期刊文献+
共找到8篇文章
< 1 >
每页显示 20 50 100
Instability Analysis of Strike-Slip Fault Based on Cusp Catastrophe Model
1
作者 Zaitie Chen WeiWang Dayang Li 《Structural Durability & Health Monitoring》 EI 2018年第1期19-33,共15页
The distribution of many active faults in western China is an important reasonfor the frequent earthquakes. With the rapid development of the western region, manymajor projects have been built there and the existence ... The distribution of many active faults in western China is an important reasonfor the frequent earthquakes. With the rapid development of the western region, manymajor projects have been built there and the existence of active faults is bound to have aninfluence on the safety of the engineering structure. Therefore, it is of great significanceto study the mechanism of fault slip instability for evaluating the geological stability ofthe region and for the site selection of major projects. In this paper, cusp catastrophetheory is used to establish a cusp catastrophe model with general softened form ofstrike-slip faults on the basis of strike-slip faults. In this model, the influence of thesoftening property of fault zone on fault instability is considered. Based on this model,the conditions of slip instability of strike-slip faults are derived and further the half-slipdistance, far-field displacement and energy release equation of sliding-slip fault arerevealed. The influences of the system stiffness ratio and the softening property of thefault zone on the half-wave displacement, the far-field displacement and the energyrelease are shown. Which lays a good foundation for further research on activefault-induced earthquake mechanism. 展开更多
关键词 cusp catastrophe model strike-slip fault semi-dislocation far field displacement
下载PDF
Protection motivation theory and cigarette smoking among vocational high school students in China:a cusp catastrophe modeling analysis
2
作者 Yunan Xu Xinguang Chen 《Global Health Research and Policy》 2016年第1期18-26,共9页
Background:Tobacco use is one of the greatest public health problems worldwide and the hazards of cigarette smoking to public health call for better recognition of cigarette smoking behaviors to guide evidence-based p... Background:Tobacco use is one of the greatest public health problems worldwide and the hazards of cigarette smoking to public health call for better recognition of cigarette smoking behaviors to guide evidence-based policy.Protection motivation theory(PMT)provides a conceptual framework to investigate tobacco use.Evidence from diverse sources implies that the dynamics of smoking behavior may be quantum in nature,consisting of an intuition and an analytical process,challenging the traditional linear continuous analytical approach.In this study,we used cusp catastrophe,a nonlinear analytical approach to test the dual-process hypothesis of cigarette smoking.Methods:Data were collected from a random sample of vocational high school students in China(n=528).The multivariate stochastic cusp modeling was used and executed with the Cusp Package in R.The PMT-based Threat Appraisal and Coping Appraisal were used as the two control variables and the frequency of cigarette smoking(daily,weekly,occasional,and never)in the past month was used as the outcome variable.Results:Consistent with PMT,the Threat Appraisal(asymmetry,α1=0.1987,p<0.001)and Coping Appraisal(bifurcation,β2=0.1760,p<0.05)significantly predicted the smoking behavior after controlling for covariates.Furthermore,the cusp model performed better than the alternative linear and logistic regression models with regard to higher R2(0.82 for cusp,but 0.21 for linear and 0.25 for logistic)and smaller AIC and BIC.Conclusion:Study findings support the conclusion that cigarette smoking in adolescents is a quantum process and PMT is relevant to guide studies to understand smoking behavior for smoking prevention and cessation. 展开更多
关键词 Quantum change cusp catastrophe modeling Cigarette smoking Adolescents
下载PDF
Stability analysis of the pillars between bedded salt cavern gas storages by cusp catastrophe model 被引量:2
3
作者 WANG TongTao YAN XmangZhen +1 位作者 YANG HengLin YANG XiuJuan 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第6期1615-1623,共9页
