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High AOA decoupling control for aircraft based on ADRC

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Journal of Systems Engineering and Electronics 2020年第2期31卷 393-402页

作者： liu Junjie SUN Mingwei CHEN Zengqiang SUN Qinglin College of Artificial Intelligence Nankai UniversityTianjin 300350China

In this paper, a practical decoupling control scheme for fighter aircraft is proposed to achieve high angle of attack(AOA)tracking and super maneuver action by utilizing the thrust vector technology. Firstly, a six degree-of-freedom(DOF) nonlinear model with 12 variables is given. Due to low sufficiency of the aerodynamic actuators at high AOA, a thrust vector model with rotatable engine nozzles is derived. Secondly, the active disturbance rejection control(ADRC) is used to realize a three-channel decoupling control such that a strong coupling between different channels can be treated as total disturbance, which is estimated by the designed extended state observer. The control surface allocation is implemented by the traditional daisy chain method. Finally,the effectiveness of the presented control strategy is demonstrated by some numerical simulation results.

关键词： high angle of attack(AOA) decoupling control linear extended state observer(LESO) active disturbance rejection control(ADRC) thrust vector technology control allocation

Robust zero-watermarking algorithm based on discrete wavelet transform and daisy descriptors for encrypted medical image

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CAAI Transactions on Intelligence Technology 2024年第1期9卷 40-53页

作者： Yiyi Yuan Jingbing Li Jing liu Uzair Aslam Bhatti Zilong liu Yen-wei Chen School of Information and Communication Engineering Hainan UniversityHaikouChina Research Center for Healthcare Data Science Zhejiang LabHangzhouChina Graduate School of Information Science and Engineering Ritsumeikan University ShigaJapan

In the intricate network environment,the secure transmission of medical images faces challenges such as information leakage and malicious tampering,significantly impacting the accuracy of disease diagnoses by medical *** address this problem,the authors propose a robust feature watermarking algorithm for encrypted medical images based on multi-stage discrete wavelet transform(DWT),daisy descriptor,and discrete cosine transform(DCT).The algorithm initially encrypts the original medical image through DWT-DCT and Logistic ***,a 3-stage DWT transformation is applied to the encrypted medical image,with the centre point of the LL3 sub-band within its low-frequency component serving as the sampling *** daisy descriptor matrix for this point is then ***,a DCT transformation is performed on the daisy descriptor matrix,and the low-frequency portion is processed using the perceptual hashing algorithm to generate a 32-bit binary feature vector for the medical *** scheme utilises cryptographic knowledge and zero-watermarking technique to embed watermarks without modifying medical images and can extract the watermark from test images without the original image,which meets the basic re-quirements of medical image *** embedding and extraction of water-marks are accomplished in a mere 0.160 and 0.411s,respectively,with minimal computational *** results demonstrate the robustness of the algorithm against both conventional attacks and geometric attacks,with a notable performance in resisting rotation attacks.

关键词： daisy descriptor DCT DWT encryption domain medical image zero-watermarking

Mechanically robust and dynamic supramolecular polymer networks enabled by[an]daisy chain backbones

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Science China Chemistry 2024年第12期67卷 4234-4241页

作者： Yongming Wang Yi Ding Yuhang liu Shaolei Qu Wenbin Wang Wei Yu Zhaoming Zhang Feng liu Xuzhou Yan School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative MoleculesShanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory for Mechanical Behavior of Materials Shaanxi International Research Center for Soft MatterSchool of Materials Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China

Supramolecular polymer networks(SPNs)have garnered significant research interest due to their dynamic ***,while current developments primarily focus on managing supramolecular crosslinks,the role of polymer backbones—equally crucial to SPN properties—has not yet been sufficiently ***,we utilize mechanically interlocked[an]daisy chain as backbone to prepare a class of SPNs,where the force-induced motion of successive mechanical bonds toughens and reinforces the *** specific,the[an]daisy chain backbones connect with polynorbornene chains through quadruple H-bonding in the SPN *** to the control with non-slidable backbone,The representative SPN-2 exhibits a robust feature in tensile tests with high maximum stress(14.7 vs.7.89 MPa)and toughness(83.8 vs.48.6 MJ/m^(3)).Moreover,it also has superior performance in energy dissipation benefitting from the[an]daisy chain backbones as well as supramolecular ***,the SPN-2 displayed exceptional self-healing and reprocessing capabilities due to their dynamic quadrable H-bonding *** findings demonstrate the untapped potential of[an]daisy chain as a polymer skeleton to develop SPNs and open the door to design mechanically robust supramolecular materials with diverse smart functions.

