Abstract: A polyimide precursor solution contains: an aqueous solvent containing water; particles; and a polyimide precursor, wherein the polyimide precursor has a high molecular weight region A containing a high molecular weight side maximum value and a low molecular weight region B containing a low molecular weight side maximum value in an elution curve obtained by gel permeation chromatography, a weight average molecular weight in the high molecular weight region A is 50,000 or more, a weight average molecular weight in the low molecular weight region B is 10,000 or more and 30,000 or less, and a value of a/(a+b) is 0.60 or more and 0.98 or less in which a represents an area of the high molecular weight region A and b represents an area of the low molecular weight region B.

Abstract: A dish washer/dryer includes a washing tub for accommodating an object to be washed, a washing section for washing the object to be washed, a heater for heating washing water, an exhaust port for discharging moisture inside the washing tub, an air blower for blowing outside-air, a mixing section disposed at an upstream side of the exhaust port and mixing the outside-air with washing-tub-inside-air, and an air volume distribution section for changing the feeding ratio of outside-air into the washing tub and the mixing section. This configuration provides a dish washer/dryer, in which a sufficient amount of outside-air is mixed with exhaust air in the washing tub so as to promote the temperature reduction of the exhaust air and the reduction of the moisture content in the exhaust air during drying operation, thereby enhancing the comfort of the exhaust air.

Abstract: An ultrasonic flow rate measuring device according to the present invention improves a measuring accuracy. An ultrasonic flow rate measuring device includes an ultrasonic measuring portion in which a first ultrasonic transmitter-receiver and a second ultrasonic transmitter-receiver are provided to a measurement passage, and first to fifth partitioning plates are set substantially in parallel with an ultrasonic wave propagation path that connects the first ultrasonic transmitter-receiver and the second ultrasonic transmitter-receiver, whereby first to sixth flat passages are laminated/formed in the measurement passage by the partitioning plates. In this ultrasonic flow rate measuring device, the first ultrasonic transmitter-receiver and the second ultrasonic transmitter-receiver are arranged such that the ultrasonic measuring portion 20 measures the flow rate of the flat passage that is offset from the center along the lamination direction of the flat passages.

Abstract: An ultrasonic fluid measuring device capable of improving a measuring accuracy is provided. An ultrasonic fluid measuring device 10 includes an ultrasonic measuring portion 20 in which a first ultrasonic transmitter-receiver 21 and a second ultrasonic transmitter-receiver 22 are provided to a measuring pass 14, and first to fifth pass partition plates 25 to 29 that are set in substantially parallel with an ultrasonic propagation path 24 that connects the first ultrasonic transmitter-receiver 21 and the second ultrasonic transmitter-receiver 22, whereby first to sixth flat passes 32 to 37 are laminated/formed in the measuring pass 14 by the pass partition plates 25 to 29.

Abstract: A dish washer/dryer includes a washing tub for accommodating an object to be washed, a washing section for washing the object to be washed, a heater for heating washing water, an exhaust port for discharging moisture inside the washing tub, an air blower for blowing outside-air, a mixing section disposed at an upstream side of the exhaust port and mixing the outside-air with washing-tub-inside-air, and an air volume distribution section for changing the feeding ratio of outside-air into the washing tub and the mixing section. This configuration provides a dish washer/dryer, in which a sufficient amount of outside-air is mixed with exhaust air in the washing tub so as to promote the temperature reduction of the exhaust air and the reduction of the moisture content in the exhaust air during drying operation, thereby enhancing the comfort of the exhaust air.

Abstract: An ultrasonic fluid measurement instrument is capable of highly accurate fluid measurement. A measurement part is provided forming a plurality of split channels partitioned by partition boards halfway across a fluid channel, and at least a pair of ultrasonic transmitter-receivers for transmitting ultrasonic waves into the fluid flowing through the split channels and receiving ultrasonic waves that have passed through the fluid. Further, an arithmetic unit calculates the flow velocity and/or flow volume of the fluid according to the propagation time of the ultrasonic waves. The measurement part further includes an approach channel for preliminarily rectifying the fluid flowing to the split channels.

Abstract: An ultrasonic fluid measurement instrument is capable of highly accurate fluid measurement. A measurement part is provided forming a plurality of split channels partitioned by partition boards halfway across a fluid channel, and at least a pair of ultrasonic transmitter-receivers for transmitting ultrasonic waves into the fluid flowing through the split channels and receiving ultrasonic waves that have passed through the fluid. Further, an arithmetic unit calculates the flow velocity and/or flow volume of the fluid according to the propagation time of the ultrasonic waves. The measurement part further includes an approach channel for preliminarily rectifying the fluid flowing to the split channels.

