Preparation, characterization and the electrogenerated chemiluminescence behavior of WO3 nanocrystals

The (WO₃)_NCs/Nafion film electrode was prepared by immobilizing the synthesized WO₃ NCs on the surface of a glassy carbon electrode (GCE) with the help of Nafion. The ECL emission of the electrode in aqueous solution was affected by the buffer solution with respect to the pH and composition. And the strongest ECL was observed in an NH₃-NH₄Cl buffer with pH being 8.2. Only a weak ECL peak at 1.14 V which was originated from the annihilation process between oxidized and reduced species of WO₃ NCs was found. By adding coreactant triproplamine (TPrA) in buffer solution, an additional ECL peak at 1.13 V which was attributed to the electron-transfer reaction between the oxidized WO₃ NCs and reduced intermediate of TPrA was observed. The (WO₃)_NCs/Nafion film electrode exhibits excellent ECL property and good stability, which would promote the potential application of WO₃ NCs as a luminescence material for solid-state ECL detection.     

融入城市公共景观空间的建筑遗产保护策略 ——南京市雨花台区明临安公主墓保护方案设计

南京市明临安公主墓是2018年修建公路时发掘的一座明代砖室墓,墓体规模宏大,结构造型优美,是南京明代皇族墓葬的重要发现.文章针对临安公主墓的就地保护与展示问题,从融入城市公共空间与景观体系的角度出发,探索城市历史遗址的保护策略.设计方案基于城市公共空间与历史景观的营造,对历史遗址进行有效的保护和展示,希望达到建筑遗产与城市空间的有效沟通与互动,让城市遗产契合动态发展中的社会需求,重新融入现代城市的生活体系,达到遗产和城市共生的状态.     

异步电机矢量控制变频调速系统的Simulink仿真研究

在分析异步电机矢量控制原理和矢量控制变频调速系统结构的基础上,利用Simulink和PSB工具箱中的库元件,建立了异步电机矢量控制调速系统的仿真模型并进行了仿真实验.仿真结果验证了该模型的有效性和矢量控制调速系统动静态性能的良好性.     

Effect of several solid lubricants on the mechanical and tribological properties of phenolic resin‐based composites

The flake graphite, polytetrafluoroethylene, and molybdenum disulfide (MoS₂) filled phenolic resin‐based composites were prepared by hot press molding. The thermal, mechanical, and tribological properties of composites were studied systematically. The morphologies of the worn surfaces and the change of chemical compositions during the sliding process of the composites were analyzed by scanning electron microscopy and X‐ray photoelectron spectroscopy, respectively. It was found that the heat‐resisting performance and the hardness of the composites are less affected by solid lubricants, while the solid lubricants did harm to the flexural strength of the composites. The friction and wear behaviors of composites highly depended on the volume fractions of solid lubricants and the sliding conditions. The wear resistance increases and the coefficient of friction decreases when the filler load increases. In addition, the appropriate content of solid lubricants is beneficial to reducing the sensitivities of the composites to load and sliding speed. POLYM. COMPOS., 36:2203–2211, 2015. © 2014 Society of Plastics Engineers     

汽车齿轮制造过程中钢的组织控制

以新型Cr-Ni-Mo系齿轮钢20CrNi2MoH钢为例,分别论述20CrNi2MoH钢锻造齿坯和该钢冷挤压坯料的组织控制.     

气体吸附对SnO2／Si光电压的影响

测量了ＳｎＯ２／Ｓｉ表面吸附Ｈ２、液化石油气等还原性气体前后光电压的变化；分析了ＳｎＯ２／Ｓｉ表面的吸附性和机理。     

9Al2O3·2B2O3晶须补强PZT95/5型铁电相变陶瓷材料的研究

本文采用９Ａｌ２Ｏ３、２Ｂ２Ｏ３晶须补强了ＰＺＴ９５／５型铁电相变陶瓷材料，研究了晶须添加量与材料的和学性能之间的关系，实验结果表明：（１）复合材料的最佳烧结温度随着添加含量的增加而降低，（２）适量的晶须添加对的特殊电性能无明显影响，而材料的力学性能有较明显的改善，例如含０．３ｗｔ％晶须的材料，其抗折强度比基料提高了４２．２４％，（３）晶须的拔出，桥接对的增韧中具有重要意义。     

高功率激光系统的低阶鬼点位置公式

在近轴条件下，采用矩阵光学，推导出了光束传输过程中单个凸透镜、凹透镜以及4F系统产生的低阶鬼点的位置公式，并分析其分布规律。     

用无烟煤为基础煤研制热压型焦

本文阐述了新的炼焦工艺──热压型焦工艺中热压成型参数的选择方法，描述了试验所制热压型焦的优良性能。     

枣园油田孔一、孔二段流体性质分布及地球化学模型

流体和储层一样是油藏的重要组成部分,是油藏描述研究的重要内容.本文在综合研究枣园油田流体物理性质和地球化学特征及流体性质分布的基础上,以计算机为手段,采用克里金技术,建立了枣园油田孔一、孔二段流体性质分布三维地质模型,总结了建立模型的一整套技术方法.这项技术已广泛应用在油藏描述中,并取得了良好应用效果.