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TA/SiO_(2)疏水涂层及其对混凝土抗侵蚀性能的影响

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建筑材料学报 2024年第1期27卷 30-36页

作者：来晓鹏王元战王禹迟孙煕平天津大学水利工程仿真与安全国家重点实验室天津300072 交通运输部天津水运工程科学研究所天津300456

基于贻贝仿生原理,成功制备了单宁酸(TA)/SiO_(2)疏水涂层,通过设置22组工艺组合,综合水接触角、电通量和表面微观结构,得到了涂层的最优制备工艺.针对最优制备工艺涂层,通过自然扩散试验研究了其对混凝土抗离子渗透性能的影响,并采用... 详细信息

基于贻贝仿生原理,成功制备了单宁酸(TA)/SiO_(2)疏水涂层,通过设置22组工艺组合,综合水接触角、电通量和表面微观结构,得到了涂层的最优制备工艺.针对最优制备工艺涂层,通过自然扩散试验研究了其对混凝土抗离子渗透性能的影响,并采用磨耗和酸碱腐蚀试验研究了涂层稳定性.结果表明,TA/SiO_(2)疏水涂层表面具有丰富的微纳米结构,水接触角达148.1°,至少能够减少75.31%的离子渗透进入混凝土,且稳定性优良.

关键词：疏水涂层混凝土离子渗透贻贝仿生

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碱渣土蠕变特性试验及数值模拟研究

土木工程学报 2024年第5期57卷 107-116页

作者：元捷衡王元战王轩陈艳萍龚晓龙陈通天津大学水利工程仿真与安全国家重点实验室天津300072 天津港(集团)有限公司天津300461

碱渣土孔隙比大、含水量高、压缩性大,研究其蠕变特性对于准确预测碱渣土地基长期沉降、确保上部结构长期稳定性具有重要意义。以天津港碱渣土为研究对象,采用分级加载-卸载的方式对不同深度处碱渣土进行一维压缩固结试验(包括卸荷回弹... 详细信息

碱渣土孔隙比大、含水量高、压缩性大,研究其蠕变特性对于准确预测碱渣土地基长期沉降、确保上部结构长期稳定性具有重要意义。以天津港碱渣土为研究对象,采用分级加载-卸载的方式对不同深度处碱渣土进行一维压缩固结试验(包括卸荷回弹与再压缩试验)。通过试样孔隙比随上部固结压力的变化曲线分析了碱渣土的压缩特性;利用“陈氏法”对分级加载过程的应变-时间试验数据进行处理,得到不同深度处碱渣土在不同固结压力下的应变-时间蠕变曲线。在此基础上,根据蠕变曲线衰减稳定规律以及应力-应变等时曲线所反映的非线性蠕变特征,提出采用Merchant元件模型对蠕变试验曲线进行拟合,并确定模型中3个参数的经验计算公式,建立碱渣土非线性蠕变模型。最后,通过编制有限元子程序实现数值开发,将数模计算值与蠕变试验数据、天津港碱渣土地基沉降实测值进行对比,验证所开发数值模型的合理性。

关键词：碱渣土蠕变特性 Merchant模型数值模拟

Computer Algebra and Solutions to the Karamoto-Sivashinsky Equation

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Communications in Theoretical Physics 2005年第1期43卷 39-44页

作者： XIEFu-Ding yuanzhan-Ting DepartmentofComputerScience，LanzhouUniversityofTechnology Lanzhou730050China／／KeyLaboratoryofMathematicsandMechanizationAcademyofMathematicsandSystemsSciencetheChineseAcademyofSciencesBeijing100080，China KeyLaboratoryofMathematicsandMechanization AcademyofMathematicsandSystemsSciencetheChineseAcademyofSciencesBeijing100080，China

The method of Riccati equation is extended for constructing travelling wave solutions of nonlinear partial differential equations. It is applied to solve the Karamoto-Sivashinsky equation and then its more new explicit solutions have been obtained. From the results given in this paper, one can see the computer algebra plays an important role in this procedure.

