Rinku Mariam, Thomas; Dr.George, K E; Dr.Mathew, K T; Dr.Prathapan, S(Cochin University of Science & Technology, May , 2005)
[+]
[-]
Abstract:
The thesis deals with the preparation and dielectric characterization of
Poly aniline and its analogues in ISM band frequency of 2-4 GHz that includes part
of the microwave region (300 MHz to 300 GHz) of the electromagnetic spectrum
and an initial dielectric study in the high frequency [O.05MHz-13 MHz].
PolyaniIine has been synthesized by an in situ doping reaction under different
temperature and in the presence of inorganic dopants such as HCl H2S04, HN03,
HCl04 and organic dopants such as camphorsulphonic acid [CSA],
toluenesulphonic acid {TSA) and naphthalenesulphonic acid [NSA]. The variation
in dielectric properties with change in reaction temperature, dopants and
frequency has been studied. The effect of codopants and microemulsions on the dielectric properties has also been studied in the ISM band. The ISM band of
frequencies (2-4 GHz) is of great utility in Industrial, Scientific and Medical (ISM)
applications. Microwave heating is a very efficient method of heating dielectric
materials and is extensively used in industrial as well as household heating
applications.
Description:
Department of
Polymer Science and Rubber Technology,Cochin University of Science and
Technology
Rahana, Yoosuf; Dr.Jayaraj, M K(Cochin University of Science & Technology, October , 2007)
[+]
[-]
Abstract:
Two stage processes consisting of precursor preparation by thermal
evaporation followed by chalcogenisation in the required atmosphere is
found to be a feasible technique for the PV materials such as n-Beta In2S3,
p-CulnSe2, p-CulnS2 and p-CuIn(Sel_xSx)2. The growth parameters such as
chalcogenisation temperature and duration of chalcogenisation etc have been
optimised in the present study.Single phase Beta-In2S3 thin films can be obtained by sulfurising the indium
films above 300°C for 45 minutes. Low sulfurisation temperatures required
prolonged annealing after the sulfurisation to obtain single phase Beta-1n2S3,
which resulted in high material loss. The maximum band gap of 2.58 eV was
obtained for the nearly stoichiometric Beta-In2S3 film which was sulfurised at
350°C. This wider band gap, n type Beta-In2S3 can be used as an alternative to
toxic CdS as window layer in photovoltaics .The systematic study on the structural optical and electrical properties of
CuInSe2 films by varying the process parameters such as the duration of
selenization and the selenization temperature led to the conclusion that for
the growth of single-phase CuInSe2, the optimum selenization temperature is
350°C and duration is 3 hours. The presence of some binary phases in films
for shorter selenization period and lower selenization temperature may be
due to the incomplete reaction and indium loss. Optical band gap energy of
1.05 eV obtained for the films under the optimum condition.In order to obtain a closer match to the solar spectrum it is desirable to
increase the band gap of the CulnSe2 by a few meV . Further research
works were carried out to produce graded band gap CuIn(Se,S)2 absorber
films by incorporation of sulfur into CuInSe2. It was observed that when the
CulnSe2 prepared by two stage process were post annealed in sulfur atmosphere, the sulfur may be occupying the interstitial positions or forming
a CuInS2 phase along with CuInSe2 phase. The sulfur treatment during the
selenization process OfCu11 ln9 precursors resulted in Culn (Se,S)2 thin films.
A band gap of 1.38 eV was obtained for the CuIn(Se,S)2.The optimised thin films n-beta 1n2S3, p-CulnSe2 and p-Culn(Sel-xSx)2 can be
used for fabrication of polycrystalline solar cells.
Description:
Department of Physics,
Cochin University of Science and Technology
Vineetha, C P; Dr Babu, C.A(Cochin University of Science and Technology, June 22, 2015)
[+]
[-]
Abstract:
The renewable energy sources (RES) will play a vital role in the
future power needs in view of the increasing demand of electrical
energy and depletion of fossil fuel with its environmental impact. The
main constraints of renewable energy (RE) generation are high capital
investment, fluctuation in generation and requirement of vast land area.
Distributed RE generation on roof top of buildings will overcome these
issues to some extent.
Any system will be feasible only if it is economically viable and
reliable. Economic viability depends on the availability of RE and
requirement of energy in specific locations. This work is directed to
examine the economic viability of the system at desired location and
demand.
