1930s was the golden age for the flying-boat airlines in the world, notably the Pan Am Clipper transpacific and transatlantic routes, and the （British） Imperial Airways UK-Africa and UK-Australia/Far East routes. Th...1930s was the golden age for the flying-boat airlines in the world, notably the Pan Am Clipper transpacific and transatlantic routes, and the （British） Imperial Airways UK-Africa and UK-Australia/Far East routes. The major advantage of the flying boats was its endless runway （i.e., ocean or lake） and resultant possibilities for larger aircrafts than land-based airliners. Airlines such as Pan Am made large investments in the 1930s for flying boats, their special terminals by the water, and the worldwide flying-boat air route network. However, in the late 1940s to early 1950s, the flying boats suddenly disappeared due to the rapid development of land-based large airliners and long runways, according to the previous studies. The author conducted historical research on this topic, and found another reason： rapid decline in the high-income population who used to travel by flying boat scheduled flights. Also found was a recent surge of the luxury market, and steady increase in the cruise-ship passengers. Hence, there could be implications for revival of the flying boat flights as luxury cruise, rather than as scheduled flights.展开更多
With the majority of young people increasingly becoming the main force of the use of the network, the network as a new kind of social factors on the growth of young people is increasingly prominent. Network not only h...With the majority of young people increasingly becoming the main force of the use of the network, the network as a new kind of social factors on the growth of young people is increasingly prominent. Network not only help young people broaden their horizons, accept avant-garde concept, concern about the world cutting-edge issues, but also spread some violence, pornographic or reactionary spare, as well as network addiction problem which will cause a serious negative impact on the healthy growth of young people and lead to increasing juvenile crime. The number of juvenile criminals has increased every year in China and has trended to lowering ages, regiment turn and malignant development, which will cause great harm to social stability. Of course, there are many causes of juvenile delinquency, but showing characteristics are also diverse.展开更多
The effects of noise and a periodic signal on a synthetic gene network have been investigated. By tuning the distance of a parameter from the Hopf bifurcation point, both implicit internal signal stochastic resonance ...The effects of noise and a periodic signal on a synthetic gene network have been investigated. By tuning the distance of a parameter from the Hopf bifurcation point, both implicit internal signal stochastic resonance and explicit internal signal stochastic resonance can be induced by noise. Furthermore, a switch process can also be elicited. When a periodic signal is coupled to the gene network, two interesting phenomena occur with the modulation of the frequency of the signal: the effect of noise amplifying cellular signal can be inhibited or even destroyed, and "locked" coherence resonance occurs.展开更多
文摘1930s was the golden age for the flying-boat airlines in the world, notably the Pan Am Clipper transpacific and transatlantic routes, and the （British） Imperial Airways UK-Africa and UK-Australia/Far East routes. The major advantage of the flying boats was its endless runway （i.e., ocean or lake） and resultant possibilities for larger aircrafts than land-based airliners. Airlines such as Pan Am made large investments in the 1930s for flying boats, their special terminals by the water, and the worldwide flying-boat air route network. However, in the late 1940s to early 1950s, the flying boats suddenly disappeared due to the rapid development of land-based large airliners and long runways, according to the previous studies. The author conducted historical research on this topic, and found another reason： rapid decline in the high-income population who used to travel by flying boat scheduled flights. Also found was a recent surge of the luxury market, and steady increase in the cruise-ship passengers. Hence, there could be implications for revival of the flying boat flights as luxury cruise, rather than as scheduled flights.
文摘With the majority of young people increasingly becoming the main force of the use of the network, the network as a new kind of social factors on the growth of young people is increasingly prominent. Network not only help young people broaden their horizons, accept avant-garde concept, concern about the world cutting-edge issues, but also spread some violence, pornographic or reactionary spare, as well as network addiction problem which will cause a serious negative impact on the healthy growth of young people and lead to increasing juvenile crime. The number of juvenile criminals has increased every year in China and has trended to lowering ages, regiment turn and malignant development, which will cause great harm to social stability. Of course, there are many causes of juvenile delinquency, but showing characteristics are also diverse.
基金supported by the National Natural Science Foundation of China (20905009 and 21003010)the Logistics Management & Engineering Platform of Beijing Area Logistics System & Technology Major Laboratory, and Excellent Young Scholars Research Fund of Beijing Institute of Technology (2009 Y1017)
文摘The effects of noise and a periodic signal on a synthetic gene network have been investigated. By tuning the distance of a parameter from the Hopf bifurcation point, both implicit internal signal stochastic resonance and explicit internal signal stochastic resonance can be induced by noise. Furthermore, a switch process can also be elicited. When a periodic signal is coupled to the gene network, two interesting phenomena occur with the modulation of the frequency of the signal: the effect of noise amplifying cellular signal can be inhibited or even destroyed, and "locked" coherence resonance occurs.
