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Volume 6 (1971)
- Issue 6 Pages 233-
- Issue 5 Pages 175-
- Issue 4 Pages 129-
- Issue 3 Pages 85-
- Issue 2 Pages 37-
- Issue 1 Pages 1-
Volume 6, Issue 5
Displaying 1-6 of 6 articles from this issue
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Kozo FUSHIMI1971 Volume 6 Issue 5 Pages 175-181
Published: December 20, 1971
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSIt is estimated in Japan that the demand for electric energy will reach the amount of 3.8×1011kWh and 80% of the quantity will be produced from the fossil and nuclear fuel in 1975. Moreover, numer ous consumers of electricity will converge on a narrow district so-called Tokaido megalopolis in days.
Many problems includig political and economical matter must be solved to provide for the above future situation.
In the technological field, the following thema of research and development are proposed.
(1) Utilization of heat rejected from the thermal electric power plants.
(2) Reduction of waste matter from the thermal plants.
(3) High efficiency, new energy conversion devices.
(4) Large capacity under ground transmission line.
(5) Offshore and undersea power station.
(6) Measure to counter the peak power demand.
(7) Revolutional power distribution system suitable for the over-crowded city.View full abstractDownload PDF (855K) -
K. KASAMATSU, K. MAJIMA, J. MORIYA, K. MAEDA, H. KIHARA1971 Volume 6 Issue 5 Pages 182-189
Published: December 20, 1971
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSThis paper deals with the considerations and an experiment concerning the reliability of the cryogenic refrigerator.
On the basis of extensive investigation it is pointed out that one of the most important factors which affect the reliability of a conventional cryogenic refrigerator is the expansion engine.
After making a fundamental study on expansion engines, on was designed for reliability testing, with NTBF (Mean Time Between Failures) aimed at 8, 000 hours aud the non-maintenance period at 4, 000 hours.
The trial expansion engine which incorporates an auto-valve was incorporated into a Compact-sized helium liquefying refrigerator for cooling a large-sized super-conducting magnet which generates a persistent magnetic field of 55kilo gauss. The refrigerator was operated for a total of 2, 500 hours including a 1, 000-hour continuous unattended operation, without trouble. Thus, the non-maintenance period was estimated at 5, 000 hours.View full abstractDownload PDF (967K) -
Akihiko ISAO, Teruo NOGUCHI, Yoshiaki UCHIDA, Akira KONO1971 Volume 6 Issue 5 Pages 190-207
Published: December 20, 1971
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSSupercondcting intermetallic compounds, Nb3Al and Nb3(Al-Ge) were prepared by three methods: diffusion after dipping, diffusion after vacuum deposition and co-deposition. It is found that the intermetalic compounds can be formed at temperarures between 800°C and 1, 000°C by the co-deposition method. Intermetalic compohnds formed were identified using X-ray diffraction analysis, observation of anodically oxidized specimens and meaurement of the superconducting transition temperature.
The critical current densities, Jc were measured for Nb3(Al-Ge) specimens prepared by codeposition method with a result Jc-104A/cm2 at 30KG. Refering to the literatures on Nb3Al, Nb3(Al-Ge), Nb3Sn, V3Si and V3Ga inter relations between the method of synthesis, the formation temperature and the superconducting properties were examined to find the way to raise the critical current density of Nb3Al and Nb3(Al-Ge).View full abstractDownload PDF (2242K) -
Keichi OSHIMA, Yoshihiro ISHIZAKI, Ryo KURODA1971 Volume 6 Issue 5 Pages 208-213
Published: December 20, 1971
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSIt is a well-known fast that in refrigerators using helium gas as working substance, arbitrary temperatures, from room temperature to liquid helium temperature can be produced. Various kinds of refrigerators having cooling capacity and characteristics extend from laboratory use to industrial scale, have been commercialized. In evaluating the performance of these refr- igerators, items such as weight, volume, power requirements per unit cooling capacity reliability and time of continuous operation can be considered, however, very few reports have been made on this matter.
Such evaluations have become increasingly important for refrigerators of industrial uses.
In relation with the seseareh of refrigeration systems for high-speed transportation, a study has been made of relations between refrigeration temperatures and power requirements for unit cooling capacity at 4.5, 20, 78K for published and commercial refrigerators.View full abstractDownload PDF (699K) -
Yoji KUBOTA, Motoyoshi ISHIZUKA1971 Volume 6 Issue 5 Pages 214-218
Published: December 20, 1971
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSDielectric constant measured from 0.025K to 300K is reported on capacitance thermometers on SrTiO3 crystallized from glass at 1, 100°C and 1, 203°C.View full abstractDownload PDF (605K) -
T. KITAGAKI1971 Volume 6 Issue 5 Pages 219-222
Published: December 20, 1971
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSDownload PDF (2227K)
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