John,Mohan; Dr.Shahul,Hameed M(Cochin University of Science and Technology., April , 2007)
[+]
[-]
Abstract:
In the present study two aspects of cephalopod fishery such as (i)
landings and (ii) utilization including export of cephalopods from Indian are
dealt with. Under the topic landings, craft, both traditional and mechanized
and fishing techniques employed for capturing cephalopods are discussed.
General trend in cephalopod landing in India and particularly south west coast,
species composition, description and geographic distribution of important
species of cuttle fishes, squids and octopus and the distribution and abundance
of cephalopods along the continental shelf of the south west coast are also
discussed. Some biological aspects like population parameters, maturation and
spawning, food and feeding of the two representive species of cuttle fishes and
squid viz, Sepia pharaonis and Loligo duvauceli are studied.Under utilization, general handling and processing of various frozen
cephalopods products for exports and commercial operation in a typical plant
are studied. The export of cephalopod products since its commencement is
studied in detail and market strategy for enhancing the export are suggested.
Description:
School of Industrial Fisheries,
Cochin University of Science and Technology
Jisha, C P; Dr.Kuriakose, V C(Cochin University of Science & Technology, March , 2008)
[+]
[-]
Abstract:
This thesis deals with the study of light beam propagation through different
nonlinear media. Analytical and numerical methods are used to
show the formation of solitonS in these media. Basic experiments have
also been performed to show the formation of a self-written waveguide in a
photopolymer. The variational method is used for the analytical analysis
throughout the thesis. Numerical method based on the finite-difference forms of the original partial differential equation is used for the numerical
analysis.In Chapter 2, we have studied two kinds of solitons, the (2 + 1) D
spatial solitons and the (3 + l)D spatio-temporal solitons in a cubic-quintic
medium in the presence of multiphoton ionization.In Chapter 3, we have studied the evolution of light beam through a
different kind of nonlinear media, the photorcfractive polymer. We study
modulational instability and beam propagation through a photorefractive
polymer in the presence of absorption losses. The one dimensional beam
propagation through the nonlinear medium is studied using variational and
numerical methods. Stable soliton propagation is observed both analytically
and numerically.Chapter 4 deals with the study of modulational instability in a photorefractive
crystal in the presence of wave mixing effects. Modulational
instability in a photorefractive medium is studied in the presence of two
wave mixing. We then propose and derive a model for forward four wave
mixing in the photorefractive medium and investigate the modulational
instability induced by four wave mixing effects. By using the standard
linear stability analysis the instability gain is obtained.Chapter 5 deals with the study of self-written waveguides. Besides
the usual analytical analysis, basic experiments were done showing the
formation of self-written waveguide in a photopolymer system.
The formation of a directional coupler in a photopolymer system is
studied theoretically in Chapter 6. We propose and study, using the
variational approximation as well as numerical simulation, the evolution
of a probe beam through a directional coupler formed in a photopolymer system.
Description:
Department of Physics,
Cochin University of Science and Technology
Rajagopalan, M S; Dr.Silas, E G(Cochin University Of Science And Technology, July 18, 1992)
[+]
[-]
Abstract:
The situation in the backwaters of Kerala, which
reportedly had about 70,000 ha of mangroves, is unique in the sense that
there has been a total conversion to other uses such as paddy cultivation,
coconut plantation, aquaculture, harbour development and urban development
In order to save and restore what is left over national and international
organisations are mounting pressure on scientists and policy makers
to work out ways and means conserving and managing the mangrove
ecosystems.
