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Analysis of physical properties of gas hydrate-bearing unconsolidated sediment samples from the ultra-deepwater area in the South China Sea

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Frontiers in Energy 2022年第3期16卷 509-520页

作者： Xin Lyu Qingping Li Yang Ge Min Ouyang Hexing Liu Qiang Fu junlong zhu Shouwei Zhou China National Offshore Oil Corporation Research Institute Co.Ltd. Beijing 100028China State Key Laboratory of Natural Gas Hydrate Beijing100028China Zhanjiang Branch of China National Offshore Oil Corporation(CNOOC)Limited Zhanjiang524057China China National Offshore Oil Corporation(CNOOC) Beijing100021China

Marine natural gas hydrate has recently attracted global attention as a potential new clean energy source. Laboratory measurements of various physical properties of gas hydrate-bearing marine sediments can provide valuable information for developing efficient and safe extraction technology of natural gas hydrates. This study presents comprehensive measurement results and analysis of drilled hydrate-bearing sediments samples recovered from Qiongdongnan Basin in the South China Sea. The results show that the gas hydrate in the core samples is mainly methane hydrate with a methane content of approximately 95%, and the other components are ethane and carbon dioxide. The saturation of the samples fluctuates from 2%–60%, the porosity is approximately 38%–43%, and the water content is approximately 30%–50%, which indicate that high water saturation means that timely drainage should be paid attention to during hydrate extraction. In addition, the median diameter of the sediment samples is mainly distributed in the range of 15 to 34 µm, and attention should be paid to the prevention and control of sand production in the mining process. Moreover, the thermal conductivity is distributed in the range of 0.75 to 0.96 W/(m·K) as measured by the flat plate heat source method. The relatively low thermal conductivity of hydrates at this study site indicates that a combined approach is encouraged for natural gas production technologies. It is also found that clay flakes and fine particles are attached to the surface of large particles in large numbers. Such characteristics will lead to insufficient permeability during the production process.

关键词： natural gas hydrates physical properties analysis hydrate-bearing sediments

海上单桩基础风机土体阻尼校核与预测方法研究

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天津大学学报（自然科学与工程技术版） 2024年第2期57卷 165-173页

作者：苏凯朱洪泽周俊龙赖旭水资源工程与调度全国重点实验室(武汉大学) 武汉430072 武汉大学水工岩石力学教育部重点实验室武汉430072 海绵城市建设水系统科学湖北省重点实验室(武汉大学) 武汉430072 中国建筑第六工程局有限公司天津300171

对长期承受动荷载作用的海上风机而言,土体阻尼是影响其疲劳寿命的重要因素之一,不同学者对其考虑方式尚未统一,同时土体阻尼的输入和校核结果间存在一定差异.针对这一问题,本文以江苏黄海某风机工程项目为依托,在ABAQUS软件中建立单桩... 详细信息

对长期承受动荷载作用的海上风机而言,土体阻尼是影响其疲劳寿命的重要因素之一,不同学者对其考虑方式尚未统一,同时土体阻尼的输入和校核结果间存在一定差异.针对这一问题,本文以江苏黄海某风机工程项目为依托,在ABAQUS软件中建立单桩基础式海上风机有限元计算模型,设计了包含风机结构壁厚、基础埋深、结构密度及土体阻尼等因素的系列计算方案,采用自由振动分析对土体阻尼输入与校核间差异性进行系统研究,并设计正交试验采用极差分析方法进行各因素的影响权重分析,在此基础上基于多参数非线性回归分析提出了综合拟合公式,并给出相应土体校核阻尼预测方法.结果表明:风机土体阻尼校核结果远小于其输入值,仅为后者的2%~15%;校核阻尼与风机结构壁厚、结构密度呈正相关关系,与基础埋深呈负相关关系,但当基础埋深达到8倍桩径后,则基本不再影响校核结果;以上各因素并非线性独立,三者共同作用决定土体阻尼校核结果,其中结构壁厚影响最为显著,其次为结构密度,最后为基础埋深;本文提出的以结构壁厚与校核结果间幂函数为基础的拟合经验公式,其拟合精度良好,可有效模拟各因素与校核阻尼间的关系,同时可为同类型风机土体阻尼校核预测提供数学基础.

