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超微粉体上升层流水力分级实验研究 被引量:2
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作者 邓丽荣 王晓刚 +3 位作者 王丹 陆树河 华小虎 王嘉博 《中国粉体技术》 CAS 北大核心 2014年第2期22-24,30,共4页
以中位粒径d50为1.14μm的β-SiC超微粉体为分级原料,采用自行研发的上升层流水力分级方法进行分级实验研究,以示踪液进行分级管内流态的观察和判别。结果表明,通过调节多孔陶瓷模块结构和水流速度,能获得稳定、均匀的层流力场;在层流... 以中位粒径d50为1.14μm的β-SiC超微粉体为分级原料,采用自行研发的上升层流水力分级方法进行分级实验研究,以示踪液进行分级管内流态的观察和判别。结果表明,通过调节多孔陶瓷模块结构和水流速度,能获得稳定、均匀的层流力场;在层流状态下,流体速度为2.5、2.0 m/h时,在不同高度的取料口处获得平均粒径分别为0.86、0.75、0.50、0.40μm的分级产物,实现β-SiC超微粉体的精细分级。 展开更多
关键词 超微粉体 上升层流 水力分级 层流力场
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Distribution of Biogenic Silica Content in Surface Sediments from the Southern South China Sea and Its Environmental Dignificance 被引量:5
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作者 张兰兰 陈木宏 +2 位作者 向荣 陆钧 张丽丽 《Marine Science Bulletin》 CAS 2009年第1期43-52,共10页
Biogenic silica content was determined in 25 surface sediment samples from the southern South China Sea to study its distribution and its modern oceanic environmental significance, which may provide further scientific... Biogenic silica content was determined in 25 surface sediment samples from the southern South China Sea to study its distribution and its modern oceanic environmental significance, which may provide further scientific evidence for paleoceanography explaination. This study showed that biogenic silica content in surface sediments and its water depth have evidently positive correlation, and the correlation coefficient was up to 0.782. Biogenic silica content was very low in continental shelf shallows and could not reflect the productivity of siliceous micropaleontology in surface waters, which may be affected by sedimentary types and terrigenous matter dilution. Distribution of biogenic silica content in surface sediments from deep water areas showed that it could not only reflect the paleoproductivity of siliceous micropaleontology in surface waters, but also indicate the strong or feeble upwelling. Thus, it was further confirmed that using biogenic silica content in sediments to trace upwelling and its change was effective and reliable. The analyzed result showed that radiolariia and poriferous specula have more contribution for biogenic opal, comparing with diatom in surface sediments from the northern studied area, probably owing to the diatom dissolved easily away and eaten by other organisms with little effort. In the upwelling areas, radiolarian, diatom and poriferous specula all approximately showed high abundance, which was consistent with high biogenic silica content. 展开更多
关键词 southern SCS surface sediments biogenic silica UPWELLING
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Research progress in artificial upwelling and its potential environmental effects 被引量:4
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作者 PAN YiWen FAN Wei +7 位作者 ZHANG DaHai CHEN JiaWang HUANG HaoCai LIU ShuXia JIANG ZongPei DI YaNan TONG MengMeng CHEN Ying 《Science China Earth Sciences》 SCIE EI CAS CSCD 2016年第2期236-248,共13页
Artificial upwelling, as a geoengineering tool, has received worldwide attention because it may actualize ocean fertilization in a sustainable way, which could potentially alleviate the pressures on the fish stocks an... Artificial upwelling, as a geoengineering tool, has received worldwide attention because it may actualize ocean fertilization in a sustainable way, which could potentially alleviate the pressures on the fish stocks and human-driven climate change in the ocean. We reviewed the current knowledge on the development of an artificial upwelling system and its potential environmental effects. Special attention was given to the research progress on the air-lift concept artificial upwelling by Zhejiang University. The research on artificial upwelling over the past few decades has generated a range of devices that have been successfully applied in the field for months. Based on field experiments and the associated modeling results, part of them reported positive effects on increasing primary production and enhancing CO2 sequestration. However, as a significant disturbance to the environment, especially for large-scale applications, the uncertainties related to the potential effects on ecosystem remain unsolved. Zhejiang University has overcome the technical challenges in designing and fabricating a robust and high efficiency artificial upwelling device which has been examined in two field experiments in Qiandao Lake and one sea trial in the East China Sea. It was investigated that cold and hypoxic deep ocean water(DOW) could be uplifted to the euphotic layer, which could potentially change the nutrient distribution and adjust the N/P ratio. Both simulation and field experiments results confirmed that utilizing self-powered energy to inject compressed air to uplift DOW was a valid and efficient method. Therefore, further field-based research on artificial upwelling, especially for long-term field research is required to test the scientific hypothesis. 展开更多
关键词 Artificial upwelling Air-lifting SELF-POWERED Environmental impacts Research progress
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