Prajith, K K; Dr.Madhusoodana,Kurup B(Cochin University of Science and Technology, December , 2011)
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Abstract:
This thesis Entitled Application of Biofloc technology (BFT) In the Nursery Rearing and Farming of
Giant Freshwater Prawn,Macrobrachium Rosenbergii(De Man). Aquaculture, rearing plants and animals under controlled conditions is growing with an annual growth rate of 8.3% in the period 1970-2008 (FAO, 2010). This trend of growth is essential for the supply of protein-rich food for ever increasing world population. But growth and development of aquaculture should be in sustainable manner, preferably without jeopardizing the aquatic environment.In the present study, the application of BFT in the nursery rearing and farming ofgiant freshwater prawn, M. rosenbergii, is attempted. The result of the study is organised into eight chapters. In the first chapter, the subject is adequately introduced. Various types of aquaculture practices followed, development and status of Indian aquaculture, present status of freshwater pravm culture, BF T and its use for the sustainable aquaculture systems, theory of BFT based aquaculture practices, hypothesis, objective and outline of the thesis are described. An extensive review of literature on studies carried out so far on biofloc based aquaculture are given in chapter 2. The third chapter deals with the application of BFT in the primary nursery phase of freshwater prawn. Several workers suggested the need for an intermediate nursery phase in the culture system of freshwater prawn for the successful production. Thirty day experiment was conducted to study the effect of BFT on the water quality, and animal welfare under the various stocking densities.
The study concluded that stocking finfishes in biofloc-based monoculture system of freshwater prawns has the potential of increasing total yield. Prawns having a higher commercial value than finfishes besides ensuring economic sustainability. Results showed that prawn yield and survival was better in catla dominated tanks. Based on the results of the study, it is recommended to incorporate 25% rohu and 75% catla in the biofloc-based culture system of giant freshwater prawns. The results of the
present study also recommend to stock relatively larger catla for biofloc-based culture system. Fish production was also higher in the 100% catla tank. When catla was added in higher percentages it should ensured that the hiding objects in the culture ponds shall be used in order to reduce the chance of cannibalism among prawns. rohu and catla equally have the ability to harvest the biofloc, catla consumes the planktonic contributes in the floc whereas rohu grazed on the bacterial consortium suspended in the water column. In Chapter 8, recommendations and future research perspectives in
the field of biofloc based aquaculture is presented.
Description:
School of Industrial Fisheries, Cochin University of Science and Technology
Nair, K G; Vasudevan, K; Mohanan, P; Aanandan, C.K(CUSAT, December 17, 2014)
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Description:
14th Biennial International Symposium on Antennas and propagation Department of Electronics, Cochin University of Science & Technology, Cochin 682022, INDIA
Newby, Joseph; Dr.Saramma, A V(Cochin University of Science and Technology, December 28, 2002)
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Abstract:
Aquatic ecosystem in the south west coast of India is noted for its diversity of
habitats. Very often these environments turn bluegreen when the bloom of
bluegreen algae (cyanobacteria) appear consequent to eutrophication. This
phenomenon occursin these habitats one after the other or simultaneously. This
conspicuousness make one curious enough to know more about these nature’s gift
bestowed upon mankind. While persuing the literature on the magnificent flora) it
is understood that it may provide food fertilizer, chemicals and bioactive
substances. These bioactive substances are likely to be involved in regulating
natural populations and are potentially useful as biochemical tools and as
herbicidal or biocontrol agents. The role of cyanobacteria in the aquatic food
chain and contribution in abatement of heavy metals from the natural
environment are well documented. Considering the manifold utilization of the flora and their significance in the food chain, the present investigation has been undertaken
Description:
Department of Marine
Biology, Microbiology and Biochemistry, School of Marine Sciences, Cochin University of Science and Technology
Baiju, K V; Dr. K G K Warrier(National Institute for Interdisciplinary Science and Technology,CSIR, November , 2007)
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Abstract:
The present thesis develops from the point of view of titania sol-gel chemistry and an attempt is made to address the modification of the process for better photoactive titania
by selective doping and also demonstration of utilization of the process for the
preparation of supported membranes and self cleaning films.A general introduction to nanomaterials, nanocrystalline titania and sol-gel
chemistry are presented in the first chapter. A brief and updated literature review on
sol-gel titania, with special emphasis on catalytic and photocatalytic properties and
anatase to rutile transformation are covered. Based on critical assessment of the reported
information the present research problem has been defined.The second chapter describes a new aqueous sol-gel method for the preparation
of nanocrystalline titania using titanyl sulphate as precursor. This approach is novel
since no earlier work has been reported in the same lines proposed here. The sol-gel
process has been followed at each step using particle size, zeta potential measurements
on the sol and thermal analysis of the resultant gel. The prepared powders were then
characterized using X-ray diffraction, FTIR, BET surface area analysis and transmission
electron microscopy.The third chapter presents a detailed discussion on the physico-chemical
characterization of the aqueous sol-gel derived doped titania. The effect of dopants such
as tantalum, gadolinium and ytterbium on the anatase to rutile phase transformation,
surface area as well as their influence on photoactivity is also included.
