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of the largest producers and consumers of lead and zinc in the world. The cumulative productions and emissions of lead and zinc from mining-related activities in China were estimated. Up to 2007, the cumulative productions of lead and zinc in China were estimated to be about 6.69 and 12.59 Mt, respectively; and about 1.62 Mt lead and 3.32 Mt zinc emitted into the ambient environment during the mining......
Train vibration response and cumulative deformation of double arch tunnel in Kast foundation LEI Mingfeng1, PENG Limin1, 2, SHI Chenghua1, 2, DING Zude1, ZHAI Xudong3 (1. School of Civil Engineering... was analyzed. The calculating method of the cumulative deformation of Kast foundation under long-term train loading was discussed further based on Dingqing Li plastic strain model. The results show......
the cumulative vehicle curve. Delays in three cases were modeled and compared: NM-vehicle priorities and M-vehicle priorities with all-red intervals unable to release all vehicles, and longer all-red...; marginal delay; mixed traffic intersection; priority; cumulative count curve of vehicles......
微分方程组(dx)/(dt)=ax+by+c,dy/dt=sum(aijxiyj) i+j≥0 and i+j≤3的有限远奇点分析李继彬昆明工学院数学教研室摘 要:本文考察平面三次微分系统根据奇点分析理论,我们讨论(1)的奇点的分类方法,并研究其可能的共存分布(dx)/(dt)=ax+βy(dy)/(dt)=γx+δy+a1x2+a2xy+a3y2+a4x3+a5x2y+a6xy2+a7y3 (1)根据奇点分析理论,我们讨论(1)的奇点的分类方法,并研究其可能的共存分布.我们有结果:若a=0,则(1)的奇点有19种可能的共存分布.关键词:......
sensors at different time 图9 传感器芯片表面微硅粉累积厚度 Fig. 9 Cumulative thickness diagram of micro silicon powder on sensors 5.3 理论模型验证 由试验可知:造成传感器精度下降的原因主要是芯片表面热膜电阻前面累积了一定厚度污染物,改变了速度场,而热膜电阻上方很少有颗粒累积,不会影响加热电阻和测温电阻之...(35)可得对应的kf,如表3所示. 表3 污染物颗粒不同累积厚度下对应kf Table 3 kf at different cumulative thickness of contaminants 将不同累积厚度对应的kf代入式(35)计算得芯片表面气流速度,计算所得气流速度代入式(7)和(13)得到传感器电压理论输出值.不同累积厚度下传感器输出流量理论计算值和试验测量值对比如图10所示.由图10......
Effect of cumulative gamma irradiation on microstructure and corrosion behaviour of X65 low carbon steelCanshuai Liu1,2,Jianqiu Wang1,Zhiming Zhang1,En-Hou Han1,Wei Liu3,Dong Liang3,Zhongtian... source with 1.25 MeV gamma rays, and cumulatively absorbed gamma irradiation doses(1, 2, and 3 MGy) were obtained after different exposure time(333, 667, and 1000 h). The effect of cumulative gamma......
)09-2257-07 Analysis of cumulative lateral displacement of monopile foundations for wind turbines in soft clay HU Anfeng1, 2, FU Peng1, 2, JIANG Jinhua1, 2, XIE Kanghe1, 2, LI Liang1, 2 (1. Key Laboratory... the cumulative lateral displacement of large-diameter monopile foundation for offshore wind turbine under long-term cyclic loading. The degradation stiffness model was realized based on the subroutine provided......
of steel arch truss subjected to harmonic actions and earthquake waves were analyzed considering damage cumulative effect and initial geometrical imperfection. The dynamic responses of plastic element... ultimate load were obtained. When the ground motion record was input, the dynamic properties of steel arch truss were analyzed. The results show that when damage cumulative effect is considered......
式磨矿试验结果图 Fig. 6 G-H algorithm plot for 0.25-0.5 mm chlorite wet grinding experiment 图7 绿泥石的累积分布函数 Fig. 7 Cumulative breakage distribution function for chlorite 3.4 绿泥石的模拟计算结果...-order output characteristics at a relatively short grinding time. The cumulative breakage distribution functions for 0.25-0.5 mm size fractions of chlorite are obtained using G-H algorithm......
-weighted composite bridge deck was investigated based on the reliability theory and fatigue cumulative damage model. The results show that compared to the asphalt concrete pavement bridge deck... can reduce the fatigue life by about 70%. Key words: fatigue reliability; fatigue cumulative damage model; light-weighted composite bridge deck; fatigue life 正交异性钢桥面板具有自身质量小,强度高,施工周期短,经济性能好等优点,已广泛应用于各类......
