著者

中島 洋

出版者

CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN

雑誌

低温工学 (ISSN:03892441)

巻号頁・発行日

vol.37, no.4, pp.148-156, 2002-04-25 (Released:2010-02-26)

参考文献数

11

---

The development of a superconducting Maglev system in Japan was started more than 30 years ago. Since 1997, the running tests have been successfully continued on the Yamanashi test line. A manned run in 1999 attained a speed of 552km/h, The Yamanashi test results proved a remarkable stability of the onboard superconducting magnet system, In these 30 years, we have encountered many difficult problems during this development. In this paper, the history of the Maglev development will be introduced with focus on these problems, especially in regard to the superconducting magnets and onboard refrigerators.

著者

Fumio SAWA Manwal HUSSAIN Atsushi NAKAHIRA Shigehiro NISHIJIMA Koichi NIIHARA Toichi OKADA

出版者

CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN

雑誌

TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan) (ISSN:03892441)

巻号頁・発行日

vol.30, no.9, pp.415-419, 1995-09-25 (Released:2010-02-26)

参考文献数

9

被引用文献数

1

---

Hybrid materials involving epoxies with different numbers of reactive groups have been prepared to determine the molecular design of epoxies with high fracture toughness at cryogenic temperatures. To answer the opponent demands, that is, strong and flexible chains, hybrid materials were proposed. Two types of epoxy resin with different numbers of epoxy groups were mixed and cured by changing the mixing ratio. Fracture toughness, flexural strength, dielectric loss tangent, and thermal contraction of the hybrid epoxy resins were measured down to cryogenic temperatures. A hybrid material with high fracture toughness, even at liquid helium temperature, was successfully developed and hence the molecular design orientation was confirmed to be possible.

著者

Izumi FUSEGAWA Tomohiko OHTA Shigeru NAGASAWA

出版者

CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN

雑誌

TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan) (ISSN:03892441)

巻号頁・発行日

vol.33, no.2, pp.54-59, 1998-02-25 (Released:2010-02-26)

参考文献数

23

被引用文献数

1

---

Most of the large-scale integrated circuits (LSIs), indispensable at present day, are made from Si wafers grown by Czochralski (CZ) method. The size of LSIs continues to grow with the integration of more devices. The diameter of Si crystal has also been increasing to enable the production of large-size LSIs with practical productivity and cost. Generally, a large-diameter crucible is used to produce large single-crystal silicon with practical productivity. However, it is becoming difficult to control the convection of large amounts of silicon melt in large crucibles using the conventional CZ method. Magnetic field-applied CZ (MCZ) is one solution to control the convection of Si melt. There are several kinds of MCZ categorized by magnetic-field direction: horizontal (HMCZ), vertical (VMCZ), Cusp MCZ; and several types of magnets categorized by the magnetic-field generation method (electroconductive and superconductive). In this paper, out-lines of CZ production for single-crystal silicon, MCZ equipment and MCZ production are reviewed.

著者

永井 啓一

出版者

CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN

雑誌

低温工学 (ISSN:03892441)

巻号頁・発行日

vol.22, no.5, pp.298-307, 1987-10-25 (Released:2010-02-26)

参考文献数

4

---

The development program of the H-II Rocket has been initiated in 1985, and now engineering model test is being progressed. The H-II Rocket is a new expendable launch vehicle to meet a demand of space activities in the 1990's, with capability of placing a 2 ton class satellite into geostationary earth orbit (GEO). After trade-off studies, LOX/LH2 propulsion system with a single main engine (LE-7) of staged combustion cycle has been selected for the 1st stage of the H-II Rocket, considering its high performance and the accumulated experience in cryogenic propulsion system technology through development of the 2nd stage (LOX/LH2) of the H-I Rocket, of which the first test flight was successfully launched in August, 1986. And the 2nd stage propulsion system will be developed by upgrading modification (tank volume increase and engine thrust up) of the H-I Rocket 2nd stage. This paper shows an outline of the propulsion systems of H-II Rocket 1st and 2nd stages, and the technical problem including the technics which was gained in the development of H-I 2nd stage propulsion system.

