• 제목/요약/키워드: Nuclear Fusion

검색결과 573건 처리시간 0.038초

핵이식에 의한 복제동물 생산의 최근 연구 성과 (Recent Research on Production of Cloned Animals by Nuclear Transplantation)

  • 박충생
    • 한국수정란이식학회지
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    • 제8권1호
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    • pp.37-44
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    • 1993

  • Nuclear transplantation techinque has been found to be the most potential and efficient method for producing a large number of genetically identical animals from a single embryo. The technical development of nuclear transplantation in mammals and its application to the production of cloned animals were reviewed. For the efficient and successful production of cloned embryos by nuclear transplantation, selection and micromanipulation of recipient eggs or embryos as capacious recipient cytoplasm, and benefitial preparation of multiple totipotent embryonic cells as donor nuclei, and also fusion technique are very critical. Recent works approaching to these critical points were introduced and discussed.

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불활성기체용해-열전도도검출법에 의한 수소분석시 티타늄 및 지르코늄-2.5니오븀 시료의 매질효과 (Matrix effect of Ti and Zr-2.5Nb sample for hydrogen analysis by Inert Gas Fusion-Thermal Conductivity Detection(IGF-TCD) Method)

  • 박순달;최계천;김정석;조기수;김종구;김원호
    • 분석과학
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    • 제16권4호
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    • pp.261-268
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    • 2003

  • 불활성기체용해-열전도도검출법에 의한 수소분석시 매질효과를 조사하기 위해 티타늄 및 지르코늄-2.5니오븀 매질의 수소 표준물질 및 수소기체 주입에 의한 교정계수를 측정하였다. 또한 주석 조연제를 사용하지 않고 티타늄 및 지르코늄-2.5니오븀 매질 수소 표준물질의 수소 추출효율을 조사하였다. 수소기체 주입에 의한 수소분석기의 보정에 대해 지르코늄-2.5니오븀 매질 수소표준물질의 그것은 2~3% 높았으며, 티타늄 매질의 수소 표준물질은 약 14% 높은 값을 주었다. 교정계수 측정결과에 의하면 티타늄 매질 시료의 수소추출 효율이 지르코늄-2.5니오븀 매질 시료에 비해 약 12% 낮을 것으로 예상된다. 주석을 사용하지 않았을 때 티타늄 및 지르코늄-2.5니오븀매질 수소 표준물질의 수소 회수율은 약 70% 이었으며, 티타늄의 수소 회수율이 지르코늄-2.5니오븀 보다 낮았다.

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Three-dimensional thermal-hydraulics/neutronics coupling analysis on the full-scale module of helium-cooled tritium-breeding blanket

  • Qiang Lian;Simiao Tang;Longxiang Zhu;Luteng Zhang;Wan Sun;Shanshan Bu;Liangming Pan;Wenxi Tian;Suizheng Qiu;G.H. Su;Xinghua Wu;Xiaoyu Wang
    • Nuclear Engineering and Technology
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    • 제55권11호
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    • pp.4274-4281
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    • 2023

  • Blanket is of vital importance for engineering application of the fusion reactor. Nuclear heat deposition in materials is the main heat source in blanket structure. In this paper, the three-dimensional method for thermal-hydraulics/neutronics coupling analysis is developed and applied for the full-scale module of the helium-cooled ceramic breeder tritium breeding blanket (HCCB TBB) designed for China Fusion Engineering Test Reactor (CFETR). The explicit coupling scheme is used to support data transfer for coupling analysis based on cell-to-cell mapping method. The coupling algorithm is realized by the user-defined function compiled in Fluent. The three-dimensional model is established, and then the coupling analysis is performed using the paralleled Coupling Analysis of Thermal-hydraulics and Neutronics Interface Code (CATNIC). The results reveal the relatively small influence of the coupling analysis compared to the traditional method using the radial fitting function of internal heat source. However, the coupling analysis method is quite important considering the nonuniform distribution of the neutron wall loading (NWL) along the poloidal direction. Finally, the structure optimization of the blanket is carried out using the coupling method to satisfy the thermal requirement of all materials. The nonlinear effect between thermal-hydraulics and neutronics is found during the blanket structure optimization, and the tritium production performance is slightly reduced after optimization. Such an adverse effect should be thoroughly evaluated in the future work.

  • https://doi.org/10.1016/j.net.2023.08.005 인용 PDF

PET & MRI Fusion Imaging

  • 조장희
    • 대한핵의학회:학술대회논문집
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    • 대한핵의학회 2006년도 제45차 춘계학술대회
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    • pp.3-3
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    • 2006

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