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A hybrid multidimensional Riemann solver to couple self-similar method with MULTV method for complex flows

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Chinese Journal of Aeronautics 2021年第7期34卷 29-38页

作者： Feng QU Di SUN junjie fu Junqiang BAI School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072China

Since proposed,the self-similarity variables based genuinely multidimensional Riemann solver is attracting more attentions due to its high resolution in multidimensional complex ***,it needs numerous logical operations in supersonic cases,which limit the method’s applicability in engineering problems *** order to overcome this defect,a hybrid multidimensional Riemann solver,called HMTHS(Hybrid of MulTv and multidimensional HLL scheme based on Self-similar structures),is *** simulates the strongly interacting zone by adopting the MHLLES(Multidimensional Harten-Lax-van Leer-Eifeldt scheme based on Self-similar structures)scheme at subsonic speeds,which is with a high resolution by considering the second moment in the similarity ***,it adopts the MULTV(Multidimensional Toro and Vasquez)scheme,which is with a high resolution in capturing discontinuities,to simulate the flux at supersonic *** numerical experiments,including both one-dimensional cases and twodimensional cases,are ***-dimensional moving contact discontinuity case and sod shock tube case suggest that HMTHS can accurately capture one-dimensional expansion waves,shock waves,and linear contact ***-dimensional cases,such as the double Mach reflection case,the supersonic shock/boundary layer interaction case,the hypersonic flow over the cylinder case,and the hypersonic viscous flow over the double-ellipsoid case,indicate that the HMTHS scheme is with a high resolution in simulating multidimensional complex ***,it is promising to be widely applied in both scholar and engineering areas.

关键词： Complex flows Computational fluid dynamics Multidimensional Riemann solver Self-similar

Robust adaptive time-varying region tracking control of multi-robot systems

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Science China(Information Sciences) 2023年第5期66卷 291-292页

作者： junjie fu Yuezu LV Wenwu YU Jiangsu Key Laboratory of Networked Collective Intelligence School of Mathematics Southeast University

Dear editor,Multi-robot systems have been employed in more and more areas in recent years due to their high efficiency, low cost and impressive robustness. When the number of agents is large, efective control of the multi-agent systems becomes a challenging problem due to the infeasibility of centralized control. One promising strategy is to control only the shape of the system instead of the precise relative positions of the robots [1].

关键词： Multipurpose robots

Short-term power load forecasting using integrated methods based on long short-term memory

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Science China(Technological Sciences) 2020年第4期63卷 614-624页

作者： ZHANG WenJie QIN Jian MEI Feng fu junjie DAI Bo YU WenWu State Grid Zhejiang Electric Power Corporation Information and Telecommunication Branch Hangzhou 310007China Jiangsu Provincial Key Laboratory of Networked Collective Intelligence School of MathematicsSoutheast UniversityNanjing 210096China

The development of power system informatization,the massive access of distributed power supply and electric vehicles have increased the complexity of power consumption in the distribution network,which puts forward higher requirements for the accuracy and stability of load *** this paper,an integrated network architecture which consists of the self-organized mapping,chaotic time series,intelligent optimization algorithm and long short-term memory(LSTM)is proposed to extend the load forecasting length,decrease artificial debugging,and improve the prediction precision for the short-term power load *** with LSTM prediction,the algorithm in this paper improves the prediction accuracy by 61.87%in terms of root mean square error(RMSE),and reduces the prediction error by 50%in the 40-fold forecast window under some circumstances.

关键词： long short-term memory chaotic time series intelligent optimization integrated network architecture

Dynamical economic dispatch using distributed barrier function-based optimization algorithm

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Science China(Technological Sciences) 2019年第12期62卷 2104-2112页

作者： YAO YiYang TIAN FangZheng MEI Feng fu junjie DAI Bo YU WenWu State Grid Zhejiang Electric Power Corporation Information&Telecommunication Branch Hangzhou 310007China School of Mathematics Southeast UniversityNanjing 210096China

In this paper, we study the distributed economic dispatch problem where the supply demand balance, capacity constraints and ramp-rate constraints are considered. In order to accommodate varying power load and power storage in reality, we introduce two variables where each variable is time-varing and has its own dynamics. The renewable power is also considered. Barrier functions are introduced to deal with the local constraints by means of imposing penalty terms into the objective function to ensure that the optimal solution satisfies the corresponding constraints. Based on the Langrange dual theory, the primal optimization problem is transformed into the dual problem, which is solved by the primary-dual algorithm proposed in this paper. Under the assumption that the communication graph is an undirected and connected graph, we analyze the convergence of the proposed algorithm. The simulations on IEEE six-bus test systems are carried out to verify the performance of the algorithm, which shows that the proposed algorithm converges to the optimal solution, while all the constraints are met.

关键词： multi-agent systems distributed optimization barrier function Langrange function

Study on the rapid detection of irradiated rice based on RVA

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Nuclear Science and Techniques 2013年第B12期24卷 58-62页

作者： fu junjie ZHOU Xinyao FENG Duhua WANG Qing DENG Li Zhejiang institute of Nuclear-Agricultural Sciences Hangzhou 310029 China The center of biotechnology of Wuxi and Zhejiang University Wuxi 214105 China

In this paper, the changes of rice-starch's viscosity at different dose irradiation treatment were studied, the rice can be easily distinguished whether it has been irradiated or not with the control of pH. The results showed that the starch's viscosity was significantly declined with increasing irradiation absorb dose. With the control of pH 2.5, the irradiated starch's viscosity was apparently higher than the un-irradiated ones, there are significant differences in terms of viscosity between the two parts. The rice absorbed dose can be estimated using the relationship among peak viscosity, hot pasting viscosity and absorbed dose. © 2013, Science Press. All rights reserved.