著者

富岡 章 能瀬 眞一 八木 裕治郎

出版者

CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN

雑誌

低温工学 (ISSN:03892441)

巻号頁・発行日

vol.41, no.1, pp.28-35, 2006

---

We have developed the production technology for HTS magnets used in power transformers. Two subjects were mainly studied (i.e., high-voltage technologies and large current and low AC loss technologies) to establish the production method for a 66 kV / 6.9 kV 10 MVA-class HTS power transformer. In order to verify the validity of the elemental technologies, a single-phase 66 kV / 6.9 kV 2 MVA-class model HTS transformer was manufactured and tested. The test results indicate that the elemental technologies established can be used for the development of a 66 kV / 6.9 kV 10 MVA-class HTS power transformer.

著者

石原 昭

出版者

CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN

雑誌

低温工学 (ISSN:03892441)

巻号頁・発行日

vol.8, no.4, pp.162-166, 1973-09-25 (Released:2010-02-26)

参考文献数

19

---

A survey of researches on persistent current switches for superconducting magnets is presented.Basic principles and methods of persistent current switches are given. General characteristics and some problems of thermal type and mechanical type persistent current switches are described including off-state resistance, on-state resistance, stability of switch-superconductor, responce time and consumption of liquid He. Some examples of these switches are given.

著者

藤巻 朗

出版者

CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN

雑誌

低温工学 (ISSN:03892441)

巻号頁・発行日

vol.31, no.11, pp.572-577, 1996-11-25 (Released:2010-02-26)

参考文献数

30

---

An overview of present Josephson junctions based on high-temperature superconductors (HTSs) is described. I indicate the importance of the critical current-normal resistance (IcRn) product, and show the experimentally-obtained values of the IcRn products for the HTS Josephson junctions reported so far. The junctions include grain boundary junctions, edge junctions, and sandwich junctions. Considering the charge transport mechanism across the junctions, effective ways to increase the IcRn product are proposed.

著者

井上 廉

出版者

CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN

雑誌

低温工学 (ISSN:03892441)

巻号頁・発行日

vol.30, no.8, pp.369-376, 1995-08-25 (Released:2010-02-26)

参考文献数

12

---

The hybrid magnet, which is a large system composed of an inner water-cooled magnet and an outer superconducting magnet, is well known to be the most suitable for generating steady high-magnetic fields. Thirty T-class hybrid magnets are being operated at several high-magnetic field laboratories, The world's highest steady field at present is 35.2T. Projects to enhance the steady fields up to 40-45T are progressing now at the National Research Institute for Metal, Japan, and the National High Magnetic Field Laboratory, USA. In particular, the NRIM project is just now nearing the final stage. In this article, I review in detail the hybrid magnet technology including those of superconducting magnet and water-cooled magnet, the present status of hybrid magnet systems in operation, and the developing projects at NRIM.

著者

岩本 雅民

出版者

CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN

雑誌

低温工学 (ISSN:03892441)

巻号頁・発行日

vol.34, no.9, pp.438-446, 1999-09-25 (Released:2010-02-26)

参考文献数

45

---

This paper discusses biomagnetic effects and their possible applications that are unfamiliar to cryogenic and superconducting engineers. Biomagnetism is exotic applied magnetics and a transdisciplinary research target. There are two types of research methodology, physical and epidemiological. They are quite different. Both methodologies should be harmonized. The author proposes how to work in this transdisciplinary field. Finally, suggestions of guidelines for studing exotic phenomena are presented.

著者

村上 正秀

出版者

CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN

雑誌

低温工学 (ISSN:03892441)

巻号頁・発行日

vol.17, no.2, pp.65-75, 1982-04-25 (Released:2010-02-26)

参考文献数

28

---

Considerable astronomical interest has been directed towards the infrared observations in space using cooled telescopes. The design needs the use of advanced technology in many areas, especially in cryogenic.Observations in the infrared from the space environment are free from the absorption and emission by the earth's atmosphere. Telescopes and detectors cooled to a temperature near to absolute zero improve the sensitivity tremendously, because of reduction of the background noise.The use of liquid helium is essential to achieving such temperature level. Superfluid helium may be the best coolant for this purpose, owing to its excellent heat transport capability. On the other hand, several potential difficulties have been pointed out with respect to the containment of superfluid helium in tanks on board. One of such difficulties was the phase separation between vapor and liquid under zero-gravity condition. Now, it seems that this is solved by the use of the porous plug or the active phase separator.More than five space infrared missions have been planned to be launchned in the 80's. Some are presently in preparation and others are under consideration. These missions are expected to reveal stellar and planetary formation in clouds of gas and dust. The dust radiates primarily in the infrared and obscures shorter wavelengths such as the visible radiation. The Galaxy and several external galaxies are important objects which can be well studied in the infrared.We are also proposing an infrared telescope on board a Spacelab (IRTS). Relating fundamental studies and preliminary design consideration are under way.These all missions are ambitious projects and give a challenge to cryogenic physicists and engineers.

