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Bhaskaran Prathish Raaja,Rathnam Joseph Daniel,Koilmani Sumangala 한국전기전자재료학회 2017 Transactions on Electrical and Electronic Material Vol.18 No.2
Cantilever beam MEMS piezoelectric accelerometers are the simplest and most widely used accelerometerstructure. This paper discusses the design of a piezoelectric accelerometer exclusively for SHM applications. Whilesuch accelerometers need to operate at a lower frequency range, they also need to possess high sensitivity andlow noise floor. The availability of a simple model for deflection, charge, and voltage sensitivities will make theaccelerometer design procedure less cumbersome. However, a review of the open literature suggests that such amodel has not yet been proposed. In addition, previous works either depended on FEM analysis or only reported onthe fabrication and characterization of piezoelectric accelerometers. Hence, this paper presents, for the first time, asimple analytical model developed for the deflection, induced voltage, and charge sensitivity of a cantilever beampiezoelectric accelerometer.The model is then verified using FEM analysis for a range of different cases. Further,the model was validated by comparing the induced voltages of an accelerometer estimated using this model withexperimental voltages measured in the accelerometer after fabrication. Subsequently, the design of an accelerometeris demonstrated for SHM applications using the analytical model developed in this work. The designed accelerometerhas 60 mV/g voltage sensitivity and 2.4 pC/g charge sensitivity, which are relatively high values compared to those ofthe piezoresistive and capacitive accelerometers for SHM applications reported earlier.
Raaja, Bhaskaran Prathish,Daniel, Rathnam Joseph,Sumangala, Koilmani The Korean Institute of Electrical and Electronic 2017 Transactions on Electrical and Electronic Material Vol.18 No.2
Cantilever beam MEMS piezoelectric accelerometers are the simplest and most widely used accelerometer structure. This paper discusses the design of a piezoelectric accelerometer exclusively for SHM applications. While such accelerometers need to operate at a lower frequency range, they also need to possess high sensitivity and low noise floor. The availability of a simple model for deflection, charge, and voltage sensitivities will make the accelerometer design procedure less cumbersome. However, a review of the open literature suggests that such a model has not yet been proposed. In addition, previous works either depended on FEM analysis or only reported on the fabrication and characterization of piezoelectric accelerometers. Hence, this paper presents, for the first time, a simple analytical model developed for the deflection, induced voltage, and charge sensitivity of a cantilever beam piezoelectric accelerometer.The model is then verified using FEM analysis for a range of different cases. Further, the model was validated by comparing the induced voltages of an accelerometer estimated using this model with experimental voltages measured in the accelerometer after fabrication. Subsequently, the design of an accelerometer is demonstrated for SHM applications using the analytical model developed in this work. The designed accelerometer has 60 mV/g voltage sensitivity and 2.4 pC/g charge sensitivity, which are relatively high values compared to those of the piezoresistive and capacitive accelerometers for SHM applications reported earlier.
A. Bhaskaran,라그하반,R. MohanKumar,R. Jayavel 한국물리학회 2010 Current Applied Physics Vol.10 No.5
Non-linear optical manganese mercury teterathiocyanate glycol monomethyl ether [MnHg(SCN)4(C3H8O2)] compound was synthesized and single crystals were grown from water-glycol monomethyl ether (1:1) mixed solvent by slow cooling method. Structure and crystallinity of the grown crystal were confirmed by both single crystal and powder X-ray diffraction analysis. Presence of functional groups and coordination of glycol monomethyl ether and thiocyanate in MMTG were confirmed by FT-IR analysis. Optical transmittance and second harmonic generation of the grown crystal were studied by UV–Vis spectrum and Kurtz powder technique. A dielectric study was performed on the MMTG single crystal to study the power dissipation of the material in the presence of alternating electric field. Mechanical behaviour was analysed using Vicker’s microhardness test. Optical surface damage measurement was carried out to confirm the suitability of MMTG crystal for NLO applications.
Ventricular Tachycardia Ablation in Non-ischemic Cardiomyopathy
Ashwin Bhaskaran,Kasun De Silva,Karan Rao,Timothy Campbell,Ivana Trivic,Richard G. Bennett,Eddy Kizana,Saurabh Kumar 대한심장학회 2020 Korean Circulation Journal Vol.50 No.3
Non-ischemic cardiomyopathies are a heterogeneous group of diseases of the myocardium that have a distinct proclivity to ventricular arrhythmias. Of these, ventricular tachycardias pose significant management challenges with the risk of sudden cardiac death and morbidity from multiple causes. Catheter ablation of ventricular tachycardias is becoming an increasingly utilised intervention that has been found to have significant benefits with improving symptoms, reducing anti-arrhythmic drug burden and debilitating device therapies, thereby improving quality of life. Nonetheless, the approach to the ablation of ventricular tachycardias in non-ischemic cardiomyopathies is governed heavily by the disease process, with several distinct differences from ischemic cardiomyopathy including a preponderance to epicardial and deep intramural substrate. This contemporary review aims to present the various disease processes within non-ischemic cardiomyopathies, catheter ablation techniques which have been developed to target ventricular tachycardia and more novel adjunctive therapeutic measures.
