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Precontrol of short-period motion for a Tension Leg Platform

Journal of Ocean Engineering and Science 2024年第3期9卷 264-277页

作者： Hao wu Yan Lin Yongxi wu School of Mechatronic Engineering and Automation Shanghai UniversityShanghai 200444China Department of Naval Architecture Dalian University of TechnologyDalian 116023China State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of TechnologyDalian 116023China School of Mechanics and Engineering Science Shanghai UniversityShanghai 200444China

The Tension Leg Platform(TLP)is a hybrid,compliant platform designed to sustain springing and ringing responses that are correlated to short-period *** the period of short-period motion is within the wave energy concentration region,TLPs may experience sensitive short-period motion,such as resonance and green water,that usually cause serious damage to *** this study,a precontrol methodology is presented as a solution to prevent TLP-sensitive short-period *** applying the precontrol methodology,the parameters of TLP can be predetermined,allowing TLP motion performance to meet the requirements of short-period motion before sensitive motions actually *** example,the damping coefficient should be less than 4.3,the tendons’stiffness should be larger than 0.91×10^(8),and the dimensionless draft should be less than *** development of a precontrol methodology is based on a solid theoretical ***,a series of simple and high-fidelity numerical models are proposed to simulate the natural period of roll,natural period of heave,and green water ***,a constraint regime is generated based on the numerical models and the sensitive motion range of short-period *** constraint regime is divided into two parts:the control range(corresponding to sensitive shortperiod motion)and the feasible range(the complementary set of control ranges in the whole parameter constraint domain).Finally,TLP parameters are derived from the calculated feasible *** precontrol methodology goes beyond the conventional approach of real-time control by changing the control from a remedial action to a preventive action.

关键词： Precontrol Constraint regime Short-period motion TLP

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Hybrid Modular Smart Transformer for Asymmetrically Bidirectional Power Flow Operation

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CSEE Journal of Power and Energy Systems 2024年第4期10卷 1384-1398页

作者： Kangan Wang Youngjong Ko Rongwu Zhu Siyu wu Weimin wu Marco Liserre Shanghai Maritime University Shanghai 201306China Pukyong National University Busan 48513South Korea Harbin Institute of Technology(Shenzhen) Shenzhen 518000China Kiel University Kiel 24118Germany

The presence of renewable energy resources in LV distribution networks may lead to a distribution transformer,also known as a Smart Transformer(ST),experiencing the bidirectional power ***,the ST must have the capability to operate in both ***,the reverse power is less as compared to the forward power,thus the design of ST with the same capacity in both directions increases the hardware cost and decreases the system *** paper proposes a Hybrid-modular-ST(H-ST),composed of a mixed use of single active bridge-based series resonant converter and dual active bridge instead of complete use of uni-or bi-directional converter adopted in the conventional *** on the proposed H-ST,the impacts of power imbalance among cascaded modules in reverse operation mode are analyzed and then an effective solution based on reactive power compensation combined with the characteristics of the proposed architecture is *** simulation and experimental results clearly validate the effectiveness and feasibility of the theoretical analyses.

关键词： Cascaded H-bridge dual-active bridge series resonant converter smart transformer(ST) three-stage architecture

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Designing ultrastable P2/O3-type layered oxides for sodium ion batteries by regulating Na distribution and oxygen redox chemistry

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Journal of Energy Chemistry 2024年第7期94卷 466-476页

作者： Jieyou Huang Weiliang Li Debin Ye Lin Xu Wenwei wu Xuehang wu School of Chemistry and Chemical Engineering Guangxi UniversityNanning 530004GuangxiChina Guangxi Key Laboratory for High-value Utilization of Manganese Resources Guangxi Normal University for NationalitiesChongzuo 532200GuangxiChina

P2/O3-type Ni/Mn-based layered oxides are promising cathode materials for sodium-ion batteries(SIBs)owing to their high energy ***,exploring effective ways to enhance the synergy between the P2 and 03 phases remains a ***,we design a P2/O3-type Na_(0.76)Ni_(0.31)Zn_(0.07)Mn_(0.50)Ti_(0.12)0_(2)(NNZMT)with high chemical/electrochemical stability by enhancing the coupling between the two *** the first time,a unique Na*extraction is observed from a Na-rich O3 phase by a Na-poor P2 phase and systematically *** process is facilitated by Zn^(2+)/Ti^(4+)dual doping and calcination condition regulation,allowing a higher Na*content in the P2 phase with larger Na^(+)transport channels and enhancing Na transport *** of reduced Na^(+)in the O3 phase,which increases the difficulty of H^(+)/Na^(+) exchange,the hydrostability of the O3 phase in NNZMT is considerably ***,Zn^(2+)/Ti^(4+)presence in NNZMT synergistically regulates oxygen redox chemistry,which effectively suppresses O_(2)/CO_(2) gas release and electrolyte decomposition,and completely inhibits phase transitions above 4.0 *** a result,NNZMT achieves a high discharge capacity of 144.8 mA h g^(-1) with a median voltage of 3.42 V at 20 mA g^(-1) and exhibits excellent cycling performance with a capacity retention of 77.3% for 1000 cycles at 2000 mA g^(-1).This study provides an effective strategy and new insights into the design of high-performance layered-oxide cathode materials with enhanced structure/interface stability forSIBs.

