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Modeling on mechanical behavior and damage evolution of single-lap bolted composite interference-fit joints under thermal effects

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Chinese Journal of Aeronautics 2021年第8期34卷 230-244页

作者： Junshan HU Kaifu ZHANG Hui CHENG peng zou College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China School of Mechanical Engineering Northwestern Polytechnical UniversityXi'an 710072China Aircraft Strength Research Institute of China Xi'an 710065China

This paper reports the modeling method and outcomes of mechanical performance and damage evolution of single-lap bolted composite interference-fit joints under extreme *** anisotropic continuum damage model involving thermal effects is established on continuum damage mechanics which integrates the shear nonlinearity constitutive relations characterized by Romberg-Osgood *** temperature-induced modification of thermal strains and material properties is incorporated in stress-strain analysis,extended 3 D failure criteria and exponential damage evolution *** proposed model is calibrated and employed to simulate behavior of composite joints in interference fitting,bolt preloading,thermal and bearing loading processes,during which the influence of interference-fit sizes,preload levels,laminate layups and service temperatures is thoroughly *** predicated interfacial behavior,bearing response and failure modes are in good agreement with experimental *** numerical model is even capable of reflecting some non-intuitive experimental findings such as residual stress relaxation and matrix softening at elevated temperatures.

关键词： Composite joints Damage evolution Interference fit Mechanical behavior Thermal effects

Probing two Higgs oscillations in a one-dimensional Fermi superfluid with Raman-type spin-orbit coupling

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Frontiers of physics 2022年第5期17卷 105-112页

作者： Genwang Fan Xiao-Long Chen peng zou College of Physics Qingdao UniversityQingdao 266071China Department of Physics Zhejiang Sci-Tech UniversityHangzhou 310018China Institute for Advanced Study Tsinghua UniversityBeijing 100084China

We theoretically investigate the Higgs oscillation in a one-dimensional Raman-type spin–orbit-coupled Fermi superfluid with the time-dependent Bogoliubov–de Gennes *** linearly ramping or abruptly changing the effective Zeeman field in both the Bardeen–Cooper–Schrieffer state and the topological superfluid state,we find the amplitude of the order parameter exhibits an oscillating behaviour over time with two different frequencies(i.e.,two Higgs oscillations)in contrast to the single one in a conventional Fermi *** observed period of oscillations has a great agreement with the one calculated using the previous prediction[Volkov and Kogan,***.38,1018(1974)],where the oscillating periods are now determined by the minimums of two quasi-particle spectrum in this *** further verify the existence of two Higgs oscillations using a periodic ramp strategy with theoretically calculated driving *** predictions would be useful for further theoretical and experimental studies of these Higgs oscillations in spin–orbit-coupled systems.

关键词： Higgs mode spin-orbit coupled Fermi superfluid

Dietary pattern and hepatic lipid metabolism

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Liver Research 2023年第4期7卷 275-284页

作者： peng zou Lin Wang Department of Hepatobiliary Surgery Xi-Jing HospitalThe Fourth Military Medical UniversityXi’anShaanxiChina

The liver is the leading site for lipid metabolism,involving not only fatty acid beta-oxidation but also de novo synthesis of endogenous triglycerides and *** liver maintains systemic lipid homeostasis by regulating lipid synthesis,catabolism,and *** of hepatic lipid metabolism precipitates disorders,such as non-alcoholic fatty liver disease(NAFLD),affecting the whole ***,comprehending and studying hepatic lipid metabolism is crucial for preventing and treating metabolic liver ***,researchers have investigated the impact of a single nutrient on hepatic lipid ***,real-life dietary patterns encompass diverse nutrients rather than single *** recent years,there have been increased studies and notable progress regarding the effects of distinct dietary patterns on hepatic lipid *** review summarizes the influence of diverse dietary patterns on hepatic lipid metabolism,elucidating underlying molecular mechanisms and appraising the therapeutic potential of dietary patterns in managing hepatic steatosis.

关键词： Non-alcoholic fatty liver disease(NAFLD) Hepatic lipid metabolism Dietary pattern Mediterranean diet Ketogenic diet

Supervised topic models with weighted words:multi-label document classification

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Frontiers of Information Technology & Electronic Engineering 2018年第4期19卷 513-523页

作者： Yue-peng zou Ji-hong OUYANG Xi-ming LI College of Computer Science and Technology Jilin University MOE Key Laboratory of Symbolic Computation and Knowledge Engineering Jilin University

Supervised topic modeling algorithms have been successfully applied to multi-label document classification *** models include labeled latent Dirichlet allocation(L-LDA)and ***,these models neglect the class frequency information of words(i.e.,the number of classes where a word has occurred in the training data),which is significant for *** address this,we propose a method,namely the class frequency weight(CF-weight),to weight words by considering the class frequency *** CF-weight is based on the intuition that a word with higher(lower)class frequency will be less(more)*** this study,the CF-weight is used to improve L-LDA and dependency-LDA.A number of experiments have been conducted on real-world multi-label *** results demonstrate that CF-weight based algorithms are competitive with the existing supervised topic models.

