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Stability of an explicit time-integration algorithm for hybrid tests, considering stiffness hardening behavior

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Earthquake Engineering and Engineering Vibration 2018年第3期17卷 595-606页

作者： Wang Tao Zhou Huimeng zhang xipeng Ran Tianran Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsCEA

An explicit unconditionally stable algorithm for hybrid tests,which is developed from the traditional HHT-α algorithm,is *** unconditional stability is first proven by the spectral radius method for a linear *** the value of α is selected within [-0.5,0],then the algorithm is shown to be unconditionally ***,the root locus method for a discrete dynamic system is applied to analyze the stability of a nonlinear *** results show that the proposed method is conditionally stable for dynamic systems with stiffness *** improve the stability of the proposed method,the structure stiffness is then identified and *** numerical and pseudo-dynamic tests on a structure with the collision effect prove that the stiffness updating method can effectively improve stability.

关键词： explicit integration algorithm unconditional stability HHT-α algorithm stiffness identification root locus method

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常用生物农药与莱氏绿僵菌相容性的初步研究

中国植保导刊 2024年第6期44卷 14-17,39页

作者：张希鹏武广安王煜坤刘守柱聊城大学农学与农业工程学院山东聊城252000

为探明常用生物农药与具有生防潜力的昆虫病原真菌莱氏绿僵菌Nr5772的相容性,从而为两者联合使用防治农业害虫提供依据,采用室内菌丝生长速率法测定了常用生物源杀虫剂多杀菌素、藜芦碱、苦参碱、除虫菊素、鱼藤酮、印楝素对莱氏绿僵菌... 详细信息

为探明常用生物农药与具有生防潜力的昆虫病原真菌莱氏绿僵菌Nr5772的相容性,从而为两者联合使用防治农业害虫提供依据,采用室内菌丝生长速率法测定了常用生物源杀虫剂多杀菌素、藜芦碱、苦参碱、除虫菊素、鱼藤酮、印楝素对莱氏绿僵菌的影响。结果表明,苦参碱与莱氏绿僵菌的相容性最好,前者对后者的抑制作用较弱,抑制中浓度EC_(50)为324.12mg/L;多杀菌素对莱氏绿僵菌的EC_(50)为175.83mg/L,两者相容性也较好;除虫菊素、印楝素对莱氏绿僵菌的菌丝生长具有一定抑制作用,对应的EC_(50)分别为48.57、8.99 mg/L;鱼藤酮和藜芦碱对莱氏绿僵菌的菌丝生长表现出很强的抑制作用,EC_(50)值分别为3.28 mg/L和1.68 mg/L,远低于这两种农药的田间常用浓度40 mg/L和12.5 mg/L,与莱氏绿僵菌的相容性差。由此判断,莱氏绿僵菌可与苦参碱或多杀菌素混用以提升对害虫的防效,但不适合与鱼藤酮或藜芦碱混用。

关键词：莱氏绿僵菌生物农药相容性室内毒力

A Sensing Layer Network Resource Allocation Model Based on Trusted Groups

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China Communications 2019年第10期16卷 151-173页

作者： Bei Gong xipeng zhang Shen He Nan Tian Yubo Wang Faculty of Information Technology Beijing University of TechnologyBeijing 100124China China Mobile Research Institute Beijing 100055China 91977 PLA(The People’s Liberation Army) Beijing 10000 China

There are many heterogeneous sensing nodes in the sensing layer of the Internet of Things, and the amount of data transmission is huge, which puts high requirements on the allocation of network bandwidth. At the same time, untrusted sensing nodes maliciously invade network resources. Therefore, how to confirm whether a sensing node is trusted and reasonably allocate network resources is an urgent problem to be solved. To resolve this issue, this paper proposes a sensing network resource allocation model based on trusted groups. Through the sensing node computing environment and behavior measurement, we can identify and exclude untrusted nodes, so the trusted group can be built. Then the network resources are distributed from a global perspective. Based on the available bandwidth of the link, a network resource fusion model of IPv4 and IPv6 is proposed. On this basis, a global network resource allocation model is further proposed. Afterwards, real-time monitoring of data transmission behavior ensures data security during transmission. Simulation experiments show that this mechanism can effectively optimize the bandwidth allocation in the data transmission process and has little effect on the running efficiency of existing network applications. At the same time, it can effectively guarantee the trust of nodes and achieve trusted data transmission.

关键词： internet of things trust measurement link bandwidth network resource allocation data transmission

ChatGPT: potential, prospects, and limitations

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Frontiers of Information Technology & Electronic Engineering 2024年第1期25卷 6-11页

作者： Jie ZHOU Pei KE xipeng QIU Minlie HUANG Junping zhang School of Computer Science Fudan UniversityShanghai 200433China Department of Computer Science and Technology Tsinghua UniversityBeijing 100084China Shanghai Key Laboratory of Intelligent Information Processing Shanghai 200433China

Recently,OpenAI released Chat Generative Pre-trained Transformer(ChatGPT)(Schulman et al.,2022)(https://***),which has attracted considerable attention from the industry and academia because of its impressive *** is the first time that such a variety of open tasks can be well solved within one large language *** better understand ChatGPT,we briefly introduce its history,discuss its advantages and disadvantages,and point out several potential ***,we analyze its impact on the development of trustworthy artificial intelligence,conversational search engine,and artificial general intelligence.

