掺Yb相移光纤光栅形成过程的分析

研究了用二次曝光法制作掺Yb相移光纤光栅的实验过程 ,并对相移光纤光栅制作过程中出现次峰的情况进行了理论分析。合理地解释了该现象     

双层堤基的井涌破坏与无害管涌

双层堤基水文地质结构特殊，堤基承压水常具独特的“渗而不流”特征。在“不流”条件下，堤后盖层薄弱处受超高承压水头顶裂破坏，产生的局部冒水孔实属承压自流井，由此形成的管涌实质为井涌。底部进水的承压井流影响范围不大，井涌的破坏范围更小，据此可区分出有害管涌与无害管涌。前者局限于堤脚附近，小范围压渗为首选方案；对后者，既无需专门防治，更不必追求根治。     

A high-capacity broadband packet switch architecture based on a multilink approach

Broadband packet networks based on asynchronous transfer mode (ATM) are expected to provide a wide range of services, including motion video, voice, data and image. When these networks become prevalent, some applications such as motion video and high-speed LAN interconnections will place a very large bit rate requirement on the channels. Currently, the physical layer supported by the synchronous optical network (SONET) allows the transmission of up to 2.4 Gbit/s with the OC-48 optical interface. However, it is not feasible for the electronic packet switch to route packets at this rate on a single link. In this paper we present a design of a broadband packet switch that uses multiple links in parallel to realize a high-speed channel. This implementation permits the switch to operate at the lower link rate, which can be at 150 Mbit/s, while having the ability to support a virtual circuit at a higher rate (up to 2.4 Gbit/s). The main contribution of the design is that packet sequence on a channel is still maintained even though packets are allowed to use any of the links belonging to the same channel. Besides allowing the switch to function at a slower rate than the transmission channel rate, the implementation of the multilinks benefits from statistical multiplexing gain. Analytical results show the performance advantages of multilink design with respect to delay, throughput and packet loss probability.     

A note on models for non-probabilistic analysis of packet switching networks

We consider two models commonly used in the literature to model adversarial injection of packets into a packet switching network. We establish the relation between these two types of models, and between them and the set of sequences of packets that allow stability. We also consider the adaptive setting in which packets are injected with only their source and destination but without a prescribed path to follow.     

浮选柱处理滇池污水的工艺初探

针对滇池水污染的状况和治理现状，对目前国内采用ICEAS工艺的污水处理厂脱氮除磷效果不佳的现状，此工艺采用浮选柱作为浮选设备，并采用充以臭氧等新的技术，能更有效地解决滇池污水中的氮、磷、有机悬浮物、COD污染物，预计会有很好的研究价值和应用前景。     

一种便于观测的信号抽样及复原方法

利用倍频器，将重复频率与连续信号ｔ（ｔ）的频率相同的方波进行若干次倍频后，对连续信号进行抽样，从而获得离散的抽样信号ｆｓ（ｔ），再利用有源低通滤波器使其复原成连续信号ｆ（ｔ）。避免了一般抽样器不便于观测的缺点。     

PZT铁电薄膜的制备及电学性能研究

使用硝酸锆作锆源的溶胶－凝胶方法制备ＰＺＴ铁电薄膜。他们的电学性能被测试包括电滞回线，电流Ｉ（ｔ）特性，漏电流，矫顽场疲劳和老化。测到的ＰＺＴ薄膜剩余极化８．２μＣ／ｃｍ~２，矫顽场６８ｋＶ／ｃｍ．簿膜的寿命可超过１０~（１１）周期。     

B—ISDN宽带UNI信令点到多点配置的实现

本文根据ＩＴＵ－Ｔ最新的Ｑ．２９７１协议，以及笔者所从事的实际课题，提出一整套Ｂ－ＩＳＤＮ第三层ＵＮＩ信令的软件实现策略，其特点是能同时满足用户对点到点以及点到多点广播这两种通信方式的要求，而且可以动态配置。     

ATM技术浅析

网络通信技术正在迅猛地发展，各种各样的高速通信技术如雨后春笋，其中ＡＴＭ作为一种信元换技术，具有以兆或千兆级速率传送话音、数据和图象的能力，它在网络通信技术中占有特别重要的地位。本文介绍了ＡＴＭ技术的产生、基本特点、体系结构、在ＢＩＳＤＮ中的作用、存在的问题以及发展前景。     

补偿式光纤双法布里－珀罗微位移测量系统

本文提出一种能补偿环境影响的,插入光纤传光介质的新型微位移测量系统和灵敏度阈的实验结果.由于采用平行双通道的结构,系统具有高精度、抗干扰的补偿法特点.该系统适合于微位移(纳米级)测量,可用于检定其它高精度位移传感器,几何量计量中定位,微细加工表面轮廓测量以及可以转换成微位移量或光程差的其它物理量测量中.