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Reversible Mechanochemistry Enabled Autonomous Sustaining of Robustness of Polymers—An Example of Next Generation Self-healing Strategy

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Chinese Journal of Polymer Science 2021年第5期39卷 545-553,I0005页

作者： ming-xuan Li Min-Zhi Rong ming-Qiu Zhang Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education Guangdong Provincial Key Laboratory of High Performance Polymer CompositesSchool of ChemistrySun Yat-Sen UniversityGuangzhou 510275China

Even under low external force,a few macromolecules of a polymer have to be much more highly stressed and fractured first due to the inherent heterogeneous *** the materials keep on working under loading,as is often the case,the minor damages would add up,endangering the safety of *** we show an innovative solution based on mechanochemically initiated reversible cascading variation of metal-ligand *** loading,crosslinking density of the proof-of-concept metallopolymer networks autonomously increases,and recovers after ***,the stress-induced tiny fracture precursors are blocked to grow and then *** entire processes reversibly proceed free of manual intervention and *** proposed molecular-level internal equilibrium prevention mechanisms fundamentally enhance durability of polymers in service.

关键词： Metal-ligand complexations Polyurethane Mechanochemistry Mechanical properties Robustness

Mitotic inheritance of DNA methylation: more than just copy and paste

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Journal of Genetics and Genomics 2021年第1期48卷 1-13页

作者： xuan ming Bing Zhu Yingfeng Lia National Laboratory of Biomacromolecules Institute of BiophysicsChinese Academy of SciencesBeijing 100101China College of Life Sciences University of Chinese Academy of SciencesBeijing 100049China

Decades of investigation on DNA methylation have led to deeper insights into its metabolic mechanisms and biological *** understanding was fueled by the recent development of genome editing tools and our improved capacity for analyzing the global DNA methylome in mammalian *** review focuses on the maintenance of DNA methylation patterns during mitotic cell *** discuss the latest discoveries of the mechanisms for the inheritance of DNA methylation as a stable epigenetic *** also highlight recent evidence showing the rapid turnover of DNA methylation as a dynamic gene regulatory mechanism.A body of work has shown that altered DNA methylomes are common features in aging and *** discuss the potential links between methylation maintenance mechanisms and diseaseassociated methylation changes.

关键词： DNMT1 Mitotic DNA methylation inheritance Neighboring reinforcement model Aging-associated methylation changes

Evaluation of the Interface Between Two Plates by the Lamb Wave

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Chinese Physics Letters 2001年第11期18卷 1483-1486页

作者： WANG Xiao-Min LIAN Guo-xuan LI ming-xuan Institute of Acoustics Chinese Academy of SciencesBeijing 100080

A new expression of the dispersion equation of the Lamb wave in an adhesive two-layered plate is presented. The bond rigidity of the adhesive plate is accounted for in terms of a spring model. The influence of the variations of the compliance constants of the spring on the dispersion feature of Lamb modes is numerically studied. The numerical results indicate that the deterioration of the bond rigidity may cause the phase velocity decrease and the frequency-shift for a given Lamb mode, thus having a possibility for the evaluation of the bonding state of the adhesive plate by using ultrasonic wave velocity measurements. The phase-tracing method is used to measure the phase velocities experimentally and the results for an adhesive plate of aluminium-aluminium are given to verify the theoretical predictions.

关键词： plate rigidity dispersion

Application of transparent soil model tests to study the soil-rock interfacial sliding mechanism

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Journal of Mountain Science 2019年第4期16卷 935-943页

作者： WANG Zhuang LI Chi DING xuan-ming Department of Civil Engineering Inner Mongolia University of Technology Key Laboratory of New Technology for Construction of Cities in Mountain Area Ministry of Education Chongqing University

