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Dynamics of luffing motion of a hydraulically driven shell manipulator with revolute clearance joints

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Defence Technology（防务技术） 2022年第4期18卷 689-708页

作者： Chen Zhi-qun Qian Lin-fang Chen Guang-song Nie shou-cheng Yin Qiang Yue Cai-cheng School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing210094China Northwest Institute of Mechanical and Electrical Engineering Xianyang712099ShaanxiChina China North Industry Corporation Beijing100053China

In this study,a modeling method for investigating the dynamic characteristics of a hydraulically driven shell manipulator with revolute clearance joints is *** model accounts for the effect of the clearance,the flexibility of the rotating beam,and the coupled dynamic characteristics of the hydraulic cylinder.A modified contact force model was developed to simulate the physical properties of realistic revolute joints with small clearances,heavy loads,and variable contact stiffnesses and damping coefficients with variations of the *** the strong coupling relationship between the hydraulic cylinder and the flexible beam,a system equation of motion combining the state variables of the hydraulic cylinder and mechanical system was *** complex nonlinear friction force of the hydraulic cylinder motion was constructed using a modified Lu Gre model,and the parameters of the friction model were identified using intelligent identification ***,a test system for the shell manipulator was established to achieve experimental ***,the effects of the clearance size and the stiffness of the cylinder support on the dynamic response were investigated.

关键词： Parameter identification Shell manipulator Hydraulic cylinder Revolute clearance joint

Simulation and detection of the topological properties of a modulated Rice-Mele model in a one-dimensional circuit-QED lattice

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Science China(Physics,Mechanics & Astronomy) 2018年第8期61卷 17-26页

作者： Lu Qi Yan Xing Ji Cao Xin-Xin Jiang cheng-shou an Ai-Dong Zhu shou Zhang Hong-Fu Wang Department of Physics College of Science Yanbian University Department of Electronic Information Engineering College of Engineering Yanbian University

Here, we propose a simple scheme to realize a one-dimensional （1D） modulated Rice-Mele model （RMM） and investigate its topological properties with a 1D circuit quantum electrodynamics （QED） lattice. The system can be mapped into a Chern insulator model by introducing a period parameter. Interestingly and surprisingly, we found that the circuit-QED lattice system always exhibits topologically nonttrvial phases if both the nearest-neighbor hopping strength between two resonators and the qubitassisted on-site potentials are alternately changed in the direction of the lattice. The numerical results show that the topological phases can be obtained by introducing an additional modulation parameter and both the edge state and topological invariant can be unambiguously seen with the existence of decay and disorders, even with few resonators in the lattice.

关键词： topological phase topological invariant Rice-Mele model circuit QED

Low-temperature conformal vacuum deposition of OLED devices using close-space sublimation

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Journal of Semiconductors 2023年第9期44卷 62-67页

作者： Bryan Siu Ting Tam shou-cheng Dong Ching W.Tang State Key Laboratory of Advanced Displays and Optoelectronics Technologies Department of Electronic and Computer EngineeringThe Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina Institute for Advanced Study The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina

Close-space sublimation(CSS)has been demonstrated as an alternative vacuum deposition technique for fabricating organic light-emitting diodes(OLEDs).CSS utilizes a planar donor plate pre-coated with organic thin films as an area source to rapidly transfer the donor film to a device substrate at temperatures below 200℃.CSS is also conformal and capable of depositing on odd-shaped substrates using flexible donor *** evaporation behaviors of organic donor films under CSS were fully characterized using model OLED materials and CSS-deposited films exhibited comparable device performances in an OLED stack to films deposited by conventional point *** low temperature and conformal nature of CSS,along with its high material utilization and short process time,make it a promising method for fabricating flexible OLED displays.