The fourth chapter demonstrates application of the aqueous sol-gel method in
developing titania coatings on porous alumina substrates for controlling the poresize for
use as membrane elements in ultrafiltration. Thin coatings having ~50 nm thickness and
transparency of ~90% developed on glass surface were tested successfully for self
cleaning applications.
Shaji, P N; Dr.George, Varghese K(Cochin University of Science And Technology, November 5, 2012)
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Abstract:
A study focusing on the identification of return generating factors and to
the extent of their influence on share prices the outcome will be a tool for
investment analysis in the hands of investors portfolio managers and mutual
funds who are mostly concerned with changing share prices. Since the study
takes into account the influence of macroeconomic variables on variations in
share returns by using the outcome the government can frame out suitable
policies on long term basis and that will help in nurturing a healthy economy
and resultant stock market. As every company management tries to maximize
the wealth of the share holders a clear idea about the return generating
variables and their influence will help the management to frame various
policies to maximize the wealth of the shareholders.
Description:
School of Management Studies
Cochin University of Science and Technology
Sheeja, N K; Surendran, Cherukodan(Indira Gandhi National Centre For The Arts,New Delhi, August 21, 2010)
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Abstract:
Newspapers cover a large amount of information everyday on topics of varied
interests. To a university, newspapers are essential components of
communication as they cover various happenings in a university. These items of
information are neither stored properly nor put in retrieval systems for future
use. The news and views appeared in newspapers can effectively be organized in
a digital library making use of open source software. The CUSAT digital library
(http://dspace.cusat.ac.in/dspace/) has organized some news items that
appeared in local newspapers about the university under a special community
named “CUSAT-News”. This article describes the methods of collecting,
selecting, organizing, providing access and preserving news items required by a
university using DSpace open source software.
Description:
IFLA international newspaper conference,2010,25-28 february
This paper attempts to develop an improved tool,
which would read two dimensional(2D) cardiac MRI images and
compute areas and volume of the scar tissue. Here the
computation would be done on the cardiac MR images to
quantify the extent of damage inflicted by myocardial infarction
on the cardiac muscle (myocardium) using Interpolation
Jessy,John C; Dr.Pillai, R N(Cochin University of Science And Technology, 1985)
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Abstract:
This study is concerned with Autoregressive Moving Average (ARMA) models of time series. ARMA models form a subclass of the class of general linear models which represents stationary time series, a phenomenon encountered most often in practice by engineers, scientists and economists. It is always desirable to employ models which use parameters parsimoniously. Parsimony will be achieved by ARMA models because it has only finite number of parameters. Even though the discussion is primarily concerned with stationary time series, later we will take
up the case of homogeneous non stationary time series which can be transformed to stationary time series. Time series models, obtained with the help of the present and past data is used for forecasting future values. Physical science as well as social science take benefits of forecasting models. The role of forecasting cuts across all fields of management-—finance, marketing, production, business economics, as also in signal process, communication engineering, chemical processes, electronics etc. This high applicability of time series is the motivation to this study.