Monitoring of hard turning using acoustic emission signal
J. Bhaskaran,M. Murugan,N. Balashanmugam,M. Chellamalai 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.2
Monitoring of tool wear during hard turning is essential. Many investigators have analyzed the acoustic emission (AE) signals generated during machining to understand the metal cutting process and for monitoring tool wear and failure. In the current study on hard turning,the skew and kurtosis parameters of the root mean square values of AE signal (AERMS) are used to monitor tool wear. The rubbing between the tool and the workpiece increases as the tool wear crosses a threshold, thereby shifting the mass of AERMS distribution to right,leading to a negative skew. The increased rubbing also led to a high kurtosis value in the AERMS distribution curve.
Anju Sasidharan,Nishanth Kumar Sasidharan,Dileepkumar Bhaskaran Nair Saraswathy Amma,Radhakrishnan Kokkuvayil Vasu,Anupama Vijaya Nataraja,Krishnakumar Bhaskaran 한국미생물학회 2015 The journal of microbiology Vol.53 No.10
A novel strain of Chromobacterium sp. NIIST (MTCC 5522) producing high level of purple blue bioactive compound violacein was isolated from clay mine acidic sediment. During 24 h aerobic incubation in modified Luria Bertani medium, around 0.6 g crude violacein was produced per gram of dry weight biomass. An inexpensive method for preparing crystalline, pure violacein from crude pigment was developed (12.8 mg violacein/L) and the pure compound was characterized by different spectrometric methods. The violacein prepared was found effective against a number of plant and human pathogenic fungi and yeast species such as Cryptococcus gastricus, Trichophyton rubrum, Fusarium oxysporum, Rhizoctonia solani, Aspergillus flavus, Penicillium expansum, and Candida albicans. The best activity was recorded against Trichophyton rubrum (2 μg/ml), a human pathogen responsible for causing athlete’s foot infection. This is the first report of antifungal activity of purified violacein against pathogenic fungi and yeast.
라그하반,A. Bhaskaran,R. Sankar,R. Jayavel 한국물리학회 2010 Current Applied Physics Vol.10 No.2
Single crystals of cadmium mercury thiocyanate glycol monomethyl ether (CMTG) were grown from a mixed solvent of glycol monomethyl ether (GME):water (1:1) by slow evaporation method. The crystal structure and morphology were confirmed by single crystal X-ray diffraction analysis. Presence of functional groups and the coordination of glycol monomethyl ether (GME) and thiocyanate (SCN-) in the CMTG compound were confirmed by FT-IR analysis. Optical transparency of the grown crystal was studied by UV–Vis spectroscopy. Thermal stability and decomposition process were studied by means of TGA and DTA analysis. Dielectric measurement on CMTG single crystal was carried out for various frequency and temperatures. The surface studies by scanning electron microscopy reveals the formation of layer growth pattern indicative of 2D nucleation mechanism. From the second harmonic output power measurement by Kurtz powder method, it is observed that CMTG is a potential material for nonlinear optical applications among the bimetallic thiocyanate adducts series.
Site Suitability Assessment for Joint Forest Management(JFM) - a Geospatial Approach
Jayakumar, S.,Ramachandran, A.,Bhaskaran, G.,Heo, Joon,Kim, Woo-Sun The Korean Society of Remote Sensing 2007 大韓遠隔探査學會誌 Vol.23 No.5
Joint Forest Management(JFM) is a concept of developing partnerships between fringe forest user groups and the Forest Department(FD) on the basis of mutual trust and jointly defined roles and responsibilities with regard to forest protection and development. In India, JFM was started during 1992 and it was implemented in many states. However success rate of JFM activity was not promising. Though there are many factors attributed to the failures, one of the main factors is the JFM site. This paper deals with the significant ground works to be done before planning for JFM using recent technologies such as remote sensing(RS) and Geographic Information System(GIS). Also it deals with the advantages of weighted overlay analysis in selecting suitable sites for JFM taking into consideration the various criteria. As a result of weighted overlay analysis, there were four types of suitability classes viz., less, moderate, highly and un-suitable. The moderately suitable class occupied maximum area(13209.64 ha) than less and highly suitable classes. If JFM is implemented on the suitability area, then the failure could be avoided in the future.