Sri Meenakshi Government Arts College for Women

Madurai, India

Sri Meenakshi Government Arts College for Women

Madurai, India
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Selvarani G.,Sri Meenakshi Government Arts College for Women | Shanmugaraju A.,Arul Anandar College | Vrsnak B.,Hvar Observatory | Lawrance M.B.,SRM University
Solar Physics | Year: 2017

We perform a statistical analysis on 157 M-class soft X-ray flares observed during 1997 – 2014 with and without deca-hectometric (DH) type II radio bursts aiming at the reasons for the non-occurrence of DH type II bursts in certain events. All the selected events are associated with halo Coronal Mass Ejections (CMEs) detected by the Solar and Heliospheric Observatory (SOHO) / Large Angle Spectrometric and COronograph (LASCO). Out of 157 events, 96 (61%; “Group I”) events are associated with a DH type II burst observed by the Radio and Plasma Wave (WAVES) experiment onboard the Wind spacecraft and 61 (39%; “Group II”) events occur without a DH type II burst. The mean CME speed of Group I is 1022km/s and that of Group II is 647km/s. It is also found that the properties of the selected M-class flares such as flare intensity, rise time, duration and decay time are greater for the DH associated flares than the non-DH flares. Group I has a slightly larger number (56%) of western events than eastern events (44%), whereas Group II has a larger number of eastern events (62%) than western events (38%). We also compare this analysis with the previous study by Lawrance, Shanmugaraju, and Vršnak (Solar Phys.290, 3365L, 2015) concerning X-class flares and confirm that high-intensity flares (X-class and M-class) have the same trend in the CME and flare properties. Additionally we consider aspects like acceleration and the possibility of CME-streamer interaction. The average deceleration of CMEs with DH type II bursts is weaker (a= − 4.39 m / s 2) than that of CMEs without a type II burst (a= − 12.21 m / s 2). We analyze the CME-streamer interactions for Group I events using the model proposed by Mancuso and Raymond (Astron. Astrophys.413, 363, 2004) and find that the interaction regions are the most probable source regions for DH type II radio bursts. © 2017, Springer Science+Business Media Dordrecht.

Vijayalakshmi P.,Pandian Saraswathi Yadav Engineering College | Sumathi M.,Sri Meenakshi Government Arts College for Women
4th International Conference on Advanced Computing, ICoAC 2012 | Year: 2012

Design of an algorithm for vehicle identification by recognizing the number plate is presented. This new vehicle identification technique consists of vehicle detection, plate localization and character recognition. Here, Genetic algorithm (GA) is employed at two levels: for detecting vehicle from traffic image and recognizing character from the number plate. Detection is based on contour and shape information. GA controls the window size to capture each vehicle in a separate widow. Connectivity and adjacency concepts are used to locate and extract number plate and its characters. A digital board (DB) with window panes is introduced to recognize each character uniquely. GA is adopted at the second level to map character pixels into the window panes as lines. For each character in the number plate, distinct feature vector is computed. Finally, a feature based matching is adopted for character recognition. Experiments have been conducted with images taken from various scenes and conditions and the detection rate is found to be 92.5 %. Experiments have conducted for recognition with LPR images taken at different conditions and the recognition rate is found to be 91 %. Detection time is linear function of number of objects in the input image. Potential applications include provisioning of vehicle parking facilities and campus security system for permitting authorized vehicles into the premises. © 2012 IEEE.

Krishna Bama G.,Sri Meenakshi Government Arts College for Women | Anitha R.,Madurai Kamaraj University | Ramachandran K.,Madurai Kamaraj University
Nondestructive Testing and Evaluation | Year: 2010

Thermal diffusivity and thermal conductivity of aqueous solution of D-mannitol for various concentrations are measured at room temperature by ultrasonics and photoacoustic techniques, which show weak concentration dependence. The present result will be useful as data for further use, as these are rarely reported in literature.

