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On the consistency of two-phase local/nonlocal piezoelectric integral model

Applied Mathematics and Mechanics(English Edition) 2021年第11期42卷 1581-1598页

作者： Yanming ren Hai QING State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China

In this paper,we propose general strain-and stress-driven two-phase local/nonlocal piezoelectric integral models,which can distinguish the difference of nonlocal effects on the elastic and piezoelectric behaviors of *** nonlocal piezoelectric model is transformed from integral to an equivalent differential form with four constitutive boundary conditions due to the difficulty in solving intergro-differential equations *** nonlocal piezoelectric integral models are used to model the static bending of the Euler-Bernoulli piezoelectric beam on the assumption that the nonlocal elastic and piezoelectric parameters are coincident with each *** governing differential equations as well as constitutive and standard boundary conditions are *** is found that purely strain-and stress-driven nonlocal piezoelectric integral models are ill-posed,because the total number of differential orders for governing equations is less than that of boundary ***,the traditional nonlocal piezoelectric differential model would lead to inconsistent bending response for Euler-Bernoulli piezoelectric beam under different boundary and loading *** nominal variables are introduced to normalize the governing equations and boundary conditions,and the general differential quadrature method(GDQM)is used to obtain the numerical *** results from current models are validated against results in the *** is clearly established that a consistent softening and toughening effects can be obtained for static bending of the Euler-Bernoulli beam based on the general strain-and stress-driven local/nonlocal piezoelectric integral models,respectively.

关键词： nonlocal piezoelectric integral model softening effect toughening effect general differential quadrature method(GDQM)

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泥石流中细粒石直径对小箱梁桥桥墩冲击力影响

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科学技术创新 2025年第1期 141-144页

作者：任炫知四川建筑职业技术学院四川德阳

我国部分地区经常遭受泥石流影响,桥梁经常会倒塌,桥梁受到泥石流冲击的过程中其受到的冲击力有很大的不确定性。为研究小箱梁桥上部结构在泥石流冲击下的动力学影响,本文基于欧拉-拉格朗日流固耦合理论,建立了泥石流浆体、粒状泥石流... 详细信息

我国部分地区经常遭受泥石流影响,桥梁经常会倒塌,桥梁受到泥石流冲击的过程中其受到的冲击力有很大的不确定性。为研究小箱梁桥上部结构在泥石流冲击下的动力学影响,本文基于欧拉-拉格朗日流固耦合理论,建立了泥石流浆体、粒状泥石流、小箱梁桥梁有限元模型。以广东罗定市罗镜桥为研究对象,分析泥石流冲击下桥梁。分析结果显示:泥石流浆液中粒状石的直径对桥墩的冲击力具有显著影响。

关键词：小箱梁桥细粒石泥石流有限元分析

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Dipole Oscillation in a Bose–Fermi Superfluid Mixture of ^(41)K and ~6Li

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Chinese Physics Letters 2018年第4期35卷 78-81页

作者： ren Zhang Department of Applied Physics School of Science Xi＇an Jiaotong University Xi＇an 710049 Institute for Advanced Study Tsinghua University Beijing 100084

We study the relation between the bosonic frequency shift of a dipole oscillation and the fermionic compressibility in a Bose-Fermi super fluid mixture. Our results show that the A transition occurs in such a system, which interprets the perplexing phenomenon observed in the recent experiment [arXiv：1705.04496]. In that experiment,the frequency shift of the bosonic gas was measured with different fermion-fermion s-wave scattering lengths af. The most striking feature of their measurement is that the frequency shift shows a puzzling non-monotonic behavior around 1/kFaf（？）-0.2 with kF being the Fermi momentum. In the present work, the relation between the bosonic frequency shift and the compressibility of the Fermi gas is revealed by means of the equation of state of the super fluid mixture. Making use of the relation, we find that the compressibility of Fermi gas shows a ∧-like shape around 1/kFaf（？）-0.2. We would like to stress that no free parameter is used in our calculation and our results can be further testified in a future experiment.

