Effects of Sn doping on the manufacturing,performance and carbon deposition of Ni/ScSZ cells in solid oxide fuel cells

This work demonstrates the effect of tin (Sn) doping on the manufacturing, electrochemical performance, and carbon deposition in dry biogas-fuelled solid oxide fuel cells (SOFCs). Sn doping via blending in technique alters the rheology of tape casting slurry and increases the Ni/ScSZ anode porosity. In contrast to the undoped Ni/ScSZ cells, where open-circuit voltage (OCV) drops in biogas, Sn–Ni/ScSZ SOFC OCV increases by 3%. The maximum power densities in biogas are 0.116, 0.211, 0.263, and 0.314 W/cm² for undoped Ni/ScSZ, undoped Ni/ScSZ with 3 wt% pore former, Sn–Ni/ScSZ and Sn–NiScSZ with 1 wt% pore former, respectively. Sn–Ni/ScSZ reduces the effect of the drop in the maximum power densities by 26%–36% with the fuel switch. A 1.28–2.24-fold higher amount of carbon is detected on the Sn–Ni/ScSZ samples despite the better electrochemical performance, which may reflect an enhanced methane decomposition reaction.     

Preparation Method and Magnetic Properties of Large-Size Bulk (Nd,Dy)FeB Magnets Obtained via Dy Diffusion Treatment During Sintering Process

Journal of Superconductivity and Novel Magnetism - Grain boundary diffusion in Dy vapor was conducted during sintering to prepare large-sized bulk (Nd, Dy)FeB magnets. The morphologies, elemental...     

缓倾斜薄—中厚矿体连续开采地压规律与控制

根据矿岩工程地质条件、岩石力学性质及采矿方案建立二维相似模型试验。通过试验研究不同采矿区域周边的近域与远域尤其是顶板覆岩的受力、变形和塑性破坏特性,分析该种方法开采的竖直方向影响高度,确定覆岩移动变形规律及铝土矿开采的影响程度。试验表明,放顶与切顶方法可有效控制采场压力、控制上部岩层的均匀沉降。     

塑性混凝土防渗墙在截渗坝中的应用

塑性混凝土是近年来发展的一种新型防渗墙体材料,在防渗工程中得到了广泛的应用,墙体结构的可靠性对防渗效果起到至关重要的作用。本文采用有限元计算方法,研究了塑性混凝土防渗墙在静力荷载以及地震荷载作用下的变形特性和应力特性,并且对其可靠性作出评价。结果表明,塑性混凝土防渗墙和墙体外围土体之间变形协调,应力状态良好,具有较好的抗震性能。     

基于EDEM的地下铲运机铲装过程仿真研究

针对地下铲运机自主铲装功能中铲装阻力的计算问题,利用EDEM软件完成数值模拟计算,利用软件生成矿石料堆模型,导入铲斗模型,设定铲斗动作,完成铲装过程的仿真。其中矿石模型的生成考虑矿石的尺寸分布,以及矿房矿石的体量,尽可能贴近实际情况。完成仿真后,总结铲装过程中铲装阻力的变化规律,为自主铲装功能的实现提供参考。     

复杂地质条件下大断面竖井爆破开挖

介绍了在复杂地质条件下大断面竖井开挖中,采用深孔掏槽爆破结合周边光面爆破技术,并根据地质条件的变化,合理选择光面爆破参数,能加快施工进度,缩短工期,取得良好的爆破效果,可供类似工程参考。     

Kinetics of collector adsorption on mineral surfaces

In the present study infrared attenuated total reflection (IR-ATR) was used to monitor the rate of in situ adsorption of heptyl xanthate on a layer of zinc sulphide synthesized on a germanium ATR crystal. The zinc sulphide surface was characterized using X-ray photoelectron spectroscopy (XPS). The absorbance of heptyl xanthate measured increased with increasing bulk concentration of the adsorbate up to an equilibrium plateau value corresponding to a fractional coverage of the surface sites of the substrate. For the adsorption from solutions of concentrations between 10⁻³ and 10⁻⁵ M, the rate of adsorption increased with increasing bulk concentration. At higher concentrations the measured absorbance should be corrected for the absorbance due to the concentration of xanthate in bulk solution. The present work provides a discussion of this correction. Assuming the adsorption stage to be rate-controlling and proportional both to the concentration of the adsorbing species in solution and unreacted surface area, a rate law governing this type of transient adsorption kinetics was derived. By means of absorbance data for the concentrations 0.1 and 0.01 mM, the rate constant of adsorption was calculated. From the initial part of a Langmuir adsorption isotherm, the absorbance at monolayer coverage and the equilibrium constant of adsorption could be estimated.     

地下铲运机自主行驶过程中转向死区的研究

地下铲运机依靠车载控制器输出的指令控制行驶方向,实现自主行驶。虽然控制器输出是线性的,但是地下铲运机动作却不是,当输出值过小,地下铲运机不转向,存在转向死区现象。对此开展研究,通过对死区的理论分析,试验测试,优化地下铲运机的控制算法,进而减小地下铲运机在行驶过程中死区的影响,提升自主行驶的控制效果。     

复杂露天铜矿床三维可视化开采工艺优化技术研究

为实现复杂露天铜矿床的高效精细化开采,探索以三维激光扫描技术为主要支撑的三维可视化开采工艺优化技术,实现露天矿采场现状模型更新、采剥量验收、爆堆统计分析以及边坡稳定性监测等数字化采矿辅助功能,为精细化、智能化采矿提供高效技术支撑。