Santhi M.,Sri Meenakshi Government Arts College for Women | John Peter A.,Government Arts and Science College
Physica E: Low-Dimensional Systems and Nanostructures | Year: 2010

We study the effects of laser field intensity over the ground state binding energy of light and heavy hole excitons confined in GaAs/Ga1-xAlxAs cylindrical quantum wire. We have applied the variational method using 1s-hydrogenic wavefunctions, in the framework of the single band effective mass approximation and computed the exciton binding energy as a function of the wire radius for different field of laser intensities. The valence-band anisotropy is included in our theoretical model by using different hole masses in different spatial directions. The results show that (i) the binding energy is found to increase with decrease in the wire radius, and decrease with increase in the value of laser field amplitude, (ii) the heavy-hole exciton in a cylindrical quantum wire is more strongly bound than the light-hole exciton and (iii) the binding energy of the impurity for the narrow wire is more sensitive to the laser field amplitude. © 2010 Elsevier B.V. All rights reserved.

Sarala Thambavani D.,Sri Meenakshi Government Arts College for Women | Sabitha M.A.,Ja College For Women Autonomous
Research Journal of Pharmaceutical, Biological and Chemical Sciences | Year: 2012

Waste water samples from sugar industry were collected and analyzed for biological oxygen demand (BOD) and chemical oxygen demand (COD). In the present study, Mangifera indica leaf powder was used for the treatment of sugar mill effluent. The kinetics of COD and BOD degradation were measured and fitted to several equations (zero-, first-, second-, diffusion, parabolic diffusion, simple Elovich and exponential equations). Two initial COD and BOD concentrations were 21216 mg/l and 9333 mg/l respectively and the observations were carried out for 8 hours. Even though zero-, second-, parabolic diffusion and exponential kinetics adequately describe the data, diffusion kinetics indicated the best model for describing the degradation of organic matter with high coefficient of determination (R2 = 0.928 and 0.937 respectively for COD and BOD reduction). The data indicate that the prepared adsorbent surface sites are heterogeneous in nature and that fits into a heterogeneous site-binding model. Commonly used isotherms namely Freundlich and Temkin models were studied. The present system followed the Temkin isotherm model. The results supported that the Mangifera indica based bioadsorbent can be used to remove the excess organic waste from its contaminant sources.

Sumathi M.,Sri Meenakshi Government Arts College for Women | Vijayalakshmi P.,PSY Engineering College
Proceedings of 2015 IEEE International Conference on Electrical, Computer and Communication Technologies, ICECCT 2015 | Year: 2015

In traditional ART2 network, class representation is contained in a F2 node instead of being dispersed on several nodes. As a result, any harm to that F2 node leads to the loss of that class. The proposed network is capable of maintaining categories in a dynamic hierarchical structure. The new architecture is characterized by: (a) maintains all the characters of traditional ART2 network; (b) Creates better clustering of patterns; (c) preserve learnt patterns in a dynamic structure. The proposed networks provide a few advantages, quick learning and reduced search time. To demonstrate their capabilities, the proposed networks were applied to solve the image classification problems. The proposed network is believed to achieve effective unsupervised task and it has been experimentally found to perform well in images classification. © 2015 IEEE.

Santhi M.,Sri Meenakshi Government Arts College for Women | Yoo C.,Kyung Hee University
Superlattices and Microstructures | Year: 2012

The effect of hydrostatic pressure on the binding energy of a hydrogenic impurity in a GaAs/GaAlAs quantum wire is discussed. Calculations have been performed using Bessel functions as an orthonormal basis within a single band effective mass approximation. Pressure induced photoionization cross section of the hydrogenic impurity is investigated. The total optical absorption and the refractive index changes as a function of normalized photon energy between the ground and the first excited state in the presence of pressure are analysed. The optical absorption coefficients and the refractive index changes strongly depend on the incident optical intensity and the pressure. © 2012 Elsevier Ltd. All rights reserved.

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