When transparent soil technology is used to study the displacement of a slope, the internal deformation of the slope can be visualized. We studied the sliding mechanism of the soil-rock slope by using transparent soil technology and considering the influence of the rock mass Barton joint roughness coefficient, angle of the soil mass, angle of the rock mass and soil thickness factors on slope stability. We obtained the deformation characteristics of the soil and rock slope with particle image velocimetry and the laser speckle technique. The test analysis shows that the slope sliding can be divided into three parts: displacements at the top, the middle, and the bottom of the slope; the decrease in the rock mass Barton joint roughness coefficient, and the increase in soil thickness, angles of the rock mass and soil mass lead to larger sliding displacements. Furthermore, we analyzed the different angles between the rock mass and soil thickness. The test result shows that the displacement of slope increases with larger angle of the rock mass. Conclusively, all these results can help to explain the soil-rock interfacial sliding mechanism.

关键词： Slope engineering Transparent soil Model test Interfacial sliding mechanism

GOAT:a simulation code for high-intensity beams

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Nuclear Science and Techniques 2023年第5期34卷 163-182页

作者： Lei Wang Jian-Cheng Yang ming-xuan Chang Fu Ma Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China

A simulation code,GOAT,is developed to simulate single-bunch intensity-dependent effects and their interplay in the proton ring of the Electron-Ion Collider in China(EicC)*** is a scalable and portable macroparticle tracking code written in Python and coded by object-oriented programming *** allows for transverse and longitudinal tracking,including impedance,space charge effect,electron cloud effect,and beam-beam *** this paper,physical models and numerical approaches for the four types of high-intensity effects,together with the benchmark results obtained through other simulation codes or theories,are presented and *** addition,a numerical application of the cross-talk simulation between the beam-beam interaction and transverse impedance is shown,and a dipole instability is observed below the respective instability *** mitigation measures implemented in the code are used to suppress the *** flexibility,completeness,and advancement demonstrate that GOAT is a powerful tool for beam dynamics studies in the EicC project or other high-intensity accelerators.

关键词： Code development Numerical methods Beam dynamics High-intensity effects

Rehabilitation of anterior pituitary dysfunction combined with extrapontine myelinolysis: A case report

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World Journal of Clinical Cases 2019年第24期7卷 4420-4425页

作者： ming-xuan Yang Xue-Nong Chen Department of Rehabilitation Affiliated Hospital of Zunyi Medical University

BACKGROUND Extramedullary myelinolysis is a rare demyelinating disease, often caused by rapid increases in serum sodium concentration in patients with *** manifestations are neuropsychiatric symptoms, limb weakness, and dysarthria. Because of its poor prognosis and high disability rate, it poses a huge burden on the global economy, societies, and families. This article reports rehabilitation in a patient with pituitary dysfunction combined with extramedullary *** SUMMARY A 27-year-old Chinese man developed anorexia, vomiting, and limb weakness and was diagnosed with pituitary insufficiency. He had low serum sodium, slow movement, muscle weakness, and muscle tone abnormalities after sodium supplementation, involuntary limb shaking, ataxia, and dysarthria. According to the symptoms and signs and imaging reports, he was diagnosed with extramedullary myelinolysis. After treatment with hormone therapy and neurotrophic drugs, motor and speech function did not improve, so he was treated in the rehabilitation department for 4 wk. The patient's physical status was improved substantially during his stay at the rehabilitation *** Patients with extramedullary myelinolysis who actively participate in rehabilitation intervention can significantly improve their activities of daily living.

关键词： Anterior pituitary dysfunction Extrapontine myelinolysis Rehabilitation Motor function Speech function Case report

Dynamic Behavior of Gravity Retaining Walls with Coral Sand Backfill Under Earthquakes:Shaking Table Tests

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China Ocean Engineering 2022年第6期36卷 839-848页

作者： ZHANG Yan-ling WANG Cheng-long DING xuan-ming WU Qi College of Civil Engineering Taiyuan University of TechnologyTaiyuan 030024China Key Laboratory of New Technology for Construction of Cities in Mountain Area School of Civil EngineeringChongqing UniversityChongqing 400045China

