QUANTUM MECHANICAL MODEL AND SIMULATION OF GaAs／AlGaAs QUANTUM WELL INFRARED PHOTODETECTOR—Ⅱ ELECTRICAL ASPECTS

ＩｎｔｒｏｄｕｃｔｄｏｎＩｎｔｈｅｆｉｒｓｔｐａｒｔ ,ｗｅｈａｖｅｄｉｓｃｕｓｓｅｄｔｈｅｏｐｉｔｉｃａｌａｓｐｅｃｔｓａｂｏｕｔｔｈｅｑｕａｎｔｕｍｗｅｌｌｉｎｆｒａｒｅｄｐｈｏｔｏｄｅｔｅｃ ｔｏｒ .Ｈｅｒｅｗｅｃｏｎｔｉｎｕｅｄｉｓｃｕｓｓｉｏｎｓａｂｏｕｔｔｈｅｅｌｅｃｔｒｉｃａｌａｓｐｅｃｔｅｓｏｆｔｈｅｄｅｖｉｃｅｍｏｄｅｌａｎｄｓｉｍｕｌａｔｉｏｎ .1　ＤａｒｋＣｕｒｒｅｎｔａｎｄＰｈｏｔｏｃｕｒｒｅｎｔＤｉｓｔｒｉｂｕｔｅｄｅｆｆｅｃｔｓｏｆｅｘｔｅｒｎａｌｂｉａｓａｃｒｏｓｓｔｈ…     

NONDESTRUCTIVE BAND—GAP PROFILE DETERMINATION OF HgCdTe LPE CROWN LAYERS

ＩｎｔｒｏｄｕｃｔｉｏｎＭｏｓｔｏｆｍｏｄｅｒｎＨｇ1-ｘＣｄｘＴｅｔｅｒｎａｒｙｃｏｍｐｏｕｎｄＩＲｐｈｏｔｏｄｅｔｅｃｔｏｒｓａｒｅｍａｎｕｆａｃｔｕｒｅｄｆｒｏｍＬＰＥｆｉｌｍｓｇｒｏｗｎｏｎＣｄＴｅａｎｄＣｄＺｎＴｅｓｕｂｓｔｒａｔｅｓ[1～ 4 ] .Ｃｏｍｐｏ ｓｉｔｉｏｎａｌｄｅｐｔｈｎｏｎｕｎｉｆｏｒｍｉｔｙｓｅｅｍｓｔｏｂｅａｎｉｎｈｅｒｅｎｔｆｅａｔｕｒｅｏｆｔｈｅｓｅｆｉｌｍｓ[5,6 ] .Ｉｔｃａｕｓｅｓｔｈｅｖａｒｉａｔｉｏｎｓｏｆｂａｎｄ ｇａｐｗｉｔｈｔｈｅｄｅｐｔｈ ,ｔｈｕｓａｆｆ…     

