排序方式: 共有24条查询结果,搜索用时 15 毫秒
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秦皇岛市天然矿泉水水质特征及开发利用前景研究 总被引:2,自引:0,他引:2
秦皇岛市天然矿泉水主要赋存在早太古代的花岗岩和变质岩的构造裂隙与风化裂隙之中,有锶、偏硅酸、锶及偏硅酸、锶溴及偏硅酸等4种类型。矿泉水水源地数量较多,水质优良,但开采程度较低,开发利用前景广阔。 相似文献
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Chen Yayu Sun Jisheng Bi Shijun Meng Cairu Guo Fei 《Journal of Material Cycles and Waste Management》2021,23(6):2179-2191
Journal of Material Cycles and Waste Management - The rapid social development has given rise to a growing concern over environmental issues, one of which is the disposal of municipal solid waste.... 相似文献
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液膜法提取水溶液中的苯胺 总被引:16,自引:0,他引:16
本文研究了用煤油-磷酸三丁酯-Span80-脂肪酸酯-HCl溶液制成的液膜体系从水中溶液中提取苯胺的过程。并对溶剂和表面活性剂的选择及用量,搅拌速度,Rie,Rew,外相pH的选择进行了和系列的研究。结果表明,该法既适用于高浓度又适于低浓度的苯胺水溶液的处理。 相似文献
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介绍了GHS的积木原则和发达国家及地区GHS危险化学品分类积木原则的采纳情况,提出了我国GHS危险化学品分类中采用GHS分类积木原则的建议。 相似文献
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《危险化学品目录》制修订的探讨 总被引:1,自引:0,他引:1
介绍我国目前实施的《危险化学品名录(2002版)》和《剧毒化学品目录(2002版)》,以及《全球化学品统一分类和标签制度》(GHS制度)中化学品危险性分类情况,分析当前危险化学品目录与GHS制度中化学品危险性分类的差别。介绍欧盟、日本等发达国家和地区进行危险化学品GHS分类的成功经验,为我国当前危险化学品目录制修订工作提出技术性建议。 相似文献
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Guihua Zhu Feng Jiang Dongyang Tan Jisheng Zhang Ying Zhao 《International Journal of Green Energy》2018,15(2):106-112
In this research, desert sand is used as the sensible heat storage medium, which exchanges heat with air in the downcomer to realize heat storage and heat release. The desert sand distribution uniformity has a significant impact on the heat exchange performance and efficiency between desert sand and air for the process of convection in the downcomer. Given the superiority of sensible heat storage in convective heat transfer between desert sand and air, distributors with cylinder or conical bore solid particles and homogeneity performance testing device are designed and manufactured on the basis of convection system equipped with solid particle–air downcomer. Then, the convection experiment between solid sand and air is researched. The greater the desert sand flow rate and higher the volume density, the larger the variance of regional mass flow rate and the worse the homogeneity performance. For the cylinder bore distributor, the smaller the sand particle size is, the greater affected the sand groups can be. The sand homogeneity performance is preferable with the two particle size ranges: 0.18-0.25 mm and 0.15-0.18 mm. The total sand flow rate decreases, but the uniformity improves with the increase of the air flow velocity, and the best distribution performance is achieved at an air velocity of 0.6 m/s. However, the distribution performance declines with the air flow velocity persistently increasing because the sand groups are pushed to one pipe side close to the wall. The sand groups deflect seriously with the air flow velocity increasing. 相似文献