关键词： supramolecular polymer networks mechanical bond [an]daisy chains self-healing dynamic materials

Study on stable and meta-stable carbides in a high speed steel for rollers during tempering processes

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International Journal of Minerals,Metallurgy and Materials 2013年第2期20卷 146-151页

作者： Jing Guo Hong-wei Qu Li-gang liu Yan-liang Sun Yue Zhang Qing-xiang Yang State Key Laboratory of Meta-stable Materials Science and Technology Yanshan University School of Material Science and Engineering University of Science and Technology Beijing

A high speed steel （HSS） was studied for rollers in this work. The steel was quenched at 1150℃ and tempered at 520℃. The phase structures of the steel were determined by X-ray diffraction （XRD）, and the hardness of specimens was measured. The volume fraction of carbides was counted by Image-Pro Plus software. The typical microstructures were observed by field emission scanning electron microscope （FESEM）. Stable and meta-stable carbides were deduced by removing the existing phases one by one in the Fe-C equilibrium calculation. It is found that the precipitated carbides are bulk-like MC, long stripe-like M2C, fishbone-like M6C, and daisy-like M7C3 during the tempering process. The stable carbides are MC and M6C, but the meta-stable ones are M2C, M7C3, and M3C.

关键词： high speed steel phase diagrams tempering carbides

雏菊叶龙胆酮拮抗阿霉素诱导心肌损伤中差异表达lncRNA的筛选及分析

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中国组织工程研究 2024年第26期28卷 4121-4128页

作者：刘莹刘亚磊刘玉河北中医学院生物化学与生物学教研室河北省心脑血管病中医药防治研究重点实验室河北省石家庄市050000 河北中医学院实验中心河北省石家庄市050000

背景:有研究表明,长链非编码RNA(long non-coding RNA,lncRNA)在心脏疾病的发生和发展中发挥了重要作用,其是否参与雏菊叶龙胆酮拮抗阿霉素诱导的小鼠心脏损伤目前未见报道。目的:筛选雏菊叶龙胆酮改善阿霉素诱导心肌损伤小鼠心肌组织... 详细信息

背景:有研究表明,长链非编码RNA(long non-coding RNA,lncRNA)在心脏疾病的发生和发展中发挥了重要作用,其是否参与雏菊叶龙胆酮拮抗阿霉素诱导的小鼠心脏损伤目前未见报道。目的:筛选雏菊叶龙胆酮改善阿霉素诱导心肌损伤小鼠心肌组织中差异表达的lncRNA,并对其进行生物信息学分析。方法:取48只C57小鼠,采用随机数字表法分为正常组、模型组、雏菊叶龙胆酮组和阳性药组,每组12只。模型组、雏菊叶龙胆酮组和阳性药组小鼠腹腔注射阿霉素,隔日一次,共8次;雏菊叶龙胆酮组和阳性药组在注射阿霉素的基础上分别灌胃给予雏菊叶龙胆酮悬浊液、卡托普利溶液,1次/d,连续给药21 d。给药结束后,进行心电图检查与心肌组织病理形态观察,同时对小鼠心肌组织进行高通量测序分析,筛选出差异表达的lncRNA,对差异表达的lncRNA进行靶基因预测,并对靶基因进行GO富集与KEGG信号通路分析。结果与结论:①模型组小鼠心电图ST段明显抬高,雏菊叶龙胆酮组小鼠心电图ST段抬高程度减轻;苏木精-伊红、Masson及天狼猩红染色显示,模型组小鼠心肌组织中心肌胞浆着色不均,颜色深浅不一,心肌纤维完整性及连续性较差,可见大量胶原纤维沉积;雏菊叶龙胆酮处理后小鼠心肌组织异常情况有所改善。②高通量测序分析结果显示,与模型组相比,雏菊叶龙胆酮组小鼠心肌组织识别出差异表达lncRNA共270个,其中表达上调的lncRNA有165个,表达下调的lncRNA有105个。结合实验结果与相关文献,最终获得3条LncRNA(NONMMUT149833.1、NONMMUT003237.2、ENSMUST00000219015)及4个相关mRNAs(Alas2、Igf2、Acta1、Cilp)。靶基因预测、GO富集与KEGG信号通路分析结果显示,雏菊叶龙胆酮处理后,心肌损伤小鼠心肌组织中差异表达的lncRNA可通过顺式(cis-)和/或反式(trans-)调控来调节其靶蛋白编码基因的表达,参与调控分子功能及生物过程等。③结果显示,雏菊叶龙胆酮可显著改善阿霉素诱导心肌损伤小鼠的心功能和部分lncRNA表达。

