By overcoming fabrication limitations, we have successfully fabricated silica toroid microcavities with both large diameter(of 1.88 mm) and ultra-high-Q factor(of 3.3 × 10~8) for the first time, to the best of ou...By overcoming fabrication limitations, we have successfully fabricated silica toroid microcavities with both large diameter(of 1.88 mm) and ultra-high-Q factor(of 3.3 × 10~8) for the first time, to the best of our knowledge. By employing these resonators, we have further demonstrated low-threshold Kerr frequency combs on a silicon chip,which allow us to obtain a repetition rate as low as 36 GHz. Such a low repetition rate frequency comb can now bedirectly measured through a commercialized optical-electronic detector.展开更多
该研究采用超高效液相色谱-高分辨质谱(ultra performance liquid chromatography-Q/Orbitrap high resolution mass spectrometry,UPLC-Q/Orbitrap HRMS)结合柱前衍生建立了白酒样品中甲醛含量的分析方法。白酒样品经乙酰丙酮衍生,通...该研究采用超高效液相色谱-高分辨质谱(ultra performance liquid chromatography-Q/Orbitrap high resolution mass spectrometry,UPLC-Q/Orbitrap HRMS)结合柱前衍生建立了白酒样品中甲醛含量的分析方法。白酒样品经乙酰丙酮衍生,通过全扫描/数据依赖性二级扫描(Full MS-ddMS 2)模式检测,外标法定量。该方法在5.1~202.0μg/L范围内线性良好(R 2>0.99),相对标准偏差<5.0%,平均加标回收率在85.66%~116.50%,适用于白酒样品中甲醛含量的检测分析。运用该方法分析酱香型白酒酿造过程甲醛含量变化,确定酱香型白酒中甲醛主要产生于贮存过程,其中三、四、五、六轮次基酒甲醛含量最高,可能含有较高的甲醛前体物质,是白酒生产过程中甲醛产生的关键风险点。展开更多
基金National Key R&D Program of China(2017YFA0303703,2016YFA0302500)National Natural Science Foundation of China(NSFC)(61435007,11574144,61475099)+1 种基金Natural Science Foundation of Jiangsu Province,China(BK20150015)Fundamental Research Funds for the Central Universities(021314380086)
文摘By overcoming fabrication limitations, we have successfully fabricated silica toroid microcavities with both large diameter(of 1.88 mm) and ultra-high-Q factor(of 3.3 × 10~8) for the first time, to the best of our knowledge. By employing these resonators, we have further demonstrated low-threshold Kerr frequency combs on a silicon chip,which allow us to obtain a repetition rate as low as 36 GHz. Such a low repetition rate frequency comb can now bedirectly measured through a commercialized optical-electronic detector.