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Facile synthesis of gradient copolymers enabled by droplet-flow photo-controlled reversible deactivation radical polymerization

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Science China Chemistry 2021年第5期64卷 844-851页

作者： Yang Zhou Shantao han Yu Gu mao Chen State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan UniversityShanghai 200438China

Monomer sequence influences the properties and applications of ***,massive efforts have been made to implement sequence control of *** this work,we developed a computer-aided droplet-flow polymerization based on photo-controlled reversible-deactivation radical polymerization(photo-RDRP),enabling synthesis of gradient copolymers of tunable sequential arrangements,low dispersity and good structural fidelity from various monomers without following their intrinsic reactivities,which is a key limitation in sequence *** obtained gradient copolymers exhibit unique thermal properties and stimulus responsiveness comparing with the random and block counterparts,and their glass transition behaviour could be regulated by the gradient *** believe that the unprecedented gradient photo-RDRP based on flow synthesis opens a robust and versatile avenue to streamline the synthesis of well-defined gradient polymers,and is compatible with other polymerization mechanisms.

关键词： controlled radical polymerization photopolymerization gradient copolymer flow chemistry sequence control

An optimized time-adaptive aerothermal coupling calculation method for aerothermal analysis of disc cavity system

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Chinese Journal of Aeronautics 2024年第9期37卷 164-177页

作者： Shuai BI Junkui mao Lei WANG Feng han College of Energy and Power Engineering Nanjing University of Aeronautics and AstronauticsNanjing 20016China AECC Aeroengine Control System Institute Wuxi 214063China Integrated Energy Institute Nanjing University of Aeronautics and AstronauticsNanjing 210016China

In order to further achieve the balance between the calculation accuracy and efficiency of the transient analysis of the aero-engine disc cavity system,an Optimized Time-adaptive Aerother-mal Coupling calculation(OTAC)method has been *** combines one-dimensional tran-sient calculation of air system,Conventional Sequence Staggered(CSS)method,Time-adaptive Aerothermal Coupling calculation(TAC)method and differential evolution optimization algorithm to obtain an efficient and high-precision aerothermal coupling calculation method of air *** both the heat conduction in the solid domain and the flow in the fluid domain as unsteady states in the OTAC,the interaction of fluid-solid information within a single coupling time step size was implemented based on the CSS ***,the coupling time step size was automatically adjusted with the number of iterations by using the Proportional-Integral-Deri vative(PID)*** show that when compared with the traditional loosely coupling method with a fixed time step size,the computational accuracy and efficiency of the OTAC method are improved by 8.9%and 30%,*** with the tight coupling calculation,the OTAC method can achieve a speedup of 1 to 2 orders of magnitude,while the calculation error is maintained within 6.1%.

关键词： Air system 1D-3D coupling Conjugate heat transfer Transient calculation Adaptive time step size

Distributed Secondary Control of AC Microgrids With External Disturbances and Directed Communication Topologies:A Full-Order Sliding-Mode Approach

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IEEE/CAA Journal of Automatica Sinica 2021年第3期8卷 554-564页

作者： Boda Ning Qing-Long han Lei ding Center for Smart Infrastructure and Digital Construction Swinburne University of TechnologyMelbourneVIC 3122Australia School of Software and Electrical Engineering Swinburne University of TechnologyMelbourneVIC 3122Australia Institute of Advanced Technology Nanjing University of Posts and TelecommunicationsNanjing 210023China

This paper addresses the problem of distributed secondary control for islanded AC microgrids with external *** using a full-order sliding-mode(FOSM)approach,voltage regulation and frequency restoration are achieved in finite *** voltage regulation,a distributed observer is proposed for each distributed generator(DG)to estimate a reference voltage *** from some conventional observers,the reference voltage level in this paper is accurately estimated under directed communication *** on the observer,a new nonlinear controller is designed in a backstepping manner such that an FOSM surface is reached in finite *** the surface,the voltages of DGs are regulated to the reference level in finite *** frequency restoration,a distributed controller is further proposed such that a constructed FOSM surface is reached in finite time,on which the frequencies of DGs are restored to a reference level in finite time under directed communication ***,case studies on a modified IEEE 37-bus test system are conducted to demonstrate the effectiveness,the robustness against load changes,and the plug-and-play capability of the proposed controllers.

