Fujitsu Corporation

Toyota Jidosha Kabushiki Kaisha

Earthrecycle Co., Ltd.

Kenichi Hamada

Masakazu Taguchi

Akira Nanba

Satoshi Furuta

Shigenori Yanagi

Toru Ikeda

Hiroyuki Imanishi

Shigeki Hasegawa

Nobuyuki Kitamura

Toru Fujiwara

Shigeyoshi Tanaka

Kouta Manabe

Katsuhiko Fukuda

Masaki Ando

Takashi Tachibana

Tatsuya Yumioka

Toshiharu Kaizawa

Takeshi Uesaka

Eiji Kaneko

A method for separating cellulose from a wood-based raw material including hemicellulose, cellulose, and lignin as principal components, includes injecting the wood-based raw material into a dissolution reservoir in which ethylene glycol is stored as a separating agent, and heating the separating agent in the dissolution reservoir at atmospheric pressure to a temperature in a range of 260&#xb0; C. to 280&#xb0; C., and reacting the wood-based raw material with the separating agent, evaporating a hemicellulose component from the separating agent and condensing the hemicellulose component, and monitoring a pH value of the condensate of the hemicellulose component. A temperature of the condensate is held at the temperature at which a change in the pH value of the condensate decreases, lignin is dissolved in the separating agent, and crude cellulose that floats in the separating agent is separated and collected.

Method for separating cellulose

A fuel cell system operates under at least one of the conditions of no humidity or high temperature, and an operating method thereof, are characterized in that a fuel cell has a fuel gas flow path and an oxidant gas flow path arranged such that fuel gas and oxidant gas flow in opposite directions, a determining apparatus that determines the amount of water near the oxidant gas flow path inlet, and a fuel gas control apparatus which increases the amount of water near the oxidant gas flow path inlet by increasing the fuel gas flowrate and/or reducing the fuel gas pressure if it is determined in the determining apparatus that the amount of water near the oxidant gas flow path inlet is insufficient.

Fuel cell system and operating method of a fuel cell

In order to assure drive of a drive motor, a boost operation of a boost device is appropriately performed by judging whether a voltage supplied from a fuel cell suffices a voltage required for driving the drive motor, thereby suppressing a switching loss by the boost device. A fuel cell system is a power source for driving a load. The system includes: a drive motor driven by an electric power; a fuel cell which generates electricity by an electrochemical reaction between an oxidizing gas containing oxygen and a fuel gas containing hydrogen and supplies an electric power to the drive motor; a first boost device which can boosts the voltage outputted from the fuel cell and supplies the boosted voltage to the drive motor; and boost control means which controls voltage boost performed by the first boost device according to the relationship between the fuel cell output voltage and the voltage required by the drive motor.

Fuel cell system

A fuel cell system () includes: a circulation pump () provided on a fuel gas circulation channel () so as to circulate a fuel gas; a pump temperature detection portion () that detects a temperature of the circulation pump (); a warmup portion that warms up the circulation pump; a pump control portion () that drives the circulation pump; and a breakdown determination portion () that determines whether the circulation pump has broken. At the start of the fuel cell system, if the pump temperature detected by the pump temperature detection portion () is below the melting point of water, the warmup portion warms the circulation pump, and the pump control portion () drives the circulation pump (). If the pump temperature is higher than or equal to the melting point of water and the rotation speed of the circulation pump () is less than a predetermined speed, the breakdown determination portion () determines that the circulation pump () has broken.

Fuel cell system and operation method for fuel cell system

A data recording method for calculating a digital sum value (DSV) corresponding to a proportion of positive data and negative data included in predetermined data ranges, selecting a resync pattern to be inserted between the data ranges according to the DSV, and inserting the selected resync pattern between the data ranges, has a step of selecting a resync pattern that minimizes differences in DSV between the data ranges.

Data recording method, data reproduction method, data recording device, data reproduction device and optical recording medium

A clock adjustment apparatus for adjusting a phase of a clock signal based on a phase error thereof is provided in a data reproduction system which samples a readout signal from a recording medium in synchronism with the clock signal, and reproduces data in accordance with a Viterbi algorithm by using sampled values of the readout signal. The recording medium is recorded with the data modulated in accordance with a recording rule of a predetermined partial response characteristic. The clock adjustment apparatus includes a phase error calculation circuit which calculates the phase error of the clock signal based on the sampled values of the readout signal.

