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Peridynamic Modeling of Brittle Fracture in Mindlin-Reissner Shell Theory

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Computer Modeling in Engineering & Sciences 2022年第5期131卷 715-746页

作者： sai li xin Lai lisheng liu Department of Engineering Structure and Mechanics Wuhan University of TechnologyWuhan430070China Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics Wuhan University of TechnologyWuhan430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China

In this work,wemodeled the brittle fracture of shell structure in the framework of Peridynamics Mindlin-Reissener shell theory,in which the shell is described by material points in themean-plane with its drilling rotation neglected in kinematic *** improve the numerical accuracy,the stress-point method is utilized to eliminate the numerical instability induced by the zero-energy mode and *** crack surface is represented explicitly by stress points,and a novel general crack criterion is proposed based on *** of the critical stretch used in common peridynamic solid,it is convenient to describe thematerial failure by using the classic constitutive model in continuum *** this work,a concise crack simulation algorithm is also provided to describe the crack path and its development,in order to simulate the brittle fracture of the shell *** examples are presented to validate and demonstrate our proposed *** reveal that our model has good accuracy and capability to represent crack propagation and branch spontaneously.

关键词： Peridynamic brittle fracture Reissner-Mindlin shell theory

Quantitative structure-activity relationship study on the biodegradation of acid dyestuffs

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Journal of Environmental Sciences 2007年第7期19卷 800-804页

作者： li Yin xi Dan-li College of Environmental Science and Engineering Dong Hua University Shanghai 201620 China.

Quantitative structure-biodegradability relationships （QSBRs） were established to develop predictive models and mechanistic explanations for acid dyestuffs as well as biological activities. With a total of four descriptors, molecular weight （MW）, energies of the highest occupied molecular orbital （EHOMO）, the lowest unoccupied molecular orbital （ELUMO）, and the excited state （EES）, calculated using quantum chemical semi-empirical methodology, a series of models were analyzed between the dye biodegradability and each descriptor. Results showed that EHOMO and Mw were the dominant parameters controlling the biodegradability of acid dyes. A statistically robust QSBR model was developed for all studied dyes, with the combined application of EHOMO and Mw. The calculated biodegradations fitted well with the experimental data monitored in a facultative-aerobic process, indicative of the reliable prediction and mechanistic character of the developed model.

关键词： quantitative structure-activity relationship (QSAR) acid dyestuff biodegradability decolorization

Fractal Characteristics and Prediction of Backsilting Quantity in Yangtze Estuary Deepwater Channel

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China Ocean Engineering 2018年第3期32卷 341-346页

作者： li Lan-xi PAN Yun li li Business School Hohai University Marine Science and Technology College Zhejiang Ocean University Institute of Port Coastal and Offshore Engineering Ocean Collage Zhejiang University

Fractal interpolation has been an important method applied to engineering in recent years. It can not only be used to fit smooth curve and stationary data but also show its unique superiorities in the fatting of non-smooth curve and non-stationary data. Through analyzing such characteristic values as average value, standard deviations, skewness and kurtosis of measured backsilting quantities in the Yangtze Estuary 12.5 m Deepwater Channel during2011–2017, the fractal interpolation method can be used to study the backsilting quantity distribution with *** to the fractal interpolation made on the channel backsilting quantities from January 2011 to December2017, there was a good corresponding relationship between the annual(monthly) siltation quantities and the vertical scaling factor. On this basis, a calculation formula for prediction of the backsilting quantity in the Yangtze Estuary Deepwater Channel was constructed. With the relationship between the predicted annual backsilting quantities and the vertical scaling factor, the monthly backsilting quantities can be obtained. Thus, it provides a new method for estimating the backsilting quantity of the Yangtze Estuary Deepwater Channel.

