Pub Date : 2017-09-01DOI: 10.9714/PSAC.2017.19.3.044
Seunghak Han, S. Nam, Jeyull Lee, Seunghyun Song, Haeryong Jeon, Geonwoo Baek, Hyoungku Kang, T. Ko
{"title":"A comparison on the heat load of HTS current leads with respect to uniform and non-uniform cross-sectional areas","authors":"Seunghak Han, S. Nam, Jeyull Lee, Seunghyun Song, Haeryong Jeon, Geonwoo Baek, Hyoungku Kang, T. Ko","doi":"10.9714/PSAC.2017.19.3.044","DOIUrl":"https://doi.org/10.9714/PSAC.2017.19.3.044","url":null,"abstract":"","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"19 1","pages":"44-48"},"PeriodicalIF":0.3,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47731325","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}
Pub Date : 2017-06-01DOI: 10.9714/PSAC.2017.19.2.038
Chang Ju Hyeon, Ji Hyung Kim, Huu Luong Quach, S. Chae, Y. Yoon, Jeyull Lee, Seunghak Han, Haeryong Jeon, Y. H. Choi, Haigun Lee, Ho Min Kim
{"title":"Conceptual design of cooling anchor for current lead on HTS field coils","authors":"Chang Ju Hyeon, Ji Hyung Kim, Huu Luong Quach, S. Chae, Y. Yoon, Jeyull Lee, Seunghak Han, Haeryong Jeon, Y. H. Choi, Haigun Lee, Ho Min Kim","doi":"10.9714/PSAC.2017.19.2.038","DOIUrl":"https://doi.org/10.9714/PSAC.2017.19.2.038","url":null,"abstract":"","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"19 1","pages":"38-43"},"PeriodicalIF":0.3,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44124936","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}
Pub Date : 2017-06-01DOI: 10.9714/PSAC.2017.19.2.001
S. Yoshida
{"title":"Cryogenic cooling system for HTS cable","authors":"S. Yoshida","doi":"10.9714/PSAC.2017.19.2.001","DOIUrl":"https://doi.org/10.9714/PSAC.2017.19.2.001","url":null,"abstract":"","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"19 1","pages":"1-8"},"PeriodicalIF":0.3,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42129418","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}
Pub Date : 2017-03-31DOI: 10.9714/psac.2017.19.1.013
Huiming Liu, Dong Xu, Fuzhi Shen, Hengcheng Zhang, Laifeng Li
Water issue, especially water pollution, is a serious issue of 21st century. Being an significant technique for securing water resources, superconducting magnetic separation wastewater system was indispensable. A large bore conduction-cooled magnet was custom-tailored for wastewater treatment. The superconducting magnet has been designed, fabricated and tested. The superconducting magnet was composed of NbTi solenoid coils with an effective horizontal warm bore of 400 mm and a maximum central field of 2.56T. The superconducting magnet system was cooled by a two-stage 1.5W 4K GM cryocooler. The NbTi solenoid coils were wound around an aluminum former that is thermally connected to the second stage cold head of the cryocooler through a conductive copper link. The temperature distribution along the conductive link was measured during the cool-down process as well as at steady state. The magnet was cooled down to 4.8K in approximately 65 hours. The test of the magnetic field and quench analysis has been performed to verify the safe operation for the magnet system. Experimental results show that the superconducting magnet reached the designed magnetic performance.
