We consider a very general interacting branching process which includes most of the important interacting branching models considered so far. After obtaining some key preliminary results, we first obtain some elegant ...We consider a very general interacting branching process which includes most of the important interacting branching models considered so far. After obtaining some key preliminary results, we first obtain some elegant conditions regarding regularity and uniqueness, Then the extinction vector is obtained which is very easy to be calculated. The mean extinction time and the conditional mean extinction time are revealed.The mean explosion time and the total mean life time of th, processes are also investigated and resolved.展开更多
Since the 1990s, the generation gap among three important groups of writers born in the 1950s, 1960s and 1970s has become ever more evident. Not only do they show a tendency toward the weakening of grand narrative and...Since the 1990s, the generation gap among three important groups of writers born in the 1950s, 1960s and 1970s has become ever more evident. Not only do they show a tendency toward the weakening of grand narrative and sense of responsibility and the strengthening of individual aspirations, they also show different aesthetic traits in terms of narrative form. Some advocate a realist style, while others pursue modernist techniques or are enamored of fragmentary details. At the same time, each generation projects its own aesthetic ideas. From the viewpoint of cultural anthropology, this kind Of generation gap essentially implies the effect of the latent protocols of different historical-cultural contexts and memories of growing up on the human spirit. Although the generation gap is an expression of a plural cultural scene, the question of how to strengthen intellectual interaction between different generations of writers and effectively overcome the limitations of each generation remains an important aspect of the promotion of the healthy development of modern Chinese literature.展开更多
Experimental and numerical studies were carried out to evaluate the effect of vortex generator on a small cylindrical protrusion at Mach number 2.0. The experiments were performed using the supersonic blow down wind t...Experimental and numerical studies were carried out to evaluate the effect of vortex generator on a small cylindrical protrusion at Mach number 2.0. The experiments were performed using the supersonic blow down wind tunnel on different heights of cylindrical protrusion with vortex generator placed ahead of them. The upstream and downstream flow around the cylindrical protrusion is influenced by vortex generator as is observed using both visualization and pressure measurement techniques. Numerical studies using three dimensional steady implicit formulations with standard k-ω turbulence model was performed. Results obtained through the present computation are compared with the experimental results at Mach 2.0. Good agreements between computation and experimental results have been achieved. The results indicate that the aerodynamic drag acting on cylindrical protrusion can be reduced by adopting vortex generator.展开更多
基金supported by National Natural Science Foundation of China (Grant Nos 11371374 and 11571372)Research Fund for the Doctoral Program of Higher Education of China (Grant No 20110162110060)
文摘We consider a very general interacting branching process which includes most of the important interacting branching models considered so far. After obtaining some key preliminary results, we first obtain some elegant conditions regarding regularity and uniqueness, Then the extinction vector is obtained which is very easy to be calculated. The mean extinction time and the conditional mean extinction time are revealed.The mean explosion time and the total mean life time of th, processes are also investigated and resolved.
文摘Since the 1990s, the generation gap among three important groups of writers born in the 1950s, 1960s and 1970s has become ever more evident. Not only do they show a tendency toward the weakening of grand narrative and sense of responsibility and the strengthening of individual aspirations, they also show different aesthetic traits in terms of narrative form. Some advocate a realist style, while others pursue modernist techniques or are enamored of fragmentary details. At the same time, each generation projects its own aesthetic ideas. From the viewpoint of cultural anthropology, this kind Of generation gap essentially implies the effect of the latent protocols of different historical-cultural contexts and memories of growing up on the human spirit. Although the generation gap is an expression of a plural cultural scene, the question of how to strengthen intellectual interaction between different generations of writers and effectively overcome the limitations of each generation remains an important aspect of the promotion of the healthy development of modern Chinese literature.
基金supported by Advanced Research Center Program(NRF-2013R1A5A1073861) through the National Research Foundation of Korea(NRF) grant funded by the Korea government(MSIP) contracted through Advanced Space Propulsion Research Center at Seoul National University.(Project Number: 0659-20140012)
文摘Experimental and numerical studies were carried out to evaluate the effect of vortex generator on a small cylindrical protrusion at Mach number 2.0. The experiments were performed using the supersonic blow down wind tunnel on different heights of cylindrical protrusion with vortex generator placed ahead of them. The upstream and downstream flow around the cylindrical protrusion is influenced by vortex generator as is observed using both visualization and pressure measurement techniques. Numerical studies using three dimensional steady implicit formulations with standard k-ω turbulence model was performed. Results obtained through the present computation are compared with the experimental results at Mach 2.0. Good agreements between computation and experimental results have been achieved. The results indicate that the aerodynamic drag acting on cylindrical protrusion can be reduced by adopting vortex generator.
