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Advances in functional coatings on biliary stents

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Regenerative Biomaterials 2024年第2期3卷 55-75页

作者： Kaining Yang Wenxin Sun Lanyue Cui Yuhong Zou Cuie Wen Rongchang zeng Department of Bioengineering College of Chemical and Biological EngineeringShandong University of Science and TechnologyQingdao 266590China Corrosion Laboratory for Light Metals College of Materials Science and EngineeringShandong University of Science and TechnologyQingdao 266590China school of Engineering RMIT UniversityMelbourneVIC3001Australia

Biliary stenting is an important interventional method for the prevention and treatment of biliary tract ***,complications,such as postoperative biliary infection and re-stenosis,frequently occur due to the extensive scope of the biliary system and the complex composition of *** com-bination of coating technology and biliary stents is expected to bring new approaches to the solution of these *** cutting-edge advance on functional coatings on biliary stents is reviewed from seven perspectives:anticorrosion,-bacterial,-tumor,stone-dissolving,X-ray visibility,anti-stent migration and functional composite *** de-velopment trend is also *** performance of the numerous functional coatings for various purposes is generally up to expectations,but the balance between the medica tions'effectiveness and their safety needs to be further *** contemporary investigations have advanced to the leve of animal experiments,offering crucial fundamental assurance for broader human *** combination of biliary stent and functional coatings is an innovative idea with great potential for future development.

关键词： biliary stent coating anticorrosion antibacterial antitumor stone-dissolving X-ray visibility antistent migration

Dopamine hydrochloride and carboxymethyl chitosan coatings for multifilament surgical suture and their influence on friction during sliding contact with skin substitute

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Friction 2020年第1期8卷 58-69页

作者： Gangqiang ZHANG Ganlin ZHENG Tianhui REN Xiangqiong zeng Emile van der HEIDE Advanced Lubricating Materials Laboratory Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201210China Institute of Functional Textiles and Advanced Materials Colloge of Textlies&ClothingQingdao UniversityQingdao 266000China School of Chemistry and Chemical Engineering Key Laboratory of Thin Film and Microfabrication Technology(Ministry of Education)Shanghai Jiao Tong UniversityShanghai 200240China Laboratory for Surface Technology and Tribology University of TwenteEnschede 7500AEThe Netherlands TU Delft Faculty of Civil Engineering and GeosciencesStevinweg 1Delft 2628 CNThe Netherlands Soete Laboratory Ghent UniversityZwijnaarde B-9052Belgiu

In order to reduce the damage to tissue and fill the interstices between fibers,multifilament sutures are frequently treated with certain coating *** objective of this study was to create and characterize dopamine hydrochloride(DA)and carboxymethyl chitosan(CMCS)coatings on surgical sutures and investigate their effects on the frictional performance of the surgical sutures during sliding through a skin *** effects of the treatment on the physical and chemical characteristics of the surgical sutures were *** friction force of the surgical sutures during sliding through the skin substitute was experimentally determined using a penetration friction *** coefficient of friction(COF)was calculated using a linear elastic model and was used to estimate the frictional behavior of the surgical suture‐skin *** results showed that the DA coating could evenly deposit on the surface of the etched multifilament surgical suture surfaces in a weakly alkaline buffer *** CMCS coating material could form a uniform film on the surface of the *** changes in the surface roughness of the multifilament surgical sutures with different treatments occurred in this *** friction force and the COF of the multifilament surgical sutures with DA and CMCS coating showed little change when compared with untreated multifilament surgical sutures.

关键词： friction surgical suture coating Biomaterials skin substitute

Analytical Determination of Interwell Connectivity Based on Interwell Influence

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Tsinghua Science and Technology 2021年第6期26卷 813-820页

作者： Jiangru Yuan Xingjie zeng Haiyun Wu Weishan Zhang Jiehan Zhou Bingyang Chen Research Institute of Petroleum Exploration and Development Beijing 100083China College of Computer Science and Technology China University of PetroleumQingdao 266580China Department of Computer and Electronic Engineering University of OuluOulu FI-90014Finland

Interwell connectivity, an important element in reservoir characterization, especially for water flooding,is used to make decisions for better oil production. The existing methods in literature directly use related data of wells to infer interwell connectivity, but they ignore the influence between different wells. The connection of one well to more than two wells(as is often true in the oil field well pattern) will impact the accuracy of the connectivity analysis. To address this challenge, this paper proposes the Particle Swarm Optimization-based CatBoost for Interwell Connectivity(PSOC4IC) based on relative features to analyze interwell connectivity with the combination of joint mutual information maximization-based denoising sparse autoencoder for inter-feature construction and extraction and PSO-based CatBoost(PSO-CatBoost) for connectivity prediction with high-dimensional noise *** experimental results show that the PSOC4IC improves analysis accuracy.

