressure of the CNG to a set pressure according to engine load; a differential pressure sensor that measures a differential pressure before and after the pressure adjustment valve; and a buffer tank that absorbs a variable pressure of the CNG in the main pipe. The discharge pressure of the LNG pump is controlled such that the differential pressure is increased when the pressure is low, and the differential pressure is decreased when the pressure is high.

Abstract: A liquefied gas reliquefier reliquefies boil-off gas resulting from evaporation of liquefied gas in a liquefied-gas storage tank to prevent a rise in the internal pressure of the liquefied-gas storage tank. The liquefied gas reliquefier includes a cooling unit for liquefying a secondary refrigerant, a liquefied-secondary-refrigerant feeding unit for feeding the liquefied secondary refrigerant, and a heat exchange unit disposed in the secondary-refrigerant circulating channel to condense the BOG by heat exchange between the BOG and the liquefied secondary refrigerant. The heat exchange unit is disposed near the liquefied-gas storage tank. The cooling unit includes a plurality of pulse-tube refrigerators. The number of pulse-tube refrigerators in operation and/or the cooling capacities of the individual pulse-tube refrigerators are controlled based on a measurement result from at least one of a thermometer, a pressure gauge, and a pump discharge flow meter installed in the liquefied-gas storage tank.

Abstract: A gas-fired engine that supplies high-pressure liquefied gas (e.g., LNG) as fuel by a reciprocating pump. A gas fuel supply device includes: a reciprocating pump driven by a hydraulic motor to boost an introduced liquefied gas pressure to a desired pressure and discharge the liquefied gas; a hydraulic oil introduction line that introduces a portion of high-pressure hydraulic oil from a hydraulic oil line and supplies the high-pressure hydraulic oil to the hydraulic motor; a hydraulic oil return line that returns the high-pressure hydraulic oil to the hydraulic oil line; a heating unit that heats and gasifies the boosted liquefied gas; a control section that adjusts a rotational speed of the hydraulic motor to maintain constant a gas fuel outlet pressure of the heating unit; and an engine inlet gas pressure-reducing valve that regulates a gas fuel pressure injected into a combustion chamber.

Abstract: A liquefied gas reliquefier that can be configured compactly and that is easy to handle is provided. A liquefied gas reliquefier (1) reliquefies BOG resulting from evaporation of LNG in a cargo tank (3). The liquefied gas reliquefier (1) includes a refrigerator group (20) disposed in a secondary-refrigerant circulating channel (24) through which nitrogen, which has a lower condensation temperature than the BOG, circulates to liquefy the nitrogen; a feed pump (22) for feeding the liquid nitrogen cooled by the refrigerator group (20) through the secondary-refrigerant circulating channel (24); and a heat exchanger (12) disposed in the secondary-refrigerant circulating channel (24) to condense the BOG by heat exchange between the BOG and the liquid nitrogen fed by the feed pump (22). The heat exchanger (12) is disposed near the cargo tank (3).

Abstract: In a broadcasting receiver, to quickly switch channels of the received multiplexed broadcasting signals at a high response speed to improve the convenience for a viewer, when broadcasting signals of a plurality of channels are to be code-division-multiplexed and broadcasted from a ground broadcasting station (BC1, BC2) to a broadcasting receiver (MS) in a service area via a geostationary satellite (SAT), the broadcasting signals are multiplexed and transmitted after matching the spreading code phase between the channels in the ground broadcasting station (BC1, BC2). Alternatively, the spreading code phase difference between the channels of a CDM broadcasting signal arriving from the ground broadcasting station (BC1, BC2) is detected in the geostationary satellite (SAT), and the broadcasting signal is transmitted to the broadcasting receiver (MS) after matching the spreading code phase between the channels on the basis of the detection result.

Abstract: An apparatus for controlling the pressure in a cargo tank 1 supplies BOG generated from liquefied natural gas stored in the cargo tank 1 to a burning system 6 through a compressor. In this apparatus, a reliquefaction plant 5 is disposed on the downstream side of first and second compressors 3 and 4 and on the upstream side of the cargo tank 1 so that BOG discharged from the second compressor 4 is liquefied by the reliquefaction plant 5 and the liquefied fluid is returned again into the cargo tank 1.

Abstract: A pressure control device of a cargo tank (1) for supplying the BOG of the stored liquefied natural gas producing inside the cargo tank to a incineration treating system (6) through compressors so as to control a pressure in the cargo tank (1), wherein a re-liquefying device (5) is disposed on the downstream side of the first and second compressors (3, 4), i.e.

Abstract: In a broadcasting receiver, to quickly switch channels of the received multiplexed broadcasting signals at a high response speed to improve the convenience for a viewer, when broadcasting signals of a plurality of channels are to be code-division-multiplexed and broadcasted from a ground broadcasting station (BC1, BC2) to a broadcasting receiver (MS) in a service area via a geostationary satellite (SAT), the broadcasting signals are multiplexed and transmitted after matching the spreading code phase between the channels in the ground broadcasting station (BC1, BC2). Alternatively, the spreading code phase difference between the channels of a CDM broadcasting signal arriving from the ground broadcasting station (BC1, BC2) is detected in the geostationary satellite (SAT), and the broadcasting signal is transmitted to the broadcasting receiver (MS) after matching the spreading code phase between the channels on the basis of the detection result.

Abstract: In a broadcasting receiver, to quickly switch channels of the received multiplexed broadcasting signals at a high response speed to improve the convenience for a viewer, when broadcasting signals of a plurality of channels are to be code-division-multiplexed and broadcasted from a ground broadcasting station (BC1, BC2) to a broadcasting receiver (MS) in a service area via a geostationary satellite (SAT), the broadcasting signals are multiplexed and transmitted after matching the spreading code phase between the channels in the ground broadcasting station (BC1, BC2). Alternatively, the spreading code phase difference between the channels of a CDM broadcasting signal arriving from the ground broadcasting station (BC1, BC2) is detected in the geostationary satellite (SAT), and the broadcasting signal is transmitted to the broadcasting receiver (MS) after matching the spreading code phase between the channels on the basis of the detection result.

Abstract: A clock test apparatus connected to a GPS receiver mounted in a moving body has a frequency counter which counts clocks output from a clock generator incorporated in the GPS receiver for a predetermined period of time. In this manner, a clock frequency is detected and supplied to a clock error identification section. The clock error identification section calculates a short-term stability from the clock frequency, and further calculates a clock error on the basis of the short-term stability. The clock error data is supplied to a dynamics simulator. The dynamics simulator simulates circuit dynamics of the GPS receiver, and models error in the velocity of the moving body relative to a satellite, which results from the clock error, on the basis of the clock error data, thereby analyzing the performance of the GPS receiver.