27 research outputs found
рддрд╛рд░рд▓реА рдФрд░ рдорд▓рдмрд╛рд░ рд╕реЛрд▓ рдХреЗ рд╕реНрдЯрд╛рдБрдХ рдкрд░ рдмрд╛рд░рд┐рд╢ рдХрд╛ рдкреНрд░рднрд╛рд╡
рдХреГрдкрдпрд╛ рдкреВрд░рд╛ рд▓реЗрдЦрд╛ рдкрдв
Simulation of Droplet Formation, Ejection, Spread, and Preliminary Designof Nozzle for Direct Ceramic Inkjet Printing
Recent advances in drop-on-demand (DOD)-type inkjet printing techniques have increasedresearch activities in the area of direct ceramic inkjet printing. In an attempt to develop a ceramicinkjet printer for the manufacture of ceramic components with their sizes in micro scale, theformation of ceramic ink droplet (ethyl alcohol loaded with different volume fractions of aluminaparticles) and its spread from a reservoir using piezoelectric actuation are simulated. The propertiesof the ceramic ink are taken from the data reported in literature. The simulations were performedwith computational fluid dynamics software (CFD-ACE+), CFDRC. This study gives details ofthe interaction among different physical phenomena that contribute to the droplet formation andejection process. The results from this study are being used for a preliminary design of nozzleand for the preparation of ceramic inks to achieve the desired droplet characteristics
Systematics, fishery and biology of the white sardine Escualosa thoracata (Valenciennes, 1847) exploited off Kerala, south-west coast of India
Landings of the white sardine Escualosa thoracata (Valenciennes, 1847) indicated a shift in their abundance from north-east to south-west coast of India and a sharp decline in the resource landings during the last decade along the entire range of its distribution. High local demand coupled with competitive price for the species might have led to overexploitation of this otherwise seasonal resources along the major areas of its abundance along the Indian coast. Detailed study on the systematics, fishery and biology of the species landed along Kerala coast was undertaken during 2015 and 2016. Stock assessment studies indicated near optimum fishing pressure on the resource along the Kerala coast
Fishery, population dynamics and stock structure of frigate tuna Auxis thazard (Lacepede, 1800) exploited from Indian waters
Auxis thazard, commonly known as frigate tuna
represents an important group of coastal tuna species
occurring in the Indian waters. The species is landed all
along the Indian coastline and the major landing is along
the south-west coast with Kerala contributing the most. The
species is exploited by a variety of gears viz., drift gill nets,
shore seines, ring seines and hooks and lines. Though there
is recent information on the fishery and the exploitation
status of Auxis thazard from Tuticorin (Kasim, 2002;
Abdussamad et al., 2005) and Veraval (Ghosh et al., 2010),
studies on the catch, population characteristics and stock
estimates covering the entire coasts of India are lacking
after the work of Silas et al. (1985) and James et al. (1993).
