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        Effects of fission product doping on the structure, electronic structure, mechanical and thermodynamic properties of uranium monocarbide: A first-principles study

        Ru-Ting Liang,Tao Bo,Wan-Qiu Yin,Chang-Ming Nie,Lei Zhang,Zhi-Fang Chai,Wei-Qun Shi Korean Nuclear Society 2023 Nuclear Engineering and Technology Vol.55 No.7

        A first-principle approach within the framework of density functional theory was employed to study the effect of vacancy defects and fission products (FPs) doping on the mechanical, electronic, and thermodynamic properties of uranium monocarbide (UC). Firstly, the calculated vacancy formation energies confirm that the C vacancy is more stable than the U vacancy. The solution energies indicate that FPs prefer to occupying in U site rather than in C site. Zr, Mo, Th, and Pu atoms tend to directly replace U atom and dissolve into the UC lattice. Besides, the results of the mechanical properties show that U vacancy reduces the compressive and deformation resistance of UC while C vacancy has little effect. The doping of all FPs except He has a repairing effect on the mechanical properties of U<sub>1-x</sub>C. In addition, significant modifications are observed in the phonon dispersion curves and partial phonon density of states (PhDOS) of UC<sub>1-x</sub>, Zr<sub>x</sub>U<sub>1-x</sub>C, Mo<sub>x</sub>U<sub>1-x</sub>C, and Rh<sub>x</sub>U<sub>1-x</sub>C, including narrow frequency gaps and overlapping phonon modes, which increase the phonon scattering and lead to deterioration of thermal expansion coefficient (α<sub>V</sub>) and heat capacity (C<sub>p</sub>) of UC predicted by the quasi harmonic approximation (QHA) method.

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        Fatty Acid Profile of Muscles from Crossbred Angus-Simmental, Wagyu-Simmental, and Chinese Simmental Cattles

        Ting Liu,Jian-Ping Wu,Zhao-Min Lei,Ming Zhang,Xu-Yin Gong,Shu-Ru Cheng,Yu Liang,Jian-Fu Wang 한국축산식품학회 2020 한국축산식품학회지 Vol.40 No.4

        This study assessed breed differences in fatty acid composition and meat quality of Longissimus thoracis et lumborum (LTL) and semitendinosus (SE) of Angus× Chinese Simmental (AS), Wagyu×Chinese Simmental (WS), and Chinese Simmental (CS). CS (n=9), AS (n=9) and WS (n=9) were randomly selected from a herd of 80 bulls which were fed and managed under similar conditions. Fatty acid profile and meat quality parameters were analyzed in duplicate. Significant breed difference was observed in fatty acid and meat quality profiles. AS exhibited significantly (p<0.05) lower C16:0 and higher C18:1n9c compared with CS. AS breed also had a tendency (p<0.10) to lower total saturated fatty acid (SFA), improve C18:3n3 and total unsaturated fatty acid (UFA) compared with CS. Crossbreed of AS and WS had significantly (p<0.05) improved the lightness, redness, and yellowness of muscles, and lowered cooking loss, pressing loss, and shear force compared with CS. These results indicated that fatty acid composition and meat quality generally differed among breeds, although the differences were not always similar in different tissues. Fatty acid composition, meat color, water holding capacity, and tenderness favored AS over CS. Thus, Angus cattle might be used to improve fatty acid and meat quality profiles of CS, and AS might contain better nutritive value, organoleptic properties, and flavor, and could be potentially developed as an ideal commercial crossbreed.

      • Network Isolation in Electrical Vehicle Charging Station

        Zhan Xiong,Liu Jian,Liang Xiao,Zhao Ting,Tian Wei,Rao Xue,Ru Yeqi 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.5

        Network isolation system (NIS) can help electrical vehicle charging station (EVCS) to exchange messages with different systems (such as central monitor system, battery package and electrical vehicle (EV)) in a secure and efficient way. This paper focuses on the structure of EVCS, and then analyzes the boundaries of the trusted and the untrusted areas. On the top boundary, EVCS can communicate with the central monitor system. On bottom boundary, EVCS can communicate with EVs or battery packages. Based on this demarcation, this paper proposes the NIS architecture for EVCS. The new architecture can limit the top/bottom boundary of EVCS to enhance the securities

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