催化动力学荧光法测定中草药对羟基自由基的清除率

苯甲酸具有很弱的荧光,在Co2+的催化下,过氧化氢能氧化苯甲酸发出强的荧光。中草药提取物可以清除溶液中的·OH, 使产物的生成量减少, 从而使溶液的荧光增加程度降低。据此原理建立了一种测定中草药对羟基自由基清除率的催化动力学荧光新体系。当中草药的浓度为4.0 mg(干重)·mL-1时,测得紫花地丁、苍术和赤芍对羟基自由基的清除率分别为60.8%,40.1%和94.3%。该方法与分光光度法测定结果相比无显著性差异。     

诺氟沙星的荧光光谱研究及其应用

采用荧光光谱法研究了诺氟沙星在不同pH条件下的光谱行为,发现诺氟沙星在pH 3.04的水溶液中具有较强的荧光发射,与中性介质相比荧光发射光谱红移了30 nm。据此分别建立了药物制剂中和人体尿液中诺氟沙星的荧光光谱法和同步-导数荧光光谱法。经样品测定,其线性范围为0.016～0.96 μg·mL-1,检出限为0.016 μg·mL-1, 回收率为99.7%～100.94%, 相对标准偏差为1.65%～2.86%。     

Matlab在伏安特性实验中的应用

采用Matlab分别对线性电阻、发光二极管、太阳能电池的伏安特性实验数据进行曲线拟合,为理论分析与实验数据处理提供了方便。     

Quantum Speed Limit of a Photon under Non-Markovian Dynamics

Quantum speed limit （QSL） time under noise has drawn considerable attention in real quantum computational processes. Though non-Markovian noise is found to be able to accelerate quantum evolution for a damped Jaynes-Cummings model, in this work we show that non-Markovianity will slow down the quantum evolution of an experimentally controllable photon system. As an application, QSL time of a photon can be controlled by regulating the relevant environment parameter properly, which nearly reaches the currently available photonic experimental technology.     

Manipulating Single-Photon Transport Properties in an Asymmetrical Waveguide Coupled to a Whispering-Gallery Resonator Containing a Two-Level Atom

A hybrid system containing an asymmetrical waveguide coupled to a whispering-gallery resonator embedded with a two-level atom is designed to investigate single-photon transport properties. The transmission and reflection amplitudes are obtained via the discrete coordinates approach. Numerical simula, tion demonstrates that a tri- frequency photon attenuator is realized by controlling the couplings between the asymmetrical waveguide and the whispering-gallery resonator. The phase shift, group delay and dissipation effects of the transmitted single-photon are also discussed.     

用"删除法则"求3个同科电子的光谱项

提出了3个同科电子体系在L-S耦合中确定光谱项的“删除法则”,并加以证明．利用“删除法则”可以很方便地求出3个同科电子所形成的光谱项．     

A STUDY ON ABSORPTION OF Na ATOMS ON Si(100) 2×1 SURFACES WITH DV-Xα METHOD

The Na absorption on Si(100) 2×1 surface is studied with quantum chemistry molecular cluster method. The calculated results show that the most favourable absorption site of Na is the cave site and the charge transfer of Na atom to Si is large when the Na coverage is smaller than 0.5 monolayer (ML). A Na chain is formed along the cave sites at the 0.5 ML Na coverage, the charge transfer then becomes small. The calculated density of states show that the Na atoms are metallic along the chain. At 1 ML coverage, the Na atoms occupy both the cave and pedestal sites and form a double-layer. There is a charge transfer of 0.5e from each Na atom to the Si surface. The calculated surface energy shows that the saturation absorption of Na on Si surface is 1 ML.     

复杂厂房噪声传播

本文导出一个工业厂房噪声传播数学模型.这模型适用于任意形状、任意边界条件和有任意障碍物的厂房.发展这个模型的目的是为了电厂噪声预测.电厂厂房噪声传播测量结果表明,模型有很高精度和对各类复杂厂房的适应性。     

激光束准直检测仪：原理,功能与精度

根据先前曾提出的单楔板旋转原理与实验研究,一种定量检测光学系统离焦量及激光发散度的仪器已经研制成功.本文概括地介绍了该仪器原理、主要功能、测试方法及精度评价等.由于本仪器具有一系列优点,已成为激光实验、光学教学及光学工程必备的仪器     

纯热传导冷却产生软X射线激光

本文通过n_e=1×10~(19)cm~(-3)的热等离子体,在纯热传导冷却机制下的计算,得到了等离子体温度的时空变化,并运用碰撞-辐射模型计算了在这种条件下,类锂铝离子4f-3d,5f-3d跃迁的增益系数,计算表明:只要有合适的初始条件,用纯热传导冷却机制,也能产生软X射线激光增益.