聚天下彩票|Race is on for speedier rail travel

本文来源:http://www.eefx.com.cn/a/3607.365128.com/

乐成彩票 www.eefx.com.cn,在全省范围内复制推广的改革事项有,投资管理领域:负面清单以外领域外商投资企业设立及变更审批改革、税控发票领用网上申请、企业简易注销等3项;贸易便利化领域:依托电子口岸公共平台建设国际贸易单一窗口,推进单一窗口免费申报机制,国际海关经认证的经营者(AEO)互认制度,出境加工监管,企业协调员制度,原产地签证管理改革创新,国际航行船舶检疫监管新模式,免除低风险动植物检疫证书清单制度等7项;事中事后监管领域:引入中介机构开展保税核查、核销和企业稽查,海关企业进出口信用信息公示制度等2项。如果您熟悉这个孩子,或是认识孩子的父母,请与我们联系,帮助这个孩子回到父母身边。

2018-06-12 10:16 chinadaily.com.cn

打印 放大 缩小

Bullet train upgrades in the works, CASIC studying maglev hyperloop

China's commercial bullet train will be able to go even faster if the vibration noise it generates is brought under control, a member of the Chinese Academy of Engineering said.

"China has tested a wheeled bullet train at speeds up to 420 km per hour in operation. ... The safety index is totally fine - including the derailment coefficient, shock absorption, vertical acceleration and horizontal acceleration - leaving the vibration noise (unsolved)," He Huawu said in a China Central Television program on Sunday night.

He, a member of the Chinese Academy of Engineering, is the chief engineer of China Railway Corp, the nation's railway operator.

Like building a sealed viaduct above road to end the noise from passing traffic, the vibration noise needs a special structure to resolve it. China can handle some easy tasks in four or five years, but extra work is needed for a long-term goal, he said.

Long-term goals are more complicated, such as building a low-pressure underground tube, the engineer said.

China's fastest wheeled train in commercial use, the Fuxing, or Rejuvenation, runs daily at 350 km/h between Beijing and Shanghai.

In the test He mentioned, two bullet trains passed in opposite directions, both traveling at 420 km/h in July 2016. It was done to collect data on factors such as energy costs and vibration noise that occur at high speeds.

"The success of the experiment demonstrates that China has mastered comprehensive knowledge of the bullet train's core technologies," Zhou Li, a China Railway Corp official, said in an interview in July 2016.

He, of the academy, also spoke of China's future ultrafast train. "China already has a maglev line. ... By persisting in development, China is expected to build an ultrafast train in 10 years," he said.

The world's fastest commercially operated integral rail vehicle, carried by Germany's Transrapid maglev, travels on the Shanghai Pudong International Airport Maglev Line, with a maximum operating speed of 430 km/h.

He also referred to the announcement by Elon Musk, CEO of SpaceX and Tesla, that he was working on building an ultrafast transport system popularly known as hyperloop in California. A hyperloop is a sealed tube through which a vehicle can travel at ultrahigh speeds uninhibited by air resistance.

"Musk is raising money worldwide to turn his concept into a project.... Musk only has a concept, but China already has a maglev line," he said.

China Aerospace Science and Industry Corp, one of the nation's major space contractors, began hyperloop research and development, in Wuhan, Hubei province, in July 2017.

The CASIC hyperloop will be a maglev line on which a streamlined, engineless train will travel on partly elevated tubes or tunnels at speeds reaching 1,000 km/h.

"In the future, we will develop technologies that allow a train to travel at 2,000 and even 4,000 km/h," said Mao Kai, chief designer of the system at the company. "Once our development is successful, we plan to construct a short-distance line for trial runs."

Zhao Lei contributed to this story.

来源标题:Race is on for speedier rail travel

责任编辑:元小娜(QN0049)

Related Stories

大赢家湖南幸运赛车 电子游戏的危害的事例 快乐十分玩法福彩广东 新疆11选5基本走势图 六 合 彩 资料app
澳洲彩票 广东快乐十分杀号网站 360时时彩杀号专家三爷 刮刮乐拖把 体彩p5和值走势图带连线图