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Active Full-Vehicle Suspension Control via Cloud-Aided Adaptive Backstepping Approach

IEEE TRANSACTIONS ON CYBERNETICS 2020年第7期50卷 3113-3124页

作者： Zheng, Xiaoyuan zhang, Hao Yan, Huaicheng Yang, fuwen Wang, Zhuping Vlacic, Ljubo Tongji Univ Dept Control Sci & Engn Shanghai 200092 Peoples R China East China Univ Sci & Technol Key Lab Adv Control & Optimizat Chem Proc Minist Educ Shanghai 200237 Peoples R China Hubei Normal Univ Coll Mechatron & Control Engn Huangshi 435002 Hubei Peoples R China Griffith Univ Sch Engn Gold Coast Qld 4222 Australia

This paper is concerned with the adaptive backstepping control problem for a cloud-aided nonlinear active full-vehicle suspension system. A novel model for a nonlinear active suspension system is established, in which uncertain parameters, unknown friction forces, nonlinear springs and dampers, and performance requirements are considered simultaneously. In order to deal with the nonlinear characteristics, a backstepping control strategy is developed. Meanwhile, an adaptive control strategy is proposed to handle the uncertain parameters and unknown friction forces. In the cloud-aided vehicle suspension system framework, the adaptive backstepping controller is updated in a remote cloud based on the cloud storing information, such as road information, vehicle suspension information, and reference trajectories. Finally, simulation results for a full vehicle with 7-degree of freedom model are provided to demonstrate the effectiveness of the proposed control scheme, and it is shown that the addressed controller can improve the performances more than 80% compared with passive vehicle suspension systems.

关键词： Suspensions (mechanical systems) Backstepping Cloud computing Roads Adaptation models Adaptive systems Springs Adaptive backstepping control full active suspension system remote cloud wireless network

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Exciton Binding Energy of Non-Fullerene Electron Acceptors

ADVANCED ENERGY AND SUSTAINABILITY RESEARCH

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ADVANCED ENERGY AND SUSTAINABILITY RESEARCH 2022年第4期3卷

作者： Zhu, Yufan Zhao, fuwen Wang, Wei Li, Yawen zhang, Shiming Lin, Yuze Nanjing Tech Univ Key Lab Flexible Elect KLOFE Nanjing 211816 Jiangsu Peoples R China Nanjing Tech Univ Inst Adv Mat IAM Jiangsu Natl Synerget Innovat Ctr Adv Mat SICAM Nanjing 211816 Jiangsu Peoples R China Chinese Acad Sci Beijing Natl Lab Mol Sci CAS Key Lab Organ Solids Inst Chem Beijing 100190 Peoples R China Cent South Univ State Key Lab Powder Met Changsha 410083 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China

The past three years have witnessed the power conversion efficiency (PCE) of organic solar cells (OSCs) rocketing to over 18%, due to outstanding advantages of non-fullerene acceptors (NFAs). However, large exciton binding energy (E (b)) caused by strong Coulombic force is still one of the main limiting factors for high-performance OSCs. Thus, it is critical to reduce the E (b) for further enhancement of device performance. Many strategies have been developed to reduce the E (b) of organic materials previously. In this perspective, the calculation methods for E (b) and the relationship between E (b) and voltage loss (V (loss)) are discussed. Then, the effects of the properties of small-molecule acceptors on E (b) from the perspectives of fused-ring donor cores, end groups, side chains, and molecular packing are discussed. Finally, the potential directions for reducing E (b) and pointing out the trade-off between E (b) and bandgaps/miscibility are put forward. It is hoped that this perspective could provide a new thinking of a molecular design for the breakthrough of OSCs.

关键词： exciton binding energy fused-ring electron acceptors non-fullerene acceptors organic photovoltaics organic solar cells

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Distributed Event-Triggered Estimation Over Sensor Networks: A Survey

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IEEE TRANSACTIONS ON CYBERNETICS 2020年第3期50卷 1306-1320页

作者： Ge, Xiaohua Han, Qing-Long zhang, Xian-Ming Ding, Lei Yang, fuwen Swinburne Univ Technol Sch Software & Elect Engn Hawthorn Vic 3122 Australia Nanjing Univ Posts & Telecommun Inst Adv Technol Nanjing 210023 Peoples R China Griffith Univ Griffith Sch Engn Gold Coast Qld 4222 Australia

