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Flow characteristics around a row of circular and wavy cylinders
K. Lam,T. Cai,Y. F. Lin,Y. Liu 대한기계학회 2007 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.21 No.11
The near-wake and flow interference around a row of five circular cylinders, staggered wavy cylinders and nonstaggered wavy cylinders are investigated experimentally by using PIV and LIF techniques. The effects and characteristics of employing wavy cylinders instead of circular cylinders are discussed. The cylinders were arranged at T/d=1.5 with Re ranging from 125 to 40000. Results showed the staggered wavy cylinders give rise to a more stable flow pattern with less fluctuation and longer wake vortex closure length.
A novel lifetime-based phosphor thermography using three-gate scheme and a low frame-rate camera
Cai, T.,Peng, D.,Liu, Y.Z.,Zhao, X.F.,Kim, K.C. Elsevier 2017 Experimental thermal and fluid science Vol.80 No.-
<P>Lifetime-based method using multiple-frame technique and sophisticated high-speed cameras has been developed for two-dimensional phosphor thermography in recent years, which is however limited due to high cost and long time in data processing. In this study, a novel lifetime-based method using three-gate scheme and a low frame-rate camera was proposed, which is able to significantly reduce equipment cost, simplify data processing, and remarkably increase spatial resolution. Here, Mg4FGeO6:Mn was used as sensor material, which was excited by a pulsed UV LED. A low frame-rate CCD camera at 4 Hz was sufficient to conduct phosphor thermometry using a three-gate scheme: one in fully excited region, one in decay region and one for background subtraction. Calibration was performed with a temperature range from 200 degrees C to 550 degrees C, and the results agreed well with data obtained by a high-speed camera sampling at 40 kHz. The effect of exposure time was investigated to yield an optimum value of 2 ms in this study. Finally, this new method was demonstrated in temperature measurements of the steady and impulsively started impingement jet heat transfer. (C) 2016 Elsevier Inc. All rights reserved.</P>
Cai, M.,Phan, P.T.T.,Hong, J.G.,Kim, D.H.,Kim, J.M.,Park, S.J.,Liu, X.,Han, J.E.,Park, H.,Choi, J.W.,Ryu, J.H. North-Holland ; Elsevier Science Ltd 2012 european journal of pharmacology Vol.689 No.1
Eupatilin, a pharmacologically active flavone derived from the Artemisia plant species, has been reported to have anti-oxidant, anti-inflammatory, anti-allergic, and anti-tumor activities. In the present study, we investigated whether eupatilin exhibits neuroprotective activities against ischemia/reperfusion-induced delayed neuronal injury in mice. Transient global cerebral ischemia was induced in mice by bilateral common carotid artery occlusion (BCCAO) for 15min followed by reperfusion for 4 days. Eupatilin (1, 3, or 10mg/kg, p.o.) was administered immediately after the reperfusion. Histochemical studies showed that eupatilin (10mg/kg) increased the number of viable cells detected by Nissl staining and decreased the number of degenerating neuronal cells detected by Fluoro-Jade B staining in the hippocampal CA1 region. Western blotting indicated that eupatilin further increased the level of Akt phosphorylation at 8h after BCCAO. Furthermore, wortmannin, a phosphatidylinositol 3-kinase inhibitor, attenuated the eupatilin-induced increase of Akt phosphorylation. In addition, wortmannin completely reversed the eupatilin-induced neuroprotective effects observed at 4 days after reperfusion. These findings suggest that eupatilin is a promising therapeutic agent against global cerebral ischemia-induced neuronal damage and that its neuroprotective effects may be mediated in part by increased Akt phosphorylation.
A coupled finite element/meshfreemoving boundary method for self-piercing riveting simulation
Cai, Wayne,Wang, Hui-Ping,Wu, C.T. Techno-Press 2013 Interaction and multiscale mechanics Vol.6 No.2
The use of lightweight materials has been steadily increasing in the automotive industry, and presents new challenges to material joining. Among many joining processes, self-piercing riveting (SPR) is particularly promising for joining lightweight materials (such as aluminum alloys) and dissimilar materials (such as steel to Al, and metal to polymer). However, to establish a process window for optimal joint performance, it often requires a long trial-and-error testing of the SPR process. This is because current state of the art in numerical analysis still cannot effectively resolve the problems of severe material distortion and separation in the SPR simulation. This paper presents a coupled meshfree/finite element with a moving boundary algorithm to overcome these numerical difficulties. The simulation results are compared with physical measurements to demonstrate the effectiveness of the present method.