QUANTUM MECHANICAL MODEL AND SIMULATION OF GaAs/AlGaAs QUANTUM WELL INFRARED PHOTO- DETECTOR-Ⅰ OPTICAL ASPECTS

ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｆｒａｒｅｄｄｅｔｅｃｔｏｒｔｅｃｈｎｉｑｕｅｈａｓｂｅｅｎａｋｅｙｆａｃｔｏｒｉｎｔｈｅｄｅｖｅｌｏｐｍｅｎｔｏｆｔｈｅｉｎｆｒａｒｅｄｔｅｃｈｎｏｌｏｇｙｆｏｒｍｏｒｅｔｈａｎ 4 0 ｙｅａｒｓ .Ｓｉｎｃｅ 1970 ,ｓｅｍｉｃｏｎｄｕｃｔｏｒｓｌｉｋｅＩｎＳｂａｎｄＨｇＣｄＴｅｈａｖｅｂｅｅｎｔｈｅｐｒｉｎｃｉｐａｌｍａｔｅｒｉａｌｓｆｏｒｖａｒｉｏｕｓｉｎｆｒａｒｅｄｄｅｔｅｃｔｏｒａｐｐｌｉｃａｔｉｏｎｓ .Ｔｈｅｆｏｒｍａｔｏｆｔｈｅｉｎｆｒａｒｅｄｄｅｔｅｃｔｏｒｍｏｔｉｖａｔｅｄｂｙｓｍａｒｔｔｈｅｒｍａｌｉｍａｇｉｎｇｓｙｓｔｅｍｃｈａｎｇｅｄｆｒｏｍｓｉｎｇｌｅｅｌｅｍｅｎｔｄｅｖｉｃｅｔｏｆｏｃａｌｐｌａｎａｒｒａｙｓ(ＦＰＡｓ)ｉｎｔｈｅｍｉｄｄｌｅｏｆ 80’ｓ [1].Ｔｏｄａｙ’ｓｔｅｃｈｎｏｌｏｇｙｏｆｉｎｆｒａｒｅｄｄｅｔｅｃｔｏｒｃｏｎｃｅｎｔｒａｔｅｓｌａｒｇｅｌｙｏｎｆｏｃａｌｐｌａｎａｒｒａｙｓ ,ｅｘｐｅｃｉａｌｌｙｆｏｒｓｅｎｓｉｔｉｖｅ ,ｈｏｍｏｇｅｎｅｏｕｓａｎｄｌａｒｇｅｆｏｒｍａｔｓｃａｌｅｄｅｖｉｃｅｓ .ＨｇＣｄＴｅ...     

A Study of the Effectiveness of Postal Financial Assets Services

1　Ｉｎｔｒｏｄｕｃｔｉｏｎ　　Ａｓｓｅｔｓｓｅｒｖｉｃｅｓａｒｅｔｈｅｓｅｒｖｉｃｅｓｔｈａｔｈａｎｄｌｅｆｕｎｄ .Ｆｉｎａｎｃｉａｌｏｒｇａｎｉｚａｔｉｏｎｓｒｅａｌｉｚｅｂｕｓｉｎｅｓｓｏｐｅｒａ ｔｉｏｎｂｙｔｕｒｎｉｎｇｔｈｅｆｕｎｄｓａｂｓｏｒｂｅｄｉｎｔｏｅｃｏｎｏｍｉｃｒｅ ｓｕｌｔｓｔｈｒｏｕｇｈａｓｓｅｔｓｓｅｒｖｉｃｅｓ.Ｂｅｃａｕｓｅｏｆｉｔｓｎｅｔｗｏｒｋａｎｄｃｒｅｄｉｔ,ｔｈｅｓａｖｉｎｇｓｄｅｐｏｓｉｔａｂｓｏｒｂｅｄｂｙ ｐｏｓｔｍｕｓｔｂｅｈａｎｄｌｅｄｅｆｆｅｃｔ…     

Estimating Time Delays With Antenna Array

1　ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｐｒｏｂｌｅｍｏｆｕｓｉｎｇａｎａｎｔｅｎｎａａｒｒａｙｔｏｅｓｔｉ ｍａｔｅｔｈｅｔｉｍｅｄｅｌａｙｓｉｓｉｍｐｏｒｔａｎｔｉｎｔｈｅｗｉｒｅｌｅｓｓｃｏｍｍｕｎｉｃａｔｉｏｎｓｙｓｔｅｍ .Ｉｎｓｕｃｈａｓｙｓｔｅｍ ,ｍｕｌｔｉｐａｔｈｔｒａｎｓｍｉｓｓｉｏｎｐｈｅｎｏｍｅｎｏｎｅｘｉｓｔｓａｎｄｃａｎｃａｕｓｅｓｅｖｅｒｅｓｉｇｎａｌｆａｄｉｎｇ .Ｅｓｔｉｍａｔｉｏｎｏｆｔｈｅｍｕｌｔｉｐａｔｈｄｅｌａｙｓ,ａｓｗｅｌｌａｓｔｈｅｓｐａｔｉａｌｓｉｇｎａｔｕｒ…     

Blind Multiuser Receivers for ISI CDMA Channels Using the ε-Approximation Algorithms