The failure of pillars between bedded salt cavern gas storages can be seen as processes that the deformations of pillars convert from continuous gradual change system to catastrophe state,which are typical nonlinear c... The failure of pillars between bedded salt cavern gas storages can be seen as processes that the deformations of pillars convert from continuous gradual change system to catastrophe state,which are typical nonlinear catastrophe problems.In the paper,the cusp catastrophe model is proposed to obtain the stability factors of pillars.It can overcome the shortages of traditional strength reduction finite element method(SR FEM) and greatly improve the accuracy of stability factors obtained by numerical simulations.The influences of cavern depth,gas pressure,pillar width,and time on the stability factors are studied.Y-1 and Y-2 salt cavern gas storages,located at Jiangsu province of China,were simulated as examples.The stability factors of pillars between Y-1 and Y-2 were evaluated,and the running parameters were recommended to ensure the pillars stability.The results showed that the cusp catastrophe model has high practicability and can precisely predict the stability factors.The stability factors are equidirectional with the increase of gas pressure and pillar width,but reverse to the increase of cavern depth and time.The stability factors of pillars between Y-1 and Y-2 are small for narrow widths,which are influenced greatly by gas pressure,time,pressure difference,and gas production rate.In order to ensure the safety of pillars,the lowest gas pressure,safe running time,max.pressure difference and max.gas production rate of Y-1 and Y-2 were recommended as 7 MPa,5 years,3 MPa,and 0.50 MPa/d,respectively. 展开更多
关键词 salt cavern gas storages pillar stability cusp catastrophe model stability factor numerical simulation
原文传递
Research on traffic flow forecasting model based on cusp catastrophe theory 被引量:2
4
作者 张亚平 裴玉龙 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2004年第1期1-5,共5页
This paper intends to describe the relationship between traffic parameters by using cusp catastrophe theory and to deduce highway capacity and corresponding speed forecasting value through suitable transformation of c... This paper intends to describe the relationship between traffic parameters by using cusp catastrophe theory and to deduce highway capacity and corresponding speed forecasting value through suitable transformation of catastrophe model. The five properties of a catastrophe system are outlined briefly, and then the data collected on freeways of Zhujiang River Delta, Guangdong province, China are examined to ascertain whether they exhibit qualitative properties and attributes of the catastrophe model. The forecasting value of speed and capacity for freeway segments are given based on the catastrophe model. Furthermore, speed-flow curve on freeway is drawn by plotting out congested and uncongested traffic flow and the capacity value for the same freeway segment is also obtained from speed-flow curve to test the feasibility of the application of cusp catastrophe theory in traffic flow analysis. The calculating results of catastrophe model coincide with those of traditional traffic flow models regressed from field observed data, which indicates that the deficiency of traditional analysis of relationship between speed, flow and occupancy in two-dimension can be compensated by analysis of the relationship among speed, flow and occupancy based on catastrophe model in three-dimension. Finally, the prospects and problems of its application in traffic flow research in China are discussed. 展开更多
关键词 capacity cusp catastrophe model speed-flow curve traffic flow forecasting
下载PDF
The Study of Chamber Rockburst by the CUSP Model of Catastrophe Theory 被引量:4
5
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
DESCRIPTION AND PREDICTION OF CATASTROPHE OF VIBRATION STATE FOR FAULTY ROTORS 被引量:5
6
作者 Chen Anhua Zhong Jue 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 1996年第1期130-134,共5页
A sudden increase of vibration amplitude with no foreboding often results in an abrupt breakdown of a mechanical system.The catastrophe of vibration state of a faulty rotor is a typical nonlinear phenomenon,and very d... A sudden increase of vibration amplitude with no foreboding often results in an abrupt breakdown of a mechanical system.The catastrophe of vibration state of a faulty rotor is a typical nonlinear phenomenon,and very difficult to be described and predicted with linear vibration theory.On the basis of nonlinear vibration and catastrophe theory,fhe eatastrophe of the vibration amplitude of the faulty rotor is described;a way to predict its emergence is developed. 展开更多
关键词 mechanical fault diagnosis and prediction cusp catastrophe model nonlinear vibration rotor
下载PDF
Fundamental and speculative components of the cryptocurrency pricing dynamics 被引量:1
7
作者 Jiri Kukacka Ladislav Kristoufek 《Financial Innovation》 2023年第1期1694-1716,共23页
