Nisha,N R; Singh,A D(Department of Marine Geology and Geophysics,Faculty of Marine Sciences, 2002)
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Abstract:
In the present investigation, an attempt is made to study late Quaternary foraminiferal and pteropod records of the shelf of northern Kerala and to evaluate their potentiality in paleocenographic and paleoclimatic reconstruction. The study gives details of sediment cores, general characteristics of foraminifera and pteropod species recorded from the examined samples and their systematic classification, spatial distribution of Recent foraminifera and pteropods and their response to varying bathymetry, nature of substrate, organic matter content in sediment and hydrography across the shelf. An attempt is also made to establish an integrated chronostratigraphy for the examined core sections. An effort is also made to identify microfaunal criteria useful in biostratigraphic division in shallow marine core sections. An attempt is made to infer various factors responsible for the change in microfaunal assemblage. Reconstruction of sea level changes during the last 36,000 years was attempted based on the pteropod record. The study reveals a bathymetric control on benthic/planktic (BF/PF) foraminiferal and pteropods/planktic foraminiferal (Pt/PF) abundance ratio. Bathymetric distribution pattern of BF/PF ratio is opposite to the (Pt/PF) ratio with decreasing trend of former from the shore across the shelf. Quantitative benthic foraminiferal record in the surficial sediments reveals a positive correlation between the diversity and bathymetry. R-mode cluster analysis performed on 30n significant Recent benthic foraminiferal, determines three major assemblage.
Prasanna, A; Dr. Chandrasekhara, N S(Cochin University of Science and Technology, March 16, 1993)
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Abstract:
Forest is essential for the healthy subsistence of human being on earth. Law has been framed to regulate exploitation of forest.This study is an analysis of the law relating to forest from an environmental perspective.Practical suggestions are also made for the better protection of forest .Forest is a valuable component of human environment.For healthy subsistence of human beings on earth it is essential that at least one third of the land area on earth should be under forest cover. Forest helps in keeping air and water fresh and climate good.The Indian Forest Act 1927 and State legislation relating to forest impose Governmental control over forests by classifying them into reserved forests. Protected forests and village forests.Effective environmental impact studies facilitate adoption of the practice of sustainable development.Permission should not be granted for a project before examination
of its impact on the flora and fauna in forest.Kerala, much of the vested forest remains under the control of the State Government and are managed like reserved forests.Infrastructural facilities require improvement in almost all States for protecting forest.Inter-State problems can be minimised if a central forest legislation is applied uniformly throughout India.Voluntary organisations should be encouraged to taxe part actively in the programmes for conserving forest and wildlife.The new Forest Act should provide for effective environmental impact study before development projects are undertaken in forest areas. The guidelines for this should be clearly laid down in the Act.The law relating to forest should also clearly lay down the guidelines for implementing social forestry programmes. The Forest Department should be authorised to lease lands for planting useful trees. The new forest legislation should also recognise the traditional tribal rights in forest. The Indian Forest Act 1927 and the State legislation relating to forest with their outdated revenue policy and scheme should be replaced by such a new forest legislation framed with an environmental peres-pective. The new law should be uniformly applied throughout India .
Description:
Department of Law, Cochin University of Science and Technology
Boban, Thomas; Dr.Krishna Pillai, M G(Cochin University of Science and Technology, December , 1989)
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Abstract:
This thesis deals with preparing stoichiometric crystalline thin films of InSe and In2Se3 by elemental evapouration and their property investigation.In the present study three temperature( or Elemental evapouration) method is utilized for the deposition of crystalline thin films . The deposition mechanism using three temperature method deals’ with condensation of solids on heated surfaces when the critical supersaturation of the vapour phase exceeds a certain limit. The critical values of the incident flux are related to substrate temperature and the interfacial energies of the involved vapours. At a favorable presence of component atoms in the vapour phase these can react and condense onto a substrate even at a elevated temperature. In the studies conducted the most significant factor is the formation of single compositional film namely indium mono selenide in the In –se system of compounds .Further this work shows the feasibility of thin film photovoltaic junctions of the schottky barrier type
Description:
Department of Physics, Cochin University of Science and Technology
Mohanachandran, K; Dr.Sathianandan, K(Cochin University Of Science And Technology, April 2, 1983)
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Abstract:
Due to the great versatility of the properties
of polymer thin films, special interest has been taken in
recent years on their preparation and electrical properties.
