High performance composite interconnect La0.7Ca0.3CrO3/20 mol% ReO1.5 doped CeO2 (Re = Sm,Gd, Y) for solid oxide fuel cells

This paper reports and discusses composite interconnect materials that were modified from La_0.7Ca_0.3CrO_3−δ (LCC) by addition of Re doped CeO₂ (Re = Sm, Gd, Y) for improved conductivity at relative low temperatures. It is found that the addition of small amounts of RDC (ReO_1.5 doped CeO₂) into LCC dramatically increased the electrical conductivity. For the best system studied, LCC + 5 wt% SDC (Sm_0.2Ce_0.8O_1.9), LCC + 3 wt% GDC (Gd_0.2Ce_0.8O_1.9) and LCC + 3 wt% YDC (Y_0.2Ce_0.8O_1.9), the electrical conductivities reached 687.8, 124.6 and 104.8 S cm⁻¹ at 800 °C in air, respectively. The electrical conductivities of the specimens, LCC + 3 wt% SDC, LCC + 1 wt% GDC and LCC + 2 wt% YDC in H₂ at 800 °C were 7.1, 3.8 and 5.9 S cm⁻¹, respectively. With the increase of RDC content, the relative density increased, indicating that RDC served as an effective sintering aid in enhancing the sinterability of the powders. The average coefficient of thermal expansion (CTE) at 30–1000 °C in air increased with the increase of the RDC content. The oxygen permeation measurements indicated a negligible oxygen ionic conduction, indicating that the efficiency loss of a solid oxide fuel cell by permeation is negligible for the general cell design using LCC + RDC as interconnect. Therefore, the composite materials La_0.7Ca_0.3CrO₃/20 mol% ReO_1.5 doped CeO₂ are very promising interconnecting ceramics for solid oxide fuel cells (SOFCs).     

中温固态氧化物燃料电池

综述了当前国际上正在研制的几种中温固态氧化物燃料电池的现状及发展趋势，特别介绍了本实验室新近发展的基于新型复合电解质的中温固态氧化物燃料电池，并讨论和评价了中温固态氧化物燃料电池的应用前景，包括在电动汽车方面的潜在应用优势。     

Shape variable radial basis function and its application in dual reciprocity boundary face method

The radial basis functions (RBFs) is an efficient tool in multivariate approximation, but it usually suffers from an ill-conditioned interpolation matrix when interpolation points are very dense or irregularly spaced. The RBFs with variable shape parameters can usually improve the interpolation matrix condition number. In this paper a new shape parameter variation scheme is implemented. Comparison studies with the constant shaped RBF on convergence and stability are made. Results show that under the same accuracy level, the interpolation matrix condition number by our scheme grows much slower than that of the constant shaped RBF interpolation matrix with increase in the number of interpolation points. As an application example, the dual reciprocity method equipped with the new RBF is combined with the boundary face method to solve boundary value problems governed by Poisson equations. Numerical results further demonstrate the robustness and better stability of the new RBF.     

Effects of Fullerene Bisadduct Regioisomers on Photovoltaic Performance

Fullerene bisadducts have emerged as promising electron‐accepting materials because of their ability to increase the open‐circuit voltage (V_OC) of polymer solar cells (PSCs) due to their relatively high lowest unoccupied molecular orbital (LUMO) energy levels. It should be noted that the as‐prepared fullerene bisadducts are in fact a mixture of isomers. Here, the effects of fullerene bisadduct regioisomers on photovoltaic performance are examined. The trans‐2, trans‐3, trans‐4, and e isomers of dihydronaphthyl‐based [60]fullerene bisadduct (NCBA) are isolated and used as acceptors for P3HT‐based PSCs. The four NCBA isomers exhibit different absorption spectra, electrochemical properties, and electron mobilities, leading to varying PCE values of 5.8, 6.3, 5.6, and 5.5%, respectively, which are higher than that based on an NCBA mixture (5.3%), suggesting the necessity to use the individual fullerene bisadduct isomer for high‐performance PSCs.     

铅锌选矿废水处理自控系统设计及应用

针对铅锌矿选厂人工简单处理废水带来的水质差、指标不稳定、无法连续回用等问题,设计了一种高效的选矿废水处理自动化系统。根据废水的处理方法为沉淀-石灰中和法-曝气法工艺,采用了先进的自动化集成系统,并通过多种算法优化各项环节的PID控制系统,使选矿废水稳定达到废水排放指标,并循环利用了可回收矿物泥以及水资源,最后,设计整体的自动化监控系统软件,提升废水处理的管理水平。以某铅锌矿选矿为例进行工程应用,结果表明,废水处理过程的全面自动化进行工程应用,降低人力成本,出水水质达标,可以为偏僻的矿山实现了水的循环使用,保证了生产的稳定。     

底水丘滩体储集层特征及开发对策

碳酸盐岩底水气藏储集层复杂多样,储集层中裂缝发育,导致气井出水,气藏开发效果差。以土库曼斯坦阿姆河盆地BTU碳酸盐岩气田为例,通过分析研究区地质特征,明确了裂缝发育特征,揭示了气井高产的有利因素。基于水体能量评估结果和储集层物性特征,细分丘滩体水侵储集层类型,评估不同类型气藏水侵风险。分析不同类型气井生产动态,总结气井出水动态特征和产量递减规律,结合国内外控水采气经验,从而提出不同水侵特征类型储集层高效开发对策。     

某核电厂主泵变频器故障分析与可靠性提升

我国某三代压水堆机组主泵必须配置变频器,且变频器与主泵长时间同时运行,因而变频器的可靠性对机组的稳定运行和经济效益具有重要意义。本文主要介绍了主泵变频器的可靠性设计,分析了某核电厂1、2号机组变频器历史故障,找出了影响主泵变频器可靠性的薄弱点,提出了相应故障的应对措施和提升可靠性的措施,对国内后续该机型主泵变频器的设计优化、设备制造和运行维护有一定的借鉴意义。     

基于CMS91航空FHS系统的设计与实现

综述了目前国内民用航空机场在飞机加油生产过程中采用手工操作方式的缺陷；介绍了国际航空市场的航空加油管理系统中的新技术。在此基础上，结合深圳宝安机场承远航空油料公司的实际生产要求，借鉴国际航油管理新技术提出了基于CMS91模块的无线通信模式实现机场油料管理；设计并研制了基于GPRS CMS91模块的FHS雏型系统，经测试能够满足生产需求，具有一定的推广应用价值。     

带压堵漏作业防护探索与研究

本文分析了泄露现场的化学和物理危害因素及由此导致的各种后果,而且针对泄露事故对作业人员不同部位的伤害提出了相对应的个人防护用品,同时提供了与之相对应的国家行业标准.     

真实拉延筋参数化建模及其在薄板冲压仿真中的应用

提出一种参数化的拉延筋网格模型建模方法,在自主开发的有限元前处理软件中,建立了具有真实几何尺寸的半圆形、三角形拉延筋和拉深槛的网格模型,并提供了灵活的拉延筋布置手段。提出一种改进的全四边形网格加密方法,对成形过程中将会流过拉延筋区域的板料网格,以及可能与模具上曲率变化大的区域相接触的板料网格进行加密操作,以满足网格的适应性要求。提出一系列的网格拓扑清理模版,对加密后的网格进行拓扑清理操作,有效地提高了板料网格的质量。大量的算例证明所提出方法具有较高的精度和较强的工程实用性。