关键词： Fermi Superfluid Mixture of Dipole Oscillation in a Bose K and length Li

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Synthesis and mechanism analysis of a new oil soluble viscosity reducer for flow improvement of Chenping heavy oil

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Chinese Journal of Chemical Engineering 2022年第5期35卷 58-67页

作者： Yaqi ren Shuqian Xia School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China

Oil soluble viscosity reducers have gradually attracted the attention of petrochemical research due to their cleanliness and high *** the high viscosity and non-Newtonian fluid properties of Chenping heavy oil found in China,a series of new oil soluble viscosity reducers with different proportions and molecular weights were prepared by free radical polymerization using octadecyl acrylate,2-allylphenol and N-methylolacrylamide as *** viscosity reducer was applied to different types of heavy oil and found that it exhibited a better effect on heavy oils with high asphaltene *** test of rheological behavior of heavy oil with additive was performed at wide range of shear rate(3–90 s^(-1))and temperature range(30–100°C).The apparent viscosity reduction rate was up to 70.09%,which was better than the industrially relevant ethylene–vinyl acetate copolymer under the same test *** addition,the effect of viscosity reducers on the components of heavy oil and the energy change of the system simulated by molecular dynamics simultaneously was *** consistency of the simulated and experimental results show that the effect of viscosity reduction closely related to the crystallization process of wax and the viscosity reducer can reconstruct the surface structure of asphaltene and diminish the connection of benzene ring.

关键词： Heavy oil Viscosity reduction Asphaltene Non-Newtonian fluid

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Resilient control of flexible hypersonic vehicles against unmatched distributed faults

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Chinese Journal of Aeronautics 2024年第5期37卷 60-70页

作者： Dong ZHAO Wenjing ren School of Artificial Intelligence Anhui UniversityHefei 230601China Key Laboratory of System Control and Information Processing Ministry of EducationShanghai Jiao Tong UniversityShanghai 200240China School of Electrical Engineering and Automation Hefei University of TechnologyHefei 230009China

This paper studies a robust fault compensation and vibration suppression problem of flexible hypersonic *** controlled plant is represented by a cascade system composed of a nonlinear Ordinary Differential Equation(ODE)and an Euler-Bernoulli Beam Equation(EBBE),in which the vibration dynamics is coupled with the rigid dynamics and suffers from distributed faults.A state differential transformation is introduced to transfer distributed faults to an EBBE boundary and a longitudinal dynamics is refined by utilizing T-S fuzzy IF-THEN rules.A novel T-S fuzzy based fault-tolerant control algorithm is developed and related stability conditions are *** robust exponential stability and well-posedness are proved by using the modified l_(0)-semigroup based Lyapunov direct approach.A simulation study on the longitudinal dynamics of flexible hypersonic vehicles effectively verifies the validity of the developed theoretical results.

关键词： Flexible hypersonic vehicles ODE-EBBE cascade Robust exponential stability Unmatched distributed fault compensation Vibration suppression

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Trends and Potential of Machine Learning and Deep Learning in Drug Study at Single-Cell Level

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Research 2023年第4期2023卷 145-162页

作者： ren Qi Quan Zou Yangtze Delta Region Institute(Quzhou) University of Electronic Science and Technology of ChinaQuzhou 324000China School of Life Science and Technology University of Electronic Science and Technology of ChinaChengduChina Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengduChina.

Cancer treatments always face challenging problems,particularly drug resistance due to tumor cell *** existing datasets include the relationship between gene expression and drug sensitivities;however,the majority are based on tissue-level *** drugs at the single-cell level are perspective to overcome minimal residual disease caused by subclonal resistant cancer cells retained after initial curative ***,machine learning techniques can help us understand how different types of cells respond to different cancer drugs from the perspective of single-cell gene *** modeling using single-cell data and drug response information will not only improve machine learning for cell-drug outcome prediction but also facilitate the discovery of drugs for specific cancer subgroups and specific cancer *** this paper,we review machine learning and deep learning approaches in drug *** analyzing the application of these methods on cancer cell lines and single-cell data and comparing the technical gap between single-cell sequencing data analysis and single-cell drug sensitivity analysis,we hope to explore the trends and potential of drug research at the single-cell data level and provide more inspiration for drug research at the single-cell *** anticipate that this review will stimulate the innovative use of machine learning methods to address new challenges in precision medicine more broadly.

