Suja, Haridas; Dr.Sugunan, S(Cochin University of Science & Technology, January , 2002)
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Abstract:
The present project was a systematic investigation of the
physico-chemical properties and catalytic activity of some transition metal promoted
sulphated zirconia systems. The characterisation and catalytic activity results were
compared with that of pure Zr02 and simple sulphated zirconia systems. Sulphated
zirconia samples were prepared by a controlled impregnation technique. In the case of
metal incorporated systems, a single step impregnation was carried out using required
amounts of sulphuric acid and metal salt solutions. As a preliminary step, optimisation of
calcination temperature and sulphate content was achieved. For further studies, the
optimised sulphate loading of 10 ml per gram of hydrous zirconium oxide and a
calcination temperature of 700°C was employed. Metal incorporation had a positive
influence on the physico-chemical properties. Vapour phase cumene conversion served as
a test reaction for acidity. Some industrially important reactions like Friedel-Crafts
reaction, phenol hydroxylation, nitration, etc. were selected to test the catalytic activity of
the prepared systems.
Description:
Department of Applied Chemistry,
Cochin University of Science and Technology
Sreeja Rani, K; Prathapan,S; Sugunan, S(Department of Applied Chemistry,Faculty of Science, 2002)
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Abstract:
Catalysis is an essential technology in manufacturing industries. The investigation based on supported vanadia catalysts and it’s sulfated analogues. Vanadia is a transition metal oxide and is used in oxidation reactions in chemical industry. It is more active and selective catalysts on suitable supports. The work deals with preparation of vanadia incorporated tin oxide and zirconia systems by wet impregnation. Physico-chemical characterization using instrumental techniques like BET etc. The surface acidic properties were determined by the ammonia TPD studies, Perylene absorption studies and Cumene conversion reaction. The catalytic activities of the prepared systems are tested by Friedel-Crafts benzylation of arenes and Bechmann rearrangement of Cyclohexanol oxime. Here the rector reactions are relatively rare. So to test the application of the catalyst systems for the selective oxidation of cyclohexanol to cyclohexanone and finally evaluate the catalytic activity of the systems for the vapour phase oxidative dehydrogenation of Ethylbenzene, which leads to the formation of
Industrially important compound ‘styrene’ is another objective of this work
Sriramachandra Murty, V(Cochin University of Science and Technology, August , 1995)
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Abstract:
This thesis Entitled Studies on certain exploited marine Finfish Resources of india.Marine fish catch forecasting is short term or long term basis for purposes of explation and management. Among the short term forecasts, two approaches need serious consideration in India: 1. to improve the methods of understanding the influence of environmental characteristics on the abundance or availability of fish in different areas in different periods and to make the forecasts of the same, 2. to make analysis of time series catch data (ARIMA models) to make forecasts of catch in the next year or in a particular period during next year. There is some evidence of suitability of these approaches to Indian marine fisheries but attempts aiming at comprehensive studies should be made. In the area of long term forecasts, considerable work is done in India on single species assessments but in the context of multi species, multigear nature of Indian marine fisheries, assessments of all species together in a mixed fishery are urgently required for effective managements of fisheries.
Description:
School of Marine Scxience, Cochin University of Science and Technology
Chitra, R Nayak; Dr.Kuriakose, V C(Cochin University of Science and Technology, October , 2008)
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Abstract:
The main goal of this thesis is to study the dynamics of Josephson
junction system in the presence of an external rf-biasing.A system of
two chaotically synchronized Josephson junction is studied.The change in the dynamics of the system in the presence of at
phase difference between the applied fields is considered. Control of
chaos is very important from an application point of view. The role
Of phase difference in controlling chaos is discussed.An array of three Josephson junctions
iS studied for the effect of phase difference on chaos and synchronization
and the argument is extended for a system of N Josephson junctions. In the presence of a phase difference between the external
fields, the system exhibits periodic behavior with a definite phase relationship
between all the three junctions.Itdeals with an
array of three Josephson junctions with a time delay in the coupling
term. It is observed that only the outer systems synchronize while
the middle system remain uncorrelated with t-he other two. The effect
of phase difference between the applied fields and time-delay on
system dynamics and synchronization is also studied. We study the influence of an applied ac biasing on a serniannular
Josephson junction. It is found the magnetic field along with the
biasing induces creation and annihilation of fluxons in the junction.
