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Buckling response of offshore pipelines under combined tension, bending, and external pressure

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第8期12卷 627-636页

作者： Shun-feng gong lin yuan Wei-liang JIN Institute of Structural Engineering Zhejiang University Hangzhou 310058 China

The buckle and collapse of offshore pipeline subjected to combined actions of tension, bending, and external pressure during deepwater installation has drawn a great deal of attention. Extended from the model initially proposed by Kyriakides and his co-workers, a 2D theoretical model which can successfully account for the case of simultaneous tension, bending, and external pressure is further developed. To confirm the accuracy of this theoretical method, numerical simulations are conducted using a 3D finite element model within the framework of ABAQUS. Excellent agreement between the results validates the effectiveness of this theoretical method. The model is then used to study the effects of several important factors such as load path, material prop-erties, and diameter-to-thickness ratio, etc., on buckling behaviors of the pipes. Based upon parametric studies, a few significant conclusions are drawn, which aims to provide the design guidelines for deepwater pipeline with solid theoretical basis.

关键词： Deepwater Offshore pipeline Buckle External pressure

A Hybrid Conjugate Gradient Algorithm for Nonconvex Functions and Its Applications in Image Restoration Problems

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Journal of the Operations Research Society of China 2023年第4期11卷 759-781页

作者： gong-lin yuan Ying-Jie Zhou Meng-Xiang Zhang College of Mathematics and Information Science Center for Applied Mathematics of GuangxiGuangxi UniversityNanning530004China

It is prominent that conjugate gradient method is a high-efficient solution way for large-scale optimization ***,most of the conjugate gradient methods do not have sufficient descent *** this paper,without any line search,the presented method can generate sufficient descent directions and trust region *** use some suitable conditions,the global convergence of the method is established with Armijo line ***,we study the proposed method for solving nonsmooth problems and establish its global *** experiments show that the presented method can be applied to solve smooth and nonsmooth unconstrained problems,image restoration problems and Muskingum model successfully.

关键词： Conjugate gradient Smooth and nonsmooth problems Nonconvex functions Global convergence

A nonmonotone adaptive trust-region algorithm for symmetric nonlinear equations

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Natural Science 2010年第4期2卷 373-378页

作者： gong-lin yuan Cui-ling Chen Zeng-Xin Wei 不详

In this paper, we propose a nonmonotone adap-tive trust-region method for solving symmetric nonlinear equations problems. The convergent result of the presented method will be estab-lished under favorable conditions. ... 详细信息

关键词： Trust Region Method Global Con-vergence Symmetric Nonlinear Equations

One-step Synthesis of Singly Bridged Biscalix[4]arenes

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One-step Synthesis of Singly Bridged Biscalix[4]arenes

Recent progress on photoactive nonprecious transition-metal complexes

中国化学会全国第十三届大环化学暨第五届超分子化学学术讨论会

作者： Zheng Qin gong Shu-ling gong lin-Bo Chen yuan-Yin (Department of Chemistry, Wuhan University, Wuhan, 430072)

Biscalixarenes are the type of host molecules consisting of two calixarene moieties linked at their upper or lower rim through various spacers in supramolecular chemistry. They are examples of higher-order molecular architectures with new high-level host properties such as cooperative action, allosteric effects, stronger inclusion ability and higher selectivity for the guest molecules and so on. Among them, singly bridged biscalixarene was a special kind one and received less attention.

关键词： biscalixarene singly bridged one-step synthesis

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Science China Chemistry 2025年第1期 46-95页

作者： Zhong-Liang gong Hong-Jie Zhang Yan Cheng Jianxun Liu Yuhan Ai Yaqin Li Zhihui Feng Qiong Zhang Shaolong gong Yong Chen Chang-Jiang Yao yuan-yuan Zhu Liang-Jin Xu Yu-Wu Zhong CAS Key Laboratory of Photochemistry Institute of Chemistry Chinese Academy of Sciences State Key Laboratory of Structural Cemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences School of Chemistry and Chemical Engineering Anhui Key Laboratory of Advanced Catalytic Materials and Reaction EngineeringHefei University of Technology State Key Laboratory of Explosion Science and Safety Protection School of Mechatronical Engineering Beijing Institute of Technology College of Chemistry and Molecular Sciences Hubei Key Lab on Organic and Polymeric Optoelectronic Materials Wuhan University School of Chemistry and Chemical Engineering Anhui University Key Laboratory of Photochemical Conversion and Optoelectronic Materials & CAS-HKU Joint Laboratory on New Materials Technical Institute of Physics and Chemistry Chinese Academy of Sciences

