Augustin, Antony; Dr. Babu, Philip(Cochin University of Science and Technology, December 8, 1994)
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Abstract:
A comparative study of Glycogen phosphorylase from selected Cephalopods is reported in this thesis. A detailed investigation of an important glycolytic enzyme, phosphorylase, from a selected species, is undertaken. Loligo vulgaris, commonly known as squid, is selected as the source for the study. Phosphorylase is the key enzyme in the mobilization of chemical energy from glycogen and its role in the regulation of carbohydrate metabolism is well established. Although a good deal of information is available about phosphorylase from terrestrial animals, not much is known about the enzyme from aquatic fauna. In order to bridge this gap and also to compare the results with the findings from other sources, phosphorylase a was isolated from this marine mollusc and its properties studied in detail in this study
Description:
School of Marine Sciences, Cochin University of Science & Technology
Kannan, Balakrishnan; Harsha, K M; Facila Chinchu, O; Cini, Kurian(February 9, 2013)
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Abstract:
A primary medium for the human beings to communicate through language is Speech. Automatic Speech Recognition is wide spread today. Recognizing single digits is vital to a number of applications such as voice dialling of telephone numbers, automatic data entry, credit card entry, PIN (personal identification number) entry, entry of access codes for transactions, etc. In this paper we present a comparative study of SVM (Support Vector Machine) and HMM (Hidden Markov Model) to recognize and identify the digits used in Malayalam speech.
Bindhu, Jacob; Dr.Sugunan, S(Cochin University of Science & Technology, February , 1998)
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Abstract:
In this thesis an attempt has been made to compare the catalytic activity of
some medium and large pore zeolites in a few alkylation and acylation reactions. The
work reported in the present study is basically centered around the following zeolites
namely, ZSM-5, mordenite, zeolite Y and beta. The major reactions carried out were
benzoylation of o-xylene, propionylation of toluene and anisole and benzylation of 0xylene.The programme involves the synthesis, modifications and characterization of
the zeolite catalysts by various methods. The influence of various parameters such as
non-framework cations, Si/AI ratio of zeolites, temperature of the reaction, catalyst
concentration, molar ratio of the reactants and recycling of the catalysts were also
examined upon the conversion of reactants and the formation of the desired products
in the alkylation / acylation reactions.The general conclusions drawn by us from the results obtained are summarized
in the last chapter of the thesis. Zeolite beta offers interesting opportunities as a
potential catalyst in alkylation reactions and the area of catalysis by medium and large
pore zeolites is very fascinating and there is plenty of scope for further research in this
field. Moreover, zeolite based catalysts are effective in meeting current industrial
processing and more stringent environment pollution limits.
Description:
Department of Applied Chemistry, Cochin
University of Science and Technology
Bindhu, Jacob; Dr.Sugunan, S(Cochin University Of Science And Technology, February 13, 1998)
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Abstract:
Zeolites have established themselves as industrial catalysts for over two
decades for a variety of hydrocarbon processing reactions where acidity and shape
selectivity are important factors. As solid catalysts, zeolites may be advantageous and
superior compared to their homogenous counterparts due to their characteristic
properties. It is only in recent years that the utility of zeolites for organic synthesis is
recognized for producing specific organic intermediates and fine chemicals in high
selectivity.
In this thesis an attempt has been made to compare the catalytic activity of
some medium and large pore zeolites in a few alkylation and acylation reactions. The
work reported in the present study is basically centered around the following zeolites
namely, ZSM-5, mordenite, zeolite Y and beta. The major reactions carried out were
benzoylation of o-xylene, propionylation of toluene and anisole and benzylation of oxylene.
.
The programme involves the synthesis, modifications and characterization of
the zeolite catalysts by various methods. The influence of various parameters such as
non-framework cations, Si/Al ratio of zeolites, temperature of the reaction, catalyst
concentration, molar ratio of the reactants and recycling of the catalysts were also
examined upon the conversion of reactants and the formation of the desired products
in the alkylation/ acylation reactions.