The retaining walls in coral sand sites are inevitably threatened by earthquakes. A series of shaking table tests were carried out to study the seismic stability of gravity retaining walls with coral sand backfill. Parallel tests with quartz sand were performed to compare and discuss the special dynamic properties of coral sand sites. The results show that the acceleration difference between the retaining wall and the coral sand backfill is 76%-92% that of the quartz sand,which corresponds to the larger liquefaction resistance of coral sand compared with the quartz sand. However, the horizontal displacement of the retaining walls with coral sand backfill reaches 79% of its own width under 0.4g vibration intensity. The risk of instability and damage of the retaining walls with coral sand backfill under strong earthquakes needs attention.

关键词： coral sand seismic response liquefaction shaking table test gravity retaining walls

Highly stable Eu-coordination polymer exhibiting the highest quantum yield

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Science China Chemistry 2023年第5期66卷 1400-1405页

作者： ming-Yu Ye ming-xuan Zhang Qiao-Fei Xu Han Xu La-Sheng Long Lan-Sun Zheng State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry College of Chemistry and Chemical EngineeringXiamenUniversityXiamen361005China

Lanthanide luminescent materials with high quantum yield and thermal stability are of key importance for their practical *** we report crystal structures and luminescent properties of[Eu(pfbz)_(2)(phen)Cl](1)and[Tb(pfbz)2(phen)Cl](2)(pfbz=Pentafluorobenzoate).Single-crystal analysis reveals that both 1 and 2 crystallize in a polar space group of *** on their luminescent properties indicates that the solid-state quantum yields of 1 and 2 are 97.7%and 90.7%,respectively,while their efficiency of the sensitization process is as high as 100%,revealing that polar structures are more favorable to obtain high quantum *** analysis reveals that both 1 and 2 can be stable up to 240℃.More importantly,temperature-dependent luminescent spectra of 1 indicate its luminescent intensity at 612 nm only decreased by 5%from room temperature to 373 K,whereas at 373 K,its luminescent intensity remains almost constant for 36 *** that1 represents the highest quantum yield among known Eu-coordination polymers and its performance as the LED material is better than that of commercially widely used luminescent materials of(Sr,Ca)Al Si N3:Eu(630 nm)and(Sr,Ca)Al Si N3:Eu(640 nm),the present work provides an excellent substitute for commercial LED materials.

关键词： lanthanide coordination polymers luminescence LED materials

Effects of topography on dynamic responses of single piles under vertical cyclic loading

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Journal of Mountain Science 2020年第1期17卷 230-243页

作者： QU Li-ming DING xuan-ming WU Chong-rong LONG Yong-hong YANG Jin-chuan College of Civil Engineering Chongqing UniversityChongqing 400045China Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing UniversityChongqing 400045China Citation:Qu LMDing

This paper describes model tests of single piles subjected to vertical cyclic compressive loading for three kinds of topography: sloping ground, level ground, and inclined bedrock. Comprehensive dynamic responses involving cyclic effects and vibration behaviours are studied under various load combinations of dynamic amplitude, mean load,frequency and number of cycles. Test results show that permanent settlement can generally be predicted with a quadratic function or power function of *** ground topography produces more pronounced settlement than level ground under the same load condition. For vibration behaviour,displacement amplitude is weakly affected by the number of cycles, while load amplitude significantly influences dynamic responses. Test results also reveal that increasing load amplitude intensifies nonlinearity and topography effects. The strain distribution in a pile and soil stress at the pile tip are displayed to investigate the vibration mechanism accounting for sloping ground effects. Furthermore, the dynamic characteristics among three kinds of topography in the elastic stage are studied using a three-dimensional finite method. Numerical results are validated by comparing with experimental results for base inclination topography. An inclined soil profile boundary causes non-axisymmetric resultant deformation, though a small difference in vertical displacement is observed.

关键词： Pile Model test Dynamic response Permanent settlement Vibration displacement Topography effects