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Parameter sensitivity analysis of the axial stability for a marine flexible pipe

PETROLEUM 2024年第3期10卷 548-556页

作者： Tang, Liping zou, Jiaxin Song, Kenan Shi, Yongheng Liu, Li Southwest Petr Univ Sch Mechatron Engn Chengdu 610500 Peoples R China Univ Aberdeen Sch Engn Aberdeen AB24 3UE Scotland Natl Petr & Nat Gas Pipeline Network Grp Co Ltd Oil & Gas Control Ctr Beijing 100020 Peoples R China

Marine unbonded flexible pipes serve as the most essential equipment in offshore oil and gas exploration and exploitation. Axial compressive loads during installation or in service in the complex marine environment usually lead to buckling failure. A flexible pipe is a composite structure with multiple functional layers, of which the tensile armor layer plays a key role with regard to the response of the pipe subjected to axial loads. In this paper, a simplified three-dimensional finite element model is developed, focusing on the tensile layer and replacing the carcass layer, pressure sheath layer, and pressure armor layer by a cylindrical rigid body to reduce computational expense. By using this model, the buckling failure modes of the tensile armor layer (in particular the birdcaging phenomenon) are analyzed. Several key parameters that affect the stability of the flexible pipe under axial compression and torsion are emphasized, and their effects on its axial and torsional stiffness are compared and discussed. The results show that both the lay angle of the steel wires and the interlayer friction coefficient have a significant influence on the axial and torsional stiffness of the pipe, whereas the damaged length of the outer sheath has virtually no effect. (c) 2023 Southwest Petroleum University. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license (http:// ***/licenses/by-nc-nd/4.0/).

关键词： Flexible pipe Tensile armor Buckling failure Key parameters Stiffness LATERAL BUCKLING FAILURE TENSILE ARMOR PREDICTION MODES WIRES

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Finite Element Simulation and Experimental Study on Vibration Characteristics of Converter Transformer Under DC Bias

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Protection and Control of Modern Power Systems 2024年第4期9卷 110-125页

作者： Hao Wang Li Zhang Youliang Sun Liang zou the School of Electrical Engineering Shandong Uni-versityJinan 250061China the School of Electrical Engineering Shandong UniversityJinan 250061China Shandong Power Equipment Co. Ltd.Jinan 250101China

To clarify the electromagnetic,vibration,and loss characteristics of the internal components of a converter transformer under DC bias conditions and their influencing mechanisms,a series of studies are conducted using the finite element method and model *** paper quantifies the influence of different DC contents on the magnetic flux density,force,and displacement distribution characteristics of the iron core and winding and analyzes the internal relationship between various *** inflection point of the DC bias coefficient on the vibration is obtained and the contribution mechanism of the different responses of the iron core and winding to this inflection point is *** value of the DC bias coefficient for changing the main vibration frequency is *** the DC bias coefficient is 1.0 and 1.5,the main frequency of vibration moves to the right to 250 Hz and 350 *** on the principle of similarity,a DC bias vibration experimental platform for converter transformers is developed,and DC bias magnetic experiments are conducted to verify the reliability of the simulation results.

关键词： DC bias converter transformer finite element and experimental analysis

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Parameter Estimation of Sub-/Super-synchronous Oscillation Based on Interpolated All-phase Fast Fourier Transform with Optimized Window Function

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Journal of Modern Power Systems and Clean Energy 2024年第4期12卷 1031-1041页

作者： Bo Sun Xi Wu Xi Chen Zixiao zou Qiang Li Bixing Ren School of Electrical Engineering Southeast UniversityNanjingChina State Grid Jiangsu Electric Power Company Limited Research Institute NanjingChina

In recent years,with increasing amounts of renew-able energy sources connecting to power grids,sub-/super-syn-chronous oscillations(SSOs)occurred more *** to the time-variant nature of SsO magnitudes and frequencies,as well as the mutual interferences among SsO modes with close frequencies,the accurate parameter estimation of SsO has be-come a particularly challenging *** solve this issue,this paper proposes an improved spectrum analysis method by im-proving the window function and a spectrum correction method to achieve higher ***,by aiming at the sidelobe characteristics of the window function as evaluation criteria,a combined cosine function is optimized using a genetic algorithm(GA).Furthermore,the obtained window function is self-con-volved to extend its excellent characteristics,which have better performance in reducing mutual interference from other SSO ***,a new form of interpolated all-phase fast Fourier transform(IpApFFT)using the optimized window func-tion is proposed to estimate the parameters of *** meth-od allows for phase-unbiased estimation while maintaining algo-rithmic simplicity and *** performance of the pro-posed method is demonstrated under various conditions,com-pared with other estimation *** results vali-date the effectiveness and superiority of the proposed method.