Apparatus for adjusting phase of clock signal based on phase error calculated from sampled values of readout signal

Data recording method and apparatus for reducing fluctuation in DC component

In a data reproducing apparatus, a monitor edge sample value is generated based on a second sample value at a trailing edge of the reproduction signal and a change amount of the monitor edge sample value is generated as an offset amount in a first processing part. Then, the offset amount is supplied to a second processing part where the second sample value is obtained by sampling the reproduction signal at the trailing edge. Then, the second processing part restores data based on the reproduction signal and the offset amount.

Clock adjusting device for use with data reproducing apparatus, offset detecting device, and data reproducing apparatus

A data reproduction apparatus that employs an expected value generation unit that employs a maximum likelihood decoding algorithm, thereby an expected value is correctly determined from a histogram of sampled values of a signal to be reproduced, even when an offset arises in the signal to be reproduced, the offset being removed from the sampled values used in generating a histogram that is used to determine the expected value.

Expected value generation unit and a data reproduction apparatus

A clock adjustment device for a data reproduction apparatus includes an edge detection part detecting an edge of a reproduced signal corresponding to a predetermined synchronization pattern based on a state of change of sampled values obtained in synchronism with a clock signal from the reproduced signal, a timing signal output part outputting a timing signal in a given cycle determined by the synchronization pattern from a timing at which the edge of the reproduced signal is detected, and a phase adjustment part adjusting a phase of the clock signal when the edge of the reproduced signal is detected and every time the timing signal is output.

Phase detection using sampled data

A data reproduction device includes an A/D converter quantizing a reproduction signal read from data recorded on a recording medium to produce quantized data based on a sampling clock; a reproduction signal determination unit determining rising and falling parts of the reproduction signal based on the quantized data, and outputting a gate signal corresponding to a result of determining the rising and falling parts; a leading-edge clock generation unit generating a leading-edge clock signal synchronous to a leading edge indicating a rising part of the reproduction signal; a trailing-edge clock generation unit generating a trailing-edge clock signal synchronous to a trailing edge indicating a falling part of the reproduction signal; a signal switch unit generating the sampling clock by selecting one of the leading-edge clock signal and the trailing-edge clock signal based on a value of the gate signal; and a signal supply unit supplying the sampling clock to the A/D converter, wherein the data reproduction device reproduces the data recorded on the recording medium by executing digital signal processing on the quantized data. The data reproduction device can share a single A/D converter and a single decoder used for reproducing recorded data based on clocks synchronous to a leading edge and a trailing edge of the recording pit. As a result, a circuit structure of the data reproduction device is simplified, thereby achieving decreases in a size of an implementation area and in the number of implemented parts in the circuit structure of the data reproduction device.

Data reproduction device with simplified circuit structure

A data reproduction device reproduces the data recorded on the recording medium by executing digital signal processing on the quantized data. The data reproduction device can share a single A/D converter and a single decoder used for reproducing recorded data based on clocks synchronous to a leading edge and a trailing edge of the recording pit.

A clock matching apparatus for a data reproduction system includes a phase error detection unit which detects a phase error of a clock signal based on samples of a readout signal output by a sampler of the data reconstruction system. A phase-locked loop supplies a phase-matched clock signal to the sampler by compensating for the phase error detected by the phase error detection unit. The phase error detection unit includes an edge detection unit which detects a sampling instant for an edge sample among the samples of the readout signal. A difference unit generates a difference in timing phase between the edge sample and a sync level, the sync level being a reference signal level corresponding to a level of the readout signal at the sampling instants thereof and defined based on a partial-response waveform, the difference in the timing phase being output to the phase-locked loop as the detected phase error.

Clock matching apparatus for a data reproduction system

There is provided an optical storage device that can position a lens carriage and objective lens even when position sensors for the lens carriage and objective lens are excluded in an effort to make an optical disk unit thinner. In the optical storage device, immediately after an optical disk is loaded in a main body, the cutoff frequency of a filter lying on a path of a reproduction signal is temporarily changed to a lower frequency. A spacing of sectors of the optical disk is detected using a signal sent from the filter. A type of an optical storage medium and a position of a current reproduction track are detected on the basis of the detected sector spacing and data stored in a memory.

Optical storage device made thinner by substituting electrical means for

A pseudo-LSI device for emulating a single electronic circuit using a plurality of programmable logic elements mounted on a common circuit board, providing a pseudo-operation unit comprising a plurality of programmable gate arrays constituting a pseudo-LSI when having circuit data written thereto, a nonvolatile memory unit for storing the circuit data to be downloaded from outside, a transfer unit for transferring the circuit data stored in the nonvolatile memory unit to the pseudo-operation unit, and a power supply unit, said four units being provided in the form of an assembly, which can be used in developing LSIs and to debugging systems.

Growing community of inventors

Kato, Japan

Kenichi Hamada