Nirmala, Antherjanam N; Dr.Jathavedan, M(Cochin University of Science And Technology, December , 1987)
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Abstract:
In this thesis the author has presented qualitative studies of certain Kdv equations with variable coefficients. The well-known KdV equation is a model for waves propagating on the surface of shallow water of constant depth. This model is considered as fitting into waves reaching the shore. Renewed attempts have led to the derivation of KdV type equations in which the coefficients are not constants. Johnson's equation is one such equation. The researcher has used this model to study the interaction of waves. It has been found that three-wave interaction is possible, there is transfer of energy between the waves and the energy is not conserved during interaction.
Description:
Department of mathematics, Cochin University of Science And Technology
Hari Sankar, B; Dr Ramaiah(Cochin University of Science and Technology, January 8, 2015)
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Abstract:
Development of molecular probes for the selective and sensitive detection of
analytes has been an active area of research because such effective molecules can have
biological and medicinal applications. Of the various probes reported, the fluorescence
based systems have attracted much attention owing to their high sensitivity, fast
response time, non–invasiveness and technical simplicity. However, the quantification of
a target analyte using the fluorescent probe that acts through a single emission response
(either increase or decrease in the fluorescence intensity) can have disadvantages, when
compared to the systems that show either dual emission or ratiometric changes. In the
case of the systems that exhibit ratiometric changes, the ratio of the fluorescence
intensity of the two different wavelengths can be utilized for the quantification of the
analyte of interest. Such an observation will have an effective internal referencing that
greatly increases the sensitivity of the detection. In this context, it was our objective to
develop functional organic systems and to explore their potential as sensitive
fluorescent probes for the recognition of anions, cations and biomolecules. The present
thesis has been divided into four chapters and of which the first chapter gives an
overview on the organic fluorescent probes, with a particular emphasis on their
mechanism of molecular recognition. In addition, the specific objectives of the present
thesis were also briefly described at the end of this chapter.
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.