Bijoy, Nandan S; Jayachandran, P R; Sreedevi, O K(2012)
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Abstract:
The status of fisheries and seasonal variation in fish diversity in the Kodungallur-Azhikode Estuary (KAE) were investigated.
Total annual average fish production in the estuary declined significantly to 908.6 t with average yield of 5.4 kg ha-1 day-1,
when compared to earlier study; where 2747 t was reported. During the present study, 60 species of finfishes (belonging to
34 finfish families), 6 species of penaeid shrimps, 2 species of palaemonid prawns, 2 species of crabs (4 crustacean families),
6 species of bivalves and 2 species of edible oysters (3 molluscan families) were noticed. Finfishes were the major group that
contributed 69.62% of total fishery in the estuary and crustaceans (23.47%), bivalves (6.84%) and oysters (0.07%) also
formed good fishery. Many of the fish species in the estuary were observed as threatened (Horabagrus brachysoma, Channa
striatus, Channa marulius, Clarias batrachus, Heteropneustes fossilis and Wallago attu). The major fishing gears employed
in the estuary were gillnets, cast nets, stake nets, scoop nets, ring nets, traps and Chinese dip nets. Gillnets contributed 45%
of the total fish catch. Gillnets also showed highest catch per unit effort (CPUE) of 6.91 kg h -1 followed by cast nets
(1.85 kg h -1), Chinese dip nets (3.20 kg h -1), stake nets (3.05 kg h -1), ring nets (1.27 kg h -1), hooks and lines (1.35 kg h -1)
and scoop nets (0.92 kg h -1). The study implies that temporal changes in fish landing pattern of the KAE was mainly due to
environmental variability, habitat modification and fish migration; under the influence of south-west monsoon and
anthropogenic activities in the KAE. Results of the study suggest that spatio-temporal variations in the fish community
structure could be an indicator for anthropogenic stress and it should be considered for restoration programmes.
Paulose,C S; Thliveris,J A; Dakshinamurti,K; Viswanathan,M(Department of Biotechnology, 1989)
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Abstract:
We have studied testicular function in the biotin-
deficient rat biochemically and morphologically.
Serum testosterone and luteinizing hormone (LH) levels
were decreased significantly in the deficient rats. Administration
of biotin or gonadotropins to the deficient rats
reversed this decrease in serum testosterone. There was no
difference in the serum cholesterol level between the control
and biotin-deficient rats. A significant degree of sloughing
of seminiferous tubule germinal epithelium was noticed
in the biotin-deficient rat testes. Biotin treatment of biotindeficient
rats reversed this condition whereas testosterone
treatment was without any effect. The development and
maintenance of morphological and functional integrity of
the seminiferous tubules appears to require a biotin-mediated
step in addition to testosterone.
One comes across directions as the observations in a number of situations. The first inferential question that one should answer when dealing with such data is, “Are they isotropic or uniformly distributed?” The answer to this question goes back in history which we shall retrace a bit and provide an exact and approximate solution to this so-called “Pearson’s Random Walk” problem.
Ramachandran,K K; Dr.Seralathan, P(cusat, April 10, 1992)
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Abstract:
The continental shelf of southwest coast of India (Kerala) is broader and . flatter compared to that of the east coast. The unique characteristic feature of the study area (innershelf between Narakkal and Purakkad) is the intermittent appearance of 'mud banks' at certain locations during southwest monsoon. The strong seasonality manifests significant changes in the wind, waves, currents, rainfall, drainage etc., along this area. Peculiar geomorphological variation with high, mid and lowlands in the narrow strip of the hinterland, the geological formations mainly consisting of rocks of metamorphic origin and the humid tropical weathering conditions play significant role in regulating the shelf sedimentation.