关键词： Sub-/Super-synchronous oscillation(SSO) window function parameter estimation interpolated all-phase fast Fourier transform(ApFFT)

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Functional thermal fluids and their applications in battery thermal management:A comprehensive review

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Journal of Energy Chemistry 2024年第7期94卷 78-101页

作者： Xinyue Xu Keyu Weng Xitao Lu Yuanqiang Zhang Shuyan Zhu Deqiu zou Faculty of Maritime and Transportation Ningbo UniversityNingbo 315211ZhejiangChina

With the increasing requirements for fast charging and discharging,higher requirements have been put forward for the thermal management of power ***,there is an urgent need to develop efficient heat transfer *** a new type of heat transfer fluids,functional thermal fluids mainly includ-ing nanofluids(NFs)and phase change fluids(PCFs),have the advantages of high heat carrying density,high heat transfer rate,and broad operational temperature ***,challenges that hinder their practical applications *** this paper,we firstly overview the classification,thermophysical prop-erties,drawbacks,and corresponding modifications of functional thermal *** NFs,the high ther-mal conductivity and high convective heat transfer performance were mainly elaborated,while the stability and viscosity issues were also *** then for PCFs,the high heat carrying density was mainly elaborated,while the problems of supercooling,stability,and viscosity were also *** this basis,the composite fluids combined NFs and PCFs technology,has been ***,the thermal properties of traditional fluids,NFs,PCFs,and composite fluids are compared,which proves that functional thermal fluids are a good choice to replace traditional fluids as ***,battery thermal management system(BTMS)based on functional thermal fluids is summarized in detail,and the thermal management effects and pump consumption are compared with that of water-based ***,the current technical challenges that parameters optimization of functional thermal fluids and structures optimization of BTMS systematically are *** the future,it is necessary to pay more attention to using machine learning to predict thermophysical properties of functional thermal fluids and their applications for BTMS under actual vehicle conditions.

关键词： Functionalthermal fluids Nanofluids Phase change fluids Battery thermal management system Thermophysical properties

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Commentary on “Why people should run after positive affective experiences instead of health benefits”

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Journal of Sport and Health Science 2024年第4期13卷 451-452页

作者： Ting Wang Jinghua Chen Robert Schinke Liye zou Body-Brain-Mind Laboratory School of PsychologyShenzhen UniversityShenzhen 518060China School of Kinesiology and Health Sciences Laurentian UniversitySudburyON P3E 2C6Canada

Maltagliati et al.1 recently highlighted the vital role of affective experiences in promoting physical activity(PA).The authors suggested that positive affective experiences,rather than health benefits,can tip the balance in favor of PA over sedentary *** authors proposed a new formal decision model between PA and sedentary alternatives and reported that when health benefits are the unique reason to action,the costs of PA(e.g.,effort)and the subjective value(SV)of sedentary alternatives(V_(sed))are the main drivers of decision-making processes.

关键词： benefits formal decision

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Construction of flower-like MoS_(2)decorated on Cu doped CoZn-ZIF derived N-doped carbon as superior microwave absorber

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Nano Research 2024年第9期17卷 8250-8260页

作者： Yun Han Di Lan Mengjun Han Zihao Xia Jiaxiao zou Zirui Jia College of Chemistry and Chemical Engineering Qingdao UniversityQingdao 266071China School of Materials Science and Engineering Hubei University of Automotive TechnologyShiyan 442002China

The rational design of composition nanostructures and morphologies of the carbon-based composites materials has a significant potential for tuning electromagnetic parameters and thereby improving their performance as electromagnetic wave(EMW)*** this work,the flower-like Cu/Co-NC/MoS_(2)(NC=N-doped carbon skeleton)composites were successfully prepared by employing CuCoZn-ZIF(ZIF=zeolitic imidazolate framework)as precursor with subsequent annealing and hydrothermal *** unique flower-like morphology and electromagnetic synergy strategy between components enable the as-obtained Cu/Co-NC/MoS_(2)composites to exhibit outstanding microwave absorption ***,the minimum reflection loss of Cu/Co-NC/MoS_(2)reaches-54.36 dB at 2.7 *** the thickness reduces to 2.2 mm,the maximum effective absorption bandwidth can be achieved as large as 6.72 *** research develops useful ideas for optimizing multicomponent microwave absorbing materials.