关键词： Sodium-ion batteries P2/O3-type layered oxides Na distribution Oxygen redox chemistry Hydrostability

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A fuse-based DC circuit breaker with vacuum interrupter enhanced by an external transverse magnetic field

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High Voltage 2024年第3期9卷 710-720页

作者： Yu Xiao Yi wu Yifei wu Fei Yang Mingzhe Rong Zhuo Yang State Key Laboratory of Electrical Insulation and Power Equipment School of Electric EngineeringXi'an Jiaotong UniversityXi'anChina State Grid Shaanxi Electric Power Company Limited Xi'anChina

Due to the increasing power system capacity,the interruption of large fault currents has gradually become a major challenge in power *** the moment,such currents are interrupted mainly via circuit breakers based on the method of active current ***,these types of circuit breakers tend to be costly and *** possible alternative—a fuse-based circuit breaker with current commutation process enhanced by an external transverse magnetic field(ETMF)—is proposed by the *** main advantage lies in the fast current commutation achieved by an ETMF-enhanced three-stage increase of the vacuum arc *** study of the current commutation process is mainly represented by the authors,and the influencing factors of the current commutation—contact opening speed and ETMF current—are *** last,the proposed circuit breaker is verified by an experiment,whose results show that a short-circuit current of 42 kA can be interrupted within just 2 ms.

关键词： vacuum transverse interrupt

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Mechanism Design for Ancillary Service Market Considering Social Welfare and Fairness

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CSEE Journal of Power and Energy Systems 2024年第3期10卷 1000-1010页

作者： Zhi wu Yuanxi wu Wei Gu Zheng Xu Shu Zheng Jingtao Zhao School of Electrical Engineering Southeast UniversityNanjing 210096China NARI Technology Co. Ltd.Nanjing 211106China IEEE CSEE

Increasing penetration of distributed energy resources in the distribution network(DN)is threatening safe operation of the DN,which necessitates setup of the ancillary service market in the *** the ancillary service market,distribution system operator(DSO)is responsible for safety of the DN by procuring available capacities of *** existing studies,this paper proposes a novel market mechanism composed of two parts:choice rule and payment *** proposed choice rule simultaneously considers social welfare and fairness,encouraging risk-averse aggregators to participate in the ancillary service *** is then formulated as a linear programming problem,and a distributed solution using the multi-cut Benders decomposition is ***,successful implementation of the choice rule depends on each aggregator’s truthful adoption of private ***,a payment rule is also designed,which is proved to possess two properties:incentive compatibility and individual *** results demonstrate effectiveness of the proposed choice rule on improving fairness and verify properties of the payment rule.

关键词： Aggregator ancillary service market distributed mechanism fairness mechanism design

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Imide-pillared covalent organic framework protective films as stable zinc ion-conducting interphases for dendrite-free Zn metal anodes

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Journal of Energy Chemistry 2024年第10期97卷 470-477,I0010页

作者： Xiaoman Ye Xuemei Xiao Zhijing wu Xin wu Lin Gu Sheng Liu School of Chemical Engineering and Technology Sun Yat-sen UniversityZhuhai 519082GuangdongChina The Key Lab of Low-Carbon Chemistry&Energy Conservation of Guangdong Province Sun Yat-sen UniversityGuangzhou 510275GuangdongChina

The notorious growth of zinc dendrite and the water-induced corrosion of zinc metal anodes(ZMAs)restrict the practical development of aqueous zinc ion batteries(AZIBs).In this work,a zinc metallized,imide-pillared covalent organic framework(ZPC)protective film has been engineered as a stable Zn^(2+)ion-conducting interphase to modulate interfacial kinetics and suppress side reactions for *** to bare Zn,ZPC@Zn exhibits a higher Zn^(2+)ionic conductivity,a larger Zn^(2+)transference number,a lower electronic conductivity,a smaller desolvation activation energy and correspondingly a significant suppression of corrosion,hydrogen evolution and Zn ***,the ZPC@Zn||ZPC@Zn symmetric cell obtains a cycling lifespan over 3000 h under 5 mA cm^(-2)for 1 mA h cm^(-2).The ZPC@Zn||NH_(4)V_(4)O_(10)coin-type full battery delivers a specific capacity of 195.8 mA h g^(-1)with a retention rate of78.5%at 2 A g^(-1)after 1100 cycles,and the ZPC@Zn||NH_(4)V_(4)O_(10) pouch full cell shows a retention of70.1%in reversible capacity at 3 A g^(-1)after 1100 *** present incorporation of imide-linked covalent organic frameworks in the surface modification of ZMAs will offer fresh perspectives in the search for ideal protective films for the practicality of AZIBs.

