Wavelet Transform of Velocity-Time Data for the Analysis of Turbulent Structures in a Trayed Bubble Column

Hydrodynamic and turbulent structures in the trayed bubble column with 1.2 m inner diameter have been characterized from liquid-phase velocity-time series data obtained by the hot-film anemometer. Wavelet transform analysis was used for denoising the measured data and also for evaluating quantifiers of turbulence, viz., local intermittency measure, intermittency index and flatness factor. These quantifiers help in detecting the passage of bubbles and reveal the hidden structures and patterns in data. Also, the wavelet scalewise analysis of the turbulence at various locations in the column and under different operating conditions could be used to build a direct relationship between the local gas holdup and flatness factor. The methodology is therefore suitable for online evaluation of the trayed bubble column performance and shows promise for developing strategies for improving process performance.

TRAI联合吉西他滨体外诱导人肝内胆管细胞癌细胞凋亡作用的研究

目的:探讨肿瘤坏死因子相关凋亡诱导配体(TRAIL)对人肝内胆管细胞癌细胞HCCC-9810的作用及联合化疗药物吉西他滨(GEM)共同作用人肝内胆管细胞癌细胞对TRAIL抗肿瘤活性的影响。方法:单独应用不同浓度TRAIL(10、30、100、300、1 000 ng/ml),不同浓度GEM(10、20、40、80μg/ml)及100 ng/ml TRAIL+GEM(10、20、40、80μg/ml)联合作用于人肝内胆管细胞癌细胞HCCC-9810,应用四氮唑蓝快速比色(MTT)进行检测,计算肿瘤细胞生长抑制率。结果:GEM与TRAIL联合应用对HCCC-9810细胞抑制率明显高于单独应用TRAIL和GEM(P<0.05)。结论:TRAIL通过诱导肝内胆管细胞癌细胞凋亡而起到抑癌作用,GEM能加强TRAIL的抗癌活性。

快速阅读技巧之三:如何应对生词Coping with difficult words

许多同学在阅读中遇到的最大障碍就是词汇问题。虽然高考阅读理解的文章中对一些超纲词汇附有汉语解释,但仍然会出现一些较难的词汇,这些词汇会在词汇短语题中考查大家。那么,是不是我们对文章中不认识的词汇就无能为力了呢?答案当然是NO!在这部分中,我们将学习猜测生词意思的几个小窍门。窍门一:判断词性请大家阅读下面的文章并完成问题。