Sportsmen who engage in sports in open natural settings are not always coherent in their behaviors towards environment; in fact, they seldom are. From survey made on a sport event the "Grand Raid 2010", a foot race ...Sportsmen who engage in sports in open natural settings are not always coherent in their behaviors towards environment; in fact, they seldom are. From survey made on a sport event the "Grand Raid 2010", a foot race in mountains of Reunion Island, the authors discover that these sportsmen are not the good activists fighting for a green planet that they imagine they are. The authors try to explain the disparity between the perception that they have of themselves and the reality of their practices.展开更多
In this paper, a concept of 'identical problems' of natural convection in enclosures is presented. A pair of problems of natural convection in enclosures is said to be identical if they look different in appea...In this paper, a concept of 'identical problems' of natural convection in enclosures is presented. A pair of problems of natural convection in enclosures is said to be identical if they look different in appearance but with appropriate selection of coordinates and appropriate definition of dimensionless variables for each problem, they will have identical geometric configurations and identical dimensionless governing equations and related boundary conditions. The identical characteristics of a pair of problems of natural convection in enclosures with an internal isolated island are demonstrated via dimensionless mathematical formulation and flow visualization results. Numerical computations are performed and the predicted streamlines agree with the flow visualization results. A number of other possible pairs of identical problems are also presented. Applications of the identical character are provided and assumptions under which the identical problems may exist are discussed.展开更多
文摘Sportsmen who engage in sports in open natural settings are not always coherent in their behaviors towards environment; in fact, they seldom are. From survey made on a sport event the "Grand Raid 2010", a foot race in mountains of Reunion Island, the authors discover that these sportsmen are not the good activists fighting for a green planet that they imagine they are. The authors try to explain the disparity between the perception that they have of themselves and the reality of their practices.
文摘In this paper, a concept of 'identical problems' of natural convection in enclosures is presented. A pair of problems of natural convection in enclosures is said to be identical if they look different in appearance but with appropriate selection of coordinates and appropriate definition of dimensionless variables for each problem, they will have identical geometric configurations and identical dimensionless governing equations and related boundary conditions. The identical characteristics of a pair of problems of natural convection in enclosures with an internal isolated island are demonstrated via dimensionless mathematical formulation and flow visualization results. Numerical computations are performed and the predicted streamlines agree with the flow visualization results. A number of other possible pairs of identical problems are also presented. Applications of the identical character are provided and assumptions under which the identical problems may exist are discussed.