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Data-mining and atmospheric corrosion resistance evaluation of Sn-and Sb-additional low alloy steel based on big data technology

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International Journal of Minerals,Metallurgy and Materials 2022年第4期29卷 825-835页

作者： Xiaojia yang Jike yang ying yang Qing Li Di Xu Xuequn Cheng Xiaogang Li Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China Shunde Graduate School University of Science and Technology BeijingFoshan 528399China Beike Research Center for Advanced Corrosion Resistant Materials Guangzhou 511400China

Machine-learning and big data are among the latest approaches in corrosion *** biggest challenge in corrosion research is to accurately predict how materials will degrade in a given *** big data is the application of mathematical methods to huge amounts of data to find correlations and infer *** is possible to use corrosion big data method to distinguish the influence of the minimal changes of alloying elements and small differences in microstructure on corrosion resistance of low alloy *** this research,corrosion big data evaluation methods and machine learning were used to study the effect of Sb and Sn,as well as environmental factors on the corrosion behavior of low alloy *** depict corrosion big data method can accurately identify the influence of various factors on corrosion resistance of low alloy and is an effective and promising way in corrosion research.

关键词： machine-learning corrosion big data low alloy steels corrosion resistance

Analysis of the rogue waves in the blood based on the high-order NLS equations with variable coefficients

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Chinese Physics B 2021年第11期30卷 151-169页

作者： ying yang Yu-Xiao Gao Hong-Wei yang College of Mathematics and Systems Science Shandong University of Science and TechnologyQingdao 266590China Qingdao West Coast New Area Hospital of Traditional Chinese Medicine Qingdao 266590China

The research of rogue waves is an advanced field which has important practical and theoretical significances in mathematics,physics,biological fluid mechanics,oceanography,*** the reductive perturbation theory and long wave approximation,the equations governing the movement of blood vessel walls and the flow of blood are transformed into high-order nonlinear Schrodinger(NLS)equations with variable *** third-order nonlinear Schrodinger equation is degenerated into a completely integrable Sasa–Satsuma equation(SSE)whose solutions can be used to approximately simulate the real rogue waves in the *** the first time,we discuss the conditions for generating rogue waves in the blood vessels and effects of some physiological parameters on the rogue *** on the traveling wave solutions of the fourth-order nonlinear Schrodinger equation,we analyze the effects of the higher order terms and the initial deformations of the blood vessel on the wave propagation and the displacement of the tube *** results reveal that the amplitude of the rogue waves are proportional to the initial stretching ratio of the *** high-order nonlinear and dispersion terms lead to the distortion of the wave,while the initial deformation of the tube wall will influence the wave amplitude and wave steepness.

关键词： rogue wave variable-coefficients high-order nonlinear Schrodinger equation deformable blood vessels Sasa-Satsuma equation

The Hedgehog signalling pathway in bone formation

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International Journal of Oral Science 2015年第2期7卷 73-79页

作者： Jing yang Philipp Andre Ling Ye ying-Zi yang State Key Laboratory of Oral Diseases West China Hospital of StomatologySichuan University Genetic Disease Research National Human Genome Research InstituteNational Institutes of Health Harvard School of Dental Medicine

The Hedgehog（Hh） signalling pathway plays many important roles in development,homeostasis and *** critical function of Hh signalling in bone formation has been identified in the past two ***,we review the evolutionariiy conserved Hh signalling mechanisms with an emphasis on the functions of the Hh signalling pathway in bone development,homeostasis and *** the early stages of embryonic limb development,Sonic Hedgehog（Shh） acts as a major morphogen in patterning the limb *** Hedgehog（Ihh） has an essential function in endochondral ossification and induces osteoblast differentiation in the *** signalling is also involved intramembrane *** between Hh and Wnt signalling regulate cartilage development,endochondral bone formation and synovial joint *** also plays an important role in bone homeostasis,and reducing Hh signalling protects against age-related bone *** of Hh signalling regulation leads to multiple bone diseases,such as progressive osseous ***,understanding the signalling mechanisms and functions of Hh signalling in bone development,homeostasis and diseases will provide important insights into bone disease prevention,diagnoses and therapeutics.