Ajitha, S; Dr.Sugunan, S(Cochin University of Science and Technology, September , 2008)
[+]
[-]
Abstract:
Mesoporous materials are of great interest to the materials community because of their potential applications for catalysis,separation of large molecules,medical implants,semiconductors,magnetoelectric devices.The thesis entitled 'Ordered Mesoporous Silica as supports for immobilization of Biocatalyst' presents how the pore size can be tuned without the loss in ordered structure for the entrapment of an industially important biocatalyst-amylase.Immobilization of enzymes on ordered mesoporous material has triggered new ooportunities for stabilizing enzymes with improved intrinsic and operational stabilities.
Description:
Department of Applied Chemistry,
Cochin University of Science and Technology
Kannan, V; Dr. Sreekumar, K(Cochin University of Science & Technology, August , 2011)
[+]
[-]
Abstract:
Catalysis is a technologically important field which determines the quality of life in future. Catalyst research in pharmaceutical industry,fine chemical synthesis and emission control demands supported catalysts in bulk quantities.In the present work it was observed that clay supported catalysts mentioned in various chapters could also be used for the synthesis of similar molecules. The K10Ti catalyst can be used for the synthesis similar substituted imidazole derivatives under solvent free conditions and synthetically important Mannich bases of substrates containing various substitutes.Al-pillared saponite can be used for acetalation of other polyhydroxy compounds like glycerol,mannitol etc.Cu-Pd KSF catalyst has found application in C-C bond forming reactions which can be applied to other reactions and similar methods can be adopted for the synthesis of other catalyst by changing the transition metals. Montmorillonite K10 catalysed synthesis of triarylpyridines can be extended to the synthesis tetrasubstuted pyroles.K10Ti can also be utilized for the synthesis of similar heterocycles.
Description:
Dept.of Applied Chemistry,Cochin University of Science and Technology
Jacob,T V; Dr.Ramachandra, Poduval P(Cochin University of Science and Technology, March 30, 1990)
[+]
[-]
Abstract:
The term 'organisation' is used in different contexts. In this study,
organisation is considered as a 'socio—technical system. Alienation, as a term and as a theme, are found in many writings from very early times. But the concept and emphasis differ. The writers who have explained alienation includes theologians, philosophers, anthropologists, economists, political scientists, historians, psychologists and sociologists
Description:
School of Management Studies, Cochin University of
Science and Technology
Srinivasa, Gopal T K; Dr. Hridayanathan, C(Cochin University of Science and Technology, April 28, 1993)
[+]
[-]
Abstract:
Packaging is important not only in extending the shellife of fish and fishery products but also improving their marketability. In the recent years, significant development have taken place in the packaging industry. During the past decade in India, there is almost a packaging revolution with the availability of variety packaging materials, thus generating better packaging consciousness in other producer/manufacturing industries. But unfortunately, such realisation is not forthcoming in the fisheries sector and packaging techniques for local and export trade continues to be on traditional lines with their inherent drawbacks and limitations. Better packaging ensures improved quality and presentation of the products and ensures higher returns to the producer. Among several packaging materials used in fishery industry, ISI specifications had been formulated only for corrugated fibre board boxes for export of seafoods and froglegs. This standard was formulated before containersiation came into existance in the export of marine products. Before containerisation, the standards were stringent in view of the rough handling, transportation and storage. Two of the common defects reported in the master cartons exported from India are low mechanical strength and tendency to get wet. They are weakened by the deposits of moisture caused by temperature fluctuations during loading, unloading and other handling stages. It is necessary to rectify the above defects in packaging aquatic products and hence in the present study extensive investigations are carried out to find out the reasons for the damage of master cartons, to evolve code of practice for the packaging oi frozen shrimp for exports, development of alternative style of packaging for the shipping container, development of suitable consumer packaging materials for fish soup powder, cured dried mackeral, fish pickles in oil and frozen shrimp. For the development of suitable packaging materials, it is absolutely essential to know the properties of packaging materials, effect of different packaging materials on theirshelf life and their suitability for food contact applications.
Description:
Department
of Industrial Fisheries, Cochin University of Science and
Technology
Rani, Rajan; Dr.Radhakrishnan, K V(Cochin University Of Science And Technology, April , 2013)
[+]
[-]
Abstract:
The reactions involving fulvenes and its derivatives have received a great
deal of attention over the years in synthetic organic chemistry. Functionalizations
of fulvenes provide versatile and powerful approaches to various polycyclic
systems and natural products. They serve as versatile intermediates in the
construction of various ring systems through inter- as well as intramolecular
cycloadditions. Compared to the rich literature on the cycloaddition reactions of
pentafulvenes, much less attention has been paid to the synthetic utilization of
their cycloadducts. Tactical manipulations on the chosen adduct offer the
prospects for designing a variety of useful molecular skeletons.
