نتایج جستجو برای: piv

تعداد نتایج: 2794  

Journal: :journal of computational & applied research in mechanical engineering (jcarme) 2012
r. mestiri* f. aloui s. ben nasrallah

the technique used to control the airflow is based on the electro-hydrodynamic actuator which is also called plasma actuator. this actuator ensures the airflow control thanks to the electric wind created by the electrical corona discharge. this ionic wind is developed at the profile surface tangential to the initial free airflow so that it has a significant effect on the boundary layer flow. th...

Journal: :Journal of virology 2010
Dana Ravid George P Leser Robert A Lamb

Caveolin 1 (Cav-1) is an integral membrane protein that forms the coat structure of plasma membrane caveolae and regulates caveola-dependent functions. Caveolae are enriched in cholesterol and sphingolipids and are related to lipid rafts. Many studies implicate rafts as sites of assembly and budding of enveloped virus. We show that Cav-1 colocalizes with the paramyxovirus parainfluenza virus 5 ...

2000
A. LEHR A. BÖLCS

In the present paper a study of the time dependent transonic flow field around a single compressor blade in a Laval nozzle is presented. For the investigation the PIV method has been employed because of its ability to deliver instantaneous flow field information across an illuminated plane with high spatial and temporal resolution. From these instantaneous PIV measurements the mean velocity fie...

Journal: :Journal of biomechanical engineering 2004
Pramote Hochareon Keefe B Manning Arnold A Fontaine John M Tarbell Steven Deutsch

In order to bridge the gap of existing artificial heart technology to the diverse needs of the patient population, we have been investigating the viability of a scaled-down design of the current 70 cc Penn State artificial heart. The issues of clot formation and hemolysis may become magnified within a 50 cc chamber compared to the existing 70 cc one. Particle image velocimetry (PIV) was employe...

2015
Pramod Chamarthy S V. Garimella Steven T. Wereley Suresh V. Garimella

μPIV is a widely accepted tool for making accurate measurements in microscale flows. The particles that are used to seed the flow, due to their small size, undergo Brownian motion which adds a random noise component to the measurements. Brownian motion introduces an undesirable error in the velocity measurements, but also contains valuable temperature information. A PIV algorithm which detects ...

Journal: :Molecular and cellular biology 2002
Ann C Morris Guy W Beresford Myesha R Mooney Jeremy M Boss

Chromatin immunoprecipitation assays were employed to assess the kinetics of transcription factor assembly and histone modifications that occur during gamma interferon (IFN-gamma) induction of CIITA gene expression. CIITA is the master regulator of major histocompatibility complex class II transcription. Promoter IV (PIV), the major IFN-gamma responsive promoter for CIITA expression, requires b...

Journal: :Journal of the Chinese Medical Association : JCMA 2012
Chien-Chih Tseng Hsing-I Wang Peng-Hui Wang Ming-Jie Yang Chi-Mou Juang Huann-Cheng Horng Yi-Cheng Wu Chia-Chien Chen Huei-Ling Shiu Mei-Mei Chiang Huei-Jie Lin Chih-Yao Chen Kuan-Chong Chao

BACKGROUND To investigate flow in the ductus venosus at 11-13 + 6 weeks of gestation in women with normal pregnancies in the Taiwanese population. METHODS Two hundred and fifty-two normal singleton pregnancies with gestational ages ranging from 11 to 13 + 6 weeks were examined in this study. The pulsatility index for veins (PIV), resistance index (RI), peak velocity during ventricular systole...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2005
Zuyao Ni Elizabeth Karaskov Tao Yu Steven M Callaghan Sandy Der David S Park Zhaodong Xu Samantha G Pattenden Rod Bremner

IFN-gamma induction of the CIITA (class II transactivator) promoter (pIV) requires Brahma-related gene 1 (BRG1), a chromatin-remodeling enzyme. However, the events that lead to pIV activation are only partially understood, and the point at which BRG1 acts is unknown. The first IFN-gamma-induced event triggers nuclear translocation of STAT1 (signal transducer and activator of transcription 1), w...

2010
Thien Duy Nguyen John Craig Wells Chuong Vinh Nguyen

In investigations of laminar or turbulent flows, wall shear is often important. Nevertheless, conventional particle image velocimetry (PIV) is difficult in near-wall regions. A near-wall measurement technique, named interfacial PIV (IPIV) [Nguyen, C., Nguyen, T., Wells, J., Nakayama, A., 2008. Proposals for PIV of near-wall flow over curved boundaries. In: Proceedings of 14th International Symp...

2000
Naoki TANI Michitsugu MORI Koichi HISHIDA Masanobu MAEDA

The present work involves the development of a particle imaging velocimetry system using an optical fiber bundle scope as shown in Figure 1. Applying a fiber scope to PIV system, the resolution of particle images is spatially poorer than those taken directly by a CCD camera, which leads to an inadequate result of cross-correlation between a pair of particle images from the fiber scope. With a c...

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