Chemical stability of doped BaCeO3-BaZrO3 solid solutions in different atmospheres

BaCe0.45Zr0.45M0.1O3-δ （M=Y, In） and BaCe0.9Y0.1O3-δ were prepared through the conventional solid state reaction route. The chemical stability was investigated in hydrogen, carbon dioxide, and boiling water. Crystalline phase and microsa-ucture of the proton conductor before and after stability test were measured with X-ray diffraction （XRD） and scanning electron microscopy （SEM）, respectively. The results showed that all materials were quite stable in H2 atmosphere. In CO2 atmosphere, BaCe0.45Zr0.45M0.1O3-δ（M=Y, In） were relatively stable, while Bafe0.9Y0.1O3-δ decomposed. In boiling water, BaCe0.9Y0.1O3-δ was quickly decomposed into Ba（OH）2 and corresponding oxide. BaCe0.45Zr0.45M0.1O3-δ slightly reacted with boiling water and some amorphous phases were formed. However, BaCe0.45Zr0.45In0.1O3-δ was observed to exhibit better stability than BaCe0.45Zr0.45Y0.1O3-δ in water. The experimental results were interpreted in terms of thermodynamic data and tolerance factor.     

熔盐电解氧化亚镍制备镍粉新工艺研究

提出了以NiO为原料经一步熔盐电解得到高纯镍粉新工艺,具有工艺流程短、低能耗、无环境污染等特点.在850℃的CaCl2熔盐中,以烧结后的NiO片作为阴极,高密度石墨棒作阳极,进行电解.记录电解过程中电流变化,利用X射线衍射仪分析电解产物的成分,并用扫描电子显微镜分析不同工艺条件下压片在烧结前、后和电解后的表面及断面形貌.研究了不同的压片压力、烧结温度、烧结时间等因素对阴极形貌及其对电脱氧反应的影响.结果表明采用熔盐电解NiO粉末直接制备金属Ni的最佳的工艺条件为:NiO粉末在10 MPa下压片,900℃烧结10 h后,在850℃的CaCl2熔盐中加3.2 V槽电压下电解约9 h.     

New anodizing process for magnesium alloys

Compact anodic films with high hardness and good corrosion resistance on magnesium alloys were prepared by a new constant voltage and arc-free anodizing process. The effects of anodizing parameters such as applied voltage and electrolyte temperature on the peak current density and the thickness of films were investigated. In addition, the morphologies and corrosion resistance of films were investigated by scanning electron microscopy and potentiodynamic polarization, respectively. The results show that the higher the applied voltage, the higher the peak current density and the thicker the films. However, too high applied voltage may result in breakdown of films and intense sparking which may deteriorate the properties of the anodic films and bring about unsafety. The new anodizing process can be applied in a wide range of temperature. The new anodic films have numbers of pores with the diameter of 0.5 - 5.0 μm which do not transverse the entire film.     

矿用多协议转换网关的设计

提出了一种基于Intel XScale 32位处理器PXA270的矿用多协议转换网关的设计方案,阐述了多协议转换网关的硬件结构设计、字符设备与网络设备驱动程序,详细地介绍了多种协议之间的转换原理。该网关通过CAN总线网络、工业以太网和无线网络等网络的有机结合,解决了井下多种网络的互联及有线网络监测盲区的难题。     

煤炭企业信息化管理系统的研究

文章以国投新集能源股份有限公司的信息化管理系统改革为例,提出了一种三位一体信息化管理系统的设计方案,指出了系统的设计目标及原则,详细介绍了系统的体系结构及主要特性,阐述了三位一体信息化管理系统各子系统的功能,最后给出了三位一体信息化管理系统在国投新集能源股份有限公司的实施效果。     

基于改进的纹理合成图像修复算法

本文首先介绍了图像修复领域中的Criminisi算法,针对这种算法的不足,从优先级的运算、最优匹配块的搜索和置信值的更新三个方面进行改进。实验结果表明,改进算法的修复效果比原算法有了进一步的提高,更符合人类视觉系统的特征。     

基于特征重标定生成对抗网络的图像分类算法

针对传统鉴别器的损失策略和结构难以提取到更抽象以及任务相关的鲁棒性特征,从而导致半监督图像分类表现不足,提出了基于特征重标定的生成对抗网络。为了学习到任务相关的特征,在现有半监督GAN的基础上,为鉴别器引入模型在不同状态下的无监督均方差损失正则项,对训练样本中两个分支的同一输入对应得到的不同输出进行参数惩罚,从而指导特征重标定的优化方向。此外,在鉴别器中加入压缩激活模块来优化传统鉴别器的卷积池化结构。该模块自动学习每一个特征通道的重要程度,能够提取任务相关的特征抑制任务无关的特征,实现特征的重标定功能,从而提高半监督图像分类的表现。     

镁合金新型阳极氧化工艺的研究

采用Na3PO4、Na2WO4、成膜添加剂A及有机胺组成的碱性电解液,对AZ91D镁合金阳极氧化进行研究.结果表明:在无铬、无氟的电解液中,镁合金表面形成的氧化膜光滑致密,具有优良的耐酸碱性,并就电解液中各组分在成膜过程中的作用及电解工艺参数对成膜过程和膜层性能的影响进行了探讨.     

FFC剑桥工艺及其应用研究

FFC剑桥工艺是在熔盐体系中从固态氧化物经一步电解,得到纯度较高的金属、合金和某些非金属新工艺,是一种工艺简单、能耗低的绿色冶金新技术.阐述了FFC剑桥工艺产生、核心及其在工艺和环境方面的显著特点,综述了FFC剑桥工艺用于制备金属(Ti、Nb和Cr等)、合金、碳化物和催化剂的应用研究及在阴极制备、参比电极、熔盐干燥等方面的工艺改进研究,并描述了FFC剑桥工艺工业化现状及面临的问题.     

一种轻量级入侵检测技术

入侵检测系统需要处理大量冗余与无关数据,使得系统耗用的计算资源很大,导致系统训练时间长、实时性差、检测效果不佳.提出一种轻量级的入侵检测技术,该技术首先采用快速相关性特征选择方法消除冗余及无关特征,然后采用主成分分析对特征进行抽取.实验结果表明,此方法能够大量消减入侵检测系统需要处理的数据量,有效提升了系统性能.