Poulose Jacob,K; Dr.Sridhar, C S(Cochin University of Science & Technology, 1991)
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Abstract:
One of the fastest expanding areas of computer exploitation
is in embedded systems, whose prime function is not that of
computing, but which nevertheless require information
processing in order to carry out their prime function.
Advances in hardware technology have made multi
microprocessor systems a viable alternative to uniprocessor
systems in many embedded application areas.
This thesis reports the results of investigations carried out
on multi microprocessors oriented towards embedded
applications, with a view to enhancing throughput and
reliability.
An ideal controller for multiprocessor operation is developed
which would smoothen sharing of routines and enable more
powerful and efficient code I data interchange. Results of
performance evaluation are appended.A typical application scenario is presented, which calls for
classifying tasks based on characteristic features that were
identified. The different classes are introduced along with
a partitioned storage scheme. Theoretical analysis is also
given.
A review of schemes available for reducing disc access time
is carried out and a new scheme presented. This is found to
speed up data base transactions in embedded systems.
The significance of software maintenance and adaptation in
such applications is highlighted. A novel scheme of
prov1d1ng a maintenance folio to system firmware is
presented, alongwith experimental results.
Processing reliability can be enhanced if facility exists to
check if a particular instruction in a stream is appropriate.
Likelihood of occurrence of a particular instruction would be
more prudent if number of instructions in the set is less. A
new organisation is derived to form the basement for further
work. Some early results that would help steer the course of
the work are presented.
Description:
Department of Electronics,Cochin University of Science and Technology
Shoji, Joseph; Dr.Diwan, A D(Cochin University of Science and Technology, May , 1996)
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Abstract:
The growing demand for quality prawn seed from the farmers‘ and entrepreneurs, coupled with uncertainity of their availability from nature at the appropriate time in required quantities has prompted‘ research on problems connected with prawn seed production. Endocrine control of reproduction in the penaeid shrimp _P_. monodon has been investigated in detail by adopting a comprehensive approach to the problem. The major aspects of the study included in depth investigations of the cytological details of the reproductive and neuroendocrine organs in correlation with the process of gonadal maturation. Based on the conclusions drawn from such ultrastructural studies various endocrine manipulations were carried out to see their effects on gonadal maturation. Besides that studies on the reproductive quality of male P_. monodon and the cryopreservation of spermatophores form a part of the present investigation.
The shrimp 3; Inonodon used in the present study were collected from the offshore waters of Cochin, Madras and Mandapam and from the culture ponds of Vypeen Island near Cochin (Kerala) . The entire investigation on the cytological aspects were carried out using standard histological and electron-microscopic methods. Endocrine manipulations and cryopreservation studies is also carried out using the standard methods.
Anju, S. G; Dr. Suguna Yesodharan(Cochin University of Science and Technology, November , 2015)
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Abstract:
The term ‘water pollution’ broadly refers to the contamination of
water and water bodies (e.g. lakes, rivers, oceans, groundwater etc).
Water pollution occurs when pollutants are discharged directly or
indirectly into water bodies without adequate treatment to remove the
harmful contaminants. This affects not only the plants and organisms
living in these bodies of water but also the entire natural biological
communities and the biodiversity.Advanced Oxidation Processes (AOPs) have been tested as
environment-friendly techniques for the treatment of contaminated water,
in view of their ability to convert pollutants into harmless end products.
These techniques refer to a set of treatment procedures designed to
remove organic or inorganic contaminants in wastewater by oxidation.
The contaminants are oxidized by different reagents such as air, oxygen,
ozone, and hydrogen peroxide which are introduced in precise, preprogrammed
dosages, sequences and combinations under appropriate
conditions. The procedure when combined with light in presence of
catalyst is known as photocatalysis. When ultrasound (US) is used as the
energy source, the process is referred as sonication. Sonication in
presence of catalyst is referred as sonocatalysis. Of late, combination of
light and sound as energy sources has been tested for the decontamination
of wastewater in the presence of suitable catalyst. In this case, the process
is referred as sonophotocatalysis. These AOPs are specially advantageous
in pollution control and waste water treatment because unlike many other
technologies, they do not just transfer the pollutant from one phase to another but completely degrade them into innocuous substances such as
CO2 and H2O.
Janat Augustine, K; Dr.Chandramohanakumar, N(Cochin University of Science & Technology, September , 2002)
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Abstract:
Humic substances are complex polymeric structures.No other polymers with such a wide range of properties are so widely distributed in nature.But still their moleculer structures are unknown. A structural knowledge is essential in determining their reactivity with metals.In the present work structural elucidation of humic acids from three different mangrove ecosystems of Cochin area is done with the available data from functional group analysis and various spectroscopic methods.13C NMR spectra of the solid samples with CPMAS,IR and SEM are very promising in revealing the complex structures of these polymeric substances.Sorptional studies on the sediment and humic acid of mangrove ecosystem reveals that the major portion of the organic matter is not extractable with Sodium hydroxide and humic acid only a small portion of the total organic matter. Humic acid is a good complexing agent and scavenger. Due to the nonextractable nature of the organic matter present with the sediment left after alkali extraction it is a better scavenger.
