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Teion kogaku = Cryogenic engineering : [official journal of the Cryogenic Association of Japan]最新文献

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Characteristics of Bi-2223 Thick Films on an MgO Substrate Prepared by a Coating Method. 涂覆法制备MgO基板上Bi-2223厚膜的特性
Teion kogaku = Cryogenic engineering : [official journal of the Cryogenic Association of Japan] Pub Date : 2002-09-25 DOI: 10.2221/JCSJ.37.479
M. Ichikawa, H. Kado, M. Shibuya, M. Kojima, M. Kawahara, T. Matsumura
{"title":"Characteristics of Bi-2223 Thick Films on an MgO Substrate Prepared by a Coating Method.","authors":"M. Ichikawa, H. Kado, M. Shibuya, M. Kojima, M. Kawahara, T. Matsumura","doi":"10.2221/JCSJ.37.479","DOIUrl":"https://doi.org/10.2221/JCSJ.37.479","url":null,"abstract":"","PeriodicalId":93144,"journal":{"name":"Teion kogaku = Cryogenic engineering : [official journal of the Cryogenic Association of Japan]","volume":"37 1","pages":"479-484"},"PeriodicalIF":0.0,"publicationDate":"2002-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68187703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Boiling Heat Transfer Characteristics of Subcooled Nitrogen 过冷态氮的沸腾传热特性
Teion kogaku = Cryogenic engineering : [official journal of the Cryogenic Association of Japan] Pub Date : 2002-09-25 DOI: 10.2221/JCSJ.37.485
H. Kubota, Y. Takata, Takehiro Ito, M. Iwakuma, K. Funaki
{"title":"Boiling Heat Transfer Characteristics of Subcooled Nitrogen","authors":"H. Kubota, Y. Takata, Takehiro Ito, M. Iwakuma, K. Funaki","doi":"10.2221/JCSJ.37.485","DOIUrl":"https://doi.org/10.2221/JCSJ.37.485","url":null,"abstract":"The boiling heat transfer characteristics of saturated and subcooled nitrogen were investigated to clarify the effect of subcooling. The objective of this study is to supply information on the cooling design of high-Tc superconducting apparatuses such as the high-Tc super-conducting transformer. A thin wire of platinum-30% rodium with a diameter of 0.05mm was simultaneously used for the heater and the thermometer. The effect of space restrictions around wire on heat transfer characteristics was also examined by using transparent acrylic tubes covering thin wires, which simulated the complicated structure of a cooling system for high-Tc superconducting apparatuses. The heat transfer characteristics of subcooled nitrogen were compared with those of saturated nitrogen, and it was found that heat transfer was remarkably enhanced with the degree of subcooling.","PeriodicalId":93144,"journal":{"name":"Teion kogaku = Cryogenic engineering : [official journal of the Cryogenic Association of Japan]","volume":"37 1","pages":"485-491"},"PeriodicalIF":0.0,"publicationDate":"2002-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68187774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Results from the Danish High Temperature Superconducting Power Cable Project 丹麦高温超导电力电缆工程成果
Teion kogaku = Cryogenic engineering : [official journal of the Cryogenic Association of Japan] Pub Date : 2002-09-25 DOI: 10.2221/JCSJ.37.450
J. Østergaard, O. Tønnesen
{"title":"Results from the Danish High Temperature Superconducting Power Cable Project","authors":"J. Østergaard, O. Tønnesen","doi":"10.2221/JCSJ.37.450","DOIUrl":"https://doi.org/10.2221/JCSJ.37.450","url":null,"abstract":"For the first time, a high temperature superconducting (HTS) demonstration cable system has been installed in a utility network supplying electricity to consumers. The cable is a 30-m long, 30kVrms, 2, 000Arms cable, installed in the network of Copenhagen Energy at a substation supplying approximately 50, 000 customers. The purpose of the cable installation is to obtain installation and operating experience with this type of cable. The cable system has been in operation since May 28th 2001, and the first operating experiences of the cable have been satisfactory. The cable has been in operation for more than one year, and the cable has during the first year supplied 101, 000MWh of energy to the customers.","PeriodicalId":93144,"journal":{"name":"Teion kogaku = Cryogenic engineering : [official journal of the Cryogenic Association of Japan]","volume":"37 1","pages":"450-456"},"PeriodicalIF":0.0,"publicationDate":"2002-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68187596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Development of MgB2 New Superconducting Tapes and Wires MgB2新型超导带和导线的研制
