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Flow field generated by a dielectric barrier discharge plasma actuator in quiescent air at initiation stage

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chinese journal of Aeronautics 2021年第3期34卷 13-24页

作者： Xin ZHANG Y.D.cUI chien Ming jonathan tay B.c.KHOO State Key Laboratory of Aerodynamics China Aerodynamics Research and Development CenterMianyang 621000China National University of Singapore Singapore 119260Singapore

A single Dielectric Barrier Discharge(DBD) plasma actuator driven by Alternating current(Ac) power, capable of inducing a starting vortex and a wall jet in quiescent air, is suited for low-Reynolds-number flow control. However, the starting vortex and the wall jet are usually observed after the plasma actuator has been operated for dozens of and hundreds of cycles of the voltage, respectively. The detail of the induced flow field at the initiation stage of the plasma actuator has rarely been addressed. At the initiation stage, a thin jet that provides the impetus for the entrainment of the induced flow at the beginning of the plasma actuation is first observed by using a high-accuracy phase-lock Schlieren technique and a high-speed Particle Image Velocimetry(PIV) system. This is the initial form of the momentum transfer from the plasma to the ***, an arched type jet is created by the plasma actuator. In addition, the whole development process of the induced flow field from the starting point of the thin jet to the quasi-steady stage of wall jet is presented for providing a comprehensive understanding of the plasma actuator and proposing a relevant enhancement of the numerical simulation model.

关键词： Dielectric barrier discharge Particle image velocimetry Plasma actuator Schlieren technique Wall jet

Quality Guided Phase Unwrapping for Fringe Projection Profilometry

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实验力学 2006年第1期21卷 71-76页

作者： c.j.tay Department of Mechanical Engineering National University of Singapore 10 Kent Ridge Crescent Singapore 119260

Fringe projection technique is a non-contact, full field 3-D shape measurement method. The object depth information is recorded in one or several deformed fringe patterns. The phase-shifting algorithm or the Fourier transform method can be used to extract the wrapped phase data. A phase unwrapping process is then applied to retrieve a continuous phase distribution, which represents the surface profile of the test object. In this paper, a quality-guided phase unwrapping approach is incorporated and two novel phase quality evaluation methods are proposed to facilitate the phase unwrapping process.

关键词：相品质相展开边缘发射相移傅立叶变换

Possibilities and impossibilities of magnetic nanoparticle use in the control of infectious biofilms

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journal of Materials Science & Technology 2021年第10期69卷 69-78页

作者： Kecheng quan Zexin Zhang Yijin Ren Henk j.Busscher Henny c.van der Mei Brandon W.Peterson college of chemistry Chemical Engineering and Materials ScienceSoochow UniversitySuzhou215123China University of Groningen and University Medical center Groningen Department of Biomedical Engineering9713 AVGroningenthe Netherlands University of Groningen and University Medical center Groningen Department of OrthodonticsHanzeplein 19713 GZGroningenthe Netherlands

Targeting of chemotherapeutics towards a tumor site by magnetic nanocarriers is considered promising in *** nanoparticles are also considered for use in infection-control as a new means to prevent antimicrobial resistance from becoming the number one cause of death by the year *** this end,magnetic nanoparticles can either be loaded with an antimicrobial for use as a delivery vehicle or modified to acquire intrinsic antimicrobial *** nanoparticles can also be used for the local generation of heat to kill infectious *** appealing for tumor-and infectioncontrol,injection in the blood circulation may yield reticuloendothelial uptake and physical obstruction in organs that yield reduced targeting *** can be prevented with suitable surface ***,precise techniques to direct magnetic nanoparticles towards a target site are *** problem of precise targeting is aggravated in infection-control due to the micrometer-size of infectious biofilms,as opposed to targeting of nanoparticles towards centimeter-sized *** review aims to identify possibilities and impossibilities of magnetic targeting of nanoparticles for *** first review targeting techniques and the spatial resolution they can achieve as well as surface-chemical modifications of magnetic nanoparticles to enhance their targeting efficiency and antimicrobial *** is concluded that targeting problems encountered in tumor-control using magnetic nanoparticles,are neglected in most studies on their potential application in *** biofilm targeting by smart,self-adaptive and pH-responsive,antimicrobial nanocarriers for instance,seems easier to achieve than magnetic *** leads to the conclusion that magnetic targeting of nanoparticles for the control of micrometer-sized infectious biofilms may be less promising than initially ***,using propulsion rather than pr

关键词： Magnetic nanoparticles Magnetic targeting Biofilm Infection Antimicrobials

Improved mechanical properties and strengthening mechanism with the altered precipitate orientation in magnesium alloys

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journal of Magnesium and Alloys 2022年第5期10卷 1256-1267页