In this context, it has been observed in recent years that mangrove
vegetation has remained intact in isolated pockets of undisturbed areas
in the Cochin estuarine system and also that there is resurgence of
mangroves in areas of accretion and silting. The candidate took up the
present study with a view to make an inventory of the existing mangrove
locations, the areas of resurgence, species composition, zonation and other
ecological parameters to understand their dynamism and to suggest a
mangement plan for this important coastal ecosystem
Description:
School Of Marine Sciences
Cochin University Of Science And Technology
Joseph,K J; Dr.Ramachandran Nair,P V(Cochin University Of Science And Technology, August , 1988)
[+]
[-]
Abstract:
The present study is concentrated on a composite group of algae of phy—
toplankton. The algae in the aquatic environment are the most important of
all ch1orophy1l- bearing life on earth on which considerable attention is being
given on account of their supreme status in the aquatic food chain. Though the
higher plants serve as the major primary producers in the terrestrial biocycle,
the primary producers in the aquatic ecosystem especially in the marine environment-" assume unparalleled significance ‘because of their c'ontribution.to the
high magnitude of production generating the fishery resources
Description:
Division Of Marine Biology, Microbiology And Biochemistry
School Of Marine Sciences,Cochin University Of Science And Technology
This thesis deals with some aspects of the Physics of the early universe, like phase transitions, bubble nucleations and premodial density perturbations which lead to the formation structures in the universe. Quantum aspects of the gravitational interaction play an essential role in retical high-energy physics. The questions of the quantum gravity are naturally connected with early universe and Grand Unification Theories. In spite of numerous efforts, the various problems of quantum gravity remain still unsolved. In this condition, the consideration of different quantum gravity models is an inevitable stage to study the quantum aspects of gravitational interaction. The important role of gravitationally coupled scalar field in the physics of the early universe is discussed in this thesis. The study shows that the scalar-gravitational coupling and the scalar curvature did play a crucial role in determining the nature of phase transitions that took place in the early universe. The key idea in studying the formation structure in the universe is that of gravitational instability.
Aquaculture is the dynamic pursuit of production of organisms
from water a process analogous to agriculture on land. The field of
aquaculture is an emerging bioindustry, based upon the culture and husbandry
of economically utilizable aquatic organisms. Of late, there has been a
global upsurge for aquaculture, the main reasons for which include the
requirement of protein source for the increasing world population, the decision
by various world nations to increase the fish yield by developing unutilized
or partially utilized water bodies and depletion of natural stock which is
evident in recent years due to excessive exploitation .The present study has been taken up on the reproductive physiology of the female grey mullet, M. cephalus. The thesis is presented in seven chapters. In the present study, variations in the
major biochemical parameters namely, moisture, proteins, lipids, carbohydrates
cholesterol, carotenoid, ash, calcium and iron in four tissues E. muscle,
liver, ovary and bloodserum of cephalus have been analysed at different maturity stages.
Description:
Centre of Advanced Studies in Mariculture,
Central Marine Fisheries Research Institute,
Bindhu, S G; Dr.Kuriakose, V C(Cochin University of Science and Technology, January , 2000)
[+]
[-]
Abstract:
Nonlinearity is a charming element of nature and Nonlinear Science has now become one of the most important tools for the fundamental understanding of the nature. Solitons— solutions of a class of nonlinear partial differential equations — which propagate without spreading and having particle— like properties represent one of the most striking aspects of nonlinear phenomena. The study of wave propagation through nonlinear media has wide applications in different branches of physics.Different mathematical techniques have been introduced to study nonlinear systems. The thesis deals with the study of some of the aspects of electromagnetic wave propagation through nonlinear media, viz, plasma and ferromagnets, using reductive perturbation method. The thesis contains 6 chapters
Description:
Department
of Physics, Cochin University of Science and Technology
Cherian, C J; Dr.Kurian, C V(Cochin University Of Science And Technology, April 12, 1977)
[+]
[-]
Abstract:
The present work comprises studies on the salinity tolerance
and respiratory metabolism of a mood-boring sphaeromid, Sphaeroma
annandalei, Stabbing and two free living,foulers of the family
Cirolanidae, Cirolana fluviatilis Stabbing and C. uilleyi Stabbing.