著者

橋本 巍洲

出版者

CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN

雑誌

低温工学 (ISSN:03892441)

巻号頁・発行日

vol.16, no.3, pp.118-130, 1981-07-05 (Released:2010-02-26)

参考文献数

15

---

Recently, in order to actualize the magnetic refrigerator in the high temperature region from 4K to room temperature, several investigators in Japan and USA have studied the problem of the magnetic refrigerants, the refrigeration cycles and the new type of magnetic refrigerators. In this review successive to the previous one by Ohtsuka the current works of those are introduced.This paper consists of the following four parts:1) First, in order to make clear the direction of the investigation for the magnetic refrigerator, operations and physical charactor of the magnetic refrigerator by Brown are discussed precisely and it is pointed out that investigations on the magnetic refrigerant, heat exchange between the regenerator and refrigerant, and the thermal analysis of the fundamental magnetic refrigeration cycle are important.2) Next, current investigations on two types of magnetic refrigerants, which have the large applied magnetic field dependence of the magnetic entropy change caused by its considerable increase of internal field near Tc and the rotation of the large magnetic anisotropic substance in the magnetic field, are cited and the origin of these phenomena is explained physically.3) Then, we describe the investigations of heat exchange between the magnetic substance and heat transfer gas and of the thermal analysis of the refrigeration cycle.4) Last, for examples of new types of magnetic refrigerators, rotational-cooling magnetic refrigerator by Barclay and regenerative magnetic expander (RME) by Barclay and Steyert are introduced.

著者

米満 博夫

出版者

CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN

雑誌

低温工学 (ISSN:03892441)

巻号頁・発行日

vol.4, no.6, pp.247-264, 1969-12-25 (Released:2010-02-26)

参考文献数

15

被引用文献数

1 1

---

This paper reviews supercritical helium gas cooling methods. The thermal transport properties of supercritical helium near 4.2°K are collected.Cryogenic helium pump or bellow pump for forced supercritical circulation is adequate to the laboratory-scale cooling system.The superconducting composite configurations with hollow conductors are used for supercritical channel forced cooling.

出版者

CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN

雑誌

低温工学 (ISSN:03892441)

巻号頁・発行日

vol.16, no.5, pp.259-262, 1981-11-15 (Released:2010-02-26)

著者

松本 尚徳

出版者

CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN

雑誌

低温工学 (ISSN:03892441)

巻号頁・発行日

vol.19, no.1, pp.35-42, 1984-03-10 (Released:2010-02-26)

参考文献数

8

---

Cold Air Products Company, Ltd. (CAP) was established in May, 1975, in order to produce Liquid Oxygen, Liquid Nitrogen and Liquid Argon utilizing the cold of LNG (-160°C) imported by Osaka Gas Company.The utilization of LNG cold reduces greatly the electric power comsumption as compared with conventional processes. This feature will contribute to the savings in energy and natural resources which is a world wide requirement.In this report, the utilization of LNG cold for air separation plants is described.

著者

遠藤 忠 小柳 正男

出版者

CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN

雑誌

低温工学 (ISSN:03892441)

巻号頁・発行日

vol.15, no.1, pp.12-21, 1980-02-25 (Released:2010-02-26)

参考文献数

35

---

The national voltage standard has recently been maintained by using the Josephson effect in more than ten countries. The voltage standard had been maintained by the standard cell for a long time. The stability of the voltage standard has been improved by the introduction of the Josephson voltage standard. The Josephson voltage standard is based on the constancy and universality of the fundamental physical constant 2e/h. The adopted value of 2e/h in ETL is 483 594GHz/V. The accuracy of the Josephson voltage standard is 10-7 to 10-8 in the practical use. The further improvement of the accuracy would be expected. The commercial Josephson voltage standard system will be widely used in near future.In this article, the above profile of the Josephson voltage standard is described.

