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Diagnostic efficacy of Ziehl-Neelsen method against fluorescent microscopy in detection of acid fast bacilli

Asian Pacific Journal of Tropical Medicine 2010年第4期3卷 328-329页

作者： soham gupta Vishnu Prasad Shenoy Indira Bairy Muralidharan S Department of Microbiology St.Johns Medical CollegeBangaloreKarnatakaIndia 560034 Department of Microbiology Kasturba Medical collegeManipalKarnatakaIndia 576104

Objective:To investigate the application of Ziehl-Neelsen(Z-N) and fluorescent microscopy in detection of acid fast bacilli(AFB).Methods:Duplicate smears were prepared from 260 sputum samples and stained with Z-N and fluorescent staining(FS) *** efficiency of both methods in primary diagnosis of tuberculosis were ***:The smears were positive for AFB in 15(5.77%) samples by Z-N staining method and in 16(6.15%) samples by FS *** sensitivity and specificity of Z-N staining method against FS method were 93.75% and 100%***:Though lesser cost-effective than Z-N,FS method is a more sensitive and better case finding tool in detection of AFB.

关键词： Tuberculosis Acid fast bacilli Ziehl-Neelsen Fluorescent microscopy

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Active Flow Control of a Low Reynolds Number S809 Wind Turbine Blade Model under Dynamic Pitching Maneuvers

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Open Journal of Fluid Dynamics 2017年第2期7卷 178-193页

作者： Victor Maldonado soham gupta Department of Mechanical Engineering University of Texas at San Antonio San Antonio TX USA Department of Aerospace Engineering and Mechanics University of Alabama Tuscaloosa AL USA

A low Reynolds number wind turbine blade model based on the S809 airfoil was tested in a subsonic wind tunnel to study the structural vibration of the blade under dynamic pitching maneuvers. Piezoelectric-based synthetic jet actuators were embedded inside the blade and activated with a synthetic jet momentum coefficient, Cμ of 2.30 × 10-3. Structural vibration was quantified for a range of unsteady angles undergoing “pitch up and down” and “sinusoidal pitch” maneuvers at a Reynolds number of 5.28 × 104. The blade tip deflection amplitude and frequency were acquired utilizing a pair of strain gauges mounted at the root of the model. Using active flow control vibration reduction was more effective during the pitch up portion of the blade motion cycle compared to the pitch down portion. This effect is due to dynamic stall, where a leading edge vortex is shed during the pitch up motion and contributes to higher lift compared to static angles of attack and lower lift when the blade is pitched down. Dynamic stall was measured with phase-locked stereoscopic particle image velocimetry (SPIV), where global mean flow measurements reveal a shift in location and reduction in the size of a recirculating flow structure near the suction surface of the blade during the pitch up motion compared to the pitch down.

关键词： Active Flow Control Structural Vibration Dynamic Stall

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