作者： Y.j.Wan Y.Zeng Y.c.Dou D.c.Hu X.Y.Qian Q.Zeng K.X.Sun G.F.quan Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Material Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China college of Materials Science and Engineering Sichuan University of Science and EngineeringZigong 643000China Department of Materials The University of ManchesterOxford RoadManchester M139PLUnited Kingdom

Aging prior to twinning deformation was proposed to alter the precipitate orientation of the plate-shapedβ-MgAlfrom(0002)basal planes(named basal plates)to■prismatic planes(named prismatic plates)in AZ31 Mg *** experimental results showed that the compressive yield strength(cYS)of the sample containing prismatic plates increased 40 MPa and the compression ratio raised by 22%compared to that containing basal *** underlying strengthening mechanism was analyzed via a yield strengthen(YS)model with a function of grain size,precipitate characters(size,oritention,fraction)and Schmid factor(SF).It revealed that the improvement of cYS was mainly attributed to the altered precipitate orientation and refined grain size produced by twinning ***,the prismatic plates always have a stronger hardening effect on basal slip than basal plates under the same varites of precipitate diameter and ***,the decreased cRSS ratio of prismatic slip to basal slip revealed that the activity of non-basal slip in Mg alloy might be *** activated slip systems provided more mobile dislocations,contributing to the large compression ratio of the Mg rolled sheet with prismatic plates.

关键词： Precipitate orientation Precipitation strengthening Grain boundary strengthening Yield strength model

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基于正弦条纹投影的三维传感及其去包裹处理

光学学报 2001年第12期21卷 1444-1447页

作者：康新何小元 quan c 东南大学工程力学系南京210096 新加坡国立大学机械工程系新加坡119260

采用液晶显示 (LcD)投影仪产生的正弦条纹 ,用四步相移技术对物体进行了三维形貌测量 ,重点讨论了去包裹问题 ,对大面积相位间断区的模板标识及含离散相位间断点条纹图的去包裹问题提出了新的处理方法。

关键词：正弦条纹投影三维传感液晶显示投影仪四步相移法去包裹测量原理光学测量点状噪声

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基于最小截面差的相位展开

中国激光 2002年第7期29卷 647-651页

作者：新何小元 c.quan 东南大学工程力学系南京210096 新加坡国立大学机械工程系新加坡119260

相位展开 (PhU)问题从理论上讲是一个不适定问题。根据被测物理量的整体连续性 ,提出了一种基于最小截面差的相位展开方法。理论分析和对实验条纹图的处理结果表明 ,该方法特别适合于具有相位间断大于π ,条纹欠采样及随机噪声等条纹图... 详细信息

相位展开 (PhU)问题从理论上讲是一个不适定问题。根据被测物理量的整体连续性 ,提出了一种基于最小截面差的相位展开方法。理论分析和对实验条纹图的处理结果表明 ,该方法特别适合于具有相位间断大于π ,条纹欠采样及随机噪声等条纹图的相位展开。同支切 (Branchcuts)法相比 ,该方法具有算法简单、计算量小且可靠度高的特点 ,具有一定的实用性。

关键词：相位展开最小截面差形貌测量条纹图

High-performance photodetectors based on two-dimensional perovskite crystals with alternating interlayer cations

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journal of Materiomics 2023年第4期9卷 817-823页

作者： Yezhan Li Zhengxun Lai You Meng Wei Wang Yuxuan Zhang Xuwen Zhao Di Yin Weijun Wang Pengshan Xie quan quan SenPo Yip johnny c.Ho Department of Materials Science and Engineering City University of Hong Kong999077Hong Kong SARChina Institute for Materials chemistry and Engineering Kyushu UniversityFukuoka816-8580Japan State Key Laboratory of Terahertz and Millimeter Waves City University of Hong Kong999077Hong Kong SARChina

Organic-inorganic halide perovskite,as a low-cost,solution-processable material with remarkable optoelectronic properties,is ideal candidate to fabricate high-performance photodetectors and is expected to significantly reduce device *** to the common Dion-jacobson and Ruddlesden-Popper two-dimensional(2D)layered hybrid perovskite compounds,the perovskites with alternating cations in the interlayer(AcI)phase show higher crystal symmetry and narrower optical bandgaps,which exhibit great potential for excellent photodetection ***,we report a high-performance photodetector based on the 2D bilayered hybrid lead halide perovskite single crystal with the AcI phase(GAMA_(2)Pb_(2)I_(7);GA=c(NH_(2))_(3)and MA=cH_(3)NH_(3)).The single-crystal photodetector exhibits high photoresponsivity of 1.56,2.54,and 2.60 A/W for incident light wavelengths of 405,532,and 635 nm under 9.82 nW,respectively,together with the correspondingly high detectivity values of 1.86×10^(12),3.04×10^(12),and 3.11×10^(12)jones under the same operating ***,a high-resolution imaging sensor is built based on the GAMA_(2)Pb_(2)I_(7)single-crystal photodetector,confirming the high stability and photosensitivity of the imaging *** results show that the 2D hybrid lead halide perovskites with alternating interlayer cations are promising for high-performance visible light photodetectors and imaging systems.

