Abstract: An absorption refrigerator includes a high temperature regenerator for heating a water solution including a halogen compound to generate steam. An oxide film having thickness of 0.02-5.0 &mgr;m, one of the colors blue, purple and gray, or a hydroxyl group is formed on a surface of at least one of the high temperature regenerators and the heat exchanger.

Abstract: A pickling plant for a steel strip and a method for controlling the pickling plant, including monitoring at least one quantity of state represented by thickness, width and quantity of scale of the steel strip, and at least one quantity of state of operation of a plant represented by concentration, quantity and temperature of acid supplied into a pickling tank of the pickling plant, line speed of the steel strip, and temperature of the steel strip immediately before entering the pickling tank calculating on the basis of values of said quantity of state and quantity of state of operation, at least one of concentration distribution of acid, concentration distribution of iron and descaling rate at optional plural positions, and on the basis of the calculating the optimum quantity of state for operation of the plant is determined.

Abstract: An absorption refrigerator uses water as a refrigerant and a halogen compound as an absorption solution, and is characterized in that an oxide film of thickness of 0.02-5.0 .mu.m is formed on a surface of at least one of a heat exchanger and a high temperature regenerator. And a production method of the absorption refrigerator is characterized by oxidizing a surface of at least one of a heat exchanger and a high temperature regenerator at a temperature of 200-800.degree. C., and adjusting a heating temperature and a heating retaining time so that a value of parameter (P), obtained according to P=T (5+log t) is 3.5-6.0.times.10.sup.3, wherein T represents heating temperature (.degree.K), and t heating retaining time (minute).

Abstract: An absorption refrigerator uses water as a refrigerant and a halogen compound as an absorption solution, and is characterized in that an oxide film of thickness of 0.02-5.0 .mu.m is formed on a surface of at least one of a heat exchanger and a high temperature regenerator. And a production method of the absorption refrigerator is characterized by oxidizing a surface of at least one of a heat exchanger and a high temperature regenerator at a temperature of 200.degree.-800.degree. C., and adjusting a heating temperature and a heating retaining time so that a value of parameter(P), obtained according to P=T (5+log t) is 3.5-6.0.times.10.sup.3, wherein T represents heating temperature (.degree.K), and t heating retaining time (minute).

Abstract: A corrosion degree measuring method capable of field measurement for intergranular corrosion, particularly the sensitization degree, of the plant's structural materials in a narrow space. The metal electrode made of a material being measured and the counter electrode to the metal electrode are immersed in an electrolytic solution. A voltage is applied to the metal electrode in the anodic direction so as to raise the potential of the metal electrode up to the passive state potential and to keep the metal electrode at the passive state potential. The passive state potential is used as a reference potential, and a pulse-like potential signal is applied to the metal electrode in the cathodic direction. At the time of the application of the pulse potential signal, a current between the metal electrode and the counter electrode is measured, and the corrosion degree of the material being measured is determined from the intensity of the current.

Abstract: This invention provides a method and an apparatus for removing scales from hot-rolled steel strips to produce steel strips with excellent surface conditions. In a pickling facility to pickle the hot-rolled steel strip, the pickling method of this invention passes an electric current through the continuously fed, hot-rolled steel strip in one or more of a plurality of pickling tanks. A means to supply an electric current is also provided.

Abstract: A plant operational status monitoring supervisory system comprising; means for extracting information directly relating to water quality of an objective portion consecutively for a period of time by means of an electrochemical water quality sensor installed in an objective portion to monitor in-situ in a plant; means for evaluating water quality based on thus extracted information; means for comparing an obtained water quality evaluation result with a reference value for a predetermined plant operation procedure; and means for displaying or storing necessary portion out of said comparison results; is disclosed.

Abstract: This invention comprises electrochemical analytical devices capable of performing electrolysis in multiple pulse modes. It relates to a method of quantitative analysis and equipment for performing quantitative analysis which uses a combination of these pulse modes to realize the measurement of concentrations of multiple substances to be measured, occurring in the test solution to be measured and also a nuclear reactor water quality control system employing such a quantitative analysis method.

Abstract: This invention comprises electrochemical analytical devices capable of performing electrolysis in multiple pulse modes. It relates to a method of quantitative analysis and equipment for performing quantitative analysis which uses a combinaiton of these pulse modes to realize the measurement of concentrations of multiple substances to be measured, occurring in the test solution to be measured and also a nuclear reactor water quality control system employing such a quantitative analysis method.

Abstract: A printed wiring board comprising a plastic material is formed with a through opening for mounting electronic parts therein, and the end of the opening on the rear side of the board is closed by a metal sheet bonded to the area around the opening end on the rear of the board through an adhesive layer. The inside wall and bottom face of the opening in the board are coated with an integral plating film as are the rear surfaces of the board an metal sheet. According to this board structure, the heat generated from electronic parts mounted on the bottom of the opening is dispersed by the metal sheet, and also penetration of moisture into the opening through the plastic material and the adhesive layer, as occurs with conventional boards, is prevented by the plating film.

Abstract: A printed wiring board comprising a plastic material is formed with a through opening for mounting electronic parts therein, and the end of the opening on the rear side of the board is closed by a metal sheet bonded to the area around the opening end on the rear of the board through an adhesive layer. The inside wall and bottom face of the opening in the board are coated with an integral plating film as are the rear surfaces of the board and metal sheet. According to this board structure, the heat generated from electronic parts mounted on the bottom of the opening is dispersed by the metal sheet, and also penetration of moisture into the opening through the plastic material and the adhesive layer, as occurs with conventional boards, is prevented by the plating film.