关键词：海上风机单桩基础式土体阻尼校核阻尼

Our expedition in the construction of fluorescent supramolecular metallacycles

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Chinese Chemical Letters 2019年第10期30卷 1767-1774页

作者： junlong zhu Xi Liu Junhai Huang Lin Xu Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular EngineeringEast China Normal UniversityShanghai 200062China Zhangjiang Institute China State Institute of Pharmaceutical IndustryShanghai 201203China State Key Laboratory of Fine Chemicals Dalian University of TechnologyDalian 116024China

During the past few years, the construction of fluorescent supramolecular metallocycles has attracted extensive attention due to their diverse applications such as sensing, photoelectric devices, and mimicking complicated natural photo-processes. In this review, we will discuss how we entered the field of fluorescent supramolecular metallacycles and what we investigated in this field. The preparation of various fluorescent supramolecular metallacycles and their applications in monitoring the dynamics of coordination-driven self-assembly, sensing, catalysts, and supramolecular gels will be summarized.

关键词： Supramolecular chemistry Fluorescent metallacycle Coordination-driven self-assembly Functionalized metallacycle Supramolecular gel

Key issues in development of offshore natural gas hydrate

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Frontiers in Energy 2020年第3期14卷 433-442页

作者： Shouwei ZHOU Qingping LI Xin LV Qiang FU junlong zhu State Key Laboratory of Natural Gas Hydrate CNOOC Research Institute Co.LtdBeijing 100028China Oil and Gas Reservoir Geology and Exploitation Chengdu 610500China

As a new clean energy resource in the 21st century,natural gas hydrate is considered as one of the most promising strategic resources in the future.This paper,based on the research progress in exploitation of natural gas hydrate(NGH)in China and the world,systematically reviewed and discussed the key issues in development of natural gas hydrate.From an exploitation point of view,it is recommended that the concepts of diagenetic hydrate and non-diagenetic hydrate be introduced.The main factors to be considered are whether diagenesis,stability of rock skeleton structure,particle size and cementation mode,thus NGHs are divided into 6 levels and used unused exploitation methods according to different types.The study of the description and quantitative characterization of abundance in hydrate enrichment zone,and looking for gas hydrate dessert areas with commercial exploitation value should be enhanced.The concept of dynamic permeability and characterization of the permeability of NGH by time-varying equations should be established.The‘Three-gas co-production’(natural gas hydrate,shallow gas,and conventional gas)may be an effective way to achieve early commercial exploitation.Although great progress has been made in the exploitation of natural gas hydrate,there still exist enormous challenges in basic theory research,production methods,and equipment and operation modes.Only through hard and persistent exploration and innovation can natural gas hydrate be truly commercially developed on a large scale and contribute to sustainable energy supply.

关键词： natural gas hydrate exploitation offshore diagenetic and non-diagenetic hydrate solid-state fluidization method dessert in enrichment area three-gas combined production on gas hydrate abundance

Fundamental characteristics of gas hydrate-bearing sediments in the Shenhu area, South China Sea

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Frontiers in Energy 2021年第2期15卷 367-373页

作者： Xin LYU Qingping LI Yang GE junlong zhu Shouwei ZHOU Qiang FU China National Offshore Oil Corporation Research Institute Co.Ltd Beijing 100028China State Key Laboratory of Natural Gas Hydrate Beijing100028China China National Offshore Oil Corporation Beijing 100021China

The basic physical properties of marine natural gas hydrate deposits are important to the understanding of seabed growth conditions, occurrence regularity, and occurrence environment of natural gas hydrates. A comprehensive analysis of the core samples of drilling pressure-holding hydrate deposits at a depth of 1310 m in the Shenhu area of the South China Sea was conducted. The experimental results indicate that the particle size in the hydrate sediment samples are mainly distributed in the range from 7.81 µm to 21.72 µm, and the average particle size decreases as the depth of the burial increases. The X-ray CT analytical images and surface characteristics SEM scan images suggest that the sediment is mostly silty clay. There are a large number of bioplastics in the sediment, and the crack inside the core may be areas of hydrate formation.

关键词： natural gas hydrate Shenhu area reservoirs characteristics

Small-molecule fluorescent probes for the detection of carbon dioxide

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Chinese Chemical Letters 2018年第10期29卷 1445-1450页

作者： junlong zhu Peipei Jia Nuo Li Shaoying Tan Junhai Huang Lin Xu Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular Engineering East China Normal UniversityShanghai 200062 China Zhangjiang Institute China State Institute of Pharmaceutical Industry Shanghai 201203 China

During the last few years, the preparation of novel fluorescent probes for the detection of carbon dioxide has attracted considerable attention since carbon dioxide plays extremely important roles in widespread fields including chemical, environmental, clinical analysis, and agri-food industry. This review focuses on the recent advances in the design principles, recognition mechanisms, and preparation of small-molecule fluorescent probes for the selective detection and monitoring of CO;. Moreover, their properties and functions will be discussed detailedly as well.

