Spin, charge and orbital ordering in La0.5Sr1.5MnO4

We have analyzed the experimental evidence of charge and orbital ordering in La0.5Sr1.5MnO4 using first principles band structure calculations. Our results suggest the presence of two types of Mn sites in the system. One of the Mn sites behaves like an Mn(3+) ion, favoring a Jahn-Teller distortion of the surrounding oxygen atoms, while the distortion around the other is not a simple breathing mode kind. Band structure effects are found to dominate the experimental spectrum for orbital and charge ordering, providing an alternate explanation for the experimentally observed results.Comment: 4 pages + 3 figures; To appear in Phys. Rev. Let

Biographical and Cultural Elements in S.R.G. Sundaram’s Short Stories

Culture is the one that interacts with the lives of living people from ancient times to the present day and from time to time. S.R.G. Sundaram, who is awarded with ‘Bharathi Paniselvar’, is a multifaceted literary creator. Our Tamil world is well aware of his contribution to the development of Tamil. Like Valliyappa, he is also a prolific writer, who has made significant contributions in the form of short stories, plays, novels, songs, essays, and short stories for children. S.R.G. Sundaram has been doing his work since the age of seventeen (since 1957) and still does it today with deep knowledge and creative thinking. In his short stories, many cultural elements are found, such as love, rationality, hospitality, friendship, loneliness, love for life, diligence, punctuality, and patriotism. The purpose of this study is to explore and sort them out

Chikungunya Epidemic Mortality in India: Lessons from 17th Century Bills of Mortality Still Relevant

Chikungunya is a virus spread by the bite of the Aedes mosquito, which recently reemerged as a massive epidemic in the Indian Ocean islands and India. Chikungunya is generally considered self-limiting and has been reported as non-fatal but, since March 2005, one-third of the 770,000 people in the Indian Ocean Island of R�union (a French territory) have been affected by Chikungunya with 237 deaths. India reported 1.3 million cases of Chikungunya however the Government of India has not reported any deaths. However there is evidence that deaths due to Chikungunya did occur. The lack of official reports of deaths is mainly due to the poor recording of ‘Causes of Death’ in India. The London Bills of Mortality from the 17th provides a very good example of the importance of proper reporting of deaths especially during an epidemic period. This paper reflects on the London bills of mortality and modern day lessons to be drawn from it as well as the reasons behind the apparent lack of death reporting in 2006’s Chikungunya epidemic.

Electronic Structure of Sr_2FeMoO_6

We have analysed the unusual electronic structure of Sr_2FeMoO_6 combining ab-initio and model Hamiltonian approaches. Our results indicate that there are strong enhancements of the intraatomic exchange strength at the Mo site as well as the antiferromagnetic coupling strength between Fe and Mo sites. We discuss the possibility of a negative effective Coulomb correlation strength (U_{eff}) at the Mo site due to these renormalised interaction strengths.Comment: To appear in Phys. Rev. Let

Teaching English in India —The Use of Technologically Enhanced Realia in the Classroom

In India acquisition of English language is imperative if one wants to sell oneself in the increasingly competitive job market. With a booming population the nation is filled with educated, technologically literate youth. English is not merely a foreign language in India. As India is separated by a plethora of languages knowledge of English is imperative. As the teachers in India are not native speakers of English the language they teach is not free from errors. The articulation is quite problematic as the mother tongue influence is quite pronounced. Technology helps to reduce these errors. Movies as a tool can enhance the listening and speaking skills of our students. It is quite boring to work with disembodied voices and the recorded conversations available in language labs do not sustain the learner’s interest. However learners are often forced to listen to recorded conversations of people they never see, the conversation is often stilted and contemporary idiom is hardly used. However, a completely new dimension to aural practice can be added in the classroom by using movies