Description:
Department of Chemical Oceanography,Cochin University of Science and Technology
Gireesh Kumar, T R; Dr.Chandramohanakumar, N(Cochin University Of Science And Technology, February , 2013)
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Abstract:
The source, fate and diagentic pathway of sedimentary organic matter in
estuaries are difficult to delineate due to the complexity of organic matter
sources, intensive physical mixing and biological processes. A combination of
bulk organic matter techniques and molecular biomarkers are found to be
successful in explaining organic matter dynamics in estuaries. The basic
requirement for these multi-proxy approaches are (i) sources have significantly
differing characteristics, (ii) there are a sufficient number of tracers to delineate
all sources and (iii) organic matter degradation and processing have little,
similar or predictable effects on end member characteristics.
Although there have been abundant researches that have attempted to
tackle difficulties related to the source and fate of organic matter in
estuarine systems, our understanding remains limited or rather inconsistent
regarding the Indian estuaries. Cochin estuary is the largest among many
extensive estuarine systems along the southwest coast of India. It supports
as much biological productivity and diversity as tropical rain forests. In this
study, we have used a combination of bulk geochemical parameters and
different group of molecular biomarkers to define organic matter sources
and thereby identifying various biogeochemical processes acting along the
salinity gradient of the Cochin estuary
Description:
Department of Chemical Oceanography
School of Marine Sciences
Cochin University of Science and Technology
Nithin, Viswambharan; Dr.Mohan Kumar, K(Cochin University of Science and Technology, April 23, 2012)
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Abstract:
This thesis entitled southern hemispheric features and their Teleconnection with indian summer monsoon.Southern hemisphere is entirely distinct from the northern hemisphere in many aspects, which is well reflected in atmospheric and oceanic properties.The thesis consists of eight chapters, in which the first chapter contains an overview of southern hemisphere. In this chapter, variability in southern hemisphere is described along with Indian summer monsoon and its teleconnection. The different types of data sets used and various methodologies adopted in the present thesis were described in Chapter 2. The period of climate shift and the magnitude of anomalies after the climate shift, which extended from troposphere to stratopause level, were investigated in detail and presented in chapter 3.
Chapter 4 depicts the recent trend and variability in southern stratosphere. The higher order variability during various months and the frequency of extremity is included in this chapter.Climatology of divergence and convergence after the documented shift is reported in chapter 5.Southern extratropical connection to Indian summer monsoon through the modulation of SAM is presented in Chapter 6.Chapter 7 deals with the modulation of SAM‐Monsoon link through North Atlantic Oscillation.
Description:
Department of Atmospheric Sciences
Cochin University of Science and Technology
Aype,Thomas P; Rajan,C K(Department of atmospheric sciences, 2005)
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Abstract:
This study focuses on the south –west monsoon rainfall over Kerala and its variability both on the spatial and temporal scales. The main objectives of the study are, interanual, long-term and decadal variabilities in MRF(monsoon rain fall),relationship between antecedent global circulation parameters, diurnal variability using data of a large number of stations in Kerala and the spatial distribution of rainfall under two large scale synoptic. Kerala gets nearly 190cm of rainfall during the south-west monsoon season 1st June to 30th September. This is more than twice the monsoon rainfall of India. A good part of kerala’s rainfall is caused by the orography of the Western Ghats Mountain ranges. The state receives 286cm of annual rainfall of which 68%is during the south-west monsoon season. The summer monsoon rainfall of Kerala shows a decreasing trend of 12.0%in 96 years. The study shows that the Intra Seasonal Oscillations(ISO) of the monsoon season has large interanual variability,some years having long period and other years having short period ISO. It is seen that Western Ghats has a strong control on the east west profile on the monsoon rainfall.
Nimmi,R Nair; Dr.Basil, Mathew; Dr.Mohan Kumar, K(Naval Physical and Oceanographic Laboratory, January , 2004)
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Abstract:
The objective of the present study is to understand the spatial and temporal variability of sea surface temperature(SST), precipitable water, zonal and meridional components of wind stress over the tropical Indian Ocean to understand the different scales of variability of these features of Indian Ocean. Empirical Orthogonal Function (EOF) and wavelet analysis techniques are utilized to understand the standing oscillations and multi scale oscillations respectively. The study has been carried out over Indian Ocean and South Indian Ocean. For the present study, NCEP/NCAR(National Center for Environmental Prediction National Center for Atmospheric Research) reanalyzed daily fields of sea surface temperature, zonal and meridional surface wind components and precipitable water amount during 1960-1998 are used. The principle of EOF analysis and
the methodology used for the analysis of spatial and temporal variance modes.