Addition of heterodienophiles to fulvenes offers an efficient strategy towards
the synthesis of azabicyclic olefins. However, there have been no serious attempts
to study the synthetic utility of these substrates. In this context and with the
intention of utilizing pentafulvenes towards synthetically important molecules, author
decided to explore the reactivity of pentafulvene derived azabicyclic olefins. Our
attention was focused on the synthetic potential associated with the ring opening
of fulvene derived bicyclic hydrazines under palladium catalysis. It was envisioned
that the desymmetrization of these adducts using various soft nucleophiles will
provide a novel access to synthetically and biologically important alkylidene
cyclopentenes. The investigations along this line form the focal theme of this
thesis entitled “PALLADIUM CATALYZED CARBONCARBON/
CARBON-HETEROATOM BOND FORMATION REACTIONS
UTILIZING PENTAFULVENE DERIVED BICYCLIC HYDRAZINES
Description:
Organic
Chemistry Section, National Institute for Interdisciplinary Science and Technology
Sunny, George; Dr.Mary,Joseph(Cochin University of Science And Technology, 1991)
[+]
[-]
Abstract:
Paper industry is one of the oldest and largest industries in
Kerala. Despite the developments in the industry in terms of
growth in output , value added and employment generation, many of
the units face grave problems. Irrespective of the size of the
plant, the problems of the industry are general in nature. The
problems are galore in the supply, not the demand side. Amomg the
problems, the important ones are: raw material scarcity, energy
deficiency and obsolete technology. Further, the industry is
subject to many controls by the Government — price control,
product control and raw materials control — which result in the
dwindling of profits and investments. Equally important are the
reservations against the industry for polluting the environment byeffluent disposal on the one hand and affecting ecological balance
by depleting the existing forest on the other.
Apart from the large, medium and small pulp and paper mills,
there are about 30 hand made paper units in Kerala which can be
categorised as village and cottage industry. Almost all of these
units began at the initiative and support of Khadi and Village
Industries Commission. The primary purpose of these units is
employment generation, and not profit making. Currently many of
these units are in the red and many others are on the verge of
closure. Therefore, a separate analysis of the growth
performance, and problems and prospects of the hand made paper
industry has also been attempted. It is analysed separately
because of the very small size of the hand made paper units
Description:
Department of Applied Economics, Cochin University of Science and Technology
Jalajakumar,V S; Dr.Kuttyamma, V J(Cochin University of Science And Technology, August , 1988)
[+]
[-]
Abstract:
In order to check the damage caused by the parasites, even though it is difficult in open waters, a proper understanding of the seasonal variation in the distribution of the parasite and other factors like age of the host, sex of the host, which affect distribution of parasite is a must. Although several workers have carried out investigations on the taxonomy of metazoan parasites of marine and brackish water Fishes of India, very little attempt is made to correlate such investigations with the host and the environment. In this thesis such an attempt is made by the researcher.
In chapter one the literature related to the prevalence, mean intensity of infection, and histopathological changes caused by the metazoan parasites, in particular by helminths, copepods and isopods, was reviewed. Chapter two contains observations on the distribution pattern of parasites in relation to the season, sex, and size of the host. It was found that the prevalence rate of radiorynchus_indicus infecting the alimentary canal of Tachysurugs mgacuglatus, Ergasilus sp. infecting the gills of T maculatus, and Lernaeeniicus ramosus found on the body surface of Qeimgipteirfugs jagonicus was higher during monsoon season. But agarna malayi found in the opercular chamber and Ehilometra cephalus infecting the gonads of valamugil speiglari showed a higher prevalence rate during the postmonsoon season. This was discussed on the basis of the hydrographical characteristics prevailing in the study area during the three different seasons.
It was also observed that the sex of the host did not influence significantly the distribution pattern of the parasites. The reasons for this were also discussed. Invariably, the size of the host
was found to influence the parasite distribution pattern. It was observed that the prevalence rate showed an increase with increase in size of the fish. This was discussed on the basis of food habits of the host, along with other aspects An attempt was made in chapter three to study the histopathological effects of‘ the various parasites on their respective sites of attachments on host Fishes. It was found that except Rhadinorhyhchugs indicus, all other parasites produced damages of varying intensity, in the form of hypertrophy, rhyperplasia, haemorrhage, tissue disruption and ulcers. Interestingly, E. indicus, an acantho— cephalid with a powerful proboscis for attachment was found not to cause any serious damage to the intestine of the host Fish. All these aspects are included in the third and final chapter of the thesis.
Description:
School of marine sciences, Cochin University of Science And Technology