Photoactive complexes of nonprecious transition metals, mainly including those in the first-row and partially the second-row of the Periodic table of elements, have received increasing attention in view of their low cost and long-term sustainability. They are recognized as promising alternatives to noble transition metal complex congeners that have been extensively studied in optoelectronic devices, artificial photosynthesis, photocatalysis, biodiagnostics, and therapeutics, etc. This review is devoted to a comprehensive summary on the classical and recent advances on photoactive nonprecious transition metal complexes, including photoactive Zr, V, Cr, Mo, and W complexes, Mn complexes and hybrids, Fe, Co, Ni, and Cu complexes, and Zn and Cd complexes and hybrids. A particular focus is given on the molecular design, modulation of photophysical and photochemical properties, and applications of the representative and lately-developed nonprecious metal complexes. In addition, a perspective on the future development in this field is provided at the end of this review.

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不同踝关节外侧韧带重建术的有限元比较

中国矫形外科杂志 2020年第10期28卷 920-924页

作者：龚远林张晓林曾吉祥王健达州职业技术学院临床医学系四川达州635001 成都医学院第二附属医院核工业四一六医院四川成都610000

[目的]通过有限元分析的方法研究不同踝关节外侧韧带重建术对踝关节稳定状态的影响。[方法]选取1例32岁健康男性志愿者的踝关节三维CT数据,构建骨骼的实体模型。设计正常对照模型、单韧带重建模型、Y形重建模型、双隧道重建模型。网格... 详细信息

[目的]通过有限元分析的方法研究不同踝关节外侧韧带重建术对踝关节稳定状态的影响。[方法]选取1例32岁健康男性志愿者的踝关节三维CT数据,构建骨骼的实体模型。设计正常对照模型、单韧带重建模型、Y形重建模型、双隧道重建模型。网格划分、定义材料力学属性及接触关系。在踝关节中立位、跖屈20°、背伸10°三种状态添加150 N牵引力模拟前抽屉试验,1.7 N·m内旋扭矩模拟跟骨内翻试验。[结果]ATFL的Von Mises应力在中立位和跖屈20°位距,4个模型间差异无统计学意义(P>0.05),但背伸10°位单韧带重建模型和双隧道重建模型的Von Mises应力显著小于对照模型和Y形重建模型,差异有统计学意义(P0.05)。在前抽屉应力下,距骨的前移距离在中立位和跖屈20°位,4模型之间差异无统计学意义(P>0.05),而在背伸10°位,Y形重建模型和对照模型均显著小于单韧带重建模型和双隧道重建模型(P0.05)。[结论]双隧道和Y形重建踝关节外侧复合体的稳定性优于单纯重建距腓前韧带,而Y形重建作为一种功能解剖重建优于双隧道重建。

关键词：慢性踝关节外侧不稳定解剖重建韧带有限元分析

Solar flare forecasting based on a Fusion Model

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Earth and Planetary Physics 2025年第1期9卷 171-181页

作者： YiYang Li ShiYong Huang SiBo Xu ZhiGang yuan Kui Jiang QiYang Xiong RenTong lin School of Earth and Space Science Technology Hubei Luojia LaboratoryWuhan UniversityWuhan 430072China

Solar flare prediction is an important subject in the field of space *** learning technology has greatly promoted the development of this *** this study,we propose a novel solar flare forecasting model integrating Deep Residual Network(ResNet)and Support Vector Machine(SVM)for both≥C-class(C,M,and X classes)and≥M-class(M and X classes)*** collected samples of magnetograms from May 1,2010 to September 13,2018 from Space-weather Helioseismic and Magnetic Imager(HMI)Active Region Patches and then used a cross-validation method to obtain seven independent data *** then utilized five metrics to evaluate our fusion model,based on intermediate-output extracted by ResNet and SVM using the Gaussian kernel *** results show that the primary metric true skill statistics(TSS)achieves a value of 0.708±0.027 for≥C-class prediction,and of 0.758±0.042 for≥M-class prediction;these values indicate that our approach performs significantly better than those of previous *** metrics of our fusion model’s performance on the seven datasets indicate that the model is quite stable and robust,suggesting that fusion models that integrate an excellent baseline network with SVM can achieve improved performance in solar flare ***,we also discuss the performance impact of architectural innovation in our fusion model.

