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Impact failure models and application condition of trees in debris-flow hazard mitigation 被引量:1
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作者 JIN Ke CHEN Jian-gang +3 位作者 CHEN Xiao-qing ZHAO Wan-yu SI Guang-wu GONG Xing-long 《Journal of Mountain Science》 SCIE CSCD 2021年第7期1874-1885,共12页
Forestry has played an important role in hazard mitigation associated with debris flows.Most forest mitigation measures refer to the experience of soil and water conservation,which disregard the destructive effect of ... Forestry has played an important role in hazard mitigation associated with debris flows.Most forest mitigation measures refer to the experience of soil and water conservation,which disregard the destructive effect of debris flows,causing potentially serious consequences.Determination of the effect of a forest on reducing debris-flow velocity and even stopping debris flows requires distinguishing between when the debris flow will destroy the forest and when the trees will withstand the debris-flow impact force.In this paper,we summarized two impact failure models of a single tree: stem breakage and overturning.The influences of different tree sizes characteristics(stem base diameter,tree weight,and root failure radius) and debris-flow characteristics(density,velocity,flow depth,and boulder diameter) on tree failure were analyzed.The observations obtained from the model adopted in this study show that trees are more prone to stem breakage than overturning.With an increase in tree size,the ability to resist stem breakage and overturning increases.Debris-flow density influences the critical failure conditions of trees substantially less than the debrisflow velocity,depth,and boulder diameter.The application conditions of forests in debris-flow hazard mitigation were proposed based on the analysis of the model results.The proposed models were applied in the Xiajijiehaizi Gully as a case study,and the results explain the destruction of trees in the forest dispersing zone.This work provides references for implementing forest measures for debris-flow hazard mitigation. 展开更多
关键词 Trees Impact failure model Forest application condition Debris flow mitigation
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Some Generalizations of Monotonicity Condition and Applications 被引量:2
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作者 虞旦盛 周颂平 《数学进展》 CSCD 北大核心 2006年第6期755-757,共3页
0 Introduction It is well known that there axe a great number of interesting results in Fourier analysis established by assuming monotonicity of coefficients, and many of them have been generalized by loosing the cond... 0 Introduction It is well known that there axe a great number of interesting results in Fourier analysis established by assuming monotonicity of coefficients, and many of them have been generalized by loosing the condition to quasi-monotonicity, O-regularly varying quasi-monotonicity, etc.. 展开更多
关键词 LIM Some Generalizations of Monotonicity Condition and applications
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Transformation Behaviour of Austenite in Steel under Condition of Stress-strain and Its Application
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作者 Xu WANG Sigen WANG and Lixian HUA (Dept. of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China) 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1995年第6期440-442,共3页
Austenite can be retained at ambient temperature in steels by alloying and processing control. The transformation from austenite to martensite occurs under a certain conditions : thermal or deformation. Stress-strain ... Austenite can be retained at ambient temperature in steels by alloying and processing control. The transformation from austenite to martensite occurs under a certain conditions : thermal or deformation. Stress-strain induced martensitic transformation is important to improve the plasticity of steels which is called transformation induced plasticity (TRIP). Strength-ductility balance of the steels is greatly superior to that of other high strength steels due to the TRIP effect. A new type of steels-TRIP steel is developed 展开更多
关键词 TRIP Transformation Behaviour of Austenite in Steel under Condition of Stress-strain and Its application
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An application of radiation boundary condition to scattering problem of acoustic waves in fluids
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作者 JIANG Jiaxiang(University of Science and Technology of China, Hefei 230026) 《Chinese Journal of Acoustics》 1991年第3期237-243,共7页
A numerical method of solving acoustic wave scattering pnblem in fluids is described. Radiation boundary condition (RBC) obtained by factorization method of Helmholtz equation is applied to transforming the exterior b... A numerical method of solving acoustic wave scattering pnblem in fluids is described. Radiation boundary condition (RBC) obtained by factorization method of Helmholtz equation is applied to transforming the exterior boundary value problem in unbounded region into one in a finite region. Combined with RBC and scatterer surface boundary condition, Helmholtz equation is solved numerically by the finite difference method. Computational results for sphere and prolate spheroidal scatterers are in excellent agreement with eigenfunction solutions and much better than the results of OSRC method. 展开更多
关键词 An application of radiation boundary condition to scattering problem of acoustic waves in fluids
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