POSITIVE PERIODIC SOLUTION OF A PREDATOR-PREY SYSTEM WITH TIME DELAY

By using continuation theorem in coincidence degree theory,we study the existence of positive periodic solution for a delay and mutual interference predator- prey system with functional response,and obtain sufficient conditions for the existence of positive periodic solution.     

Design Considerations of a Television Camera Detecting Oil Slicks on the Sea

This paper describes a television camera system that automatically captures exclusive images of an oil slick on the sea. The system includes two optical wavelength filters (WFs), two charge coupled devices (CCDs), and a differential image circuit that produces an absolute value of a difference signal between two output images from CCDs. The operating principle is based on the fact that, due to the multiple-beam interference in the oil slick, there is a marked difference of intensity between light reflected from the surface of the sea and that from the slick. The probabilities to sense slicks under various conditions were calculated using two types of WF, i.e., a space-invariant WF and a space-variant WF, and it was found that the latter was far superior to the former.     

非线性干涉滤光片N形反射光双稳器件的研究

对Ｎ形反射光双稳器件的结构进行了理论设计和实验研究，对光双稳的重要参数δＩ０、δＩｒ与初始失调量δ之间的关系进行了描绘，并通过引入ＺｎＳｅ薄膜的色散关系，使这一理论方法具有自洽性。最后，文章给出了通过这一方法设计的非线性干涉滤光片Ｎ形反射光双稳器件的实验结果。     

一种新型的散斑干涉实验

本文介绍一个用ＣＣＤ摄像机代替常规的全息干版记录图像，并存储在计算机里进行计算机处理，在电视屏幕上实时观察到干涉散斑场的相关条纹，从而测量出物体微小位移。是一个光、电与计算机相结合的综合实验。     

Entropic formulation of uncertainty relations

We review the recent investigations on the improved formulation of uncertainty relations which employ the information-theoretic entropy rather than variance as a measure of uncertainty. We show that this formulation also brings out clearly the relation between the overall uncertainty and the quantum mechanical interference due to measurements. Lecture delivered at the International Symposium on Theoretical Physics, Bangalore, November 1984.     

Holographic grating based Ebert spectrograph

In this paper we discuss the aberration properties and design procedure of in-plane Ebert spectrograph using conventional as well as holographic diffraction gratings. In both cases the gratings are situated at the well-known √3-position so that the spectrum can be recorded on a flat surface. It has been found that the holographic grating system has better resolution than the conventional grating system. The design parameters of a medium sized holographic grating spectrograph in which a concave spherical mirror is mounted in the off-axis configuration have been specified. The performance of the spectrograph has been evaluated by plotting spot diagram.     

Kalman滤波法校正火焰原子吸收光谱干扰

本文将Ｋａｌｍａｎ滤波法应用于原子吸收光谱中，对光谱严重叠加的锰和镓进行了校正，讨论了波长测量点的选取技术对实际结果的影响。１６个合成样品的测定结果表明该法简单，有效。     

Quantum interference effects in the Br2 electronic predissociation: Dependence upon the molecular properties

The occurrence of quantum interference in the Br₂ electronic predissociation has been observed for the first time. It is also shown that the quantum interference effects are strongly dependent upon the representation of the molecular properties, such as the kinetic coupling and the transition dipole moment. The fast Fourier transform method implemented within the wave packet formalism was used to simulate the time evolution of the molecular system under the influence of single monochromatic ultrashort laser pulses. The quantum interference has been inferred from the oscillatory behavior of the autocorrelation functions, which have also been used to calculate the cross-sections, the branching ratios, and the selectivity. © 2003 Wiley Periodicals, Inc. Int J Quantum Chem, 2004     

玩具激光器在薄膜干涉和布朗运动实验中的巧用

利用玩具激光器对薄膜干涉和布朗运动实验进行改进,使实验现象更加明显、直观.