关键词： close-space sublimation OLED thin film low temperature vacuum deposition

Barrier Lyapunov functions-based dynamic surface control with tracking error constraints for ammunition manipulator electro-hydraulic system

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Defence Technology（防务技术） 2021年第3期17卷 836-845页

作者： shou-cheng Nie Lin-Fang Qian Long-Miao Chen Ling-Fei Tian Quan Zou School of Mechanical Engineering Nanjing University of Science and TechnologyNanjingChina

This paper focuses on the dynamic tracking control of ammunition manipulator system. A standard state space model for the ammunition manipulator electro-hydraulic system(AMEHS) with inherent nonlinearities and uncertainties considered was established. To simultaneously suppress the violation of tracking error constraints and the complexity of differential explosion, a barrier Lyapunov functionsbased dynamic surface control(BLF-DSC) method was proposed for the position tracking control of the ammunition manipulator. Theoretical analysis prove the stability of the closed-loop overall system and the tracking error converges to a prescribed neighborhood asymptotically. The effectiveness and dynamic tracking performance of the proposed control strategy is validated via simulation and experimental results.

关键词： Ammunition manipulator Electro-hydraulic system Error constraints Tracking control

Sphericity and Identity Test for High-dimensional Covariance Matrix Using Random Matrix Theory

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Acta Mathematicae Applicatae Sinica 2021年第2期37卷 214-231页

作者： shou-cheng YUAN Jie ZHOU Jian-xin PAN Jie-qiong SHEN College of Mathematics Sichuan UniversityChengdu 610064China School of Mathematics University of ManchesterManchester M139PLUK School of Computer and Data Engineering Zhejiang University Ningbo Institute of TechnologyNingbo 315100China

This paper addresses the issue of testing sphericity and identity of high-dimensional population covariance matrix when the data dimension exceeds the sample *** central limit theorem of the first four moments of eigenvalues of sample covariance matrix is derived using random matrix theory for generally distributed ***,some desirable asymptotic properties of the proposed test statistics are provided under the null hypothesis as data dimension and sample size both tend to *** show that the proposed tests have a greater power than existing methods for the spiked covariance model.

关键词： sphericity test identity test high-dimensional covariance matrix spiked model spectral distribution

New Thymol Derivate from Centipeda minima

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Chemical Research in Chinese Universities 2009年第1期25卷 125-126页

作者： PU shou-cheng GUO Yuan-qiang GAO Wen-yuan ZHANG Tie-jun School of Pharmaceutical Science and Technology Tianjin University Tianjin 300072 P. R. China Department of Pharmaceutical Sciences Nankai University Tianjin 300071 P. R. China Tianjin Institute of Pharmaceutical Research Tianjin 300193 P. R. China

1 Introduction Centipeda minima（Compositae） is an annual herbaceous plant found in moist places throughout the plains mainly in the southern regions of the People＇s Republic of China, Eastern tropical Asia, Australia and the Pacific Islands. It is a commonly used Chinese folk medicine for colds, whooping cough, nasal allergy, malaria and asthma. A number of sesquiterpene lactones, flavonoids and triterpenes have previously been isolated from C. minima. During our study on searching for biological active components from this plant,

关键词： Centipeda minima Thymol derivate Thymohydroquinone 6-O-β-6'-acetyl-Glc

Analysis of acupoint massage combined with touch on relieving anxiety and pain in patients with oral implant surgery

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World Journal of Psychiatry 2024年第4期14卷 533-540页

作者： Jin-Hong Qu cheng-cheng shou Xin He Qin Wang Yue-Xia Fang Department of Stomatology Hangzhou Lin'an Traditional Chinese Medicine HospitalHangzhou 311300Zhejiang ProvinceChina Department of Software R&D Hangzhou Broadlink Technology CoLtd.Hangzhou 311300Zhejiang ProvinceChina Department of Stomatology Hangzhou Red Cross HospitalHangzhou 310003Zhejiang ProvinceChina Department of Cardiovascular Hangzhou Lin'an Traditional Chinese Medicine HospitalHangzhou 311300Zhejiang ProvinceChina Department of Traditional Chinese Medicine Development Hangzhou Lin'an Traditional Chinese Medicine HospitalHangzhou 311300Zhejiang ProvinceChina

