氟树脂涂料附着力的增强方法

概述了氟树脂涂料的品种及应用,较详细地介绍了氟树脂涂料附着力的增强方法。     

气体在13X分子筛晶内有效扩散系数的研究与测定

采用单颗粒反应器技术,在293～433K温度范围内,用He,H_2,CO_2,C_2H_4气体对13X沸石分子筛上的晶间扩散与晶内扩散进行了研究与测定,并通过理论分析,提出了气体在13X分子筛晶内有效扩散系数的计算模型。     

An improved form of smoothed particle hydrodynamics method for crack propagation simulation applied in rock mechanics

The simulation of crack propagation processes in rock engineering has been not only a research hot spot among scholars but also a challenge. Based on this background, a new numerical method named improved kernel of smoothed particle hydrodynamics(IKSPH) has been put forward. By improving the kernel function in the traditional smoothed particle hydrodynamics(SPH) method, the brittle fracture characteristics of the base particles are realized. The particle domain searching method(PDSM) has also been put forward to generate the arbitrary complex fissure networks. Three numerical examples are analyzed to validate the efficiency of IKSPH and PDSM, which can correctly reveal the morphology of wing crack and the laws of crack coalescence compared with previous experimental and numerical studies.Finally, a rock slope model with complex joints is numerically simulated and the progressive failure processes are exhibited, which indicates that the IKSPH method can be well applied to rock mechanics engineering. The research results showed that IKSPH method reduces the programming difficulties and avoids the traditional grid distortion, which can provide some references for the application of IKSPH to rock mechanics engineering and the understanding of rock fracture mechanisms.     

The response of plasma parameters and energy transport in the plasma sheet to interplanetary magnetic field Bz

Science China Technological Sciences - We use 9 years data of Cluster to study the dependencies of plasma parameters and energy transport in the plasma sheet on the lasting time of...     

《单片机原理及应用》课程思政的实践探索——以“单片机的存储器结构”知识点讲解为例

针对《单片机原理及应用》及其相关课程在课程思政建设中存在的问题,提出一种课程思政设计思路,即选取合适的授课内容与思政素材,从教学目标和教学设计出发,将思政素材自然融入到授课内容中。并以“单片机的存储器结构”知识点讲解为例,详细介绍了以上课程思政设计思路的具体设计与实施过程,具有较强的创新性与可操作性,对单片机类课程线上及线下教学的课程思政建设有一定的借鉴意义。     

不同挡板结构对油箱内油液晃动特性的数值分析

当汽车处于变工况行驶时,油液在油箱内反复晃动会造成晃动噪声、高变速工况下油液供给中断、油气挥发量增加和油箱及其内置件结构损坏等问题产生.为了优化油液防晃结构,创建了充液油箱三维有限元模型,同时验证了仿真参数设置的合理性,并通过试验验证了仿真结果的准确性.利用VOF法,分别模拟了无孔、少孔和多孔挡板、圆孔和椭圆孔挡板、高...     

GPPre: A Python-Based Tool in Grasshopper for Office Building Performance Optimization

With the development of the economic and low-carbon society, high-performance building (HPB) design plays an increasingly important role in the architectural area. The performance of buildings usually includes the building energy consumption, building interior natural daylighting, building surface solar radiation, and so on. Building performance simulation (BPS) and multiple objective optimizations (MOO) are becoming the main methods for obtaining a high performance building in the design process. Correspondingly, the BPS and MOO are based on the parametric tools, like Grasshopper and Dynamo. However, these tools are lacking the data analysis module for designers to select the high-performance building more conveniently. This paper proposes a toolkit “GPPre” developed based on the Grasshopper platform and Python language. At the end of this paper, a case study was conducted to verify the function of GPPre, which shows that the combination of the sensitivity analysis (SA) and MOO module in the GPPre could aid architects to design the buildings with better performance.     

日本稀土贮氢电池现状和发展趋势

本文论述了日本稀土贮氢电池的生产现状、市场分析和发展趋势。     

GIS中的快速暂态过电压及影响因素分析

在本文建议的简化等值回路进行验证的基础上,计算了某一国产GIS中隔离开关操作引起的快速暂态过电压,并对一些影响因素进行了分析讨论。     

Large-scale production of bioactive ingredients as supplements for healthy human and animal nutrition

In this review, synthetic strategies and the development of environmentally benign methods for the production of economically important vitamins, carotenoids, and nutraceuticals used as food and feed supplements are illustrated by selected examples. The application of efficient catalytic transformations in multi-step chemical syntheses of such natural products enables technically feasible and cost-effective processes. For the preparation of fat-soluble (isoprenoid) vitamins A and E and the water-soluble vitamin (+)-biotin, homogeneous metal catalysis, including enantioselective transformations, heterogeneous and enzymatic catalysis serve as key methodologies. In the area of carotenoids, general building concepts and coupling methods for the total synthesis of beta-carotene and astaxanthin are discussed. Biotechnological methods and isolation from natural sources are also employed successfully, as exemplified for the xanthophyll lutein and the antioxidant (-)-epigallocatechin gallate. Lastly, key steps of the chemical synthesis of the polyphenol resveratrol are highlighted.