著者

北村 泰一

出版者

CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN

雑誌

低温工学 (ISSN:03892441)

巻号頁・発行日

vol.15, no.1, pp.38-47, 1980-02-25 (Released:2010-02-26)

参考文献数

5

---

Some technical problems are described concerning the field measurements of the geomagnetic field by using SQUID magnetometer.In the natural circumstances, the atmospheric temperature change, wind, rain and even the thunder activities bring several disturbances into the measurements of the geomagnetic field using SQUID. Among them, some of the troubles are attributed to the lower slew rate of the SQUID electronic circuits compared to that of the phenomena. Others come from the temperature effect of, also, the circuits, in particular, from the amplitude change of the RF oscillator due to the temperature change.Several examples observed at Mt. ASO (lower magnetic noise site) are shown. A comparison of small geomagnetic changes at Mt. ASO with that at Syowa base, Antarctica, is made, and the coincidental events are found between the two sites separated more than 10, 000km.

著者

井上 廉 坂井 義和 浅野 稔久 前田 弘

出版者

CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN

雑誌

低温工学 (ISSN:03892441)

巻号頁・発行日

vol.30, no.4, pp.163-170, 1995-04-25 (Released:2010-02-26)

参考文献数

14

被引用文献数

2 2

---

Recently, we successfully developed a new Cu-Ag microcomposite alloy with a promising combination of high mechanical strength and high electrical conductivity. When a Cu-16 at% Ag alloy ingot was cold-worked into a wire or a sheet with several times of intermediate annealing at 350-450°C, it shows high conductivity of 75-83% IACS and a high tensile strength of 0.7-1.1GPa at room temperature. These values are superior to those of Cu-Nb microcomposite alloy. The Cu-Ag microcomposite alloy shows excellent mechanical strength with cold work of over 93% areal reduction ratio, while a very heavy cold work of more than 99.97% areal reduction ratio is necessary for realizing such mechanical strength in the Cu-Nb microcomposite. A further advantage of the Cu-Ag microcomposite is easy casting of the alloy ingot, resulting in excellent homogeneity of the microstructure and, therefore, the properties in the alloy wire and sheet. We wound the Cu-Ag microcomposite alloy wire into several pulsed magnets. One of them generated non-destructively 73.4T with duration time of 5msec in a 10mm bore. An other one generated non-destructively 65.3T with duration time of 100msec in a 16mm bore. The feasibility study of the Cu-Ag microcomposite alloy sheet as Bitter magnet sheets is progressing now in collaboration with the Francis Bitter National Magnet Laboratory and the National High Magnetic Field Laboratory. A steady field of 35.2T could be generated by inserting the Cu-Ag microcomposite alloy Bitter sheets into the highest-field region in Hybrid III of FBNML. These pulsed fields and the steady one are world records as of this writing.

著者

大塚 泰一郎

出版者

CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN

雑誌

低温工学 (ISSN:03892441)

巻号頁・発行日

vol.34, no.8, pp.385-394, 1999-08-25 (Released:2010-02-26)

参考文献数

3

---

The reversibility of the magnetic behaviour of superconductors assured by the Meissner effect allows the application of thermodynamics to analyse the macroscopic properties of superconductors. In this second lecture, the fundamentals of electromagnetism and thermodynamics will be reviewed and applied to the analysis of superconductive phenomenon.

著者

緒形 俊夫 石川 圭介

出版者

CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN

雑誌

低温工学 (ISSN:03892441)

巻号頁・発行日

vol.21, no.2, pp.99-103, 1986-04-25 (Released:2010-02-26)

参考文献数

9

被引用文献数

1 1

---

Measurements were made on the temperature rise of tensile test specimens of austenitic stainless steels undergoing plastic deformation and discontinuous flow in normal liquid helium and superfluid helium. As the strain rate increased, the ultimate tensile strength and elongation decreased and the temperature rise increased. Compared with the results in normal liquid helium, the frequency of stress drop increased and the temperature rise was suppressed in superfluid helium.

著者

大塚 泰一郎

出版者

CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN

雑誌

低温工学 (ISSN:03892441)

巻号頁・発行日

vol.34, no.4, pp.134-143, 1999-04-25 (Released:2010-02-26)

---

The understanding of superconductivity has progressed in four stages. During the first period following the discovery of disappearance of electrical resistivity of mercury by Kamerlingh Onnes, attempts were made to understand superconductivity based only on zero resistance. The second period was initiated by the discovery of the Meissner effect. Based on new knowledge of the magnetic property of zero resistivity, phenomological theories were developed and new aspects of superconductivity were uncovered, culminating in the establishment of the BCS theory. The rediscovery of a second type of superconductivity together with flux quantization initiated the third period where fluxons play an active role. The fourth period, which is still in progress, was initiated by the discovery of oxides with dramatically high critical temperatures. All these activities were initiated by Kamerlingh Onnes' brilliant insight leading to the discovery of superconductivity.