Description:
Department of mathematics, Cochin University of Science And Technology
Tennant,A; Dawoud,M M; Anderson,A P(Department of Electronics, April 27, 1994)
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Abstract:
A genetic algorithm has been used for null steering in phased and
adaptive arrays . It has been shown that it is possible to steer the
array null s precisely to the required interference directions and to
achieve any prescribed null depths . A comparison with the results
obtained from the analytic solution shows the advantages of using
the genetic algorithm for null steering in linear array patterns
Ravindranathan, S; Dr.Unnikrishnan, A(Cochin University of Science & Technology, October , 1991)
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Abstract:
Neural Network has emerged as the topic of the day.
The spectrum of its application is as wide as from ECG noise
filtering to seismic data analysis and from elementary
particle detection to electronic music composition. The
focal point of the proposed work is an application of a
massively parallel connectionist model network for detection
of a sonar target. This task is segmented into: (i) generation of training patterns from sea noise that
contains radiated noise of a target, for teaching the
network;(ii) selection of suitable network topology and learning
algorithm and (iii) training of the network and its subsequent testing
where the network detects, in unknown patterns applied
to it, the presence of the features it has already
learned in. A three-layer perceptron using backpropagation
learning is initially subjected to a recursive training
with example patterns (derived from sea ambient noise with
and without the radiated noise of a target). On every
presentation, the error in the output of the network is
propagated back and the weights and the bias associated with
each neuron in the network are modified in proportion to
this error measure. During this iterative process, the network converges and extracts the target features which get
encoded into its generalized weights and biases.In every unknown pattern that the converged
network subsequently confronts with, it searches for the
features already learned and outputs an indication for their
presence or absence. This capability for target detection is
exhibited by the response of the network to various test
patterns presented to it.Three network topologies are tried with two
variants of backpropagation learning and a grading of the
performance of each combination is subsequently made.
Description:
Department of Electronics, Cochin University of Science and Technology
Chandrasekaran, M; Devarasiddappa, D(June 1, 2014)
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Abstract:
Metal matrix composites (MMC) having aluminium (Al) in the matrix phase and silicon
carbide particles (SiCp) in reinforcement phase, ie Al‐SiCp type MMC, have gained
popularity in the re‐cent past. In this competitive age, manufacturing industries strive to
produce superior quality products at reasonable price. This is possible by achieving higher
productivity while performing machining at optimum combinations of process variables. The
low weight and high strength MMC are found suitable for variety of components
Description:
Advances in production engineering and management,vol 9 no 2,pp 59-70
Dr.Babu, C A; Jayakrishnan, P R(http://www.scirp.org/journal/acs, 2014)
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Abstract:
The combined use of both radiosonde data and three-dimensional satellite derived data over ocean and land is useful for a better understanding of atmospheric thermodynamics. Here, an attempt is made to study the ther-modynamic structure of convective atmosphere during pre-monsoon season over southwest peninsular India utilizing satellite derived data and radiosonde data. The stability indices were computed for the selected stations over southwest peninsular India viz: Thiruvananthapuram and Cochin, using the radiosonde data for five pre- monsoon seasons. The stability indices studied for the region are Showalter Index (SI), K Index (KI), Lifted In-dex (LI), Total Totals Index (TTI), Humidity Index (HI), Deep Convective Index (DCI) and thermodynamic pa-rameters such as Convective Available Potential Energy (CAPE) and Convective Inhibition Energy (CINE). The traditional Showalter Index has been modified to incorporate the thermodynamics over tropical region. MODIS data over South Peninsular India is also used for the study. When there is a convective system over south penin-sular India, the value of LI over the region is less than −4. On the other hand, the region where LI is more than 2 is comparatively stable without any convection. Similarly, when KI values are in the range 35 to 40, there is a possibility for convection. The threshold value for TTI is found to be between 50 and 55. Further, we found that prior to convection, dry bulb temperature at 1000, 850, 700 and 500 hPa is minimum and the dew point tem-perature is a maximum, which leads to increase in relative humidity. The total column water vapor is maximum in the convective region and minimum in the stable region. The threshold values for the different stability indices are found to be agreeing with that reported in literature.