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Zhang, Ziyu,Tan, Jibo,Wu, Xinqiang,Han, En-Hou,Ke, Wei Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.9
Corrosion fatigue crack growth (FCG) behavior of 316LN stainless steel was investigated in high-temperature pressurized water at different temperatures, load ratios (R = K<sub>max</sub>/K<sub>min</sub>) and rise times (t<sub>R</sub>). The environmental assisted effect on FCG rate was observed when both the R and t<sub>R</sub> exceeded their critical values. The FCG rate showed a linear relation with stress intensity factor range (ΔK) in double logarithmic coordinate. The environmental assisted effect on FCG rate depended on the ΔK and quantitative relations were proposed. Possible mechanisms of environmental assisted FCG rate under different testing conditions are also discussed.
A Study on the Return Phenomenon of China Overseas Talent Studying in the Post-Epidemic Era
Ziyu Zhang,Huang Yang,Yuzhu Duan KOREA INSTITUTE FOR HUMANITIES AND SOCIAL SCIENCES 2024 Journal of Global Area Studies Review(GAS) Vol.3 No.1
China has been committed to attracting and retaining overseas Chinese students in order to promote innovation and development in the country. The Central Organization Department has developed a series of policies and initiatives aimed at supporting overseas Chinese students in their innovation and entrepreneurship in China. However, covid-19 has had an impact on the phenomenon of overseas Chinese students returning home, which has also raised concerns. Objective: This study aims to explore the policy initiatives of the Central Organization Department and the changing trends of the phenomenon of overseas Chinese students returning home, with a view to providing useful references for China in attracting and retaining overseas Chinese students. Methods: Through literature review and policy analysis, an in-depth analysis was conducted on the policy initiatives of the Central Organization Department and the phenomenon of overseas Chinese students returning to China. Results: The study found that the Central Organization Department set strategic goals in supporting key national innovation projects, focusing on supporting innovation and entrepreneurship of top overseas Chinese students in China. Meanwhile, the phenomenon of overseas Chinese students returning to China after COVID-19 shows a certain trend of change. Conclusion: Research findings indicate that the COVID-19 pandemic has spurred a wave of overseas Chinese students’ returning to China which increases the domestic supply of talent. Governments and educational institutions should provide more support to those graduates adapting to the domestic employment market. What’s more, overseas Chinese students should actively seek opportunities, enhance their competitiveness, adapt flexibly to market changes, and prepare for future career aspirations.
Huihui Gong,Ziyu Yin,Dechao Chen,Long Jin,Yunong Zhang 제어로봇시스템학회 2017 제어로봇시스템학회 국제학술대회 논문집 Vol.2017 No.10
A fault-tolerant scheme at the acceleration-level for motion planning and control (MPaC) of redundant manipulator is proposed and presented by incorporating the dimension-reduction method and neural-dynamics based quadratic program (QP) including solution. More importantly, numerical and practical experiments based on a six-link planar redundant robot manipulator are presented in this paper to substantiate the physical realizability, efficacy and accuracy of the fault-tolerant scheme for redundant manipulator MPaC and the neural-dynamics based QP.
Yonghong Hu,Bo Cai,Ziyu Hu,Yanli Liu,Shengli Zhang,Haibo Zeng 한국물리학회 2015 Current Applied Physics Vol.15 No.3
The structural, electronic and optical properties of wurtzite MgZnO with Mg concentration ranging from 0 to 0.5 are studied using the first principle calculations. It's found that the lattice constants c and specific volume V of the MgZnO alloys decrease and their band gap widens as Mg concentration increases, which are in agreement with our experimental results. A particular Mg concentration is found to exist at around 0.375, equals to which the corresponding MgZnO alloy has the minimum width of the top valence band. This indicates that Mg concentration may be used to tune the electronic properties of MgZnO alloy. Meanwhile, it's also found that the energy response range of the optical spectrums decreases with the increase of Mg concentration. There are different energy shifts toward high energy (blue shift) of the peaks in the optical spectrums with the increase of Mg concentration, which are explained by the variations of the density of states in details. So the electronic and optical properties of MgZnO may be tuned through Mg concentration, and our research results may provide meaningful references to the development and design of photoelectric devices.
