Effect of thermal noise on atom-field interaction: Glauber-Lachs versus Mixing

Coherent signal containing thermal noise is a mixed state of radiation. There are two distinct classes of such states, a Gaussian state obtained by Glauber-Lachs mixing and a non-Gaussian state obtained by the canonical probabilistic mixing of thermal state and coherent state. Though both these versions are noise-included signal states, the effect of noise is less pronounced in the Glauber-Lachs version. Effects of these two distinct ways of noise addition is considered in the context of atom-field interaction; in particular, temporal evolution of population inversion and atom-field entanglement are studied. Quantum features like the collapse-revivals in the dynamics of population inversion and entanglement are diminished by the presence of thermal noise. It is shown that the features lost due to the presence of thermal noise are restored by the process of photon-addition.Comment: 15 pages, 5 figure

How could a natural catastrophe impact the ecology of a species? The Nicobar megapode and tsunami

This study on the impact of the 2004 tsunami on the Nicobar megapode Megapodius nicobariensis, endemic coastal living bird species in the Nicobar group of islands showed a significant decline (nearly 70%) in the number of individuals when compared to before tsunami populations (Paired sample test, t=2.061, df=14, p<0.05). The tsunami has also adversely influenced the nest-site selection of the megapodes. The post tsunami impact on this species is also expected to be severe, pushing the species into the category of "critically endangered"

Experimental and numerical study on axial impact loading of pultruded composite tubes

The application of fibre reinforced composites has been increasing in the area of impact and blast loading of structures. The major advantages of these materials over metals are higher specific energy absorption, more economical, low weight and less maintenance. In this work, an attempt is made to study the energy absorption characteristics of unidirectional pultruded composite tubes. Two different cross sections (circular and square) were used for the study. To absorb more energy during the impact or blast loading the composite tubes have to deform progressively. To induce the progressive deformation of composite tubes two different types of triggering mechanisms were used. The energy absorption of each tube was studied experimentally. A new approach was adopted using cohesive elements for the numerical assessment of the energy absorbing capability of composite tubes. Finally the experimental and numerical results were compared

Pultruded composite tubes for crashworthiness

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Gender Discrimination and Women's Development in India

Gender is a common term where as gender discrimination is meant only for women, because females are the only victims of gender discrimination. Females are nearly 50 percent of the total population but their representation in public life is very low. Recognizing women's right and believing their ability are essential for women's empowerment and development. This paper deals with gender discrimination in India, its various forms and causes. Importance of women in devleopment, legislation for women and solution for gender discrimination are also discussed in this paper.gender discrimination, women's development, legislation for women, education, employment, economic independece, empowerment, decision making and self confidence