An event-triggered mechanism is of great efficiency in reducing unnecessary sensor samplings/transmissions and, thus, resource consumption such as sensor power and network bandwidth, which makes distributed event-triggered estimation a promising resource-aware solution for sensor network-based monitoring systems. This paper provides a survey of recent advances in distributed event-triggered estimation for dynamical systems operating over resource-constrained sensor networks. Local estimates of an unavailable state signal are calculated in a distributed and collaborative fashion based on only invoked sensor data. First, several fundamental issues associated with the design of distributed estimators are discussed in detail, such as estimator structures, communication constraints, and design methods. Second, an emphasis is laid on recent developments of distributed event-triggered estimation that has received considerable attention in the past few years. Then, the principle of an event-triggered mechanism is outlined and recent results in this subject are sorted out in accordance with different event-triggering conditions. Third, applications of distributed event-triggered estimation in practical sensor network-based monitoring systems including distributed grid-connected generation systems and target tracking systems are provided. Finally, several challenging issues worthy of further research are envisioned.

关键词： Estimation Monitoring Sensors Reliability Smart grids Information processing Germanium Attack detection communication constraint distributed estimation event-triggered mechanism islanding detection secure estimation sensor networks set-membership filtering target tracking

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Synergistic passivation effects of nitrogen plasma and oxygen plasma on improving the interface quality and bias temperature instability of 4H-SiC MOS capacitors

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APPLIED SURFACE SCIENCE 2020年 513卷 145837-000页

作者： Yang, Chao Yin, Zhipeng zhang, Fanglong Su, Yan Qin, fuwen Wang, Dejun Dalian Univ Technol Fac Elect Informat & Elect Engn Sch Control Sci & EngnMinist Educ Key Lab Intelligent Control & Optimizat Ind Equip Dalian 116024 Peoples R China Dalian Univ Technol Minist Educ State Key Lab Mat Modificat Laser Ion & Electron Dalian 116024 Peoples R China

Interface properties and bias temperature instability (BTI) determine the performance and stability of SiC metaloxide semiconductor (MOS) devices. In this work, we propose an electron cyclotron resonance microwave nitrogen-oxygen (N-O) mixed plasma post-oxidation annealing (POA) process to improve the interface properties and BTI of 4H-SiC MOS capacitors. Results showed that the N-O mixed plasma POA reduces the density of interface traps, maintains the stability of the flat band voltage (V-fb) hysteresis under four successive cycles of positive bias temperature stress (PBTS) and negative bias temperature stress (NBTS) at 423 K, and significantly reduces the V(fb )hysteresis under alternating PBTS and NBTS at 100 K. The oxide traps remarkably decreased to 2.27 x 10(12) cm(-2) after N-O mixed plasma POA. The related passivation and improvement mechanisms were further studied by secondary ion mass spectroscopy, X-ray photoelectron spectroscopy, and density functional theory calculations. The synergistic effects of highly reactive N and O plasma promoted the considerable absorption of N at the interface and prevented further oxidation of the SiC substrate. We also elaborate on the effects of N, O, and N-O plasma on the elimination and passivation of O vacancy defects, C-related defects (SiOxCy and C dimer), and Si interstitial defects and discuss implications of the simultaneous suppression of electron and hole trapping.

关键词： 4H-SiC MOS capacitor Density of interface traps Bias temperature instability Synergistic effects Post-oxidation annealing

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Qingdai Decoction suppresses prostate cancer growth in lethal-stage prostate cancer models

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JOURNAL OF ETHNOPHARMACOLOGY 2023年 308卷 116333页

作者： Chen, Yanhua Zhou, Qianqian zhang, Hong Xu, Linfan Lu, Lianheng Shu, Bing Zhou, Lihong Yuan, fuwen Shanghai Univ Tradit Chinese Med Acad Integrat Med Shanghai 201203 Peoples R China Shanghai Univ Tradit Chinese Med Longhua Hosp 725 Wan Ping South Rd Shanghai 200032 Peoples R China Anhui Med Univ Affiliated Hosp 1 Dept Urol Hefei Anhui Peoples R China Shanghai Univ Tradit Chinese Med Shuguang Hosp Dept Med Oncol Shanghai 201203 Peoples R China