关键词： Directed communication topologies distributed secondary control external disturbances full-order sliding-mode control microgrids

A multiphysics model for studying transient crevice corrosion of stainless steel

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Journal of Materials Science & Technology 2021年第1期60卷 186-196页

作者： Jiawei ding Haitao Wang En-Hou han CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei230026China

The transient crevice corrosion behavior of 304 stainless steel in NaCl solution has been investigated by a multiphysics coupling *** model considers local electrochemical reactions,transport of diffe rent species,and homogeneous *** moving mesh method is used to obtain the geometrical change of the crevice wall with time due to *** level set method is employed to quantitatively describe the influence of the precipitation process on electrochemical *** transient crevice corrosion morphology,potential and current distributions,and pH and chloride ion concentration distributions are obtained by *** effect of crevice geometry factors on the corrosion process is also *** simulation results are in good agreement with the experiments,showing that the model has high reliability.

关键词： Stainless steel Crevice corrosion Simulation Multiphysics Transient behavior

Dirac method for nonlinear and non-homogenous boundary value problems of plates

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Applied Mathematics and Mechanics(English Edition) 2024年第1期45卷 15-38页

作者： Xiaoye mao Jiabin WU Junning ZhanG Hu ding Liqun CHEN Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai Frontier Science Center of MechanoinformaticsShanghai Institute of Applied Mathematics and MechanicsSchool of Mechanics and Engineering ScienceShanghai UniversityShanghai 200444China Shanghai Institute of Aircraft Mechanics and Control Shanghai 200092China

The boundary value problem plays a crucial role in the analytical investigation of continuum dynamics. In this paper, an analytical method based on the Dirac operator to solve the nonlinear and non-homogeneous boundary value problem of rectangular plates is proposed. The key concept behind this method is to transform the nonlinear or non-homogeneous part on the boundary into a lateral force within the governing function by the Dirac operator, which linearizes and homogenizes the original boundary, allowing one to employ the modal superposition method for obtaining solutions to reconstructive governing equations. Once projected into the modal space, the harmonic balance method(HBM) is utilized to solve coupled ordinary differential equations(ODEs)of truncated systems with nonlinearity. To validate the convergence and accuracy of the proposed Dirac method, the results of typical examples, involving nonlinearly restricted boundaries, moment excitation, and displacement excitation, are compared with those of the differential quadrature element method(DQEM). The results demonstrate that when dealing with nonlinear boundaries, the Dirac method exhibits more excellent accuracy and convergence compared with the DQEM. However, when facing displacement excitation, there exist some discrepancies between the proposed approach and simulations;nevertheless, the proposed method still accurately predicts resonant frequencies while being uniquely capable of handling nonuniform displacement excitations. Overall, this methodology offers a convenient way for addressing nonlinear and non-homogenous plate boundaries.

关键词： rectangular plate Dirac operator nonlinear boundary time-dependent boundary boundary value problem

Fully Distributed Risk-based Robust Reserve Scheduling for Bulk Hybrid AC-DC Systems

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CSEE Journal of Power and Energy Systems 2023年第2期9卷 634-644页

作者： Zhe Chen Shufeng Dong Chuangxin Guo Yi ding hangyin mao the college of Electrical Engineering in Zhejiang University HangzhouZhejiang 310027China Zhejiang Power Grid Co. LTD.HangzhouZhejiang 310027China