关键词：雏菊叶龙胆酮心肌损伤长链非编码RNA 生物信息学信号通路

Harpoon-shaped topological photonic crystal for on-chip beam splitter

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Science China(Physics,Mechanics & Astronomy) 2024年第9期67卷 91-98页

作者： Zhiwei Guan Ruixue Dou Chuangxin Xie Tianyimei Zuo Liyu Huang Keyin Wen Chaofeng Wang Huapeng Ye Junmin liu Ze Dong Dianyuan Fan Shuqing Chen Institute of Microscale Optoelectronics Shenzhen UniversityShenzhen 518060China College of Physics and Engineering Technology Minzu Normal University of XingyiXingyi 562400China Guangdong Provincial Key Laboratory of Optical Information Materials and Technology and Institute of Electronic Paper Displays South China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou 510006China College of New Materials and New Energies Shenzhen Technology UniversityShenzhen 518118China School of information and Electronics Beijing Institute of TechnologyBeijing 100081China

The advancement of integrated optical communication networks necessitates the deployment of on-chip beam splitters for efficient signal interconnections at network ***,the pursuit of micron-scale beam splitting with large corners and reducing the device footprint to boost connection flexibility often results in phase *** mismatches,which stem from radiation modes and backward scattering,pose significant obstacles in creating highly integrated and interference-resistant *** address this,we introduce a solution based on the topological valley-contrasting state generated by photonic crystals with opposing valley Chern numbers,manifested in a harpoon-shaped structure designed to steer the splitting *** approach enables adiabatic mode field evolution over large corners,capitalizing on the robust phase modulation capabilities and topological protection provided by the subwavelength-scale valley-contrasting *** demonstration reveals that beam splitters with large corners of 60°,90°,and 120°exhibit insertion loss fluctuations below 2.7 dB while maintaining a minimal footprint of 8.8μm×8.8μ*** a practical demonstration,these devices facilitate three-channel signal connections,successfully transmitting quadrature phase shift keying signals at 3.66 Tbit/s with bit error rates below the forward error correction threshold,demonstrating performance comparable to that in defects *** harnessing the unidirectional excitation feature,we anticipate significant enhancements in the capabilities of signal distribution and connection networks through a daisy chain configuration.

关键词： channel interconnection on-chip beam splitter topological valley-contrasting state

Exploring the Symbolic Meaning of the Name daisy Fay in the Great Gatsby

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校园英语 2015年第6期 236-237页

作者：刘欢公安海警学院

daisy Fay in the Great Gatsby,designed by the author intentionally,is such a wonderful name and full of symbolic *** features of the name are not only considered to reflect the essence and personality of daisy Fay,but... 详细信息

关键词： the Great Gatsby daisy Fay the symbolic meaning

A Contradiction of Collective Unconscious and Personal Unconscious in daisy in The Great Gatsby

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海外英语 2019年第18期 212-213页

作者：刘淳四川工商学院

The Great Gatsby written by Fitzgerald is an influential classic in American literature,and its author Fitzgerald is consid ered as a chronicler of the“Jazz Age”.There are three main women characters in the novel and they all play important roles in re vealing the ***,these women are all the victims of the society in American *** paper tries to analyze the contradictory characters in daisy based on Jung Carl Gustav’s collective unconscious and personal unconscious.

关键词： The Great Gatsby collective unconscious personal unconscious contradictory

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嵌入式电子贾卡控制系统设计

纺织学报 2016年第10期37卷 135-140页

作者：赖森财任雯刘永桂三明学院机电工程学院福建三明365004 华南理工大学自动化科学与工程学院广东广州510641

针对结构复杂、多板卡级联形式的传统经编机电子贾卡控制系统存在可靠性低、占用物理空间大、安装与检修困难等问题,设计了一种将微控制器、花型数据存储器、贾卡驱动电路、升压电路以及通信接口功能模块高度集成在贾卡导纱针块内部的... 详细信息

针对结构复杂、多板卡级联形式的传统经编机电子贾卡控制系统存在可靠性低、占用物理空间大、安装与检修困难等问题,设计了一种将微控制器、花型数据存储器、贾卡驱动电路、升压电路以及通信接口功能模块高度集成在贾卡导纱针块内部的嵌入式电子贾卡控制系统,电子贾卡导纱针块采用了全双工、低功耗的MAX488实现串行菊花链式通信模式。在系统分析压电陶瓷贾卡提花工作原理和特点的基础上,给出了嵌入式电子贾卡控制系统的系统架构、硬件电路的设计和实现方法。测试结果表明,该系统无需额外接入高压电源就能够独立工作,性能稳定,可靠性高,功能完备,抗干扰能力强。

关键词：经编机压电陶瓷贾卡提花电子贾卡嵌入式控制系统