期刊文献+
共找到3篇文章
< 1 >
每页显示 20 50 100
Development of a wheat aphid population dynamics model based on cusp catastrophe theory
1
作者 Yuan Li Zhen Li +2 位作者 Lichun Zhao Zuqing Hu Huiyan Zhao 《International Journal of Biomathematics》 SCIE 2020年第8期113-131,共19页
Aphids are a major global wheat,pest that can cause considerable loss of yield.Modeling of aphid population dynamics is an integral part of management strategies to manage or control aphid populations.In this paper,fi... Aphids are a major global wheat,pest that can cause considerable loss of yield.Modeling of aphid population dynamics is an integral part of management strategies to manage or control aphid populations.In this paper,first,a wheat aphid population dynamics model was developed based on a logistic model and theⅠlollingⅢfunctional response,which includes three factors:temperature,natural enemies and insecticide.Second,this model fitted with a cusp catastrophe model to describe how abrupt changes in the wheat aphid population were influenced by these factors,Finally,the system was validated with field data from 2016 to 2018.The bifurcation set of the cusp catastrophe model was deemod to be the quantified dynamic control threshold,so an outbreak of aphid's population can be explained according to the variation of control variables.In short,this aphid population model was successfully validated on survey data,which can be used to guide the prevention and control of aphids. 展开更多
关键词 APHIDS population dynamics model cusp catastrophe theory functional response
原文传递
The Study of Chamber Rockburst by the CUSP Model of Catastrophe Theory 被引量:4
2
作者 潘一山 章梦涛 李国臻 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1994年第10期943-951,共9页
By means of CUSP model of catastrophe theory. this paper has studied thephysics process of rockburst occured on circular chamber. The present paper has nolonly described the instability process of rockburst more deepl... By means of CUSP model of catastrophe theory. this paper has studied thephysics process of rockburst occured on circular chamber. The present paper has nolonly described the instability process of rockburst more deeply. but also got the crilicaldepth of plastic softening area of chamber that is valuable in the controlling engineering of rockburst. the chamber displacement jump and energy liberation have been derived. the influence of rock parameters on the rockburst has been discussed . 展开更多
关键词 rockburst. cusp model of catastrophe theory. critical depth ofplastic softening area. displacement jump. energy liberation
下载PDF
Stability of interbed for salt cavern gas storage in solution mining considering cusp displacement catastrophe theory 被引量:9
3
作者 Le Yu Jianjun Liu 《Petroleum》 2015年第1期82-90,共9页
Cusp displacement catastrophe theory can be introduced to propose a new method about instability failure of the interbed for gas storage cavern in bedded salt in solution mining.We can calculate initial fracture drawi... Cusp displacement catastrophe theory can be introduced to propose a new method about instability failure of the interbed for gas storage cavern in bedded salt in solution mining.We can calculate initial fracture drawing pace of this interbed to obtain 2D and 3D gas storage shapes at this time.Moreover,Stability evaluation of strength reduction finite element method(FEM)based on this catastrophe theory can used to evaluate this interbed stability after initial fracture.A specific example is simulated to obtain the influence of the interbed depth,cavern internal pressure,and cavern building time on stability safety factor(SSF).The results indicate:the value of SSF will be lower with the increase of cavern building time in solution mining and the increase of interbed depth and also this value remains a rise with the increase of cavern internal pressure Especially,we can conclude that the second-fracture of the interbed may take place when this pressure is lower than 6 MPa or after 6 days later of the interbed after initial fracture.According to above analysis,some effective measures,namely elevating the tube up to the top of the interbed,or changing the circulation of in-and-out lines,can be introduced to avoid the negative effects when the secondfracture of the interbed may occur. 展开更多
关键词 cusp displacement catastrophe theory The interbed Gas storage cavern Initial fracture drawing pace Stability evaluation Safety factor
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部