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Anomalous response to creep deformation from dislocation density during electrically assisted creep aging

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Rare Metals 2024年第10期43卷 5268-5283页

作者： Chang Zhou Li-Hua Zhan chun-hui Liu Ming-hui Huang College of Mechanical and Electrical Engineering Central South UniversityChangsha 410083China Light Alloys Research Institute State Key Laboratory of Precision Manufacturing for Extreme Service PerformanceCentral South UniversityChangsha 410083China

Adding numerous dislocations into metallic materials before the forming stage significantly enhances their ***,this beneficial effect of dislocation defects may not have a simple monotonic relationship with increased dislocation density during electroplastic *** is due to the complex interactions among the drifting electrons,dislocations and solute *** study explores the effect of diverse initial dislocation densities on creep deformation during electrically aided creep aging of an aluminum-lithium ***,we discovered a threshold value for the dislocation density that affects electroplastic creep,i.e.,an enhanced effect from dislocations weakens when exceeding this density threshold(an anomalous response to creep).Microstructural data also reveal that such an anomalous response originates mainly from differences in various dislocation density-tailored configurations,which can influence the dislocation motions and precipitation kinetics of the strengthening T1precipitates under the same action of pulsed *** study provides important insights into the dislocation density-mediated electroplastic creep of an aluminum-lithium alloy.

关键词： Creep aging Dislocation density Al-Cu-Li alloy Pulsed currents

Risk Assessment of Tsunamis Along the Chinese Coast Due to Earthquakes

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International Journal of Disaster Risk Science 2022年第2期13卷 275-290页

作者： chun hui Lixin Ning Changxiu Cheng Key Laboratory of Environmental Change and Natural Disaster Beijing Normal UniversityBeijing 100875China State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal UniversityBeijing 100875China Faculty of Geographical Science Beijing Normal UniversityBeijing 100875China National Tibetan Plateau Data Center Beijing 100101China

China’s coastal areas are densely populated,economically developed, and located in close proximity to several potential tsunami sources;therefore, tsunami risk cannot be ignored. This study assessed tsunami risk in coastal areas of China by developing a framework for tsunami risk assessment from the perspectives of hazards,vulnerability, and exposure. First, a probabilistic tsunami hazard assessment(PTHA) model was applied to estimate the potential tsunami sources in both local crustal faults and circum-Pacific subduction zones based on numerical simulations. The output of the PTHA includes tsunami wave height distributions along the coast. Then, an indicator system reflecting exposure and vulnerability to tsunamis in the coastal areas of China was established by using the entropy method and analytic hierarchy *** PTHA findings show that the tsunami wave height is close to 3 m on the southern coast of the Bohai Sea, the Pearl River Estuary, and the Yangtze River Delta and exceeds 2 m near the Taiwan Strait for the 2000-year return period. The results of the tsunami risk assessment show that the cities at the highest risk level(level I) include Tangshan, Yantai, and Hong Kong, while cities at the high risk level(level II) include Fuzhou, Xiamen, and Quanzhou near the Taiwan Strait and many cities on the Yangtze River Delta, the Pearl River Estuary, and the southern coast of the Bohai Sea. Our findings can provide an understanding of differences in tsunami risk between Chinese coastal cities that may be affected by tsunamis in the future.

关键词： China coast Earthquakes Probabilistic tsunami hazard assessment Tsunami exposure Tsunami risk Vulnerability

Hydrolysis Process of the Anticancer Agents Novel Non-classical trans-Platinum(Ⅱ) with Aliphatic Amines

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Chinese Journal of Structural Chemistry 2007年第8期26卷 962-972页

作者： yuan Qing-hui ZHOU Li-Xin Department of Chemistry Jinan University Guangzhou Guangdong 510632 China

The hydrolysis process of the anticancer agents novel non-classical transplatinum（ Ⅱ ） with aliphatic amines and the influence of solvent models therein have been studied by using hybrid density functional theory （B3LYP）. In this study, the stepwise hydrolysis, trans[PtCl2（Am）（isopropylamine）] ＋ 2H2O → trans-[Pt（Am）（isopropylamine）（OH2）2]^2＋＋ 2Cl^-, was explored. Implicit solvent effects were incorporated through polarized continuum models. The stationary points on the potential energy surfaces for the first and second hydrolysis steps,proceeding via a general SN2 pathway, were fully optimized and characterized. It was found that the first hydrolysis reaction is easier than the second one and the hydrolysis of trans- [PtCl2-（isopropylamine）2] is the easiest in our studying systems. The result can assist in under- tanding the hydrolysis mechanism of trans-[PtCl2（Am）（isopropylamine）] and designing novel Pt-based anticancer drugs.

