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Nonlinear Contact Between Pipeline's Outer Wall and Slip-on Buckle Arrestor's Inner Wall During Buckling Process

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Journal of Ocean University of China 2017年第1期16卷 42-48页

作者： ma Weilin LIU Jiande DONG Sheng ZHANG Xin ma xiaozhou College of Engineering Ocean University of China State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin University State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology

In order to theoretically study the buckle propagation of subsea pipelines with slip-on buckle arrestors, a two-dimensional ring model was set up to represent the pipeline and a nonlinear spring model was adopted to simulate the contact between pipeline's inner walls and between pipeline's outer wall and slip-on buckle arrestor's inner wall during buckle propagation. In addition, some reverse springs are added to prevent the wall of left and right sides separating from the inner wall of slip-on buckle arrestors. Considering large deformation kinematics relations and the elastic-plastic constitutive relation of material, balance equations were established with the principle of virtual work. The variation of external pressure with respect to the cross-sectional area of pipelines was analyzed, and the lower bound of the crossover pressure of slip-on buckle arrestors was calculated based on maxwell's energy balance method. By comparing the theoretical results with experiment and finite element numerical simulation, the theoretical method is proved to be correct and reliable.

关键词： subsea pipeline buckle propagation nonlinear contact slip-on buckle arrestor crossover pressure

妊娠合并艾滋病孕产妇住院分娩的护理及职业防护研究

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科技与健康 2024年第11期3卷 101-104页

作者：朱瑞玲贺小娜马小洲庆阳市人民医院传染科甘肃庆阳745000 甘肃省庆阳市庆城县莲池社区卫生服务中心中医科甘肃庆阳745000

分析妊娠合并艾滋病孕产妇住院分娩的护理措施和职业防护效果.选取2022年1月-2023年1月住院分娩的60例妊娠合并艾滋病孕产妇为研究对象,随机将其分为对照组和研究组两组,每组各30例.对照组孕产妇接受常规分娩护理,研究组孕产妇在常规护... 详细信息

分析妊娠合并艾滋病孕产妇住院分娩的护理措施和职业防护效果.选取2022年1月-2023年1月住院分娩的60例妊娠合并艾滋病孕产妇为研究对象,随机将其分为对照组和研究组两组,每组各30例.对照组孕产妇接受常规分娩护理,研究组孕产妇在常规护理基础上配合职业防护措施,对比两组孕产妇护理效果.结果显示,研究组孕产妇出现产后并发症、医源性感染和职业暴露的概率明显低于对照组,组间数据差异具有统计学意义(P<0.05).研究发现,完善妊娠合并艾滋病孕产妇的住院分娩护理工作及职业防护措施,可以显著降低其发生产后并发症、医源性感染、职业暴露的风险.

关键词：妊娠艾滋病孕产妇住院分娩护理

Improving the sensitivity for DNA sensing based on doubleanchored DNA modified gold nanoparticles

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Science China Chemistry 2016年第6期59卷 765-769页

作者： xiaozhou ma Miao Wang Chun Chen mark Antonin Isbell Rui Wang Dongsheng Liu Zhongqiang Yang Key Laboratory of Preclinical Study for New Drugs of Gansu Province State Key Laboratory of Applied Organic Chemistry and Institute of Biochemistry and Molecular BiologySchool of Basic Medical ScienceLanzhou UniversityLanzhou 730000China Key Laboratory of Organic Optoelectronics&Molecular Engineering of the Ministry of Education Department of ChemistryTsinghua UniversityBeijing 100084China Department of Chemistry and Chemical Biology Cornell UniversityIthaca 14850USA Department of Chemical Engineering Imperial College LondonLondon SW7 2AZUK

DNA modified nanoparticles(Au NPs) are an established and widely used type of nucleotide sensor. We sought to improve the design by applying short rigid DNA duplexes near the surface of the Au NPs forming a so called double-anchored Au NP sensor, and compared it with other conventional DNA modified Au NPs. The improved design exhibited higher assembly efficiency, and consequently increased its sensitivity to target DNA.

