由奇偶相干态组成的第ⅣV种四态叠加多模叠加态光场的等阶N次方Y压缩

根据量子力学中的线性叠加原理,构造了由多模奇相干态和多模虚偶相干态组成的第Ⅳ种四态叠加多模叠加态光场|ψ(4)oe,Ⅳ〉q.利用多模压缩态理论,研究了态|ψ(4)oe,Ⅳ>q的等阶N次方Y压缩特性.结果发现1)当压缩阶数为偶数时,态|(4)oe,Ⅳ〉q始终不呈现等阶N次方Y压缩效应.a)当压缩阶数N=4m(m=1,2,3,……)时,态|ψ(4)oe,Ⅳ〉q恒处于等阶N-Y最小测不准态;b)当N=4m'+2(m'=0,1,2,……)时,态| ψ(4)oe,Ⅳ〉q可呈现"半相干态"效应;2)当压缩阶数为奇数时,在不同的条件下,态|ψ(4)oe,Ⅳ〉q可分别呈现以下几种状态a)第一正交分量可呈现等阶N次方Y压缩效应;b)第二正交分量可呈现等阶N次方Y压缩效应;c)态|ψ(4)oe,Ⅳ>q可呈现"半相干态"效应.     

基于光码分多址技术的塑料光纤接入网探讨

本文通过对多信道光接入网复用和多址接入方式的分析,提出一种基于光码分多址(OCDMA)技术的塑料光纤接入网结构,同时给出了适合于多媒体信息业务传输的控制协议以及低成本的硬件实现方案,为实现光接入网的最终目标即光纤到办公室(FTTO)或光纤到家庭(FTTH)提供了一条有效的途径.     

SiGe/Si多量子阱中的光致子带间吸收研究

本文论述了硅锗量子阱中的光致子带间吸收的机理,并在实验中探测SiGe/Si量子阱价带间的红外光致吸收.载流子由氩离子激光器作为光泵浦源产生,所导致的红外吸收由一个步进式傅里叶变换光谱仪来探测.在硅锗量子阱中的光致吸收有两个来源:类似单一掺杂的SiGe薄层的体吸收的自由载流子吸收,及量子阱价带的子带间吸收.实验探测了TE和TM偏振方向的吸收.TM偏振方向的吸收是由偏离布里渊带中心的载流子的跃迁所造成的.我们认为这种光致吸收技术在研究价带耦合效应及其对子带间吸收的影响是非常有效的.     

枕型二维位敏探测器的结构和性能研究

本文从二维位敏探测器(PSD)的结构和性能的比较出发,对枕型结构PSD的性能作了理论上的推导和分析,由此得到的结论和现有的实验结果相符.     

Multimode resonance bandpass filter with twin wideband channels

A bandpass filter with twin wideband channels in a single-layer guided-mode resonance grating is presented.Strong refractive-index modulation is used to support the excitation of multimode resonances TE1,0,TE1,1,TE2,0,TE1,2,and TE2,1,which are excited by the first and second diffraction orders,relate asymmetrical line shapes and broad low-transmission bands,where TE is the transverse electric.Taking advantage of narrow linewidth and sharp edge line shape in the spectra of TE2,υ(v is the mode),a bandpass filter with form factors of 0.61 and 0.7 for long-and short-wave channels is presented to demonstrate this concept.     

ACCURACY ENHANCEMENT FOR THE SIGNORINI PROBLEM WITH FINITE ELEMENT METHOD

In this paper,we study the accuracy enhancement for the frictionless Signorini problem on a polygonal domain with linear finite elements.Numerical test is given to verify our result.     

Nonorientable regular embeddings of graphs of order pq

In [J. Algeb. Combin. 19(2004), 123-141], Du et al. classified the orientable regular embeddings of connected simple graphs of order pq for any two primes p and q. In this paper, we shall classify the nonorientable regular embeddings of these graphs, where p ≠ q. Our classification depends on the classification of primitive permutation groups of degree p and degree pq but is independent of the classification of the arc-transitive graphs of order pq.     

Camera-based model to predict the total difference between effect coatings under directional illumination

A camera-based model is established to predict the total difference for samples of metallic panels with effect coatings under directional illumination,and the testing results indicate that the model can precisely predict the total difference between samples with metallic coatings with satisfactory consistency to the visual data. Due to the limited amount of testing samples,the model performance should be further developed by increasing the training and testing samples.     

Design of the pulse duty cycle of the pseudolite signal in local area augmentation systems

The short-pulse TDMA signal is an excellent solution to the near-far problem in the pseudolite augmentation systems,and the pulse duty cycle is an important element in the solution.This paper aims at designing the duty cycle of the pseudolite pulse signals with a theoretical method.At first,the scope of the duty cycle is derived theoretically with the object of ensuring the reception of both the pseudolite signals and the satellite signals,and the expression for the theoretical upper limit is given.Then bas...