关键词： ossification homeostasis cartilage embryonic conserved progressive regulate osteoclast osteoblast catenin

Polyethylene Oxide-Coated Electrospun Polyimide Fibrous Seperator for High-Performance Lithium-Ion Battery

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Journal of Materials Science & Technology 2016年第3期32卷 200-206页

作者： Xingxing Liang ying yang Xin Jin Jie Cheng Department of Electrical Engineering Tsinghua University Beijing 100084 China Beijing Smart China Energy Internet Research Institute Beijing 100176 China State Key Lab. of Power System Tsinghua University Beijing 100084 China Zhangjiagang Smartgrid Research Institute Zhangjiagang 215600 China Research Institute of Chemical Defense Beijing 100191 China

A polyethylene oxide （PEO）-coated polyimide （PI） membrane was prepared by electrospinning method followed by a dip-coating and drying process for high-performance lithium-ion batteries （LIB）. 8emicrystal PEO was covered on the surface of the fibers and partially enmeshed in PI matrix, which formed unique porous structures. The pores with an average size of 4.1 μm and a porosity of 90% served as ion transport channels. Compared with the cell with Celgard 2400 membrane, the half-cell using PEO-coated P1 membrane as a separator exhibits excellent electrochemical performance both at room temperature and at low temperature. The electrolyte uptaking rate of PEO-coated PI membrane was 170% and the ionic conductivity was 3.83 × 10^-3 S cm^-1. PEO-coated PI membrane possessed 5.3 V electrochemical window. The electrode-electrolyte interfacial resistance was 62.4 Ω. The capacity retention ratios with PEO- coated PI membrane were 86.4% at 5 C and 73.5% at 10 C at 25 ℃ and 75% at 5 C at 0 ℃. Furthermore, the cell using the separator demonstrates excellent capacity retention over cycling. These advanced characteristics would boost the application of the PEO-coated PI membrane for high-power lithium ion battery.

关键词： Lithium-ion batteries Electrospinning Polyimide Polyethylene oxide Low temperature

Screening Effect in Isotropic Gaussian Processes

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Acta Mathematica Sinica,English Series 2020年第5期36卷 512-534页

作者： Jing Yu BAO Fei YE ying yang Department of Mathematical Sciences Tsinghua UniversityBeijing 100062.P.R.China School of Statistics Capital University of Economics and BusinessBeijing 100026P.R.China

The screening effect is the phenomenon that optimal linear prediction of a spatial process on an unobserved location mostly depends on nearby *** is,the optimal predictor based on just nearby observations yields a good approximation of which based on the whole large ***,the approximation does not always perform well since the screening effect may not hold in all *** determine when the screening effect holds is an important issue in spatial *** paper provides some sufficient conditions for ensuring an asymptotic screening effect in Rd based on the spectral density of the underlying isotropic Gaussian process and the geometries of nearby *** results apply to isotropic processes with an arbitrary degree of *** we are predicting at origin,the conditions are(1)the spectral density is nearly a constant in balls of finite radius far from the origin,(2)the positions of nearby observations do not fall on a curve with non-zero intercept whose degree is less or equal to the order of mean square differentiability of the *** conditions are easy to verify in *** rates of the asymptotic screening effect are also *** rates depend on the rate of decrease of the spectral *** studies on the screening effect for finite samples are also provided.

关键词： Spatial statistics spectral analysis kriging screening effect

Effects of marine sediment on the response of a submerged floating tunnel due to p- wave incidence

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Acta Mechanica Sinica 2019年第4期35卷 773-785页

作者： Heng Lin Yiqiang Xiang Zhengyang Chen ying yang Department of Civil Engineering College of Civil Engineering and ArchitectureZhejiang University Hangzhou 310058 China

Submerged floating tunnel (SFT) is a novel type traffic structure for crossing long strait and deep lakes. To investigate the dynamic pressure acting on an SFT under compression (P) wave incidence, a theoretical analysis model considering marine sediment effect has been proposed. Based on displacement potential functions, the reflection and refraction coefficients of P wave in different media are derived. Numerical examples are employed to illustrate the effects of the thickness of sediment layer, the incident P wave angle, the tether stiffness and spacing, and the permeability of the sediment on the dynamic pressure loading on the SFT. The results show that dynamic pressure is related to the saturation of sediment and affected by the thickness of sediment. The partially saturated sediment will amplify the dynamic pressure loading on the SFT, and the resonance frequency increases a little with the fully saturated sediment. Besides, increasing the tether stiffness and decreasing in the tether spacing will lead to a dynamic pressure falling. Deepening the SFT position and reducing the permeability of the sediment are effective measures to reduce dynamic pressure acting on the SFT.