关键词： hydrolysis DFT non-classical trans-platinum aliphatic amines transition state

Cognitive improvement following transvenous adipose-derived mesenchymal stem cell transplantation in a rat model of traumatic brain injury

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Neural Regeneration Research 2011年第10期6卷 732-737页

作者： Dongfei Li chun Yang Rongmei Qu huiying Yang Meichun Yu hui Tao Jingxing Dai Lin yuan Key Laboratory of Tissue Construction and Detection of Guangdong Province Department of Anatomy Southern Medical UniversityGuangzhou 510515 Guangdong Province China

The effects of adipose-derived mesenchymal stem cell (ADMSC) transplantation for the repair of traumatic brain injury remain poorly understood. The present study observed neurological functional changes in a rat model of traumatic brain injury following ADMSC transplantation via the tail vein. Cell transplants were observed in injured cerebral cortex, and expression of brain-derived nerve growth factor was significantly increased in the injured hippocampus following transplantation. Results demonstrated that transvenous ADMSC transplants migrated to the injured cerebral cortex and significantly improved cognitive function.

关键词： adipose-derived mesenchymal stem cells traumatic brain injury brain-derived nerve growth factor cortex stem cell transplantation neural regeneration

Splitting of Operators and Operator Equations

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Acta Mathematica Sinica,English Series 2023年第6期39卷 1085-1100页

作者： chun yuan DENG Wan Yu ZHANG School of Mathematics Science South China Normal UniversityGuangzhou 510631P.R.China

In this paper,we consider the splitting operators into the product of two positive *** given operators A and T∈B(H)with A≥0 and R(A)=R(T),if T can be splitted as T=AX for some positive operator X,then the existence of X and the properties of T are *** related research are the solutions of operator equations T=XAX and TX=XAX,which have some particular properties and broad applications in many *** conditions for the existence of solutions or idempotent solutions of these kinds of equations are studied and new representations of the general solutions are given.

关键词： Projection positive operator operator equation Moore-Penrose inverse

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基于半导体桥芯片的钝感高瞬发底火设计

火工品 2025年第1期 7-12页

作者：牛惠媛任炜褚恩义李慧常英珂金豪杰陕西应用物理化学研究所瞬态化学效应与控制全国重点实验室陕西西安710061 杭州电子科技大学微电子研究院浙江杭州310018

针对超高速射武器弹药对高频高安全及高一致性点火的发展需求,基于半导体桥芯片点火技术,设计了一种新型钝感高瞬发底火。通过对比研究4种半导体桥芯片及其2种封装结构,选用斯蒂芬酸铅和亚铁氢化铅/高氯酸钾作为两级复合装药,优化形成... 详细信息

针对超高速射武器弹药对高频高安全及高一致性点火的发展需求,基于半导体桥芯片点火技术,设计了一种新型钝感高瞬发底火。通过对比研究4种半导体桥芯片及其2种封装结构,选用斯蒂芬酸铅和亚铁氢化铅/高氯酸钾作为两级复合装药,优化形成了模块化结构的半导体桥底火样机。该底火满足了与弹药接口的匹配要求,并达到1 A 1 W 5 min不发火的安全性要求。发火性能试验表明,所研制的半导体桥底火作用时间不大于200μs,散布不大于30μs,与传统桥丝电底火相比瞬发度和作用时间一致性显著提高,综合性能更好。

关键词：底火半导体桥模块化设计高瞬发高安全

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Wide-ranging Force Responsive Composites based on 1,2-Dioxetane and ZnS as Luminescent Probes in Polyurethanes