A complementary pattern of distri bution is observed for clay that shows an abundance in the nearshore. Silt, to a major extent, depicts semblance with clay distribution . Summation of the total asymmetry of grain size distribution are inferred from the variation of skewness and kurtosis.Factor I implies a low energy regime where the transportation and deposition phases are controlled mostly by pelagic suspension process as the factor loadings are dominant on finer phi sizes. The second Factor is inferred to be the result of a high energy regime which gives higher loadings on coarser size fractions. The third Factor which might be a transition phase (medium energy regime) representing the resultant flux of coastal circulation of the re-suspension/deposition and an onshoreoffshore advection by reworking and co-deposition of relict and modern sediments. The spatial variations of the energy regime based on the three end-member factor model exhibits high energy zone in the seaward portion transcending to a low energy one towards the coast.From the combined analysis of granulometry and SEM studies, it is concluded that the sandy patches beyond 20 m depth are of relict nature. They are the resultant responses of beach activity during the lower stand of sea level in the Holocene. Re-crystallisation features on the quartz grains indicate that they were exposed to subaerial weathering process subsequent to thei r deposition
Description:
Marine Science Division, Centre for Earth Science Studies,
Thiruvananthapuram
Tessamma, Thomas; Ananda Resmi, S(ACEEE, November , 2010)
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Abstract:
Low grade and High grade Gliomas are tumors
that originate in the glial cells. The main challenge in brain
tumor diagnosis is whether a tumor is benign or malignant,
primary or metastatic and low or high grade. Based on the
patient's MRI, a radiologist could not differentiate whether it
is a low grade Glioma or a high grade Glioma. Because both
of these are almost visually similar, autopsy confirms the
diagnosis of low grade with high-grade and infiltrative
features. In this paper, textural description of Grade I and
grade III Glioma are extracted using First order statistics and
Gray Level Co-occurance Matrix Method (GLCM). Textural
features are extracted from 16X16 sub image of the
segmented Region of Interest(ROI) .In the proposed method,
first order statistical features such as contrast, Intensity ,
Entropy, Kurtosis and spectral energy and GLCM features
extracted were showed promising results. The ranges of these
first order statistics and GLCM based features extracted are
highly discriminant between grade I and Grade III. In this
study which gives statistical textural information of grade I
and grade III Glioma which is very useful for further
classification and analysis and thus assisting Radiologist in
greater extent.
Description:
Int. J. of Recent Trends in Engineering and Technology, Vol. 4, No. 3, Nov 2010
Rajan,R V; Seralathan,P(COCHIN UNIVERSITY OF SCIENCE AND TECHNOLOGY, November , 2006)
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Abstract:
The present study addresses to understand the sedimentological properties of the coasts of kodungallur and chellanam, central Kerala to bring out the relationship between the textural, mineralogical and geochemical characters with that of the respective environment. The grain size study of the beach ridge sediments from different pits has been investigated at close intervals, which enables to understand the grain size variations with depth. The sediment samples from various pits of the beach ridges indicate that the sediments range primarily from medium to very fine sand, well to moderately sorted, fine to coarse skewed and leptokurtic to platykurtic. The study area is considered as a prograding coast. Variations in grain size down the pit give three phases of beach building activities i.e.; a coarsening upward sequence in the bottom layers, a fining upward in the middle and coarsening upward in the top. Beach ridges are formed by swash built sediments with cross bedding and setting lag type sediments with seaward dipping/horizontal units.
Geochemical signatures in the study area have been brought out through the analysis of major and trace elements. Iron is significantly enriched and its control over many trace elements is evident. Copper, chromium, cobalt, lithium, lead and zinc show decreasing trend with depth, while sodium, potassium,strontium,nickel and organic carbon increases. The association of many trace elements with organic carbon has also been established. Dissolution of trace elements in anoxic environment, at depth and reprecipitation in the oxic layers, at near or subsurface, are the major mechanism that brought out the variation of certain environmentally sensitive elements
Jiby, K. Gopinath; Dr. K. Sreekumar(Cochin University of Science & Technology, July 30, 2015)
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Abstract:
Polymers with conjugated π-electron backbone display unusual
electronic properties such as low energy optical transition, low ionization
potentials, and high electron affinities. The properties that make these
materials attractive include a wide range of electrical conductivity,
mechanical flexibility and thermal stability. Some of the potential
applications of these conjugated polymers are in sensors, solar cells, field
effect transistors, field emission and electrochromic displays, supercapacitors
and energy storage. With recent advances in the stability of
conjugated polymer materials, and improved control of properties, a
growing number of applications are currently being explored. Some of the
important applications of conducting polymers include: they are used in
electrostatic materials, conducting adhesives, shielding against
electromagnetic interference (EMI), artificial nerves, aircraft structures,
diodes, and transistors.
