Sarun, P M; Dr.Syamaprasad,U(National lnstitute for Interdisciplinary Science and Technology, June , 2010)
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Abstract:
The objective of the present work is to study the effect of rare-earth (RE)
doping on the superconducting properties of (Bi,Pb)-2212 system and to develop
novel superconductors in the system with improved properties, especially,
the self- and in-field critical current densities so as to use them for practical
applications. This dissertation describes a range of findings in Bi-based
superconductor using the cationic substitution of rare earth (RE) elements.
Most of the experiments reported here take advantage of the difference in the
valency and ionic radii of dopant and doping site.
The main objective of the study was primarily to determine the effect of hydrographical parameters especially nutrients which were supplied externally to the seawater while culturing the diatom Chaetoceros calcitrans, under laboratory conditions, and to determine its optimum concentration for ideal growth of the culture, in such a condition of increased rate of pollution due to the industrialization and effluents. Also an attempt was made to study the possible correlation of diatom abundance in the South west Coast of India with the landings of the pelagic fishery resources, especially sardine, mackerel and anchovy, since these fishes are largely diatom feeders. Positive correlation was found between the diatoms and pelagic fish landings of Thalassery and Vizhinjam area while at Cochin there was less significant correlation between the two variables
Mohanan, Choran; Dr.Jyoti, Sharma K(Cochin University of Science And Technology, May , 1994)
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Abstract:
Bamboos are vulnerable to various diseases which affect them in
nurseries, plantations as well as in natural stands. In India, rot and
blight of emerging culms have already been identified as the limiting
factor of the bamboo production in many bamboo growing areas,
especially in the coastal belts of Orissa (Jamaluddin et a1., 1992).
Similarly, foliage blight and rust have been recorded to pose threat
to nursery as well as outplanted seedlings which are in the early
establishnent phase (Bakshi et a1., 1972; Harsh et a1., 1989). With
the increased emphasis and priority on raising multipurpose tree
species, large—scale planting of bamboos has been initiated recently
in the State. Limited experience in raising the bamboo seedlings
together with the lack of information on bamboo diseases and their
control measures often resulted in partial to complete failure of many
nurseries. Also, poor handling of bareroot seedlings for outplanting
affected seriously the planting programme. This was clearly reflected
by the large-scale nortality of outplanted young seedlings reported
from many plantations. So far, no systanatic attempt has been made to
study the diseases affecting bamboos in nurseries, plantations and
natural stands in the country. Hence, the present investigation was
taken up to conduct a systematic study of the diseases affecting
bamboos in Kerala.
Description:
Division of forest pathology, Kerala forest research institute
Subhash, Chander; Dr.Diwan, A D(Cochin University of Science and Technology, November , 1986)
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Abstract:
In the present study, the main emphasis was to find out it seasonal and ecosystem specific variations of calcium magnesium, phosphorus, copper and zinc in the water and the
sediment has any role to play in altering the concentration of these elements in different tissues of intermoult p.indicus as evidenced by the seasonal studies in the grow out
and the marine ecosystems
Description:
Centre of advanced studies in mariculture, Central marine fisheries research institute
Job,Kuriakose Aerankavil; Dr.Rani,Joseph(Cochin University of Science and Technology, November 30, 1996)
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Abstract:
The distribution of curing agents and fillers in the
constituents of an elastomer blend is an important factor
which determines the curing behaviour and vulcanizate
properties of the blend. The distribution of curatives and
fillers largely depends on the nature of elastomers. The
curatives tend to migrate preferentially to the rubber of
higher unsaturation and/or higher polarity, and reinforcing
fillers tend to get distributed in the low viscosity phase,
resulting in inferior mechanical properties of the blends.
The thesis suggests several methods for improving
mechanical properties of blends like NBR/butyl, NR/butyl,
NBR/EPDM and NR/.
