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Deformation Calculation of Cross-section Based on Virtual Force in Thin-walled Tube Bending Process

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Chinese Journal of Mechanical Engineering 2009年第5期22卷 696-701页

作者： LIU Jingyao tang Chengtong ning Ruxin School of Mechanical Engineering Beijing lnstitute of Technology Beijing 100081 China

Cross-section deformation is one of important factors affecting the quality of tube formation, and the tube＇s capability of transporting liquid and gas will be reduced because of the cross-section ellipse deformation due to the effect of shear load in plastic bending process. When the tube is bent, the extrados-wall bears the tension stress and the intrados-wall bears the compression stress, synchronously the cross-section is affected by the circumferential stress. According to the above, the distribution function and curve of tangential stress can be obtained according to force balance differential equations on circumferential direction and Trasca rule. Subsequently the real state and virtual state moment equations were established, a new method was presented adopting the virtual principle of deformation system to calculate the x-axis and y-axis displacement of arbitrary point on cross-section. So the major and minor axes of deformed cross-section can be calculated according to the displacements of each point, and the variety value of major and minor axes will be obtained further. Finally the theoretical calculating result is compared with NC tube rotary-bending experiment results to verify the rationality of theoretical analysis, and the cross-section deformation rule of thin-walled tube can be received.

关键词： thin-walled tube stress analysis major and minor axes cross-section deformation virtual force

Rational design and synthesis of advanced metal-organic frameworks for electrocatalytic water splitting

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Science China Chemistry 2023年第4期66卷 943-965页

作者： Yu-jia tang Ya-Qian Lan School of Chemistry and Materials Science Institute of Advanced Materials and Flexible Electronics(IAMFE)Nanjing University of Information Science and TechnologyNanjing 210044China School of Chemistry South China Normal UniversityGuangzhou 510006China

As a promising and significant technology for hydrogen production,electrocatalytic water splitting is a research hotspot in the energy conversion field for alleviating the global energy crisis and achieving carbon neutrality ***-organic frameworks(MOFs)have been widely investigated as catalyst candidates with remarkable activity and long-term electrocatalysis durability owing to their precise and tailorable structures:tunable pore channels in the range of micropore/mesopore promote the mass/electron transfer;high specific surface areas expose abundant active species;modified metal nodes can serve as active sites;versatile organic ligands can be functionalized to further enhance the electrocatalytic *** this review,recent advances in the rational design and synthesis of advanced MOF electrocatalysts for water splitting are presented in the following ***,we analyze the design concepts of MOF electrocatalysts from the perspective of their distinct and modifiable ***,three common synthesis techniques of MOF electrocatalysts are briefly ***,we focus on the classification of different MOFs for robust electrocatalytic water splitting,including pristine MOFs,mixed-metallic MOFs,MOF nanosheets,electrically conductive MOFs,MOFs on substrates,and polyoxometalate-based ***,summary and outlook are proposed to uncover the next generation of advanced MOFs for electrochemical energy conversion applications.

关键词： metal-organic frameworks water splitting electrocatalysis hydrogen evolution reaction oxygen evolution reaction polyoxometalates

Dynamic Mechanical Properties and Energy Dissipation Characteristics of Frozen Soil Under Passive Confined Pressure

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Acta Mechanica Solida Sinica 2021年第2期34卷 184-203页

作者： Jinxuan jia Huaiping tang Huijian Chen Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province School of Mechanics and EngineeringSouthwest Jiaotong UniversityChengdu 610031China

Impact compression tests on frozen soil samples with different freezing temperatures and subjected to passive confined pressure were performed using a split Hopkinson pressure bar at different loading strain *** three-dimensional stress-strain curves of the frozen soil samples under the corresponding conditions were *** experimental results showed that,when the frozen soil was loaded to its elastic limit,shear failure occurred,the bearing capacity of pore ice was lost,and the thawed soil functioned as the main stress-bearing ***,the capacity of frozen soil to withstand hydrostatic pressure continued to *** dynamic mechanical properties of the frozen soil under passive confined pressure were observed to be strongly related to the loading strain rate and freezing *** the loading strain rate increased,the secant modulus,elastic modulus,and strength(including the shear strength)of the frozen soil increased,whereas its Poisson^ratio and coefficient of lateral pressure *** the freezing temperature decreased,the secant modulus,elastic modulus,and shear strength of the frozen soil increased;however,its Poisson5s ratio and coefficient of lateral pressure *** the frozen soil was subjected to impact loading under passive confined pressure,energy dissipation occurred due to plastic deformation,mesoscopic damage evolution,and ice-water phase *** shear failure occurred,the absorption energy per unit volume of frozen soil increased as the freezing temperature decreased and the loading strain rate increased.

