Hot Core, Outflows and Magnetic Fields in W43-MM1 (G30.79 FIR 10)

We present submillimeter spectral line and dust continuum polarization observations of a remarkable hot core and multiple outflows in the high-mass star-forming region W43-MM1 (G30.79 FIR 10), obtained using the Submillimeter Array (SMA). A temperature of $\sim$ 400 K is estimated for the hot-core using CH$_3$CN (J=19-18) lines, with detections of 11 K-ladder components. The high temperature and the mass estimates for the outflows indicate high-mass star-formation. The continuum polarization pattern shows an ordered distribution, and its orientation over the main outflow appears aligned to the outflow. The derived magnetic field indicates slightly super-critical conditions. While the magnetic and outflow energies are comparable, the B-field orientation appears to have changed from parsec scales to $\sim$ 0.1 pc scales during the core/star-formation process.Comment: accepted, ApJ Letter

Fishery, population dynamics and stock assessment of the spotted seer in gill net fishery at Veraval

The fishery and population characteristics of Scomberomorus guttatus (Bloch & Schneider) from Veraval was studied for the period 2003 – 2006. The average annual catch was 378 t, forming 14.4% of the total gill net catches at Veraval. The postmonsoon and winter seasons (September to January) were the most productive seasons in terms of catch and catch rate. The length–weight relationship showed that growth was isometric for the species. The von Bertalanffy growth equation was: Lt = 61.27 [1 – e - 1.4 (t + 0.0046)] and length attained at the end of 1 and 2 years were 46.3 cm and 57.6 cm respectively. The growth performance index was 3.721 and longevity was 2.138 years. Recruitment pattern was unimodal with peak recruitment from February - July and the length at first capture was 21.1 cm. The natural mortality, fishing mortality and total mortality were 1.79, 2.92 and 4.71, respectively and exploitation ratio was 0.62. The maximum sustainable yield was 305 t, which was lower than the average annual catch indicating over-exploitation of the species. The yield per recruit and biomass per recruit was 198.9 g and 66.9 g respectively. An increase in relative yield to 101.8% would be obtained by decreasing the present level of fishing by 20%

Fishery and population dynamics of Harpadon nehereus (Ham.) off the Saurashtra coast

The fishery and population dynamics of Bombay duck (Harpadon nehereus Ham.) from Nawabunder, Rajpara and Jaffrabad were studied for the period from 2003 to 2006. The average annual landings of Harpadon nehereus was 25,079 t, which contributed 31.12 % to the total dol net catches. The seasonal peak in catch was recorded during September – January and in May. The length–weight relationship showed that growth was isometric and there was no significant variation between the sexes. The overall sex ratio was 1:0.99 with gravid and ripe females encountered in most months with a peak during September – December. The length at first maturity of female was 20.2 cm. The growth parameters were estimated as L = 35.39 cm and K = 0.86 and the length attained at the end of 1, 2 and 3 years were 20.66 cm, 29.16 cm and 32.75 cm respectively. The length at first capture was 3.42 cm with recruitment occurring in most months of the year with a peak during February – June. The natural mortality, fishing mortality and total mortality were 1.52, 1.73 and 3.25 respectively and the exploitation ratio was 0.53. The maximum sustainable yield was 23,557 t, which was lower than the average annual catch indicating overexploitation of the species. The yield per recruit and biomass per recruit was 6.565 g and 3.79 g and increase in relative yield by 111.45 % would be obtained by decreasing the present level of fishing by 40 %

Observations on the paddy-field prawn filtration of Kerala, India

Experiments were conducted to determine whether culture methods could be advantageously introduced into the existing prawn filtration practices in the paddy fields of Kerala, on the southwest coast of India. The pattern of the fishery is changing, with the demand for small prawns decreasing and that for large prams increasing

Observations on the paddy-field prawn filtration of Kerala, India

Experiments were conducted to determine whether culture methods could be advantageously introduced into the existing prawn filtration practices in the paddy fields of Kerala, on the southwest coast of India. The pattern of the fisher.y is changing, with the demand for small prawns decreasing and that for large prawns increasing. The experiments indicated that culturing of juvenile prawns for about a month resulted in relatively better catches of large sized prawns than could be obtained by cultivation for longer periods. The yield of prawns appeared to be better during the spring tide period associated with the full moon than that associated with the new moon; this is correlated with the increased tidal gradient at full moon. The fishery mainly concerns four species of penaeid prawn

Proceedings of the Second workshop on scientific results of FORV Sagar Sampada

Since inception in 1984, the Fisheries and Oceanographic Research Vessel Sagar Sampada, with sophisticated modern facilities onboard, has undertaken more than 140 cruises all over the Indian Ocean primarily in our Exclusive Economic Zone for fishery and oceanographic survey. Scientists from many institutions have made use of this facility to explore the resource potential in our sea and to understand its correlation with the environmental parameters. These survey and exploration efforts are continuing. This volume contains many papers which are the outcome of research work carried out onboard 'Sagar Sampada' during last five years (1989-1993) and presented in a Workshop to evaluate the scientific work. About 60 papers, included in this volume, bring out the results pertaining to environmental assessment, hydrology, productivity estimates, fishery resources availability, fishing technology, pollution monitoring etc. These relate mainly to the Arabian Sea, Bay of Bengal and Lakshadweep, Andaman and Nicobar Islands groups in the EEZ of India. These efforts along with other mission-oriented cruises have yielded valuable information on the fishery resources and their distribution in space and time

Exploited seerfish fisheries of india during 1998-02

Seerfishes are esteemed table fishes. In India, they are considered as one of the high value resources due to their superior quality meat, high economic return and export market. Seerfish fishery is important to artisanal fishermen who use driftnet/gillner/hooks and line employing country crafts with or without out-board engines and medium size boats with inboard engines, in the coastal waters of 25- 60 m depth. They are the target species for to 16.9% during 1998-02 indicating attainment of optimum production. The annual production during 1998-02 varied from 42,578 t in 2001 to 54,871 t in 1998 with an average of 48,847t forming 1.9% of the marine fish landing of the country. The east coast which ranked first in seerfish production during 1950s and 1960s with around 60% contribution had progressively been reduced to 40% in 1990s and during 1998-02

Atomic Layer Deposition of Nanolaminate Structures of Alternating PbTe and PbSe Thermoelectric Films

For this study PbTe and PbSe thin film nanolaminates have been prepared on silicon substrates with native oxide by Atomic Layer Deposition (ALD) using lead(II)bis(2,2,6,6-tetramethyl-3,5-heptanedionato) (Pb(C11H19O2)(2), (trimethylsilyl) telluride ((Me3Si)2Te) and bis-(triethyl silyl) selane ((Et3Si)2Se) as ALD precursors for lead, tellurium and selenium. The experimental evidence revealed the ALD growth of lead telluride and lead selenide followed the Vollmer-Weber island growth mode. We found a strong dependence of the nucleation process on the temperature. In this paper, we present the optimized conditions for growing PbTe and PbSe thin film nanolaminates within the ALD process window range of 170 degrees C to 210 degrees C and discuss an early nano-scale PbTe/PbSe bilayer structure. Results of various physical characterizations techniques and analysis are reported