Except for the systematic accounts and general observations by
Pillai (1961) and the preliminary studies on the salinity tolerance
and respiration of C. fluviatilis by Nagabhushanam and Gopalakrishnamurthy
(1965, 1965a) very little is known about these isopods From
Indian waters. Studies by John (1968) on the habits, structure,
and development of Sphaeroma terebrans and by Cheriyan (1973) on the
eoéphysiology of the same are the recent major contributions on this
interesting group of animals. 5. annandalei is closely related to
S. terebrans and has been reported to occur on timber along with the
latter (Pillai, 1951). s. gggandalei is a serious pest attacking wood
along the Kerala coast, but detailed works on this species have not
been undertaken so Far
Description:
School Of Marine Sciences,Cochin University Of Science And Technology
Peter, K J; Dr.Kurian, C V(Cochin University of Science And Technology, January , 1982)
[+]
[-]
Abstract:
Though several scientific expeditions surveyed
tha Indian ocean. their findings on larval fishes
were fragmentory and incomplete. During the
International Indian ocean expedition (1960-1965)
zooplankton samples were collected from vast area at
the lndian ocean adopting standard procedures by
participating vessels. These planktons provided an opportunity for a general study of the
zooplanltton as well as their anotomy. abundance and
distribution.. Realising the imortance of the
analysis and classification of fish larvae at the
family level being one of the most important
information required then for the Indian Ocean region
the fish larval portion sorted out from the above
zooplankton samples was allocated to the author by the
UNESCO consultative committee for the Indian Ocean
Biological centre. In spite of the emhasis laid on
The study of the family scombridae. owing to the
paucity of the scombridae material in tne collection.
much could not be done about it.However the record
and description of the very early stages of morakel larvae made in 1967 as part of this study was the first of its kind. The present study on the distribution aspects o fish larva of such large area in the Indian ocean is also unique and first of its kind
Mathew, E J; Dr.Mohammed Yusuff,K K(Cochin University of Science & Technology, November , 1990)
[+]
[-]
Abstract:
The thesis deals with our studies on the synthesis and
elucidation of structure of some metal complexes of dithio
ligands, such as the dithiocarbamates, xanthates and
2-aminocyclopent-1-ene-1-dithiocarboxylate and its N-alkyl
derivatives.2-Aminocyclopent-1-ene-1-dithiocarboxylate (ACDA) is an
interesting ligand, because of its potential dual capability of
bonding between the metal and the ligand. Since the earlier
reports on the complexes of ACDA contain contradictory ideas on
the nature of its bonding, it was thought worthwhile to undertake
a detailed and systematic study of these type of complexes. As
the ACDA complexes have very low solubilities in solvents like
chloroform, we have used the isopropyl derivative of ACDA as the
ligand. The increased solubility of these complexes have made it
possible to investigate their NMR and solution electronic spectra.The complexes of this ligand have not yet been reported in the
literature.We have synthesised some new mixed ligand complexes of
dithiocarbamates by reacting bis(dithiocarbamato)-µ-dichloro
dicopper complexes (obtained by the reaction of mixed benzoic
dithiocarbamic anhydride and copper(II) chloride) with ACDA or its
N-alkyl derivatives.Interactions of metal halides with the mixed anhydrides
formed from benzoylchloride and xanthates have also been
investigated. Novel complexes of the type, [Cu2(RXant)CI]
(R=i-Bu, i-Pr, n-Bu or n-Pr)) have been isolated from the reaction
of copper(II) chloride and the mixed anhydride, and these
reactions appear to be like the clock reactions reported in the
literature.It also deal with the characterisation of
the complexes of the type [Hg(R2d t c )X] (X=Cl, Br or 1),[Cu3(R2dtc)6][Cu2Br6] and [Cu(R2dtc)Cl2](R2=Me2,Et2,Pip,Morph or Pyrr)respectively, synthesised by simple and novel routes,
different from those reported earlier.
Description:
Department of Applied Chemistry, Cochin
University of Science and Technology