[Determination of 40 carbonyl compounds in ambient air by high performance liquid chromatography-triple quadrupole mass spectrometry]. [PDF]
Se PuLi GH +8 more
europepmc +1 more source
[Determination of 16 organic ultraviolet absorbers in drinking water by solid phase extraction-ultra-high performance liquid chromatography-tandem mass spectrometry]. [PDF]
Se PuWang Z, Zhao C, Ye BX, Chen YY.
europepmc +1 more source
Heterogeneity of Gas-Solid Two-Phase Flow in Circulating Fluidized Beds
, 1999 本文研究循环流化床提升管内气固流动的不均匀特性和动态行为。从单个颗粒在气流中的受力分析和运动描述等微观尺度的动力学分析出发，采用激光相位多普勒（PDPA）、随机分析和分形理论，从基础实验测量、分析模拟与改善流动不均匀性的技术措施等方面对提升管气固流动的非均匀特性进行了探讨。研究获得了二维床提升管中气粒两相轴、侧两向时均速度。均方根脉动速度以及气固滑移速度的截面分布；提出了颗粒对流体脉动强弱影响的新认识；发现了局部粒速动态行为的分数维变化特征与流动状态间的对应关系 ...
孙国刚
core
[Preparation of mesoporous covalent organic framework core-shell stationary phase and its application in the analysis of astragaloside Ⅳ content in <i>Astragalus</i>]. [PDF]
Se PuZhao XY +7 more
europepmc +1 more source
, 2002 利用氢气泡技术测量了剪切水-气界面下二维瞬时流速的分布,根据从流动显示图像获得的流速剖面样本,考察水面附近湍流场的平均特性,重点分析猝发事件的信号特征。氢气泡方法较为准确地测定了水流中平均流速、湍流脉动强度以及Reynolds切应力的分布,更重要的是,它能将流动显示图像中观察到猝发事件与定量的信号特征直接联系起来.在猝发过程中,水面近区的流向和垂向瞬时速度以及Reynolds切应力出现较大幅度的脉动,它们与低速流体条带的喷射行为对应;大幅度脉动在时间和空间垂直方向上表现出高度的相干性 ...
王双峰, 赵建福, 贾复
core
, 2004 通过实验研究了受气流剪切但无明显波动的水气界面下的湍流特性。当界面剪切较强(ur≥0．20cm／s)时，水面边界层中平均流速、速度脉动强度和Reynolds切应力的分布形状与固壁湍流相似，预示剪切水气界面和固壁附近的湍流相干结构是相类似的。另一方面，水面湍流也表现出不同于固壁湍流的细节特征。与自由面湍流不同的是 ...
王双峰, 王晋军, 贾复
core
[Joint trajectories and evolution patterns of direct and indirect maternal mortality across 204 countries from 2000 to 2021]. [PDF]
Beijing Da Xue Xue Bao Yi Xue BanZhou Y, Cheng Z, Feng X.
europepmc +1 more source
[Short-term effectiveness of visual treatment solution-assisted treatment for Crowe type <b>Ⅲ</b>- <b>Ⅳ</b> developmental dysplasia of the hip]. [PDF]
Zhongguo Xiu Fu Chong Jian Wai Ke Za ZhiTie M +6 more
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[Orthopedic treatment strategy for hemophilic pseudotumor]. [PDF]
Zhongguo Xiu Fu Chong Jian Wai Ke Za ZhiLi J +6 more
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[Safety and Clinical Benefit Analysis of No-chest-tube Strategy After Uniportal Video-assisted Thoracoscopic Pulmonary Wedge Resection Based on Propensity Score Matching]. [PDF]
Zhongguo Fei Ai Za ZhiLin C +7 more
europepmc +1 more source