关键词： solar flare pace weather deep learning Fusion Model

“Zero‑Strain” NiNb_(2)O_(6) Fibers for All‑Climate Lithium Storage

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Nano-Micro Letters 2025年第1期17卷 348-360页

作者： Yan Zhao Qiang yuan Liting Yang Guisheng Liang Yifeng Cheng Limin Wu Chunfu lin Renchao Che College of Physics Donghua UniversityShanghai 201620People’s Republic of China School of Materials Science and Engineering Institute of Materials for Energy and EnvironmentQingdao UniversityQingdao 266071People’s Republic of China Laboratory of Advanced Materials Shanghai Key Laboratory of Molecular Catalysis and Innovative MaterialsAcademy for Engineering&TechnologyFudan UniversityShanghai 200438People’s Republic of China Zhejiang Laboratory Hangzhou 311100People’s Republic of China Inner Mongolia University Hohhot 010021People’s Republic of China

Niobates are promising all-climate Li^(+)-storage anode material due to their fast charge transport,large specific capacities,and resistance to electrolyte ***,their moderate unit-cellvolume expansion(generally 5%–10%)during Li^(+)storage causes unsatisfactory long-term ***,“zero-strain”NiNb_(2)O_(6) fibers are explored as a new anode material with comprehensively good electrochemical *** Li^(+)storage,the expansion of electrochemical inactive NiO_(6) octahedra almost fully offsets the shrinkage of active NbO_(6) octahedra through reversible O *** superior volume-accommodation capability of the NiO_(6) layers guarantees the“zero-strain”behavior of NiNb_(2)O_(6) in a broad temperature range(0.53%//0.51%//0.74%at 25//−10//60℃),leading to the excellent cyclability of the NiNb_(2)O_(6) fibers(92.8%//99.2%//91.1%capacity retention after 1000//2000//1000 cycles at 10C and 25//−10//60℃).This NiNb_(2)O_(6) material further exhibits a large reversible capacity(300//184//318 mAh g−1 at 0.1C and 25//−10//60℃)and outstanding rate performance(10 to 0.5C capacity percentage of 64.3%//50.0%//65.4%at 25//−10//60℃).Therefore,the NiNb_(2)O_(6) fibers are especially suitable for large-capacity,fast-charging,long-life,and all-climate lithium-ion batteries.

关键词： NiNb_(2)O_(6)porous fiber “Zero-strain”mechanism Electrochemical property Harsh-temperature operation Operando characterization

Locally Enhanced Flow and Electric Fields Through a Tip Effect for Efficient Flow‑Electrode Capacitive Deionization

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Nano-Micro Letters 2025年第2期17卷 1-17页

作者： Ziquan Wang Xiangfeng Chen yuan Zhang Jie Ma Zhiqun lin Amor Abdelkader Maria‑Magdalena Titirici Libo Deng College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060People’s Republic of China Research Center for Environmental Functional Materials College of Environmental Science and EngineeringTongji University1239 Siping RoadShanghai 200092People’s Republic of China Department of Chemical and Biomolecular Engineering National University of SingaporeSingapore 117585Singapore Department of Engineering Faculty of Science and TechnologyBournemouth UniversityTalbot CampusFern BarrowPooleEngland BH125BBUK Institut de Chimie de Nice UniversitéCôte d’AzurUMR CNRS 727228 Av.Valrose06108 NiceFrance Department of Chemical Engineering Imperial College LondonSouth Kensington CampusExhibition RdLondon SW72AZUK

Low-electrode capacitive deionization(FCDI)is an emerging desalination technology with great potential for removal and/or recycling ions from a range of ***,it still suffers from inefficient charge transfer and ion transport kinetics due to weak turbulence and low electric intensity in flow electrodes,both restricted by the current ***,a new tip-array current collector(designated as T-CC)was developed to replace the conventional planar current collectors,which intensifies both the charge transfer and ion transport *** effects of tip arrays on flow and electric fields were studied by both computational simulations and electrochemical impedance spectroscopy,which revealed the reduction of ion transport barrier,charge transport barrier and internal *** the voltage increased from 1.0 to 1.5 and 2.0 V,the T-CC-based FCDI system(T-FCDI)exhibited average salt removal rates(ASRR)of 0.18,0.50,and 0.89μmol cm^(-2) min^(-1),respectively,which are 1.82,2.65,and 2.48 folds higher than that of the conventional serpentine current collectors,and 1.48,1.67,and 1.49 folds higher than that of the planar current ***,with the solid content in flow electrodes increased from 1 to 5 wt%,the ASRR for T-FCDI increased from 0.29 to 0.50μmol cm^(-2) min^(-1),which are 1.70 and 1.67 folds higher than that of the planar current ***,a salt removal efficiency of 99.89%was achieved with T-FCDI and the charge efficiency remained above 95%after 24 h of operation,thus showing its superior long-term stability.

关键词： Flow-electrode Capacitive deionization Current collector Tip effect Desalination