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ON THE CONVERGENCE OF IMPLICIT DIFFERENCE SCHEMES FOR HYPERBOLIC CONSERVATION LAWS

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Journal of Computational Mathematics 2002年第2期20卷 121-128页

作者： hua-zhong Tang hua-mo wu School of Mathematical Sciences Peking UniversityBeijing 100871China LSEC ICMSECAcademy of Mathematics and System SciencesChinese Academy of SciencesBeijing 100080China

Discusses the treatment of implicit difference approximations to hyperbolic conservation laws with non-convex flux. Information on weighted implicit difference schemes; Convergence of difference scheme; Establishment ... 详细信息

关键词： conservation laws weighted implicit schemes entropy solution

FIRST-ORDER AND SECOND-ORDER, CHAOS-FREE, FINITE DIFFERENCE SCHEMES FOR FISHER EQUATION

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Journal of Computational Mathematics 2001年第5期19卷 519-530页

作者： Geng Sun hua-mo wu Li-er Wang Institute of Mathematics Academy of Mathematics and Systems SciencesChinese Academy of SciencesBeijing 100080China LSEC ICMSECAcademy of Mathematics and Systems SciencesChinese Academy of SciencesBeijing 100080China

Presents a study which constructed a class of finite difference schemes for Fisher partial differential equation. Properties of solutions for logistic equation; Construction of high fidelity algorithms; Numerical meth... 详细信息

关键词： reaction-diffusion equation fidelity algorithm

ON A CELL ENTROPY INEQUALITY OF THE RELAXINGSCHEMES FOR SCALAR CONSERVATION LAWS

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Journal of Computational Mathematics 2000年第1期18卷 69-74页

作者： hua-zhong Tang hua-mo wu(State Key Labomtory of Scientific and Engineering Computing, Institute of ComputationalMathematics, Chinese Academy of Sciences, Beijing 100080, China) 中科院计算数学所科学与工程计算国家重点实验室北京 100080

Presents a study which examined a cell entropy inequality for a class of local relaxation approximation relaxing scheme for scalar conservation laws. Way to obtain the scheme; Use of numerical entropy condition for th... 详细信息

关键词： hyperbolic conservation laws the relaxing schemes cell entropy inequality

Analysis of System Value Evolution Trends of Energy Storage in Decarbonization Process

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Energy Engineering 2024年第10期121卷 3037-3053页

作者： mo Zhou Jingming Zhao Zili Chen Qiushi Fang hua Li Zhaoyuan wu State Grid Liaoning Electric Power Supply Co. Ltd.StateGrid Liaoning Electric Power Company Limited Economic Research InstitueteShenyang110015China School of Electrical and Electronic Engineering North China Electric Power UniversityBeijing102206China

With the continuous expansion of the scale of renewable energy installation,the demand for energy storage has increased ***,there are significant differences in the value of energy storage in different scenarios,and the phenomenon of diminishing marginal benefits of energy storage is becoming more ***,themulti-dimensional value evolution trend of energy storage has become a key *** study selects indicators from three dimensions of energy storage:low-carbon emission reduction,smoothing wind and solar power fluctuations,and saving generation costs,quantifying the economic,environmental,and technical values of energy *** forms a quantitative evaluation system for energy storage *** comparing the calculated system values under different energy storage capacities,the marginal value evolution trend of energy storage is ***,considering factors such as the utilization rate of renewable energy,the change in energy storage value under different scenarios is *** results show that the value of long-duration energy storage is significantly affected by the energy storage ***,when the charge-discharge efficiency of longduration energy storage reaches 0.6 or above,the system value increases ***,appropriately reducing the cost of energy storage capacity also helps to improve its system value.