关键词： DNA gold nanoparticles single nucleotide polymorphisms (SNP) surface plasmon resonance sensing

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复杂波浪场中防波堤掩护效果的数值模拟研究

港口航道与近海工程 2024年第3期61卷 1-7页

作者：魏远明许彬彬项家窍马小舟中交第四航务工程局有限公司广东广州510230 中交四航局第二工程有限公司广东广州510230 大连理工大学海岸和近海工程国家重点实验室辽宁大连116024

防波堤的布局以及波浪的工况条件会使泊位处的波高发生变化,影响系泊船的安全作业。结合南美洲某港口工程,采用基于Boussinesq型方程的MIKE21-BW模型,分析了复杂波浪场中防波堤对泊位的掩护效果,研究不同走向及不同长度的防波堤的掩护... 详细信息

防波堤的布局以及波浪的工况条件会使泊位处的波高发生变化,影响系泊船的安全作业。结合南美洲某港口工程,采用基于Boussinesq型方程的MIKE21-BW模型,分析了复杂波浪场中防波堤对泊位的掩护效果,研究不同走向及不同长度的防波堤的掩护性能。结果表明,防波堤布局1在复杂波浪场中具有良好的掩护效果,各种工况中的有效波高均满足短波的波高限制,可以保证船舶的稳泊。但是防波堤布局1并不能对其有效地消解次重力波,随着波浪周期的增大,部分泊位处的次重力波高大于限制标准,可能会存在泊稳问题。布局2的掩护效果欠佳,无法满足限制标准。布局3的掩护效果有了显著的提升,泊位处的有效波高和次重力波高均得到了进一步的消解。研究成果为港口布局、系泊设计和港工建造提供了参考。

关键词：防波堤涌浪次重力波数值模拟 Boussinesq方程

中长周期波作用下系泊集装箱船水动力响应数值模拟

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水运工程 2024年第7期 11-17页

作者：严明宇马小舟郑振钧董国海王潇晨大连理工大学海岸和近海工程国家重点实验室辽宁大连116024

海外港口建设的海域中,显著的中长周期波浪给系泊船的稳定性带来一定影响。基于波浪周期的变化开展系泊船水动力响应的数值模拟研究,并考虑船舶在系泊过程中可能遇到的不同装载状态和不同系泊布置情况。利用系泊分析模型MIKE21 maritim... 详细信息

海外港口建设的海域中,显著的中长周期波浪给系泊船的稳定性带来一定影响。基于波浪周期的变化开展系泊船水动力响应的数值模拟研究,并考虑船舶在系泊过程中可能遇到的不同装载状态和不同系泊布置情况。利用系泊分析模型MIKE21 maritime进行验证和分析。结果表明,系泊船的水动力响应主要受到波浪周期的影响,特别是纵荡和横荡运动;横荡运动受系泊布置方式的影响较为明显,横摇运动受装载状态的影响最为明显;相较其他缆绳而言,系泊船的横缆系缆力对入射波浪谱峰周期的变化最为敏感。

关键词：波浪周期模型验证系泊船水动力响应

Surface Chemical Modification of Cellulose Nanocrystals and Its Application in Biomaterials

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Paper And Biomaterials 2017年第4期2卷 34-57页

作者： xiaozhou ma YanJie Zhang Jin Huang School of Chemistry and Chemical Engineering Joint International Research Laboratory of Biomass-Based Macromolecular Chemistry and MaterialsSouthwest University School of Chemistry Chemical Engineering and Life SciencesWuhan University of Technology

Cellulose nanocrystals(CNCs) have been widely applied in biomaterials and show great biocompatibility and mechanical strength. In this review, the chemical reactions applied in CNC surface modification and their application in CNC based biomaterials are introduced. Furthermore, the conjugation of different functional molecules and nanostructures to the surface of CNCs are discussed, with focus on the binding modes, reaction conditions, and reaction mechanisms. With this introduction, we hope to provide a clear view of the strategies for surface modification of CNCs and their application in biomaterials, thus providing an overall picture of promising CNC-based biomaterials and their production.