The I-V characteristics of the junction is studied by considering the
surface loss term also in the model equation. The system is found to
exhibit chaotic behavior in the presence of ac biasing.
Description:
Department of Physics,
Cochin University of Science and Technology
Lucy,Joseph; Dr.Sivasankara Pillai, V N(Cochin University Of Science And Technology, December 10, 1987)
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Abstract:
Ion-exchange chromatography has emerged
as a practical and rapid method of separation and
analysis. A review of literature on chelating
resins reveals that eventhough investigations on
highly selective resins are intensively pursued
from early 1940s, such resins are still insufficiently
used in analytical chemistry and process
technology. This is mainly due to the complexity
of their synthesis and high cost. In this context,
it is worthwhile to develop novel chelating resins
which are specific or at least selective towards
a group of metal ions. Synthesis, characterization
and analytical applications of two such resins are
presented in this thesis.
Description:
Department of Applied Chemistry, Cochin University of
Science and Technology
Lakshmi,M; Sudha Kartha, C(Department of Physics, 2001)
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Abstract:
Chemical bath deposition (CBD)is one of the simplest, very convient and probably the cheapest method for thin film preparation. Photovoltaic is the cleanest and the most efficient mode of conversion of energy to electrical power. Silicon is the most popular material in this field. The present study on chemical bath deposited semiconducting copper selenide and iron sulfide thin films useful for photovoltaic applications. Semiconducting thin films prepared by chemical deposition find applications as photo detectors, solar control coatings and solar cells. Copper selenide is a p-type semiconductor that finds application in photovolitics. Several heterojunction systems such as Cu2-xSe/ZnSe (for injection electro luminescence), Cu2Se/AgInSe2 and Cu2Se/Si (for photodiodes), Cu2-xSe/CdS, Cu2-xSe/CdSe, CuxSe/InP and Cu2-xSe/Si for solar cells are reported. A maximum efficiency of 8.3% was achieved for the Cu2-xSe/Si cell, various preparation techniques are used for copper selenide like vacuum evaporation, direct reaction, electrodeposition and CBD. Instability of the as-prepared films was investigation and is accounted as mainly due to deviation from stoichiometry and the formation of iron oxide impurity. A sulphur annealing chamber was designed and fabricated for this work. These samples wee also analysed using optical absorption technique, XPS (X-ray Photoelectron Spectroscopy) and XRD.(X-Ray Diffraction).The pyrite films obtained by CBD technique showed amorphous nature and the electrical studies carried out showed the films to be of high resistive nature. Future work possible in the material of iron pyrite includes sulphur annealing of the non-stochiometric iron pyrite CBD thin films in the absence of atmospheric oxygen
Ivy,Thomas; Dr.Chandramohan, D(Cochin University Of Science And Technology, April 21, 1982)
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Abstract:
The thesis is proposed to study the occurrence and distribution
of chitinoclasts in water, sediment and fauna as
related to site characteristics such as temperature,
salinity, depth of water, pH, etc. Since no information
is available on the chitinolytic properties of coastal
strains, it is also proposed to study the chitinolytic
activity of the bacterial isolates in relation to various
environmental conditions. It is also planned to work out the taxonomy of some of the representative isolates and certain kinetic properties of their chitinases. It is expected that the results of the study would yield a comprehensive information-on the chitinoclastic bacteria in the southern coastal zone of
west coast of India.
Description:
Department Of Marine Sciences,Cochin University Of Science And Technology
Sanjeev, S; Dr.Joseph, Stephen(Cochin University of Science and Technology, February 5, 1990)
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Abstract:
In India much work has been done on different aspects of quality of
processed fish and fishery products (Pillai et al., 1965; Iyer and Chaudhuri,
1966; Iyer et al., 1966; Sreenivasan and Joseph, 1966; Pillai and Rao, 1969;
Mathen et al., 1975; Valsan et al., 1985) and standards have been formulated
for almost all the fishery products. Quality standards for fresh fish cover
only a few fish species available in the markets. For the formulation and
recommendation of quality standards for fish and fishery products for domestic
trade detailed background informations are necessary. Khot et al., (1982),
Valsan et al. J (1985) and Iyer et al. (1986) have reported on the bacterial
flora of sea foods at retail level in Bombay. Cochin is a major fish landing
centre of the south west coast of India, and an average of 25,000. tonnes
of fish/shell fish are landed annually at this harbour which is about 10 percent
of the total catch of fish in Kerala (Lakshmanan -et -al., 1984). All the
varieties of marine, brackish water and fresh water fishes are available in
Cochln throughout the year for catering to Its cosmopolitan. population and
informations regarding their bacteriological quality are scanty. Hence the
present study was undertaken to investigate the bacteriological quality of fish
and fishery products available in the markets and cold storages situated in
and around Cochin meant for internal consumption.