关键词：辐照处理快速检测水稻 RVA 吸收剂量大米淀粉高粘度 pH值

Xenopus GLP-1-based glycopeptides as dual glucagon-like peptide 1 receptor/glucagon receptor agonists with improved in vivo stability for treating diabetes and obesity

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Chinese Journal of Natural Medicines 2022年第11期20卷 863-872页

作者： LI Qiang YANG Qimeng HAN Jing LIU Xiaohan fu junjie YIN Jian Key Laboratory of Carbohydrate Chemistry and Biotechnology Ministry of EducationSchool of BiotechnologyJiangnan UniversityWuxi 214122China School of Chemistry and Materials Science Jiangsu Normal UniversityXuzhou 221116China Key Laboratory of Early Prevention and Treatment for Regional High Frequency Tumor Ministry of EducationGuangxi Key Laboratory of Early Prevention and Treatment for Regional High Frequency TumorGuangxi Medical UniversityNanning 530021China

Peptide dual agonists toward both glucagon-like peptide 1 receptor(GLP-1R)and glucagon receptor(GCGR)are emerging as novel therapeutics for the treatment of type 2 diabetes mellitus(T2DM)patients with *** previous work identified a Xenopus GLP-1-based dual GLP-1R/GCGR agonist termed xGLP/GCG-13,which showed decent hypoglycemic and body weight lowering ***,the clinical utility of xGLP/GCG-13 is limited due to its short in vivo *** by the fact that O-GlcNAcylation of intracellular proteins leads to increased stability of secreted proteins,we rationally designed a panel of O-GlcNAcylated xGLP/GCG-13 analogs as potential long-acting GLP-1R/GCGR dual *** of the synthesized glycopeptides 1f was found to be equipotent to xGLP/GCG-13 in cell-based receptor activation *** expected,O-GlcNAcylation effectively improved the stability of xGLP/GCG-13 in ***,chronic administration of 1f potently induced body weight loss and hypoglycemic effects,improved glucose tolerance,and normalized lipid metabolism and adiposity in both db/db and diet induced obesity(DIO)mice *** results supported the hypothesis that glycosylation is a useful strategy for improving the in vivo stability of GLP-1-based peptides and promoted the development of dual GLP-1R/GCGR agonists as antidiabetic/antiobesity drugs.

关键词： Glucagon-like peptide-1 Glucagon Diabetes Obesity O-GlcNAcylation

Preparation of copper nano-particle powder by γ-irradiation

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Nuclear Science and Techniques 2012年第3期23卷 163-168页

作者： fu junjie LIU Yajian TAN Yuanyuan ZHOU Xinyao XU furong Institute of Nuclear Agricultural Sciences Zhejiang University Hangzhou 310021 China Energy and Nuclear Technology Application Institute Hangzhou 310012 China

Copper nano-particles were prepared by 100 kGy room temperature γ-ray irradiation of CuSO4 aqueous solution added with surfactant and inactive *** of the surfactants and pH value on particle size and morphology of the Cu powder,and the storage stability,were ***,morphology,particle size and melting point of the copper nano-particles were characterized by X-ray diffraction(XRD),transmission electron microscopy(TEM),laser particle size analyzer and differential scanning calorimetry(DSC),*** results show that the Cu nano-particles prepared with PCM as surfactant and N,N-bis-hydroxyethyl dodecyl amide as inactive agent,in pH=4.0-6.5 of the aqueous solution,can be stored in air for 140 days.

关键词：铜纳米颗粒制备粉末表面活性剂铜纳米粒子透射电子显微镜差示扫描量热法激光粒度分析仪

Study on rapid detection of irradiated rice based on RVA profile

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Nuclear Science and Techniques 2013年第4期24卷 32-37页

作者： MEI Shufang fu junjie ZHOU Xiyao XU furong ZHAO Xiaojun Institute of Nuclear Agricultural Sciences Zhejiang University Jinhua Polytechnic College

In order to confirm whether the rice sample was exposed to gamma radiation,the changes in starch pasting viscosity of rice irradiated by different absorbed doses with additive acid solution and distilled water were *** peak viscosity of irradiated rice sample was significantly decreased with the increment of absorbed doses even for the samples stored over 360 *** samples can be distinguished from non-irradiated samples by their RVA profile as in the acid solution(pH=2.5),the starch pasting viscosities of irradiated rice samples were apparently higher while the starch pasting viscosities of non-irradiated rice samples were lower than that in distilled water(pH=7.0).The irradiation absorbed dose can be estimated accurately by the regression equation constructed with peak viscosity and absorbed doses.

关键词： RVA谱大米辐照快速检测峰值粘度吸收剂量淀粉糊化回归方程

DTDE:A new cooperative multi-agent reinforcement learning framework

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The Innovation 2021年第4期2卷 72-73页

作者： Guanghui Wen junjie fu Pengcheng Dai Jialing Zhou Department of Systems Science School of MathematicsSoutheast UniversityNanjing 210096China School of Automation Nanjing University of Science and TechnologyNanjing 210094China

A significant body of work on reinforcement learning has been focused on the single-agent tasks where the agent aims to learn a policy thatmaximizes the cumulative reward in a dynamic environment.1 In the past decades,quite a few single-agent-based reinforcement learning algorithms have been developed in the literature.1 Yet,it is increasingly recognized that the single-agentbased reinforcement learning algorithms may fail to effectively handle largescale optimization(decision)tasks with joint features.

关键词： agent handle learning