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Xuexi Zhang(Xuexi Zhang),Xi Chen(Xi Chen) 아시아사회과학학회 2023 Jornal of Asia Social Science Vol.10 No.1
Since 2020, the Japanese government has made great efforts to promote the discharge of nuclear-polluted water from the Fukushima nuclear power plant. Although it is strongly opposed by the Japanese and neighboring countries, the Japanese government still puts economic benefits first and does not fully consider the biological and chemical hazards that may be caused by the discharge of nuclear-polluted water into the sea, the impact on people's health, or whether it will pose a threat to Japan's offshore and neighboring countries' marine safety and food safety. As always, it is an obvious violation of the United Nations Convention on the Law of the Sea to choose the simplest, lowest-cost, and most irresponsible way to discharge nuclear-polluted water into the sea, which needs to be highly valued by neighboring countries and even all countries around the Pacific Ocean, and actively take measures to avoid the harm caused by Japan's nuclear-polluted water discharged into the sea to neighboring countries. To solve the current problems, it is necessary for the United Nations to actively play the role of central mediator and for neighboring countries to jointly create international public opinion on the harm caused by the discharge of nuclear-polluted water into the sea. At the same time, it is also necessary to call on non-governmental environmental protection organizations to protest and continuously increase internal pressure in Japan. In addition, the active resistance to importation of the fish resources from Japan and the reduction in the number of tourists to Japan are also important measures to prevent the Japanese government from dumping nuclear-polluted water. Therefore, actively calling on the Japanese government to cancel or terminate the dumping of nuclear-polluted water into the sea is not only the greatest protection of the lives and property of people in Japan and neighboring countries, but a responsible expression of ensuring that the world's maritime security is not threatened.
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Mesoscale Deformation Incompatibility Analysis of DP1180 Steel
Bingying Zhou,Yisheng Zhang,Xuexi Cui,Fei Han,Bobin Guan,Xiangdong Wu,Min Wan 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.10
Advanced high-strength steel (AHSS) is of great technological interest in automotive lightweight applications. The dualphase (DP) steel with a higher volume fraction of martensite has been rarely studied. In this work, the micromechanical deformation incompatibility of DP1180 steel was analyzed by a microstructure-based representative volume element (RVE) model. Via the electron-backscattered diffraction (EBSD) and the open-source software DREAM.3D, the statistically real microstructure-based RVE model was established. The flow curve of ferrite was obtained by the dislocation-based method. And the flow curve of martensite was obtained by the isostrain method (ISM) and the non-isostrain method (NISM). The simulation results showed good coincidence with the experiments. Furthermore, the ISM and the NISM were well clarified and improved. The microscale stress and strain in ferrite and martensite are approximately normal distributions due to the deformation incompatibility. The simulations verified that martensite carries much higher stress than ferrite. The mean value of strain in martensite is smaller than that in ferrite. And the strain variances of ferrite and martensite are similar. A larger variation range of stress triaxiality in ferrite indicates that the ferrite has gone through a more complex stress state. While the martensite has been approaching from the tension–compression state to the uniaxial-tension state. Consequently, the strain localization and damage initiation are predicted to be preferentially through ferrite compared to martensite, which is in good agreement with the results of the in situ tensile test. This paper provides a detailed analysis of the deformation incompatibility of the DP steel, especially in which the volume fraction of martensite is larger than that of ferrite. And it has theoretical significance for accurately predicting the micromechanical deformation behavior of multi-phase materials.
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