Description:
Department of Polymer Science and Rubber
Technology, Cochin University of Science and Technology
Edwin, Xavier; Dr.Girijavallabhan,C P(Cochin University of Science & Technology, March , 1997)
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Abstract:
The present thesis is centered around the study of electrical and thermal
properties of certain selected photonic materials.We have studied the electrical conduction mechanism in various
phases of certain selected photonic materials and those associated with different phase
transitions occurring in them. A phase transition leaves its own impressions on the key
parameters like electrical conductivity and dielectric constant. However, the activation
energy calculation reveals the dominant factor responsible for conduction process.PA measurements of thermal diffusivity in certain other important photonic
materials are included in the remaining part of the research work presented in this
thesis. PA technique is a promising tool for studying thermal diffusivities of solid
samples in any form. Because of its crucial role and common occurrence in heat flow
problems, the thermal diffusivity determination is often necessary and knowledge of
thermal diffusivity can intum be used to calculate the thermal conductivity. Especially,knowledge of the thermal diffusivity of semiconductors is important due to its relation
to the power dissipation problem in microelectronic and optoelectronic devices which
limits their performances. More than that, the thermal properties, especially those of
thin films are of growing interest in microelectronics and microsystems because of the
heat removal problem involved in highly integrated devices. The prescribed chapter
of the present theis demonstrates how direct measurement of thermal diffusivity can be
carried out in thin films of interest in a simple and elegant manner using PA techniques.
Although results of only representative measurements viz; thermal diffusivity values in
Indium, Aluminium, Silver and CdS thin films are given here, evaluation of this
quantity for any photonic and / electronic material can be carried out using this
technique in a very simple and straight forward manner.
Description:
International School of Photonics,Cochin University of Science and Technology
Muraleedharan,Pillai S; Dr.Girijavallabhan,C P(Cochin University of Science And Technology, March , 1984)
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Abstract:
The subject of electroluminescence has currently acquired great importance because of its potential applications in display systems of a wide variety. A large number of scientists working in commercial, governmental as well as academic institutions all over the world are at present
engaged in the intense effort to develop new and efficient phosphor materials and electroluminescent devices. This thesis presents the work carried out by the author in this
field during the past few years. The studies discussed in this thesis are mostly confined to
the development of some new phosphor materials, their uses in powder and thin film electroluminescent devices and to their electrical and spectral characteristics. Care has been taken to bring' out the physics involved in all the above aspects of the phenomenon
Description:
Department of physics, Cochin University of Science And Technology
Kerala Varma, K; Dr.Kurup, P G(Cochin University of Science and Technology, April , 1989)
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Abstract:
The thesis focused Studies on Energy Exchange and Upper Ocean Thermal Structure in Arabian Sea and Heat Transport in Northern Indian Ocean. The present thesis is an attempt to understand the upper ocean thermal characteristics at selected areas in the western and eastern
Arabian Sea in relation to surface energy exchange and dynamics, on a climatological basis. It is also aimed to examine, the relative importance of different processes in the evolution of SST at the western and eastern Arabian Sea. Short-term variations of energy exchange and upper ocean
thermal structure are also investigated. Climatological studies of upper ocean thermal structure and surface energy exchange in the western and eastern parts of Arabian Sea bring out the similarities/differences and the causative factors for the observed features. Annual variation of zonally averaged heat advection in north Indian Ocean shows that maximum export of about
100 W/m2 occurs around 15ON during southwest monsoon season. This is due to large negative heat storage caused by intense upwelling in several parts of northern Indian Ocean. By and large, northern Indian Ocean is an area of heat export
Description:
Physical Oceanography and Meteorology Division, School of Marine Sciences, Cochin University of Science and Technology
Padmini,R; Dr.Murthy, A V S(Cochin University of Science And Technology, April , 1981)
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Abstract:
There are only a few attempts in the Indian ocean to evolve reliable climatic models of energy exchange fluxes and to study their inter annul variations. Large space scale and time history of the flux fields could be estimated by the bulk aerodynamic exchange and radiation equation, making use of the climatic normal’s of the related parameters derived from the remarkably good amount of surface marine observations compiled and made available on magnetic tape TDF II by the national climatic centre of NOAA for the period of years 1854 –early 1973. In this thesis the author has made an attempt to calculate the thermal energy exchange fluxes in a meaningful way, using the bulk aerodynamic coefficients which depend on the changes in the wind speed. The spatial and temporal distribution of the exchanges of energy between the ocean and atmosphere , are presented and their impact on the climatic variations of the Indian ocean are discussed from the point of view of predominating air sea interaction processes.
