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A Class Hermite Pseudospectral Approximate with ω(x) ≡ 1 and Application to Reaction-diffusion Equation

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Acta Mathematicae Applicatae Sinica 2010年第3期26卷 405-414页

作者： Xin-min xiang School of Mathematics and Sciences Shanghai Normal University Shanghai 200234 China

In this paper, we continue the discussion of [12] to establish the Hermite pseudospectral method with weight ω（x） = 1. As an application, we consider the pseudospectral approximation of the reaction-diffusion equation on the whole line, we prove the existence of the approximate attractor and give the error estimate for the approximate solution.

关键词： Hermite pseudospectral method Hermite function system which the weight is 1 Reaction-diffusionequation Global attractor Error estimate

A Partial First-Order Affine-Scaling Method

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Acta Mathematica Sinica,English Series 2019年第1期35卷 1-16页

作者： Ran gu Ya xiang YUAN Academy of Mathematics and Systems Science Chinese Academy of Sciences

We present a partial first-order affine-scaling method for solving smooth optimization with linear inequality constraints. At each iteration, the algorithm considers a subset of the constraints to reduce the complexity. We prove the global convergence of the algorithm for general smooth objective functions, and show it converges at sublinear rate when the objective function is quadratic. Numerical experiments indicate that our algorithm is efficient.

关键词： Linear inequality constraints affine scaling interior point

Adversarial data splitting for domain generalization

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Science China(Information Sciences) 2024年第5期67卷 28-42页

作者： xiang gu Jian SUN Zongben XU School of Mathematics and Statistics Xi'an Jiaotong University

Domain generalization aims to learn a model that is generalizable to an unseen target domain,which is a fundamental and challenging task in machine learning for out-of-distribution generalization. This paper proposes a novel domain generalization approach that enforces the learned model to be able to generalize well over the train/val subset splitting of the training dataset. This idea is modeled herein as an adversarial data splitting framework, formulated as a min-max optimization problem inspired by the metalearning approach. The min-max optimization problem is solved by iteratively splitting the training dataset into the training and val subsets to maximize the domain shift measured by the objective function and updating the model parameters to enable the model to generalize well from the training subset to the val subset by minimizing the objective function. This adversarial training approach does not assume the known domain labels of the training data; instead, it automatically investigates the “hard” splitting of the train/val subsets to learn the generalizable model. Extensive experimental results using three benchmark datasets demonstrate the superiority of this approach. In addition, we derive a generalization error bound for the theoretical understanding of our proposed approach.

关键词： domain generalization adversarial learning data splitting meta-learning out of distribution

Enabling structural and interfacial stability of 5 V spinel LiNi0.5Mn1.5O4 cathode by a coherent interface

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Journal of Energy Chemistry 2023年第1期76卷 266-276,I0007页

作者： min Xu ming Yang minfeng Chen Lanhui gu Linshan Luo Songyan Chen Jizhang Chen Bo Liu xiang Han College of Materials Science and Engineering Co-Innovation Center of Efficient Processing and Utilization of Forest ResourcesNanjing Forestry UniversityNanjing 210037JiangsuChina College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060GuangdongChina College of Mathematics and Physics Jingangshan UniversityJi'an 343009JiangxiChina Department of Physics Jiujiang Research Institute Xiamen UniversityXiamen 361005FujianChina

Spinel LiNi_(0.5)Mn_(1.5)O_(4)(LNMO),a 5 V class high voltage cathode,has been regarded as an attractive candidate to further improve the energy density of lithium-ion *** issue simultaneously enabling side stability and maintaining high interfacial kinetics,however,has not yet been ***,we design a coherent Li_(1.3)A_(l0.3)Ti_(1.7)(PO)_(4)(LATP)layer that is crystally connected to the spinel LNMO host lattices,which offers fast lithium ions transportation as well as enhances the mechanical stability that prevents the particle ***,the inactive Li_(3)BO_(3)(LBO)coating layer inhibits the corrosion of transition metals and continuous side ***,the coherent-engineered LNMO-LATPLBO cathode material exhibits superior electrochemical cycling stability in a window of 3.0–5.0 V,for example a high-capacity retention that is 89.7%after 500 cycles at 200 m A g-1obtained and enhanced rate performance(85.1 m A h g^(-1)at 800 m A g^(-1))when tested with a LiPF6-based carbonate *** work presents a new approach of engineering 5 V class spinel oxide cathode that combines interfacial coherent crystal lattice design and surface coating.

