The Kinetics of Anodic Dissolution and Repassivation on 316L Stainless Steel in Borate Buffer Solution Studied by Abrading Electrode Technique

( H S Xu1 ),( D B Sun ),( H Y Yu ),( H M Meng ) 한국부식방식학회 2015 Corrosion Science and Technology Vol.14 No.6

The capacity of passive metal to repassivate after film damage determines the development of local corrosion and the resistance to corrosion failures. In this work, the repassivation kinetics of 316L stainless steel (316LSS) was investigated in borate buffer solution (pH 9. 1) using a novel abrading electrode technique. The repassivation kinetics was analyzed in terms of the current density flowing from freshly bare 316L SS surface as measured by a potentiostatic method. During the early phase of decay (t < 2 s), according to the Avrami kinetics-based film growth model, the transient current was separated into anodic dissolution (idiss) and film formation (ifilm) components and analyzed individually. The film reformation rate and thickness were compared according to applied potential. Anodic dissolution initially dominated the repassivation for a short time, and the amount of dissolution increased with increasing applied potential in the passive region. Film growth at higher potentials occurred more rapidly compared to at lower potentials. Increasing the applied potential from 0 VSCE to 0. 8 VSCE resulted in a thicker passive film (0. 12 to 0. 52 nm). If the oxide monolayer covered the entire bare surface (θ=1), the electric field strength through the thin passive film reached 1. 6 × 107 V/cm.

Polyhexamethylene Biguanide Functionalized Hyperbranched Polymers Enhance Their Antimicrobial Activities

Xu Meng,Bin Wang,Liping Liang,Bailing Liu 한국고분자학회 2017 폴리머 Vol.41 No.2

Hyperbranched antibacterials show much more potential performances than their small molecules due to unique structure. Polyhexamethylene biguanide (PHMB) functionalized hyperbranched poly(amide-PHMB)s (DPBs) were prepared and their antibacterial properties were investigated using several techniques. The results showed that Gram-positive organisms were more susceptible than Gram-negative bacteria for DPBs, N¹, N³, N<SUP>5</SUP>-tris(2-aminoethyl)benzene-1,3,5-tricarboxamide (DT) and PHMB. DPBs had better comprehensive properties than DT and PHMB, and the best one was DPB1. SEM and AFM were utilized to investigate the interactions between DPB1 and bacterial membranes of E. coli. The mode of action of DPB1 was revealed by the morphological images, which was consistent with bactericidal mechanism of cationic antibacterial agents.

Prototype of 6-DOF Magnetically Levitated Stage Based on Single Axis Lorentz force Actuator

Xu, Fengqiu,Xu, Xianze,Chen, Meng The Korean Institute of Electrical Engineers 2016 Journal of Electrical Engineering & Technology Vol.11 No.5

Importance of the Polymer Ligand Conformation to the 3D-Confined Co-Assembly of Nanoparticles with Block Copolymer Particles

( Meng Xu ),윤홍석,김범준 한국공업화학회 2022 한국공업화학회 연구논문 초록집 Vol.2022 No.1

Research on Brand Value Dimensions of Employers: Based on Online Reviews by the Employees

XU, Meng Korea Distribution Science Association 2022 The Journal of Asian Finance, Economics and Busine Vol.9 No.10

This study investigates employees' online reviews, conducts in-depth text topic mining, effectively summarizes the dimensions of employer brand value, and seeks effective ways to build employer brands from a multi-dimensional perspective. This study employs samples of employer reviews, filter keywords according to word frequency-inverse document frequency, builds a review network containing the same keywords, explore the community and summarize the theme dimensions. Simultaneously, it makes a dynamic comparison and analysis of the employer brand value dimension of different industries and enterprises. The study shows that the community exploration theme can be summarized into 11 dimensions of employer brand value, and the dimensions of employer brand value are significantly different across industries and among different enterprises within the industry. The attention to the employer brand value dimension has a significant time change. Various industries pay increasing attention to the dimension of work intensity and career development, while employers pay steady attention to the dimension of welfare benefits. The findings of this study suggest that seeking the heterogeneity of employer brand resources from the multi-dimensional differences and changes is an effective way to improve the competitiveness of enterprises in the human capital market.

Distinctions Between Clinicopathological Factors and Prognosis of Alpha-fetoprotein Negative and Positive Hepatocelluar Carcinoma Patients

Xu, Jia,Liu, Chang,Zhou, Lei,Tian, Feng,Tai, Ming-Hui,Wei, Ji-Chao,Qu, Kai,Meng, Fan-Di,Zhang, Ling-Qiang,Wang, Zhi-Xin,Zhang, Jing-Yao,Chang, Hu-Lin,Liu, Si-Nan,Xu, Xin-Shen,Song, Yan-Zhou,Liu, Jun,Z Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.2

Serum alpha-fetoprotein (AFP) is a significant marker for clinical diagnosis and prognosis evaluation in hepatocellular carcinoma (HCC) patients. However, some proportion of liver cancer patients are AFP-negative (AFP ${\leq}$20ng/ml). In order to study the differences between clinicopathological factors and prognosis of alpha-fetoprotein negative and positive patients, a total of 114 cases (41 AFP-negative and 73 AFP-positive) were selected for our research. By systematically statistical analysis, the results demonstrated that compared with AFP-negative patients, AFP-positive examples were more likely to feature cirrhosis nodules, non-complete neoplasm capsules, and a poor Edmondson-steiner grade. Furthermore, AFP-negative patients demonstrated a favorable long-term prognosis. By univariate analysis and multivariate analysis with Cox's proportional hazards model, multiple tumors were found to be independent risk factors for worse survival of AFP negative patients; however, less tumor-free margins, multiple tumors and Edmondson-steiner grades III/IV, proved to be independent risk factors leading to a poor prognosis of AFP positive cases. Finally, we can infer that high levels of AFP signify a highly malignant tumor and unfavorable prognosis.