关键词： Frozen soil Split Hopkinson pressure bar Passive confined pressure Dynamic mechanical properties Energy dissipation

Regeneration of single-atom catalysts deactivated under acid oxygen reduction reaction conditions

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Journal of Energy Chemistry 2022年第10期31卷 478-484,I0012页

作者： Chang-Xin Zhao Ding Ren Juan Wang jia-ning Liu Cheng tang Xiao Chen Bo-Quan Li Qiang Zhang Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China School of Chemical Engineering and Advanced Materials The University of AdelaideAdelaideSA 5005Australia

Single-atom catalysts serve as a promising candidate to realize noble-metal-free electrocatalytic oxygen reduction in acid ***,their poor stability under working conditions strictly restrains their practical ***,regeneration of their electrocatalytic activity is of great ***,the regeneration of a Fe-N-C single-atom catalyst is demonstrated to be feasible by a facile annealing regeneration *** activity after regeneration recovers to that of the pristine electrocatalyst and surpasses the deactivated *** regeneration mechanism is identified to be selfetching of the surface carbon layer and consequent exposure of the previously buried single-atom ***,the regeneration strategy is applicable to other single-atom *** work demonstrates the feasibility of regenerating oxygen reduction electrocatalysts and affords a pioneering approach to deal with rapid deactivation under working conditions.

关键词： Oxygen reduction reaction Single-atom catalysts Energy electrocatalysis Noble metal free Catalyst regeneration

Directly electrospinning submillimeter continuous fibers on tubes to fabricate H2S detectors with fast and high response

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Nano Materials Science 2022年第4期4卷 376-382页

作者： Xutao ning Dou tang Ming Zhang Hunan Provincial Key Laboratory of Fine Ceramics and Powder Materials School of Materials and Environmental EngineeringHunan University of HumanitiesScience and TechnologyLoudiChina College of Resources&Environment Hunan Agricultural UniversityChangsha410128China School of Physics and Electronics Hunan UniversityChangsha410082China

The fast and high response detection of neurotoxic H_(2)S is of great importance for the *** this paper,directly electrospinning technology on the ceramic tube is developed to improve the response of H_(2)S detector based on superlong SnO_(2)*** submillimeter continuous fibers are deposited directly on ceramic tubes by in-situ electrospinning method and can keep morphology of fibers during *** employing this technology,CuO-doped SnO_(2)fiber H_(2)S detectors are fabricated,and 10%atom CuO-doped SnO_(2)H_(2)S detector shows the highest response of 40 toward 1 ppm H_(2)S at 150℃while the response is only 3.6 for the H_(2)S detector prepared in traditional *** addition,the in-situ electrospinning H_(2)S detectors show faster response and recovery compared to the H_(2)S detectors fabricated by the conventional *** high and fast response of H_(2)S detectors based on in-situ electrospinning can be ascribed to the continuous fiber structure and CuO *** present in-situ electrospinning technology may provide a new strategy for the development of other gasdetectors and bio-detectors with fast and high response.

关键词： Submillimeter continuous fibers H2S detectors In-situ fabrication

Hot deformation behavior and constitutive model of TC18 alloy during compression

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Rare Metals 2014年第4期33卷 383-389页

作者： Bao-Hua jia Wei-Dong Song Hui-Ping tang Zhi-Hua Wang Xiao-Nan Mao jian-Guo ning State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology State Key Laboratory of Porous Metal Materials Northwest Institute for Nonferrous Metal Research Institute of Applied Mechanics and Biomedical Engineering Taiyuan University of Technology Northwest Institute for Nonferrous Metal Research

The hot deformation behavior of TC18 alloy at strain rates ranging from 1 × 10-4 to 1 x 10-2 s-1 and temperatures ranging from 25 to 800 ℃ was studied using a WDW-300 electronic universal testing machine. The relationships between true flow stress decreases with stress and true strain show that the increase of temperature and increases as strain rate increases. The effect of strain rate on the flow stress becomes pronounced at higher temper- atures. At room temperature, the river pattern characteristic of brittle fracture and the dimple pattern typical of ductile fracture are found to exist in different regions of fracture surfaces of the samples. An improved constitutive rela- tionship is proposed to accurately describe the flow stress of TC18 by considering the effect of strain. And a micro- scopic model is also deduced which can link the physical mechanisms to the macroscopic experimental results. A good agreement is obtained between the predictions of the microscopic model and the results of the macroscopic experiment.

关键词： TC18 titanium alloy Hot deformation Strainrate Constitutive model

Comparative proteomes change and possible role in different pathways of micro RNA-21a-5p in a mouse model of spinal cord injury

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Neural Regeneration Research 2020年第6期15卷 1102-1110页

作者： Almaghalsa-Ziad Mohammed Hong-Xia Du Hong-Liang Song Wei-Ming Gong Bin ning tang-Hong jia Department of Spinal Surgery Jinan Central Hospital Affiliated to Shandong University