关键词： drugs expression overcome

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AOGAN:A generative adversarial network for screen space ambient occlusion

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Computational Visual Media 2022年第3期8卷 483-494页

作者： Lei ren Ying Song Zhejiang Sci-Tech University Hangzhou 310018China 2011 Collaborative Innovation Center for Garment Personal Customization of Zhejiang Province China Key Lab of Silk and Culture Heritage and Products Design Digital Technology Ministry of Culture and TourismChina

Ambient occlusion(AO)is a widely-used real-time rendering technique which estimates light intensity on visible scene ***,a number of learning-based AO approaches have been proposed,which bring a new angle to solving screen space shading via a unified learning framework with competitive quality and ***,most such methods have high error for complex scenes or tend to ignore *** propose an end-to-end generative adversarial network for the production of realistic AO,and explore the importance of perceptual loss in the generative model to AO *** attention mechanism is also described to improve the accuracy of details,whose effectiveness is demonstrated on a wide variety of scenes.

关键词： ambient occlusion(AO) attention mechanism generative adversarial network(GAN) perceptual loss

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A statistical inference for generalized Rayleigh model under Type-Ⅱ progressive censoring with binomial removals

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Journal of Systems Engineering and Electronics 2020年第1期31卷 206-223页

作者： ren Junru GUI Wenhao Department of Mathematics Beijing Jiaotong University

This paper considers the parameters and reliability characteristics estimation problem of the generalized Rayleigh distribution under progressively Type-Ⅱ censoring with random removals,that is,the number of units removed at each failure time follows the binomial *** maximum likelihood estimation and the Bayesian estimation are *** the meanwhile,through a great quantity of Monte Carlo simulation experiments we have studied different hyperparameters as well as symmetric and asymmetric loss functions in the Bayesian estimation procedure.A real industrial case is presented to justify and illustrate the proposed *** also investigate the expected experimentation time and discuss the influence of the parameters on the termination point to complete the censoring test.

关键词： Type-Ⅱprogressive censoring with random removals generalized Rayleigh distribution reliability characteristic maximum likelihood estimation Markov chain Monte Carlo method expected experimentation time

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Containment Control of Multi-Agent Systems with Stochastic Multiplicative Noises

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Journal of Systems Science & Complexity 2022年第3期35卷 909-930页

作者： ren Junhao ZONG Xiaofeng School of Automation China University of GeosciencesWuhan 430074China Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems Wuhan 430074China Engineering Research Center of Intelligent Technology for Geo-Exploration Ministry of EducationWuhan 430074China

This paper investigates the containment problem of continuous-time multi-agent systems with multiplicative noises,where the first-order and second-order multi-agent systems are studied *** on stochastic analysis tools,algebraic graph theory,and Lyapunov function method,the containment protocols based the relative states measurement with multiplicative noises are developed to guarantee the mean square and almost sure ***,the sufficient conditions and necessary conditions related to the control gains are derived for achieving mean square and almost sure *** is also shown that multiplicative noises may works positively for the almost sure containment of the first-order multi-agent *** examples are also introduced to illustrate the effectiveness of the theoretical results.

关键词： Containment control multi-agent system multiplicative noises stochastic system

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Dynamics of a D’Alembert wave and a soliton molecule for an extended BLMP equation

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Communications in Theoretical Physics 2021年第3期73卷 23-27页

作者： Bo ren Institute of Nonlinear Science Shaoxing UniversityShaoxing312000China

The D’Alembert solution of the wave motion equation is an important basic formula in linear partial differential *** study of the D’Alembert wave is worthy of deep consideration in nonlinear partial differential *** this paper,we construct a(2+1)-dimensional extended Boiti-Leon-Manna-Pempinelli(eBLMP)equation which fails to pass the Painleve *** D’Alembert-type wave of the eBLMP equation is still obtained by introducing one arbitrary function of the traveling-wave *** multi-solitary wave which should satisfy the velocity resonance condition is obtained by solving the Hirota bilinear form of the eBLMP *** dynamics of the three-soliton molecule,the three-kink soliton molecule,the soliton molecule bound by an asymmetry soliton and a one-soliton,and the interaction between the half periodic wave and a kink soliton molecule from the eBLMP equation are investigated by selecting appropriate parameters.

关键词： (2+1)-dimensional extended Boiti-Leon-Manna-Pempinelli equation Painleve analysis D’Alembert waves soliton molecule

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