关键词： Lithium-ion battery Spinel cathode LATP Coherent interface

Forkhead box M1 transcription factor:a novel target for pulmonary arterial hypertension therapy

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World Journal of Pediatrics 2020年第2期16卷 113-119页

作者： Li gu Han-min Liu Department of Pediatric Pneumology West China Second University HospitalSichuan UniversityChengduChina Key Laboratory of Birth Defects and Related Diseases of Women and Children(Sichuan University) Ministry of EducationWest China Second University HospitalSichuan UniversityNo.20Section 3Renmin South RoadWuhou DistrictChengduChina

Background Forkhead box M1(FoxM1),a member of forkhead family,plays a key role in carcinogenesis,progression,invasion,metastasis and drug *** on the similarities between cancer and pulmonary arterial hypertension,studies on the roles and mechanisms of FoxM1 in pulmonary arterial hypertension have been *** article aims to review recent advances in the mechanisms of signal transduction associated with FoxM1 in pulmonary arterial *** sources Articles were retrieved from PubMed and MEDLINE published after 1990,including-but not limited to FoxM1 and pulmonary arterial *** FoxM 1 is overexpressed in pulmonary artery smooth muscle cells in both pulmonary arterial hypertension patients and animal models,and promotes pulmonary artery smooth muscle cell proliferation and inhibits cell apoptosis via regulating cell cycle *** signaling molecules and pathways,including hypoxia-inducible factors,transforming growth factor-β/Smad,SET domain-containing 3/vascular endothelial growth factor,survivin,cell cycle regulatory genes and DNA damage response network,are reported to cross talk with FoxM1 in pulmonary arterial *** inhibitors are effective in the prevention and treatment of pulmonary arterial hypertension by inhibiting the expression and transcriptional activity of *** FoxM1 has a crucial role in the pathogenesis of pulmonary arterial hypertension and may represent a novel therapeutic *** more details of interaction between FoxM1 and other signaling pathways need to be clarified in the future.

关键词： Forkhead box M1 Proteasome inhibitor Pulmonary arterial hypertension Signaling pathway

Chemical Vapor Deposition of Two-Dimensional PbS Nanoplates for Photodetection

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Chinese Physics Letters 2020年第4期37卷 135-139页

作者： Yi-Yi gu Yi-Fan Wang ling Xia xiang-min Meng Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190 Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049

Non-layered two-dimensional(2D)lead sulfide(PbS)has attracted growing interest recently due to its direct narrow bandgap(0.4 eV)and broad spectral detection from visible to mid-IR region,which lead to remarkable electronic and optoelectronic properties promising for real *** report the chemical vapor deposition growth of highly crystalline 2D PbS crystals on mica *** high quality and uniformity of 2D PbS nanoplates are confirmed by atomic force microscopy,x-ray powder diffraction,transmission electron microscopy and x-ray photoelectron *** morphology and lateral size are controllable by different growth *** made from 2D PbS nanoplates reveal good stability,high photoresponsivity,and fast response time,which indicates their promising applications for ultrathin optoelectronics.