关键词： ternary metal-organic frameworks(MOFs) MoS_(2) flower-like morphology microwave absorption

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Double stimulus-responsive palladium catalysts for ethylene polymerization and copolymerization

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Chinese Chemical Letters 2024年第7期35卷 407-411页

作者： Hailong He Wenbing Wang Wenmin Pang Chen zou Dan Peng CAS Key Laboratory of Soft Matter Chemistry Department of Polymer Science and EngineeringUniversity of Science and Technology of ChinaHefei National Laboratory for Physical Sciences at the MicroscaleHefei 230026China

The external stimulus response strategy has been evolved rapidly in the field of olefin *** this work,we modularly synthesized three types of double stimulus responsiveα-diimine palladium catalysts,combining redox regulation and other regulation together,such as light,Lewis acid and alkali *** catalytic activities and the molecular weight of polyethylene products can be regulated for 4 times in ethylene *** palladium complexes were also used for the copolymerization reaction of ethylene and polar monomers,such as methyl 10-undecylenate and methyl acrylate,effectively regulating the catalytic activities,the molecular weight and polar monomer incorporation of the prepared *** research on these dual-regulated palladium complexes makes full use of prepared catalysts and provides new inspirations for regulating olefin polymerization.

关键词： Dual-regulated Stimulus-responsive Palladium Ethylene polymerization Polar monomer

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Genome mining of multi-substituted alkylresorcinols from a hybrid highly reducing-and typeⅢ-polyketide pathway

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Chinese Chemical Letters 2024年第7期35卷 345-349页

作者： Huaran Zhang Yuting Huang Yingjie Tang Dekun Kong Yi zou College of Pharmaceutical Sciences Southwest UniversityChongqing 400715China

Fungal alkylresorcinols are a class of polyketides,which are commonly synthesized by the hybridization of highly reducing polyketide synthase(hrPKS)with non-reducing polyketide synthase(nrPKS).In this study,we identified and demonstrated a new assembly model for synthesizing alkylresorcinol(scirpilin A,1),which was accomplished by collaboration of a hrPKS(FscA)and a typeⅢPKS(FscB).Furthermore,three post-tailoring enzymes(FscC,FscD,and FscE)act iteratively on 1 skeleton,including successive 14e-oxidation of inert carbons,di-halogenation,and di-methylation,to form highly oxidized and multisubstituted *** work presents an unusual synthesis manner of alkylresorcinols,sheds light on the collaborative mechanism between hrPKS and typeⅢPKS and provides three valuable enzymatic catalysts for the tailoring of alkylresorcinol family natural products in future.

关键词： Genome mining Alkylresorcinol hrPKS TypeⅢPKS Iterative catalysis

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Vector field path following for a micro flapping-wing robot

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Science China(Information Sciences) 2024年第6期67卷 442-444页

作者： Haifeng HUANG Yingte LIU Tao NIU Chang WANG Yao zou Wei HE School of Intelligence Science and Technology University of Science and Technology Beijing Institute of Artificial Intelligence University of Science and Technology Beijing Key Laboratory of Intelligent Bionic Unmanned Systems Ministry of EducationUniversity of Science and Technology Beijing

Flapping-wing robots mimic the flight patterns of natural flying creatures,granting them natural *** hold promising applications in the military reconnaissance,urban surveillance,and various other fields[1–3].However,the current limitations in size often restrict the suitability of existing bird-like flapping-wing robots,

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Enhancing hydrolytic stability of dynamic imine bonds and polymers in acidic media with internal protecting groups

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Chinese Chemical Letters 2024年第5期35卷 161-165页

作者： Hang Chen Chengzhi Cui Hebo Ye Hanxun zou Lei You College of Environmental and Biological Engineering Fujian Provincial Key Laboratory of Ecology-Toxicological Effects&Control for Emerging ContaminantsPutian UniversityPutian 351100China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China College of Chemistry and Material Science Fujian Normal UniversityFuzhou 350007China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China

Imine bonds are among the most explored building motifs in dynamic chemistry,polymers,and materials,and yet,their acid-resistance remains a longstanding *** we demonstrate a concept of internal protecting groups for improving the kinetic stability of dynamic imine bonds and *** examination of structure-reactivity relationship of a series of aldehydes/imines bearing a neighboring carboxyl allowed uncovering of required structural features for dynamically masking imine bonds with cyclic *** studies indicated that noncovalent interactions along with sterics control the ringchain equilibrium and the stability of imine *** incorporation of internal protecting groups into imine polymers further enabled their controlled stability in acidic ***,a combination of dynamic covalent network and coordination supramolecular network provided a facile means for the modulation of luminescent and mechanical properties of *** strategies and results reported should be beneficial to molecular assemblies,dynamic polymers,biological delivery,and intelligent materials.

关键词： Dynamic covalent chemistry Internal protecting group Kinetic stability Imine bond Dynamic polymer

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