关键词： Photodetector Two-dimensional Hybrid perovskite Alternating interlayer cation Imaging

Regulation of blood-testis barrier dynamics by the mT0Rcl/rpS6 signaling complex:an in vitro study

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Asian journal of Andrology 2019年第4期21卷 365-374页

作者： Lin-Xi Li Si-Wen Wu Ming Yan Qing-quan Lian Ren-Shan Ge c Yan cheng The Second Affiliated Hospital and Yuying children's Hospital Wenzhou Medical University Wenzhou 325027 China The Mary M. Wohlford Laboratory for Male contraceptive Research Center for Biomedical Research Population Council New York NY 10065 USA jiangsu Key Laboratory of Drug Screening China Pharmaceutical University Nanjing 210009 China

During spermatogenesis, developi ng germ cells that lack the cellular ultrastructures of filopodia and lamellipodia gen erally found in migrating cells, such as macrophages and fibroblasts, rely on Sertoli cells to support their transport across the seminiferous epithelium. These in elude the transport of preleptote ne spermatocytes across the blood-testis barrier (BTB), but also the transport of germ cells, in particular developing haploid spermatids, across the seminiferous epithelium, that is to and away from the tubule lumen, depending on the stages of the epithelial cycle. On the other hand, cell junctions at the Sertoli cell-cell and Sertoli-germ cell in terface also un dergo rapid remodeli ng, invo Iving disassembly and reassembly of cell j un ctions, which, in turn, are supported by actin- and microtubule-based cytoskeletal remodeling. Interestingly, the underlying mechanism(s) and the invoIving biomolecule(s) that regulate or support cytoskeletal remodeling remain largely unknown. Herein, we used an in vitro model of primary Sertoli cell cultures that mimicked the Sertoli BTB in vivo overexpressed with the ribosomal protei n S6 (rpS6, the down stream signali ng protein of mammalian target of rapamycin complex 1 [mTORcl]) cloned into the mammalian expression vector pcI-neo, namely, quadruple phosphomimetic and constitutively active mutant of rpS6 (pcI-neo/p-rpS6-MT) versus pcI-neo/rpS6-WT (wild-type) and empty vector (pcI-neo/ctrl) for studies. These findings provide compelling evidence that the mT0Rcl/rpS6 signal pathway exerted its effects to promote Sertoli cell BTB remodeling. This was mediated through changes in the organization of actin- and microtubulebased cytoskeletons, involving changes in the distribution and/or spatial expression of actin- and microtubule-regulatory proteins.

关键词： blood-testis barrier F-actin microtubule mTORcl rpS6 Sertoli cells testis

Reuse of liver grafts following the brain death of the initial recipient

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World journal of Hepatology 2014年第6期6卷 443-447页

作者： Hideaki Tanaka Vivian c McAlister Mark A Levstik cameron N Ghent Paul j Marotta Douglas quan William j Wall Multi-Organ Transplant Program London Health Sciences CentreLondonOntario N6A 5A5Canada Department of Pediatric Surgery Faculty of MedicineUniversity of TsukubaTsukuba CityIbaraki 305-8575Japan canadian Armed Forces Health Service OttawaOntario K1A 0K2Canada

AIM: To determine if there is a reasonable prospect of success of a re-use liver ***: We systematically searched for reports of liver graft re-use using electronic searches of PubMed and Web of Knowledge. We performed hand searches of references lists of articles reporting re-use of ***: A systematic review of the literature reveals 28 liver transplantations using previously transplanted grafts. First and second recipients ranged in age from 4 to 72 years and 29 to 62 years respectively. Liver disease in the first recipient was varied including 5(18%) patients with fulminant liver failure who died subsequently of cerebral edema. The second transplanta-tion was performed after a median interval of 5 d(one day-13 years). Viral hepatitis was present in 3(11%) of the initial recipients and in 8(29%) of final recipients. Hepatocellular carcinoma was present in 6(21%) of the final recipients. Early survival after the final transplantation was 93%, whereas long-term survival was 78% with a mean follow-up of 23.3(3-120) ***: Outcomes of transplantation using previously transplanted grafts in this select population are similar to those seen with conventional grafts.

关键词： Reuse Liver graft Brain death Liver transplantation