Riju, C Issac; Vasudevan Pillai, K; Harilal, S S; Geetha K, Varier; Bindhu, C V; Pramod, Gopinath; Radhakrishnan, P; Nampoori, V P N; Vallabhan, C P G(Elsevier Science, 1998)
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Abstract:
Laser produced plasma from silver is generated using a Q-switched Nd:YAG laser. Optical emission spectroscopy is used
to carry out time of flight (TOF) analysis of atomic particles. An anomalous double peak profile in the TOF distribution is
observed at low pressure. A collection of slower species emerge at reduced pressure below 4 X lO-3 mbar and this species
has a greater velocity spread. At high pressure the plasma expansion follows the shockwave model with cylindrical
symmetry whereas at reduced pressure it shows unsteady adiabatic expansion (UAE). During UAE the species show a
parabolic increases in the expansion time with radial distance whereas during shock wave expansion the exponent is less
than one. The angular distribution of the ablated species in the plume is obtained from the measurement of optical density of
thin films deposited on to glass substrates kept perpendicular to the plume. There is a sharp variation in the film thickness
away from the film centre due to asymmetries in the plume.
Babu, V; Dr.Muraleedharan Nair, S(Cochin University Of Science And Technology, June , 2001)
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Abstract:
The tremendous growth in industrial production and the consequent
improving in the standards of living have provoked worldwide discussion on
environmental quality. The question of abusive use of pesticides for crop protection
and vector control programmes is only one aspect of this entire complex. Inspite of
this, tendentious publications such as Rachel Carson’s Silent spring have brought
crop protection into the foreground of environmental discussions. The persistence
and high stability of organochlorine pesticides are regarded as problematic and the
accumulation of pesticides residues and its metabolites in the different
compartments of the environment is one of the major concerns. Because of their
persistence in the aquatic environment and biomagnifications in food chain, the
continuous use of pesticides will have wider implications not only in aquatic
environmental quality but also on human health. The residual levels of these
persistent chemicals exceed their permissible limits, and get partitioned among the
constituent phases of the aquatic systems. Crop protection is only part of the
agricultural economy and in agriculture itself has led to the most fundamental
changes in the human environment. So, in all areas of life one must weigh the
desired advantages against possible disadvantages.
The proposed thesis is based on the investigations on the distributions of
organochlorine and organophosphorus pesticides in the waters and sediments of
Kuttanad backwaters. Kuttanad, a unique agricultural area, which forms the
southern part of the Vembanad lake, is a deltaic formation of four river systems
entering the southern part of the Cochin estuary. No systematic study has ever been
done to assess the ecotoxicological impact of these diverse chemicals and their
metabolites in Kuttanad area. So, a detailed systematic and rigorous investigation
on the distributions of these persistent chemicals is carried out.
The thesis is divided into 7 Chapters
Description:
Department of Chemical
Oceanography, School of Marine Sciences, Cochin University of Science and
Technology
Sujatha, C H; Dr.Jacob, Chacko(Cochin University of Science and Technology, July , 1992)
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Abstract:
Industrial pollutants, consisting of heavy metals, petroleum residues, petrochemicals, and a wide spectrum of pesticides, enter the marine environment on a massive scale and pose a very serious threat to all forms of aquatic life. Although, earlier, efforts were directed towards the identification of pollutants and their major sources, because of a growing apprehension about the potential harm that pesticides can inflict upon various aquatic fauna and flora, research on fundamental and applied aspects of pesticides in the aquatic environment has mushroomed to a point where it has become difficult to even keep track of the current advances and developments. The Cochin Estuarine System (CES), adjoining the Greater Cochin area, receives considerable amounts of domestic sewage, urban wastes, agricultural runoff as well as effluent from the
industrial units spread all along its shores. Since preliminary investigations revealed that the most prominent of organic pollutants discharged to these estuarine waters were the pesticides, the present study was designed to analyse the temporal and spatial distribution profile of some of the more toxic, persistent pesticides ——— organochlorines such as DDT and their metabolites; HCH-isomers; a cyclodiene compound," Endosulfan and a widely distributed, easily degradable,
organophosphorus compound, Malathion, besides investigating their sorptional and toxicological characteristics.
Although, there were indications of widespread contamination of various regions of the CBS with DDT, HCH-isomers etc., due to inadequacies of the monitoring programmes and due to a glaring void of baseline data the causative factors could not identified authentically. Therefore, seasonal and spatial distributions of some of the more commonly used pesticides in the CES were monitored systematically, (employing Gas Chromatographic techniques) and the results are analysed.
