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Palampur, India

Baczynski M.,University of Silesia | Jayaram B.,Sri Sai University | Jayaram B.,Slovak University of Technology in Bratislava
Fuzzy Sets and Systems

In this paper, we attempt a systematic study of QL-implications. Towards this end, firstly, we investigate the conditions under which a QL-operation becomes a fuzzy implication without imposing any conditions on the underlying operations. Following this, we discuss the conditions under which this family satisfies some desirable algebraic properties. Based on the obtained results and existing characterization results, the intersections between QL-implications and the two most established families of fuzzy implications, viz., (S,N)- and R-implications are determined. It is shown that QL-implications contain the set of all R-implications obtained from left-continuous t-norms that are also (S,N)-implications. Finally, the overlaps between QL-implications and the recently proposed f- and g-implications are also studied. © 2008 Elsevier B.V. All rights reserved. Source

Teo E.J.,National University of Singapore | Bettiol A.A.,National University of Singapore | Xiong B.,National University of Singapore | Breese M.B.H.,National University of Singapore | Shuvan P.T.,Sri Sai University
Optics Express

In this paper, we demonstrate a direct method of fabricating an all-silicon, single-mode Bragg cladding rib waveguide using proton beam irradiation and subsequent electrochemical etching. The Bragg waveguide consists of porous silicon layers with a low index core of 1.4 that is bounded by eight bilayers of alternating high and low refractive index of 1.4 and 2.4. Here, the ion irradiation acts to reduce the thickness of porous silicon formed, creating an optical barrier needed for lateral confinement. Singlemode guiding with losses as low as approximately 1 dB/cm were obtained for both TE and TM polarization over a broad range of wavelengths from 1525 nm to 1625 nm. Such an approach offers a method for monolithic integration of Bragg waveguides in silicon, without the need for multiple processes of depositing alternating materials. © 2010 Optical Society of America. Source

Kiran P.P.,Tata Institute of Fundamental Research | Kiran P.P.,University of Hyderabad | Bagchi S.,Tata Institute of Fundamental Research | Bagchi S.,University of Hyderabad | And 4 more authors.
Optics Express

We present measurements of the supercontinuum emission (SCE) from ultrashort Ti:Saph laser pulse filamentation in air in a tightly focused geometry. The spectral broadening of SCE indicates that peak intensities exceed the clamping value of a few 1013 W/cm2 obtained for filamentation in a loose focusing geometry by at least one order of magnitude. We provide an interpretation for this regime of filamenation without intensity clamping. © 2010 Optical Society of America. Source

Sharma D.,Singhania University | Thakur S.K.,Lovely Professional University | Thakur S.K.,Sri Sai University
Philosophical Magazine

Bulk samples of (Se100-xBix)90Te 10 (x = 0, 0.5, 1, 1.5, 2, 2.5 and 3 at%) system were prepared using the melt quenching technique. The amorphous nature of bulk samples was confirmed using X-ray diffraction. The compositional variation in physical properties, namely density ρ, molar volume Vm, compactness δ, average coordination number m, average number of constraints Ncon, number of lone pair electrons L, bond energy, average heat of atomization Hs, mean bond energy E and glass transition temperature Tg of the system have been studied. The mean bond energy has been calculated using the chemical bond approach (CBA). The glass transition temperature was calculated using the Tichy-Ticha method and was found to increase with Bi content. The mean bond energy was found to be proportional to the glass transition temperature. Average coordination number, average number of constraints, mean bond energy and density increase, whereas the average heat of atomization decreases with increasing Bi content in Se-Te alloys. The energies of the various possible bonds have also been determined. © 2011 Taylor & Francis. Source

Rana A.K.,Sri Sai University | Singha A.S.,National Institute of Technology Hamirpur
Polymer Science - Series A

Recently, natural fibers reinforced polymer composites have been finding an extensive use in dielectric and automobile applications. So keeping in view their applications part, effect of fiber’s surface functionalization on dielectric and flammability properties of resulted unsaturated polyester (UPE) matrix based bio-composites have been examined in present research paper. Raw, silanated and acrylonitrile (AN) graft copolymerized Cannabis indica [Cannabis indica-g-poly(AN)] fibers have been used in different proportions for the fabrication of composite materials. Optimization of fibers proportion has been carried out by evaluating mechanical properties like tensile, compressive and flexural strength of composite materials. The composite materials with optimized mechanical properties have been further evaluated for their flammability and dielectric properties i.e., dielectric strength, loss, dissipation factor and dielectric constant. Both flammability and dielectric properties of polymer composites were found to improve after surface functionalization of fibers. In addition, composite samples were also evaluated for their thermal, morphological and physico-chemical properties. © 2015, Pleiades Publishing, Ltd. Source

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