关键词： Supervised topic model Multi-label classification Class frequency Labeled latent Dirichlet allocation (L-LDA) Dependency-LDA

Square Geometrical Shaping 128QAM Based Time Domain Hybrid Modulation in Visible Light Communication System

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China Communications 2020年第1期17卷 163-173页

作者： peng zou Yiheng Zhao Fangchen Hu Nan Chi Key Laboratory for Information Science of Electromagnetic Waves Fudan University

We proposed two kinds of visible light communication(VLC)systems which respectively based on 64QAM/square geometrical shaping(SGS)128QAM time domain hybrid modulation scheme(SGSHY)and 64QAM/128QAM time domain hybrid modulation scheme(REGHY).These two systems can operate around specific forward error correction(FEC)threshold and maximize the achievable information rate(AIR)of the *** principles of SGSHY and REGHY are proposed in detail,which has very low computation complexity compared with probabilistic *** SGSHY outperforms REGHY at high peak to peak voltage(Vpp).Experimental results show that at high Vpp like 1.4V,which means the system is suffering from high nonlinear distortion,the AIR of SGSHY outperforms that of REGHY by 0.12Gb/s at the 2×10-2 FEC *** AIR of the REGHY is at most 0.36Gb/s higher than that of 64QAM at 0.8V Vpp and 7%FEC threshold,while the(achievable information rate)AIR of SGSHY is at most 0.40Gb/s higher than that of 64QAM at 1.4V Vpp and 20%FEC threshold.

关键词： SGS128QAM MPN TDHM nonlinear distortion achievable information rate

Damage propagation and strength prediction of a single-lap interference-fit laminate structure

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Frontiers of Mechanical Engineering 2020年第4期15卷 558-570页

作者： peng zou Xiangming CHEN Hao CHEN Guanhua XU Full Scale Aircraft Structural Static/Fatigue Laboratory AVIC Aircraft Strength Research Institute of ChinaXi’an 710065China School of Mechanical Engineering Northwestern Polytechnical UniversityXi’an 710072China

Experimental and finite element research was conducted on the bolted interference fit of a single-lap laminated structure to reveal the damage propagation mechanism and strength change law. A typical single-lap statically loading experiment was performed, and a finite element damage prediction model was built based on intralaminar progress damage theory. The model was programmed with a user subroutine and an interlaminar cohesive zone method. The deformation and damage propagation of the specimen were analyzed, and the failure mechanism of intralaminar and interlaminar damage during loading was discussed. The effect of secondary bending moment on load translation and damage distribution was revealed. The experimental and simulated load–displacement curves were compared to validate the developed model’s reliability, and the ultimate bearing strengths under different fit percentages were predicted. An optimal percentage was also recommended.

关键词： single-lap interference fit secondary bending moment damage mechanism bearing strength

Dendritic Morphology Affects the Velocity and Amplitude of Back-propagating Action Potentials

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Neuroscience Bulletin 2022年第11期38卷 1330-1346页

作者： Wu Tian Luxin peng Mengdi Zhao Louis Tao peng zou Yan Zhang State Key Laboratory of Membrane Biology College of Life SciencesPeking UniversityBeijing 100871China College of Chemistry and Molecular Engineering Synthetic and Functional Biomolecules CenterBeijing National Laboratory for Molecular SciencesKey Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of EducationPeking UniversityBeijing 100871China Center for Quantitative Biology Academy for Advanced Interdisciplinary StudiesPeking UniversityBeijing 100871China PKU-IDG/McGovern Institute for Brain Research Peking UniversityBeijing 100871China Center for Bioinformatics National Laboratory of Protein Engineering and Plant Genetic EngineeringSchool of Life SciencesPeking UniversityBeijing 100871China Peking-Tsinghua Center for Life Sciences Peking UniversityBeijing 100871China Chinese Institute for Brain Research(CIBR) Beijing 102206China Beijing Academy of Artifcial Intelligence Beijing 100084China