BACKGROUND Oral implant surgery is an effective procedure for artificial implants in missing tooth areas under local *** patients under local anesthesia are conscious during this procedure,compared with general anesthesia-related operations,they are more likely to experience negative emotions,such as anxiety and *** emotional reactions result in shivering and chills in the limbs,leading to poor doctor-patient cooperation and even avoidance of *** traditional Chinese medicine,it is believed that acupoint massage regulates blood and Qi,dredge menstruation,and relieve pain,which is beneficial for patients’emotional adjustment;however,there are few related clinical *** To observe the changes in anxiety and pain in patients with oral implant after acupoint massage combined with touch *** One hundred patients undergoing oral implantation in our hospital between May 2020 and May 2023 were randomly divided into control and study groups,according to a random number table,with 50 patients in each *** control group received routine intervention,and the study group received acupoint massage combined with touch on the basis of the control ***[assessed using the Modified Dental Anxiety Scale(MDAS)],pain severity,blood pressure,heart rate,and satisfaction were compared between the two *** Before intervention,the difference in MDAS score between the two groups was not significant(P>0.05),while after the intervention,the MDAS scores decreased in both groups compared with those before the intervention(P0.05).The systolic and d

关键词： Oral implant Acupoint massage Touch Anxiety Degree of pain

Screening and identifkation of proteins interacting with nudeostemin

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World Journal of Gastroenterology 2005年第31期11卷 4812-4814页

作者： Hai-Xia Yang Geng-Lin Jin Ling Meng Jian-Zhi Zhang Wen-Bin Liu cheng-Chao shou Department of Biochemistry and Molecular Biology Peking University School of Oncology and Beijing Institute for Cancer Research Beijing 100034 China

AIM： To identify the proteins interacting with nucleostemin （NS）, thereby gaining an insight into the function of NS. METHODS： Yeast two-hybrid assay was performed to screen a human placenta cDNA library with the full length of NS as a bait. X-Gal assay and β-galactosidase filter assay were subsequently conducted to check the positive clones and the gene was identified by DNA sequencing. To further confirm the interaction of two proteins, the DNA fragment coding NS and the DNA fragment isolated from the positive clone were inserted into the mammalian expression vector pcDNA3 and pcDNA3-myc, respectively. Then, two plasmids were cotransfected into the COS-7 cells by DEAE-dextron. The total protein from the cotransfected cells was extracted and coimmunoprecipitation and Western blot were performed with suitable antibodies sequentially. RESULTS： Two positive clones that interacted with NS were obtained from human placenta cDNA library. One was an alpha isoform of human protein phosphatase 2 regulatory subunit B （B56）（PPP2RSA） and the other was a novel gene being highly homologous to the gene associated with spondylo paralysis. The co-immunoprecipitation also showed that NS specifically interacted with PPP2R5A. CONCLUSION： NS and PPP2R5A interact in yeast and mammalian cells, respectively, which is helpful for addressing the function of NS in cancer development and progression.

关键词： Nucleostemin Yeast two-hybrid Co-IP

A plasmonic waveguide end-coupled to two plasmonic cavities in a non-Hermitian quantum system for dual-band unidirectional reflectionlessness

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Communications in Theoretical Physics 2021年第3期73卷 73-77页

作者： Hang Yang Fei Zhao Ling-Xue Yu De-Xiu Qiu cheng-shou an Ying-Qiao Zhang Xing-Ri Jin Department of Physics College of ScienceYanbian UniversityYanji133002China Center for Quantum Sciences and School of Physics Northeast Normal UniversityChangchun 130024China

We demonstrate the possibility of dual-band unidirectional reflectionlessness in a non-Hermitian quantum system composed of a plasmonic waveguide and two end-coupled plasmonic cavities(PCs).Our scheme exhibits dual-band unidirectional reflectionlessness can be obtained at exceptional points by properly adjusting the coupling strength between two PCs,the ratio of decay rates of two PCs,and the ratio of plasmonic cavity-waveguide coupling *** a valuable feature,the quality factor reaches to~175.4 in forward direction,while the backward quality factor is close to~188.2.

关键词： unidirectional reflectionlessness exceptional point plasmonic waveguide