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Kinetic model of Janaki et al.'s bifurcated current sheet : YOON ET AL.
Yoon, P. H.,Janaki, M. S.,Dasgupta, B. American Geophysical Union 2014 JOURNAL OF GEOPHYSICAL RESEARCH. SPACE PHYSICS Vol.119 No.1
Space satellite observations show that current sheets in the space plasma environment are often characterized by bifurcated structures. In a recent paper a two-fluid model of the bifurcated current sheet was constructed on the basis of the pseudo potential method. A straightforward generalization of Janaki et al.'s two-fluid model to kinetic formalism, however, leads to an unphysical situation of negative particle velocity distribution function occurring over a certain range of velocity space. If one assumes an isotropic background plasma population, however, one can show that a rigorous, physically valid kinetic solution of the bifurcated current sheet can be obtained.Key Points<list list-type='bulleted'> <list-item id='jgra50781-li-0001'>Kinetic model of bifurcated current sheet <list-item id='jgra50781-li-0002'>Generalization of Janaki et al's fluid model
Study of Electric Field Stress with Metallic Particle Adhering to FGM Spacer in Three Phase GIS
Janaki Pakalapati,Karthick Nagaraj,Venkata Nagesh Kumar Gundavarapu 한국전기전자재료학회 2021 Transactions on Electrical and Electronic Material Vol.22 No.5
Recently, spacer design is considered as an important factor for the smooth functioning of three phase gas insulated busduct (GIB) to prevent itself from several defects like delamination, void, particle etc. In this paper, a post type spacer with functionally graded material (FGM) has been designed for a three phase GIB with particle and further electric field stress is minimized by inserting metal inserts. FGM post type spacer is spatially distributed with multiple fillers materials to achieve uniform electric field stress using the finite element method. Simulation is carried out with the designed spacer and with a particle as a defect for different FGM gradings and operating voltages. The effect particle with diff erent sizes is minimized with the insertion of the metal insert to the post type FGM spacer and the results obtained are presented and analyzed.
Janaki M.D.S.,Aryaprema V.S.,Fernando N.,Handunnetti S.M.,Weerasena O.V.D.S.J.,Pathirana P.P.S.L.,Tissera H.A. 한국응용곤충학회 2022 Journal of Asia-Pacific Entomology Vol.25 No.3
Understanding local geographical variation in vector density and bionomics related to virus transmission are critical for planning effective vector control programs to control dengue virus transmission. This study investi gated the prevalence and resting behaviour of Aedes aegypti and Ae. albopictus in three dengue high-risk areas in the Colombo District, Sri Lanka. Monthly sampling of resting adult mosquitoes was conducted from August 2019 to February 2020. Thirty-seven percent of the households (289/776) harboured Aedes mosquitoes, and 603 Aedes mosquitoes were collected. The proportion of Ae. aegypti was higher in the overall collection during the collection period (94% [569/603]), and 62% (352/569) were females. Significant monthly variations in Ae. aegypti were observed with respect to the indices: number of females per surveyed house (F/SH; p = 0.001), number of females per Aedes positive house (F/PH; p = 0.029), adult house index (AHI; p = 0.001), adult density (AD; p = 0.005) and resting ratio (RR; p = 0.001). AHI, AD, and RR had statistically significant positive cor relations with monthly rainfall (p = 0.001, p = 0.011, and p = 0.002 respectively) and one-month lagged dengue cases (p = 0.002, p = 0.005, and p < 0.001 respectively). A statistically significantly higher proportion of Ae. aegypti females were caught resting indoors (N = 309, 88%) than outdoors (N = 43, 12%; p < 0.001). The most common resting areas were bedrooms (51%) & living/dining rooms (37%), and places were under or on furniture (47%) & hangings (34%) for Ae. aegypti. Conversely, 74% of female Ae. albopictus were collected outdoors. Re sults of this study could have strong implications to improve vector surveillance and control by early detection of dengue to detect outbreaks and minimization of disease transmission.
Design of Robust Current Controller Using GA for Three Level 24-Pulse VSC Based STATCOM
Janaki, M.,Thirumalaivasan, R.,Prabhu, Nagesh The Korean Institute of Power Electronics 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.3
A STATic synchronous COMpensator (STATCOM) is a shunt connected voltage source converter (VSC) based FACTS controller using Gate Turn Off (GTO) power semiconductor devices employed for reactive power control. The operation principal is similar to that of a synchronous condenser. A typical application of a STATCOM is voltage regulation at the midpoint of a long transmission line for the enhancement of power transfer capability and/or reactive power control at the load centre. This paper presents the modeling of STATCOM with twenty four pulse three level VSC and Type-1 controller to regulate the reactive current or the bus voltage. The performance is evaluated by transient simulation. It is observed that, the STATCOM shows excellent transient response to step change in the reactive current reference. While the eigenvalue analysis is based on D-Q model, the transient simulation is based on both D-Q and 3 phase models of STATCOM (which considers switching action of VSC).
Design of Robust Current Controller Using GA for Three Level 24-Pulse VSC Based STATCOM
M. Janaki,R. Thirumalaivasan,Nagesh Prabhu 전력전자학회 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.3
A STATic synchronous COMpensator (STATCOM) is a shunt connected voltage source converter (VSC) based FACTS controller using Gate Turn Off (GTO) power semiconductor devices employed for reactive power control. The operation principal is similar to that of a synchronous condenser. A typical application of a STATCOM is voltage regulation at the midpoint of a long transmission line for the enhancement of power transfer capability and/or reactive power control at the load centre. This paper presents the modeling of STATCOM with twenty four pulse three level VSC and Type-1 controller to regulate the reactive current or the bus voltage. The performance is evaluated by transient simulation. It is observed that, the STATCOM shows excellent transient response to step change in the reactive current reference. While the eigenvalue analysis is based on D-Q model, the transient simulation is based on both D-Q and 3 phase models of STATCOM (which considers switching action of VSC).
Spondylodiscitis Complicated by the Ingestion of a Button Battery: a Case Report
Praharaju Janaki Sudhakar,Jameela Al-Dossary,Neelam Malik 대한영상의학회 2008 Korean Journal of Radiology Vol.9 No.6
A one-and-a-half year old boy who presented with a cough, irritability, and refusal of food was found to have an impacted foreign body in his upper esophagus. We present the radiologic findings of the foreign body (a button battery) impacted in the upper esophagus and its complications; namely, mediastinitis and spondylodiscitis after endoscopic removal. Further, plain radiograph and MR imaging findings are discussed along with literature review. A one-and-a-half year old boy who presented with a cough, irritability, and refusal of food was found to have an impacted foreign body in his upper esophagus. We present the radiologic findings of the foreign body (a button battery) impacted in the upper esophagus and its complications; namely, mediastinitis and spondylodiscitis after endoscopic removal. Further, plain radiograph and MR imaging findings are discussed along with literature review.