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Tiruchirappalli, India

Bishop Heber College is a Christian educational institution in Tiruchirappalli, Tamil Nadu, India. It was founded in 1966, although the school has historical roots extending through various earlier local religious schools to about the mid-nineteenth century. Wikipedia.

Vijayalakshmi K.,Bishop Heber College | Pillay V.V.,Sujatha Degree and PG College for Women
Microelectronic Engineering

Thin films of aluminum nitride (AlN) were prepared on Si (1 0 0) substrate by dc reactive magnetron sputtering. The influence of sputter deposition time on the properties of the AlN films was studied. The films were characterized by X-ray diffraction (XRD), Fourier transform infrared spectrometer (FTIR) and Scanning Electron Microscope. Dielectric properties of the film were investigated using impedance analyzer. XRD measurements showed the presence of hexagonal wurtzite structure. The crystal orientation of the AlN films changed from (1 0 0) to (0 0 2) with increase in deposition time. The peak found in FTIR spectra was attributed to A1 (To) phonon modes. The morphology of the film improved with the increase in deposition time. MIS capacitors were fabricated on n type silicon substrates, and the dependence of dielectric parameters with deposition time was investigated. Dielectric constants of 6.0-6.8 were obtained at 1 MHz. Response of AlN/Si films of different thicknesses, with Al and Pd catalytic over layers, was investigated for 50 ppm hydrogen. Pd/AlN/Si device fabricated with 114 nm layer of AlN revealed an enhanced response in the C-V characteristics, while Al/AlN/Si device did not show any effect, indicating that the hydrogen sensitivity is highly dependent on the gate outer surface and deposition time. © 2013 Elsevier B.V. All rights reserved. Source

Sakkaravarthi K.,Bishop Heber College | Kanna T.,Bishop Heber College
European Physical Journal: Special Topics

In this paper, we construct the bright-soliton bound states of an integrable (2 + 1)-dimensional multicomponent long wave-short wave resonance interaction (LSRI) system by using the exact bright-soliton solutions obtained in Ref. [24] and analyze their interesting collision dynamics. We show that the beating and breathing oscillations of the bound solitons can be controlled by tuning the polarization parameters. Also, we explore the interaction between the bound-soliton and a standard soliton. We also point out that the two bound-soliton state seems to be robust against collision with a standard soliton and remain to be bounded even after collision. © 2013 EDP Sciences and Springer. Source

John Robinson P.,Bishop Heber College | Henry Amirtharaj E.C.,Bishop Heber College
International Journal of Fuzzy System Applications

Intuitionistic fuzzy sets and vague sets are generalizations of the concept of fuzzy sets. Various researchers have studied the vagueness of data through vague sets, and it was later demonstrated that vague sets are indeed intuitionistic fuzzy sets. Since its entry in the literature, vague set theory has received increased attention. Many real life problems involve information in the form of vague values, due to the increasing complexity of the socio-economic environment and the vagueness of the inherent subjective nature of human thinking. Instead of using point-based membership as in fuzzy sets, interval-based membership is used in a vague set. This paper presents a detailed comparison between vague sets and intuitionistic fuzzy sets, from various perspectives of algebraic properties, graphical representations, and practical applications. Methods of calculating the correlation coefficient of intuitionistic fuzzy sets and interval-valued intuitionistic fuzzy sets are already found in the literature. This paper defines the correlation coefficient of vague sets through simple examples. © 2011, IGI Global. Source

Sivasankar V.,Thiagarajar College of Engineering | Ramachandramoorthy T.,Bishop Heber College | Chandramohan A.,Bishop Heber College
Journal of Hazardous Materials

The present work is concerned with the defluoridation capacities of activated (ATFS) and MnO2-coated Tamarind Fruit Shell (MTFS), using batch and column sorption techniques. In the batch technique, the dynamics of fluoride sorption, with respect to pH, [F]o and sorbent dose, was studied. The applicability of pseudo-first order for ATFS and Ritchie-second order for MTFS was observed. The kinetics data were found to fit well with Temkin isotherm for ATFS and Langmuir for MTFS. The interaction of co-ions in the defluoridation capacity of the sorbent was studied. Column experiments were carried out under a constant fluoride concentration of 2mg/l, flow rate and different bed depths. The capacities of the breakthrough and exhaustion points increased with increase in the bed depth for ATFS unlike MTFS. The Thomson model was applied to the column experimental results. The characterization of the sorbents, ATFS and MTFS, was done using the FTIR, SEM and XRD techniques. © 2009 Elsevier B.V. Source

Sakkaravarthi K.,Bishop Heber College | Kanna T.,Bishop Heber College
Journal of Mathematical Physics

The exact bright one- and two-soliton solutions of a particular type of coherently coupled nonlinear Schrödinger equations, with alternate signs of nonlinearities among the two components, are obtained using the non-standard Hirota's bilinearization method. We find that in contrary to the coherently coupled nonlinear Schrödinger equations with same signs of nonlinearities the present system supports only coherently coupled solitons arising due to an interplay between dispersion and the nonlinear effects, namely, self-phase modulation, cross-phase modulation, and four-wave mixing process, thereby depend on the phases of the two co-propagating fields. The other type of soliton, namely, incoherently coupled solitons which are insensitive to the phases of the co-propagating fields and arise in a similar kind of coherently coupled nonlinear Schrödinger equations but with same signs of nonlinearities are not at all possible in the present system. The present system can support regular solution for the choice of soliton parameters for which mixed coupled nonlinear Schrödinger equations admit only singular solution. Our analysis on the collision dynamics of the bright solitons reveals the important fact that in contrary to the other types of coupled nonlinear Schrödinger systems the bright solitons of the present system can undergo only elastic collision in spite of their multicomponent nature. We also show that regular two-soliton bound states can exist even for the choice for which the same system admits singular one-soliton solution. Another important effect identified regarding the bound solitons is that the breathing effects of these bound solitons can be controlled by tuning the additional soliton parameters resulting due to the multicomponent nature of the system which do not have any significant effects on bright one soliton propagation and also in soliton collision dynamics. © 2013 American Institute of Physics. Source

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