Neetha, Joseph; Dr. Shanta, Achuthankutty(Cochin University of Science and Technology, June , 2012)
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Abstract:
This thesis entitled spatial and temporal variarion of microbial community structure in surficial sediments of cochin estuary.In the estuarine and coastal systems, organic matter (OM) is derived not only from autochthonous primary production, but also from allochthonous (terrestrial) organic matter (OM) delivered by river discharge and runoff. A significant portion of the OM sinks through the water column and is ultimately stored in carbon pool in the sediments.Analysis of spatial and temporal variation in benthic microbial community of a tropical estuary was conducted for the first time using non selective measures that affirms that PLFA approach is a sensitive and reliable method in determining microbial community structures of surficial sediments of estuary.The close relationship between the concentrations of the microbial fatty acids and total biomass indicates that bacteria could account for the largest proportion of the biomass in the sediments.This is first study that has documented the changes in microbial community composition linkage to biotic and abiotic variables in benthic estuarine ecosystem. This contemporaneous community will be the backdrop for understanding the response of autochthonous community to increasing anthropogenic stress.
Description:
Department of Marine Microbiology,National Institute of Oceanography
Haridevi, C K; Dr.Revichandran,C(Cochin University Of Science And Technology, May , 2013)
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Abstract:
The influence of salinity on phytoplankton varies widely, because
different species have different salinity preferences. Like marine and
aquatic species, many phytoplankton species exhibit tolerance to certain
salinity, beyond which, it can inhibit their growth. Light is the most
important factor that influences phytoplankton growth. In aquatic
environments (lakes, sea or estuary) the light incident on the surface is rapidly reduced exponentially with depth (Krik, 1994). In estuaries, the
major factor influencing the light availability is the suspended particulate
matter, which attenuates and scatters the light. The light changes with time
of the day and the season, affecting the amount of light penetrating the
water column. Similarly, biological factor like copepod grazing is a major
factor influencing the standing crop of phytoplankton. The copepod can
actively graze up to 75% of the phytoplankton biomass in a tropical
estuary (Tan et. al., 2004). It is in the context that the present study
investigates the salinity, light (physical factors) and copepod grazing
(biological factor) phytoplankton as the factors controlling phytoplankton
growth and distribution
Description:
National Institute of
Oceanography, Regional Centre, Kochi
Sethunadh, R; Dr. Tessamma, Thomas(Cochin University of Science and Technology, August 18, 2014)
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Abstract:
The aim of the thesis was to design and develop
spatially adaptive denoising techniques with edge and feature preservation, for
images corrupted with additive white Gaussian noise and SAR images affected
with speckle noise. Image denoising is a well researched topic. It has found multifaceted applications
in our day to day life. Image denoising based on multi resolution analysis using
wavelet transform has received considerable attention in recent years.
The directionlet based denoising schemes presented in this thesis are effective in
preserving the image specific features like edges and contours in denoising. Scope
of this research is still open in areas like further optimization in terms of speed and
extension of the techniques to other related areas like colour and video image
denoising. Such studies would further augment the practical use of these
techniques.
Dipson, P T; Dr.Harindranathan Nair, M V(Cochin University Of Science And Technology, November , 2012)
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Abstract:
Urban developments have exerted immense pressure on wetlands.
Urban areas are normally centers of commercial activity and continue to attract
migrants in large numbers in search of employment from different areas. As a
result, habitations keep coming up in the natural areas / flood plains. This is
happening in various Indian cities and towns and large habitations are coming
up in low-lying areas, often encroaching even over drainage channels. In
some cases, houses are constructed even on top of nallahs and drains.
In the case of Kochi the situation is even worse as the base of the
urban development itself stands on a completely reclaimed island. Also the
topography and geology demanded more reclamation of land when the city
developed as an agglomerative cluster. Cochin is a coastal settlement
interspersed with a large backwater system and fringed on the eastern side by
laterite-capped low hills from which a number of streams drain into the
backwater system. The ridge line of the eastern low hills provides a welldefined
watershed delimiting Cochin basin which help to confine the
environmental parameters within a physical limit. This leads to an obvious
conclusion that if physiography alone is considered, the western flatland is
ideal for urban development. However it will result in serious environmental
deterioration, as it comprises mainly of wetland and for availability of land there
has to be large scale filling up of these wetlands which includes shallow
mangrove-fringed water sheets, paddy fields, Pokkali fields, estuary etc.Chapter 1
School 4 of Environmental Studies
The urban boundaries of Cochin are expanding fast with a consequent
over-stretching of the existing fabric of basic amenities and services.
Urbanisation leads to the transformation of agricultural land into built-up areas
with the concomitant problems regarding water supply, drainage, garbage and
sewage disposal etc. Many of the environmental problems of Cochin are
hydrologic in origin; like water-logging / floods, sedimentation and pollution in
the water bodies as well as shoreline erosion
Description:
School of Environmental Studies
Cochin University of Science and Technology