共查询到19条相似文献,搜索用时 203 毫秒
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CA—CA2—C2AS—MgO系统中C2AS转为为Q相的研究 总被引:3,自引:0,他引:3
本文研究了1300℃下CA-CA2-C2AS-MgO系统中C2AS转化为Q相的条件,结果表明,在CA-CA2-C2AS-MgO系统中的C2AS只有补钙的条件下才能转化为Q相,转化后的矿物组成为CA-C12A7-Q-MgO。 相似文献
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本文研究外加少量MgO和对Q相-CA-C12A7-MgO系列水泥烧成的影响。实验表明:加入少量的MgO能够促进Q相的烧成,在Q相-CA-C12A7-MgO系统水泥的生料中含有少量的Fe2O3会降低Q相的形成量,而加入少量的Fe2O3同时加入少量的MgO,则能够促进Q相的形成。 相似文献
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本文研究了Q相-C4AF-C2S系统中各相的共存条件。当在Q相生料中加入少量C4AF时,会降低Q相的形成温度。但是在高温下由于Mg2+在C4AF中的固溶,大量的C4AF加入时反而不利于Q相形成。这时需要在Q相-C4AF生料中加入适量MgO。对于Q-C4AF-C2S-C12A7系统,当碱度系数≥1时,Q相、C4AF、C12A7和C2S可在较大范围内共存 相似文献
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微量的MgO和Fe2O3对Q相—CA—C12A7—MgO系水泥的影响 总被引:2,自引:0,他引:2
本文研究外加少量MgO和对Q相-CA-CA12A7-MgO系列水泥烧成的影响,实验表明:加入少量的MgO能够促进Q相的烧成,在Q相-CA-C12A7-MgO系统水泥的生物中含有少量的Fe2O3降低Q相的形成量,而加入少量的Fe2O3同时加入少量的MgO则能够促进Q相的形成。 相似文献
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本文研究了Q相-C2S配合料中V2O5对β-C2S的稳定性问题,结果表明,微量V2O5可以稳定β-C2S,使Q相与β-C2S可在常温下共存;Q相-C2S配合料中V2O5/C2S在0.8~1.0%的范围内V2O5稳定β-C2S的效果最好。 相似文献
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本文研究了Q相-C4AF-C2S系统中各相的共存条件。当在Q相和一料中加入少量C4AF时,会降低Q相的形成温度。但是在高温下由于Mg^2+在C4AF中固溶,大量的C4AF加入时反而不利于Q相形成。 相似文献
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ZnO-MgO-Al2O3陶瓷是一种复合烧结体,其主晶相为ZnO与ZnAl2O4,且均以晶粒存在。MgO能调节电阻温度系数,使之由负变为正。Al2O3能调节电阻率。慢的降温速度能提高线性及耐浪涌能量,降低电阻温度系数。 相似文献
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通过CA溶液、PAN溶液及两者共混溶液的凝胶固化过程的显微摄影及聚合物-溶剂-沉淀剂的三元相图,揭示了CA-PAN-DMAc溶液的相转变特性及影响共混膜结构和性能的内在因素。结果表明,共混溶液中,CA和PAN以不同的速度发生相转变,由于CA和PAN间的相互作用,使膜断面呈现指状结构和不对称网络结构;相转变点受温度及共混比等条件的影响,膜断面形态亦相应变化;共混膜的水通量和平均孔径均大于纯组分。 相似文献
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采用超声波真空浸渍-碳热还原法将ZrB2引入碳纤维预置体,结合热梯度化学气相渗透、高温石墨化工艺制备了ZrB2改性C/C复合材料.氧-乙炔烧蚀测试结果表明,添加了6.87 wt%ZrB2后,C/C复合材料的线烧蚀率和质量烧蚀率分别下降了64.9%和67.5%.分析表明,C/C复合材料的烧蚀主要是由热化学和热物理反应控制,机械剥蚀在烧蚀过程中仅起到次要作用.烧蚀产物ZrO2/B2O3在烧蚀过程中的挥发会带走大量的热,从而减少了烧蚀火焰对烧蚀表面的热冲击. 相似文献
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对美国Hercules公司的AS4碳纤维的常规性能及其环氧复合材料性能进行了研究,认为AS4性能基本上与国内应用较广的T300碳纤维性能相当。有较大的推广使用价值。 相似文献
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在对作业方式、出入库作业方式分析的基础上,开发出了自动化立体仓库的出入库决策系统.系统管理层用Visual Basic 6.0编程语言开发,可实现对系统参数的初始设置,记录和查询出入库信息,货位优化管理和堆垛机的优化调度.监控仿真层的开发选用了组态软件组态王6.5,可实现对立体仓库的输入输出作业过程的动态模拟,并对系统运行结果进行曲线分析.系统数据库平台的构建选用的是Access 2000数据库软件,该数据库平台为管理层和监控层搭建了数据桥梁.进行货位优化管理时要综合考虑分布描述指标、库存量指标、出库分发效率指标这三个指标;按照堆垛机作业路线的优先级来安排堆垛机作业指令;综合考虑货位管理、堆垛机调度和输送机的运送管理这三个问题.通过仿真试验证明了可以得到系统进行优化决策方案. 相似文献
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Yujie Li Lei Ding Shujun Yin Zhangqian Liang Yanjun Xue Xinzhen Wang Hongzhi Cui Jian Tian 《纳微快报(英文)》2020,(1):63-74