These studies date back to two decades, after which there
has been a change in the fishing pattern of coastal tunas
throughout the country. Therefore, the present study was
undertaken to provide an insight into the fishery, population
dynamics and stock structure of A. thazard exploited from
Indian water
Fishery, biology and stock structure of skipjack tuna, Katsuwonus pelamis (Linnaeus, 1758) exploited from Indian waters
Global catches of skipjack tuna have been steadily
increasing since 1951, reaching a peak in 2009 at 25, 99,681 t
(Fig.1). Most of the catches were reported from the fishing
areas 71, 51, 61 and 34 (FA0, 2011). Globally skipjack
tuna is caught at the surface, mostly with purse seines and
pole and lines and to a small extent by gillnets, troll lines
and longlines. Gears like purse-seine and very long gillnets
enabled few nations to augment their production, whereas
traditional pole and line nations suffered heavily
Fishery and bionomics of the little tuna, Euthynnus affinis (Cantor, 1849) exploited from Indian waters
Euthynnus affinis, with an average annual landing of 40,757 t during 2006-2010 formed the bulk (65.1%) of the total coastal
tuna catch of the country. The fishery, biology, growth and stock structure of E. affinis was studied in detail. Hooks and
lines, gillnets and purseseines were the major gears exploiting the fish. Fishery was sustained mainly by 1 - 2 year old fishes
(34 to 50 cm). Size at first maturity was estimated at 37.7 cm and fecundity was 3,08,150 eggs. Spawning was observed
round the year with peaks during July-August and November-January. E. affinis was found to be a nonselective generalist
feeder foraging on fishes, crustaceans and molluscs. The lengthтАУweight is given by the relationship 0.0254 L2.889 with no
significant difference between males and females. Age and growth were estimated using length based methods. The
von Bertalanffy growth parameters estimated were LтИЮ = 81.92 cm, annual K= 0.56 and t0 = -0.0317. Mortality estimates were
M= 0.93 and Z = 1.68 and F= 0.75 with the exploitation rate E=0.45. The maximum sustainable yield estimated was higher
than the average annual catch indicating scope for further exploitation
Plastic debris entangled silky shark landed
Several species of marine fishes have been
documented as entangled in manmade debris in
oceans, but comparatively few reports are available
globally on sharks. Here we report the observation
of a silky shark Carcharhinus falciformis affected
by plastic debris caught in the Arabian Sea
Enigmatic Indian Oil Sardine: An Insight
Marine capture fisheries is an important component of the fisheries sector in India, generating livelihood avenues for an estimated 3.79 million fishers directly besides those involved in the secondary and tertiary structures concerned with fish marketing, processing and exports of fish and fishery products. Sustainable harvesting of the marine fishery resources is important in a scenario where there is large scale over-capitalisation in the sector and abrupt and long-term disruptions in environmental parameters due to climate change related processes. The Indian Oil Sardine, a major single species fishery in India accounts for 17 - 20% of the total marine fish landings. At the national level, in landing volumes it is the top ranked species during most years. Among marine fishes, its importance as a favoured table fish and rich source of fish oils creates a unique position for the Indian oil sardine in terms of its economic value. However, the resource is prone to sudden fluctuations in abundance that makes it an enigma to researchers, fishers and managers. ICAR-Central Marine Fisheries Research Institute has conducted extensive research on the resource since its inception and several aspects of its biology, fishery and stock assessment have been reported periodically. Considering the importance of this resource to the marine fisheries sector of India, it is important to compile all existing information and subsequent research insights to assist its efficient management along the Indian coast. I am happy that the scientists of the Pelagic Fisheries Division of CMFRI have completed the task of compiling all recent information and analysed large amount of data collected pertaining to the Indian Oil Sardine in this document for the benefit of all stakeholders interested in knowing about this valuable fishery resource
Not Available
Not AvailableLandings of the white sardine Escualosa thoracata (Valenciennes, 1847) indicated a shift in their abundance from north-east to south-west coast of India and a sharp decline in the resource landings during the last decade along the entire range of its distribution. High local demand coupled with competitive price for the species might have led to overexploitation of this otherwise seasonal resources along the major areas of its abundance along the Indian coast. Detailed study on the systematics, fishery and biology of the species landed along Kerala coast was undertaken during 2015 and 2016. Stock assessment studies indicated near optimum fishing pressure on the resource along the Kerala coast.Not Availabl
Not Available
Not AvailableLandings of the white sardine Escualosa thoracata (Valenciennes, 1847) indicated a shift in their abundance from north-east to south-west coast of India and a sharp decline in the resource landings during the last decade along the entire range of its distribution. High local demand coupled with competitive price for the species might have led to overexploitation of this otherwise seasonal resources along the major areas of its abundance along the Indian coast. Detailed study on the systematics, fishery and biology of the species landed along Kerala coast was undertaken during 2015 and 2016. Stock assessment studies indicated near optimum fishing pressure on the resource along the Kerala coast.Not Availabl