Ethnopharmacological relevance: Contemporary therapy for advanced castration-resistant prostate cancer (CRPC) employs reagents such as enzalutamide and abir-aterone acetate targeting the androgen receptor (AR) transcription axis only provide a temporary response and rapidly develop resistance. Additionally, neuroen-docrine prostate cancer (NEPC) is an AR pathway-independent and lethal-stage prostate cancer with no standard therapy. Qingdai Decoction (QDT), a traditional Chinese medicine formula, has various pharmacological activities and was widely used for the treatment of different diseases including prostatitis which may contribute to prostate cancer *** of the study: This study aims to explore the anti-tumor role and potential mechanism of QDT on prostate *** and methods: CRPC prostate cancer cell models and xenograft mice models were established for research. The effect of TCMs on cancer growth and metastasis were determined by CCK-8, wound-healing assays and the PC3-xenografted mice model. The toxicity of QDT in the major organs was investigated by H&E staining. The compound-target network was analyzed with network pharmacology. The correlation of QDT targets with prostate cancer patient's prognosis was analyzed with multiple prostate cancer patient cohorts. The expression of related proteins and mRNA were detected by western blot and real-time PCR. The gene knockdown was achieved with CRISPR-Cas13 ***: By integrating functional screening, network pharmacology analysis, CRISPR-Cas13 directed RNA targeting, and molecular biology validation in different prostate cancer models and clinical prostate cancer cohorts, we found that Qingdai Decoction (QDT), a Traditional Chinese Medicine, can repress cancer growth in advanced prostate cancer models in vitro and in vivo in an AR independent manner by targeting NOS3, TGFB1, and ***: This study not only identified QDT as a novel drug for lethal-stage prostate cancer tre

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Toxicological assessment and underlying mechanisms of tetrabromobisphenol A exposure on the soil nematode Caenorhabditis elegans

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CHEMOSPHERE 2020年 242卷 125078页

作者： Liu, fuwen zhang, Ying zhang, Meng Luo, Qishi Cao, Xue Cui, Changzheng Lin, Kuangfei Huang, Kai East China Univ Sci & Technol Sch Resource & Environm Engn State Environm Protect Key Lab Environm Risk Asse Shanghai 200237 Peoples R China Yonker Environm Protect Co Ltd Branch Shanghai Shanghai 200051 Peoples R China

The widespread use of tetrabromobisphenol A (TBBPA) in industries has resulted in its frequent detection in environmental matrices, and the mechanisms of its associated hazards need further investigation. In this study, the nematode Caenorhabditis elegans (C elegans) was exposed to environmentally relevant concentrations of TBBPA (0, 0.1, 1, 10, 100, 200 mu g/L) to determine its effects. At TBBPA concentrations above 1 mu g/L, the number of head thrashes, as the most sensitive physiological indicator, decreased significantly. Using the Illumina HiSeq (TM) 2000 sequencer, differentially expressed genes (DEGs) were determined, and 52 were down regulated and 105 were up regulated in the 200 mu g/L TBBPA treatment group versus the control group. Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway database analysis demonstrated that dorso-ventral axis formation is related to neurotoxicity;metabolism of xenobiotics by Cytochrome P450 (CYP450) and glutathione-S-transferase (GST) was found to be the vital metabolic mechanisms and were confirmed by quantitative real-time polymerase chain reaction (qRT-PCR). GST was ascribed to the augmentation because mutations in cyp-13A7 were constrained under TBBPA exposure. Additionally, oxidative stress indicators accumulated in a dose-dependent relationship. These results will help understand the molecular basis for TBBPA-induced toxicity in C. elegans and open novel avenues for facilitating the exploration of more efficient strategies against TBBPA toxicity. (C) 2019 Elsevier Ltd. All rights reserved.

关键词： Caenorhabditis elegans TBBPA Neurotoxicity Transcriptome Cyp-13A7

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Numerical Analysis of Fluid Force on Orifice Structure of Valve Disc For Nuclear Globe Valve

SSRN

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SSRN 2023年

作者： zhang, Ao Li, Qingye Zong, Chaoyong Liu, fuwen Xue, Tianhang Xiao, Jian Song, Xueguan School of Mechanical Engineering Dalian University of Technology Dalian116023 China School of Mechanical and Electrical Engineering Harbin Engineering University Harbin150000 China Dalian Dagao Valve Co. Ltd. Dalian116037 China

The globe valve fails to open completely sometimes due to insufficient lifting of the valve disc during the operation of the nuclear power plant. The main reason is the inadequate understanding of changes in fluid force. Therefore, conducting research on the fluid force of the globe valve is crucial. In this study, we establish a high-fidelity computational fluid dynamics (CFD) numerical model to investigate the flow characteristics of a novel graded globe valve. Based on the analysis results, we concluded that the size of the throttle orifice is an essential factor affecting fluid force. Therefore, the impact of the throttle orifice sizes on the fluid force is studied. Meanwhile, the influence of different valve disc displacements and inlet pressures on fluid force is quantitatively analyzed. This study provides a basis for the design of globe valves and has potential value for the dynamic control and energy utilization. © 2023, The Authors. All rights reserved.