To enhance the cost-effectiveness of bulk hybrid AC-DC power systems and promote wind consumption,this paper proposes a two-stage risk-based robust reserve scheduling(RRRS)*** from traditional robust optimization,the proposed model applies an adjustable uncertainty set rather than a fixed ***,the operational risk is optimized together with the dispatch schedules,with a reasonable admissible region of wind power obtained *** addition,both the operational base point and adjustment capacity of tielines are optimized in the RRRS model,which enables reserve sharing among the connected areas to handle the significant wind *** on the alternating direction method of multipliers(ADMM),a fully distributed framework is presented to solve the RRRS model in a distributed way.A dynamic penalty factor adjustment strategy(DPA)is also developed and applied to enhance its convergence *** only limited information needs to be exchanged during the solution process,the communication burden is reduced and regional information is *** studies on the 2-area 12-bus system and 3-area 354-bus system illustrate the effectiveness of the proposed model and approach.

关键词： Dynamic penalty factor adjustment strategy fully distributed framework hybrid AC-DC systems reserve scheduling risk robust optimization

Role of intelligent/interactive qualitative and quantitative analysisthree-dimensional estimated model in donor-recipient size mismatch following deceased donor liver transplantation

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World Journal of Gastroenterology 2023年第44期29卷 5894-5906页

作者： han ding Zhi-Guo ding Wen-Jing Xiao Xu-Nan mao Qi Wang Yi-Chi Zhang Hao Cai Wei Gong Department of Transplantation Xinhua HospitalAffiliated to Shanghai Jiaotong University School of MedicineShanghai 200092China Department of General Surgery The Third People’s Hospital of YangzhouYangzhou 225126Jiangsu ProvinceChina Department of Tuberculosis Control Shanghai Municipal Center for Disease Control and PreventionShanghai 200336China Department of Biliary-Pancreatic Surgery Shanghai Changzheng HospitalSecond Military Medical UniversityShanghai 200003China Department of Pathology First Affiliated Hospital of Nanjing Medical UniversityNanjing 210029JiangsuChina Department of General Surgery Xinhua HospitalAffiliated to Shanghai Jiaotong University School of MedicineShanghai 200092China Shanghai Key Laboratory of Biliary Tract Disease Research Shanghai200092China

BACKGROUND Donor-recipient size mismatch(DRSM)is considered a crucial factor for poor outcomes in liver transplantation(LT)because of complications,such as massive intraoperative blood loss(IBL)and early allograft dysfunction(EAD).Liver volumetry is performed routinely in living donor LT,but rarely in deceased donor LT(DDLT),which amplifies the adverse effects of DRSM in *** to the various shortcomings of traditional manual liver volumetry and formula methods,a feasible model based on intelligent/interactive qualitative and quantitative analysis-three-dimensional(IQQA-3D)for estimating the degree of DRSM is *** To identify benefits of IQQA-3D liver volumetry in DDLT and establish an estimation model to guide perioperative *** We retrospectively determined the accuracy of IQQA-3D liver volumetry for standard total liver volume(TLV)(sTLV)and established an estimation TLV(eTLV)index(eTLVi)*** operating characteristic(ROC)curves were drawn to detect the optimal cut-off values for predicting massive IBL and EAD in DDLT using donor sTLV to recipient sTLV(called sTLVi).The factors influencing the occurrence of massive IBL and EAD were explored through logistic regression ***,the eTLVi model was compared with the sTLVi model through the ROC curve for *** A total of 133 patients were included in the *** Changzheng formula was accurate for calculating donor sTLV(P=0.083)but not for recipient sTLV(P=0.036).Recipient eTLV calculated using IQQA-3D highly matched with recipient sTLV(P=0.221).Alcoholic liver disease,gastrointestinal bleeding,and sTLVi>1.24 were independent risk factors for massive IBL,and drug-induced liver failure was an independent protective factor for massive *** donor-female recipient combination,model for end-stage liver disease score,sTLVi≤0.85,and sTLVi≥1.32 were independent risk factors for EAD,and viral hepatitis was an independent protective factor for *** overall surv