Description:
Central Institute of Fisheries Technology,
Cochin University of
Science and Technology
Princy,K G; Dr.Rani,Joseph; Dr.Sudha Kartha,C(Cochin University of Science & Technology, June , 2002)
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Abstract:
The primary aim of this work has been to develop conductive silicone and
nitrile rubbers, which are extensively used for making conductive pads in telephone
sets, calculators and other applications. Another objective of the work has been to
synthesise and characterize novel conducting polymers based on glyoxal and
paraphenylenediamine- poly(p-phenylenediazomethine. Conducting polymer
matrices were developed from polymer blends such as poly(pphenylenediazomethine),
polyethylene, PVC and silica and their properties were
studied.
Description:
Department of Polymer Science and Rubber Technology,Cochin University of Science
and Technology
Rani, Joseph(John Wiley & Sons,Inc., December 29, 1997)
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Abstract:
ABSTRACT: The electrical conductivity of silicone rubber vulcanizates containing carbon
blacks [e.g., acetylene black, lamp black, and ISAF (N-234) black] were investigated.
The change in electrical conductivity with varying amounts of carbon blacks and the
temperature dependence was measured. The mechanical properties like tensile
strength, tear strength, elongation at break, hardness, etc., of the vulcanizates were
determined. A comparative study of the electrical conductivity of the composites revealed
that the electrical conductivity of the composites made with acetylene black was
higher than that of the composites made of other blacks.
Asok Kumar,K; Dr.Shahul,Hameed M(Cochin University of Science & Technology, 1990)
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Abstract:
The present study of the parasitic copepods gives the taxonomic description of thirty one species of parasites collected from various elasmobranch fishes of Kerala coast. Copepods parasitic on fishes include three sub orders, viz. poecilostomatoida, cyclopoida and siphonostomatoida. Parasitic copepods of elasmobranch fishes for the present study were collected from different fish landing centres of Kerala and by undertaking regular fishing trips. The collected parasites are identified to the species level and described. It is found that out of thirty one species, fifteen are new to science. They belong to the genera viz. Nothobomolochus Vervoot, 1962, Caligus Muller, 1785, Alebion, Kroyer, 1863, Gloipotes Steenstrup and Lutken, 1861, Pandarus Leach,1819, Perissopus Steenstrup and Lutken, 1861, Echthrogaleus Steenstrup and Lutken, 1861 and Kroyeria van Beneden, 1853. Fifteen new host records were reported. Two genera viz. Echthrogaleus and Entepherus were reported for first time from Indian waters. A new genus called Penicillus was erected. The general observations made during this study revealed certain interesting aspects of host-parasite relationship, host specificity, site specificity, adaptive modifications and geographical distribution.
Description:
Department of Industrial Fisheries, Cochin University of Science and Technology
Rashiba, A P; Dr.Saramma, Panampunnayil U(Cochin University of Science And Technology, April 9, 2010)
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Abstract:
The main objectives of the study are: To study the seasonal distribution of copepods with special reference to their qualitative and quantitative distribution, with notes on biodiversity in the Andaman Sea and the Bay of Bengal.
To study the spatial and temporal distribution of copepods in the Andaman Sea
and the Bay of Bengal.To understand the hydrography and the environmental characteristics of the Andaman Sea and the Bay of Bengal and their role in the distribution and biomass of copepods.To study the vertical migration/diurnal migration of the copepods.
To study the difference between the coastal and oceanic composition of copepods
in the study area and the factors responsible for it.
Description:
National Institute of Oceanography, Regional Centre, Kochi