用动态均衡法估算果树耗水量的研究

本文运用土壤水势能理论,研究了柑树根区土壤水分交换,从动态角度探讨了土壤水分储量的变化、水量均衡,从而建立了由土壤负压资料推算果树耗水量的通用模型——动态均衡法。初步研究表明,动态均衡法相对传统的水量平衡法。考虑的水量均衡要素更全面,计算结果更接近实际。     

转子分布不平衡和轴承特性参数同时辨识方法

针对转子模态动平衡的关键参数转子不平衡量和轴承特性参数难以确定的问题,提出一种基于轴承处振动响应的轴承特性参数和转子分布不平衡参数的同时辨识方法。以多项式函数描述转子质量偏心曲线,表征转子连续分布的不平衡质量;以有限元法建立转子/轴承子结构运动微分方程;采用虚功原理将连续分布的广义不平衡力转化为节点处的集中不平衡力并建立其与偏心曲线系数的关系,从而推导出轴承特性参数及质量偏心曲线系数的同时辨识方程,进而实现基于不同转速下轴承处的振动响应辨识出轴承特性参数和分布不平衡参数。以一个转子轴承系统为例进行了偏心曲线阶次对参数辨识的敏感度仿真,结果表明：偏心曲线阶次对参数辨识结果影响较小。以实测轴承处响应辨识得到的参数进行一阶模态动平衡实验,平衡后轴承处振动明显降低,验证了提出的辨识方法及其在模态动平衡中的有效性。     

基于分数阶Fourier变换的宽带干扰识别方法

宽带压制性干扰是直接序列扩频系统面临的主要干扰威胁之一,对宽带干扰样式的识别与参数估计可为直扩通信双方采取有针对性的抗干扰措施提供有益参考。针对直扩系统常见的宽带干扰类型,通过提取5个特征参数值,提出了一种基于分数阶Fourier变换和分层决策分类算法的宽带干扰样式自动识别方法,并给出了仿真结果及其分析。仿真结果表明,该方法可以有效识别无干扰、窄带干扰、宽带噪声干扰、宽带梳状谱干扰和宽带线扫频干扰情况,具有识别率高、算法简单、信号采样时长短、稳定性和鲁棒性好等优点。     

使用法布里─珀洛腔作为波长控制器件的WDM系统波长控制精度的计算

在光纤WDM通信系统或WDM网络中，波长控制是十分必要的.本文讨论了使用法布里-珀洛（FP）谐振腔作为波长控制器件，在考虑频道间串扰的情况下，波长控制精度的计算理论，对一个频道间隔200GHz，16路信道，调制码率为2.488Gb／s的WDM系统的波长控制精度问题进行了计算和比较.     

Fuzzy Least-Congested Path Routing and Improved Remote-Path Routing based on Hierarchical Information in WDM Networks

Although routing schemes based on global knowledge make most optimal routing decisions, they will occupy many resources to keep the state information of the network up-to-date. In this work, we describe a fuzzy least-congested path (FLCP) routing algorithm based on hierarchical information. Simulation shows that the blocking probability using FLCP is very near to the blocking probability using the least-congested path routing (LCP) algorithm based on global information. Under heavy traffic load, the FLCP algorithm is superior to the exhaustive algorithm (EA) and the LCP algorithm with unit information cost. The FLCP algorithm provides better routing, even with incomplete information. Thus, the algorithm requires less information of the network, particularly under heavy traffic load. In addition, an improved remote-path routing approach is provided to reduce the blocking probability of connection requests to a node that is many hops away from the source node.     

全光网中一种功率控制和均衡方案的研究

针对全光网中级联ＥＤＦＡ的功率瞬态变化的情况，提出了一 析的功率均稀和控制方案。     

在线光纤放大器远程监控方案的研究

研究了一个监控信道方案，用于ＷＤＭ＋ＥＤＦＡ光纤通信系统在线光纤放大器远程监控，并成功地实现了其演示系统，对该方案的实行性进行了论证。     

4×155Mb／s频分复用（FDM）光纤通信系统的研究

报道了一个无故障工作时间大于２４小时的四路１５５Ｍｂ／ｓ频分复用（ＦＤＭ）光纤通信系统，实测系统误码率优于０×１０（－１４）。系统接收机包括解复用光滤波器，接收机灵敏度优于－３０ｄＢｍ（ＢＥＲ＝１×１０（－９），频道间距为０．１ｎｍ，四路ＦＤＭ信号－２０ｄＢ的总谱宽为０．７ｎｍ。系统采用国产ＤＦＢ激光器为光源，实际光纤传输距离１８ｋｍ。系统全部实现了脱离光学平台的模块化结构，在长期的系统实验中显示了优良的稳定性。这一成果为ＦＤＭ在光纤传输接入网中的进一步实用化开发铺平了道路。     

A theory of complex open resonators in the form of cavity chain

Journal of Infrared, Millimeter, and Terahertz Waves - The previous theory ((2,6)) of microwave open resonators has been improved, which can be applicable not only to simple cavities, but also to...     

Rotation sensing based on a slow-light resonating structure with high group dispersion

The concept of the Sagnac effect in a slow-light medium and resonator structure with a high group dispersion is investigated. It is found that a slow-light medium can be utilized for relative motion sensing, and a slow-light resonator structure is suitable to detect absolute rotation for navigation purposes. It is noted that the high group dispersion leads to a huge enhancement of the rotation sensor's sensitivity in a resonating structure, and an approach to evaluate and design resonator devices with slow-light property is proposed. Moreover, a folded loop-lattice-based structure is numerically simulated to verify the concept.