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Wenyuan Jian,Zhengyu Jin,Jing Yang,Guozhe Meng,Hongfang Liu,Hongwei Liu 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.113 No.-
The anticorrosion and antibiofouling of marine engineering equipments have strong demands, especiallyfor antibiofouling. In this work, an in-situ growth layered double hydroxide (LDH) coating on aluminumalloys (AA) 7075 was prepared and then modified by sodium pyrithione (SPT) to increase the anticorrosionand antibiofouling performance. Results indicated that CoAl-LDHs and CoAl-LDHs-SPT coatings hadbeen successfully prepared according to TEM, XRD, XPS, Raman spectra, and SEM analysis results. The(0 1 2) plane of LDHs with a interplanar spacing of 0.26 nm was recognized from TEM images. The contentof SPT in CoAl-LDHs-SPT is 38.79 wt.%. Electrochemical impedance spectroscopy (EIS) and polarizationcurvies demonstrate that the corrosion resistance of AA 7075 was largely improved in the presence ofCoAl-LDHs and CoAl-LDHs-SPT coatings while the anticorrosion performance of CoAl-LDHs-SPT coatingwas better. The corrosion resistance of Co-Al LDHs-SPT coating increased by about two orders of magnitudecompared with the bare AA 7075. The surface analysis results show that only a few Pseudomonasaeruginosa and Spirulina cells attached to the CoAl-LDHs coating surface, and no biofouling cells wereobserved for the CoAl-LDHs-SPT coating. Co-Al LDHs-SPT coating possessed the best anticorrosion andantibiofouling properties due to the presence of SPT compared with the CoAl-LDHs coating.
Multistep Controllability Synthesis and Growth Mechanism of ZnO Nanopagoda for Schottky Diode Device
Yang Liu,Guishan Liu,Yongbing Wang,Wenyuan Gao,Hongshun Hao,Bopu Huang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.2
Ordered ZnO arrays with a peculiar nanostructure were synthesized by a multistep synthesis process. The first step was the preparation of ZnO seed to induce the formation of ZnO array via potentiostatic electrodeposition method using a typical three electrode set-up. The second step was fabricating ZnO array along seed by Chemical Bath Deposition. Structural analysis of ZnO was carried out with X-ray diffraction (XRD), which showed a hexagonal wurtzite structure, and the selected area electron diffraction (SAED) patterns indicated that nanocrystalline is a part of monocrystal. The scanning electron microscope (SEM) and transmission electron microscope (TEM) were used to study the microstructure, and showed a pagoda-like microstructure with a tiny top and large bottom, which had an average top diameter of exceeding 800 nm at seeddepositing time of 60 s, and then growth mechanisms are subsequently given a further explanation, viewed from kinetics and thermodynamics. In addition, the current–voltage curves of schottky diode devices with ZnO nanopagoda arrays revealed that ZnO films arrays along grown ZnO seed had a higher reverse saturation current than ZnO films grown without seed, which are 1.48 x 10-6 A and 1.32 x 10-8 A, respectively. The minimum turn-on voltage of the diode with ZnO seed deposited 60 s is 0.18 V, without seed is 0.52 V.
Complexity Comparison for Drinkers' and Normal People's EEG Using Wavelet Entropy
Jiufu Liu,Lei Gao,Zaihong Zhou,Haiyang Liu,Zhengqian Wang,Wenyuan Liu,Jianyong Zhou 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.8
This paper investigates the influence of alcohol on brain complexity. Considering electro-encephalogram (EEG) has the nonlinear dynamics characteristic of time-varying and non-stationary, we introduce the wavelet entropy (WE) analysis. We denoise EEG signal by using wavelet decomposition, then calculate the wavelet entropy of the denoised signal and analyze the nonlinear complexity. In 64 conductive poles experiments and in different stimulus experiments for FP2 electrode's EEG, the drinkers' EEG wavelet entropy is greater than normal people's. The wavelet entropy of every conductive pole of drinkers’ or normal persons’ is inconformity.
Wenyuan Wang,Yali Feng,Haoran Li,ShunLiang Liu,Jinrong Ju,Yi Yang,Ben Wang 대한환경공학회 2023 Environmental Engineering Research Vol.29 No.3
Chemical waste salt is a hazardous waste generated during chemical production, and it is crucial to complete the recycling of the waste salt in a practical way. In the case of waste salt recycling by rotary kiln pyrolysis carbonization, ringing affects the pyrolysis efficiency and process running, thus a study on waste salt ringing was conducted. The results showed that the particle size is the key to the ring formation in rotary kiln, and pyrolysis temperature, pyrolysis time and temperature distribution in the rotary kiln also affect the material discharge rate during pyrolysis of waste salt in the rotary kiln. Thermogravimetric analysis and SEM images revealed that the volatilization of organic matter in the material due to pyrolysis caused a decrease in the abrasion resistance of the waste salt particle, which was the factor behind the ringing during pyrolysis in the rotary kiln. This study may provide a reference for the implementation of similar waste salt pyrolysis carbonization processes.
