日批在线视频_内射毛片内射国产夫妻_亚洲三级小视频_在线观看亚洲大片短视频_女性向h片资源在线观看_亚洲最大网

Latest News

Jumbo rocket design poses challenges

By Xin Dingding (China Daily)
Updated: 2013-03-04 06:43

"Scientists are mulling over the idea of using it to launch a manned spaceship in the future, too," said Liang. "If so, the Long March-7 will become the country's only rocket that can send manned and unmanned spacecraft into space."

The Long March-11 is also in development, China's first launch vehicle using solid fuel, which is expected to make its first launch before 2016.

"The development of Long March-11 will greatly improve China's capabilities to rapidly enter space and meet the demand for emergency launches in case of accidents," he said.

The carrier rocket will be easy to operate and cost-efficient to launch, and it can be stored for long periods to launch at short notice.

"If a major earthquake - like the one that rocked Wenchuan of Sichuan province in 2008 - strikes again, we will be able to quickly send satellites into space that can take photos of the devastated area and help with rescue work," Liang said.

Time to mature

Liang expects the next generation of carrier rockets will operate together with earlier models to serve space missions for the next 10 to 20 years.

"A new launch vehicle will not be fully reliable until it carries out at least 10 missions where hidden problems can be exposed and fixed. Sometimes, even after a model has carried out many missions, deeper technical problems will not emerge until it encounters special situations in space," he said.

Time is also needed for the new generation of launch vehicles to become competitive in cost, too, he added.

By then, China's launch systems will be able to send payloads from 1 to 25 tons into three levels of orbit, ranging from 200 km to 35,000 km altitude, and meet the demands of China's short- and mid-term space programs.

But to meet long-term space goals, China will need to develop a rocket with a takeoff thrust of 3,000 tons, three times that of Long March-5, which will be able to send men to the moon.

Research on a heavy-thrust launch vehicle has been carried out in the past years. Scientists visualize a rocket with a diameter of at least 8 meters, able to send a 100-ton payload into low earth orbit.

The academy aims to have the heavy-thrust rocket project approved by the government under the 12th Five-Year Plan period (2011-15), Liang said.

"If approved, China will stand in the same line as space powers such as the United States and Russia regarding launch vehicles, which is the precondition for all space activities," he said.

xindingding@chinadaily.com.cn

Previous Page 1 2 Next Page

主站蜘蛛池模板: 国产精品69久久久久孕妇欧美 | 欧洲久久久久 | 天天综合色网 | 久久青青 | 久久久www成人免费精品 | 精品在线免费视频 | 一区二区三区国产视频 | 精品免费在线视频 | 最近免费中文字幕 | 欧美黄色短视频 | 久久两性视频 | 成人免费视频大全 | 能看黄色的网站 | 超碰丝袜 | 日韩在线不卡视频 | 国产福利91精品一区二区三区 | 欧美一道本| av资源在线看| 欧美黄色a级 | 99国产精品 | 一区二区三区精 | 99精品久久久 | 国产精品9999 | 亚洲色图视频在线 | 在线日韩欧美 | 日本少妇激情视频 | 一级真人毛片 | av中文资源在线 | 国产色自拍 | 一区二区视屏 | 美国特色黄a大片 | 四虎永久免费影院 | 成人久久免费视频 | 国产精品美女久久 | 日韩欧美在线第一页 | 少妇久久久久 | www网站在线观看 | 天天爽夜夜爽夜夜爽精品视频 | 精品无码久久久久久国产 | 免费视频成人 | 在线观看视频福利 |