关键词： artificial limitations intelligence

Effect of ferrovanadium inoculation on microstructure and properties of high speed steel

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China Foundry 2008年第2期5卷 95-98页

作者： zhang xipeng Kou Guojun Wu Chunjing Gan Zhaiping Zhao Wanzi Chuan Xiangzhao Ma Ye School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Wuhan Iron and Steel Group Co. Wuhan 430083 China

The effect of ferrovanadium inoculation on the microstructure and properties of high speed steel (HSS) used for rolls was studied. The results showed that the as-cast eutectic carbide network tends to be broken after ferrovanadium inoculation, and the carbides are changed to rod-like or nodular shape. After heat treatment, the carbides in the inoculated HSS are spheroidized and distributed more uniformly in the matrix. The impact toughness of high speed steel with ferrovanadium inoculation is obviously improved. The action mechanism of ferrovanadium inoculation on the microstructure of the alloy is also discussed.

关键词： high speed steel carbides inoculation

Re-usable Cd_(0.9)Zn_(0.1)S-ZnO@C/PVDF piezo-photocatalytic film with exceptional hydrogen evolution capability triggered by the synergetic advantages of piezoelectricity and S-Scheme heterojunction

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Journal of Energy Chemistry 2024年第9期96卷 164-176页

作者： Ping Su Dong zhang Minghui Zhu Tengteng Liang Nan Yang Huaihao Zhao Dafeng zhang Junchang Liu Peiqing Cai xipeng Pu School of Materials Science and Engineering Shandong Provincial Key Laboratory of Chemical Energy Science and Novel Cell TechnologyLiaocheng UniversityLiaocheng 252000ShandongChina School of Physics Science and Information Technology Shandong Key Laboratory of Optical Communication Sciencend TechnologyLiaocheng UniversityLiaocheng 252000ShandongChina College of Optical and Electronic Technology China Jiliang UniversityHangzhou 310018ZhejiangChina

Piezoelectric materials have advantages of fine-tuning photocatalytic performance through harvesting mechanical energy and open a new avenue in facilitating green catalytic ***,polyvinylidene fluoride(PVDF),a flexible piezoelectric material,was introduced to synthesize a novel Cd_(0.9)Zn_(0.1)S-ZnO@C/PVDF(CZS-ZO@C/PVDF)piezo-photocatalytic film by spin coating and immersion phase conversion *** from the piezoelectricity of PVDF and the internal electric field(IEF)of CZS-ZO@C Step-scheme(S-Scheme)heterojunction,CZS-ZO@C/PVDF was able to induce a hydrogen generation rate of 34.9 mmol g^(−1)h^(−1)activated by ultrasound and visible light(U-L),which is∼17.5 times of Cd_(0.9)Zn_(0.1)S/PVDF(CZS/PVDF)and∼7.4 times of the photocatalysis rate activated by visible light only(L).Piezoelectric measurements and COMSOL simulation illustrated the excellent piezoelectricity of CZS-ZO@C/PVDF film,which exhibits a piezoelectric coefficient(d33)of 9.9 pm V−1 and a piezoelectric potential of 874 mV(under 0.5 MPa).The reaction mechanism for the exceptional piezo-photocatalytic performance was finally disclosed through density functional theory(DFT)calculation and electrochemical *** study enriches the application scope of piezoelectric materials in sustainable energy catalysis and provides a new direction to develop efficient piezoelectric photocatalysts.

关键词： Piezo-photocatalysis Heterojunction Cd_(0.9)Zn_(0.1)S Zno@c PVDF

Rational construction of CuFe_(2)O_(4)@C/Cd_(0.9)Zn_(0.1)S S-scheme heterojunction photocatalyst for extraordinary photothermal-assisted photocatalytic H_(2) evolution

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Journal of Energy Chemistry 2024年第5期92卷 240-249页

作者： Dong zhang Minghui Zhu Ran Qin Peixian Chen Maoye Yin Dafeng zhang Junchang Liu Hengshuai Li xipeng Pu Peiqing Cai School of Physics Science and Information Technology Shandong Key Laboratory of Optical Communication Science and TechnologyLiaocheng UniversityLiaocheng 252000ShandongChina School of Materials Science and Engineering Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell TechnologyLiaocheng UniversityLiaocheng 252000ShandongChina College of Optical and Electronic Technology China Jiliang UniversityHangzhou 310018ZhejiangChina

