In the past several years, from May 12, 2008 Wenchuan Mw8.0 earthquake in China to March 11, 2011 off the Pacific coast of Northeastern Mw9.0 earthquake in Japan, the world witnessed catastrophic disasters caused by d...In the past several years, from May 12, 2008 Wenchuan Mw8.0 earthquake in China to March 11, 2011 off the Pacific coast of Northeastern Mw9.0 earthquake in Japan, the world witnessed catastrophic disasters caused by destructive earthquakes. The earthquake posed a great threat to the development of society and economy, especially in the developing countries such as China. In order to reduce the losses in peoples life and properties in maximum possibilities, there were a lots of technologies had been researched and developed, among them the earthquake early warning system （EEWS） and rapid seismic instrumental intensity report （RSIIP） are the two of the state-of-the-art technologies for the purpose. They may be used to minimize property damage and loss of life and to aid emergency response after a destructive earthquake.展开更多
Purpose To compare and assess differences in the career performance progressions of elite junior and Olympic track and field athletes.Methods Annual best performances from top 8 men and women(e.g.finalists)in track an...Purpose To compare and assess differences in the career performance progressions of elite junior and Olympic track and field athletes.Methods Annual best performances from top 8 men and women(e.g.finalists)in track and field events at the 2000 World Junior Championships(junior cohort)and the 2000 Olympic Games(Olympic cohort)were examined.Annual bests of these finalists were tracked each year from select groups:sprints(100 m,200 m),distance(1500 m,5000 m),jumps(long jump,high jump),throws(discus,shot put).Age of best lifetime performance,age of final posted performance,and improvement from junior-age best to lifetime best performance were compared between groups.Results Olympic finalists achieved lifetime best performances at later ages than junior finalists[26.0±4.0 years vs.21.1±3.5 years;age difference 90%CI(3.7-5.2 years),P<0.001],and this significant age difference between cohorts was found within all four groups.Olympic finalists improved from under-20 best to lifetime best more so than junior finalists[6.1±4.8%vs.2.5±2.3%;Age difference 90%CI(2.5-4.8%),P<0.001].Of 130 junior finalists,54 did not improve after age 19,while 19 of 128 Olympic finalists posted no improvement after age 19.Conclusion The data suggest that these two populations have different career performance progressions and challenge the notion that achieving elite success as a junior athlete is a prerequisite for the same success at the senior level.展开更多
文摘In the past several years, from May 12, 2008 Wenchuan Mw8.0 earthquake in China to March 11, 2011 off the Pacific coast of Northeastern Mw9.0 earthquake in Japan, the world witnessed catastrophic disasters caused by destructive earthquakes. The earthquake posed a great threat to the development of society and economy, especially in the developing countries such as China. In order to reduce the losses in peoples life and properties in maximum possibilities, there were a lots of technologies had been researched and developed, among them the earthquake early warning system （EEWS） and rapid seismic instrumental intensity report （RSIIP） are the two of the state-of-the-art technologies for the purpose. They may be used to minimize property damage and loss of life and to aid emergency response after a destructive earthquake.
文摘Purpose To compare and assess differences in the career performance progressions of elite junior and Olympic track and field athletes.Methods Annual best performances from top 8 men and women(e.g.finalists)in track and field events at the 2000 World Junior Championships(junior cohort)and the 2000 Olympic Games(Olympic cohort)were examined.Annual bests of these finalists were tracked each year from select groups:sprints(100 m,200 m),distance(1500 m,5000 m),jumps(long jump,high jump),throws(discus,shot put).Age of best lifetime performance,age of final posted performance,and improvement from junior-age best to lifetime best performance were compared between groups.Results Olympic finalists achieved lifetime best performances at later ages than junior finalists[26.0±4.0 years vs.21.1±3.5 years;age difference 90%CI(3.7-5.2 years),P<0.001],and this significant age difference between cohorts was found within all four groups.Olympic finalists improved from under-20 best to lifetime best more so than junior finalists[6.1±4.8%vs.2.5±2.3%;Age difference 90%CI(2.5-4.8%),P<0.001].Of 130 junior finalists,54 did not improve after age 19,while 19 of 128 Olympic finalists posted no improvement after age 19.Conclusion The data suggest that these two populations have different career performance progressions and challenge the notion that achieving elite success as a junior athlete is a prerequisite for the same success at the senior level.
