Other

Hitachi Denshi Kabushiki Kaisha

Hitachi, Ltd.

The Furukawa Electric Co., Ltd.

The Tokyo Electric Power Company, Incorporated

Yoshihiro Iwata

Hideo Ishii

Shoichi Honjo

Kazuya Ohmatsu

Jun Fujikami

Masahiro Sugimoto

Nobuhiro Saga

Masahiro Koya

Mitsuo Shiraishi

Shuji Hahakura

Masanao Mimura

Akio Kimura

An oxide superconducting stranded wire having inter-strand insulation and high critical current is provided. A wire including an oxide superconducting material and a matrix covering the material and consisting essentially of silver or a silver alloy is coated with a paint containing, as a main component, an organometallic polymer such as a silicone polymer or aluminum primary phosphorus in a paint reservoir, and the paint is baked in a baking furnace via a drying furnace. A plurality of such wires with the baked paint are twined into a stranded wire, which is then heated up to a temperature necessary for sintering the oxide superconducting material. The stranded wire thus obtained through the step of sintering may have high critical current. A heat-resisting insulating coating layer may be formed by baking the paint.

Methods of manufacturing oxide superconducting stranded wire and oxide superconducting cable conductor, and coated wire, stranded wire and cable conductor

Disclosed is an AC oxide superconductor round wire including a metal matrix, and a plurality of superconductor filaments embedded in the metal matrix, wherein the superconductor filaments are twisted at a twist pitch L.sub.p satisfying the following relation.

AC oxide superconductor wire and cable

A method of treating oil sludge and an apparatus for carrying out same, whereby oil of good quality and inorganic harmless slag can be easily obtained. The method includes agitating oil sludge in an electrolytic tank so as to liquefy same, extracting waste fluid from the liquefied oil sludge, separating solid material from the liquefied oil sludge with a centrifugal separator, extracting waste fluid including the solid material, transporting the liquefied oil sludge to a precipitation tank, extracting waste fluid which is separated and precipitated in the precipitation tank, applying low frequency oscillation to the oil sludge in fluid supply tubes between the electrolytic tank, centrifugal separator and precipitation tank so as to increase oxygen content, extracting oil from an upper portion of the precipitation tank, and incinerating the extracted waste fluid. The apparatus includes an agitator disposed inside an electrolytic tank, a first fluid supply tube connecting the electrolytic tank and a centrifugal separator, a second fluid supply tube connecting the centrifugal separator and a precipitation tank, an oil supply tube connecting the precipitation tank and the oil tank, coils disposed on the first and second fluid supply tubes for applying a low frequency/low voltage/low current signal, and extracting tubes respectively connected between the electrolytic tank, the centrifugal separator and the precipitation tank for extracting waste fluid.

Method of treating oil sludge

A method of and apparatus for manufacturing hydrous oil are provided low frequency and low voltage and current signals are applied to a water supply pipe system and a low frequency and low voltage and current signal is applied to an oil supply system. The water and oil mix with each other at a mixing point and a plurality of low frequency and low voltage and current signals are applied to a mixing supply system formed by joining the water supply pipe system and oil pipe system. The mixture of water and oil is subjected to emulsification in a heater-equipped emulsion tank and the emulsification is facilitated with the aid of air so as to produce the hydrous oil. After a low frequency and low voltage and current signal is applied to the hydrous oil, air is supplied to the hydrous oil in an aeration tank. Further, after a low frequency and low voltage current signal is applied to the hydrous oil, the hydrous oil is flowed in a storage tank.

Apparatus for manufacturing hydrous oil

A method of and apparatus for manufacturing hydrous oil are provided. A plurality of frequency and low voltage and current. A plurality of low frequency and low voltage and current signals are applied to a water supply pipe system and a low frequency and low voltage current signal is applied to an oil supply system. The water and oil mix with each other at a mixing point and a plurality of low frequency and low voltage current signals are applied to a mixing supply system formed by joining the water supply pipe system and oil pipe system. The mixture of water and oil is subjected to emulsification in a heater-equipped emulsion tank and the emulsification is facilitated with the aid of air so as to produce the hydrous oil. After a low frequency and low voltage and current signal is applied to the hydrous oil, air is supplied to the hydrous oil in an aeration tank. Further, after a low frequency and low voltage and current signal is applied to the hydrous oil, the hydrous oil is flowed into a storage tank.

Method of manufacturing hydrous oil

A squelch circuit for a radio transmitter/receiver includes an amplifier, a digitally-controlled electronic volume control, a volume adjusting variable resistor, and a volume controller. The amplifier amplifies a received audio signal input and provides the received audio signal to a loudspeaker. The digitally-controlled electronic volume control changes the output level of the amplifier. The volume adjusting variable resistor outputs data representing a volume value. The volume controller constantly detects changes in volume value data output from the variable resistor, and controls an attenuation amount of the digitally-controlled electronic volume control in accordance with the volume value represented by the variable resistor. While in a 'mute' state, this volume control continues until a predetermined time has elapsed since the detection of the change in volume value data. The volume controller then sets the attenuation amount of the digitally-controlled electronic volume control to an infinite attenuation amount.

Squelch circuit for volume control of a radio transmitter and receiver

In an adaptive digital filter having a digital filter for simulating a transmission system having indeterminate transmission characteristics through a series circuit of a plurality of series-connected delay circuits, and a correction circuit for correcting the output signal from the digital filter in accordance with changes in transmission characteristics of the transmission system, an input signal to and an output signal from the series circuit of the delay circuits are squared. The difference between the square signals is divided by the number of the delay circuits to obtain a mean value. When the mean value exceeds a predetermined value, the operation of the correction circuit is inhibited.

Adaptive digital filter

An adaptive digital filter is connected in parallel with a transmission system and includes a plurality of delay circuits, a nonrecursive digital filter having coefficient parameters of the delay circuits so as to approximate the characteristics of the transmission system, and a correction circuit for correcting the coefficient parameters of the nonrecursive digital filter. The adaptive digital filter further includes a first variable attenuator, a second variable attenuator and a comparator. The first variable attenuator receives an input signal for the adaptive digital filter, variably attenuates the input signal in response to a first control signal, and supplies an attenuated input signal to the transmission system and the nonrecursive digital filter. The second variable attenuator receives a difference between the output signals from the nonrecursive digital filter and the transmission system and variably attenuates the difference signal in response to a second control signal. The attenuated difference signal serves as an output of the adaptive digital filter. The comparator compares the level of the input signal with the level of the output signal from the transmission system and drives the first or second attenuator, which receives a lower level signal when the level difference exceeds a predetermined value.

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Tokyo, Japan

Yoshihiro Iwata