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Dynamic-stiffening-induced aggravated cracking behavior driven by metal-substrate-constraint in a coating/substrate system

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Journal of Materials Science & Technology 2021年第6期65卷 154-163页

作者： Guangrong Li chunhua tang Guanjun Yang State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi'an Jiaotong UniversityXi'an710049China

Air plasma sprayed thermal barrier coatings(APS-TBCs)saw their wide application in high-temperaturerelated cutting-edge *** lamellar structure of APS-TBCs provides a significant advantage on thermal ***,short life span is a major headache for *** is highly related to the property changes and passive behaviors of the coatings during thermal ***,a finite element model was developed to investigate the dynamic stiffening and substrate constraint on total spallation *** show that the stiffening accelerates the crack propagation of *** driving force for crack propagation,which is characterized by strain energy release rate(SERR),is significantly ***,the crack starts to propagate when the SERR exceeds the fracture *** addition,the changing trends of SERR and crack propagation features are highly associated with temperatures.A higher temperature corresponds to more significant effect of stiffening on substrate *** brief,temperature-dependent stiffening significantly aggravates the substrate constraint effect on APS-TBCs,which is one of the major causes for the *** that,lowering stiffening degree is essential to maintain high strain tolerance,and to further extend the life span of *** understanding contributes to the development of advanced TBCs in future applications.

关键词： Thermal barrier coatings Substrate constraint Stiffening Crack propagation Structural design

Control of Bursaphelenchus xylophilus in the State-owned Sishibacao Forest Farm of Yunyang County,China

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Agricultural Biotechnology 2023年第2期12卷 127-132页

作者： chunhua tang Hejun ZHANG Yunyang State-owned Sishibacao Forest Farm Chongqing 400000China Chongqing Bainian Forestry Technology Co. Ltd.Chongqing 400000China

In view of the fact that pine wood nematode disease is the most dominant disease in Pinus massoniana forests,which has the characteristics of strong infectivity,fast transmission speed,and great difficulty in prevention and control,a brief description was made to the occurrence status of pine wood nematode disease and difficulties faced with its control in the State-owned Sishibacao Forest Farm of Yunyang County,China,followed by the analysis on the prevention and control measures from aspects of strict control,epidemic situation monitoring,joint prevention and control,and clearance of infected trees,as well as the existing problems of pine wood nematode ***,reasonable suggestions including strengthening the construction of talent team were put forward,aiming to provide a beneficial reference for the scientific,efficient,and reasonable control of pine wood nematode disease in Pinus massoniana *** of Yunyang State-owned Sishibacao Forest Farm.

关键词： Pine wood nematode disease Occurrence status Control measures

DICER1 regulates antibacterial function of epididymis by modulating transcription of p-defensins

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Journal of Molecular Cell Biology 2019年第5期11卷 408-420页

作者： chunhua tang Minjie Ni Shengsong Xie Yao Zhang Chaobao Zhang Zimei Ni Chen Chu Ligang Wu Yuchuan Zhou Yonglian Zhang State Key Laboratory of Molecular Biology Shanghai Key Laboratory of Molecular Andrology CAS Center for Excellence in Molecular Cell Science Shanghai Institute of Biochemistry and Cell Biology Chinese Academy of Sciences University of Chinese Academy of Sciences Shanghai 200031 China

DICER1 is a key enzyme responsible for the maturation of microRNAs. Recent evidences suggested that DICER1 and microRNAs expressed in epididymis were involved in the control of male fertility. However, the exact mechanism remains to be elucidated. Here, we created a mouse line by targeted disruption of Dicerl gene in the principal cells of distal caput epididymis. Our data indicated that a set of β-defensin genes were downregulated by DICER1 rather than by microRNAs. Moreover, DICER1 was significantly enriched in the promoter of β-defensin gene and controlled transcription. Besides, the antibacterial ability of the adult epididymis significantly declined upon Dicerl deletion both in vitro and in vivo. And a higher incidence of reproductive defect was observed in middle-aged Dicerl^-|- males. These results suggest that DICER1 plays an important role in transcription of β-defensin genes, which are associated with the natural antibacterial properties in a microRNA-independent manner, and further impacts the male fertility.

关键词： epididymis antibacterial property DICER1 β-defensin

Countermeasures for the Protection and Sustainable Development of Forestry Resources

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Meteorological and Environmental Research 2023年第4期14卷 67-69页

作者： chunhua tang Jialin GU Yunyang State-owned Sishibacao Forest Farm Yunyang 404500China

Firstly,the problems of the protection and sustainable development of forestry resources were analyzed,such as lack of overall planning for the protection of forestry resources,insufficient investment in the protection of forestry resources,***,the corresponding countermeasures were proposed,such as making overall planning for sustainable forestry development,increasing the investment in the protection of forestry resources,improving the forestry management system,etc.

关键词： Protection of forestry resources Sustainable development Problems Countermeasures

ON THE GLOBAL ATTRACTIVITY FOR A NEUTRAL DIFFERENCE EQUATION WITH TWO DELAYS

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Annals of Differential Equations 1995年第4期11卷 420-427页

作者： On chunhua, Luo Wei & tang Hengsheng (Central-South Institute Of Technology, Central-South Institute of Technology 421001

This paper studies the global attractivity of the difference equation where {pn} and {qn} are sequences of nonnegative real numbers, μ, τ and δ are nonnegative integers. We estabilish some sufficient conditions whi... 详细信息

关键词： difference equation global attractivity

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响应面法优化鼠标面盖注塑成型工艺的应用

塑料 2017年第3期46卷 114-116,120页

作者：唐春华珠海城市职业技术学院机电工程学院广东珠海519090

采用响应面法(RSM)和注塑成型有限元模拟分析技术相结合的方法,解决鼠标面盖翘曲变形控制注塑成型工艺优化问题。以熔体温度、模具温度、注塑时间、保压压力为注塑工艺参数试验变量,翘曲变形值为响应优化目标,完成了基于中心复合设计(C... 详细信息

采用响应面法(RSM)和注塑成型有限元模拟分析技术相结合的方法,解决鼠标面盖翘曲变形控制注塑成型工艺优化问题。以熔体温度、模具温度、注塑时间、保压压力为注塑工艺参数试验变量,翘曲变形值为响应优化目标,完成了基于中心复合设计(CCD)的试验规划,构建了工艺参数试验变量与响应优化目标之间的响应面模型,完成了响应面模型的分析与评价,运用Design-Expert软件优化求解得到了翘曲控制注塑成型工艺优化方案,并通过模拟试验和试模注塑验证了模型的准确性,优化后的工艺方案有效的降低了产品翘曲变形值,提高了产品质量,表明了响应面法在鼠标面盖成型工艺优化应用中的可行性和有效性。

关键词：注塑成型翘曲变形响应面法中心复合设计工艺优化 Design—Expert