全光网络的安全性探讨

全光网络通过波长路由为用户提供一个透明的光路,因此带来了许多安全性问题。袭击者往往根据全光网的弱点进行业务干扰和分光窃取信号。文章主要探讨了与全光网络的光层有关的安全管理问题。在对全光网络的安全特征进行分析的基础上,介绍了全光网可能遭到的恶意攻击的3种方式。针对不同的攻击方式提出了一些解决办法,并对这些方法的优缺点作了分析比较

State Ownership,Performance Measurement Diversity,and Corporate Performance:Evidence from Enterprises in China

【中文摘要】现代企业业绩评价系统理论强调运用非财务指标补充传统的财务业绩指标，以减少管理者的短期行为。按照平衡计分卡的基本思想，综合业绩指标体系更有利于实现企业的价值最大化目标。本文基于代理理论，在中国制度环境下运用问卷调查数据实证检验评价指标多元化对企业绩效的影响。研究发现，评价指标多元化能够有效改善企业绩效，且对非国有企业财务绩效的改善程度更高。本文的研究结论可以为我国企业绩效管理实践提供理论指导和管理启示。 【Abstract】The modern performance measurement system theory suggests that nonfinancial measures can be used to supplement the traditional financial measures so as to restrict the short-term behaviors of managers. According to the basic idea of balanced score card，the comprehensive performance measurement system is more beneficial to achieve the maximum value of an enterprise. In addition， this paper empirically examines the effect of performance measurement diversity on corporate performance using the survey data in Chinese institutional environments.This study finds that performance measurement diversity is able to effectively improve the enterprise perfotmance，in particular，improves the financial performance of non-state-owned enterprises more than that of state-owned ones. Lastly，this paper provides essential theoretical guidance and practical implementation for the performance management in Chinese enterprises.国家自然科学基金项目“管理会计报告决策价值及其作用机理研究——基于呈报格式、任务特征和决策者认知”(71172228)、教育部新世纪优秀人才支持计划(NCET-09-0658

基于氮化镓的导模共振滤波器仿真分析

根据严格耦合波理论和等效介质理论,提出了针对C波段、基于半导体材料氮化镓的亚波长导模共振滤波器结构及设计方法。详细探讨了在强调制光栅的高占空比作用下,光栅周期和入射波角度对滤波器反射谱共振波长的影响。在保持滤波效果为高衍射率（共振波长峰值反射率达到99.5%以上）、低旁带和窄线宽的条件下,利用其对入射波角度的敏感性,结合仿真数值提出了一种通过MEMS（微机电系统）平面反射镜调谐入射角角度（04.07°）,从而线性地控制共振波长输出（调谐范围为36nm）,实现峰值半宽高低于0.8nm的C波段可调滤波器

Silicon Silver Composite Materials for Li-ion Batteries

应用机械合金化法制备了两种不同组分的Si-Ag复合材料.扫描电镜(SEM)、X射线衍射(XRD)、充放电测试和循环伏安法对该材料的微观形貌、相组成及电化学性能.研究表明,组成原子比为1∶1的复合材料具有很好的循环稳定性和可逆性,在0.2mA·cm-2的电流密度下,经50周循环后可逆容量仍保持300mAh·g-1.实验发现,借助充放电控制,即可有效提高合金材料的循环性能.Si-Ag composite materials were prepared by mechanical alloying method. The morphology and composition of SiAg composites were investigated by SEM and XRD. The electrochemical properties of the composites were determined by charge-discharge tests and cyclic voltammetry. The composite composed of Si∶Ag with an atomic ratio of 1∶1 (sample 1#) showed good cyclic stability and charge-discharge reversibility. The reversible capacity of the composite (sample 1#) was remained over 300 mAh·g-1 after 50 cycles. Experimental results showed that controlling the potential range of charge-discharge processes could enhance the cyclic performance of alloy materials.作者联系地址：浙江工业大学化学工程与材料学院,绿色化学合成技术国家重点实验室培育基地;Author's Address: State Key Lab Breeding Base of Green Chemistry-Synthesis Techology,College of Chemical Engineeringand Materials Science,Zhejiang Univ. Tech.,Hangzhou 310014,Chin