Description:
School of marine sciences, Cochin University of Science And Technology
Boopendranath, M R; Dr.Shahul,Hameed M(Cochin University of Science and Technology, September , 2000)
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Abstract:
Present work deals with the studies on energy requirement and convervation in selected fish harvesting systems.Modem fishing is one of the most energy intensive methods of food production. Fossil fuels used for motorised and mechanised fishing are nonrenewable and limited. Most of the environmental problems that confront mankind today are connected to the use of energy in one way or another. Code of Conduct for Responsible Fisheries (FAO, 1995) highlights the need for efficient use of energy in the fisheries sector. Information on energy requirement in different fish harvesting systems, based on the principles of energy analysis, is entirely lacking in respect of Indian fisheries. Such an
analysis will provide an unbiased decision making support for maximising the yield per unit of non-renewable energy use, from different fishery resource systems, by rational deployment of harvesting systems. In the present study, results of investigations conducted during 1997-2000 on energy requirement in selected fish harvesting systems and approaches to energy conservation in fishing, are presented along with a detailed description of the fish harvesting systems and their operation. The content of the thesis is organised into 8 Chapters.
Description:
School of Industrial Fisheries, Cochin University of Science and Technology
Muraleedharan,P M; Dr.Sharma,G S(Cochin University of Science and Technology, September , 1984)
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Abstract:
This thesis is an outcome of the studies, carried out by the author on the Equatorial Undercurrent
and the Equatorial Jet, an interesting and unique phenomenon discovered, recently, in the Indian Ocean (wyrtxi, 1973). The main objective of the thesis is to carry out a detailed investigation of the seasonal, latitudinal and longitudinal variation of the Equatorial Undercurrent in the Indian Ocean and also the Equatorial Jet, through mapping the vertical distribution of the oceanographic properties across the equator along various longitudes for all the months of an year, between SON and SOS, utilising the oceanographic data collected during the International Indian Ocean Expedition and subsequently in the equatorial Indian Ocean. As the distribution of the hydrographic properties give only a qualitative identification of the Undercurrent, a novel technique of computing the zonal flux through bivariate distribution of salinity and thermosteric anomaly introduced by Montgomery and Stroup (1962), is adopted in order to have a quantitative variation of the Equatorial Undercurrent and the Equatorial Jet. Finally, an attempt
is made to give a plausible explanation of the features observed.
Description:
School of marine sciences, Cochin University of Science And Technology
Bindhumol, I; Dr. Madhavan Nampoothiri, K(Cochin University of Science and Technology, May 22, 2012)
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Abstract:
The thesis mainly discussed the isolation and identification of a probiotic Lactobacillus plantarum, fermentative production of exopolysaccharide by the strain, its purification, structural characterisation and possible applications in food industry and therapeutics. The studies on the probiotic characterization explored the tolerance of the isolated LAB cultures to acid, bile, phenol, salt and mucin binding. These are some of the key factors that could satisfy the criteria for probiotic strains .
The important factors required for a high EPS production in submerged fermentation was investigated with a collection of statistical and mathematical approach. Chapter 5 of the thesis explains the structural elucidation of EPS employing spectroscopic and chromatographic techniques. The studies helped in the exploration of the hetero-polysaccharide sequence from L. plantarum MTCC 9510. The thesis also explored the bioactivities of EPS from L. plantarum. As majority of chemical compounds identified as anti-cancerous are toxic to normal cells, the discovery and identification of new safe drugs has become an important goal of research in the biomedical sciences. The thesis has explored the anti-oxidant, anti-tumour and immunomodulating properties of EPS purified from Lactobacillus plantarum. The presence of (1, 3) linkages and its molecular weight presented the EPS with anti-oxidant, anti-tumour and immunomodulating properties under in vitro conditions.
Description:
Division of Biotechnology,National Institute for Interdisciplinary science and Technology, Thiruvananthapuram
Jasmine, Koshy; Dr.Padma, Nambisan(Cochin University Of Science And Technology, December 3, 2012)
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Abstract:
Commercially, Pleurotus spp. of mushroom are cultivated in bags. After mushroom cultivation, spent substrate remains as residual material. Proper recycling of spent substrate is beneficial for our economy. Spent substrate can be utilized for various other value added purposes through the proper knowledge of its components. Composition of various components depends on the activity of extracellular enzymes in the spent substrate. The present study was conducted to know the enzyme profile of some major extracellular enzymes - cellulase, hemicellulase (xylanase), pectinase and ligninase (lignin peroxidase and laccase) and to estimate cellulose, hemicellulose, pectin and lignin in the substrate. The use of spent substrate as a source of fibre and ethanol, and in the biodegradation of phenol by Pleurotus spp. was also investigated
Description:
Department of Biotechnology, Cochin University of Science and Technology