Description:
Chemical
Oceanography Division, School of Marine Sciences, Cochin University
of Science and Technology
Saratchandran, P P; Nandakumaran, V M; Ambika, G(Springer, November , 1996)
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Abstract:
By introducing a periodic perturbation in the control parameter of the logistic map we have investigated the period locking properties of the map. The map then gets locked onto the periodicity of the perturbation for a wide range of values of the parameter and hence can lead to a control of the chaotic regime. This parametrically perturbed map exhibits many other interesting features like the presence of bubble structures, repeated reappearance of periodic cycles beyond the chaotic regime, dependence of the escape parameter on the seed value and also on the initial phase of the perturbation etc.
Thomas, Kuruvilla; Nandakumaran, V M(Indian Academy of Sciences, March , 2000)
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Abstract:
The effect of coupling two chaotic Nd:YAG lasers with intracavity KTP crystal for frequency doubling is numerically studied for the case of the laser operating in three longitudinal modes. It is seen that the system goes from chaotic to periodic and then to steady state as the coupling constant is increased. The intensity time series and phase diagrams are drawn and the Lyapunov characteristic exponent is calculated to characterize the chaotic and periodic regions.
Prathapachandra Kurup, M R; Nisha, K; Sithambaresan, M(November 21, 2011)
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Abstract:
The title compound, C21H19N3O2S, exists in the thione form.
The configuration about the C N bond is E. The
hydrazinecarbothioamide unit adopts an almost planar
arrangement, with maximum deviations of 0.016 (3) and
0.016 (2) A ° for the two thiourea N atoms. An intramolecular
O—H N hydrogen bond occurs. Weak intermolecular N—
H S, C—H O and C—H interactions are observed in
the crystal structure
Adaptive filter is a primary method to filter
Electrocardiogram (ECG), because it does not need the signal
statistical characteristics. In this paper, an adaptive filtering
technique for denoising the ECG based on Genetic Algorithm
(GA) tuned Sign-Data Least Mean Square (SD-LMS) algorithm
is proposed. This technique minimizes the mean-squared error
between the primary input, which is a noisy ECG, and a
reference input which can be either noise that is correlated in
some way with the noise in the primary input or a signal that is
correlated only with ECG in the primary input. Noise is used as
the reference signal in this work. The algorithm was applied to
the records from the MIT -BIH Arrhythmia database for
removing the baseline wander and 60Hz power line interference.
The proposed algorithm gave an average signal to noise ratio
improvement of 10.75 dB for baseline wander and 24.26 dB for
power line interference which is better than the previous
reported works
Description:
2012 IEEE International Conference on Advanced Communication Control and Computing Technologies (ICACCCT)
Verghese, C P; Dr.Shahul,Hameed M(Cochin University of Science and Technology, May , 1994)
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Abstract:
The present scenario of industrial fishing in India is that most of large trawlers are based at Visakhapatnam and congregate in the potential shrimp ground in the
upper East coast of India commonly known as the Sandheads. These are outriggcr vessels operating two or four trawl nets along with a testing trawl called try
net. In the early Seventies these vessels were operating on a very high economic return which was evident from the steady increase in number of outriggers over a period of twenty years. Since the total allowable catch has to be
shared by all vessels including the increasing fleet, reduction per vessel output is bound to happen. Therefore some of them could not survive the competition
and withdrew from the scene. The number of outriggers did not increase subsequently. However, there arose a doubt whether the existing fleet of about 180 vessels are fishing economically or whether there is any scope for further introduction of industrial vessels in the region. This study is focussing to the techno economic aspects of industrial fishing in the upper East coast of India
Description:
Department of Industrial Fisheries,
Cochin University of Science and Technology,
Jyothibabu, R; Dr. Nair, K K C(National Institute of Oceanography, July , 2004)
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Abstract:
In the present study an attempt has been made to understand the microzooplankton community along the easr coast of India. Most of the earlier studies projected Bay of Bengal as an oligotrophic system where phytoplankton growth is limited by a number of factors among which nutrients are the foremost. Hence it is logical to consider that the most of the primary production in the Bay of Bengal could be contributed by small sized phytoplankton harnessing the available resources, which in turn can be utilized effiency by the microzooplankton only. Hence microzooplankton could play in transferring primary organic carbon to higher tropic levels in this region.