关键词： Yangtze Estuary Deepwater Channel backsilting quantity fractal interpolation prediction

Square-mean Almost Periodic Solutions to Some Stochastic Evolution Equations

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Acta Mathematica Sinica,English Series 2014年第5期30卷 881-898页

作者： xi liang li School of Mathematics and Information Sciences Shandong Institute of Business and Technology

This paper concerns the square-mean almost periodic mild solutions to a class of abstract nonautonomous functional integro-differential stochastic evolution equations in a real separable Hilbert space. By using the so-called ＂Acquistapace–Terreni＂ conditions and the Banach fixed point theorem, we establish the existence, uniqueness and the asymptotical stability of square-mean almost periodic solutions to such nonautonomous stochastic differential equations. As an application, almost periodic solution to a concrete nonautonomous stochastic integro-differential equation is considered to illustrate the applicability of our abstract results.

关键词： Square-mean almost periodicity functional integro-differential equations "AcquistapaceTerreni" conditions evolution family

Upregulated lncRNA PRNT promotes progression and oxaliplatin resistance of colorectal cancer cells by regulating HIPK2 transcription

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World Journal of Gastrointestinal Oncology 2024年第4期16卷 1564-1577页

作者： sai-Nan li Shan Yang Hao-Qi Wang Tian-li Hui Meng Cheng xi Zhang Bao-Kun li Gui-Ying Wang The First Department of Surgery The Fourth Hospital of Hebei Medical UniversityShijiazhuang 050011Hebei ProvinceChina The Second Department of Surgery The Fourth Hospital of Hebei Medical UniversityShijiazhuang 050011Hebei ProvinceChina Department of General Surgery The Second Hospital of Hebei Medical UniversityShijiazhuang 050000Hebei ProvinceChina

BACKGROUND Colorectal cancer(CRC)is the third most common cancer and a significant cause of cancer-related mortality *** to chemotherapy,especially during CRC treatment,leads to reduced effectiveness of drugs and poor patient *** noncoding RNAs(lncRNAs)have been implicated in various pathophysiological processes of tumor cells,including chemotherapy resistance,yet the roles of many lncRNAs in CRC remain *** To identify and analyze the lncRNAs involved in oxaliplatin resistance in CRC and to understand the underlying molecular mechanisms influencing this *** Gene Expression Omnibus datasets GSE42387 and GSE30011 were reanalyzed to identify lncRNAs and mRNAs associated with oxaliplatin *** bioinformatics tools were employed to elucidate molecular *** expression levels of lncRNAs and mRNAs were assessed via quantitative reverse transcription-polymerase chain *** assays,including MTT,wound healing,and Transwell,were conducted to investigate the functional implications of lncRNA *** between lncRNAs and trans-cription factors were examined using RIP and luciferase reporter assays,while Western blotting was used to confirm downstream ***,a xenograft mouse model was utilized to study the in vivo effects of lncRNAs on chemotherapy *** LncRNA prion protein testis specific(PRNT)was found to be upregulated in oxaliplatin-resistant CRC cell lines and negatively correlated with homeodomain interacting protein kinase 2(HIPK2)*** was demonstrated to sponge transcription factor zinc finger protein 184(ZNF184),which in turn could regulate HIPK2 *** expression of PRNT influenced CRC cell sensitivity to oxaliplatin,with overexpression leading to decreased sensitivity and decreased expression reducing *** RIP and luciferase reporter assays indicated that ZNF184 and HIPK2 are targets of *** PRNT/ZNF184

关键词： Colorectal cancer Oxaliplatin resistance Prion protein testis specific Zinc finger protein 184 Homeodomain interacting protein kinase 2

Quasi-static simulation of droplet morphologies using a smoothed particle hydrodynamics multiphase model

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Acta Mechanica Sinica 2019年第1期35卷 32-44,I0002页

作者： xiangwei Dong Jianlin liu sai liu Zengliang li Department of Engineering Mechanics College of Pipeline and Civil EngineeringChina University of Petroleum (East China)Qingdao 266580China College of Mechanical and Electronic Engineering China University of Petroleum (East China)Qingdao 266580China

