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Volume 48, Issue 2
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[in Japanese]1969 Volume 48 Issue 2 Pages 75
Published: February 20, 1969
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (300K) -
Kenichi Yamamoto1969 Volume 48 Issue 2 Pages 76-85
Published: February 20, 1969
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSEight years have gone by since the success of the proto-type NSU-Wankel rotary piston engine was announced. Today, a total of 18 organizations, includ-ing NSU and Wankel, are continuing efforts for the practical use of the Wankel engine in their respective fields, and commercialization and volume-production are progressing at an extremely quick tempo.
Developments of the Wankel engine have been remarkably progressed especially in the fields of portable engines for various uses, or automobile engines in which the merits of the Wankel engine are effective.
Future developments of the Wankel engine are worthy of attention.View full abstractDownload PDF (2734K) -
Seiichi Nomura1969 Volume 48 Issue 2 Pages 86-96
Published: February 20, 1969
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESS(1) The author summarized the opinions appeared in the articles and author's experimental data, regarding existent state of caking constituent in coal, microscopic observation of oxidized coal, hardness, viscosity, x-ray diffraction, caking property of oxidized coal, change of caking constituent by oxidation, caking mechanism of oxidized coal, change of caking property in different temperature of oxidation, application of oxidation in the manufacture of coke ball in rotary retort and relation between active radicals containing oxygen in coal and caking property, and introduced his opinions on this subject.
(2) There was transition point in the oxidation temperature of coal and this point was explained by the relation between oxidation velocity and diffusion velocity of oxygen into the inner part of coal particle.
(3) Application of oxidation reaction to coal, especially to coal in plastic state in the manufacture of coke ball was described.
(4) The relation between caking property of woody part of lignite which was rich in active radicals containing oxygen and caking property of oxidized coal was stated.
Coke button number of woody part in lignite was increased by washing in dilute acid solution and was decreased by washing in dilute salt solution. Substantial difference of caking property between woody part in lignite and bituminous coal was guessed.View full abstractDownload PDF (2805K) -
Evaporation Velocity of Motor Gasoline and Light Diesel OilChikashi Chiba1969 Volume 48 Issue 2 Pages 97-102
Published: February 20, 1969
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe author has elucidated the follwing relations at steady state from the experiments, in which fuel oil contained in crucible was rapidly put into a constant temperature furnace of natural draught.
(1) The evaportaion ν of a pure liquid (water) is constant.
(2) ν of a motor gasoline is constant at the initial term, then becomes smaller gradually.
(3) The author derived the rate of linear evaporation for a light diesel oil and obtained the empirical equation of evaporation velocity coefficient k at the initial term.
(4) As for the motor gasoline and the light diesel oil, the rate of evaporation per unit area is proportional to the logarithm of time of evaporation after the initial term of stationary state. The proportional constant k' is the coefficient of eva-poration velocity. k' is constant with the same furnace temperature without regard to the initial weights of oil.View full abstractDownload PDF (783K) -
Reactivity of Coke from Unblended Coal, Green Oil Coke, or PitchTaizo Kashino, Akira Wasa, Touru Yokoyama, Minoru Matsui1969 Volume 48 Issue 2 Pages 103-112
Published: February 20, 1969
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSA test method for reactivity of fine coke was devised, of which apparatus was operated semi automatically, and by which difference between many sorts of cokes was given official approval reasonably and precisely.
Reactivity of cokes from unblended coal, green oil coke or pitch were measured by the method and next results have been obtained.
(1) Rising carbonization temperature, reactivity of coke from coal becomes lower, but from green oil coke has a tendency to become higher.
(2) Cokes from coals with about 30% volatile matter have generally low reactivity. And among coals with equal volatile matter, coke from coal with lower fluidity and dilation tend to has higher reactivity.
(3) Among cokes produced from coals at same carbonization temperature, reactivity of coke becomes higher increasing internal surface area of the coke.View full abstractDownload PDF (1249K) -
Potentiometric Titration of Regenerated Humic Acids in Dimethyl SulfoxideSeiji Arita, Kaoru Masumura, Yoshihiro Kogushi, Kenjiro Takeshita1969 Volume 48 Issue 2 Pages 113-118
Published: February 20, 1969
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSIt has been believed that regenerated humic acids have carboxylic and phenolic hydroxy groups.
In the present paper, the experimental results to establish the best method for the quantitative determination of these acid groups were reported. The results obtained were the following:
(1) The potentiometric titration in nonaqueous solvents could be successfully applied to the determination of the carboxylic and phenolic hydroxy groups in the regenerated humic acids.
(2) Two kinds of the solvent, dimethylformamide and dimethylsulfoxide, were used, and it was found that dimethylsulfoxide was superior to dimethylformamide in respect of the dissolving ability of these solvents to the humic acids.
(3) As the titrants, the following standard solutions were used:
1) N/10-Benzene-methanol solution of lithium methoxide.
2) N/10-Benzene-methanol solution of sodium methoxide.
3) N/10-Benzene-methanol solution of potassium methoxide.
4) N/10-Dimethylformamide solution of sodium amino-ethoxide.
5) N/10-Dimethylsulfoxide solution of sodium amino-ethoxide.
6) N/10-Ethylenediamine solution of sodium amino-ethoxide.
7) N/10-Benzene-methanol solution of n-butyl-triethylammonium hydroxide.
In these titrants, lithium methoxide was the best reagent which gave the least neutrarization equivalent of the humic acids.View full abstractDownload PDF (821K) -
1969 Volume 48 Issue 2 Pages 123-127
Published: February 20, 1969
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (700K)
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