{"title":"Development of large bore superconducting magnet for wastewater treatment application","authors":"Huiming Liu, Dong Xu, Fuzhi Shen, Hengcheng Zhang, Laifeng Li","doi":"10.9714/psac.2017.19.1.013","DOIUrl":"https://doi.org/10.9714/psac.2017.19.1.013","url":null,"abstract":"Water issue, especially water pollution, is a serious issue of 21st century. Being an significant technique for securing water resources, superconducting magnetic separation wastewater system was indispensable. A large bore conduction-cooled magnet was custom-tailored for wastewater treatment. The superconducting magnet has been designed, fabricated and tested. The superconducting magnet was composed of NbTi solenoid coils with an effective horizontal warm bore of 400 mm and a maximum central field of 2.56T. The superconducting magnet system was cooled by a two-stage 1.5W 4K GM cryocooler. The NbTi solenoid coils were wound around an aluminum former that is thermally connected to the second stage cold head of the cryocooler through a conductive copper link. The temperature distribution along the conductive link was measured during the cool-down process as well as at steady state. The magnet was cooled down to 4.8K in approximately 65 hours. The test of the magnetic field and quench analysis has been performed to verify the safe operation for the magnet system. Experimental results show that the superconducting magnet reached the designed magnetic performance.","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"19 1","pages":"13-16"},"PeriodicalIF":0.3,"publicationDate":"2017-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49201218","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}
Pub Date : 2017-03-31DOI: 10.9714/psac.2017.19.1.047
M. Ranot, S. H. Jang, K. Shinde, B. Sinha, A. Bhardwaj, Y. Oh, Seong-Hoon Kang, K. Chung
{"title":"A safe and cost-effective PMMA carbon source for MgB2","authors":"M. Ranot, S. H. Jang, K. Shinde, B. Sinha, A. Bhardwaj, Y. Oh, Seong-Hoon Kang, K. Chung","doi":"10.9714/psac.2017.19.1.047","DOIUrl":"https://doi.org/10.9714/psac.2017.19.1.047","url":null,"abstract":"","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"19 1","pages":"47-50"},"PeriodicalIF":0.3,"publicationDate":"2017-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43569969","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}
Pub Date : 2017-03-31DOI: 10.9714/psac.2017.19.1.026
Chan Kim, M. Kim, H. Park, H. Ri
We studied the distribution of the current density and its magnetic-field dependence in GdBCO coated conductors with AC bias currents using low temperature scanning Hall probe microscopy. We selectively measured magnetic field profiles from AC signal obtained by Lock-in technique and calculated current distributions by inversion calculation. In order to confirm the AC measurement results, we applied DC current corresponding to RMS value of AC current and compared distribution of AC and DC transport current. We carried out the same measurements at various external DC magnetic fields, and investigated field dependence of AC current distribution. We notice that the AC current distribution unaffected by external magnetic fields and preserved their own path on the contrary to DC current.
{"title":"Selective detection of AC transport current distributions in GdBCO coated conductors using low temperature scanning Hall probe microscopy","authors":"Chan Kim, M. Kim, H. Park, H. Ri","doi":"10.9714/psac.2017.19.1.026","DOIUrl":"https://doi.org/10.9714/psac.2017.19.1.026","url":null,"abstract":"We studied the distribution of the current density and its magnetic-field dependence in GdBCO coated conductors with AC bias currents using low temperature scanning Hall probe microscopy. We selectively measured magnetic field profiles from AC signal obtained by Lock-in technique and calculated current distributions by inversion calculation. In order to confirm the AC measurement results, we applied DC current corresponding to RMS value of AC current and compared distribution of AC and DC transport current. We carried out the same measurements at various external DC magnetic fields, and investigated field dependence of AC current distribution. We notice that the AC current distribution unaffected by external magnetic fields and preserved their own path on the contrary to DC current.","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"19 1","pages":"26-29"},"PeriodicalIF":0.3,"publicationDate":"2017-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44782908","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}
Pub Date : 2017-03-31DOI: 10.9714/PSAC.2017.19.1.036
Sang-Hyun Kim, W. Kang, B. Jun, Y. J. Lee, C. Kim
The effects of MgB 4 addition on the superconducting properties and the microstructure of in situ processed MgB bulk superconductors were studied. MgB 4 powder of 1-20 wt.% was mixed with (Mg + 2B) powder and then pressed into pellets. The pellets of (Mg + 2B + xMgB 4 ) were heat-treated at 650 ℃ for 1 h in flowing argon. The powder X-ray diffraction (XRD) analysis for the heat-treated samples showed that the major formed phase in all samples was MgB 2 and the minor phases were MgB 4 and MgO. The full width at half maximum (FWHM) values showed that the grain size of MgB 2 decreased as the amount of MgB 4 addition increased. MgB 4 particles included in a MgB 2 matrix is considered to suppress the grain growth of MgB 2 . The onset temperatures ( T c,onset ) of MgB 2 with MgB 4 addition (0-10 wt.%) was between 37-38 K. The 20 wt.% MgB 4 addition slightly reduced the T c,onset of MgB 2 to 36.5 K. This result indicates that MgB 4 addition did not influence the superconducting transition temperature ( T c ) of MgB 2 significantly. On the other hand, the small additions of 1-5 wt.% MgB 4 increased the critical current density ( J c ) of MgB 2 . The J c enhancement by MgB 4 addition is attributed not only to the grain size refinement but also to the possible flux pinning of MgB 4 particles dispersed in a MgB 2 matrix.
