防止主变压器差动保护误动一例

结合一起未遂事故,详细分析了主变差动保护在桥式接线时的CT二次接线原则和差动保护原理,同时指出了某些情况下系统穿越电流也可能成为差动电流的事实,并对类似的多种危险情况提出了防范措施。     

Chemical–mechanical pretreatment of wood: Reducing downsizing energy and increasing enzymatic digestibility

A chemimechanical (CM) pretreatment method was devised, wherein wood chips are acid-treated to weaken the physical structure then disc-refined to produce a fibrous substrate. CM pretreatment was directly compared with a common dilute acid (DA) pretreatment method, wherein wood is mechanically downsized to a powder or fiber substrate and then acid-treated. It was hypothesized that the CM pretreatment sequence would reduce the energy required for size reduction and increase enzymatic digestibility of the pretreated substrate. By treating wood chips in a dilute sulfuric acid liquor before the mechanical downsizing step, the net specific energy (NSE) of disc-refining was reduced by up to 95%. At the optimal acid treatment and disc-refining conditions determined within this work, CM pretreatment could produce a highly digestible lignocellulose substrate (95% cellulose conversion) while requiring less than 100 kWh/tonne od NSE for mechanical downsizing. A comparison of CM and DA pretreated hardwood revealed that CM pretreatment produced a significantly more digestible substrate than DA pretreatment. Differences in the digestibility of CM and DA pretreated substrates were attributed to differences in physical structure. CM pretreatment produced a substrate that consisted primarily of single fibers and small fiber bundles, while DA pretreatment produced larger fiber bundles. Furthermore, the CM pretreated substrate had a more accessible pore structure, and an altered distribution of surface lignin.     

MANET中基于移动代理拓扑发现的策略及其仿真

在MANET环境下,讨论了基于多个移动代理的拓扑发现方案。方案的核心在于通过链路关联度来反映网络的拓扑状况,以移动代理的历史路径和节点信息新鲜度来决定移动代理的漫游策略,仿真实验表明:该算法能够在较短的时间内达到收敛状态,同时给出了节点和代理的最优比例。     

客运专线铁路隧道混凝土设计中存在的不足及解决方法

混凝土的电通量与水灰比（强度）存在直接关系，但在某些客运专线铁路隧道设计中，混凝土的电通量指标与强度指标不相对应。根据现今的材料尤其是减水剂性能大幅提高的情况，建议在今后的隧道设计中较大幅度地提高混凝土强度等级。在结构物达到相同承载能力时，混凝土强度等级的提高可以减少混凝土用量、节约砂石等材料，同时义可以减少相当大的工作量。     

钢管混凝土框架钢筋贯通式刚性节点的实验研究

深圳市邮电信息枢纽中心大厦工程中,钢管混凝土框架的梁柱节点,采用了钢筋贯通式刚接节点。介绍了开圆孔和开长圆孔的节点的构造和模型试验结果,提出了设计计算方法和要求,实验结果表明这种节点满足刚接节点要求,开长圆孔节点应加设箍筋,以提高节点的整体性和刚度。     

潮州供水枢纽船闸设计

通过本文设计,确定潮州供水枢纽船闸的船闸布置及行运方式,使船闸各部位的功能及尺寸满足船闸设计规范的要求。     

“Packaged Technology of 120 kt/a Energy-Saving Styrene Unit” and Other Three Styrene Related Projects Passed Review and Appraisal

正On December 10,2013"The packaged technology of120 kt/a energy-saving styrene unit"and other three styrene related projects jointly undertaken by the SINOPEC Shanghai Petrochemical Research Institute and other relevant institutions had passed the review and appraisal organized by the SINOPEC Science and Technology Division.Upon submittal of proposal for working out the pack-     

The Project “Research and Development of Monocrystalline Multi-interstitial HTS-3 Zeolite Catalyst” Passed Technical Appraisal of Sinopec Corp

正On January 26,2014 the project"Research and development of monocrystalline multi-interstitial HTS-3 zeolite catalyst"jointly undertaken by RIPP and Sinopec’s Catalyst Branch Company has passed the technical appraisal sponsored by the Science and Technology Division of the Sinopec Corp.     

Novel Methanol-to-Propylene Technology Passed theSINOPEC＇s Review

正On July 7,2014 the project covering the enlarged-scale pilot test and commercial sideline test of the MTP catalyst and PDP of the 1.8 Mt/a SMTP packaged technology,jointly undertaken by the SINOPEC’s Shanghai Petrochemical Research Institute and its cooperative institutions,had passed the review organized by the SINOPEC     

基于龙芯处理器的网络防火墙系统的设计与实现

设计并实现了一个网络防火墙计算机系统方案。该方案采用国产高性能龙芯2E处理器和Linux操作系统,并对防火墙系统软件的核心策略、硬件结构设计、高速信号完整性设计、网络数据包吞吐率和延时的测试方法等关键问题给出了相应的解决方法。针对信号完整性问题提出了先期约束后期仿真的布线机制,提高了高速信号系统板级设计的可靠性。给出了网口数据包吞吐率和延迟这两项评估防火墙性能的关键指标的测量和计算方法。板级仿真和实际网络性能测试数据表明,该方案是一个通用且安全可靠的防火墙系统方案。