Report on dugong strandings along Gulf of Mannar

A male seacow, Dugong dugon of 240 cm in total length and weighing 350 kg. was stranded dead on 20-03-2006 at Kundhukal seashore, along Gulf of Manna

मान्नार की खाडी और पाक खाडी में तिमियों का धंसन

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जलवायु परिवर्तन तथा भूमंडलीय तापन का वर्तमान स्वरूप एवं इसका मात्स्यिकी पर प्रभाव

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समुद्र कृषि हेतु भौगोलिक सूचना प्रणाली का अनुप्रयोग

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समुद्र तटीय जलकृषि के द्वारा आजीविका उपार्जन की नवीन संभावनाएं

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Report on stranding of dolphins

A bottlenose dolphin of Tursiops spp. with a total length of 2.43 m and weighing 110 kg.was found washed ashore at Aricchalmunai, Dhanushkodi, on 17-12-2005. The carcass was in a decayed condition

Strandings of whales along Gulf of Mannar and Palk Bay

Whale strandings occurred frequently along the southeast coasts of India along Gulf of Mannar and Palk bay during Dec 2005 and August 2006

On rigidity and groups of homeomorphisms

If X is an object of a category, we denote by A(X) the group of all automorphisms of X. Thus for example, if X is a topological space, A(X) is the group of all homeomorphisms on X. In this paper, we investigate A(X) for objects in the categories of topological spaces and apply the results to obtain corresponding theorems in the categories of lattices, Boolean algebras, semigroups, graphs, and some other related categories. The groups of homeomorphisms have been investigated by J. de Groot [7] (see also [1], [5], [8] and [9]), the groups of automorphisms of lattices by G. Birkhoff [4] (see also [15]) and the groups of automorphisms of Boolean algebras by M. KatStov [13] and J. de Groot [7] (see also [12], [17]). Here we solve some open problems on this topic, generalize many known results and give different proofs for several results. The following are some of the main theorems of this paper

Haidinger's rings in curved plates

The paper describes and illustrates the haidinger interference patterns observed in curved plates of uniform thickness but of arbitrary form, and discusses their theory. Using an illuminated screen as light source and a limited viewing aperture, it is possible to observe such patterns with curved plates, their configuration depending upon the form of the plate as well as the position of the aperture with reference to the centers of curvature of the surface of the plate. It is pointed out that the interference pattern for a curved plate is geometrically similar in form to the image of the standard haidinger pattern of circular rings as seen viewed by reflection at the appropriate distance from the curved surface of the shell