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1.
钢管混凝土框架钢筋贯通式刚性节点的实验研究 总被引:5,自引:0,他引:5
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。 相似文献
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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。 相似文献
3.
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. 相似文献
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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。 相似文献
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《中国炼油与石油化工》2014,(2):70-70
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- 相似文献
8.
《中国炼油与石油化工》2014,(2):19-19
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. 相似文献
9.
《中国炼油与石油化工》2014,(3):98-98
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 相似文献