Analytical expressions for the Green’s function of an annular elliptical ring microstrip
antenna (AERMA) are developed and reported. The modal, radiation and input impedance
characteristics of the TM, modes are determined from these expressions. The resonant frequencies of
odd modes are greater than that of the even modes for all TMnl modes (n = 1, 2, 3, ...) udke
elliptical microstrip structures. The radiation pattern and input imedance curves of TMI2 mode on
comparison with available experimental result shows good agreement whch provides an independent
validation to this technique. The performance of the AERMA is then investigated as a function of
thickness and substrate dielectric permittivity.
Description:
IEE Proc.-Microw. Antennas Propag., Vol. 146, No. 6, December 1999
Bejoy, Varghese; Dr. Nandakumar, V.M(Cochin University of Science and Technology, December 13, 2015)
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Abstract:
Semiconductor lasers with different types of feedback schemes have been an active research
area for many years. Feedback can induce complex phenomena in semiconductor
lasers and their investigations often helped to understand the inner mechanisms of the
laser. The possibility of using high dimensional chaos induced in semiconductor lasers
by delayed feedback, for secure communication systems was a major motivation for intense
research in the subject. Recently these systems also served as a testbed for general
investigations on delay dynamical systems. The present study focuses on the aspects of the
dynamical behavior of semiconductor lasers which are induced by delay feedback.
Santhosh,K R; Dr.Viswanadham,D V(Cochin University of Science and Technology, March , 1987)
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Abstract:
Man's inadvertent interference with the
environment by way of indiscreL¢ industrflflization
has led to the deteriorating air quality in the recent
times. The search is on to find the remedies to
confine the air pollution levels with in their thershold
limits. Theoretical studies play A crucial role in the
control and for abatment of air pollution. Improper
siting of industry is one of the most common reasons
for the increased levels of air pollution in urban
environments. A proper and effective ecological planning
is an essential first step for any region in order to
reduce the effects of air pollution. By means of
theoretical models one can obtain the pollutant distribution
in any urban area, provided the necessary data
are available with the help of which the sites for new
industries could be suggested, given the emission
inventory. Studies on air pollution meteorology serve
and aid the planners to initate remedial actions to
bring down the levels of pollution and also to out—line
the control strategy. In the present thesis some
theoretical studies on air pollution meteorology over
South India are made. The thesis is divided into
six chapters
Description:
Physical Oceanography and Meteorology Division
School of Marine Sciences, Cochin University of Science And Technology
Rosabella,K Puthur; Sebastian, K L; Sugunan, S(Cochin University of Science and Technology, October , 2001)
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Abstract:
The thesis presents the dynamics of a polymer chain under tension. It includes existing theories of polymer fracture, important theories of reaction rates, the rate using multidimensional transition state theory and apply it to the case of polyethylene etc. The main findings of the study are; the life time of the bond is somewhat sensitive to the potential lead to rather different answers, for a given potential a rough estimate of the rate can be obtained by a simples approximation that considers the dynamics of only the bond that breaks and neglects the coupling to neighboring bonds. Dynamics of neighboring bonds would decrease the rate, but usually not more than by one order of magnitude, for the breaking of polyethylene, quantum effects are important only for temperatures below 150K, the lifetime strongly depends on the strain and as the strain varies over a narrow range, the life varies rapidly from 105 seconds to 10_5 seconds, if we change one unit of the polymer by a foreign atom, say by one sulphure atom, in the main chain itself, by a weaker bond, the rate is found to increase by orders of magnitude etc.