关键词： Fluorescent probe Carbon dioxide Design principle Sensing mechanism

扫描几何条件对多线激光雷达点云质量的影响分析

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测绘地理信息 2024年第3期49卷 35-40页

作者：余萌程军龙朱锋张小红武汉大学测绘学院湖北武汉430079

点云的几何精度、反射强度信息对于多线激光雷达(light detection and ranging,LiDAR)的实际应用有着重要的意义。针对扫描几何条件对点云质量的影响,本文构建了扫描距离、入射角度与多线激光雷达信号衰减的模型关系,从理论上分析了扫... 详细信息

点云的几何精度、反射强度信息对于多线激光雷达(light detection and ranging,LiDAR)的实际应用有着重要的意义。针对扫描几何条件对点云质量的影响,本文构建了扫描距离、入射角度与多线激光雷达信号衰减的模型关系,从理论上分析了扫描距离、入射角度对点云几何精度、反射强度的影响,提出了一种基于平面拟合的点云质量评估方法。在5~50 m的扫描距离、0°~60°的扫描入射角情况下,对3种多线激光雷达进行了测试。实验结果表明,随着扫描距离和入射角度的增加,多线激光雷达的测距中误差逐渐增加,点云反射强度准确性逐渐降低。

关键词：激光雷达距离入射角点云精度反射强度

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超磁致伸缩力传感执行器磁路优化设计与分析

传感器与微系统 2024年第1期43卷 115-119页

作者：王兴东朱俊龙鲁光涛武汉科技大学冶金装备及其控制教育部重点实验室湖北武汉430081 武汉科技大学机械传动与制造工程湖北省重点实验室湖北武汉430081

以超磁致伸缩力传感执行器为研究对象,基于磁致伸缩与涡流损耗理论,应用COMSOL有限元软件进行磁场分析,系统地研究了导磁体参数对磁通密度与涡流的影响规律。为增大磁通密度、减小涡流损耗,以超磁致伸缩棒中轴线上磁通密度均匀度为评价... 详细信息

以超磁致伸缩力传感执行器为研究对象,基于磁致伸缩与涡流损耗理论,应用COMSOL有限元软件进行磁场分析,系统地研究了导磁体参数对磁通密度与涡流的影响规律。为增大磁通密度、减小涡流损耗,以超磁致伸缩棒中轴线上磁通密度均匀度为评价标准,优化了导磁体参数,并将导磁体分区绝缘。静、动态磁场下与未优化时实验结果进行对比,结果表明:静磁场中优化后的磁通密度均值提升了0.0161T,均匀度提升了4.5%;动态磁场中,分区绝缘可有效减少涡流损耗,优化后的力传感器灵敏度提升了5.76%。

关键词：超磁致伸缩执行器涡流损耗磁路优化分区绝缘有限元仿真

Acid-induced tunable white light emission based on triphenylamine derivatives

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Chinese Chemical Letters 2021年第4期32卷 1537-1540页

作者： Xi Liu Yi Qin junlong zhu Xiaoli Zhao Tanyu Cheng Yanrong Jiang Haitao Sun Lin Xu Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular EngineeringEast China Normal UniversityShanghai 200062China Key Laboratory of Resource Chemistry of Ministry of Education.Shanghai Key Laboratory of Rare Earth Functional Materials.Shanghai Normal University Shanghai 200234China State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200062China State Key Laboratory of Fine Chemicals Dalian University of TechnologyDalian 116024China

A series of triphe nylamine(TPA)derivatives with various substituent groups were prepared and showed different absorption and fluorescence characteristics due to the substituent effect.On account of the existence of pyridine units,these TPA derivatives exhibited acid-induced tunable multicolor fluorescence emission including white light emission.In addition,acid-induced fluorescence regulation of these compounds has been also realized in the solid state,which enable them to be successfully constructed the stimuli-responsive fluorescent films and fluorescent inks for inkjet printing.

关键词： Triphenylamine Fluorescence regulation White light emission Substituent effect Intramolecular charge transfer