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( Huofeng Jiang ),( Yamin Gao ),( Sheng Zeng ),( Shuai Wang ),( Zhizhong Cao ),( Yaoju Tan ),( Huancai Yin ),( Jianxiong Liu ),( Tianyu Zhang ) 한국미생물생명공학회(구 한국산업미생물학회) 2019 Journal of microbiology and biotechnology Vol.29 No.9
The rising cases of multidrug-resistant Acinetobacter baumannii (Ab) and the lack of effective drugs call for quick attention. Here, based on a Tn7 transposon and Xer/dif system, we constructed a stable, selectable marker-free autoluminescent Ab capable of producing visible light without extra substrates. Utilization of this autoluminescent reporter strain has the potential to reduce the time, effort and costs required for the evaluation of activities of anti-Ab drug candidates in vitro.
Corrosion behavior of refractory metals in liquid lead at 1000 °C for 1000 h
Zunqi Xiao,Jing Liu,Zhizhong Jiang,Lin Luo 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.6
Lead-based fast reactor (LFR) has become one of the most promising reactors for Generation IV nuclearsystems. A developing trend of LFR is high efficiency, along with operation temperatures up to 800 C oreven higher. One of key issues in the high-efficiency LFR is corrosion of cladding materials with lead athigh temperatures. In this study, corrosion behavior of some refractory metals (Nb, Nb521, and Mo-0.5La)was investigated in static lead at 1000 C for 1000 h. The results showed that Nb and Nb521 exhibited anintense dissolution corrosion with obvious lead penetration after corrosion, and lead penetrationextended along the grain boundaries of the specimens. Furthermore, Nb521 showed a better corrosionresistance than that of Nb as a result of the elements of W and Mo included in Nb521. Mo-0.5La showedmuch better corrosion resistance than that of Nb and Nb521, and no lead penetration could be observed. However, an etched morphology appeared on the surface of Mo-0.5La, indicating the occurrence ofcorrosion to a certain degree. The results indicate that Mo-0.5La is compatible with lead up to 1000 C. While Nb and
Zunqi Xiao,Jing Liu,Zhizhong Jiang,Lin Luo,Qunying Huang 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.6
The liquid lead-lithium (Pbe17Li) blanket has many applications in fusion reactors due to its good tritiumbreeding performance, high heat transfer efficiency and safety. The compatibility of liquid Pbe17Li alloywith the structural material of blanket under magnetic field is one of the concerns. In this study,corrosion experiments China low activation martensitic (CLAM) steel and 316L steel were carried out in aforced convection Pbe17Li loop under 1.0 T magnetic field at 480 C for 1000 h. The corrosion results on316L steel showed the characteristic with a superficial porous layer resulted from selective leaching ofhigh-soluble alloy elements and subsequent phase transformation from austenitic matrix to ferriticphase. Then the porous layers were eroded by high-velocity jet fluid. The main corrosion mechanism ofCLAM steel was selective dissolution-base corrosion attack on the microstructure boundary regions andexclusively on high residual stress areas. CLAM steel performed a better corrosion resistance than that of316L steel. The high Ni dissolution rate and the erosion of corroded layers are the main causes for thesevere corrosion of 316L steel.
Effect of Front and Rear Rotor Stages on Aeroelasticity in Multi-Stage Environment
Xiaobo Zhang,Yanrong Wang,Xianghua Jiang,Zhizhong Fu 한국항공우주학회 2019 International Journal of Aeronautical and Space Sc Vol.20 No.1
An energy method based on the mixing-plane model and phase lagged boundary condition has been developed to estimate the flutter characteristics of rotor blades in multi-stage environment. The effects of front and rear rotor stages on the aerodynamic damping of the rotor blades have been investigated using this method. The results show that the mixing-plane model enables to consider the averaging effect of the other stages on the aeroelasticity of the checked rotor blades without having to perform the unsteady full annual multi-stage (FAMS) flow computations. Comparing with the isolated rotor blade, the upstream and downstream rotor stages have a significant influence on the aeroelasticity of the rotor blade with altering the intensity and location of the shock wave and separation flow region on suction surface. It is worth to point out that the neighbor rotor stages reduce the effect of the inter-blade phase angle (IBPA) on the aerodynamic damping. Moreover, the impact of the rear rotor stage on aerodynamic damping of the rotor blade is more remarkable than that of the front one. Compared to the measured data, the capability of this method used in the aeroelasticity assessment of a multi-stage turbomachine has been validated. Furthermore, the relationship between the aerodynamic damping and the motion of the shock wave has been revealed, which can assist the compressor design.