随着电力调度脉冲编码调制(PCM)设备的逐步退运,电网公司将逐步采用光传输设备替代调度PCM设备。在设备更换的过渡期,存在大量光传输设备与PCM设备混用的情况。为解决电力调度传输网络中存在的E1与互联网协议(IP)分组业务转换难度大、...随着电力调度脉冲编码调制(PCM)设备的逐步退运,电网公司将逐步采用光传输设备替代调度PCM设备。在设备更换的过渡期,存在大量光传输设备与PCM设备混用的情况。为解决电力调度传输网络中存在的E1与互联网协议(IP)分组业务转换难度大、转换速率低的问题,提出了1种基于网络切片的IP over E1方法。首先,将要传输的数据打包成IP数据。然后,基于网络切片技术,将IP数据包切片后,封装成E1帧。在此基础上,通过E1链路进行数据传输,在接收端通过E1数据帧拆解完成IP数据包的重组发送。最后,将所提方法在某省电力公司进行实例运行,IP over E1转换准确率为99.86%。其结果验证了该方法的有效性。该方法可有效提高IP over E1转换速度和准确率。展开更多
The encapsulation of stearic acid coated nanometer CaCO3 by a polystyrene (PS) network via emulsion polymerization is described, where gamma-methacryloxypropyltrimethoxysilane (MPS) was used as an efficient crosslinke...The encapsulation of stearic acid coated nanometer CaCO3 by a polystyrene (PS) network via emulsion polymerization is described, where gamma-methacryloxypropyltrimethoxysilane (MPS) was used as an efficient crosslinker. The important factors such as the type and amount of surfactant and initiator and the content of CaCO3 are investigated as well as the role of MPS. It has been shown that little PS was extractable with only 0.6 wt% of MPS (relative to styrene). The cationic surfactant cetyl trimethylammonium bromide (CTAB) proved more effective than the anionic surfactant sodium dodecyl sulfonate (SDS). The yield rises, particles become smaller and size distribution broadens with increased amount of CTAB. It is also found that either 2,2'-azobis(isobutyronitrile) (AIBN) or ammonium persulfate (APS) is suitable for attaining high monomer conversion. With increased amount of CaCO3, the encapsulation ratio can be varied from 17.9 to 3.6, while monomer conversion and yield decrease slightly. FT-IR spectra of the products after extraction indicate tight encapsulation between PS and CaCO3, and TEM photographs of composite particles with well-defined core-shell structure give direct evidence of encapsulation.展开更多
通过比较主动网络工作组研究的ANEP主动包协议与Wetherall等人提出的Active IP Option主动包协议,提出了能结合两者优越性的主动包封装格式;在主动网络分布式代码存储基础上,为最少改动传统网络结构且更快部署新的协议和应用,提出了将...通过比较主动网络工作组研究的ANEP主动包协议与Wetherall等人提出的Active IP Option主动包协议,提出了能结合两者优越性的主动包封装格式;在主动网络分布式代码存储基础上,为最少改动传统网络结构且更快部署新的协议和应用,提出了将代码服务器和域名服务器合二为一,且主动代码的命名方式与计算机域名命名方式一致;最后,提出了新的主动节点和代码服务器缓存中主动代码淘汰算法。展开更多
文摘随着电力调度脉冲编码调制(PCM)设备的逐步退运,电网公司将逐步采用光传输设备替代调度PCM设备。在设备更换的过渡期,存在大量光传输设备与PCM设备混用的情况。为解决电力调度传输网络中存在的E1与互联网协议(IP)分组业务转换难度大、转换速率低的问题,提出了1种基于网络切片的IP over E1方法。首先,将要传输的数据打包成IP数据。然后,基于网络切片技术,将IP数据包切片后,封装成E1帧。在此基础上,通过E1链路进行数据传输,在接收端通过E1数据帧拆解完成IP数据包的重组发送。最后,将所提方法在某省电力公司进行实例运行,IP over E1转换准确率为99.86%。其结果验证了该方法的有效性。该方法可有效提高IP over E1转换速度和准确率。
基金Supported by the National Natural Science Foundation of China under Grant(60973112)Program for New Century Excellent Talents in University(NCET-11-0565)Fundamental Research Funds for the Central Universities under Grant(2011JBM221)~~
文摘The encapsulation of stearic acid coated nanometer CaCO3 by a polystyrene (PS) network via emulsion polymerization is described, where gamma-methacryloxypropyltrimethoxysilane (MPS) was used as an efficient crosslinker. The important factors such as the type and amount of surfactant and initiator and the content of CaCO3 are investigated as well as the role of MPS. It has been shown that little PS was extractable with only 0.6 wt% of MPS (relative to styrene). The cationic surfactant cetyl trimethylammonium bromide (CTAB) proved more effective than the anionic surfactant sodium dodecyl sulfonate (SDS). The yield rises, particles become smaller and size distribution broadens with increased amount of CTAB. It is also found that either 2,2'-azobis(isobutyronitrile) (AIBN) or ammonium persulfate (APS) is suitable for attaining high monomer conversion. With increased amount of CaCO3, the encapsulation ratio can be varied from 17.9 to 3.6, while monomer conversion and yield decrease slightly. FT-IR spectra of the products after extraction indicate tight encapsulation between PS and CaCO3, and TEM photographs of composite particles with well-defined core-shell structure give direct evidence of encapsulation.
文摘通过比较主动网络工作组研究的ANEP主动包协议与Wetherall等人提出的Active IP Option主动包协议,提出了能结合两者优越性的主动包封装格式;在主动网络分布式代码存储基础上,为最少改动传统网络结构且更快部署新的协议和应用,提出了将代码服务器和域名服务器合二为一,且主动代码的命名方式与计算机域名命名方式一致;最后,提出了新的主动节点和代码服务器缓存中主动代码淘汰算法。