关键词： Aqueous zinc ion batteries Zinc metal anodes Surface modification Covalent organic frameworks Imide linkage

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RecBERT:Semantic recommendation engine with large language model enhanced query segmentation for k-nearest neighbors ranking retrieval

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Intelligent and Converged Networks 2024年第1期5卷 42-52页

作者： Richard wu the Dublin Unified School District and the SF Artificial Intelligence Club DublinCA 94568USA

The increasing amount of user traffic on Internet discussion forums has led to a huge amount of unstructured natural language data in the form of user *** modern recommendation systems rely on manual tagging,relying on administrators to label the features of a class,or story,which a user comment corresponds *** common approach is to use pre-trained word embeddings to compare class descriptions for textual similarity,then use a distance metric such as cosine similarity or Euclidean distance to find top k ***,neither approach is able to fully utilize this user-generated unstructured natural language data,reducing the scope of these recommendation *** paper studies the application of domain adaptation on a transformer for the set of user comments to be indexed,and the use of simple contrastive learning for the sentence transformer fine-tuning process to generate meaningful semantic embeddings for the various user comments that apply to each *** order to match a query containing content from multiple user comments belonging to the same class,the construction of a subquery channel for computing class-level similarity is *** channel uses query segmentation of the aggregate query into subqueries,performing k-nearest neighbors(KNN)search on each individual *** achieves state-of-the-art performance,outperforming other state-of-the-art models in accuracy,precision,recall,and F1 score for classifying comments between four and eight classes,*** outperforms the most precise state-of-the-art model(distilRoBERTa)in precision by 6.97%for matching comments between eight classes.

关键词： sentence transformer simple contrastive learning large language models query segmentation k-nearest neighbors

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Principal components of nuclear mass models

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Science China(Physics,Mechanics & Astronomy) 2024年第7期67卷 65-71页

作者： Xin-Hui wu Pengwei Zhao Department of Physics Fuzhou UniversityFuzhou 350108China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China

Principal component analysis(PCA)is employed to extract the principal components(PCs)present in nuclear mass models for the first *** effects from different nuclear mass models are reintegrated and reorganized in the extracted *** PCs are recombined to build new mass models,which achieve better accuracy than the original theoretical mass *** comparison indicates that using the PCA approach,the effects contained in different mass models can be collaborated to improve nuclear mass predictions.

关键词： nuclear mass principal component analysis nuclear models statistical methods

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Sonoafterglow luminescence for in vivo deep-tissue imaging

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Chinese Chemical Letters 2024年第10期35卷 9-10页

作者： Shihong wu Ronghui Zhou Hang Zhao Peng wu State Key Laboratory of Oral Diseases West China Hospital of StomatologySichuan UniversityChengdu 610041China Analytical&Testing Center Sichuan UniversityChengdu 610064China School of Chemistry and Chemical Engineering Henan Normal UniversityXinxiang 453007China

Optical imaging is a key technique to study the pathological process and disease diagnosis,but there is still a great challenge to achieve highly sensitive in vivo deep-tissue *** interferences from the intrinsic autofluorescence and light scattering and re-absorption are typically observed in biological tissues,which severely impair target signal sensing and *** address the above issues,using of afterglow luminescence for imaging has been *** to its long lifetime,the images can be collected after ceasing the excitation,thus could eliminate the ***,the current afterglow luminescence still requires photoexcitation(mainly ultraviolet or visible light),the penetration depth of which is still limited for deeptissue imaging.

关键词： scattering luminescence excitation

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Bandgap adjustment of a sandwich-like acoustic metamaterial plate with a frequency-displacement feedback control method

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Applied Mathematics and Mechanics(English Edition) 2024年第10期45卷 1807-1820页

作者： Jianing LIU Jinqiang LI Ying wu School of Aerospace Engineering Xi’an Jiaotong UniversityXi’an 710049China College of Aerospace and Civil Engineering Harbin Engineering UniversityHarbin 150001China

Several types of acoustic metamaterials composed of resonant units have been developed to achieve low-frequency *** most of these structures,bandgaps are determined by their geometric configurations and material *** paper presents a frequency-displacement feedback control method for vibration suppression in a sandwich-like acoustic metamaterial *** band structure is theoretically derived using the Hamilton principle and validated by comparing the theoretical calculation results with the finite element simulation *** this method,the feedback voltage is related to the displacement of a resonator and the excitation *** applying a feedback voltage on the piezoelectric fiber-reinforced composite(PFRC)layers attached to a cantilever-mass resonator,the natural frequency of the resonator can be *** ensures that the bandgap moves in a frequency-dependent manner to keep the excitation frequency within the *** on this frequency-displacement feedback control strategy,the bandgap of the metamaterial plate can be effectively adjusted,and the vibration of the metamaterial plate can be significantly suppressed.

关键词： acoustic metamaterial Hamilton principle electromechanical coupling vibration control local resonance

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