Our previous study found that microRNA-21 a-5 p(miR-21 a-5 p)knockdown could improve the recovery of motor function after spinal cord injury in a mouse model,but the precise molecular mechanism remains poorly *** this study,a modified Allen's weight drop was used to establish a mouse model of spinal cord injury.A proteomics approach was used to understand the role of differential protein expression with miR-21 a-5 p knockdown,using a mouse model of spinal cord injury without gene knockout as a negative control *** found that after introducing miR-21 a-5 p knockdown,proteins that played an essential role in the regulation of inflammatory processes,cell protection against oxidative stress,cell redox homeostasis,and cell maintenance were upregulated compared with the negative control *** Encyclopedia of Genes and Genomes pathway enrichment analysis identified enriched pathways in both groups,such as the oxidative phosphorylation pathway,which is relevant to Parkinson's disease,Huntington's disease,Alzheimer's disease,and cardiac muscle *** also found that miR-21 a-5 p could be a potential biomarker for amyotrophic lateral sclerosis,as miR-21 a-5 p becomes deregulated in this *** results indicate successful detection of some important proteins that play potential roles in spinal cord *** the relationship between these proteins and the recovery of spinal cord injury will provide a reference for future research of spinal cord injury *** experimental procedures and protocols were approved by the Experimental Animal Ethics Committee of Shandong University of China on March 5,2014.

关键词： bioinformatics biomarker inflammation micro RNA mitochondria mouse pathway analysis proteomics spinal cord injury stathmin

Photothermal probiotics delivery of photodynamic agents for enhanced immunogenic cell death within hypoxia center of solid tumors

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Nano Research 2025年第1期18卷 642-652页

作者： Wen Luo Shiyu Du Yateng jiang Bangshun He Jun tang Jingjing Yang Yujun Song jiangsu Key Laboratory of Artificial Functional Materials State Key Laboratory of Analytical Chemistry for Life ScienceNational Laboratory of Solid State MicrostructuresCollege of Engineering and Applied SciencesNanjing UniversityNanjing 210023China Department of Laboratory Medicine Nanjing First HospitalNanjing Medical UniversityNanjing 210006China Department of Anesthesiology Jinling HospitalMedical School of Nanjing UniversityNanjing 210000China Department of Biochemistry and Molecular Biology School of Medicine&Holistic Integrative MedicineJiangsu Collaborative Innovation Center of Chinese Medicinal Resources IndustrializationNanjing University of Chinese MedicineNanjing 210023China

Resulting from harsh hypoxic environmental conditions,central cells in the core of solid tumors are usually more aggressive and malignant with a less stable ***,therapeutic agents with improved penetration for the activation of immunity in tumor centers exhibit promising potential in ***,polydopamine-coated Escherichia coli Nissle 1917(EcN)bearing chlorin e6(Ce6)-loaded and polyethyleneimine(PEI)-coated hollow manganese dioxide(shorted as EP-ChP)are applied for enhanced immunotherapy in deep *** accumulation in tumor center through hypoxia targeting,manganese dioxide is degradated under the tumor microenvironment with released Ce6 and thus generates reactive oxygen species(ROS)upon 660 nm laser irradiation,which can further lower thermalresistance of cancer cells via HSP90α*** to that,heating induced by polydopamine upon 808 nm laser irradiation can achieve effective tumor *** upon dual laser induces enhanced immunogenic cell death,while bacterial infections in tumor tissues also trigger innate *** bacteria-based approach provides enhanced antitumor immune responses in deep tumors with great potential in the reshaping of immunosuppression tumor microenvironment.

关键词： bacteria phototherapies immunotherapy hypoxia targeting tumor penetration

Biomass materials for zinc-based sustainable and green energy storage devices:Strategy and mechanism

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Nano Research 2025年第1期18卷 294-314页

作者： Xiaotong Yang Xiaoxin Nie Chenke tang Yiyang Xiao Qiongguang Li Du Yuan Meng Yao College of Materials Science and Engineering Changsha University of Science and TechnologyChangsha 410004China College of Materials Science and Engineering Sichuan UniversityChengdu 610065China Anhui Province International Research Center on Advanced Building Materials School of Materials and Chemical EngineeringAnhui Jianzhu UniversityHefei 230601China

As next-generation rechargeable alternatives,zincbased energy storage devices(ZESs)are being intensely explored due to their merits of abundant resource,low cost,safety and environmental ***,ZESs face a succession of critical challenges on pursuing advancing performance,including the stability and kinetics of cathode,stability and transport of zinc electrolyte,reversibility and deep utilization of metallic Zn ***,possessing unique molecular structures with abundant functionals groups,motivates the interdisciplinary field emerging from biomass and aqueous rechargeable *** its high compatibility with ZES design,we here summarize the application of biomass materials in ZESs from the aspects of cathode,electrolyte,membrane/separator and Zn anode,with their corresponding operational mechanisms and attractive functionalities from polymeric ***,the outlooks and perspectives are provided,regarding current challenges and future *** anticipate our minireview paves way on exploring the roles of biomass in aqueous rechargeable batteries.

关键词： zinc biomass materials skeleton/host coating solid-electrolyte interphase(SEI)