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Current Limitation byBi-2223 Bifilar Winding Coils
안민철,윤용수,고태국,배덕권,박동근,양성은 한국초전도.저온공학회 2005 한국초전도저온공학회논문지 Vol.7 No.2
There are many kinds of high temperature superconducting (HTS) application using Bi-2223 tape which is the most commercialized HTS material. Also, resistive superconducting fault current limiters (SFCLs) have been developed using many kinds of superconducting material such as YBCO thin film, Bi-2212 bulk and so on. However, SFCL using Bi-2223 tape has never been developed. This paper deals with the feasibility study on SFCL using Bi-2223 wire. The over-current behaviors of Bi-2223 short-length sample were measured. To make the resistive SFCL, two small-scale bifilar winding modules using 7m Bi-2223 wire were fabricated; i.e. solenoid type bifilar coil and pancake type one. The short-circuit tests of the coils were successfully performed up to 16 Vrms. From these tests, the current limiting capabilities of Bi-2223 bifilar coils were confirmed and current limiting performances between two winding types were compared. In addition, the feasibility of resistive SFCL using another HTS wire, i.e. YBCO coated conductor, was also investigated.
직접접촉식 막증발 공정을 위한 소수성 Polyvinylidene fluoride 막 제조
안민철,이상호,최용준,최지혁,김유식 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
직접접촉식 막증발법(DCMD, Direct contact membrane distillation)은 공급액과 투과액이 모두 막과 직접 접촉하고, 투과되는 증기를 응축시켜 생산수를 얻는 방법이다. DCMD 공정은 플럭스가 높고, 공정이 단순하다는 장점이 있지만 막젖음(Wetting) 발생이 쉽다는 문제를 가지고 있다. 따라서 본 연구는 DCMD의 막젖음 방지를 위해 에탄올을 넣어 비용매의 조성을 변화시키고, NIPS(Nonsolvent induced phase separation) 방법을 이용해 소수성 PVDF 막을 제조하였다. 그리고 만든 막의 CA(Contact angle), LEP(Liquid entry pressure), porosity, 막 두께 등을 측정 후 비교 분석하여 제막 최적 조건을 도출하였다.
안민철 한국초전도.저온공학회 2018 한국초전도저온공학회논문지 Vol.20 No.2
Although high-temperature superconducting (HTS) magnets have the potential merit of producing ultra-high field (>25 T), they have been not easy to apply to Nuclear Magnetic Resonance (NMR) because of the difficulty of field homogeneity improvement. This paper presents a design technique of passive shimming for HTS magnets. Ferromagnetic shimming design code was developed though MALAB, which includes the optimization algorithm. The proper shim element size was determined by a simulation. This design technique was verified by a case study design of a 3-T HTS magnet. We succeed to improve field homogeneity of the magnet from 634 ppm to 6.39 ppm at 10-mm diameter sphere volume. Feasibility of passive shimming for all-HTS NMR magnet was confirmed by this result.