分类： 其他 >> 综合 提交时间： 2023-03-28 合作期刊: 《中国科学院院刊》
摘要： 生物地球化学循环是物质（元素）在大气圈、水圈、生物圈与岩石圈之间流动的根本理论，对实现国家碳达峰、碳中和目标有重要指导作用。农业作为基础产业对大气温室效应的时空尺度较大，农业碳达峰、碳中和值得关注和重视，以服务于国家碳达峰、碳中和发展总体战略。文章基于生物地球化学循环视角和农业碳达峰、碳中和释义，分析了农业碳达峰、碳中和路径，从农业碳达峰面临挑战、农业碳中和面临挑战、农业碳中和潜力分析、农业碳中和误区及生物圈减排的重要性等 5 个方面进行了深入思考，并从农业碳达峰、农业碳中和与科技创新3个方面提出我国农业碳达峰、碳中和的应对策略。
分类： 材料科学 >> 复合材料 提交时间： 2021-08-13
摘要： In recent decades, carbon fiber reinforced thermoplastic from the wet-laid process (WL-CTP) appeals to attention for its simplicity and compatibility with recycled carbon fibers. However, there is still no constitutive model for the consolidation of WL-CTP. This study proposes a constitutive model based on the constitutive equation describing the compress behavior of the dry/impregnated CF network. Three deductions raised from the consolidation model were validated by the experiments investigating the effect of molding time, pressure, and temperature on the void volume fraction of the WL-CTP. Flexural testing further investigated the effect of molding time, pressure, and temperature on the flexural modulus and strength of the WL-CTP. It reveals that the molding pressure can be the only factor affecting the consolidation and flexural properties of the WL-CTP, which indicates that the WL-CTP with low void content and qualified mechanical properties can be produced under a relatively low temperature and high productivity.
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