Syed, Ismail Koya M S; Dr.Mohandas, A(Cochin University of Science And Technology, December , 1987)
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Abstract:
The great number of parasitic species of marine
and brackishwater animals that have been described indicates
that parasites play an important part in the ecology
of the oceans and brackishwaters. Jnspite of their
importance, marine and brackish parasites are
probably the least known group of organisms. Considering
the large number of marine and brackishwater hosts, especially in the tropics, it is no exaggeration to say
that the description of marine and brackishwater parasites
has hardly begun (Rohde, 1982). With this view in mind,
an attempt has been made to study the ecobiology of the
helminth parasites of finfishes and shellfishes of eochin
waters with special reference to digenetic trematodes.
The work is broadly divided into three chapters,
Chapter 1 consists of a description of the study area,
prevalence of infection and concurrent infections with
helminth parasites, seasonal variation, host specificity>
and zoogeography of digenetic trematodes; Chapter II
deals with the systematics of digenetic trematodes; and
Chapter III deals with studies on larval trematodes from
molluscs and crustacea, adult from a molluscan host,
life-cycle, biology and histopathology
Description:
School of Marine Sciences, Cochin University of Science and Technology
Nowadays there is a growing environmental concern
and the business communities have slowly started recognising
environmental protection and sustainable utilization of natural
resources into their marketing strategies. This paper discusses the
various Ecolabeling and Certification Systems developed world
over to regulate and introduce Fair Trade in Ornamental Fish
Industry. Ecolabeling and green certification are considered as part
of these strategies implemented partly out of compulsion from the
National and International Regulatory Bodies and Environmental
Movements. All the major markets of ornamental fishes like
European Union, USA and Japan have started putting restrictions on
the trade to impose ecolabeling as a non tariff barrier like the one
imposed on seafood and aqua cultured products. A review was done
on the available Ecolabeling and Green Certification Schemes
available at local, national and international levels for fisheries
including aquaculture and ornamental fish trade and to examine the
success and constraints faced by these schemes during its
implementation. The primary downside of certification is the
multiplicity of ecolabels and cost incurred by applicants for
certification, costs which may in turn be passed on to consumers.
The studies reveal serious inadequacies in a number of ecolabels
and cast doubt on their overall contribution to effective fisheries
management and sustainability. The paper also discusses the
inititive taken in India to develop guidelines for Green Certification
of Fresh water ornamental fishes.
Description:
World Academy of Science, Engineering and Technology
Vol:4 2010-05-22
Sincy,Joseph; Saramma, A V(Department of Marine Biology, Microbiology and biochemistry, September , 2005)
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Abstract:
The main objectives of the present investigation were to evaluate the qualitative and quantitative distribution of natural cyanobacterial population and their ecobiological properties along the Cochin estuary and their application in aquaculture systems as a nutritional supplement due to their nutrient-rich biochemical composition and antioxidant potential. This thesis presents a detailed account of the distribution of cyanobacteria in Cochin estuary, an assessment of physico-chemical parameters and the nutrients of the study site, an evaluation of the effect of physico-chemical parameters on cyanobacterial distribution and abundance, isolation, identification and culturing of cyanobacteria, the biochemical composition an productivity of cyanobacteria, and an evaluation of the potential of the selected cyanobacteria as antioxidants against ethanol induced lipid peroxidation. The pH, salinity and nutritional requirements were optimized for low-cost production of the selected cyanobacterial strains. The present study provides an insight into the distribution, abundance, diversity and ecology of cyanobacteria of Cochin estuary. From the results, it is evident that the ecological conditions of Cochin estuary support a rich cyanobacterial growth.
Sheeba, Susan Mathews; Dr.Gopinatha Menon, N(Cochin University of Science and Technology, January , 1992)
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Abstract:
Prawn culture by traditional method forms an important occupation for the people in these areas, especially in the Vypeen island. Though short term studies have been made on various aspects of prawn culture field and its ecology, a study of detailed nature covering perennial, seasonal, fields and canals between coconut plantation is lacking from these areas. This study will also enable to assess the relative productivity of different systems during different seasons and the influence of the environment on the production potentials. Therefore the present study is taken upto throw more light on the ecological characteristics of these fields with special emphasis on its primary, secondary and tertiary production. The present area of investigation includes the prawn culture fields adjacent to Cochin backwater. The Cochin backwater (O9° 58'N 76° 28'E) is a shallow semi-enclosed body of water of tropical estuary. A narrow gut, about 450 M wide forms its main connection with the Arabian sea and this region is subjected to regular tidal influenceertiary production.