共搜索到28874条信息,每页显示10条信息,共2888页。用时:0小时0分0秒765毫秒
for simulation and experiment are generally the same. The location and the size of the maximum compressive force in the simulation is similar to that in the experiment. Hence, the simulation results.... The distributions of the coupler maximum compressive forces and strokes along the train are shown in Fig. 6. From Fig. 6(a), it can be seen that four peak values appear in the distribution of the coupler maximum......
simulation model with a height of 2 m and a width of 1 m. This model contains 5242 randomly distributed particles of the same size, and the radius of each particle is 0.0155 m. Since the brittle rock... was originally derived for quasi-static problems [17]. Using these results, it is possible to investigate the effect of the loading waveform on the stress distribution within the particle sample......
. Canonical correspondence analysis [25] was employed to reveal the relationship between soil properties and fungal community. LEfSe (linear discriminant analysis effect size) for detecting biomarkers... community composition between two groups. 3.4 Phylogenetic composition of fungal community All sequences could be classified into 5 phyla and 205 genera. The distribution pattern of fungal community......
属于细尾砂,细颗粒含量多.比表面积为1.412 m2/cm3,不均匀系数Cu为6.09(>5),曲率系数Cc为0.99,级配良. 图2 不同频率超声波的指向性分布 Fig. 2 Directional distribution of different frequencies ultrasonic 图3 全尾砂粒径分布 Fig. 3 Grain size distribution of unclassified tailings 将尾砂进行X射线衍射分析,得到XRD谱,结果如图4所示. 从图4可知,该全尾砂以石英,长石,黑云母,榍石,方解石等为主要成分,此外还存在部分黄铜矿.由此说明尾砂成分由SiO2,CaCO3,硅酸盐类,铝酸盐类矿物组成,这些矿物活性低,整个试验过程中基本不参加水化反应. 2.2 试验设备 试验设备由超声波......
that the simulated airflow distribution results do not match the measured data. The stated methods work to an extent in evaluating and optimum selection of mining ventilation systems, but all have some...: 221–239. [15] KOZYREV S A, OSINTSEVA A V. Optimizing arrangement of air distribution controllers in mine ventilation system [J]. Journal of Mining Science, 2012, 48(5): 896–903. [16] DENG Li-jun, LIU......
element ratio 利用英国马尔文仪器有限公司Mastersizer2000,对实验原材料进行激光粒度分析实验,结果如图1所示. 图1 原材料粒度分布 Fig. 1 Particle size distribution of raw materials 1.2 料浆配比设计与研究 实验设计水灰比2.14,灰砂比1:4,控制变量为石粉替代水泥量,设置全水..., 延永东, 傅巧瑛. 基于分形理论的锈蚀钢筋表面轮廓分布特征[J]. 江苏大学学报(自然科学版), 2018(1): 102-107. LU Chun-hua, YANG Jin-mu, YAN Yong-dong, FU Qiao-ying. Surface profile distribution characteristics of corroded steel bar based......
丸前后试样表面XRD谱 Fig. 2 XRD patterns of NAB alloys before and after laser peening 图3 试样表面平均晶粒尺寸以及显微应变随喷丸脉冲能量的变化 Fig. 3 Variation of average crystallite size and mean microstrain...;喷丸前后镍铝青铜合金残余应力随深度分布 Fig. 10 Residual stresses distribution of NAB alloy with and without shot peening along depth from top surface 在喷丸过程中,弹丸以一定速度轰击加工表面,使得试样表层形成弹性变形区和塑性变形区,同时,在表层引入残余压应力和显微畸变.激光......
). The selected β-NA composed of the styrene butadiene rubber, sodium salt and sodium benzoate, and its average particle size was 55 nm. β-NA contents of 0.3 wt% and 0.5 wt% were compounded and fabricated...-phase to both the α and amorphous phases. Moreover, broader curves were also observed at all irradiated β-nucleated samples, which reflected the larger lamellar thickness distribution. The β melting......
isotherm shown in Figure 6. The curve showed a typical IV isotherm. The calculated specific surface areas and average pore size of 3D graphene/MgO were 274.5 m2/g and 1.93 nm, respectively. The big specific... graphene/MgO composite (e, f) Figure 5 X-ray diffraction patterns of 3D graphene and 3D graphene/MgO composite Figure 6 Nitrogen adsorption-desorption isotherm and BJH pore distribution (inset......
some dendritic phases in layer I and the eutectic phase in layer II. Figure 5 describes the distribution of Mg and Cu atoms in the interface zone, and red and green points represent Mg and Cu atoms, respectively. The result of atom distribution shows that the diffusion range of Cu atom is obviously larger than that of Mg atom. According to Dai’s discussion [7], the diffusion coefficient of Cu in Mg......