Teion kogaku = Cryogenic engineering : [official journal of the Cryogenic Association of Japan] Pub Date : 2002-09-25 DOI: 10.2221/JCSJ.37.457
H. Kumakura, A. Matsumoto, H. Kitaguchi, M. Okada
{"title":"Development of MgB2 New Superconducting Tapes and Wires","authors":"H. Kumakura, A. Matsumoto, H. Kitaguchi, M. Okada","doi":"10.2221/JCSJ.37.457","DOIUrl":"https://doi.org/10.2221/JCSJ.37.457","url":null,"abstract":"We fabricated MgB2 tapes and wires by a powder-in-tube (PIT) method, using MgB2 powder and several sheath materials such as Cu, Cu-Ni, Ni, pure Fe, carbon steel (Fe-C), and stainless steel. Jc of the as-cold rolled (un-sintered) tape significantly increased with the increase of total cross-sectional area reduction by the cold working. Hard sheath materials such as Fe-C and stainless steel are effective to enhance the packing density of MgB2 core and, therefore, to increase Jc values. Non heat treated MgB2 tapes with Fe-C and stainless steel sheaths showed extrapolated Jc values of-3.0-4.5×109A/m2 at 4.2K and zero field. Heat treatment after the cold rolling is effective to enhance Jc values. An order of magnitude higher Jc values were obtained for Fe, Fe-C, and stainless steel sheathed tapes after the heat treatment. Extrapolated Jc values well above 1010A/m2 at 4.2K and a zero magnetic field were obtained for stainless steel and Fe-C sheathed MgB2 tapes. Jc values of PIT-processed MgB2 tapes are less sensitive to strain than those of PIT-processed Bi-based oxide tapes. It is reported that the addition of soft metal powder such as In or Sn to the MgB2 powder is effective to enhance Jc values. We made -10m-long tapes with Ni sheaths, and fabricated small solenoid coil with this tape without sintering. The Ic of the coil was about 80% of the Ic of the short tape, indicating that the homogeneity of Ic in the 10m tape is fairly good. The coil generated 1.3kGauss at 4.2K.","PeriodicalId":93144,"journal":{"name":"Teion kogaku = Cryogenic engineering : [official journal of the Cryogenic Association of Japan]","volume":"63 1","pages":"457-464"},"PeriodicalIF":0.0,"publicationDate":"2002-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68187607","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Reduction of the Heat Leak in Superconducting System at Half-wave-rectified Current Mode by Peltier Current Lead 用珀尔帖引线减少超导系统半波整流电流模式下的热泄漏
Teion kogaku = Cryogenic engineering : [official journal of the Cryogenic Association of Japan] Pub Date : 2002-09-25 DOI: 10.2221/JCSJ.37.472
Takayuki Yamaguchi, Naohiro Ohtaki, Y. Hasegawa, Keiji Nakamura, S. Yamaguchi
{"title":"Reduction of the Heat Leak in Superconducting System at Half-wave-rectified Current Mode by Peltier Current Lead","authors":"Takayuki Yamaguchi, Naohiro Ohtaki, Y. Hasegawa, Keiji Nakamura, S. Yamaguchi","doi":"10.2221/JCSJ.37.472","DOIUrl":"https://doi.org/10.2221/JCSJ.37.472","url":null,"abstract":"Experiments of Peltier current lead (PCL) were performed by the way of half-wave-rectified current (HWRC) for an evaluation of the PCL system in the drive with the large-rippled current. The current ripple of the HWRC is large, and we discussed the cooling capability of the current ripple. The experimental results revealed that the temperature difference of the thermoelectric-element (TE) increased with the magnitude of the current in the PCL system, despite the large current ripple. Calorimetric measurements revealed that the PCL reduced the heat leak of 60% for the peak current 90A. We compared the PCL systems of the direct current (dc) mode and the HWRC mode. The results showed that the current dependence of the temperature difference in the HWRC mode did not match that of the dc mode, but those of the heat leak matched well. The performance of the Peltier cooling in the HWRC mode is reduced to be 2/πtime of the Seebeck coefficient for the dc mode by using the time-average method.","PeriodicalId":93144,"journal":{"name":"Teion kogaku = Cryogenic engineering : [official journal of the Cryogenic Association of Japan]","volume":"37 1","pages":"472-478"},"PeriodicalIF":0.0,"publicationDate":"2002-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68187692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Standardization of Test Methods for Superconductivity 超导性试验方法标准化
Teion kogaku = Cryogenic engineering : [official journal of the Cryogenic Association of Japan] Pub Date : 2002-08-25 DOI: 10.2221/JCSJ.37.369
K. Osamura