关键词： interwel connectivity interwel influence Particle Swarm Optimization(PSO) CatBoost

Geochemical and isotopic characteristics of volcanic rocks from the northern East China Sea shelf margin and the Okinawa Trough

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Acta Oceanologica Sinica 2010年第4期29卷 48-61页

作者： zeng Zhigang YU Shaoxiong WANG Xiaoyuan FU Yongtao YIN Xuebo ZHANG Guoliang WANG Xiaomei CHEN Shuai Seafloor Hydrothermal Activity Laboratory of the Key Laboratory of Marine Geology and Environment Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China Graduate School of Chinese Academy of Sciences Beijing 100049 China

Volcanic rocks both from the northern East China Sea （NECS） shelf margin and the northern Okinawa Trough are subalkaline less aluminous,and lower in High Field Strength Elements （HFSE）.These rocks are higher in Large Ion Lithophile Elements （LILE）,thorium and uranium contents,positive lead anomalies,negative Nb-Ta anomalies,and enrichment in Light Rare Earth Elements （LREE）.Basalts from the NECS shelf margin are akin to Indian Ocean Mid-Ocean Ridge Basalt （MORB）,and rhyolites from the northern Okinawa Trough have the highest 207 Pb/ 204 Pb and 208 Pb/ 204 Pb *** NECS shelf margin basalts have lower 87 Sr/ 86 Sr ratios,ε N d and σ 18 O than the northern Okinawa Trough silicic *** to 40 K– 40 Ar isotopic ages of basalts from the NECS shelf margin,rifting of the Okinawa Trough may have been active since at least 3.65–3.86 *** origin of the NECS shelf margin basalt can be explained by the interaction of melt derived from Indian Ocean MORB-like mantle with enriched subcontinental *** basalts from both sides of the Okinawa Trough may have a similar origin during the initial rifting of the Okinawa Trough,and the formation of basaltic magmas closely relates to the thinning of continental *** source of the formation of the northern Okinawa Trough silicic rocks was different from that of the middle Okinawa Trough,which could have been generated by the interaction of basaltic melt with an enriched crustal *** the Ryukyu island arc to East China,the Cenozoic basalts have apparently increasing trends of MgO contents and ratios of LREE to Heavy Rare Earth Elements （HREE）,suggesting that the trace element variabilities of basalts may have been influenced by the subduction of the Philippine Sea plate,and that the effects of subduction of the Philippine Sea plate on the chemical composition of basaltic melts have had a decreasing effect from the Ryukyu island arc to East China.

关键词： volcanic rocks geochemical characteristics northern East China Sea shelf margin Okinawa Trough

Adaptive fuzzy asymptotic control design for MIMO nonlinear systems with state constraints

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Journal of Control and Decision 2023年第4期10卷 610-623页

作者： Yongchao Liu Bowen zeng Qidan Zhu Lipeng Wang Institute of Complexity Science School of AutomationQingdao UniversityQingdaoPeople’s Republic of China Shandong Key Laboratory of Industrial Control Technology QingdaoPeople’s Republic of China College of Intelligent Systems Science and Engineering Harbin Engineering UniversityHarbinPeople’s Republic of China

This paper addresses the asymptotic control problem of uncertain multi-input and multi-output(MIMO)nonlinear *** considered MIMO systems contain unknown virtual control coefficients(UVCCs)and state *** Lyapunov function by associating with the lower bounds of UVCCs is presented to counteract the adverse effect deriving from *** state constraints are ensured by utilising the barrier Lyapunov ***,the asymptotic tracking controller is recursively constructed by combining the backstepping technique with fuzzy logic *** remarkable character of the designed controller is that the asymptotic tracking performance can be achieved by introducing some smooth functions into adaptive backstepping *** contrast to the existing results,the conditions on the UVCCs are ***,the new control design is illustrated by a practical example.

关键词： Asymptotic tracking control state constraints bound estimation method nonlinear systems

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后现代主义精神与魏晋玄学

山东师范大学学报（人文社会科学版） 2000年第5期45卷 102-107页

作者：曾艳兵青岛大学中文系山东青岛266071

:魏晋玄学以“无”为中心与后现代主义中心的消解既相接近 ,又相背离。后现代主义是在主客体长期尖锐对立之后 ,因为主体的消失其对立面的客体也随之消失 ,实现了主客体的同一 ;魏晋玄学消除天地万物的一切差异 ,实现了主客体的同一。... 详细信息

:魏晋玄学以“无”为中心与后现代主义中心的消解既相接近 ,又相背离。后现代主义是在主客体长期尖锐对立之后 ,因为主体的消失其对立面的客体也随之消失 ,实现了主客体的同一 ;魏晋玄学消除天地万物的一切差异 ,实现了主客体的同一。后现代主义消解了一切意义 ,使得语言成为纯粹的能指符号 ;魏晋玄学执着于终极意义。

