Superchiral fields generated by nanostructures and their applications for chiral sensing

Chirality is ubiquitous in natural world. Although with similar physical and chemical properties, chiral enantiomers could play different roles in biochemical processes. Discrimination of chiral enantiomers is extremely important in biochemical, analytical chemistry, and pharmaceutical industries. Conventional chiroptical spectroscopic methods are disadvantageous at a limited detection sensitivity because of the weak signals of natural chiral molecules. Recently, superchiral fields were proposed to effectively enhance the interaction between light and molecules, allowing for ultrasensitive chiral detection. Intensive theoretical and experimental works have been devoted to generation of superchiral fields based on artificial nanostructures and their application in ultrasensitive chiral sensing. In this review, we present a survey on these works. We begin with the introduction of chiral properties of electromagnetic fields. Then, the optical chirality enhancement and ultrasensitive chiral detection based on chiral and achiral nanostructures are discussed respectively. Finally, we give a short summary and a perspective for the future ultrasensitive chiral sensing.     

Photoelectric Hybrid Optical Bistable Device Using Fibre Bragg Gratings with Two Feed Signals

A photoelectric hybrid optical bistable device (OBD) is investigated by using fibre Bragg gratings as a lightintensity modulator. A new operation with two feed signals is proposed, and with this method the output characteristic of the OBD is remarkably improved. The potential application of such a device in optic stabilizer for fibre laser is also briefly discussed.     

高频电场处理水泥浆改善其物理特性的实验研究

介绍了利用高频场处理经浆，改善固井水泥浆流变性和水泥抗压强度的实验结果，初步探讨了作用机理。     

微通道板固定图案噪声及测试研究

叙述微通道板的噪声,着重介绍微通道板固定图案噪声及其简便新颖而又实用的一种测试方法,给出测试结果并进行分析。     

用值分布论对Rellich-Wittich定理的推广

本文用N&;lt;evanlinna值分布论对一般n阶常数分方程进行了研究，从而推广了Relich Wittich定理．     

超声波及其应用

超声波及其应用孙汝继（承德农业学校）频率高于２００００赫兹的声振动，人耳听不见，称为超声。第一次世界大战时，法国物理学家郎之万利用超声侦察敌国潜艇可以说是超声技术最早在实际上的应用。几十年来，超声技术突飞猛进的发展已成为面貌全新的专门领域。目前海军使...     

多体无摩擦弹性接触问题的罚有限元法

一、引言弹性接触问题属于局部非线性问题,这是由于系统的接触状态不能事先确定而引起的。一般用有限元法进行求解时,首先要假定接触区域,然后根据接触定解条件来建立系统的刚度方程,由此可解出各节点的位移分量并计算出各接触节点的法向力