关键词： Quantitative evaluation of value marginal benefit joint planning value evolution trend

Recent Advances of Imide-Functionalized Polymer Donors for Non-fullerene Solar Cells

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Chinese Journal of Chemistry 2024年第15期42卷 1759-1780页

作者： Huijuan Wang Songmin mo Dongyan Li Qinghe wu Department of Chemistry and Key(Guangdong-Hong Kong Joint)Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Shantou UniversityShantouGuangdong 515063China

In recent years,there has been a shift towards using non-fullerene electron acceptors in organic solar cells(osCs)as a replacement for fullerene *** change requires polymer donors that possess compatible physical properties,such as absorption range,Homo energy level,miscibility,and ***,the high cost and poor batch-to-batch reproducibility of polymer donors also hinder future large-scale *** emphasize the need to explore alternative types of polymer *** imide-functionalized building units possess several key attributes that make their polymers highly promising for non-fullerene *** attributes include ease of synthesis,strong electron-withdrawing ability,rigid and co-planar structure,and the ability to easily tune solubility through imide side *** this review,we summarized the synthetic routes of imide building units,and the structural evolution of imide-functionalized polymer donors by focusing on the effects of polymer structure on their physical,optoelectronic,and photovoltaic *** hope that this mini-review will serve as a catalyst for future research on imide-functionalized polymers toward high-performance,cost-effective,and durable organic solar cells(oscs).

关键词： Imide Polymer donors Organic solar cells Synthetic routes Polymer structure evolution

Cu_(2)Se@C thin film with three-dimensional braided structure as a cathode material for enhanced Cu^(2+) storage

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Chinese Chemical Letters 2024年第5期35卷 523-528页

作者： Wenhao Chen Muxuan wu Han Chen Lue mo Yirong Zhu College of Materials and Advanced Manufacturing Hunan University of TechnologyZhuzhou 412007China Hunan Key of Laboratory of Applied Environmental Photocatalysis Changsha UniversityChangsha 410022China

In the face of multiple challenges brought by the changes of global climate and environment,developing clean energy and updating green energy storage equipment are important ways to achieve carbon peak and carbon *** batteries have become a research hotspot due to their advantages of using the multivalent charge carrier,high ionic conductivity,environmental friendliness and cost *** this work,the Cu_(2)Se@C(Cu_(2)Se coated on carbon clothes)thin film with a three-dimensional braided structure is fabricated by a simple electrochemical deposition method for Cu^(2+)storage for the first *** with the commercial Cu_(2)Se powder,the well-designed Cu_(2)Se@C film shows enhanced specific capacity(640 mAh/g at 0.5 A/g)and rate performance(542 mAh/g at 5 A/g)as well as superior cycling stability(82.7%capacity retention after 1000 cycles at 1 A/g).The Cu^(2+)storage mechanism of the Cu_(2)Se@C electrode is based on a reversible phase transition process of Cu_(2)Se←→Cu_(2-x)Se←→CuSe←→CuSe_(2).In kinetic characteristic analysis,the Cu_(2)Se@C electrode demonstrates faster Cu^(2+)diffusion in discharge process than charge process resulting from the phase transition and the variation of interplanar *** work highlights a facile one-piece design strategy and opens a new gateway for the exploration of advanced aqueous energy storage systems.

关键词： Cu_(2)Se@C Cu^(2+)storage Conversion mechanism Kinetic characteristic Flexible energy storage

Rheological properties and concentration evolution of thickened tailings under the coupling effect of compression and shear

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International Journal of Minerals,Metallurgy and Materials 2024年第5期31卷 862-876页

作者： Aixiang wu Zhenqi Wang Zhuen Ruan Raimund Bürger Shaoyong Wang Yi mo Key Laboratory of the Ministry of Education of China for High-efficient Mining and Safety of Metal Mines University of Science and Technology BeijingBeijing 100083China Shunde Innovation School University of Science and Technology BeijingFoshan 528399China CI2MA and Departamento de Ingeniería Matemática Facultad de Ciencias Físicas y MatemáticasUniversidad de ConcepciónCasilla 160-CConcepciónChile School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China China Railway Construction Tongguan Investment Co. Ltd.Tongling 244000China