1　ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｒｅｉｓｃｕｒｒｅｎｔｌｙａｓｉｇｎｉｆｉｃａｎｔｉｎｔｅｒｅｓｔｉｎｔｈｅｄｅｓｉｇｎｏｆｈｉｇｈ ｒａｔｅｗｉｒｅｌｅｓｓＣｏｄｅＤｉｖｉｓｉｏｎＭｕｌｔｉｐｌｅＡｃｃｅｓｓ (ＣＤＭＡ)ｎｅｔｗｏｒｋｓ[1 ,9～1 0 ] .ＩｎｔｈｉｓＣＤＭＡｓｙｓｔｅｍ ,ｅａｃｈｕｓｅｒｉｓａｓｓｉｇｎｅｄａｕｎｉｑｕｅｓｉｇｎａｔｕｒｅｗａｖｅｆｏｒｍｔｈａｔｉｓｕｓｅｄｔｏｍｏｄｕｌａｔｅｉｔｓｔｒａｎｓｍｉｔｔｅｄｓｙｍｂｏｌｓ.Ｉｔｉｓ,ｈｏｗｅｖｅｒ,ｎｏｔｐｏｓｓｉｂｌｅｔ…     

A Study of Travelling Salesman Problem

1　ＩｎｔｒｏｄｕｃｔｉｏｎＴＳＰｉｓｏｎｅｏｆｔｈｅｍｏｓｔｄｉｆｆｉｃｕｌｔｐｒｏｂｌｅｍｓｔｈａｔｍａｎｙｓｃｈｏｌａｒｓａｌｌｏｖｅｒｔｈｅｗｏｒｌｄｈａｖｅｂｅｅｎｓｔｕｄｙｉｎｇｕｐｔｏｎｏｗ .ＴｈｅｂａｓｉｃｄｅｓｃｒｉｐｔｉｏｎｏｆｔｈｉｓｐｒｏｂｌｅｍｗｈｉｃｈｗａｓｐｒｏｐｏｓｅｄｂｙＫ .Ｍｅｎｇｅｒｆｉｒｓｔｌｙｉｓ:Ａｔｒａｖ ｅｌｌｉｎｇｓａｌｅｓｍａｎｗｉｓｈｅｓｔｏｖｉｓｉｔａｎｕｍｂｅｒｏｆｔｏｗｎｓ,ｔｈｅｔｒａｖｅｌｌｉｎｇｄｉｓｔａｎｃｅｓｂｅｔｗｅｅｎｔｏｗｎ…     

An Analysis and Design of the Virtual Simulation Software Based on Pattern

1　ＩｎｔｒｏｄｕｃｔｉｏｎＶｅｇａｓｙｓｔｅｍ ,ａｓａｒｅｎｄｅｒｉｎｇｄｒｉｖｅｎｓｏｆｔｗａｒｅｐｌａｔｆｏｒｍ ,ｈａｓｂｅｅｎｗｉｄｅｌｙｕｓｅｄｉｎｓｙｓｔｅｍｓｉｍｕｌａｔｉｏｎａｎｄｖｉｒｔｕａｌｒｅａｌｉｔｙ .ＩｔｉｓｍａｉｎｌｙｕｓｅｄｉｎｔｈｅＵＮＩＸｐｌａｔｆｏｒｍ .ＢｅｃａｕｓｅｏｆｔｈｅｅａｓｙｕｓｅａｎｄａｐｐｌｉｃａｔｉｏｎｎｅｅｄｏｆｔｈｅＷｉｎｄｏｗｓＮＴ ,ｔｈｅｓｙｓｔｅｍｏｆＶｅｇａｈａｓａｌｓｏｂｅｅｎｔｒａｎｓｐｌａｎｔｅｄｔｏＷｉｎｄｏｗｓＮＴｆｒｏｍ…     

