Mitsubishi Chemical Corporation

Yokogawa Electric Corporation

Naoki Noguchi

Kazuma Takenaka

Kotaro Ogawa

Minako Terao

Hiroshi Mikami

Saki Kobako

Makoto Nitta

Hirotsugi Tominaga

Fumiya Shimizu

Tetsuya Ishikawa

Satoshi Yoshitake

Fumitake Terao

A magnetic detection apparatus according to the present disclosure includes a magnetic sensor and a measurement apparatus. The magnetic sensor includes a first transmission line and a second transmission line arranged to be non-parallel to each other. The measurement apparatus includes a signal generator configured to generate a first incident wave and a second incident wave, a signal detector configured to detect a first reflected wave caused by an impedance mismatch of the first transmission line and a second reflected wave caused by an impedance mismatch of the second transmission line, and a controller. The controller calculates a first magnetic field based on the first incident wave and the first reflected wave and a second magnetic field based on the second incident wave and the second reflected wave and calculates a biaxial magnetic field based on the first magnetic field and the second magnetic field.

Magnetic detection apparatus, magnetic sensor, and magnetic detection method

A current measurement device (to) includes a first sensor (SE) configured to detect a direct current magnetic field and a low-frequency alternating current magnetic field generated by a current (I) flowing through a measurement target conductor (MC), a hollow magnetic shielding member () that includes a cutout portion (CP) into which the measurement target conductor is inserted and in which the first sensor is accommodated, a fixing mechanism () configured to fix the measurement target conductor such that a distance between a center of the measurement target conductor inserted into the cutout portion of the magnetic shielding member and the first sensor is a predetermined reference distance (r), and a first calculator () configured to calculate a current flowing through the measurement target conductor based on a detection result of the first sensor.

Current measurement device

A current measurement device includes: four or more triaxial magnetic sensors arranged to have predefined positional relationships such that magnetism-sensing directions thereof are parallel to each other; and a calculator configured to calculate currents flowing through a pair of conductors to be measured, which are arranged in proximity to each other, based on detection results of the four or more triaxial magnetic sensors and the positional relationships between the four or more triaxial magnetic sensors, the currents flowing in mutually opposite directions.

Current measurement device for measuring currents flowing in mutually opposite directions

The current measurement device () includes a first sensor (SE) configured to detect a direct current magnetic field and a low-frequency alternating current magnetic field generated due to the current () flowing through the conductor (MC) to be measured, a second sensor (SE) configured to detect alternating current magnetic fields from a low frequency to a high frequency generated due to the current (I) flowing through the conductor to be measured, a first calculator (A) configured to calculate the current flowing through the conductor to be measured from a detection result of the first sensor using distance information indicating a distance (r) between the first sensor (SE) and the conductor (MC) to be measured, a second calculator () configured to calculate the current flowing through the conductor to be measured from a detection result of the second sensor, and a synthesizer () configured to synthesize a calculation result of the first calculator with a calculation result of the second calculator.

Current measurement device, current measurement method, and non-transitory computer readable storage medium

A current measurement device (and) is for measuring a current (I) flowing through measurement target conductors (MCand MC), and the current measurement device includes: a plurality of triaxial magnetic sensors (, and) disposed so that a magnetic sensing direction and a relative position have a prescribed relationship; a noise remover () configured to remove noise components included in detection results of the plurality of triaxial magnetic sensors; a sign adder () configured to add a sign to the detection results from which the noise components have been removed, based on sign information of each of the detection results of the plurality of triaxial magnetic sensors obtained at a specific point in time; and a current calculator (and) configured to calculate a current flowing through the measurement target conductors by using the detection results to which the sign has been added by the sign adder.

A separation membrane module may decrease a bending load applied to a support member supporting ends of tubular separation membranes and omission of a seal member between the outer circumferential surface of the support member and the inner circumferential surface of a housing. The separation membrane module may include a tubular housing, tubular separation membranes arranged in a longitudinal direction of the housing, end tubes connected to lower ends of the tubular separation membranes, a support box supporting the end tubes, and a backpressure chamber below the support box. The tubular separation membranes may be in communication with a support box collection chamber. A nozzle disposed on the support box may extract permeated fluid. A chamber and the backpressure chamber are in communication via a gap between the support box outer circumferential surface and the inner circumferential surface. The chamber and backpressure chamber have substantially the same pressure.

Separation membrane module

A magnetism detection device includes: a transmission line set having a transmission line including a linear first conductor including a magnetic material; and a detector that: inputs, from a first end of the transmission line set, a pulse signal as a first incident wave and detects, at the first end, a first reflected wave of the first incident wave; inputs, from a second end opposite to the first end, a pulse signal as a second incident wave and detects, at the second end, a second reflected wave of the second incident wave; and detects a strength of a magnetic field applied to the transmission line set based on compositing of the first reflected wave and the second reflected wave.

Magnetism detection device and magnetism detection method

A separation membrane module that is provided enables a bending load that is applied to a support member that supports ends of tubular separation membranes to be decreased and enables a seal member between the outer circumferential surface of the support member and the inner circumferential surface of a housing to be omitted. The separation membrane module includes a tubular housing, tubular separation membranesthat are arranged in a longitudinal direction of the housing, end tubesthat are connected to the lower ends of the tubular separation membranes, a support boxthat supports the end tubes, and a backpressure chamberbelow the support box. The tubular separation membranesare in communication with a collection chamberof the support box. A permeated fluid is extracted via a nozzlethat is disposed on the support box. A chamberand the backpressure chamberare in communication with each other via a gap between the outer circumferential surface of the support boxand the inner circumferential surface of the housing. Pressure in the chamberand pressure in the chamberare substantially the same.

An object of the present invention is to provide a separation membrane module in which an end member is prevented from coming out even at the occurrence of a reverse pressure or the like. The invention relates to a separation membrane module which is equipped with a cylinder-shaped housing and a tubular separation membrane and which takes out a fluid which has permeated the tubular separation membrane. An end pipe is connected to one end portion of the tubular separation membrane; the end pipe is supported by a support plate which is disposed so as to traverse the housing; and an end plug is connected to the other end portion of the tubular separation membrane. The separation membrane module is further equipped with a coming-out preventive member.

Separation membrane module and repairing method thereof

To provide a process for producing BPDA whereby high productivity is attained while high purity is maintained. A process for producing biphenyltetracarboxylic acid dianhydride, which comprises heating biphenyltetracarboxylic acid to produce biphenyltetracarboxylic acid dianhydride, characterized in that the heating is carried out at a pressure of from 1&#xd7;10Pa to 1.1&#xd7;10Pa to a maximum temperature in a range of from 210&#xb0; C. to 250&#xb0; C. in such a manner that the temperature rising rate is higher than 50&#xb0; C./hr for a period of at least &#xbc; of the time for the temperature rise from 60&#xb0; C. to 210&#xb0; C., and the temperature is maintained to be from 150&#xb0; C. to 250&#xb0; C. for from 0.5 to 10 hours.

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Tokyo, Japan

Naoki Noguchi