{"title":"Enhanced critical current density of in situ processed MgB2 bulk superconductors with MgB4 additions","authors":"Sang-Hyun Kim, W. Kang, B. Jun, Y. J. Lee, C. Kim","doi":"10.9714/PSAC.2017.19.1.036","DOIUrl":"https://doi.org/10.9714/PSAC.2017.19.1.036","url":null,"abstract":"The effects of MgB 4 addition on the superconducting properties and the microstructure of in situ processed MgB bulk superconductors were studied. MgB 4 powder of 1-20 wt.% was mixed with (Mg + 2B) powder and then pressed into pellets. The pellets of (Mg + 2B + xMgB 4 ) were heat-treated at 650 ℃ for 1 h in flowing argon. The powder X-ray diffraction (XRD) analysis for the heat-treated samples showed that the major formed phase in all samples was MgB 2 and the minor phases were MgB 4 and MgO. The full width at half maximum (FWHM) values showed that the grain size of MgB 2 decreased as the amount of MgB 4 addition increased. MgB 4 particles included in a MgB 2 matrix is considered to suppress the grain growth of MgB 2 . The onset temperatures ( T c,onset ) of MgB 2 with MgB 4 addition (0-10 wt.%) was between 37-38 K. The 20 wt.% MgB 4 addition slightly reduced the T c,onset of MgB 2 to 36.5 K. This result indicates that MgB 4 addition did not influence the superconducting transition temperature ( T c ) of MgB 2 significantly. On the other hand, the small additions of 1-5 wt.% MgB 4 increased the critical current density ( J c ) of MgB 2 . The J c enhancement by MgB 4 addition is attributed not only to the grain size refinement but also to the possible flux pinning of MgB 4 particles dispersed in a MgB 2 matrix.","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"19 1","pages":"36-41"},"PeriodicalIF":0.3,"publicationDate":"2017-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49411513","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}
Pub Date : 2017-03-31DOI: 10.9714/psac.2017.19.1.022
Hee-Won Kwon, Joon-Ha Kim, D. Ha, J. Choi, Young-Hun Kim
2017) Abstract Steel slag has been considered as an industrial waste. A huge amount of slag is produced as a byproduct and the steel slag usually has been dumped in a landfill site. However the steel slag contains valuable resources such as iron, copper, manganese, and magnesium. Superconducting magnetic separation has been applied on recovery of the valuable resources from the steel slag and this process also has intended to reduce the waste to be dumped. Cryo-cooled Nb-Ti superconducting magnet with 100 mm bore and 600 mm of height was used as the magnetic separator. The separating efficiency was evaluated in the function of magnetic field. A steel slag was ground and analyzed for the composition. Iron containing minerals were successfully concentrated from less iron containing portion. The separation efficiency was highly dependent on the particle size giving higher separating efficiency with finer particle. The magnetic field also effects on the separation ratio. Current study showed that an appropriate grinding of slag and magnetic separation lead to the recovery of metal resources from steel slag waste rather than dumping all of the
{"title":"Superconducting magnetic separation of ground steel slag powder for recovery of resources","authors":"Hee-Won Kwon, Joon-Ha Kim, D. Ha, J. Choi, Young-Hun Kim","doi":"10.9714/psac.2017.19.1.022","DOIUrl":"https://doi.org/10.9714/psac.2017.19.1.022","url":null,"abstract":"2017) Abstract Steel slag has been considered as an industrial waste. A huge amount of slag is produced as a byproduct and the steel slag usually has been dumped in a landfill site. However the steel slag contains valuable resources such as iron, copper, manganese, and magnesium. Superconducting magnetic separation has been applied on recovery of the valuable resources from the steel slag and this process