Numerical simulation of the morphology of a droplet deposited on a solid surface requires an efficient description of the three-phase contact line. In this study, a simple method of implementing the contact angle is proposed, combined with a robust smoothed particle hydrodynamics multiphase algorithm (Zhang 2015). The first step of the method is the creation of the virtual liquid-gas interface across the solid surface by means of dummy particles, thus the calculated surface tension near the triple point serves to automatically modulate the dynarnic contact line towards the equilibrium state. We simulate the evolution process of initially square liquid lumps on fiat and curved surfaces. The predictions of droplet profiles are in good agreement with the analytical solutions provided that the macroscopic contact angle is accurately implemented. Compared to the normal correction method, the present method is straightforward without the need to manually alter the normal vectors. This study presents a robust algorithm capable of capturing the physics of the static welling. It may hold great potentials in bio-inspired superhydrophobic surfaces, oil displacement, microfluidics, ore floatation, etc.

关键词： Smoothed particle hydrodynamics Virtual interface method Multiphase flow Macroscopic contact angle Droplet morphology Curved surfaces

Convergence,boundedness,and ergodicity of regime-switching diusion processes with infinite memory

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Frontiers of Mathematics in China 2021年第2期16卷 499-523页

作者： Jun li Fubao xi School of Mathematics and Statistics Beijing Institute of TechnologyBeijing 100081China Department of Applied Mathematics Lanzhou University of TechnologyLanzhou 730050China Beijing Key Laboratory on MCAACI Beijing Institute of TechnologyBeijing 100081China

We study a class of diffusion processes, which are determined by solutions X(t) to stochastic functional differential equation with infinite memory and random switching represented by Markov chain Λ(t): Under suitable conditions, we investigate convergence and boundedness of both the solutions X(t) and the functional solutions Xt: We show that two solutions (resp., functional solutions) from different initial data living in the same initial switching regime will be close with high probability as time variable tends to infinity, and that the solutions (resp., functional solutions) are uniformly bounded in the mean square sense. Moreover, we prove existence and uniqueness of the invariant probability measure of two-component Markov-Feller process (Xt,Λ(t));and establish exponential bounds on the rate of convergence to the invariant probability measure under Wasserstein distance. Finally, we provide a concrete example to illustrate our main results.

关键词： Regime-switching diffusion process infinite memory convergence boundedness Feller property invariant measure Wasserstein distance

One stone two birds:Dual-effect kinetic regulation strategy for practical lithium–sulfur batteries

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Journal of Energy Chemistry 2022年第2期31卷 302-303页

作者： xi-Yao li Qiang Zhang Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

lithium–sulfur(li–S)batteries are deemed as one of the most promising energy storage systems due to their ultrahigh theoretical energy density of 2600 Wh kg^(-1) far beyond the current lithium-ion battery technique[1].

关键词： battery lithium Dual

Nonlinear Coupled Dynamics Analysis of A Truss Spar Platform

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China Ocean Engineering 2016年第6期30卷 835-850页

作者： li Cheng-xi ZHANG Jun Department of Mechanical Engineering Massachusetts Institute of Technology Department of Civil Engineering Texas A&M UniversityCollege Station

Accurate prediction of the offshore structure motion response and associate mooring line tension is important in both technical applications and scientific research. In our study, a truss spar platform, operated in Gulf of Mexico, is numerically simulated and analyzed by an in-house numerical code ＇COUPLE＇. Both the platform motion responses and associated mooring line tension are calculated and investigated through a time domain nonlinear coupled dynamic analysis. Satisfactory agreement between the simulation and corresponding field measurements is in general reached, indicating that the numerical code can be used to conduct the time-domain analysis of a truss spar interacting with its mooting and riser system. Based on the comparison between linear and nonlinear results, the relative importance of nonlinearity in predicting the platform motion response and mooring line tensions is assessed and presented. Through the coupled and quasi-static analysis, the importance of the dynamic coupling effect between the platform hull and the mooting/riser system in predicting the mooting line tension and platform motions is quantified. These results may provide essential information pertaining to facilitate the numerical simulation and design of the large scale offshore structures.

关键词： coupled dynamic analysis nonlinear effect hybrid wave model (HWMO