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ammonia is a great threat to operator’s health and environment [20, 21]. Many researchers have focused on the improvement of current zinc extracting methods from complex zinc oxide ore. NaOH roasting... energies (E) of ZnO’s and SiO2’s extracting reaction were calculated to be 20.81 kJ/mol and 13.97 kJ/mol, respectively. The corresponding frequency factors (A) were 0.0529 and 0.0148, respectively......
过饱和状态[11-13].与1号合金完全不同,2号合金沿晶界连续分布着众多粗大的骨骼状共晶组织(图1(b)).通过观察可以发现,这些共晶组织由黑色,灰色和白色这3种颜色的第2相组成.根据文献[14-15]可知这种共晶组织为α(Al)+ θ(Al2Cu)+S(Al2CuMg)三元共晶. 2.2 合金的流变应力 图2和图3所示分别为不同应变速率条件下1号合金,2号合金在...): 701-706.CAO Chunxiao. One generation of material technology, one generation of large aircraft[J]. Acta Aeronautica et Astronautica Sinica, 2008, 29(3): 701-706. [2] CHEN Y Q, PAN S P, ZHOU M Z, et......
系分别为与,基线距为b,焦距为f,同时观看空间物体的同一特征点P,在左右摄像机成像面上所成的点分别为P1(u1,v1)和P2(u2,v2).将成像模型投影到X-Z面可得图3所示投影图,O1和O2分别是左右摄像机的透镜中心,s为从点P到左右摄像机透镜中心连线的距离. 图2 双目立体视觉成像原理 Fig. 2 Imaging principle of binocular...在SXGA(1 280像素×1 024像素)状态下为15 帧/s,USB接口;研祥IPC-810E型工业控制计算机;YF-T10对射式光电传感器;定制的三维立体靶标,靶标边长为500 mm,3个平面长×宽为60 mm×60 mm的黑白棋盘格. 图8 实验系统布置图 Fig. 8 Layout of experimental system 4.3 最小二乘法拟合......
to alumina: Part 1: Origins and chemistry of organics in the Bayer process[J]. Hydrometallurgy, 2010, 105(1/2): 1-29. [2] POWER G, LOH J S C, WAJON J E, BUSETTI F, JOLL C. A review of the determination of organic compounds in Bayer process liquors[J]. Analytica Chimica Acta, 2011, 689(1): 8-21. [3] POWER G, LOH J S C, K. Organic compounds in the processing of lateritic bauxites to alumina......
before and after electroplating, respectively; S is the surface area, and t is time. Table 1 Bath composition and process parameters 2.2 Material characterization Scanning electron microscopy (SEM... curve was obtained at the potential of (φocp±200) mV with a scanning rate of 5 mV/s. EIS was conducted at the open circuit potential with amplitude of 5 mV in the frequency range of 105-10-2 Hz. 3......
analysis results show that the raw sample contains 1.44% Pb, 7.04% Zn, 1.89% S, 4.72% Fe, 32.43% SiO2, 18.62% CaO, and so on. Based on XRD detection, the main valuable minerals are cerusite... in Fig. 6, the species dominates when pH<10.98, whereas the species RNH2(s) and RNH2(aq) dominate when pH>10.98 [27]. Therefore, we can conclude that the more positive charge......
能的重要途径,Ag,P,Cr等元素已被报导应用于Cu-Fe合金的多元合金化中[2-6].WANG等[7]通过在 Cu基体中溶质原子-空位结合能的计算,筛选出了可行的14种合金元素:Ag,Al,B,Bi,Cd,Ge,In,Mg,P,S,Sb,Si,Sn,Zr.如何在这诸多合金元素中筛选出有利的合金元素的一直是个尚待解决的问题.加快Fe的时效析出是改善Cu-Fe合金性能的关键.过饱和Cu-Fe合金在时...]:在Cu基体中,合金原子B,Si,P,Al,Ge,S,In,Zr与Fe之间有较强的结合能,位于Fe原子的最近邻位置;而Mg,Ag,Cd,Sn,Sb,Bi和Fe原子结合较弱,倾向于远离Fe原子,这与本研究的计算结果基本相符. 表2 Cu(100)和γ-Fe(100)表面能 Table 2 Surface energies of Cu(100) and γ-Fe(100) 图......
; electrolytic aluminum; motion control; multi-layer and multi-pass automatic welding 作为传统重工业,电解铝厂的作业环境极其恶劣:车间温度最高可达50 ℃;高浓度粉尘中含有氧化铝,沥青,石油焦等有害物质;电解槽附近的气体中含有大量的氟化物,硫化物,一氧化碳等;磁感应强度高达12.5 mT.此外,噪声,机械,电气危害等都时刻严重...初定位,将末端执行器放置到合适的位置,末端执行器有2个自由度以实现焊接操作.该系统的其余关键技术指标[19]如表1所示. 4.3 焊接参数 实验过程中采用如表2所示的焊接参数,在机械臂的带动下,同时对2个阴极棒头进行多层多道焊接,首先对左侧进行焊接,然后对右侧进行焊接,机械臂向上提升3 mm,如此循环往复,因为这种焊接工艺要求每完成一道,冷却40 s,控制层间温度,防止过高,以保证焊接......
线.采用3种电极体系:待测试样为工作电极(工作面积为1 cm2),铂片电极为辅助电极,饱和甘汞电极(SCE)为参比电极.腐蚀溶液为3.5% NaCl(质量分数)溶液,实验温度控制在(20±1) ℃.实验前样品浸泡30 min以获得稳定的开路电位(Eocp). 电化学阻抗谱(EIS)测量参数如下:初始电平为开路电位,扫描频率为10-2~105 Hz,振幅为0.01 V,静止时间为2 s,选择自动灵敏度.采用ZSimpWin 3.20软件,选择合适的等效电路图对EIS图谱进行拟合从而计算获得EIS电化学参数. Tafel曲线测量参数如下:初始电位较开路电位为-0.5 V,终止电位较开路电位为+0.5 V,扫描段数为2 s,扫描速度为5 mV/s,选择自动灵敏度.测出Tafel曲线后,利用电化学工作站自带的"Special Analysis"功能得出自腐蚀电位(Ecorr),自腐蚀电流......
and Engineering A, 2014, 619: 228-237. [4] ZHU Q, MIDSON S P. Semi-solid moulding: Competition to cast and machine from forging in making automotive complex components [J]. Transactions of Nonferrous Metals Society of China, 2010, 20: 1042-1047. [5] ZHAO Z, CHEN Q, HU C, HUANG S, WANG Y. Near-liquidus forging, partial remelting and thixoforging of an AZ91D + Y magnesium alloy [J]. Journal of Alloys......