关键词： cellulose nanocrystals chemical modification immobilization biomaterials application

Facile Fabrication of Conductive Paper-based materials from Tunicate Cellulose Nanocrystals and Polydopamine-decorated Graphene Oxide

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Paper And Biomaterials 2018年第4期3卷 19-25页

作者： xiaozhou ma YaoYao Chen Peter R. Chang Jin Huang School of Chemistry and Chemical Engineering Joint International Research Laboratory of Bio-mass-Based Macromolecular Chemistry and Materials Southwest University Chongqing 400715 China School of Chemistry Chemical Engineering and Life Sciences Wuhan University of Technology Wuhan Hubei Province 430070 China Bioproducts and Bioprocesses National Science Program Agriculture and Agri-Food Canada 107 Science Place Saskatoon SK S7N 0X2 Canada

Conductive papers made from graphene and its derivatives are important for the development of electronic devices; however, elastomer-based matrices usually make it difficult for the conductive sheets to form continuous conductive networks. In this work, we used tunicate-derived cellulose nanocrystals （TCNC） instead of traditional elastomers as the matrix for polydopamine （PDA）-coated and reduced graphene oxide （GO） to prepare conductive paper, which, at a low concentration, were better for the formation of conductive networks from conductive sheets. It was found that the Young’s modulus of the conductive paper produced via this strategy reached as high as 7 GPa. Meanwhile, owing to the partial reduction of GO during the polymerization of dopamine, the conductivity of the conductive paper reached as high as 1.3×10-5 S/cm when the PDA-coated GO content was 1 wt%, which was much higher than the conductivity of pure GO （-4.60×10-8 S/cm）. This work provides a new strategy for preparing environmentally friendly conductive papers with good mechanical properties and low conductive fller content, which may be used to produce high-performance, low-cost electronic devices.

关键词： conductive paper tunicate cellulose nanocrystal graphene oxide polydopamine coating casting paper

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基于最大差异选择算法的代表性海况选取

水运工程 2024年第1期 1-7页

作者：王潇晨郑振钧董华韦李鹏达吴宇飞郑艳娜马小舟董国海大连理工大学海岸和近海工程国家重点实验室辽宁大连116024 深圳大学广东省滨海土木工程耐久性重点实验室广东深圳518060 大连海洋大学海洋与土木工程学院辽宁大连116023

数值模拟及物理模型试验是研究近岸波浪的重要方法。在实施数值模拟和物理模型试验前,需要根据近岸波浪特征确定入射波浪要素。近岸波浪往往是由混合浪主导的,包含多个独立的波浪系统,每个波系都需用多个波浪特征参数进行描述,因此实现... 详细信息

数值模拟及物理模型试验是研究近岸波浪的重要方法。在实施数值模拟和物理模型试验前,需要根据近岸波浪特征确定入射波浪要素。近岸波浪往往是由混合浪主导的,包含多个独立的波浪系统,每个波系都需用多个波浪特征参数进行描述,因此实现多波浪系统的代表性海况的选取具有重要意义。首先介绍了数据挖掘算法,随后根据汉班托塔港的实测波浪数据,运用最大差异选择算法(MDA)分别选取了二维、三维以及多维特征参数描述下的代表性波浪条件。结果表明,对于可进行人为筛选的二维波浪特征参数,MDA算法的筛选结果优于人工筛选结果。在三维及多维波浪特征参数条件下,MDA算法选取的代表性海况在数据空间上分布均匀,具有较高的代表性,证实了MDA算法适用于选取混合海况下的代表性波浪特征参数。

关键词：最大差异选择算法波浪观测代表性海况混合浪多波浪系统

Review of Cellulose Nanocrystal-based Fluorophore materials and Their Application in Metal Ion Detection

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Paper And Biomaterials 2018年第4期3卷 45-61页

作者： Ya Wang Alain Dufresne Peter R. Chang xiaozhou ma Jin Huang School of Chemistry and Chemical Engineering Joint International Research Laboratory of Biomass-Based Macromolecular Chemistry and Materials Southwest University Chongqing 400715 China Université Grenoble Alpes CNRS Grenoble INP LGP2 F-38000 Grenoble France Bioproducts and Bioprocesses National Science Program Agriculture and Agri-Food Canada 107 Science Place Saskatoon SK S7N0X2 Canada

Cellulose nanocrystals （CNCs）, a unique and promising natural material extracted from native cellulose, have attracted considerable attention owing to their physical properties and special surface chemistry. This review focuses on chemical conjugation strategies that can be used for preparation of ？uorescent-molecule labeled CNCs and the development of biomaterials. Furthermore, their application in the detection of metal ions and future development prospects are discussed. We hope to provide a clear view of the strategies for surface fluorescent modifcation of CNCs and their application in detection of metal ions.

关键词： fluorescent cellulose nanocrystals detection of metal ions sensors optical imaging biomaterial