Hitachi, Ltd.

Kenji Yokose

Tetsuya Matsui

Takehiko Kitamori

Masaharu Sakagami

Masataka Koga

Yoshitaka Nishino

Tsuyoshi Nishitarumizu

Takashi Nakao

Makoto Nagase

Shigeru Izumi

Michihiko Aizawa

Shunsuke Uchida

Yamato Asakura

Toshio Sawa

Hiroshi Kamimura

Hidefumi Ibe

Haruo Fujimori

Taiko Ajiro

An absorption refrigerator is characterized by an absorber which has a tube bank of heat-conductive tubes in the absorber, a vapor flow passage between the tube bank and a side wall of the absorber which is opposite to and separated from the tube bank in a radial direction of the heat-conductive tubes by a distance equal to or larger than a maximum pitch of the heat-conductive tubes, at least a baffle plate disposed in the vapor flow passage, and a gas extraction port disposed outside the tube bank. A further arrangement is characterized by an absorber having a tube bank in the absorber, a vapor flow passage between the tube bank and a side wall of the absorber, and a gas extraction port disposed around a central portion of the tube bank.

Absorption refrigerator

This invention concerns a plant diagnosis apparatus which comprises a first detecting unit for detecting a state of devices constituting a circulating system in which a fluid circulates and a second detecting unit for detecting a quality of the above-mentioned circulating fluid or a quality of the atmosphere surrounding the above-mentioned circulating system, and a unit for diagnosing the circulating system by output of the first and second detecting units, and therefore can diagnose anomaly of facilities such as a nuclear power plant with high reliability and rapidity.

Plant diagnosis apparatus and method

An apparatus and a method for analysis of a particle by irradiation of the particle in a fluid with an intense laser pulse to cause laser breakdown and to detect sonic waves or plasma emission which are generated by the laser breakdown. The size of the particle is measured by using at least two kinds of information from the following: intensity of plasma emission or sonic wave generated by the laser breakdown, location of the laser breakdown plasma, and plasma emission waveform. Also, a laser pulse having flattened distribution of intensity for the irradiation is used in order to eliminate the dependence of the measured value on the particle location.

Apparatus for analysis of particulate material, analytical method for

This invention relates to an analytical method and a relevant equipment for particulate substances in a sample with the detection of acoustic waves generated in the sample with the irradiation of onto the sample. In this invention, the light power density of the irradiating light onto the sample is set high enough above the breakdown threshold of the particulate substances in the sample, and low enough below the breakdown threshold of the media, and the particulate substances in the sample are counted by detecting the acoustic waves generated by the breakdown of the particulate substances. The particulate substances are also analyzed for their components on the basis of the light signal (emission spectrum) which is detected with a dispersed spectrum from the light which is generated by the breakdown of the particulate substances.

Analytical method for particulate substances, relevant analytical

The power density of a pulsed laser beam for irradiating a sample is adjusted to break down the sample into the form of a plasma. After the momentary breakdown of the sample into the form of a plasma, ions are generated having a high charge. Then, after a certain time elapses, the ions having a high charge recombine with the electrons in the plasma to provide monovalent or low valent ions. These low valent ions are taken out of the plasma and introduced to a mass spectrometric apparatus.

Method and apparatus for mass spectrometric analysis

A method of and an apparatus for analyzing a granular material contained in a sample of a medium such as water produced by an ultra-pure water producing apparatus includes the steps of adding energy to granular materials contained in a sample which is mixed with the medium, wherein the energy is set to be lower than the breakdown threshold of the medium and to be higher than the breakdown threshold of the granular materials, detecting ions which are generated with the breakdown of the granular materials by using a pair of positive and negative electrodes; and analyzing characteristics of the granular materials based on the ions.

Method of and apparatus for analyzing granular materials

Apparatus for measuring breakdown plasma, comprising an irradiating device for irradiating a sample with a focused light beam and for causing breakdown of a ultrafine particle to be measured in the sample at the focused beam region to change the particle into plasma; a pair of electrodes arranged on opposite sides of the focused region of the beam; and a device for measuring an electrical resistance between the electrodes under a condition where the breakdown plasma is produced between the electrodes and for determining a diameter of the particle according to the measured electrical resistance serves for accurate measurement of the diameter of the ultrafine particle in the sample.

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Hitachi, Japan

Kenji Yokose