Study on a Distributed Wavelength Routing Algorithm in WDM Optical Transport Networks

A new design scheme for a distributed algorithm for routing and wavelength assignment (RWA) is developed in this paper, and the communication rules between the nodes to exchange signaling packets are discussed. The Adaptive-Alternate-Routing-Least-Load (AARLL) algorithm is implemented in the distributed scheme for the first time. Under dynamic traffic circumstances, the influence of the race condition, which does not exist in centralized scheme, on the network performance is analyzed and the analyzed results show that the race condition has a major impact on network performance only under light traffic load, while under medium and heavy traffic load the impact is very small. To analyze the performance loss caused by adopting the distributed algorithm for RWA, the capacity loss factor (CLF) is introduced and the calculated results show that CLF does not exceed 6% under medium traffic load.     

天然气长输管道事故及应对措施

分析了天然气管道发生泄漏、爆管等事故的原因，提出了相应的预防措施。     

从延异与踪迹再谈解构主义与翻译实践

解析德里达创造的“延异”和“踪迹运动”等术语,探讨解构主义为翻译实践所提供的诸多可能性以及德里达对翻译实践的贡献。     

基于VPN的株洲某污水泵站远程监控系统的设计与实现

为顺应系统远程监控的发展趋势,以株洲某污水泵站为背景工程,分析了该泵站和上位机的系统配置,并采用虚拟专用网(VPN)技术,把PLC工业控制和远程通讯结合起来,实现了该远程控制系统。同时介绍了VPN网络的定义及其技术特点,阐述了整个系统的结构及VPN网络在其中的关键作用。现场运行情况证明了该方案具有较强的可行性。     

区块链环境下基于秘密共享的数字权限管理方案

针对数字权限保护中对内容加密密钥的安全保存和有效分发的需求,提出了一个区块链环境下基于秘密共享的数字权限保护方案。该方案主要包括系统初始化、内容加密、许可授权和内容解密4个协议。在该方案中,利用Pedersen可验证秘密共享方案和属性基加密（ABE）算法来实现内容加密密钥的保护和分发,将内容提供商从管理内容加密密钥的任务中解放出来,从而确保了密钥管理的安全性和灵活性。此外,基于区块链的数字权限保护方案具有信息公开透明、不可篡改等特点。安全性分析表明,该方案在区块链环境下是安全可行的;仿真实验结果表明,该方案能够以较低的开销实现数字内容的权限保护。     

多服务器数据流的模糊控制

讨论了离散排序系统中3个不同服务率的服务器数据流的模糊控制问题.通过把数据动态地分配到空闲的服务器中去,从而实现了顾客的平均逗留时间最小的目标.仿真结果表明了该控制器的有效性.     

韘形佩的历史渊源及演变——以海昏侯墓出土龙凤纹韘形佩为例

考古工作者近日于江西南昌海昏侯墓发掘出土了一枚通体白色的龙凤纹玉佩,形制属韘形佩。这件玉佩饰的质地上乘,在2000多年后的今天仍看不出些许钙化的痕迹,高、浅浮雕以及镂雕、透雕工艺的运用堪称汉玉的最高水平。在对此枚玉佩的分析基础上,从形制、纹饰等方面探讨了韘形佩的演变过程,并阐明这一演变过程发生的原因及其所反映的不同背景下的社会精神内涵。     

Synthesis and adhesion properties of waterborne polyurethane dispersions with long‐branched aliphatic chains

In this study, a series of waterborne polyurethanes (WPUs) with different contents of long‐branched aliphatic chains were synthesized through variation of the amount of diol chain extender trimethylol propane monooleate (TMPM). The effects of the TMPM content on the adhesion properties of the WPUs were investigated in terms of their surface tension, interfacial tension, contact angle, and adhesion strength. Fourier transform infrared and ¹H‐NMR spectra demonstrated the successful incorporation of TMPM into the polyurethanes. An increase in the TMPM content produced decreases in the surface tension of the WPUs and the interfacial tension and contact angle between the WPUs and plastic films. This indicated that the wetting properties of the WPUs on the plastic films was improved. The improved wettability enhanced the adhesion strength of the WPUs, and this showed that the long‐branched aliphatic chains could effectively improve the adhesion performance of the WPUs on the plastic films. Moreover, TMPM, with its hydrophobic aliphatic chains, increased the hydrophobicity and thermal stability of the WPU films. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 41688.     

大树移栽管理技术在园林绿化工程中的运用

本文对大树移植管理的意义、养护的特点、移植前的准备和处理、移植过程中的操作流程以及移植后的管理养护进行了详细阐述,为城市中园林绿化工程的大树移植管理提供了参考和指导。     

The role of conductive pathways in the conductivity and rheological behavior of poly(methyl methacrylate)–graphite composites

Up to now, research on the dynamic process of conductive network formation has tended to focus on composite particles with one‐dimensional geometry, such as carbon black and carbon nanotubes. However, studies on this subject based on fillers with two‐dimensional structure, such as graphite, are rare in the literature. In this work, the dynamic percolation and rheological properties of poly(methyl methacrylate) (PMMA)–graphite composites under an electric field were investigated. The activation energies of conductive network formation and polymer matrix mobility were calculated from the temperature dependence of the percolation time and the zero‐shear viscosity. It was found that the activation energy calculated from the zero‐shear viscosity was not influenced by the electric field in the concentration range investigated, but the electric field had an effect on the activation energy calculated from the percolation time. This finding emphasizes that the electrical and rheological properties have different physical origins. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 43810.