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91.
Yang Jinghan Feng Jianguo Sun Chencheng Chen Wang Ma Yingjian Chen Zhiyang Dong Sa Deng Wei 《Journal of Polymers and the Environment》2021,29(10):3145-3153
Journal of Polymers and the Environment - Microcapsulses can effectively encapsulate, protect, and control the release of insecticides. In this study, emulsion–solvent evaporation method was... 相似文献
92.
Based on the theory of gas-solid two-phase flow and the characteristics of cavern stope a model of dust migration was established. The dust concentration changing of cavern stope by ventilation in 20 min after blasting and the dust trajectory in different wind speed were simulated by Fluent Software. The results show that distribution of dust concentration is significantly affected by flow field of airway in cavern, and the dust concentration of inlet is higher than that of outlet and the highest one on the corner of inlet’s side. In the stope, the smaller the wind speed of inlet is, the shorter of dust can be captured, settled and discharged, the more obviously affected by the trajectory of gas flow field. It goes into the stage of clean cycle emissions after 60 s, the speed of dust concentration dropped is the biggest between 0 s and 70 s, the main dust in stope is respirable dust after 70 s, it needs much time to settlement.According to the measured data of metal mining, approximately 87% of dust was generated during the drilling and blasting in the mine (Wang, 1979). A lot of dust with high concentrations was produced during the cavern stope blasting and it was difficult to be discharged. It can help choose the right speed to rule out the dust quickly which produced during cavern blasting, if the dust concentration distribution and the dust migration law of different inlet velocity in the cavern can be verified, what’s more, the labor productivity can be increased. It has great significance for choosing reasonable ventilation parameters, reducing dust hazards of stope to researching the dust concentration distribution regularity in the stope. 相似文献
93.
以堆煤场煤尘为对象,在对粉尘颗粒在大气中的受力状况进行分析的基础上,对开放性尘源表面的粉尘起尘及其在大气中扩散的运动轨迹进行了理论研究和数值模拟。利用Lagrange方法,研究了堆煤场煤尘颗粒群的扩散运动方程,为利用计算机对颗粒运动轨迹进行模拟提供了科学依据,同时为评价露天矿堆煤场对环境造成的污染提供了理论指导。 相似文献
94.
Johan Gardères Laure Taupin Jasnizat Bin Sa?din Alain Dufour Ga?l Le Pennec 《Marine Biology》2012,159(8):1685-1692
Many bacteria live in close association with sponges. Within these consortia, molecules of communication such as quorum-sensing and hormone-like molecules may occur in order to regulate the partnership. Of particular interest, bacterial N-acyl-l-homoserine lactones (AHLs) were screened in supernatants from Suberites domuncula-associated bacteria using an E. coli bioluminescent reporter system. These sponge-associated bacteria were beforehand isolated on several media supplemented or not with a sponge extract to attempt to isolate sponge-specific bacteria. Out of 81 AHL-producing bacteria, three strains requiring sponge extract to grow were selected for AHL characterization. The in vitro produced AHLs, that is, in bacterial culture supernatants, were identified as N-(3-butanoyl)-l-homoserine lactone and N-(3-oxododecanoyl)-l-homoserine lactone and quantified using LC–ESI–MS/MS. The in vivo production of AHLs by sponge-associated bacteria has also been demonstrated in a healthy host for the first time: N-(3-oxododecanoyl)-l-homoserine lactone, N-(3-hexanoyl)-l-homoserine lactone, and N-(3-heptanoyl)-l-homoserine lactone. This AHL production in sponges may suggest a potential role of these molecules between sponge-associated bacteria and/or between sponge-associated bacteria and the sponge. 相似文献
95.
以聚丙烯酰胺(PAM)为助凝剂,在加载絮凝(BF)与超滤(UF)组合工艺净水过程中,系统考察了PAM投加量和原水pH对膜通量衰减及污染可逆性等的影响,并结合加载絮体形态特征与膜污染的相关性,进一步探究了膜污染的生成机理。结果表明,PAM投加量对加载絮体形态、膜滤效能和膜污染的影响显著,且PAM投加量在不足或较大的情况下均会产生不利影响,应以0.3 mg·L−1为宜;在中性条件下的膜污染程度低于偏碱性条件下,而酸性条件下的膜污染程度最为严重,此时膜表面累积形成滤饼层与膜本身之间的静电作用主导膜污染;对于平均粒径大于0.75 mm、分形维数小于1.35的加载絮体,其粒径较大、结构较为松散时形成的滤饼层并不能有效缓解膜污染。从优化运行的角度来看,减少加载絮凝水样中溶解态污染物和未被捕获微砂颗粒的含量以及不含微砂的凝聚体的占比,成为延缓膜污染和稳定出水水质的关键。 相似文献
96.
97.
Li Ying-qiang Liu Ze-hua Chen Sa Wu Ying-juan Liang Jing-tang Dang Zhi Liu Yun 《Environmental science and pollution research international》2023,30(1):594-605
Environmental Science and Pollution Research - Amino acids (AAs) are important nitrogen-containing organics in water, and a large number of reports have proven that they were the precursors of many... 相似文献