Xiaofeng Li,Yaping Tao,Ziyu Hu,Shengli Zhang 한국물리학회 2015 Current Applied Physics Vol.15 No.9
The mechanical and thermodynamic properties, chemical bonding characteristics and electronic structure of Nb2MB2 (M = Mo, W, Re or Os) with a new tetragonal U3Si2-type superstructure (space group P4/ mnc, no. 128) were studied by means of density functional theory calculations. All Nb2MB2 structures studied were demonstrated to be thermodynamically and mechanically stable. The bulk, shear and Young's moduli, Poisson's ratio, Debye temperature and anisotropy factors were derived for ideal polycrystalline Nb2MB2 aggregates. Among these compounds, Nb2WB2 was found to have the highest shear modulus and hardness. The electronic densities of state and electronic localization function analysis revealed the metallicity and strong covalent BeB, NbeB and MB bonding in Nb2MB2. Moreover, these results reveal that the covalence between Nb 4d, M nd (n = 4 for Mo and 5 for W, Re and Os) and B 2p states is the cause of the relatively higher elastic modulus and hardness of the Nb-based compounds. Finally, thermodynamic properties, including the bulk modulus, heat capacity and thermal expansion coefficient of Nb2WB2 were obtained systematically under high temperature and pressure.
Xin Ji,Chenggen Jin,Ke Ji,Ji Zhang,Xiaojiang Wu,Ziyu Jia,Zhaode Bu,Jiafu Ji 대한암학회 2021 Cancer Research and Treatment Vol.53 No.3
Purpose The aim of the present study was to compare the difference between double tract reconstruction and esophagogastrostomy.Materials and Methods Patients who underwent radical proximal gastrectomy with esophagogastrostomy or double tract reconstruction were included in this study.Results Sixty-four patients were included in this study and divided into two groups according to reconstruction method. The two groups were well balanced in perioperative safety and 3-year overall survival (OS). The rates of postoperative reflux esophagitis in the double tract reconstruction group and esophagogastrostomy group were 8.0% and 30.8%, respectively (p=0.032). Patients in the double tract reconstruction group had a better global health status (p < 0.001) and emotional functioning (p < 0.001), and complained less about nausea and vomiting (p < 0.001), pain (p=0.039), insomnia (p=0.003), and appetite loss (p < 0.001) based on the European Organization for Research and Treatment of Cancer (EORTC) QLQ-C30 questionnaire. Regarding the EORTC QLQ-STO22 questionnaire, patients in the double tract reconstruction group complained less about dysphagia (p=0.030), pain (p=0.008), reflux (p < 0.001), eating (p < 0.001), anxiety (p < 0.001), dry mouth (p=0.007), and taste (p=0.001). The multiple linear regression analysis showed that reconstruction method, postoperative complications, reflux esophagitis, and operation duration had a linear relationship with the global health status score.Conclusion Double tract reconstruction could better prevent reflux esophagitis and improve quality of life without scarifying perioperative safety or 3-year OS.
Environmental fatigue correction factor model for domestic nuclear-grade low-alloy steel
Gao, Jun,Liu, Chang,Tan, Jibo,Zhang, Ziyu,Wu, Xinqiang,Han, En-Hou,Shen, Rui,Wang, Bingxi,Ke, Wei Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.8
Low cycle fatigue behaviors of SA508-3 low-alloy steel were investigated in room-temperature air, high-temperature air and in light water reactor (LWR) water environments. The fatigue mean curve and design curve for the low-alloy steel are developed based on the fatigue data in room-temperature and high-temperature air. The environmental fatigue model for low-alloy steel is developed by the environmental fatigue correction factor (F<sub>en</sub>) methodology based on the fatigue data in LWR water environments with the consideration of effects of strain rate, temperature, and dissolved oxygen concentration on the fatigue life.
Hanxing He,Gefei Li,Jiantao Zhang,Jinlong Zhang,Mingyue Luo,Wenkai Hu,Yamin Lin,Ziyu Deng,Zhicheng Liu,Weizhao Chen,Xu Deng 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.5
A genetic approach was proposed to modify the characteristics of Bacillus subtilis strain WB800 (B. subtilis WB800) for selfhealing of concrete cracks. Three genes, namely gerAa which encodes germination receptors activated by L-alanine, tupA which is responsible for the synthesis of teichuronopeptide, and ca which encodes carbonic anhydrase (CA) catalyzing the synthesis of carbonate ion, were separately transformed into WB800. To protect bacterial cells from being squeezed, microspheres were produced with microcrystal cellulose (MCC) before the introduction of bacteria into the specimens. The results showed that the modified B. subtilis expressing GerA achieved 39.9% of germination ratio compared to 17% by the original host cells. With the transformation of tupA, the modified strain demonstrated higher resistance to alkaline environments, tolerating pH as high as 11, while the original strain only tolerated pH 9. The modified strain expressing CA induced more calcium carbonate than the original cells. Energy dispersive spectroscopy (EDS) identified the produced precipitate to be calcite (CaCO3). Moreover, a mathematical model was developed to optimize the influential factors of calcium precipitation process. Finally, based on the above results, an effective self-healing of concrete crack was achieved. This study may provide a promising strategy to improve the efficiency of bacterial self-healing of concrete cracks.