排序方式: 共有8条查询结果,搜索用时 484 毫秒
1
1.
电动进样和分离技术是微流控芯片毛细管电泳分析应用中一项重要的技术环节.通过外加电压调节玻璃基材微芯片"十"字通道内的场强分布,改变分析样品在芯片内电渗流的方向和速率,考察样品的分离效率并得出最佳的外加电压控制方案. 相似文献
2.
3.
4.
建立了同时测定宠物食品中赭曲霉毒素A和B的液相色谱-串联质谱分析方法。样品经乙腈/水(1∶1,V/V)提取,HLB固相萃取柱净化。采用Agilent ZOBRAX C_(18)柱(150×2.1mm,5μm)分离,以0.1%甲酸水溶液-乙腈作为流动相,梯度洗脱。目标化合物在多反应监测模式(MRM)下进行检测,外标法定量。在优化的条件下,赭曲霉毒素A和B在0.1~10.0ng·mL~(-1)范围内呈良好的线性关系,相关系数均不低于0.9993,方法定量限分别为0.1μg·kg~(-1)和0.05μg·kg~(-1)。方法平均回收率为78.3%~107.5%,相对标准偏差不大于9.5%。该方法前处理简单、选择性好、灵敏度高,可用于宠物食品中赭曲霉毒素A和B的测定。 相似文献
5.
6.
报道了一种基于玻璃-PDMS复合芯片微流控气动微阀的制作方法,该方法较Unger等[1]的方法更为简单易行,并克服了PDMS芯片气动微阀刚性不足和与外流路连接困难的缺点,提高了微阀的可靠性. 相似文献
7.
Zi-Yuan Li 《中国物理 B》2022,31(12):124204-124204
We investigate high-order harmonic generations (HHGs) under comparison of Weyl cones in two types. Due to the hyperboloidal electron pocket structure, strong noncentrosymmetrical generations in high orders are observed around a single type-II Weyl point, especially at zero frequency. Such a remarkable DC signal is proved to have attributions from the intraband transition after spectral decomposition. Under weak pulse electric field, the linear optical response of a non-tilted Weyl cone is consistent with the Kubo theory. With extensive numerical simulations, we conclude that the non-zero chemical potential can enhance the even-order generations, from the slightly tilted system to the over-tilted systems. In consideration of dynamical symmetries, type-I and type-II Weyl cones also show different selective responses under the circularly polarized light. Finally, using a more realistic model containing two pairs of Weyl points, we demonstrate that paired Weyl points with opposite chirality can suppress the overall even-order generations. 相似文献
8.
1