The driving forces behind cryptoassets’price dynamics are often perceived as being dominated by speculative factors and inherent bubble-bust episodes.Fundamental components are believed to have a weak,if any,role in ... The driving forces behind cryptoassets’price dynamics are often perceived as being dominated by speculative factors and inherent bubble-bust episodes.Fundamental components are believed to have a weak,if any,role in the price-formation process.This study examines five cryptoassets with different backgrounds,namely Bitcoin,Ethereum,Litecoin,XRP,and Dogecoin between 2016 and 2022.It utilizes the cusp catastrophe model to connect the fundamental and speculative drivers with possible price bifurcation characteristics of market collapse events.The findings show that the price and return dynamics of all the studied assets,except for Dogecoin,emerge from complex interactions between fundamental and speculative components,includ-ing episodes of price bifurcations.Bitcoin shows the strongest fundamentals,with on-chain activity and economic factors driving the fundamental part of the dynam-ics.Investor attention and off-chain activity drive the speculative component for all studied assets.Among the fundamental drivers,the analyzed cryptoassets present their coin-specific factors,which can be tracked to their protocol specifics and are economi-cally sound. 展开更多
关键词 Cryptocurrency Bitcoin cusp catastrophe model CRASH
下载PDF
Regularization of mathematical model for chip flow angle catastrophe
8
作者 Shao-Nan Zhang Dong-Dong Cheng Liang-Shan Xiong 《Advances in Manufacturing》 SCIE EI CAS CSCD 2021年第4期568-579,共12页
The chip flow angle(CFA)catastrophe in double-edged cutting results in a significant reduction in the cutting force,which can benefit the applications.However,established potential functions(i.e.,cutting power calcula... The chip flow angle(CFA)catastrophe in double-edged cutting results in a significant reduction in the cutting force,which can benefit the applications.However,established potential functions(i.e.,cutting power calculation functions)of mathematical models for the CFA catastrophe are presented in the form of transcendental functions with two control parameters and one state parameter,which are extremely complex.A method is proposed herein to realize the regularization of the potential functions and establish mathematical models in a standard form and with complete content for the CFA catastrophe.Using this method,the potential function of the CFA catastrophe is expanded into a k-order Taylor polynomial at each midpoint of N end-to-end equally partitioned intervals of the state parameter using the Taylor function provided in MATLAB.The potential function after piecewise Taylor expansion is transformed into the same form as the potential function of the standard cusp catastrophe model by truncating the first five terms of the Taylor polynomial and eliminating the third-order term of the state parameter with elementary transformation.Hence,the regularization of potential function is realized.Subsequently,the regularization of equilibrium surface and bifurcation set can be realized based on the conclusions of the catastrophe theory.Regularization errors of the potential function,equilibrium surface,and bifurcation set are defined to evaluate the effectiveness of this regularization method.The problem of calculating regularization errors is regarded as an optimization problem.The‘‘simulannealbnd’’function provided in MATLAB is used to solve the problem.Applying the proposed method,the regularization of a mathematical model for the CFA catastrophe established by the predecessor is completed;a mathematical model(i.e.,standard cusp catastrophe model)in a standard form and with complete content for the CFA catastrophe is established;and the corresponding regularization errors are analyzed.The regularization errors of the potential function,equilibrium surface,and bifurcation set curves are 5.4855910-4%,0.3206%,and 4.6539%,respectively.Based on the equilibrium surface and the bifurcation set curves constructed using the regularized mathematical model for the CFA catastrophe,the mechanism of the CFA catastrophe and the specific approach to render the cutting system operable in a low-energy consumption state by controlling the historical change path of the control point are analyzed.This study will promote the rational use of the CFA catastrophe. 展开更多
关键词 Chip flow angle(CFA)catastrophe Mathematical model REGULARIZATION Potential function catastrophe theory cusp catastrophe model
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部