Cemented paste backfill(CPB)is a key technology for green mining in metal mines,in which tailings thickening comprises the primary link of CPB ***,difficult flocculation and substandard concentrations of thickened tailings often *** rheological properties and concentration evolution in the thickened tailings remain ***,traditional indoor thickening experiments have yet to quantitatively characterize their rheological *** experiment of flocculation condition optimization based on the Box-Behnken design(BBD)was performed in the study,and the two response values were investigated:concentration and the mean weighted chord length(MWCL)of ***,optimal flocculation conditions were *** addition,the rheological properties and concentration evolution of different flocculant dosages and ultrafine tailing contents under shear,compression,and compression-shear coupling experimental conditions were tested and *** results show that the shear yield stress under compression and compression-shear coupling increases with the growth of compressive yield stress,while the shear yield stress increases slightly under *** order of shear yield stress from low to high under different thickening conditions is shear,compression,and compression-shear *** compression and compression-shear coupling,the concentration first rapidly increases with the growth of compressive yield stress and then slowly increases,while concentration increases slightly under *** order of concentration from low to high under different thickening conditions is shear,compression,and compression-shear ***,the evolution mechanism of the flocs and drainage channels during the thickening of the thickened tailings under different experimental conditions was revealed.

关键词： thickened tailings compression-shear coupling compressive yield stress shear yield stress concentration

WNT5A Regulated by miR154-5p is Associated with Angiopoiesis and Invasion of Placental Site Trophoblastic Tumor (PSTT)

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Biomedical and Environmental Sciences 2024年第4期37卷 423-427页

作者： ZHANG Sai CHEN Zhi Xian ZHANG mo DU Yan ZHOU Jia Yi wu Jing YU Yin hua CAO Qi ZHAO Hong Bo Obstetrics and Gynecology Hospital Fudan UniversityShanghai 200011China Shanghai Key Laboratory of Female Reproductive Endocrine Related Diseases Shanghai 200011China

Placental site trophoblastic tumor(PSTT),a rare gestational trophoblastic neoplasm(GTN),exhibits slow growth,late-onset metastasis,and chemotherapy insensitivity[1,2].The invasive capacity of trophoblasts induces angiogenesis in PSTT,yet the specific mechanism remains unclear[3].PSTT is typically resistant to chemotherapy and hysterectomy stands as the primary therapeutic choice for patients with an overall cure rate of approximately 75%-80%[4,5].Therefore,investigating the precise emergence and progression of PSTT is crucial,aiming to identify novel targets for diagnosis and therapy.

关键词： chemotherapy diagnosis metastasis

Unknown system dynamics estimator-based impedance control for lower limb exoskeleton with enhanced performance

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Control Theory and Technology 2024年第1期22卷 56-68页

作者： Wenhao Zhang Peng Song Mingying wu Qiang Li Xinmin mo Pingxin Ji Northwest Institute of Mechanical and Electrical Engineering Xianyang712099ShaanxiChina Xi’an Exo-Smart Dynamics Technology Ltd. Xi’an712046ShaanxiChina Department of Mechanical and Engineering Beijing Institute of TechnologyBeijing100081China

In this article, an unknown system dynamics estimator-based impedance control method is proposed for the lower limb exoskeleton to stimulate the tracking flexibility with the terminal target position when suffering parametric inaccuracies and unexpected disturbances. To reinforce the robust performance, via constructing the filtering operation-based dynamic relation, i.e., invariant manifold, the unknown system dynamics estimators are employed to maintain the accurate perturbation identification in both the hip and knee subsystem. Besides, a funnel control technique is designed to govern the convergence process within a minor overshoot and a higher steady-state precision. Meanwhile, an interactive complaint result can be obtained with the aid of the impedance control, where the prescribed terminal trajectory can be adjusted into the interaction variable-based target position by the force–position mapping, revealing the dynamic influence between the impedance coefficient (stiffness and damping) and the adjusted position magnitude. A sufficient stability analysis verifies the ultimately uniformly bounded results of all the error signals, and even the angle errors can be regulated within the predefined funnel boundary in the whole convergence. Finally, some simulations are provided to demonstrate the validity and superiority including the enhanced interaction flexibility and robustness.

关键词： Trajectory tracking Invariant manifold Funnel control Impedance control Lower limb exoskeleton