排序方式: 共有23条查询结果,搜索用时 295 毫秒
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我有很浓的怀旧情结,这种情结在日常生活中,就曼延到对旧建筑、旧照片、旧陶瓷、旧首饰、旧家具等一些实物的迷恋喜爱上。在那些古色古香、或巧或拙的物件中,我能感受到往昔时光的造型、色泽、材质和纹路,甚至能闻见使用这些物件的人的声音与容貌, 相似文献
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为合理利用废旧塑料,节约资源,减少污染,应用有限元分析方法,研究一种高纤维含量的软质废PVC挤出再生成型表面质量控制方案,以沿流动方向的第一法向应力差分布表征挤出物表面应力集中程度。研究结果表明:不考虑相变的情况下,降低熔体流速或提高定型段温度,有助于提升挤出物表面质量;但实际上,降低定型段温度到熔体熔点之下,挤出物表层熔体将发生相变而固化,高弹态的凝固层显著提高了挤出物的表面质量。 相似文献
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Liu Zhenzhong Deng Huiping Zhan Jian 《中国人口.资源与环境(英文版)》2007,5(3):23-30
Superfluous arsenic in drinking water can do harm to human health. In this paper, a broad overview of the available technologies for arsenic removal has been presented on the basis of literature survey. The main treatment methods included coagu- lation-sedimentation, adsorption separation and ion exchange, membrane technique, which have both advantages and disadvan- tages. It concluded that the selection of treatment process should be site specific and prevailing conditions and no process can serve the purpose under diverse conditions as each technology has its own limitations. In order to gain good results, some methods should be improved. 相似文献