The present thesis is entirely devoted to the study of the
formation, structure and electrical properties of plasma»
polymerised polyacrylonitrile (PAN) thin films. Eventhough
the studies are confined to a single polymer film, the
results in general are applicable to similar polar polymer
films.
Description:
Department of Physics,Cochin University Of Science And Technology
Mohanan, P; Dr.Nair, K G(Cochin University of Science And Technology, March , 1985)
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Abstract:
The flange technique, suggested by Reynolds72
is simple technique to improve antenna characteristics.
Using flange technique we can trim the antenna
characteristic by suitably adjusting the flange parameters75.
Later corrugated flanges87 are used for beam shaping. The
important parameters of the corrugated flanges are (a) flange
angle, (b) flange width, (c) flange position, (d) conductivity
of the flange, (e) amplitude excitation of the flange
elements, (f) period of corrugation etc. Compared to a
compound horn the flange technique offers great convenience
in trimming antenna characteristics.
Horns are commonly used as a feed in radar and
satellite communications. A large number of work had been
done to improve the characteristics of horn antennas. It is
an established fact that grooved walls on the inner surface
of a horn can improve the antenna characteristics44.
Corrugated comb surface can be used for the circular
polarization98, tilt of polarization99 etc. This suggests
the possibility to combine these two phenomena and to
obtain a resultant beam. This thesis presents the result
of an investigation to study the possibility of controlling
different antenna characteristics like polarization, beam
shaping, matching etc, using corrugated flange techniques.
Description:
Department of physics, Cochin University of Science And Technology
Deepa, Sankar; Dr. Tessamma, Thomas(Cochin University of Science and Technology, August , 2011)
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Abstract:
After skin cancer, breast cancer accounts for the second greatest number of cancer diagnoses in women. Currently the etiologies of breast cancer are unknown, and there is no generally accepted therapy for preventing it. Therefore, the best way to improve the prognosis for breast cancer is early detection and treatment. Computer aided detection systems (CAD) for detecting masses or micro-calcifications in mammograms have already been used and proven to be a potentially powerful tool , so the radiologists are attracted by the effectiveness of clinical application of CAD systems. Fractal geometry is well suited for describing the complex physiological structures that defy the traditional Euclidean geometry, which is based on smooth shapes. The major contribution of this research include the development of
• A new fractal feature to accurately classify mammograms into normal and normal (i)With masses (benign or malignant) (ii) with microcalcifications (benign or malignant)
• A novel fast fractal modeling method to identify the presence of microcalcifications by fractal modeling of mammograms and then subtracting the modeled image from the original mammogram.
The performances of these methods were evaluated using different standard statistical analysis methods. The results obtained indicate that the developed methods are highly beneficial for assisting radiologists in making diagnostic decisions. The mammograms for the study were obtained from the two online databases namely, MIAS (Mammographic Image Analysis Society) and DDSM (Digital Database for Screening Mammography.
Description:
Department of Electronics, Cochin University of Science and Technology
Assia,N V; Thrivikraman,T(Department of Mathematics, 2002)
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Abstract:
The study on the fuzzy absolutes and related topics. The different kinds of extensions especially compactification formed a major area of study in topology. Perfect continuous mappings always preserve certain topological properties. The concept of Fuzzy sets introduced by the American Cyberneticist L. A Zadeh started a revolution in every branch of knowledge and in particular in every branch of mathematics. Fuzziness is a kind of uncertainty and uncertainty of a symbol lies in the lack of well-defined boundaries of the set of objects to which this symbol belongs. Introduce an s-continuous mapping from a topological space to a fuzzy topological space and prove that the image of an H-closed space under an s-continuous mapping is f-H closed. Here also proved that the arbitrary product
fi and sum of fi of the s-continuous maps fi are also s-continuous. The original motivation behind the study of absolutes was the problem of characterizing the projective objects in the category of compact spaces and continuous functions.