Performance Analysis of Using ATM LSR to Implement MPLS

1　ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｅｘｐｌｏｓｉｖｅｇｒｏｗｔｈｏｆＩｎｔｅｒｎｅｔｔｒａｆｆｉｃｈａｓｉｍ ｐｏｓｅｄｔｒｅｍｅｎｄｏｕｓｓｔｒｅｓｓｏｎｔｏｄａｙ ｓｒｏｕｔｅｒｓ,ｈｏｗｔｏｉｍｐｌｅｍｅｎｔｈｉｇｈｓｐｅｅｄ ,ｓｃａｌａｂｌｅａｎｄｌａｒｇｅｐｒｏｃｅｓｓｉｎｇｃａｐａｂｉｌｉｔｙｗｈｉｌｅｐｒｏｖｉｄｉｎｇｇｏｏｄｓｅｒｖｉｃｅｓｈａｓｂｅｃｏｍｅｔｈｅｋｅｙｉｓｓｕｅｔｏｄｅｓｉｇｎｍｏｄｅｒｎｒｏｕｔｅｒｆａｃｉｌｉｔｉｅｓ.Ｌａ ｂｅｌ ｓｗｉｔｃｈｉｎｇｔｅｃｈｎｏｌ…     

Improvement real time performance of robot pose optic fiber sensor on screw assem blies

Ｔｈｅｓｅｎｓｉｎｇｍｏｄｅｌｏｆｄｅｔｅｃｔｉｎｇｓｙｓｔｅｍｉｓｕｓｕａｌｌｙｃｏｍｐｌｉｃａｔｅ（ｓｏｍｅｔｉｍｅｓｃａｎｎｏｔｅｘ－ｐｒｅｓｓｅｄｍａｔｈｅｍａｔｉｃａｌｌｙ）．Ｔｈｉｓｍａｋｅｓｉｔｖｅｒｙｄｉｆｆｃｕｌｔｔｏｏｂｔａｉｎｑｕｉｃｋｓｏｌｕｔｉｏｎａｎｄｒｅａｌｔｉｍｅｄｅｔｅｃｔｉｎｇ．Ｔｈｅｐａｐｅｒｔａｋｅｓｔｈｅｐｏｓｅｗａｒｐｏｐｔｉｃｆｉｂｅｒｓｅｎｓｏｒｏｆｒｏｂｏｔｓｃｒｅｗｆｌｅｘｉｂｌｅａｓｓｅｍｂｌｙａｓａｎｅｘａｍｐｌｅ,ａｎｄｉｎｔｒｏｄｕｃｅ…     

综合监控系统控制权移交的设计与实现

本文介绍了在轨道交通综合监控系统（ISCS）中如何进行控制中心和车站之间的内部权限移交,以及ISCS与外部系统之间的外部权限移交。权限移交有两种方式：正常权限移交和强制权限移交。结合实际工程需求,针对BAS子系统设计了控制权移交的方案及实现方法。实践表明,该方案能够满足需求,保证控制的唯一性,使得操作员在控制中心、车站、子系统均能对受控对象进行安全的控制操作。     

利用量子比特间交换衰减实现无退纠缠的量子信息传输

在量子信息传输过程中,环境的作用会导致退相干与退纠缠。利用不同类型量子比特的优点,构成杂化量子比特系统是克服退相干效应,实现量子信息传输的一个有效方案。本文指出：将耦合量子比特之间信息交换过程中存在的能量损耗(量子比特间的交换衰减),与外部环境的退相干效应有机的结合起来,可以实现无退纠缠效应的量子信息传输。给出了实现无退纠缠效应信息传输,交换衰减率与退相干时间匹配的约束关系。     

通信,计算机与消费电子的结合—C＆C＆C（上）

九十年代开始了通信，计算机和消费电子的三结合。文章介绍这三者相结合的意义，对信息化社会的作用及其最新的进展。     

Multi-source Local Color Transfer Based on Texture Similarity

In order to realize automatic region matching between source and target images, a multi-source local color transfer algorithm based on texture similarity is proposed. The source and target images are segmented into a set of regions using an image segmentation algorithm. It computes the texture features of each region through the gray level co-occurrence matrix and then constructs corresponding texture feature vectors. The authors measure the relevance between the target and source regions by computing the Euclidean distance between corresponding tex- ture feature vectors. The source region having the largest relevance with the target region is selected as the transfer source. Complete the color transfer by performing color space transformation and linear conversion on color values. Experimental results concerning on multi-source local color transfer and gray image colorization verify the validity of the proposed algorithm.     

