The study on multi-faCtor Sensibility analysis problem in project evaluation, [1]-I4] gave the static models respectively. In order to raise the practicality and reliability of sensibility analysis,we propoes a dyna...The study on multi-faCtor Sensibility analysis problem in project evaluation, [1]-I4] gave the static models respectively. In order to raise the practicality and reliability of sensibility analysis,we propoes a dynamic model in this paper. Comparing with the above, our model has four special features. First, it is suitable for us to optimize and control the Proceeding Project and evaluate the completed Project as well. Second, it offers quantitative measures of sensitivity formulas. Third,it can evaluate project dynamically so that it can obtain much higher precision and reliability . Fourth,it can deal with Problem which involved in cost of capital fluctuation.展开更多
This study deals with the turbulent structure in the surface layer over the Qinghai-Xizang Plateau.Using gradient transfer and heat balance methods we have determined the nondimensional coefficient 1/(?)_m(?)h in the ...This study deals with the turbulent structure in the surface layer over the Qinghai-Xizang Plateau.Using gradient transfer and heat balance methods we have determined the nondimensional coefficient 1/(?)_m(?)h in the expression of turbulent transfer coefficient for sensible heat (K_h).It is found that the results are in good agreement with the 1/(?)_m(?)_h obtained by Pruitt,et al.The K_h at a height of 1m under cloudy and cloudless conditions is calculated.Finally,the ratio of K_h to momentum turbulent coefficient over the plateau is compared with those over plains.展开更多
In this paper,we study general recovery functions and treatment in the dynamics of an SIS model for sexually transmitted infections with nonzero partnership length.It is shown how partnership dynamics influences the p...In this paper,we study general recovery functions and treatment in the dynamics of an SIS model for sexually transmitted infections with nonzero partnership length.It is shown how partnership dynamics influences the predicted prevalence at the steady state and the basic reproduction number.Sobol's indices are used to evaluate the contribution of model parameters to the overall variance of R 0.The recovery functions studied here take into account that society's capacity to provide treatment is limited when the number of infected individuals is large.Bifurcation analysis is used to establish a relationship between an alert level of prevalence and the minimum recovery time that guarantees the eradication of the disease.We also show that a backward bifurcation can occur when there are delays in the treatment of infected individuals.展开更多
文摘The study on multi-faCtor Sensibility analysis problem in project evaluation, [1]-I4] gave the static models respectively. In order to raise the practicality and reliability of sensibility analysis,we propoes a dynamic model in this paper. Comparing with the above, our model has four special features. First, it is suitable for us to optimize and control the Proceeding Project and evaluate the completed Project as well. Second, it offers quantitative measures of sensitivity formulas. Third,it can evaluate project dynamically so that it can obtain much higher precision and reliability . Fourth,it can deal with Problem which involved in cost of capital fluctuation.
文摘This study deals with the turbulent structure in the surface layer over the Qinghai-Xizang Plateau.Using gradient transfer and heat balance methods we have determined the nondimensional coefficient 1/(?)_m(?)h in the expression of turbulent transfer coefficient for sensible heat (K_h).It is found that the results are in good agreement with the 1/(?)_m(?)_h obtained by Pruitt,et al.The K_h at a height of 1m under cloudy and cloudless conditions is calculated.Finally,the ratio of K_h to momentum turbulent coefficient over the plateau is compared with those over plains.
基金FS thanks Consejo Nacional de Ciencia y Tecnología(CONACyT)for the Graduate Fellowship Grant 331194.
文摘In this paper,we study general recovery functions and treatment in the dynamics of an SIS model for sexually transmitted infections with nonzero partnership length.It is shown how partnership dynamics influences the predicted prevalence at the steady state and the basic reproduction number.Sobol's indices are used to evaluate the contribution of model parameters to the overall variance of R 0.The recovery functions studied here take into account that society's capacity to provide treatment is limited when the number of infected individuals is large.Bifurcation analysis is used to establish a relationship between an alert level of prevalence and the minimum recovery time that guarantees the eradication of the disease.We also show that a backward bifurcation can occur when there are delays in the treatment of infected individuals.
