All issues
Successor
Volume 47, Issue 9
Displaying 1-7 of 7 articles from this issue
- |<
- <
- 1
- >
- >|
-
[in Japanese]1968 Volume 47 Issue 9 Pages 667
Published: September 20, 1968
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (1829K) -
Masasi Miyadi1968 Volume 47 Issue 9 Pages 668-677
Published: September 20, 1968
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSSince the first artificial satellite was launched by U. S. S. R. in October, 1957, a great emphasis has been placed on the space research activities throughout the world.
In Japan, the Institute of Space and Aeronautical Science, University of Tokyo and Science and Technology Agency are playing a most active part in the space research activities.
The author describes the history and background of the space research and development in the past decade, and discusses some problems at which Japan is facing to further promote her space activities.View full abstractDownload PDF (1610K) -
Masuo Uehara, Mitihiro Otsuki1968 Volume 47 Issue 9 Pages 678-688
Published: September 20, 1968
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSIn the Middle East which ranks first both in the reserves and pro-duction of crude oil, Abu Dhabi, one of the the Indian states, along with the Trucial Coast of the Persian Gulf, has recently been come to our expectation as the production of low sulfur- and light- crudes. Although Abu Dhabi is a broiling and barren land, it possesses Murban, Um Shaif and Zakum oil fields and it is regarded as a second Kuwait in the near future.
Our country embarked on the development of the marine areas of Abu Dhabi in December, 1967, and our Company has aquired the oil concession and set about the seismic prospecting since May, 1968. Mitsubishi Mining Co. and others has also aquired the concession of land. Thus, Abu Dhabi has been spotlighted as the future sources of oil supply to Japan.View full abstractDownload PDF (1464K) -
Kiyoshige Shiozawa, Lan Tu Lin1968 Volume 47 Issue 9 Pages 689-694
Published: September 20, 1968
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe character of fuel gas is considered as same as the general gas, but in practice, the variation of the calorific value measured is unexpectedly large. It is the purpose of this study to know the effects of any of the following problems.
(a) The degree of influence from the state that the sample is collected from the population (manufacturing process).
(b) The method of treatment to the sample gas.
(c) The variation of calorific value from generating by temperative difference on sampling method.
This study is to try to investigation in sampling method that the variation makes a minimum value by mathematical and statistical and statistical research on all of the above problems. In conclusion, the following results have been obtained by this study.
(1) If the variation of error of the manufacturing process and sampling is large, method (c) will be able to plan on uniformity by pooling.
(2) The results of separating δ2S and al with control chart show that δ2S of method (c) is the minimum.View full abstractDownload PDF (604K) -
Minoru Shiraishi, Hideo Kimura, Junjiro Kumai, Yuji Yoshida1968 Volume 47 Issue 9 Pages 695-701
Published: September 20, 1968
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe variation of the Knoop hardness number (Hk) in a temperature range of 20°C to 350°C was investigated for eight kinds of coal of different ranks.
The Hk of brown coals (Tempoku and Taiheiyo) increased remarkably with the increase of tempearature. The Hk determined at a room temperature after the heating at 350°C was higher than that before the heating. The increase of Hk with temperature is considered to be mainly due to the intrinsic changes (the evolution of moisture and the increment of crosslinkages) in brown coals.
The Hk of anthracite (Omine) began to increase slightly above about 200°C. This would be due to the increase in the elastic recovery, because the Hk at a room temperature after heating at 350°C was identical to that before the heating.
The Hk of bituminous coals (Miike, Yubari, Hashima and Itmann), on the other hand, decreased with the temperature. The temperature change of Yubari coal and Hashima coal was reversible. For Miike coal, the Hk obtained at a room temperature after the heating at 350°C was slightly lower than that before the heating, but for Itmann coal it was slightly higher. It is interpreted that the decrease of Hk is due to the increase of free volume, the effect of bitumen as plasticizer and the decomposition of coal.
The Hk of durite was lower than the value of vitrite except Itmann coal. In case of bituminous coals, both the Hk of durite and vitrite decreased with the increase of temperature. The former depended more apparetly on temperature than the latter.View full abstractDownload PDF (984K) -
Electron Spin Resonance Study of Solvent Action at High Temperature of CoalChikao Yokokawa1968 Volume 47 Issue 9 Pages 702-710
Published: September 20, 1968
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSSeventeen kinds of vitrains in different ranks were heated at 140°C for three hours in ethylene diamine, in pyridine and in cyclohexanone and the variation of ESR absorption spectra were examined. Spin concentration for individual coals de-creased considerably excepting the case of a brown coal, and the degree of the variation seemed to be closely connected with the rank of coals in the same way as that observed after immersing in solvents at room temperature (cf. This Journal 46, 903 (1967)). A part of the decrease in spin concentration was irreversible and still remained after wash-ing the treated coal with methanol and dilute hydrochloric acid, on the contrary of the fact that the variations caused by solvents at room temperature were almost entirely reversed by the washing. It is considered that the reversible decrease is due to the spin-spin interaction and that the irreversible decrease takes place as a result of the spin-spin coupling. Such a mechanism for the irreversible decrease as that a part of spin centres abstracts hydrogen atom from the solvent molecules and the. solvent radicals thus formed recombine with each other, seems to be ruled out because the irreversible decrease caused by the different solvents shows no noticeable difference, even though the radical trapping effect of these solvents is considered to be different considerably.
It was suggested by an experimental result that the narrow component of the com-posite signals observed previously originates from the fusite immingled with the vitrains.View full abstractDownload PDF (1143K) -
1968 Volume 47 Issue 9 Pages 716-720
Published: September 20, 1968
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (686K)
- |<
- <
- 1
- >
- >|