{"title":"Standardization of Test Methods for Superconductivity","authors":"K. Osamura","doi":"10.2221/JCSJ.37.369","DOIUrl":"https://doi.org/10.2221/JCSJ.37.369","url":null,"abstract":"","PeriodicalId":93144,"journal":{"name":"Teion kogaku = Cryogenic engineering : [official journal of the Cryogenic Association of Japan]","volume":"37 1","pages":"369-369"},"PeriodicalIF":0.0,"publicationDate":"2002-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68187661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
DC Critical Current Measurement of Nb3Sn Composite Superconductors Nb3Sn复合超导体直流临界电流测量
Teion kogaku = Cryogenic engineering : [official journal of the Cryogenic Association of Japan] Pub Date : 2002-08-25 DOI: 10.2221/JCSJ.37.376
Yasuzo Tanaka
{"title":"DC Critical Current Measurement of Nb3Sn Composite Superconductors","authors":"Yasuzo Tanaka","doi":"10.2221/JCSJ.37.376","DOIUrl":"https://doi.org/10.2221/JCSJ.37.376","url":null,"abstract":"","PeriodicalId":93144,"journal":{"name":"Teion kogaku = Cryogenic engineering : [official journal of the Cryogenic Association of Japan]","volume":"37 1","pages":"376-378"},"PeriodicalIF":0.0,"publicationDate":"2002-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68187671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Recent Progress of Magnetic Refrigerant Materials at High Temperatures 高温磁性制冷剂材料研究进展
Teion kogaku = Cryogenic engineering : [official journal of the Cryogenic Association of Japan] Pub Date : 2002-08-25 DOI: 10.2221/JCSJ.37.397
H. Wada
{"title":"Recent Progress of Magnetic Refrigerant Materials at High Temperatures","authors":"H. Wada","doi":"10.2221/JCSJ.37.397","DOIUrl":"https://doi.org/10.2221/JCSJ.37.397","url":null,"abstract":"Recently, much attention has been given to magnetic refrigeration, because of its energy efficiency and environmental safety. The concept of magnetic refrigeration is based on the magnetocaloric effect (MCE); therefore the development of magnetic materials with a large MCE is strongly desired. In this article we first review the recent development of magnetic refrigerator at temperatures of 20-300K. We then report on the recent progress of magnetic materials with a large MCE. The giant MCE was observed in Er (Co1-xNix)2, MnAs1-xSbx and Mn3GaC in temperature ranges of below 30K, above 220K and at around 160K, respectively. The origin of the giant MCE in these compounds is the first-order magnetic transition (FOMT). The advantage of utilizing the FOMT system as a magnetic refrigerant material is also described.","PeriodicalId":93144,"journal":{"name":"Teion kogaku = Cryogenic engineering : [official journal of the Cryogenic Association of Japan]","volume":"37 1","pages":"397-403"},"PeriodicalIF":0.0,"publicationDate":"2002-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68187476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
DC Critical Current Measurement of Ag Sheathed Bi-2212 and Bi-2223 Oxide Superconductors 银包覆Bi-2212和Bi-2223氧化物超导体的直流临界电流测量
Teion kogaku = Cryogenic engineering : [official journal of the Cryogenic Association of Japan] Pub Date : 2002-08-25 DOI: 10.2221/JCSJ.37.379
K. Itoh
{"title":"DC Critical Current Measurement of Ag Sheathed Bi-2212 and Bi-2223 Oxide Superconductors","authors":"K. Itoh","doi":"10.2221/JCSJ.37.379","DOIUrl":"https://doi.org/10.2221/JCSJ.37.379","url":null,"abstract":"","PeriodicalId":93144,"journal":{"name":"Teion kogaku = Cryogenic engineering : [official journal of the Cryogenic Association of Japan]","volume":"37 1","pages":"379-381"},"PeriodicalIF":0.0,"publicationDate":"2002-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68187681","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Surface Resistance Measurements of Superconductors at Microwave Frequencies 超导体在微波频率下的表面电阻测量
Teion kogaku = Cryogenic engineering : [official journal of the Cryogenic Association of Japan] Pub Date : 2002-08-25 DOI: 10.2221/JCSJ.37.391
S. Kosaka
{"title":"Surface Resistance Measurements of Superconductors at Microwave Frequencies","authors":"S. Kosaka","doi":"10.2221/JCSJ.37.391","DOIUrl":"https://doi.org/10.2221/JCSJ.37.391","url":null,"abstract":"","PeriodicalId":93144,"journal":{"name":"Teion kogaku = Cryogenic engineering : [official journal of the Cryogenic Association of Japan]","volume":"85 1","pages":"391-393"},"PeriodicalIF":0.0,"publicationDate":"2002-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68187461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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