Dependence of structure factor and correlation energy on the width of electron wires

The structure factor and correlation energy of a quantum wire of thickness $b\ll a_B$ are studied in random phase approximation and for the less investigated region $r_s<1$. Using the single-loop approximation, analytical expressions of the structure factor have been obtained. The exact expressions for the exchange energy are also derived for a cylindrical and harmonic wire. The correlation energy $\epsilon_c$ is found to be represented by $\epsilon_c (b,r_s)= \frac{\alpha(r_s)}{b} + \beta(r_s)\; ln(b) + \eta(r_s)$, for small $b$ and high densities. For a pragmatic width of the wire, the correlation energy is in agreement with the quantum Monte Carlo simulation data.Comment: Being slightly modifie

Biodiversity assessment of sea cage farming sites in Gulf of Mannar, Tamil Nadu, India

Marine fin and shellfish farming is an age old practice across the globe to augment the seafood production and to supplement the protein rich food. The open sea cages are particularly advantageous for maintaining the brood stock of potential species like cobia (Rachycentron canadum) and silver pompano (Trachinotus blochii) for captive breeding. A large congregation of various bioresources are also found to be associated with cage farming (Imelda et al., 2010). In the present study, an attempt was made to understand the biodiversity of the cage farming area at Mandapam in Gulf of Mannar, India

Agrarian distress and livelihood strategies : a study in Pulpalli Panchayat, Wayanad District, Kerala

This paper examines the household livelihood strategies under agrarian distress in Pulpalli Panchayat of Kerala. It also looks at the relationship between household assets and livelihood strategies. The negotiations of institutions by the marginalized and depressed sections of the society were analysed in detail. Major causes of agrarian distress in the study area are the ecological degradation and fall in crops income. Land continues to be the most important asset determining livelihood outcomes. The livelihood strategies have been investigated in relation to land, education, housing pattern, investments & credit facilities, and participation in organizational activities. The livelihood strategies adopted by farmers in the wake of agrarian crisis includes diversification of agriculture, share cropping, organic farming, self-help group activities, cattle rearing, migration and exchange of labour. Livelihood strategies varied across socio-economic groups as farmers owning better landholdings diversified cropping patterns while poor households participated in the activities of SHGs. Casual agricultural labourers and marginal farmers moved to other places in search of jobs. Mitigation of agrarian distress requires public provision of education, health and other social safety measures. Key words: Livelihood risk, Coping Strategies, Livelihood, Livelihood Assets, Institutions, Wayanad, Kerala JEL Classification: Q, Q 0

Ecology and biodiversity of open sea cage farm at Mandapam, India

Farming of marine fin and shellfish species is an age old practice across the globe to augment the seafood demand and to supplement the rich protein food. Fin fish mariculture in India has been a recent initiative and the Central Marine Fisheries Research Institute was successful in developing captive breeding and seed production technique for cobia (Rachycentron canadum) and silver pompano (Trachinotus blochii). The open sea cages are particularly advantageous for maintaining the brood stock of potential species for captive breeding. However, the ecology of the cage farming sites is of paramount importance and should be conducive for the survival, health and growth of fishes that are farmed. In the present study, an attempt was made to understand the ecology and biodiversity of the cage farming area at Mandapam in Gulf of Mannar, south-east coast of India

Slender Sunfish landed at Chinnapalam (Pamban), the south-east coast of India

The Slender Sunfish, Ranzania laevis, is a mola belonging to the family Molidae. It is the only member of the genus Ranzania, found globally in tropical and temperate seas. They are oceanic and found in depths ranging from 1 to 140m. The Slender Sunfish is the most elongated species of sunfish and the maximum reported size is 100.0 cm (Total Length). R. laevis is a distinctively shaped fish; they lack a true tail and instead have a clavus