The back-propagating action potential(bpAP)is crucial for neuronal signal integration and synaptic plasticity in dendritic *** properties(velocity and amplitude)can be affected by dendritic *** to limited spatial resolution,it has been difficult to explore the specific propagation process of bpAPs along dendrites and examine the influence of dendritic morphology,such as the dendrite diameter and branching pattern,using patch-clamp *** taking advantage of Optopatch,an all-optical electrophysiological method,we made detailed recordings of the real-time propagation of bpAPs in dendritic *** found that the velocity of bpAPs was not uniform in a single dendrite,and the bpAP velocity differed among distinct dendrites of the same *** velocity of a bpAP was positively correlated with the diameter of the dendrite on which it *** addition,when bpAPs passed through a dendritic branch point,their velocity decreased *** to velocity,the amplitude of bpAPs was also positively correlated with dendritic diameter,and the attenuation patterns of bpAPs differed among different *** results from neuron models with different dendritic morphology corresponded well with the experimental *** findings indicate that the dendritic diameter and branching pattern significantly influence the properties of *** diversity among the bpAPs recorded in different neurons was mainly due to differences in dendritic *** results may inspire the construction of neuronal models to predict the propagation of bpAPs in dendrites with enormous variation in morphology,to further illuminate the role of bpAPs in neuronal communication.

关键词： Dendrite Action potential Backpropagation Synaptic integration

Decellularized small intestine submucosa/polylactic-co-glycolic acid composite scaffold for potential application in hypopharyngeal and cervical esophageal tissue repair

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Regenerative Biomaterials 2021年第2期8卷 43-49页

作者： Shijie Qiu Lijin Liang peng zou Qi Chen Department of Otorhinolaryngology-Head and Neck Surgery The First Affiliated Hospital of Zhejiang University79 Qingchun RoadHangzhou310003People’s Republic of China Department of Otorhinolaryngology-Head and Neck Surgery Lihuili Hospital of Ningbo University57 Xingning RoadNingbo315041People’s Republic of China Ningbo Regen Biotech Co. Ltd199 East Hexiao RoadNingbo315157People’s Republic of China

There has been an increase in the incidence of hypopharyngeal and cervical esophageal cancer worldwide,and hence growing needs for hypopharyngeal and cervical esophageal tissue *** work produced a bi-layer composite scaffold with decellularized small intestine submucosa and polylactic-co-glycolic acid,which resembled the layered architectures of its intended *** decellularized small intestine submucosa contained minimal residual DNA(52.5±61.2 ng/mg)and the composite scaffold exhibited satisfactory mechanical properties(a tensile modulus of 21.1±64.8 MPa,an ultimate tensile strength of 14.0±62.9MPa and a failure strain of 26.9±65.1%).The interactions between cells and the respective layers of the scaffold were characterized by CCK-8 assays,immunostaining and Western *** cell proliferation and phenotypic behaviors were *** results have provided an important basis for the next-step in vivo studies of the scaffold,and bode well for its future clinical applications.

关键词： small intestine submucosa polylactic-co-glycolic acid hypopharyngeal and cervical esophageal cancer tissue repair composite scaffold

Effects of Cr Content and Annealing Temperature on Microstructure and Wear Characteristics of Cast Ausferrite Nodular Iron

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Journal of Iron and Steel Research International 2015年第11期22卷 1049-1054页

作者： Jia-peng zou Kazumichi SHIMIZU Qi-zhou CAI State Key Laboratory of Materials Processing and Die & Mould Technology Huazhong University of Science and Technology Department of Materials Science and Engineering Muroran Institute Technology

The effects of Cr content and annealing temperature on abrasive wear characteristics of cast ausferrite nodular iron were investigated with Suga type abrasive wear tester. The surface morphology and Vickers hardness of the tested samples were analyzed by scanning electron microscopy（SEM）, digital microscope and Vickers hardness tester. The results show that the cast ausferrite nodular iron could be obtained by alloying with Cr in the as-cast ductile cast iron and permanent mold casting, and the bainite content in the matrix increased with increasing Cr content. However, the decomposition of bainite took place during annealing at 500 °C to 800 °C; especially, at 800 °C, the bainite transformed into a mixture of fine lamellar pearlite and ferrite matrix structure. The wear loss of specimens was reduced with increasing Cr content in the cast ausferrite nodular iron. The wear loss of the sample cast ausferrite nodular iron with 0.4mass% Cr is the least. The wear loss began to increase while the Cr content is 0.6mass%. The wear loss of annealed ductile irons at different annealing temperatures was higher than that of as-cast samples. During the abrasive wear, the shear stress transformed austenite to martensite, and the hardness of specimens increased and the wear resistance of as-cast ductile cast iron was improved.

关键词： cast ausferrite nodular iron Cr content annealing temperature microstructure wear characteristics