空间冷原子钟是利用空间微重力环境实现的喷泉冷原子钟.它的稳定度和准确度都优于10-15,将成为空间精度最高的频率标准.空间冷原子铷钟微波源的性能直接影响冷原子铷钟的稳定度特性.本文介绍了一种适用于空间冷原子钟微波源的设计.微波源由电源变换、控制电路、微波链路等组成.测试结果表明,微波源输出6.8GHz信号1Hz处...
柳[liǔ] 外[wài] 澹[dàn] 烟[yān] 光[guāng] ,芊[qiān] 绵[mián] 去[qù] 路[lù] 长[cháng] 。风[fēng] 花[huā] 随[suí] 世[shì] 界[jiè] ,春[chūn] 水[shuǐ] 漫[màn] 池[chí] 塘[táng] 。手[shǒu] 种[zhǒng] 青[qīng] 青[qīng] 许[xǔ] ,堤[dī] ...
I have a good friend, his name is Li Hui, Yuying secondary school, it is his family. This is called his father Li Fuxing, was a mathematics teacher, it's his mother called Liu Lan, is an English teacher, he also had a sister, called Emperor Gaozu of Tang, was a student. This ...
Pb measured in beef and pork was higher than the recommended tolerable daily intake (TDI) for both children and adults while that of Cd, As, Cu, Zn and Fe was <TDI. The probability of an adult developing cancer as a result of consuming SRVM over a 70-year lifetime was greater than U...
空间微重力为冷原子钟提供了一个优越的工作环境.在微重力环境下,抛射的冷原子可以匀速直线运动,因此,对于一微波腔,和微波相互作用时间仅决定于冷原子的运动速度,从而在空间可以很容易获得比地面更长的相互作用时间.我们设计了空间冷原子钟,经历了原理样机、初样和正样研制,完成了所有和空间工程相关的试验,通过了所有功...
lang tao shaqi yi浪淘沙(其一)tangliuyǔxi[唐]刘禹锡jiǔqu huang he wan li sha九曲黄河万里沙,lang tao feng bǒzi tian yá浪淘风簸自天涯。ru jin zhi sheàng yin he qù如今直上银河去,tong dao qian niu zhi niǚjia同到牵牛织女家。重点注释①浪淘沙:原唐代教坊曲,又名“浪淘沙令”“卖花声”...
liǔx(一)柳溪tang han yu [唐]韩愈liu shu shui ren 柳树谁人种,hanghang an gao 行行夹岸①高。mo jiang ji lan 莫将条系缆②zhuo chu you chan 著处有蝉号。注释①夹岸:河流两岸,堤岸的两边。②系缆:系结船索,泊舟。③著处:着处,到处,随处。④蝉号:蝉鸣。1结合诗句,给加点字选择正确的读音,...
G. Jiang, B. Tang, H. Chen, Y. Liu, L. Li, Q. Huang and W. Chen, RSC Adv. , 2015, Accepted Manuscript, DOI: 10.1039/C5RA01972A 来自 RSC publishing 喜欢 0 阅读量: 54 收藏 报错 分享 全部来源 求助全文 RSC publishing 相似文献...
急雨将雷过柳塘,春因底事亦归忙。经时不放荷花叶,昨夜尽收栀子香。判断千林成梦去,安排一夏纳风凉。开眉无觅愁来处,数笔晴云尽水乡。 翻译赏析 繁体原文 䪨律对照 注音对照 收藏 做笔记 🐒🔈 译文:急雨将雷过柳塘,春因底事亦归忙。 经过一番时光,柳塘被急雨和雷声所吞没,春天也因繁忙的工作而...
奉[fèng] 和[hé] 虢[guó] 州[zhōu] 刘[liú] 给[gěi] 事[shì] 使[shǐ] 君[jūn] 三[sān] 堂[táng] 新[xīn] 题[tí] 二[èr] 十[shí] 一[yī] 咏[yǒng] 柳[liǔ] 溪[xī] 朝代:唐 [táng] 作者: 韩愈 [hán yù] 柳[liǔ] 树[shù] 谁...