St. Xavier`s College, Mapusa, Bardez Goa

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Recent Submissions

Multilingualism, education policy and inequality of educational opportunities: The Goan case
(2006-09-01) Afonso Botelho
Many parents in post-liberation Goa exhibit a pronounced preference for English medium early schooling for their children. The enrolment in the English medium schools, however, is much lower than in the Marathi and Konkani medium schools. This educational situation seems to be the outcome of such factors as mobility aspirations, identity politics, education policy, financial constraints and inacces sibility of English medium schools. This paper examines the language patterns at home and school in Goa and argues that the denial of grants-in-aid to the English medium early schools deprives the poor of the equality of educational opportunities.
Raman and EXAFS study of Neodymium and Praseodymium included alumino germinate glass
(Material Research Express, 2019-07-10) B P Soares; J A E Desa; C Nayak; D Bhattacharyya; S N Jha
Germanate glass has been synthesised keeping Al2O3 fixed at 10 mol% with Neodymium oxide and Praseodymium oxide varying from 5 mol% to 10 mol%. The effect of the rare-earth inclusion on the structure of the host matrix was examined by several techniques. Extended x-ray Absorption Fine Structure showed tetrahedral coordination of oxygen around Ge for all the glasses and gave the oxygen coordinations around Nd and Pr to be 8.7 and 8.9 respectively which is in contrast to the often quoted octahedral coordination for these ions. Raman spectroscopic studies have shown the Qn linkages of the GeO4 tetrahedra in these glasses as predominantly Q2 and Q3. The distribution of relative fractions of these linkages shows the Pr containing glass as having a few Q° and maximum Q2 connectivities while for the Nd and Nd-Pr containing glasses, these distributions peak for the Q3 connected linkages. These observations lead to the view that the Pr containing glass has a less well connected network than the Nd containing glasses. The presence of Pr in these glasses results in a decrease in electronic band gap energy and an increase in the electronic polarizability.
Influence of Praseodymium on alumino germinate glasses containing Nd and Lainclusions
(AIP conference proceedings 2115, 2019-07-11) Benedict P. Soares; CJ. A. Erwin Desa; P. S. R. Krishna
Oxides of La, Nd and Pr have been included both singly and as pairs in Alumino-Germanate glasses at molar percentages varying from 5% to 10%. The glass transition temperatures were found by differential thermal analysis in this series of five glasses. Band gap energies were obtained from the absorption coefficient using UV-Visible spectra. The glass transition temperatures and densities of the glasses were found to increase while the band gap energies were found to decrease on addition of rare earth from La to Nd to Pr. The presence of Pr4+ ions in the network formation could be used to explain the variation of density, glass transition temperature and band gap energy in these samples.
Dynamics in polyvinylalcohol-borox based hydrogel doped with carboxyl iron: “Quasielastic neutron scattering study
(AIP conference proceedings 2115, 2019-07-11) P. S. Dubey; Mathias B. Lawrence; H. Srinivasan; V. K. Sharma; S. Mitra
Here we have investigated the dynamics of polyvinyl alcohol-borax doped with carbonyl iron (CI) as studied using quasielastic neutron scattering (QENS) technique. Here borax and CI is used as a crosslinker and dopant respectively and D2O used as solvent. The measurements were carried out in the momentum transfer (Q) range of 0.67-1.8 Å−1 using MARX spectrometer at DHRUVA, Mumbai. The considered model suitably described the obtained experimental parameters. This model assumes that the hydrogen atoms of polymer chains diffuse in sphere of spherical volume of fixed radius, a, with diffusion coefficient, D. The obtained values of radius of spherical volume, a=2.04 Å and diffusion coefficient, Ddoped=0.53×10−5 cm2/sec, are found to be less compared to our earlier study on undoped samples. This study suggests that the incorporation of CI restricts the dynamics of PVA polymer chains.
Morphology and phylogeny of root-endophytic fungus Periconia igniaria
(Studies in Fungi, 2019-12-27) D’Souza MA; Rana S; Singh SK
Periconia igniaria, isolated as an endophytic fungus from roots of Cheilocostus speciosus from Calangute, Bardez, Goa, India was described in this manuscript. The identity of the endophytic isolate was based on asexual-morphs, cultural characteristics and phylogenetic analyses of internal transcribed spacer rDNA sequence data. To our knowledge, this is the first report of this taxon as root endophyte of Cheilocostus speciosus from Western Ghats forests, Goa, India.