关键词： Intelligent/interactive qualitative and quantitative analysis-three-dimensional Donor-recipient size mismatch Intraoperative blood loss Early allograft dysfunction

Chelating ligand-bridged IO-Gd nanoparticles with enhanced contrast performance for dual-mode MRI

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Journal of Materials Science & Technology 2024年第17期184卷 54-63页

作者： Lili Hao Haoyang ding Xiangchuan Xu Hongli mao Zhongwei Gu Research Institute for Biomaterials Tech Institute for Advanced MaterialsBio-inspired Biomedical Materials&Devices CenterCollege of Materials Science and EngineeringJiangsu Collaborative Innovation Center for Advanced Inorganic Function CompositesSuqian Advanced Materials Industry Technology Innovation CenterNanjing Tech UniversityNanjing 211816China NJTech-BARTY Joint Research Center for Innovative Medical Technology Nanjing 210000China

Magnetic resonance imaging(MRI)is a non-invasive medical imaging technique that has been widely applied in the clinical diagnosis of diseases across various ***,there is a dearth of high-performance dual-mode contrast agents that provide precise diagnostic information for complex *** this study,iron oxide-gadolinium nanoparticles(IO-Gd NPs)bridged by hydrophilic ligand ethylenedi-amine tetramethylenephosphonic acid(EDTMP)are designed inspired by Solomon-Bloembergen-Morgan(SBM)theory,where T_(1)and T_(2)relaxivity increase with a reduction in Gd *** particular,the NPs with minimum Gd content exhibit excellent dual-mode contrast performance(r_(1)=94.42 mM^(−1)s^(−1),r_(2)=343.62 mM^(−1)s^(−1)).The underlying mechanism is that the bridged EDTMP coordinate limits Gd tum-bling and forces Gd^(3+)to expose itself to the surface of the *** provides more opportunities for water molecules to coordinate with Gd^(3+)and significantly enhances proton ***,the hy-drophilicity of the ligand enhances the water dispersion stability of the NPs and increases the exchange rate of water protons near the NPs,further enhancing the dual-mode contrast ***,the biocom-patibility and in vitro/vivo imaging performances of the IO@EDTMP-Gd NPs are systematically evaluated,and the results demonstrate their potential as dual-mode contrast *** study provides a new strategy for developing dual-mode MRI contrast agents that can further improve the accuracy of MRI in the diagnosis of complex diseases.

关键词： Magnetic resonance imaging Dual-mode contrast agent Chelating ligand Iron oxide Gadolinium

Configuration Synthesis and Performance Analysis of 9‑Speed Automatic Transmissions

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Chinese Journal of Mechanical Engineering 2020年第3期33卷 97-117页

作者： Huafeng ding Changwang Cai Ziming Chen Tao Ke Bowen mao School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China Hebei Provincial Key Laboratory of Parallel Robot and Mechatronic System Yanshan UniversityQinhuangdao 066004China School of Mechanical Engineering and Electronic Information China University of Geosciences(Wuhan)Wuhan 430074China.

Current research of automatic transmission(AT)mainly focuses on the improvement of driving performance,and configuration innovation is one of the main research ***,finding new configurations of ATs is one of the main limitations of configuration *** the present study,epicyclic gear trains(EGTs)are applied to investigate mechanisms of 9-speed *** four kinematic configurations are proposed for automatic *** order to evaluate the performance of proposed mechanisms,the lever analogy method is applied to conduct kinematic and mechanical *** power flow analysis is conducted,and then transmission efficiencies are calculated based on the torque *** comparative analysis between the proposed and existing mechanisms is carried out where obtained results show that proposed mechanisms have reasonable performance and can be used in *** prototype of an AT is manufactured and the speed test is conducted,which proves the accuracy of analysis and the feasibility of proposed mechanisms.

关键词： Automatic transmission Epicyclic gear train Lever analogy Gear ratio Torque method