关键词： Submerged floating tunnel Dynamic pressure Porous medium P-wave Displacement potential function

Dynamic Modeling and Analysis of 9-DOF Omnidirectional Legged Vehicle

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Chinese Journal of Mechanical Engineering 2011年第4期24卷 515-521页

作者： GAO Feng WANG Guofu CUI ying yang Xinhong School of Transportation Science ＆ Engineering Beihang University Beijing 100191 China

The omnidirectional legged vehicle with steering-rails has a specific mechanism feature, and it can be controlled flexibly and accurately in omnidirectional motion. Currently there lacks further research in this area. In this paper, the mechanical characteristics of independent walking control and steering control and its kinematics principle are introduced, and a vehicle has a composite motion mode of parallel link mechanism and steering mechanism is presented. The motion direction control of the proposed vehicle is only dependant on its steering rails, so its motion is simple and effective to control. When the relative motion between the walking and steering is controlled cooperatively, the vehicle can walk perfectly. By controlling the steering rails, the vehicle can walk along arbitrary trajectory on the ground. To achieve a good result of motion control, an equivalent manipulator model needs to be built. In terms of the mechanism feature and the kinematic principle, the simplified manipulator model consists of a rail in stance phase, a rail in swing phase, and an equivalent leg. Considering the ground surface slope during walking, a parameter of inclination angle is added. Based on such a RPP manipulator model, the equations of motion are derived by means of Lagrangian dynamic approach. To verify the dynamic equations, the motion of the manipulator model is simulated based on linear and nonlinear motion planning. With the same model and motion parameters, the dynamic equations can be solved by Matlab and the calculation data can be gained. Compared with the simulation data, the result confirms the manipulator dynamic equations are correct. As a result of such special characteristics of the legged mechanism with steering rails, it has a potential broad application prospects. The derivation of dynamics equation could benefit the motion control of the mechanism.

关键词： legged vehicle omnidirectional motion steering rails dynamic modeling dynamic simulation

Fluid Pump Using a Bar-shaped Piezoelectric Transducer

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Chinese Journal of Mechanical Engineering 2011年第6期24卷 1130-1135页

作者： JIN Jiamei WANG Yin yang ying ZHANG Jianhui State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China

There are two kinds of piezoelectric pumps:check valve pumps and valve-less *** to use a check valve or not depends upon the application *** achieve large backpressure for higher flow rates,the pump with check valve is ***,adding check valves implies more complex structure and higher probability of valve blocking,*** order to solve the problem,effective driving and transport mechanics with compact construction and reliable service are being *** this paper,using the second-order longitudinal vibration mode of a bar-shaped piezoelectric vibrator for driving fluid,a piezoelectric pump is successfully *** proposed piezoelectric pump consists of coaxial cylindrical shells and a bar-shaped piezoelectric vibrator,which has a disk part and a cone *** lead zirconium titanate ceramic rings fixed in the vibrator are polarized along the thickness *** the second-order longitudinal vibration of the vibrator along its axis is excited,the disk part of the vibrator changes periodically the volume of the chamber and the cone part acts as a pin valve,driving the fluid from the inlet port to the outlet *** elements analysis on the proposed pump model is carried out to verify its operation principle and design by the commercial FEM software *** of the piezoelectric pump were manufactured,assembled,and tested for flow rate and backpressure to validate the concepts of the proposed pump and confirm the simulation results of modal and harmonic *** test results show that the performance of the proposed piezoelectric pump is about 910 mL/min in flow rate with a highest pressure level of 1.5 kPa under 400 V peak-to-peak voltage and 51.7 kHz operating *** is confirmed that this bar-shaped piezoelectric transducer can be effectively applied in fluid transferring mechanism of pump through this research.

关键词： piezoelectric pump check valve longitudinal vibration mode FEM simulation bar-shaped transducer

Sleeping of a Complex Brain Networks with Hierarchical Organization

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Communications in Theoretical Physics 2009年第1期51卷 97-100页

作者： ZHANG ying-Yue yang Qiu-ying CHEN Tian-Lun Department of Physics Nankai University Tianjin 300071 China

The dynamical behavior in the cortical brain network of macaque is studied by modeling each cortical area with a subnetwork of interacting excitable neurons. We characterize the system by studying how to perform the transition, which is now topology-dependent, from the active state to that with no activity. This could be a naive model for the wakening and sleeping of a brain-like system, i.e., a multi-component system with two different dynamical behavior.

关键词： self-organized criticality hierarchical organization EEG-like wave cortical network sleeping