無(wú)人機(jī) Unmanned Aerial Vehicle (UAV)

　　The universal platform of the China-developed Wing Loong-1 Unmanned Aerial Vehicle (UAV) has been tested fit for facilitating space-air-ground emergency communication.

　　The Wing Loong-1 UAV universal platform was loaded with wireless communication base station equipment, and hovered at an altitude of 3 to 5 km across a radius of 3 km during the tests. It provided prolonged and stable coverage over 50 square km with continuous mobile signals, a record high domestically for air-to-ground coverage from an airborne base station.

　　中國(guó)自主開發(fā)的翼龍I無(wú)人機(jī)通用平臺(tái)已完成測(cè)試，將服務(wù)于空地協(xié)同應(yīng)急通信保障需要。

　　翼龍I無(wú)人機(jī)通用平臺(tái)搭載無(wú)線通訊基站設(shè)備，測(cè)試期間，在海拔3千至5千多米高度、以半徑3千多米持續(xù)盤旋，成功實(shí)現(xiàn)超過(guò)50平方公里范圍內(nèi)、長(zhǎng)時(shí)穩(wěn)定的連續(xù)移動(dòng)信號(hào)覆蓋，創(chuàng)下了國(guó)內(nèi)空中基站對(duì)地覆蓋最大面積的新紀(jì)錄。

　　自由電子激光裝置 free electron laser

　　Scientists from the Dalian Institute of Chemical Physics, under the Chinese Academy of Sciences (CAS), and Tsinghua University, using China-developed vacuum ultraviolet free electron lasers, have observed a 3D structure in a water cluster, which is composed of five water molecules.

　　In chemistry, a water cluster is formed by molecules of water. When water molecules reach a certain number, the water cluster will present 3D structures. A water cluster with a 3D structure can be called a water droplet. Previous studies show that the smallest water droplet is composed of six molecules. This discovery, therefore, has changed the understanding of water structure.

　　中國(guó)科學(xué)院大連化學(xué)物理研究所和清華大學(xué)的科學(xué)家利用中國(guó)自主研制的真空紫外自由電子激光裝置，在由五個(gè)水分子組成的水團(tuán)簇中發(fā)現(xiàn)了三維立體結(jié)構(gòu)的存在。

　　從化學(xué)角度來(lái)說(shuō)，水團(tuán)簇由水分子形成。當(dāng)水分子達(dá)到一定數(shù)量時(shí)，水團(tuán)簇將呈現(xiàn)三維立體結(jié)構(gòu)。具有三維立體結(jié)構(gòu)的水團(tuán)簇稱為水滴。以往研究認(rèn)為，最小的水滴由六個(gè)水分子組成，而此次研究發(fā)現(xiàn)突破了對(duì)水結(jié)構(gòu)的認(rèn)知。

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