Relationship between Immersion and Fun Perception of Leisure Sports Participants Leisure Attitude

Meng Xu,박순문 국제문화기술진흥원 2023 International Journal of Advanced Culture Technolo Vol.11 No.1

The purpose of this study is to identify the effects of leisure sports participants' leisure attitudes on immersion and fun perception. As of 2021, the subject of this study was set as a population of adult males and females aged 20 and over who participate in leisure sports in Gwangju and the South, and then the cluster random sampling method was used. A total of 300 people, 150 boys and 150 women, were collected. A questionnaire was used as a survey tool, and a questionnaire whose validity and reliability were recognized in previous studies was modified and secured according to this study. In addition, all questionnaires were constructed on a 5-point scale. The statistical analysis used for data analysis was frequency analysis, exploratory factor analysis, reliability analysis, and multiple regression analysis using SPSS Windows 21.0 Version. The conclusions obtained in this study through data analysis by such methods and procedures are as follows. First, it was found that leisure sports participants' leisure attitudes partially affect immersion. Second, leisure sports participants' leisure attitudes were found to have a partial effect on their perception of fun. Third, it was found that the immersion of leisure sports participants partially affects the perception of fun.

Economic Optimization Operation Approach of Integrated Energy System Considering Wind Power Consumption and Flexible Load Regulation

Meng Qinglin,Xu Jing,Ge Leijiao,Wang Zhongguan,Wang Jianxiao,Xu Liang,Tang Zhipeng 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.1

Due to the fuctuation of wind power output and the "heat to power" mode in the heating period, the wind abandonment phenomenon in coastal areas in winter is increasingly serious. From the perspective of integrated energy system in coastal areas, this paper frst builds an optimal operation model of integrated energy system in coastal areas with the minimum daily total operating cost and the minimum amount of abandoned wind, and constrains the output condition of the corresponding equipment. Then, the mechanism of the adjustable characteristics of seawater desalination load is analyzed, the adjustment range of seawater desalination load is calculated, and the integrated energy system optimization operation method in coastal areas is designed considering the desalination load. Finally, the winter scene of a coastal area in northern China is taken as an example to conduct simulation verifcation. The results show that the total daily operation cost of the system is reduced by 4.6% and the wind power consumption rate is increased by 2.87% after considering the load regulation efect of seawater desalination, which efectively verifes that the integrated energy system operation strategy designed plays a signifcant role in improving the system operation economy and promoting the consumption of new energy.

Expression of RECK and MMPs in Hepatoblastoma and Neuroblastoma and Comparative Analysis on the Tumor Metastasis

Xu, Meng,Wang, Hai-Feng,Zhang, Huan-Zhi Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.9

Objective: To explore the expression of RECK and relevant matrix metalloproteinases (MMPs) in hepatoblastoma (HB) and neuroblastoma (NB) and their clinical significance in the tumor metastasis. Materials and Methods: Forty-five wax-stone samples of HB and 43 wax-stone samples of NB removed by surgical resection and confirmed by pathology in Linyi Yishui Central Hospital were selected. According to presence and absence of metastasis, both NB and HB samples were divided into metastatic group and non-metastatic group, namely NB metastatic group (n=28), NB non-metastatic group (n=15), HB metastatic group (n=15) and HB non-metastatic group (n=30). The expression of RECK, membrane type-1 matrix metalloproteinase (MT1-MMP) in HB tissue and RECK, MMP-14 in NB tissue was detected using immunohistochemical method, and the correlation between RECK and MT1-MMP, MMP-14 was analyzed. Results: The metastatic rate of NB was dramatically higher than that of HB, with statistical significance (P=0.003). The positive rate of RECK expression in NB group (30.2%) was slightly lower than in HB group (40.0%), but no significant difference was presented (P=0.338). The positive rate of MMPs expression in NB metastatic group was evidently higher than in HB metastatic group (P=0.024). The results of Spearman correlation analysis revealed that the expression of RECK in HB and NB tissues had a significantly-negative correlation with MT1-MMP and MMP-14, respectively (r=-0.499, P=0.012; r=-0.636, P=0.000). Conclusions: In HB and NB tissues, RECK is expressed lowly, while relevant MMPs highly, and RECK inhibits the tumor invasion and metastasis through negative regulation of relevant MMPs.

The Hamburg Free Trade Zone as a Model for the Shanghai Pilot Free Trade Zone

XU, MENG 동아대학교 독일학연구소 2013 獨逸學硏究 Vol.- No.29

1990년 중국 첫 보세 구역 설립했다. 지금까지 보세 지역 경제 실력 끊임없이 쟁달하다. 국내와 해외 두 시장 및 자원을 연결하면서 외부 기업의 투자를 유치,수출을 확대, 고용을 강화하고 지역 경제 발전 등 방면에서 모두 중요한 역할을 발휘하였다. 세계 경제 일치화와 중국 대외 개방 산화따라 특히 중국이 WTO에 가입하는 후 중국 보세 구역 진일보한 발전을 준임한 도전에 직명해 있다. 이때는 보세구역은 자유 무역 지대도 변화된 것이다. 중국 신임 지도부의 상징이 되고 있다. 함부르크 FTA는 전 세계에서 가장 성공적이고 상징적인 자유 무역 지대 중 하나이다. 상하이와 함부르크 두 도시 상황에 대해 비교 및 분석따라 본문은 함부르크 일부 성공 경험이 총결할 것이다. 이 성공 경험이 중국 새로운 자유무역 지대의 참고 작용을 될 것이다.