利用CARS方法研究超短脉冲激光的脉冲宽度

在理论上提出了利用两光束CARS/CSRS方法测量超短脉冲激光的三阶相关函数。实验上在几种样品中测量了CARS/CSRS的时间特性,得到了泵浦光脉冲,SCDL输出光脉冲以及受激喇曼散射光脉冲的宽度。     

Selectivity of seismic electric signal (SES) of the 2000 Izu earthquake swarm: a 3D FEM numerical simulation model

Although seismic electric signal (SES) has been used for short-term prediction of earthquakes, selectivity of SES still remains as one of the mysterious features. As a case study, we made a numerical simulation based on a 3D finite element method (FEM) on the selectivity of SES observed in the case of the 2000 Izu earthquake swarm. Our numerical results indicated that the existence of conductive channel under Niijima island could explain the reported SES selectivity.     

准单模掺锗硅芯光纤的受激喇曼散射中的模竞争

本文报道了准单模掺锗硅芯光纤的受激喇曼散射中的模竞争实验研究。观察到了喇曼竞争现象和喇曼跳级现象。较详细分析了受激喇曼模的竞争。     

Possible relationship between Seismic Electric Signals (SES) lead time and earthquake stress drop

Stress drop values for fourteen large earthquakes with M(W)> or =5.4 which occurred in Greece during the period 1983-2007 are available. All these earthquakes were preceded by Seismic Electric Signals (SES). An attempt has been made to investigate possible correlation between their stress drop values and the corresponding SES lead times. For the stress drop, we considered the Brune stress drop, Deltasigma(B), estimated from far field body wave displacement source spectra and Deltasigma(SB) derived from the strong motion acceleration response spectra. The results show a relation may exist between Brune stress drop, Deltasigma(B), and lead time which implies that earthquakes with higher stress drop values are preceded by SES with shorter lead time.     

SES微波脉冲压缩系统瞬态特性的模拟研究

 通过MATLAB编程,实现了储能切换（stored energy switch）方式产生高功率微波脉冲瞬态响应过程的模拟。程序可用于研究微波压缩系统的功率增益、储能转换效率及脉宽压缩比等主要指标与系统开关耦合腔的固有品质因数、输入与输出耦合系数的关系;并可用于对工作频率失谐、“开关”导通前的泄漏及“开关”启动时间的影响等进行分析,输出瞬态响应过程图像。     

Synthesis of the chlorofusin cyclic peptide

An efficient and convergent solution-phase synthesis of the cyclic peptide of the natural product chlorofusin, a reported inhibitor of the MDM2-p53 interaction, is detailed.     

基于芯片实验室技术的表面增强光谱学在分析科学中的应用

集成具有一序列微流控操作单元的芯片实验室技术,在微流控通道内铺陈金属纳米粒子(尤其是金、银以及铜纳米粒子)作为衬底,泵入多通道微纳升分析物,用于联用表面增强光谱在痕量、实时、原位、过程反应等检测中具有重要的意义。这种联用检测技术集成了芯片实验室和表面光谱两种技术的优点：芯片实验室技术集成流程式分步操作,实现筛选取样,分段、实时反应检测,减小样品量,稳定测试环境等优势以及表面增强光谱的光谱响应快,灵敏性和选择性强、原位检测等优点。借助于Drude模型以及适当的边界条件,外电场引发金属颗粒价电子的局域等离子振荡,并推导了产生共振的局域表面等离子增强以及受激感应偶极子振荡产生表面拉曼增强的物理电磁增强机制。综述了芯片实验室表面局域等离子检测在生物、医药、食品安全等方面的应用,检测通道的增加促使检测效率有较大的提高,同时检测限能力获得较大的突破。综述了芯片实验室技术结合表面增强拉曼光谱公共安全、生物医学、电化学和生物传感器等领域的应用, 表面增强拉曼光谱的高度灵敏性以及指纹性应用于痕量检测。根据芯片实验室技术在研究开发和应用已经获得不断的进展,结合3D打印技术,精准控制多通道结构尺寸,更好地满足设计的需求。表面等离子增强光谱以及表面增强拉曼光谱等表面光谱检测技术在应用上日趋成熟,获得突破传统显微镜的光学极限的分辨能力。这种联用技术在实际定性或者半定量痕量分析检测应用中具有光明的前景。