Sunil,Jacob John; Thrivikraman,T(Department of Mathematics,Faculty of Science, 2000)
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Abstract:
The main purpose of study is to extend the concept of the topological game G(K, X) and some other kinds of games into fuzzy topological games and to obtain some results regarding them. Owing to the fact that topological games have plenty of applications in covering properties, it made an attempt to explore some inter relations of games and covering properties in fuzzy topological spaces. Even though the main focus is on fuzzy para-meta compact spaces and closure preserving shading families, some brief sketches regarding fuzzy P-spaces and Shading Dimension is also provided. In a topological game players choose some objects related to the topological structure of a space such as points, closed subsets, open covers etc. More over the condition on a play to be winning for a player may also include topological notions such as closure, convergence, etc. It turns out that topological games are related to the Baire property, Baire spaces, Completeness properties, Convergence properties, Separation properties, Covering and Base properties, Continuous images, Suslin sets, Singular spaces etc.
Balarama Kaimal,S; Dr. Paulose, C S(Cochin University of Science & Technology, July , 2005)
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Abstract:
The present study demonstrate the functional alterations of the GABAA and GABAB
receptors and the gene expression during the regeneration of pancreas following
partial pancreatectomy. The role of these receptors in insulin secretion and
pancreatic DNA synthesis using the specific agonists and antagonists also are studied
in vitro. The alterations of GABAA and GABAR receptor function and gene
expression in the brain stem, crebellum and hypothalamus play an important role in
the sympathetic regulation of insulin secretion during pancreatic regeneration.
Previous studies have given much information linking functional interaction between
GABA and the peripheral nervous system. The involvement of specific receptor
subtypes functional regulation during pancreatic regeneration has not given emphasis
and research in this area seems to be scarce. We have observed a decreased GABA
content, down regulation of GABAA receptors and an up regulation of GABAB
receptors in the cerebral cortex, brain stem and hypothalamus. Real Time-PCR
analysis confirmed the receptor data in the brain regions. These alterations in the
GABAA and GABAB receptors of the brain are suggested to govern the regenerative
response and growth regulation of the pancreas through sympathetic innervation. In
addition, receptor binding studies and Real Time-PCR analysis revealed that during
pancreatic regeneration GABAA receptors were down regulated and GABAB
receptors were up regulated in pancreatic islets. This suggests an inhibitory role for
GABAA receptors in islet cell proliferation i.e., the down regulation of this receptor
facilitates proliferation. Insulin secretion study during 1 hour showed GABA has
inhibited the insulin secretion in a dose dependent manner in normal and
hyperglycaemic conditions. Bicuculline did not antagonize this effect. GABAA
agonist, muscimol inhibited glucose stimulated insulin secretion from pancreatic
islets except in the lowest concentration of 1O-9M in presence of 4mM glucose.Musclmol enhanced insulin secretion at 10-7 and 10-4M muscimol in presence of
20mM glucose- 4mM glucose represents normal and 20mM represent
hyperglycaemic conditions. GABAB agonist, baclofen also inhibited glucose induced
insulin secretion and enhanced at the concentration of 1O-5M at 4mM glucose and at
10-9M baclofen in presence of 20mM glucose. This shows a differential control of
the GABAA and GABAB receptors over insulin release from the pancreatic islets.
During 24 hours in vitro insulin secretion study it showed that low concentration of
GABA has inhibited glucose stimulated insulin secretion from pancreatic islets.
Muscimol, the GABAA agonist, inhibited the insulin secretion but, gave an enhanced
secretion of insulin in presence of 4mM glucose at 10-7
, 10-5 and 1O-4M muscimol.
But in presence of 20mM glucose muscimol significantly inhibited the insulin
secretion. GABAB agonist, baclofen also inhibited glucose induced insulin secretion
in presence of both 4mM and 20mM glucose. This shows the inhibitory role of
GABA and its specific receptor subtypes over insulin synthesis from pancreatic bete-islets.
In vitro DNA synthesis studies showed that activation of GABAA receptor by
adding muscimol, a specific agonist, inhibited islet DNA synthesis. Also, the
addition of baclofen, a specific agonist of GABAB receptor resulted in the stimulation
of DNA synthesis.Thus the brain and pancreatic GABAA and GABAB receptor
gene expression differentially regulates pancreatic insulin secretion and islet cell
proliferation during pancreatic regeneration. This will have immense clinical
significance in therapeutic applications in the management of Diabetes mellitus.
Description:
Department of Biotechnology,
Cochin University of Science and Technology