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|HUANGSHAN http://www.panthersrookiestore.com/Panthers-James-Bradberry-Jersey/ , China, Oct. 22 (Xinhua) -- Former Olympic champion Ye Shiwen took her first national title of breaststroke here on Sunday by winning the 100m race at the Chinese Swimming National Championships.
Her timing of one minute and 9.26 seconds is nearly five seconds behind the national record, but the two-time Olympic champion in individual medley events was quite satisfied with her performance on Sunday evening.
"It's my personal best in the event http://www.panthersrookiestore.com/Panthers-Jj-Jansen-Jersey/ ," said the 21-year-old, "I'm a little bit surprised by the title."
Ye finished fourth in the 50m backstroke final on Saturday and was fifth in the 50m breaststroke on Friday.
Teenager Wang Yichun from Shandong was the only swimmer who finished the women's 100m butterfly final within one minute. After clocking in 58.80 seconds, the 12-year-old grabbed her second national title.
Wang's first national title came on Saturday as she won the 50m butterfly final with a personal best result of 25.95 seconds http://www.panthersrookiestore.com/Panthers-Harrison-Butker-Jersey/ , 0.58 seconds behind the national mark.
"I started swimming at the age of six," said Wang. "I haven't thought about my future plan. I just want to keep training and to see what will happen."
Wang finished fourth in the 100m butterfly event at the National Games with a personal best of 58.44 seconds, 1.03 seconds behind the gold medalist Zhou Yilin.
In other actions http://www.panthersrookiestore.com/Panthers-Greg-Olsen-Jersey/ , Yang Junxuan of Shandong won the women's 200m freestyle in one minute and 58.02 seconds. Her teammate Wang Peng took victory in the men's 50m backstroke in 25.60 seconds.
NEW YORK, Nov. 1 (Xinhua) -- New York Marathon organisers revealed late on Tuesday that some media events have been postponed following Tuesday's terrorist attack in Manhattan, but all other races will continue as planned.
"With respect to the victims and their families http://www.panthersrookiestore.com/Panthers-Graham-Gano-Jersey/ , we will be postponing our ceremonial Blue Line Painting and Faces of the Marathon media events originally scheduled for Wednesday," the organisers said in a statement.
"We are monitoring the situation closely with our city, state http://www.panthersrookiestore.com/Panthers-Fozzy-Whittaker-Jersey/ , and federal agency partners, particularly the NYPD. For this weekend's marathon, as with all of our events http://www.panthersrookiestore.com/Panthers-Ed-Dickson-Jersey/ , the safety and security of our runners, staff, volunteers http://www.panthersrookiestore.com/Panthers-Devin-Funchess-Jersey/ , and spectators is our top priority," the statement said.
"We have extensive safety and security measures in place, both visible and behind the scenes. We are constantly reviewing our plans with law enforcement and will consider any necessary modifications or enhancements."
An estimated 50 http://www.panthersrookiestore.com/Panthers-Derek-Anderson-Jersey/ ,000 runners are expected to run Sunday's race, which begins on Staten Island and winds through all five boroughs.
by Zou Huitong， Chen Yanbei
LOS ANGELES， Nov. 2 (Xinhua) -- Almost all materials expand as temperature increases. A new lightweight metamaterial may provide a new way to construct sustained infrastructures and improve our lives， a materials scientist told Xinhua on Monday.
Common materials have the property of "positive thermal expansion，" meaning when heated， they expand. In the past， railway tracks are built with separate parts. There are "thermal gaps" between neighboring components. The gap serves as a buffer zone， so that the components would not squeeze into each other and make the whole construction deformed. Although the welded tracks we see now have been stretched in advance before being installed， they are still under the risk of buckling.
A new 3D-printed lightweight material may provide a solution: engineers from USC， MIT， UCLA and Lawrence Livermore National Laboratory (LLNL) successfully made it shrink when heated. The result was recently published in the journal Physical Review Letters.
This new material is what scientists call a "metamaterial，" a composite material with custom-designed structure not normally found in nature. It is made from a lattice with star-shaped structures， and incorporates two separate materials with different， but positive， thermal expansion coefficients and elastic properties. One is a stiff， slow-to-expand copper-containing material， the other a more elastic， fast-expanding polymer substance.
Although proposed theoretically in the mid-1990s， these structures have only been produced now using 3D printing technology， in particular a new technique， named "microstereolithography，" by the Fang Lab at MIT. Researchers plan to explore new 3D printing technologies so that they can create structures with more than two materials.
Ultimately， the limitations of the current 3D printing technology would be the biggest challenge facing scientists to further exploration. As the printer requires the material to be in certain forms (e.g. liquefied， powdered， etc.)， how to synthesize new materials that can be used in 3D printing technology is the first problem to tackle. "This is the part where we need the help from chemists." Wang said.
For application that requires materials to resist thermal expansion rather than shrink with increasing temperature， scientist have two approaches. "One is to combine this material with negative thermal expansion with those with positive thermal expansion， while the other is to improve the design of the currently shrinking structure，" Qiming Wang， an assistant professor at the University of Southern California， told Xinhua.
Zero expansion materials can improve our lives. Traveling by railways will be safer， bridges and other infrastructures will be more sustained， computers will perform better with more stable microchips as those are in use today whose performance are currently hampered by rising temperatures during long-time use.
"In terms of dental filling，" Dr. Wang said， "optimally put， if we manage to find biocompatible material， which means that it would not cause conflicts with human bodies， consumers can expect to witness those materials being put in practical use in the nea.