Zhansheng Liu,Antong Jiang,Wenyuan Shao,Anshan Zhang,Xiuli Du 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.3
Cable force monitoring is an important step in cable truss structural health monitoring. Considering cost eff ectiveness, the accuracy and quality of safety assessments depend primarily on the usage of reasonable cable monitoring programs. Many monitoring methods have been proposed to design the cable truss structure. The emergence of artifi cial neural network (ANN) models has resulted in improved predictive abilities. In this study, an ANN-based model is used to estimate parameter changes in static and prestress loss tests during the construction of a cable truss. The fi nite element model data of 243 cases are analysed by ANSYS and MATLAB. Analysis results indicate the excellent prediction performance as well as high accuracy and generalization of the proposed ANN-based model. Furthermore, the successfully trained ANN-based model is used to predict new cases. As an alternative to fi nite element analysis and physical test, the proposed model can guide the static loading of the spoke cable truss structure and thus allow the safe usage of the structure during service.
Paridis Saponins Inhibiting Carcinoma Growth and Metastasis In Vitro and In Vivo
Shuli Man,Wenyuan Gao,Yanjun Zhang,Chaoyi Ma,Liu Yang,Yiwen Li 대한약학회 2011 Archives of Pharmacal Research Vol.34 No.1
Paris polyphylla Smith var. yunnanensis extracts, Rhizoma Paridis saponins (RPS) have been found to show strong antitumor activity. However, few studies have yet investigated pulmonary metastasis treatment with this herb. To detail the effective components in RPS and discuss the preliminary mechanism of antitumor effects in vivo and in vitro, a mixture isolated from RPS was investigated. The main constituents were identified as polyphyllin D, formosanin C, dioscin, Paris H, Paris VII and pennogennin 3-O-α-L-rhamnopyranosyl (1→4)-[β-L-rhamnopyranosyl (1→2)]-β-D-glucopyranoside. In our experiments, LA795 cells were exposed to the mixed compounds. Migration inhibition was evaluated by wound healing assay and migration assay in non-cytotoxic dose which was determined by MTT assay. The results demonstrated that the constituent in varying degrees inhibited the migration of the tumor cells in vitro. The mixture also showed antitumor effects on carcinoma in vivo. In conclusion, the mixture is a potent anticancer agent that elicits programmed cell death and inhibits the migration in murine lung adenocarcinoma, both in vitro and in vivo.
Transdermal Pain Palliative Agents Containing Chinese Medicinal Herbs
Jia, Wei,Gao, Wenyuan,Cui, Naiqiang,Tang, Lida,Liu, Victoria J.K.,Yang, Jianqin,Qiu, Yunpin,Su, Mingming,Yu, Xiaojia The Korean Society of Plant Biotechnology 2003 Plant molecular biology and biotechnology research Vol.5 No.1
The TCM (traditional Chinese medicine) transdermal plaster (also known as "cataplasma") are flexible adhesive patches used for treatment of any pain, resulted from arthritis, sprain and bruise, tendovaginitis, lumbar spine protrude, neuralgia, hyperosteogeny ache, abdominal discomfort and metastatic cancer, etc. This paper provides a review of the TCM transdermal agents for pain palliation and the preparation of these herbal patches.l patches.
Preparation and Characterization of Polyimide/Alumina Composite Films as Improved Solid Dielectrics
Xiaoping Cui,Guangming Zhu,Wenyuan Liu 한국고분자학회 2016 폴리머 Vol.40 No.4
Polyimide/alumina (PI/Al₂O₃) nanocomposite films were prepared by incorporating different nano-sized Al₂O₃ contents into PI which derived from pyromellitic dianhydride (PMDA) and a flexible diamine 4,4-bis(3-aminophenoxy) biphenyl (4,3-BAPOBP). The micromorphology, chemical structure, dielectric, mechanical properties and glass transition temperatures (Tg) of prepared films were investigated by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), LCR metry, electronic tensile testing and differential scanning calorimetry (DSC). SEM images show uniform distribution of Al₂O₃ nanoparticles in matrix. FTIR spectra indicate that Al₂O₃ nanoparticles are functionalized with γ-aminopropyl triethoxysilane (γ-APS) and the imidization was complete. XRD patterns reveal the peaks of PI/Al₂O₃ composite films were similar to those of Al₂O₃, indicating that the crystal structure of Al₂O₃ remains unchanged and stable after being doped into PI matrix. Meanwhile, the effects of additives on the dielectric and mechanical properties of composite films were also studied. The results show the dielectric constant and dielectric loss of hybrid materials increase with the addition of Al₂O₃ nanoparticles. The electrical breakdown strength and tensile strength of PI/Al₂O₃ can be markedly improved by the addition of appropriate amounts of Al₂O₃ to the PI matrix.