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Chen Wencheng Huang Zheng Guo Liping Lin Yandan Chen Dahua 《Tunnelling and Underground Space Technology incorporating Trenchless Technology Research》2008,23(2):139-144
The characteristics and performance of two tunnel lighting systems are investigated in this paper. Tunnel No. 1 is installed with induction electrodeless fluorescent lamps and tunnel No. 2 is installed with high pressure sodium (HPS) lamps. The luminance levels and illuminating uniformity with two systems were measured and analyzed. The spectrum and energy cost have also been studied. Additionally, the responses of drivers were investigated. By the comparison of these two tunnel lighting systems, it was found that the tunnel lighting system with induction lamps shows advantages in high brightness perception to drivers, good color rendering, higher uniformity, better safety perception to drivers and low energy cost over the tunnel lighting system with HPS lamps. 相似文献
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以高性能钢HPS485W、HPS690W及高强混凝土C60、C70为主要研究材料,对高性能钢-高强混凝土组合梁进行弹性和塑性分析;通过简支组合梁的实例,分别计算各组不同截面不同材料组合梁的屈服弯矩和极限弯矩,发现高性能钢-高强混凝土组合梁的抗弯承载力比普通组合梁大大提高;另外运用有限元软件ANSYS模拟上述实例中的各组组合梁,并将有限元数值模拟结果与理论计算结果相比较,以验证其正确性和合理性。 相似文献
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D. Fernández-González I. Ruiz-Bustinza J. Mochón C. González-Gasca L. F. Verdeja 《Mineral Processing and Extractive Metallurgy Review》2017,38(4):215-227
Sintering is a thermal agglomeration process that is applied to a mixture of iron ore fines, recycled ironmaking products, fluxes, slag-forming agents, and solid fuel (coke). The purpose of the sintering process is manufacturing a product with the suitable characteristics (thermal, mechanical, physical and chemical) to be fed to the blast furnace. The process has been widely studied and researched in the iron and steelmaking industry to know the best parameters that allow one to obtain the best sinter quality. The present article reviews the sintering process that the mixture follows, once granulated, when it is loaded onto the sinter strand. There, the sinter mixture is partially melted at a temperature between 1300-1480°C and undergoes a series of reactions that forms the sinter cake to be loaded into the blast furnace to produce pig iron. 相似文献
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可调光节能的数字化高压钠灯电子镇流器设计 总被引:1,自引:0,他引:1
设计了一种具有调光节能功能的电子镇流器,该电子镇流器包括有源功率因数校正电路(APFC),半桥逆变电路和控制系统。对系统的参数进行了设计和实验。实验结果表明,与传统的电子镇流器相比,所设计的电子镇流器具有更好的启动、运行性能。可以方便的实现调光,节能效果明显,具有较好的应用价值。 相似文献
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隧道湿喷纤维高性能混凝土单层永久衬砌研究 总被引:8,自引:4,他引:8
针对复合式衬砌在施工、承载和防水方面存在的问题,按照挪威隧道工法(NMT)的原理和技术要求,以昆石(昆明-石林)高速公路小团山隧道为工程实例,从结构设计、抗渗性、耐久性、经济性和施工技术等方面系统地研究了隧道湿喷纤维高性能混凝土单层永久衬砌技术,并在小团山隧道施作了30m长的C45湿喷纤维高性能混凝土单层永久衬砌代替原设计的复合式衬砌。小团山隧道工程实践证明,湿喷纤维高性能混凝土单层永久衬砌代替复合式衬砌,变被动防水为主动防水,防水效果良好;同时,工程量小,施工速度快,节约造价。 相似文献
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