关键词：无中心无主体消失无差别能指清谈

Study on the application of ultrasonic wave in the removal of microbiofouling on PMMA surface

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Biosurface and Biotribology 2021年第3期7卷 119-125页

作者： Liang Zheng Yufan zeng Yuefan Li Jing Zheng Institute of Oceanographic Instrumentation Shandong Provincial Key Laboratory of Marine Monitoring Instrument and Equipment TechnologyQilu University of Technology(Shandong Academy of Sciences)QingdaoChina Tribology Research Institute Key Laboratory of Advanced Technologies of MaterialsMinistry of EducationSouthwest Jiaotong UniversityChengduChina

Ultrasound has been used for antifouling on the surface of medical devices or food utensils,but it is rarely applied in marine anti-biofouling on underwater *** understand whether ultrasonic antifouling is suitable for underwater optical windows,the effect of ultrasonic conditions including frequency,power and duration on the removal of microbiofouling on the surface of polymethyl methacrylate(PMMA),a type of common optical material,was investigated in this study by three-factor and three-level orthogonal *** and after the ultrasonic treatment,both surface morphology and fouling degree of PMMA samples immersed in Escherichia coli suspension and seawater were characterized and quantified using laser scanning *** results showed that ultrasonic treatment can effectively remove microfouling from the PMMA surface under suitable *** technology has a great potential for the control of microfouling on the marine optical *** compared with power and duration,ultrasonic frequency has a more significant effect on antifouling efficacy of *** is useful for PMMA samples exposed to seawater within 2 days to conduct an antifouling treatment under the condition of an ultrasonic frequency of 20 kHz,ultrasonic power of 40 W,and ultrasonic duration of 7 min.

关键词： fouling surface underwater

现代海底热液沉积物的硫同位素组成及其地质意义

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海洋学报 2001年第3期23卷 48-56页

作者：曾志刚蒋富清秦蕴珊翟世奎中国科学院海洋研究所山东青岛266071 青岛海洋大学海洋地球科学学院山东青岛266003

共收集到现代海底热液沉积物的 1 2 6 4个硫同位素数据 ,结合我们对冲绳海槽Jade热液区和大西洋中脊TAG热液区中表层热液沉积物的硫同位素研究成果 ,对比分析了不同地质 -构造环境中海底热液沉积物的硫同位素组成特征及其硫源问题 .结... 详细信息

共收集到现代海底热液沉积物的 1 2 6 4个硫同位素数据 ,结合我们对冲绳海槽Jade热液区和大西洋中脊TAG热液区中表层热液沉积物的硫同位素研究成果 ,对比分析了不同地质 -构造环境中海底热液沉积物的硫同位素组成特征及其硫源问题 .结果表明 :(1 )现代海底热液沉积物中硫化物的硫同位素组成集中分布在 1‰～9‰之间 ,均值为 4 5‰ (n =1 0 42 ) ,而硫酸盐矿物的硫同位素组成主要分布在 1 9‰～ 2 4‰之间 ,均值为 2 1 3‰ (n =2 1 7) ;(2 )无论在洋中脊还是在弧后盆地扩张中心 ,无沉积物覆盖热液活动区中热液沉积物与有沉积物覆盖热液活动区相比 ,其硫同位素组成的分布范围相对狭窄 ;(3)各热液活动区中硫化物硫同位素组成的不同 ,反映出各自硫源的差异性 .无沉积物覆盖洋中脊中热液成因硫化物的硫主要来自玄武岩 ,部分来自海水 ,是玄武岩和海水硫酸盐中硫不同比例混合的结果 ,而在弧后盆地和有沉积物覆盖的洋中脊 ,除了火山岩以外 ,沉积物和有机质均可能为热液硫化物的形成提供硫 ;(4)现代海底热液沉积物硫同位素组成的变化和硫源的不同可能归因于海底热液体系中流体物理化学性质的变化、岩浆演化和构造 -地质背景的不同 .

关键词：现代海底热液沉积物硫同位素地质构造冲绳海槽沉积物有机质

EXTRACTION OF INTERNAL TIDE FROM CURRENT

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Journal of Hydrodynamics 2001年第3期13卷 138-142页

作者： Pan, zeng-Di Han, Chun-Ming Yu, Wei-Dong Key Lab. of Mar. Sci. and Numl. Mode First Inst. of Oceanography State Oceanic Administration Qingdao 266061 China

In order to extract the internal tidal current from the current data which is not measured from the sea surface to the bottom, a data processing method is developed. It is based on the fact that the internal wave currents above and below the sharp thermocline are inverse in direction. This method is a practical extension to that proposed by Shu (1985) that can be only used to quite ideal current data. The ADCP data collected on the South China Sea is then processed by this method. The internal tidal current is successfully extracted.

关键词： Data processing Thermal gradients Tides