The Courant-Friedrichs-Lewy condition(The CFL condition)is appeared in the analysis of the finite difference method applied to linear hyperbolic partial differential equations.We give a remark on the CFL condition fro...The Courant-Friedrichs-Lewy condition(The CFL condition)is appeared in the analysis of the finite difference method applied to linear hyperbolic partial differential equations.We give a remark on the CFL condition from a view point of stability,and we give some numerical experiments which show instability of numerical solutions even under the CFL condition.We give a mathematical model for rounding errors in order to explain the instability。展开更多
The ocean transportation of grain bulk carriers is promoted by development of ocean economic.With the development of coastal region,the cargo transportation wi11 become more and more important,especially for the resou...The ocean transportation of grain bulk carriers is promoted by development of ocean economic.With the development of coastal region,the cargo transportation wi11 become more and more important,especially for the resource such as grain,oil and coal.In this study,a model is built to estimate the number of grain bulk carriers needed for wheat based upon analyzing the relationships between Tons and Ton-miles of Africa wheat transportation.We find that the agricultural policies greatly affect the wheat transportation to Africa.Then,using two scenarios, we predict how many ships are necessary for the maritime transportation of wheat from other places to Africa in the future.We believe that this research is extremely useful to maritime transportation of wheat to Africa.展开更多
基金Grant-in-Aid for Scientific Research(B)22340018 from Japan Society for the Promotion of Science.
文摘The Courant-Friedrichs-Lewy condition(The CFL condition)is appeared in the analysis of the finite difference method applied to linear hyperbolic partial differential equations.We give a remark on the CFL condition from a view point of stability,and we give some numerical experiments which show instability of numerical solutions even under the CFL condition.We give a mathematical model for rounding errors in order to explain the instability。
文摘The ocean transportation of grain bulk carriers is promoted by development of ocean economic.With the development of coastal region,the cargo transportation wi11 become more and more important,especially for the resource such as grain,oil and coal.In this study,a model is built to estimate the number of grain bulk carriers needed for wheat based upon analyzing the relationships between Tons and Ton-miles of Africa wheat transportation.We find that the agricultural policies greatly affect the wheat transportation to Africa.Then,using two scenarios, we predict how many ships are necessary for the maritime transportation of wheat from other places to Africa in the future.We believe that this research is extremely useful to maritime transportation of wheat to Africa.