The biggest challenging issue in photocatalysis is efficient separation of the photoinduced carriers and the aggregation of photoexcited electrons on photocatalyst’s surface.In this paper,we report that double metallic co-catalysts Ti3C2 MXene and metallic octahedral(1T)phase tungsten disulfide(WS2)act pathways transferring photoexcited electrons in assisting the photocatalytic H2 evolution.TiO2 nanosheets were in situ grown on highly conductive Ti3C2 MXenes and 1T-WS2 nanoparticles were then uniformly distributed on TiO2@Ti3C2 composite.Thus,a distinctive 1T-WS2@TiO2@Ti3C2 composite with double metallic co-catalysts was achieved,and the content of 1T phase reaches 73%.The photocatalytic H2 evolution performance of 1T-WS2@TiO2@Ti3C2 composite with an optimized 15 wt%WS2 ratio is nearly 50 times higher than that of TiO2 nanosheets because of conductive Ti3C2 MXene and 1T-WS2 resulting in the increase of electron transfer efficiency.Besides,the 1T-WS2 on the surface of TiO2@Ti3C2 composite enhances the Brunauer–Emmett–Teller surface area and boosts the density of active site. 相似文献
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Double-deep multi-aisle automated storage/retrieval systems are increasingly applied for storing and retrieving unit loads, with advantages of increased space utilisation, reduced number of aisles and improved efficiency of storage rack (S/R) machines. In such systems, the retrieval process may consist of the rearrangement of blocking loads, based on the assumptions of uniformly distributed storage locations and random storage policy. We formulate analytical travel-time models of both single- and dual-command cycles under three rearrangement rules. We validate the analytical travel-time models by simulation and conduct numerical experiments to analyse the effect of the number of aisles an S/R machine serves, the fill-grade factor and the command cycles on the expected travel time of the S/R machine. The results show that the expected travel time of the S/R machine is increasing with the increase in the number of aisles an S/R machine serves and the increase in the fill-grade factor, and dual command cycle outperforms single-command cycle in terms of cycle time. To deal with the trade-off between the storage space cost and the operational cost of the S/R machine, we develop a decision model for finding an optimal fill-grade factor to minimise the total cost. We find the condition when an optimal fill-grade factor exists and show how to calculate it. Based on the decision model, we compare the performance of double-deep multi-aisle automated storage/retrieval system (AS/RSs) and single-deep single-aisle AS/RSs. The results show that double-deep multi-aisle AS/RSs outperform single-deep single-aisle AS/RSs in terms of total cost, although double-deep multi-aisle AS/RSs need more storage locations. 相似文献