掺杂氧化铈-碳酸盐燃料电池复合电解质

介绍了用于中低温固体氧化物燃料电池的掺杂氧化铈-碳酸盐复合电解质体系,分析了组成和微结构对材料电导率和输出性能的影响,总结了已提出的多离子传导机理,探讨了材料的多种应用体系。     

升降法参数估计公式的理论分析与计算机模拟

对升降法的参数估计公式进行了理论分析推导,得到与原估计公式不同的一组参数值,并对其进行了分析修正;应用Monte Carlo方法进行了升降法的大样本模拟试验,对比了不同样本量、同一模拟试验数据、使用不同参数值计算的标准差及其相对误差。结果表明:升降法参数估计公式中的两个参数来源不清,是经验性数据,经分析修正后的参数值来源清晰,模拟结果也表明其对标准差的估计精度较高。     

铂定向表面点缀的负载钴催化剂及其芳烃饱和性能

To explore the ideal architecture of Pt-Co bimetallic catalyst for aromatics saturation, various Pt-Co bimetallic catalysts were synthesized via the galvanic replacement, the co-impregnation, and the sequential impregnation methods, and were characterized by CO chemisorption, transmission electron microscopy(TEM), H_2-temperature-programmed reduction(H_2-TPR), H_2-temperature-programmed desorption(H_2-TPD), X-ray fluorescence(XRF) spectrometry, and inductively coupled plasma atomic emission spectroscopy(ICP-AES), while the catalysts were evaluated by the flow reactor study of toluene hydrogenation. These characterization results suggest that the surface decoration of Pt has little influence on the number of active sites located on the surfaces of the reduced Co-based catalysts, but can greatly suppress the oxidation of Co at room temperature and provide the activated hydrogen at a relatively low temperature. It is demonstrated that their chemical properties and catalytic performance are largely dependent on the location of Pt atoms in the bimetallic catalysts. The architecture of Pt-Co bimetallic catalyst consisting of Co/SiO_2 decorated with 0.3% of Pt, with the most of Pt atoms being situated on the surfaces of Co nanoparticles, is the active structure for aromatic saturation and has the maximum utilization of Pt.     

射表编拟中弹丸气动力特性数值模拟技术

为求解射表编拟中弹道计算所需的弹丸空气动力系数,采用有限容积法求解N-S方程、S-A湍流模型并考虑具体边界条件,借助FLUENT模拟弹丸外流场.对某型榴弹实现了流场模拟,得到了攻角为0°、4°、8°和马赫数为0.6~2.1时的弹丸阻力系数、升力系数、俯仰力矩系数.通过该弹气动力系数数值模拟计算值与雷达数据提取值、工程计算值、纸靶试验值进行比较,表明数值模拟得到的曲线规律较好.在此基础上,采用阻力、升力符合系数修正方法,实现了数值结果在射表编拟中的应用,且精度满足射表编拟等弹道计算应用的需要.     

添加蒜黄根膳食纤维对低脂乳化肠品质的影响

将蒜黄根中提取的总膳食纤维(total dietary ifber,TDF)添加于低脂乳化肠,探究蒜黄根TDF对低脂乳化肠品质的影响.以正常脂肪添加量为对照组,实验组减少15％(以降低脂肪含量前瘦肉与猪背膘的总质量为基准)脂肪后分别添加不同质量的蒜黄根TDF(1.25％、2.50％、3.75％、5.00％、6.25％,...