关键词： karamoto-sivashinsky equation computer algebra exact solution

An Approach to Stability Analysis of Embedded Large-Diameter Cylinder Quay

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China Ocean Engineering 2002年第3期17卷 383-393页

作者： WANG yuanzhan(王元战) ZHU Zhenyu(祝振宇) Department of Port and Coastal Engineering Tianjin University Tianjin 300072 China Department of Port and Coastal Engineering Tianjin University Tianjin 300072 China

The large-diameter cylinder structure, which is made of large successive bottomless cylinders placed on foundation bed or partly driven into soil, is a recently developed retaining structure in China. It can be used in port, coastal and offshore works. The method for stability analysis of the large-diameter cylinder structure, especially for stability analysis of the embedded large-diameter cylinder structure, is an important issue. In this paper, an idea is presented that is, embedded large-diameter cylinder quays can be divided into two types, i.e. the gravity wall type and the cylinder pile wall type. A method for stability analysis of the large-diameter cylinder quay of the cylinder pile wall type is developed and a method for stability analysis of the large-diameter cylinder quay of the gravity wall type is also proposed. The effect of significant parameters on the stability of the large-diameter cylinder quay of the cylinder pile wall type is investigated through numerical calculation.

关键词： large-diameter cylinder quay cylinder pile wall stability analysis

Strength Model of Soda Residue Soil Considering Consolidation Stress and Structural Influence

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中国海洋大学学报:英文版 2023年第5期22卷 1216-1226页

作者： GONG Xiaolong WANG yuanzhan CHEN Tong State Key Laboratory of Hydraulic Engineering Simulation and Safety and Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Tianjin UniversityTianjin 300354China Tianjin Port(Group)Co.Ltd. Tianjin 300461China Zhongnan Engineering Co.Ltd. Changsha 410014China

Soda residue(SR)is a type of industrial waste produced in the soda process with the ammonia-soda *** SR to backfilling solves the land occupation and environmental pollution problems in coastal areas and saves material costs for foundation *** strength characteristics of soda residue soil(SRS)under different consolidation conditions are the key points to be solved in the engineering application of *** compression tests were performed on the undisturbed SRS of Tianjin *** shear properties of SRS under different consolidation conditions were then ***,a structural strength model(SSM)based on Mohr-Coulomb theory was *** reflects the influence of soil structure on undrained strength(Cu)and divides the Cu into the following two parts:friction strength(C_(uf))and original structural strength(C_(u0)).C_(uf)characterizes the magnitude of friction between soil particles,which is related to the consolidation ***,C_(u0)represents the structural effect on soil strength,which is related to the soil deposition and consolidation *** was validated by the test data of undisturbed *** reveal that the undisturbed soil generally had a certain C_(u0).Therefore,the SRS strength model was established by combining the experimental law of SRS with *** analysis shows that the SRS strength model can effectively predict the Cu of undisturbed SRS in Tianjin Port under different consolidation conditions.

关键词： soda residue soil triaxial test strength model soil structure consolidation stress

Dynamic model of vibrating-sliding-uplift rocking coupled motion and dynamic design method of caisson breakwaters

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Science China(Technological Sciences) 2004年第3期47卷 352-365页

作者： WANG yuanzhan HUA Leina DONG Shaowei Department of Port & Coastal Engineering School of Civil Engineering Tianjin University Tianjin 300072 China Department of Port & Coastal Engineering School of Civil Engineering Tianjin University Tianjin 300072 China Department of Port & Coastal Engineering School of Civil Engineering Tianjin University Tianjin 300072 China

Vibrating, sliding and uplift rocking are three elementary motion types of caisson breakwaters. The dynamic model and the numerical simulation method of vibrating-sliding-uplift rocking coupled motion of caisson breakwaters are developed. The histories of displacement, rotation, sliding force and overturning moment of a caisson breakwater under the excitation of breaking wave impact are calculated for the motion models of vibrating, vibrating-sliding, vibrating-uplift rocking and vibrating-sliding-uplift rocking. The effects of various motion models on the stability of caisson breakwaters are investigated. The feasibility of the dynamic design idea that the sliding motion and the uplift rocking motion of caisson breakwaters are allowed under the excitation of breaking wave impact is discussed.

关键词： breakwater, dynamic design, vibrating-sliding-uplift rocking, coupled motion, stability.