Abstract: An ultrasonic fluid measurement instrument is capable of highly accurate fluid measurement. A measurement part is provided forming a plurality of split channels partitioned by partition boards halfway across a fluid channel, and at least a pair of ultrasonic transmitter-receivers for transmitting ultrasonic waves into the fluid flowing through the split channels and receiving ultrasonic waves that have passed through the fluid. Further, an arithmetic unit calculates the flow velocity and/or flow volume of the fluid according to the propagation time of the ultrasonic waves. The measurement part further includes an approach channel for preliminarily rectifying the fluid flowing to the split channels.

Abstract: The present invention provides an ultrasonic fluid measurement instrument capable of highly accurate fluid measurement. Measurement part (1) is provided forming plural split channels (3) partitioned by partition boards (2) halfway across the fluid channel, and at least a pair of ultrasonic transmitter-receivers transmit ultrasonic waves into fluid flowing through split channels (3) and receive ultrasonic waves that have passed through the fluid. Then, an arithmetic unit calculates at least one of flow velocity and flow volume of the fluid according to the propagation time of the ultrasonic waves. Measurement part (1) is further provided with approach channels (5) and (6) for preliminarily rectifying fluid flowing to split channels (3).

Abstract: An ultrasonic flow meter of the present invention includes: a measurement flow path 6 through which a fluid to be measured flows; ultrasonic transducers 8 and 9 provided respectively on an upstream side and a downstream side with respect to each other along the measurement flow path 6; an upstream aperture hole 11 and a downstream aperture hole 12, the aperture holes 11 and 12 for exposing the ultrasonic transducers 8 and 9 to the measurement flow path 6; a first influent suppressor 15 provided in a vicinity of at least the downstream aperture hole 12 for reducing inflow of the fluid to be measured into the aperture hole 12; a second influent suppressor 16 provided on an upstream side of the measurement flow path 6 with respect to the aperture holes 11 and 12 for reducing the inflow of the fluid to be measured into the aperture holes 11 and 12; a measurement control section 19 for measuring a propagation time of an ultrasonic wave between the ultrasonic transducers 8 and 9; and a calculation section 20 for ca

Abstract: A gas leakage detection system includes a flow path, a dual mode valve disposed in the flow path, an ultrasonic measuring section including a pair of ultrasonic transducers, disposed in the flow path upstream from the dual mode valve, a flow rate calculation section for computing a flow rate based on a signal from the ultrasonic measuring section, and a control section for controlling the dual mode valve. The control section closes or opens the dual mode valve instantaneously, and the flow rate calculation section computes a flow rate when the dual mode valve is closed. Thus, gas leakage can be decided substantially without stopping a gas flow when a user is using the gas.

Abstract: A flow meter includes a flow path through which a fluid flows; a pair of transceivers for sending and receiving an ultrasonic wave propagating across the flow path; and a flow calculation section for calculating a flow rate of the fluid flowing through the flow path based on a result of the ultrasonic wave being sent and received by the pair of transceivers. The flow path has an equal flow speed area in which the fluid flows at a substantially equal flow speed over an entire flow rate area ranging from a high flow rate area to a low flow rate area. The pair of transceivers send and receive the ultrasonic wave so that the ultrasonic wave propagates in the equal flow speed area.

Abstract: A flow meter includes a flow path through which a fluid flows; a pair of transceivers for sending and receiving an ultrasonic wave propagating across the flow path; and a flow calculation section for calculating a flow rate of the fluid flowing through the flow path based on a result of the ultrasonic wave being sent and received by the pair of transceivers. The flow path has an equal flow speed area in which the fluid flows at a substantially equal flow speed over an entire flow rate area ranging from a high flow rate area to a low flow rate area. The pair of transceivers send and receive the ultrasonic wave so that the ultrasonic wave propagates in the equal flow speed area.

Abstract: An ultrasonic flowmeter includes a flow path defined by four wall sections, a flow measurement section, a calculation section and a pair of ultrasonic oscillators for transmitting and receiving an ultrasonic wave over a distance. The flow path is configured to reduce the influence of a phase difference, which results from the varying propagation distances of a direct wave and a reflected wave, by changing one or more of the flow measurement section configuration, the ultrasonic wave frequency, the orientation of the ultrasonic oscillators, and the distance between the pair of ultrasonic oscillators. A measurement section is suitably configured to measure the propagation time of the ultrasonic wave propagating between the pair of ultrasonic oscillators. Additionally, a calculation section is suitably configured to receive measurements from the measurement section and to calculate the fluid flow in the flow measurement section.