Validating Continuum Lowering Models via Multi-Wavelength Measurements of Integrated X-ray Emission

X-ray emission spectroscopy is a well-established technique used to study continuum lowering in dense plasmas. It relies on accurate atomic physics models to robustly reproduce high-resolution emission spectra, and depends on our ability to identify spectroscopic signatures such as emission lines or ionization edges of individual charge states within the plasma. Here we describe a method that forgoes these requirements, enabling the validation of different continuum lowering models based solely on the total intensity of plasma emission in systems driven by narrow-bandwidth x-ray pulses across a range of wavelengths. The method is tested on published Al spectroscopy data and applied to the new case of solid-density partially-ionized Fe plasmas, where extracting ionization edges directly is precluded by the significant overlap of emission from a wide range of charge states

Tuna Fishery and Stock Assessment of Component Species off Chennai Coast

All India tuna production continued to increase with fluctuations from 848 t in 1951 to 64,006 t in 2006, with a peak production of 64,006 t in 2006. During 1985-2006 it varied from 27,148 t in 1985 to 64,006 t in 2006 with annual average landings of 39,937 t. Annual average tuna production by different maritime states was 17,041 t (42.7%) by Kerala, 5,615 t (14.1%) by Gujarat, 5,000 t (12.5%) by Tamilnadu, 2,741 t (6.9%) by Lakshadweep, 2,812 (7.0%) Karnataka, 2,716 t (6.8%) by Maharashtra, 2,009 t (5.9%) by Andhrapradesh, 1,095 t (2.7%) by Goa, 444 t (1.1%) by Andaman & Nicobar Islands, 262 t (0.7%) by Pondicherry, 134 t (0.3%) by Orissa, 68 t (0.2%) by West Bengal. Tamilnadu catch varied from 1,336 t in 1985 to 10,912 t in 2006 with an average of 5,000 t forming 1.4% of total marine fish production during 1985-2006. Species composition of all India tuna catch was Euthynnus affinis (51.2%), Katsuwonus pelamis (4.1%), Thunnus tonggol (10.4%), Auxis spp. (20.7%) and other tunnies (13.6%) and the species composition of Tamilnadu was E. affinis (59.7%), K. pelamis (11.5), Auxis spp. (12.5%), T. tonggol (5.5%) and other tunas (10.8%)

चेन्नई तट में तटीय मेखाला के निम्नीकरण पर प्रबन्धन

कृपया पूरा लेखा पढ

Exploited seerfish fishery resources of India - A review

Seerfishes forming 1.7 % of the total marine Jish catch of the country are considered as one of the high value resources Andhra Pradesh (14.3%) and Tami Nadu (11.5%) on the east coast and Gujarat (22.8%). Maharashtra (16.9%) and Kerala (16.1%) on the west coast are the principal contributors of seerfish. They are caught mainly in gillnet (65.12%) and hook & line (6.96%) from 25-50 m depth zone and. in trawl (11.47%) operated from beyond 50 m depth. Of the five species available in Indian waters, the fishery is sustained by the king seer Scomberomorus commerson and the spotted seer S.guttatus. The stock assessment studies on the king seer revealed that the present yield in different regions of the country are closer to MSY. However there is scope for stepping up production by extending fishing operations to the deeper waters beyond 50 m depth. The paper reviews their fishery, biology and stock characteristics in Indian waters

Distribution, biology and behaviour of the giant trevally, Caranx ignobilis - a candidate species for mariculture

Fishery and biology of the giant trevally, Caranx ignobilis exploited along the Tuticorin coast of Tamilnadu were monitored during 2001-2006. Fishery occurred round the year with peak landings during April.August. Spawning and recruitment occur almost round the year with peak during November-Decembcr. Young ones are abundant in shallow coastal waters and as grows, they move to deeper waters

Distribution and fishery of Lates calcarifer in India

Seabass is widely distributed along the coasts of the Indo Pacific regio

Length - weight relationship of Lutjanus rivulatus off Tuticorin, Gulf of Mannar

Length - weight relationship of Lutjanus rivulatus exhibits isometric growth since its regression coefficient did not significantly differ from 3. The relative condition factor K^^ indicates that the older specimens measuring above 420 mm were more healthy and robust than the younger individuals

Marine fish calendar. 6. Tuticorin

Tuticorin is one of the well known, age old, fishery ports of India especially by virtue of the production of valuable, good quality, natural pearls and chanks in addition to marine fish production. Early in the 19I1-'15 periods the marine fish production here was to the tune of 663,592 pounds (296.3 tonnes). The fishermen strength was 520 who operated conventional 'valavalai', 'kolavalai', 'madivalai', offshore lining, inshore lining, trolling and other minor nets with the traditional fishing crafts like Tuticorin type of plank built boats called 'Vallam' and 'catamarans'. Over the two decades, mechanized fishing has changed not only the fishing pattern but also the constituent catches. The progress of fishing industry can still be augmented by motorising the plank built boats and 'catamarans'. Present assessment of fishery resources reveals that in a year 19,850 t of fish are landed by trawlers and 9,275 t by traditional fishing units

Present status of perch fishery resources in India and its prospects

The perch resources and fisheries In India have been dealt with. As seen from the statewise perch production during 1969-19Q1, on an average 27,184 tonnes of parches were landed in India with fluctuation from 12,865 In 1969 to 49,312 in 1978. The gearwise and statewise perch production from 1982-83 to 1984-85 indicates that the mechanised units contributed 72.4 % and nonmechanised 27.6 %. Among mechanised units, the trawlers have landed the major portion of the catch (68 4 % ) . The State wise species composition of perch landings indicate that the threadtin breams formed more than 50% of the catch- During 1982-83 and 1S83-84. the perch production of Tamil Nadu was higher than all other states whereas during 1984 85, Kerala was the first in perch production followed by Andhrapradesh and Tamil Nadu- The different groups of perches landed by trawl and gill net units at different important landing centres on the east and west coast of Indian show that in all the centres the catch rates of trawlers were higher. The higher catch rate in trawl net operations In Sasoons Dock and New ferry Wharf was due to voyage fishing for more than a da