一个北方乡村寺庙的千年自传(下):平顺龙门寺石刻文辑录(17~20世纪)

山西平顺龙门寺留有大量五代至民国的石碑、塔幢、题记,学界至今未有完备的整理及录文发表。笔者经多次实地踏查及文献搜集,整理、辑录了66篇(处)记文,是迄今对龙门寺文字史料最为完整的辑录。本篇为明崇祯、清、民国时期的部分,共计32篇。     

Droplet Evaporation on a Hydrophilic Mesh Considering Their Sunken Shapes in Holes

The evolution of droplet shapes on a hydrophilic copper mesh was studied by using high-speed microscopic imaging technology. When a water droplet wets a hydrophilic mesh, the liquid-vapor interface initially adopts a convex shape, named as the “first darkness”. Then, as the water evaporates, the liquid-vapor interface flattens, and then it gradually adopts a concave shape; meanwhile, a “second darkness” forms. Taking the shapes of droplets sunken in holes into consideration, the quantitative liquid-vapor interface area was acquired. The evaporation coefficient becomes lower and more reasonable when considering the area increase due to the pentahedron sunken liquid in the holes. A speculation was employed to understand the observed evaporation behavior and the overprediction of the evaporation coefficient.     

认知结构理论指导下的高校应用电化学课程双语教学实践

应用电化学是一门讲述基本电极过程、电化学分析技术及能量储存与转换等知识的专业基础课程。太原理工大学化学化工学院在认知结构教学理论的指导下,以英文原版教材为基础,以中英文结合的教学语言为媒介,采用讲授为主、翻转课堂为辅的教学方法,实施了应用电化学课程双语教学,并同步进行了实验教学和评价方式的改革。教学充分激发了学生的学习兴趣,获得了良好的效果。     

Microstructure evolution of Ti5Si3 in Cu-Ti-Si alloys

The Cu-Ti-Si alloys containing in-situ formed Ti_5Si_3 are prepared.In order to clarify the Ti_5Si_3 formation processes and its microstructure characteristics,the as-cast and deeply etched Cu-Ti-Si alloys with different compositions and cooling rates were investigated using scanning electron microscopy (SEM),transmission electron microscopy (TEM) and X-ray diffraction (XRD).It is found that the eutectic Ti_5Si_3 phases in Cu-Ti-Si alloys are rod-like with hexagonal cross section which tend to intertwine with each other to form a firm skeleton like a bird nest structure which can make the alloys keep their original shape even after etching off the Cu matrix.In addition,there is Cu in the center of many Ti_5Si_3 rods,resulting in a core-shell structure.With the increase of the cooling rate,Ti_5Si_3 distributes more uniformly,and the diameter of Ti_5Si_3 significantly decreases,with a minimum size of less than 100 nm,while the aspect ratio of Ti_5Si_3 increases.     

Analytical solution to one-dimensional mathematical model of flow and morphological evolution in open channels

Science China Technological Sciences - The evolution of open-channel flow and morphology can be simulated by one-dimensional (ID) mathematical models. These models are typically solved by numerical...     

Maximum likelihood-based adaptive differential evolution identification algorithm for multivariable systems in the state-space form

Parameter estimation plays an important role in the field of system control. This article is concerned with the parameter estimation methods for multivariable systems in the state-space form. For the sake of solving the identification complexity caused by a large number of parameters in multivariable systems, we decompose the original multivariable system into some subsystems containing fewer parameters and study identification algorithms to estimate the parameters of each subsystem. By taking the maximum likelihood criterion function as the fitness function of the differential evolution algorithm, we present a maximum likelihood-based differential evolution (ML-DE) algorithm for parameter estimation. To improve the parameter estimation accuracy, we introduce the adaptive mutation factor and the adaptive crossover factor into the ML-DE algorithm and propose a maximum likelihood-based adaptive differential evolution algorithm. The simulation study indicates the efficiency of the proposed algorithms.     

核设备抗震鉴定试验中功率谱密度检验方法分析评估

为满足核设备抗震鉴定试验中输入运动的功率谱密度（PSD）要求，基于对规范背景和目标PSD算法的调研以及典型算例的对比分析，对PSD的检验方法进行分析评估。结果表明，检验PSD最为直观的方法即对比输入运动PSD与目标PSD；根据各类目标PSD算法的结果精度、保守性及其规范依据，推荐使用2014版美国核管理委员会标准审查大纲（SRP）3.7.1节附录B中人工合成时程的方式来计算目标PSD:虽然该算法通常适用于核电厂的厂址设计反应谱，但对于设备抗震鉴定反应谱，仅需将人工合成时程的目标反应谱替换为鉴定反应谱即可；采用本文推荐方法计算目标PSD时，设备抗震鉴定输入运动的PSD检验应与SRP 3.7.1保持一致，即在0.3 Hz到目标反应谱的最高截断频率范围内包络目标PSD的70%。      

Preparation and performance of poly(lactic acid)/amidated ammonium citrate intercalated saponite nanocomposites

ABSTRACT

In this article, a novel method, amidation, was used to modify saponite. Amidated ammonium citrate intercalated saponite (Aa-saponite) was synthesized by amidation reaction. The structure of Aa-saponite was characterized by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD), demonstrating that the saponite was successfully amidated. Polylactic acid/amidated ammonium citrate intercalated saponite nanocomposites (PLA/Aa-saponite) were prepared by melt blending. Mechanical tests demonstrated that the addition of Aa-saponite (0.3 wt%) improved the impact strength of PLA. A series of performance analysis results showed that A-saponite improved the comprehensive performance of PLA, such as mechanical, thermal stability, crystallization and rheological properties.