Rational design of photocatalyst to maximize the use of sunlight is one of the issues to be solved in photocatalysis *** this study,the CuFe_(2)O_(4)@C/Cd_(0.9)Zn_(0.1)S(CFO@C/CZS)S-scheme photocatalyst with photothermal effect was synthesized by ultrasonic self-assembly combined with *** dark CFO@C absorbed visible light and partly converted into heat to promote the hydrogen evolution *** presence of heterojunctions inhibited the photogenerated electron-hole *** graphite-carbon layer provided a stable channel for electron transfer,and the presence of magnetic CFO made recycle *** the action of photothermal assistance and heterojunction,the hydrogen evolution rate of the optimal CFO@C/CZS was 80.79 mmol g^(-1) h^(-1),which was 2.55 times and 260.61 times of that of pure CZS and CFO@C,***,the composite samples also exhibit excellent stability and a wide range of environmental *** experimental tests and first-principles simulation calculation methods,the plausible mechanism of photoactivity enhancement was *** work provided a feasible strategy of photothermal assistance for the development of heterojunction photocatalysts with distinctive hydrogen evolution.

关键词： Photothermal effect S-scheme heterojunction Photocatalytic hydrogen evolution First-principles calculations

Advancing insights into in vivo meningeal lymphatic vessels with stereoscopic wide-field photoacoustic microscopy

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Light(Science & Applications) 2024年第5期13卷 894-907页

作者： Fei Yang Zhiyang Wang Wenbin Shi Miao Wang Rui Ma Wuyu zhang xipeng Li Erqi Wang Wenjie Xie Zhan zhang Qi Shen Feifan Zhou Sihua Yang MOE Key Laboratory of Laser Life Science&Institute of Laser Life Science South China Normal UniversityGuangzhou 510631China. Guangdong Provincial Key Laboratory of Laser Life Science College of BiophotonicsSouth China Normal UniversityGuangzhou 510631China. Key Laboratory of Biomedical Engineering of Hainan Province School of Biomedical EngineeringHainan UniversityHaikou 570100China. Department of Neurology Sun Yatsen Memorial HospitalSun Yat-sen UniversityGuangzhou 510120China. Guangdong Province Key Laboratory of Brain Function and Disease Zhongshan School of MedicineSun Yat-sen UniversityGuangzhou 510120China. Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter South China Normal UniversityGuangzhou 510006China

Meningeal lymphatic vessels(mLVs)play a pivotal role in regulating metabolic waste from cerebrospinal fluid(CSF).However,the current limitations in field of view and resolution of existing imaging techniques impede understanding the stereoscopic morphology and dynamic behavior of mLVs in ***,we utilized dual-contrast functional photoacoustic microscopy to achieve wide-field intravital imaging of the lymphatic system,including mLVs and glymphatic *** stereoscopic photoacoustic microscopy based on opto-acoustic confocal features has a depth imaging capability of 3.75 mm,facilitating differentiation between mLVs on the meninges and glymphatic pathways within the brain ***,using this imaging technique,we were able to visualize the dynamic drainage of mLVs and identify a peak drainage period occurring around 20–40 min after injection,along with determining the flow direction from CSF to lymph ***,in the Alzheimer’s disease(AD)mouse model,we observed that AD mice exhibit a~70%reduction in drainage volume of mLVs compared to wild-type *** the development of AD,there is be continued decline in mLVs drainage *** finding clearly demonstrates that the AD mouse model has impaired CSF *** study opens up a horizon for understanding the brain’s drainage mechanism and dissecting mLVs-associated neurological disorders.

关键词： lymphatic impaired field

Stackelberg博弈在电力市场中的应用研究综述

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电工技术学报 2022年第13期37卷 3250-3262页

作者：张衡张沈习程浩忠张希鹏谷青发电力传输与功率变换控制教育部重点实验室(上海交通大学) 上海200240 国网上海市电力公司市北供电公司上海200070 国网河南省电力公司电力科学研究院郑州450052

可再生能源并网常态化、储能投资商业化、需求侧管理多样化、多能互补成熟化等在电力系统源、网、荷侧引入的利益主体不断增多,而受自身规模、所处市场地位不同造成了决策次序的差异性。针对电力市场环境下电力系统投资、交易等环节中... 详细信息

可再生能源并网常态化、储能投资商业化、需求侧管理多样化、多能互补成熟化等在电力系统源、网、荷侧引入的利益主体不断增多,而受自身规模、所处市场地位不同造成了决策次序的差异性。针对电力市场环境下电力系统投资、交易等环节中普遍存在的次序决策问题,该文以具有主从递阶结构的Stackelberg博弈理论为切入点,综述了其在电力市场中的应用情况。首先,阐述了Stackelberg博弈理论的数学结构,并根据主/从问题中博弈者的数量进行了分类;然后,梳理了Stackelberg博弈在电力市场中的典型应用,总结了模型对等转换技巧,归纳了各类求解方法及其优缺点;最后,提炼了Stackelberg博弈理论在电力市场应用中仍然存在的关键问题。该文为处于不同决策位置的利益主体参与电力市场竞争提供了参考。

关键词：博弈论 Stackelberg博弈主从博弈电力市场电力系统优化