also has intended to reduce the waste to be dumped. Cryo-cooled Nb-Ti superconducting magnet with 100 mm bore and 600 mm of height was used as the magnetic separator. The separating efficiency was evaluated in the function of magnetic field. A steel slag was ground and analyzed for the composition. Iron containing minerals were successfully concentrated from less iron containing portion. The separation efficiency was highly dependent on the particle size giving higher separating efficiency with finer particle. The magnetic field also effects on the separation ratio. Current study showed that an appropriate grinding of slag and magnetic separation lead to the recovery of metal resources from steel slag waste rather than dumping all of the","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"19 1","pages":"22-25"},"PeriodicalIF":0.3,"publicationDate":"2017-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43813128","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}
Pub Date : 2017-03-31DOI: 10.9714/PSAC.2017.19.1.009
T. Hasegawa, H. Nakagami, Y. Akiyama, S. Nishijima
Recently, DNA vaccination is attracting attentions as a new therapeutic method for lifestyle diseases and autoimmune diseases. However, its clinical applications are limited because a safe and efficient gene transfer method has not been established yet. In this study, a new method of gene transfer was proposed which utilizes the jet injection and the magnetic transfection. The jet injection is a method to inject medical liquid by momentary high pressure without needle. The injected liquid diffuses in the bio tissue and the endocytosis is considered to be improved by the diffusion. The magnetic transfection is a method to deliver the conjugates of plasmid DNA and magnetic particles to the desired site by external magnetic field. It is expected that jet injection of the conjugates causes slight membrane disruptions and the traction of the conjugates by magnetic field induces the efficient gene transfer. In conclusion, the possibility of improvement of the gene expression by the combination of jet injection and magnetic transfection was confirmed.
{"title":"Fundamental study on gene transfer utilizing magnetic force and jet injector","authors":"T. Hasegawa, H. Nakagami, Y. Akiyama, S. Nishijima","doi":"10.9714/PSAC.2017.19.1.009","DOIUrl":"https://doi.org/10.9714/PSAC.2017.19.1.009","url":null,"abstract":"Recently, DNA vaccination is attracting attentions as a new therapeutic method for lifestyle diseases and autoimmune diseases. However, its clinical applications are limited because a safe and efficient gene transfer method has not been established yet. In this study, a new method of gene transfer was proposed which utilizes the jet injection and the magnetic transfection. The jet injection is a method to inject medical liquid by momentary high pressure without needle. The injected liquid diffuses in the bio tissue and the endocytosis is considered to be improved by the diffusion. The magnetic transfection is a method to deliver the conjugates of plasmid DNA and magnetic particles to the desired site by external magnetic field. It is expected that jet injection of the conjugates causes slight membrane disruptions and the traction of the conjugates by magnetic field induces the efficient gene transfer. In conclusion, the possibility of improvement of the gene expression by the combination of jet injection and magnetic transfection was confirmed.","PeriodicalId":20758,"journal":{"name":"Progress in Superconductivity and Cryogenics","volume":"19 1","pages":"9-12"},"PeriodicalIF":0.3,"publicationDate":"2017-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45741376","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}
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