激光对陶瓷层的釉化处理

本文研究了激光重熔等离子体喷涂的陶瓷层。为了降低气孔率,获得好的微观结构和均匀性,减少覆盖材料的应力,提高涂层材料和基体的结合力,探讨了相间的结合机理,分析了重熔过程中出现的问题。     

规划动态性特征分析及其在城市设计中的应用——以聊城市徒骇河两岸规划发展为例

城市功能交界区是城市一体化发展的重点区域,而城市中央滨水区域则是城市"都市生活"的核心区域。在功能交界区的滨水地带向中央滨水区过渡的过程中,滨水区域凭借便利的交通及优越的自然环境,往往成为城市功能角色转变中最大的区域,也是城市规划管理中最具动态性、最难控制的区域。研究以聊城市徒骇河两岸近十年的规划发展为例,分析规划动态性的成因,探究规划动态管理在城市设计中的应用,为规划编制和规划管理提供借鉴与参考。     

Experimental investigation of moderately high temperature water source heat pump with non-azeotropic refrigerant mixtures

Experimental investigations were carried out on non-azeotropic refrigerant mixtures, named M1A (mass fraction of 20%R152a and 80%R245fa), M1B (mass fraction of 37% R152a and 63%R245fa) and M1C (mass fraction of 50%R152a and 50%R245fa), based on a water-to-water heat pump system in the condensing temperature range of 70–90 °C with a cycle temperature lift of 45 °C. Performance of R245fa was tested for comparison. Unfair factors in experimental comparative evaluation research with the same apparatus were identified and corrected. Experimental cycle performance of the mixtures were tested and compared with improved experimental assessment methodology. The results show that all of the mixtures deliver higher discharge temperature, higher heating capacity, higher COP and higher ε_h,c than R245fa. M1B presents the most excellent cycle performance and is recommended as working fluid for moderate/high temperature heat pump.     

Numerical analysis of two-stroke free piston engine operating on HCCI combustion

An opposed-piston hydraulic free piston engine operating with homogenous charge compression ignition (HCCI) combustion, has been proposed by State Key Laboratory of Engines as a means of significantly improving the IC engine’s cycle thermal efficiency and lowering exhaust emissions. Single and multi-zone Chemkin model with detailed chemical kinetics, and unique piston dynamics extracted from one dimensional gas dynamic model, have been used to analyze the combustion characteristics and engine performance. Intake heating, variable compression ratio and internal EGR are utilized to control the combustion phasing and duration in the cycle simulations, revealing the critical factors and possible limits of performance improvement relative to conventional crank engines. Furthermore, real engine effects such as heat transfer with air swirl, residual mass fraction, thermal stratification, and heat loss fraction between zones are considered in the sequential CFD/multi-zone method to approach the realistic engine performance at an acceptable knock level.     

气煤联产甲醇天然气转化工艺方案选择

介绍了气煤联产甲醇氢碳互补和天然气转化工艺原理,分析了不同转化工艺的过剩氢,对一段与二段转化的天然气消耗、煤气变换率、CO2排放、动力消耗、投资进行了比较,指出了一段蒸汽转化能起到很好的补氢作用,可使水煤气的变换率为最低,一段蒸汽转化无论是在天然气消耗、动力消耗、CO2排放,还是投资上均优于二段转化,是气煤联产甲醇的最佳转化方案。     

优良成膜聚结剂的开发

本文介绍了一种新型的、性能优良的聚结剂－２，２，４－三甲基－１，３戊二醇单异丁酸酯，综述了近年来Ｔｅｘｎａｏｌ的研究和应用开发进展情况，表明酯合成反应的催化剂是影响反应收率的主要因素。     

超临界水氧化法去除废水有机氮的工艺和动力学研究

<正> 引言 超临界水氧化法(SCWO)是一种新型高效的废水和废物处理技术.水在超临界条件下具有独特的物理化学性质,它能与非极性物质如烃类和其他有机物完全互溶,而无机物特别是盐类在超临界水中的溶解度很低.另外,超临界水可以与气体(如空气、氧气、二氧化碳等)完全互溶.这些性质使得超临界水作为反应介质的超临界水氧化法具有独特的优势.在超临     

攀钢转炉氧枪软连接金属软管的应用

通过选取金属软管的结构，材质及相关参数，改善其使用条件，满足了攀钢转炉氧枪软连接的需要。     

Spray formed Al-based amorphous matrix nanocomposite plate

A novel Al₈₆Si_0.5Ni_4.06Co_2.94Y₆La_0.5 amorphous matrix nanocomposite plate with a rough diameter of 200 mm and a maximum thickness of 12 mm has been prepared by spray-forming. The microstructure gradient is observed, with 91.7 vol.% amorphous phase for the bottom region, 78% for the middle, and 54.3% for the top. The nanoindentation tests reveal its high microhardness of ∼420 HV. The microstructure characterization indicates that the improved mechanical properties may be attributed to the homogeneously dispersed nano-scale fcc-Al in the amorphous matrix. This work further proved the feasibility of achieving substantial fraction of amorphous phase for bulk Al-based alloys by spray forming.     

利用小波能量特征的增长型自组织神经网络同调机组分群方法

提出了一种利用小波变换多尺度空间能量分布特征的自组织神经网络同调机组分群方法。首先改进了同调机群识别判据,然后利用小波变换的多尺度空间能量分布特征提取方法,对机组功角摇摆曲线提取特征,将时域特征、频域特征及小波能量特征构成的综合向量,作为增长型自组织神经网络的输入,通过调节阈值λ,得出不同精度的分群结果。最后在IEEE-39节点系统上对只考虑时频域特征和同时考虑小波能量特征、时频域特征的同调机组识别结果进行了对比分析,最终表明同时考虑小波能量特征、时频域特征的分群结果具有更高准确性。