关键词： Computational fluid dynamics

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Switched system approach to distributed guaranteed cost control for interconnected systems with communication unreliability

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IET CONTROL THEORY AND APPLICATIONS 2019年第12期13卷 1863-1871页

作者： zhang, Junhao zhang, Wen-An Yang, fuwen Zhejiang Univ Technol Dept Automat Hangzhou 310023 Zhejiang Peoples R China Zhejiang Prov United Key Lab Embedded Syst Hangzhou 310023 Zhejiang Peoples R China Griffith Univ Griffith Sch Engn Gold Coast Qld 4222 Australia

This study presents a switched system approach to distributed guaranteed cost control for a class of interconnected systems, where the subsystems of the interconnected system are coupled via states. In the proposed scheme, the subsystems communicate with each other through a network with communication losses caused by the communication constraint or network attacks. The communication-based interconnected system is modelled as a switched system with parameters uncertainties in system matrixes induced by sampling jitter and network time-varying delays. The stability analysis and guaranteed cost controller design are presented by applying the average dwell time method. Meanwhile, a quantitative relation between the system performance and the communication quality is established. Finally, numerical simulations are given to show the effectiveness of the proposed results.

关键词： linear matrix inequalities interconnected systems Lyapunov methods uncertain systems time-varying systems delays control system synthesis stability switched system approach cost control communication unreliability subsystems communication losses communication constraint communication-based interconnected system system matrixes guaranteed cost controller design system performance communication quality

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A Short-term Traffic Forecasting Model Based on Wavelet Neural Network with Novel Teaching Learning Based Optimization 39

A Short-term Traffic Forecasting Model Based on Wavelet Neur...

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39th Chinese Control Conference (CCC)

作者： zhang, Qingyong Ye, Ziliu Ding, Yuechen Su, fuwen Wuhan Univ Technol Sch Automat Wuhan 430070 Peoples R China Wuhan Univ Technol Sch Comp Sci & Technol Wuhan 430070 Peoples R China

ISBN: (纸本)9789881563903

Short-term traffic flow prediction is of vital significance to traffic monitoring and induction. It is a nonlinear problem with considerable uncertainty. In this paper, a novel teaching-learning based optimization (NTLBO) algorithm is proposed for wavelet neural network, whose parameters are optimized by NTLBO. Parameters of the network are divided into four parts to initialize the population of the novel algorithm. The four parts of parameters are optimized separately in teaching process. A self-learning process for teacher is attached as well to combine local search strategy and global search method in network training, which enhance the search ability of the algorithm. Finally, the model will be verified by time-series data, compared with other neural network methods. The final experimental results indicates that the new algorithm performs better in forecasting and nonlinear curve fitting.

关键词： Short-term traffic volume forecasting wavelet neural network teaching learning based optimization (NTLBO) local search strategy

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先驱体转化法制备氮化硼陶瓷纤维研究进展

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硅酸盐学报 2024年第9期52卷 2875-2888页

作者：杜贻昂张韵铂宋曲之王福稳谭士湘王兵王应德国防科技大学空天科学学院新型陶瓷纤维及其复合材料重点实验室长沙410073

氮化硼纤维具有低密度、高强度、耐高温、强绝缘和高透波等特性,是空天飞行器所需高性能透波复合材料的增强纤维。先驱体转化法是氮化硼纤维最具潜力的制备方法之一。目前,高性能氮化硼纤维的制备是该领域的主要挑战,其组成结构调控与... 详细信息

氮化硼纤维具有低密度、高强度、耐高温、强绝缘和高透波等特性,是空天飞行器所需高性能透波复合材料的增强纤维。先驱体转化法是氮化硼纤维最具潜力的制备方法之一。目前,高性能氮化硼纤维的制备是该领域的主要挑战,其组成结构调控与构效关系引起了广泛关注。当前研究的重点集中在氮化硼纤维工艺优化上,包括先驱体分子组成结构优化、热处理工艺和纤维微结构调控。本文结合国内外研究现状,在介绍先驱体转化法的基础上,从分子结构及其构效关系的角度切入,分别从氮化硼先驱体的合成和调控方法以及纤维热处理与纤维微结构调控等方面综述了最新的研究进展,并展望了氮化硼纤维的未来发展方向。

关键词：氮化硼陶瓷纤维先驱体转化法分子结构调控热处理

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