Aptamer-Based Fluorescent Assay for Sensitive Detection of Cardiac Troponin Ⅰ

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Journal of Beijing Institute of Technology 2020年第1期29卷 45-51页

作者： Yu Li yuanzhan Yang Xuefei Lu Yulin Deng School of Life Science Beijing Institute of TechnologyBeijing 100081China

Acute myocardial infarction(AMI)is a major health problem leading to high rates of mortality and *** cardiac troponin I(cTnI)has shown high sensitivity and specificity towards AMI detection,and has been regarded as"gold standard".An ultrasensitive method to detectcTnI with low concentration in human fluid is *** this paper,we developed an aptamer-based assay coupled with rolling circle amplification(RCA)and molecular beacon probe for sensitive detection *** this strategy,aptamer acts as a bridge to communicate between oligonucleotides *** reaction produces a single-stranded tandem repeated copy of the circular template,which are recognized by fluorescence molecular beacon *** this strategy,highly sensitive and specific detection of cTnI was realized with the lowest detectable concentration of 7.24 pg/m *** developed aptamer-RCA assay can be a promising tool in clinical samples *** assay can also analyze other disease-related biomarkers by replacing the aptamer.

关键词： aptamer cardiac troponin I(cTnI) molecular beacon rolling circle amplification sensitive detection

Comparative Proteomics Based on 18O Labeling to Evaluate the Hepatotoxicity of Tris（2,3-dibromopropyl） Isocyanuratein Rats

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Journal of Beijing Institute of Technology 2019年第3期28卷 659-666页

作者： Yu Li Xuefei Lü yuanzhan Yang Yulin Deng School of Life Science Beijing Institute of Technology

Detecting protein expression levels in organisms exposed to environmental pollutants can help us understand the action mechanism of toxicity. In the present study, adult female Sprague-Dawley (SD) rats received a consecutive intraperitoneal injection of tris(2,3-dibromopropyl) isocyanurate (TBC) for seven days, and the ^16O/^18O labeling comparative proteomic approach was used to study the change of liver proteome in these rats. Thirty six differential proteins were identified between the control group and the high-dose-exposed group (8 mg/kg), of which, twenty eight proteins were down-regulated and eight proteins were up-regulated. Bioinformatics analysis revealed that most of the differential proteins were related with the metabolic and cellular processes. In addition, the contents of malondialdehyde (MDA), catalase (CAT), and glutathione (GSH) in liver were measured to evaluate the oxidative stress status induced by TBC exposure. Together, these findings showed that TBC might be toxic to liver by disrupting metabolic process and apoptosis. The results might provide a better insight into the mechanism of toxicity induced by TBC.

关键词： comparative proteomic hepatotoxicity ^18O labeling oxidative stress tris(2,3-dibromopropyl) isocyanurate (TBC)

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干湿循环对混凝土氯离子结合能力的影响研究

水道港口 2024年第3期45卷 415-425页

作者：王栋杜波王锦迪闫博宸王元战中国路桥工程有限责任公司北京100011 天津大学水利工程仿真与安全国家重点实验室天津300072

海洋环境下氯离子侵蚀是钢筋混凝土耐久性破坏的主要因素之一,目前普遍运用的基于Fick第二定律解析解的氯离子浓度预测方法是基于氯离子不与混凝土结合的假设。但在实际情况中,氯离子可以通过化学结合与物理吸附的方式与混凝土结合,混... 详细信息

海洋环境下氯离子侵蚀是钢筋混凝土耐久性破坏的主要因素之一,目前普遍运用的基于Fick第二定律解析解的氯离子浓度预测方法是基于氯离子不与混凝土结合的假设。但在实际情况中,氯离子可以通过化学结合与物理吸附的方式与混凝土结合,混凝土对氯离子的结合作用会降低自由氯离子浓度,从而降低氯离子扩散速率和钢筋前沿的氯离子浓度累积量。文章进行了8组不同干燥时间比和5个暴露时间点的干湿循环试验,研究干湿循环作用和暴露时间对混凝土氯离子结合能力的影响。分别采用线性吸附理论和Freundlich吸附理论对试验数据进行拟合分析,预测氯离子的结合能力。结果表明两种吸附理论表达出的氯离子结合能力均随着干燥时间比的增加而降低,但Freundlich吸附理论的预测结果更为准确,故选取该理论建立了干燥时间比、暴露时间影响下的氯离子结合能力表达式。根据建立的氯离子结合能力公式,建立合理描述氯离子传输特性的数值模型。并通过数值模拟比较考虑氯离子结合能力的氯离子传输模型与基于Fick第二定律解析解的氯离子扩散模型的差异。

关键词：混凝土干燥时间比氯离子结合能力预测模型