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Chinese Journal of Polymer Science 2023年第8期41卷 1162-1168,I0005页

作者： Jin-hui Zhang Shuang Liu yuan yuan Yu-Lan Chen Department of Chemistry Tianjin Key Laboratory of Molecular Optoelectronic ScienceTianjin UniversityTianjin 300354Chin State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun 130012Chin

Combining the advantages of mechanochemiluminescence from 1,2-dioxetane and elastico-mechanoluminescence from ZnS particles,a new kind of mechanoluminescent polymer composites are *** can emit bright luminescence with two distinct colors at different strains,empowering a verstaile mechanochemical strategy for force sensing and damage detection at a wider force responsive range.

关键词： Mechanochemiluminescence 1,2-Dioxetane Elastico-mechanoluminescence ZnS Polymer composites

Liver fibrosis and hepatic stellate cells: Etiology, pathological hallmarks and therapeutic targets

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World Journal of Gastroenterology 2016年第48期22卷 10512-10522页

作者： Chong-Yang Zhang Wei-Gang yuan Pei He Jia-hui Lei chun-Xu Wang Department of Pathogenic Biology School of Basic Medicine Tongji Medical College Huazhong University of Science and Technology Department of Anthropotomy School of Basic Medicine Tongji Medical College Huazhong University of Science and Technology Department of Obstetrics and Gynecology Wuhan NO.1 Hospital Affiliated with Tongji Medical College Huazhong University of Science and Technology

Liver fibrosis is a reversible wound-healing process aimed at maintaining organ integrity, and presents as the critical pre-stage of liver cirrhosis, which will eventually progress to hepatocellular carcinoma in the absence of liver transplantation. Fibrosis generally results from chronic hepatic injury caused by various factors, mainly viral infection, schistosomiasis, and alcoholism; however, the exact pathological mechanisms are still unknown. Although numerous drugs have been shown to have antifibrotic activity in vitro and in animal models, none of these drugs have been shown to be efficacious in the clinic. Importantly, hepatic stellate cells(HSCs) play a key role in the initiation, progression, and regression of liver fibrosis by secreting fibrogenic factors that encourage portal fibrocytes, fibroblasts, and bone marrow-derived myofibroblasts to produce collagen and thereby propagate fibrosis. These cells are subject to intricate cross-talk with adjacent cells, resulting in scarring and subsequent liver damage. Thus, an understanding of the molecular mechanisms of liver fibrosis and their relationships with HSCs is essential for the discovery of new therapeutic targets. This comprehensive review outlines the role of HSCs in liver fibrosis and details novel strategies to suppress HSC activity, thereby providing new insights into potential treatments for liver fibrosis.

关键词： Liver cirrhosis Fibrosis Hepatic stellate cells Etiology Pathology Treatment

Self-organization of Reconfigurable Protocol Stack for Networked Control Systems

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International Journal of Automation and computing 2011年第2期8卷 221-235页

作者： chun-Jie Zhou hui Chen yuan-Qing Qin Yu-Feng Shi Guang-Can Yu Key Laboratory of Ministry of Education for Image Processing and Intelligent Control Department of Control Science and Engineering Huazhong University Science and Technology Wuhan 430074 PRC

In networked control systems （NCS）,the control performance depends on not only the control algorithm but also the communication protocol *** performance degradation introduced by the heterogeneous and dynamic communication environment has intensified the need for the reconfigurable protocol *** this paper,a novel architecture for the reconfigurable protocol stack is proposed,which is a unified specification of the protocol components and service interfaces supporting both static and dynamic reconfiguration for existing industrial communication *** the architecture,a triple-level self-organization structure is designed to manage the dynamic reconfiguration procedure based on information exchanges inside and outside the protocol ***,the protocol stack can be self-adaptive to various environment and system requirements through the reconfiguration of working mode,routing and scheduling ***,the study on the protocol of dynamic address management is conducted for the system of controller area network （CAN）.The results show the efficiency of our self-organizing architecture for the implementation of a reconfigurable protocol stack.

关键词： Networked control system (NCS) communication network self-organization protocol stack reconfiguration