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Volume 31, Issue 12
Displaying 1-14 of 14 articles from this issue
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[in Japanese]1952 Volume 31 Issue 12 Pages 549
Published: December 31, 1952
Released on J-STAGE: June 28, 2010
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Some Studies in the Field of Coal. Preparation Technology on Local Characteristics in Yubari Seam(I)Takeshi Takakuwa, Ryazo Oyama1952 Volume 31 Issue 12 Pages 550-553
Published: December 31, 1952
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe authors have carried out the sizing analysis and the float-sink analysis of coal samples from two Ten Feet Seams at Y and O positions in Yubari mine.The.calorific values and the ash contents are also shown for the fractions of float-sink analysis.
It is recognized that there exists no remarked difference in the characteristics between Y and O series.The fractions lighter than 1.3 of the specific gravity, the principal part of the samples, show slight difference in the characteristics between the series.For other fractions, however, O series have higher calories and lower ash content.
Some microscopic examinations are described for the fractions in.comparison with the characteristics mentioned above.View full abstractDownload PDF (601K) -
Toshio Sakurai, Masanori Ishizaki, Tetsuro Baba1952 Volume 31 Issue 12 Pages 554-558
Published: December 31, 1952
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSWhen the steel surfaces wetted with water are lubricated by satur-ated fatty acid, it has been found that the water molecules on the steel surfaces are displaced gradually by fatty acid molecules as number of measurements or mec-hanical agitation increases.This phenomenon is likely to be related to the rust preventive action of oils.
The frictional behaviors of, saturated fatty acids are invesigated from room temp-erature to higher temperatures, and the transition temperature is obtained.The hysteresis found in the measurements of the coefficient of kinematic friction is considered to be due to that the reorientation of fatty acid molecules are disturbed by the thermal and mechanical agitation.Furthermore, static frictional behavior of fatty acid series is about the same as observed in kinematic conditions.View full abstractDownload PDF (777K) -
Ikutaro Sawai, Masanaga Kunugi1952 Volume 31 Issue 12 Pages 558-562
Published: December 31, 1952
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSFor studying the gas flow pattern in the glass tank furnace, small-scale model experiments have been carried out.Dilute solution of hydrochloric acid and caustic soda were used to represent the streams of air and producer gas, respectiv-ely.The conditions of the experiments were adjusted so that the Reynold and Froude numbers for the flow in the model assume comparable with those in the actual hot furnace system.The solution of caustic soda was coloured by phenolpht-halein in order to measure the length of model flame.The results obtained are as follows:
(1) The path of flame in combustion chamber is greatly influenced by the inc-lination of the ceiling of port measred at the opening.
(2) The concentration of alkali analysed at the several points on the opening revealed that the reaction has already completed by 70∼80 percent within the port.
(3) The width of flame is about 2.4 times as wide as the width of port opening.View full abstractDownload PDF (584K) -
1952 Volume 31 Issue 12 Pages 563-568
Published: December 31, 1952
Released on J-STAGE: June 28, 2010
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1952 Volume 31 Issue 12 Pages 568-573
Published: December 31, 1952
Released on J-STAGE: June 28, 2010
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[in Japanese]1952 Volume 31 Issue 12 Pages 574-587
Published: December 31, 1952
Released on J-STAGE: June 28, 2010
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[in Japanese]1952 Volume 31 Issue 12 Pages 588-591
Published: December 31, 1952
Released on J-STAGE: June 28, 2010
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1952 Volume 31 Issue 12 Pages 592
Published: December 31, 1952
Released on J-STAGE: June 28, 2010
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1952 Volume 31 Issue 12 Pages 592a-593
Published: December 31, 1952
Released on J-STAGE: June 28, 2010
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1952 Volume 31 Issue 12 Pages 593-594
Published: December 31, 1952
Released on J-STAGE: June 28, 2010
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1952 Volume 31 Issue 12 Pages 595-596
Published: December 31, 1952
Released on J-STAGE: June 28, 2010
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1952 Volume 31 Issue 12 Pages 597-599
Published: December 31, 1952
Released on J-STAGE: June 28, 2010
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1952 Volume 31 Issue 12 Pages 599-600
Published: December 31, 1952
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (351K)
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