容迟／容断网络传输技术研究

容迟／容断网络（DTN）是从星际网络、卫星网络、AdHoc网络、传感网络等现实网络中抽象出来的一种特殊的网络模型。分析了DTN网络的研究背景和体系结构,重点研究了DTN网络的保管传输技术;通过仿真结果表明,与端到端的传输方式相比,保管传输技术在网络平均吞吐量和数据传输总量方面性能优越,适用于DTN网络。     

基于NIOSII处理器的IEEE-1394b双向数据传输系统

基于FPGA内嵌的NIOSII处理器.设计了一个1394b双向数据传输系统.介绍了该系统的硬件结构.描述了其软件工作流程,主要包括异步传输和等时传榆的具体实现过程.测试结果表明,该系统的传输速率较高、可靠性和实时性较好,并具有一定的应用价值.     

高精度光纤时间频率一体化传递

为满足各工程应用领域对于高精度时间频率同步的需求,降低系统复杂度,保障大规模光纤时频传递网络的顺利建设,该文提出基于伪码调制技术的光纤时间频率一体化传递方法,设计并搭建了光纤时间频率一体化传递系统,完成了光纤单向和双向时频一体化传递。在单向时频传递试验中,分析了温度变化对于系统传输时延的影响;在双向时频传递试验中,实现了时间频率的高精度传递,系统附加时间传递抖动为0.28 ps/s, 0.82 ps/1000 s,附加频率传递不稳定度为4.94×10^–13/s, 6.39×10^–17/40000 s。试验结果表明,该方法实现了时间、频率一体化高精度同步,且系统附加时间传递抖动优于目前各光纤时间同步方案。     

USB接口技术在激光打标中的应用

本文在说明了传统振镜式激光打标控制器所采用的数据传输接口的不足之后,引出了USB接口在激光打标控制器中的应用优势,并分析了它的可行性。最后就打标数据的USB传输方式做了讨论,提出了一些参考意见。     

屏蔽电缆转移阻抗和转移导纳的宽频测量

转移阻抗和转移导纳是表征外界电磁场对屏蔽电缆耦合机理的两个重要参量.基于传输线理论,提出了一种新的测量屏蔽电缆转移阻抗和转移导纳的简便方法.该方法既可以得到转移阻抗和转移导纳的幅频特性,又可以得到其相频特性,且测试系统比较简单.测试频率范围满足电力系统电磁兼容所关心的频段(0.1MHz～10MHz),对于更高频率屏蔽电缆转移阻抗和转移导纳的测量,可以通过选择更短的电缆样品来实现.为了验证测量方法的正确性,与现有方法的测量结果进行了对比.该测量方法可推广用于多芯屏蔽电缆的转移阻抗和转移导纳测量.     

Direct Graphene Transfer and Its Application to Transfer Printing Using Mechanically Controlled,Large Area Graphene/Copper Freestanding Layer

Direct graphene transfer is an attractive candidate to prevent graphene damage, which is a critical problem of the conventional wet transfer method. Direct graphene transfer can fabricate the transferred graphene film with fewer defects by using a polymeric carrier. Here a unique direct transfer method is proposed using a 300 nm thick copper carrier as a suspended film and a transfer printing process by using the polydimethylsiloxane (PDMS) stamp under controlled peeling rate and modulus. Single and multilayer graphene are transferred to flat and curved PDMS target substrate directly. With the transfer printing process, the transfer yield of a trilayer graphene with 1000 µm s^?1 peeling rate is 68.6% of that with 1 µm s^?1 peeling rate. It is revealed that the graphene transfer yield is highly related to the storage modulus of the PDMS stamp: graphene transfer yield decreases when the storage modulus of the PDMS stamp is lower than a specific threshold value. The relationship between the graphene transfer yield and the interfacial shear strain of the PDMS stamp is studied by finite‐element method simulation and digital image correlation.