关键词： spectroscopy. plates crystalline

Theoretical and numerical simulation study on jet formation and penetration of different liner structures driven by electromagnetic pressure

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Defence Technology（防务技术） 2021年第3期17卷 846-858页

作者： Jian-hao Dou Xin Jia Zheng-xiang Huang Xiao-hui gu Ying-min Zheng Bin Ma Qiang-qiang Xiao School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing210094JiangsuChina

The use of a shaped liner driven by electromagnetic force is a new means of forming jets. To study the mechanism of jet formation driven by electromagnetic force, we considered the current skin effect and the characteristics of electromagnetic loading and established a coupling model of "ElectriceMagnetic eForce" and the theoretical model of jet formation under electromagnetic force. The jet formation and penetration of conical and trumpet liners have been calculated. Then, a numerical simulation of liner collapse under electromagnetic force, jet generation, and the stretching motion were performed using an ANSYS multiphysics processor. The calculated jet velocity, jet shape, and depth of penetration were consistent with the experimental results, with a relative error of less than 10%. In addition, we calculated the jet formation of different curvature trumpet liners driven by the same loading condition and obtained the influence rule of the curvature of the liner on jet formation. Results show that the theoretical model and the ANSYS multiphysics numerical method can effectively calculate the jet formation of liners driven by electromagnetic force, and in a certain range, the greater the curvature of the liner is, the greater the jet velocity is.

关键词： Electromagnetic field Shaped charge jet formation Theoretical calculation Numerical simulation

Adaptive Simplified Chicken Swarm Optimization Based on Inverted S-Shaped Inertia Weight

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Chinese Journal of Electronics 2022年第2期31卷 367-386页

作者： gu Yanchun LU Haiyan xiang Lei SHEN Wanqiang School of Science Jiangnan University Wuxi Engineering Technology Research Center for Biological Computing Jiangnan University

Considering the issues of premature convergence and low solution accuracy in solving high-dimensional problems with the basic chicken swarm optimization algorithm, an adaptive simplified chicken swarm optimization algorithm based on inverted S-shaped inertia weight(ASCSO-S) is proposed. Firstly, a simplified chicken swarm optimization algorithm is presented by removing all the chicks from the chicken swarm. Secondly, an inverted S-shaped inertia weight is designed and introduced into the updating process of the roosters and hens to dynamically adjust their moving step size and thus to improve the convergence speed and solution accuracy of the algorithm. Thirdly, in order to enhance the exploration ability of the algorithm, an adaptive updating strategy is added to the updating process of the *** experiments on 21 classical test functions show that ASCSO-S is superior to the other comparison algorithms in terms of convergence speed, solution accuracy, and solution stability. In addition, ASCSO-S is applied to the parameter estimation of Richards model, and the test results indicate that ASCSO-S has the best fitting results compared with other three algorithms.

关键词： particle swarm optimisation solution stability adaptive simplified chicken swarm optimization algorithm parameter estimation Richards model solution accuracy swarm intelligence inverted S-shaped inertia weight convergence speed adaptive updating strategy convergence updating process ASCSO-S

Edge-cloud Computing Systems for Smart Grid: State-of-the-art, Architecture, and Applications

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Journal of Modern Power Systems and Clean Energy 2022年第4期10卷 805-817页

作者： Junlong Li Chenghong gu Yue xiang Furong Li Department of Electronic and Electrical Engineering University of BathBathUK College of Electrical Engineering Sichuan UniversityChengduChina

The quantity and heterogeneity of intelligent energy generation and consumption terminals in the smart grid are increasing drastically over the *** edge devices have created significant pressures on cloud computing(CC)system and centralised control for data storage and processing in realtime operation and *** integration of edge computing(EC)can effectively alleviate the pressure and conduct real-time processing while ensuring data *** paper conducts an extensive review of the EC-CC computing system and its application to the smart grid,which will integrate a vast number of dispersed *** first comprehensively describes the relationship among CC,fog computing(FC),and EC to provide a theoretical basis for the *** then introduces the architecture of the EC-CC computing system in the smart grid,where the architecture consists of both hardware structure and software platforms,and key technologies are introduced to support ***,the application to the smart grid is discussed across the whole supply chain,including energy generation,transportation(transmission and distribution networks),and ***,future research opportunities and challenges of EC-CC while being applied to the smart grid are *** paper can inform future research and industrial exploitations of these new technologies to enable a highly efficient smart grid under decarbonisation,digitalisation,and decentralisation transitions.

关键词： Smart grid edge computing fog computing cloud computing Internet of Things data fusion container technology