The general conclusions drawn by us from the results obtained are summarized
in the last chapter of the thesis. Zeolite beta ofi'ers interesting opportunities as a
potential catalyst in alkylation reactions and the area of catalysis by medium and large
pore zeolites is very fascinating and there is plenty of scope for further research in this
field. Moreover, zeolite based catalysts are effective in meeting current industrial
processing and more stringent environment pollution limits.
Description:
Department of Applied Chemistry, Cochin
University of Science and Technology
Narayanan, K P; Baiju, Sasidharan; Aneesh, K N(IJIRSET, December , 2013)
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Abstract:
Welding of high strength and low weight materials like Aluminium Alloys without any defects by conventional
welding techniques is a major challenge in industries. Hence research on solid state welding techniques like Friction
stir welding and Friction welding techniques have got much importance in joining of Aluminium alloys. However
most of the industries are not changing conventional techniques as skilled workers are available on that area. Most
common conventional welding techniques used for joining of Aluminium alloys are Gas welding and Arc welding.
Friction welding is a solid-state welding process that generates heat through mechanical friction between a moving
and a stationary component with the addition of a lateral force called “upset” to plast ically displace and fuse the
materials. In this work, experimental study on tensile and micro structural characteristics of welded joints formed
from conventional welding techniques and Rotary friction welding(suitable for weld specimens with circular cross
section) has been carried out and the same were compared. The process parameters for arc welding used was 50-70
Amp reverse polarity DC and electrodes of 2.3mm diameter. In Gas welding, the parameters were oxy acetylene
neural flame at 3200°C and 3mm electrodes . In the case of friction welding an axial pressure loading of 3Mpa with
5 MPa as upsetting pressure and 500 rpm were used to obtain good welded joints. Tensile characteristic studies of
Arc welded joints and Gas welded joints showed 48% and 60 % variations respectively from the maximum load
bearing characteristics of parent metal. In the case of friction welded joint, the variation was found to 46%. Micro
structural evaluation of conventionally welded joints exhibited clear distinct zones of various weld regions. In the
case of friction welded joint micro structural photographs showed comparable features both in parent metal and
welded region. Thus the tensile characteristic study and microstructure evaluations proved that friction welded joints
are good in both aspects compared to conventionally welded joints.
Description:
International Journal of Innovative Research in Science, Engineering and Technology,Volume 2, Special Issue 1, December 2013
Devadasan,K; Dr.Gopakumar, K(Cochin University of Science and Technology, December , 1982)
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Abstract:
This thesis is an attempt to make a comparative study of the composition of the muscle proteins of some commercially important species of fishes and shell fishes of our coast and their changes during preservation and processing. As a part of this the distribution of the major protein nitrogen fractions in several species of fishes and shell fishes was studied in detail.
Anwarul Islam, MD; Dr.Ranganathan, N(Cochin University Of Science And Technology, November 5, 1988)
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Abstract:
For improving agricultural marketing, which has
been discussed in the previous chapter, the Government has
intervened in different ways. The direct regulatory role
through the regulation of markets and market practices is one
of the ways in which governmental intervention can improve
agricultural marketing. This study is an enquiry of the direct
regulatory role of the government through regulation of markets
and market practices. By restructuring the operational methods
and redesigning the existing physical markets, this system
gives direct benefit to the cultivating class and protects
them from the market manipulations of organised and powerful
private traders. If traders do not continue their trade for
the time being they will not be affected financially, because
they are resourceful or financially solvent. On the other
hand, Cultivators must sell their produce immediately after
harvesting for the lack of additional facilities or to satisfy
other needs for which finance is required. Another important
reason is that Cultivators/farmers are not organised and because of lack of their organisation, they sell their produces
individually. In this situation, a farmer is helpless when
astute traders indulge in manipulations at the time of purchase of the produces. So it is the government's obligation to protect the interest of the farmers. Protection of the farmer/cultivator is necessary not only from the point of social justice but also from that of economic growth. If the farmers are assured of a remunerative or incentive price for their produce, they will get the inspiration to produce more and through more production, economy will be developed and
the nation as a whole will be benefitted.
This study will examine the management system of the
markets through the direct regulatory role played by the
governments to control markets and market practices in West
Bengal and Bangladesh.
Description:
School Of Management Studies,
Cochin University Of Science And Technology
Poulose Jacob,K; Sonia, Sunny; David, Peter S(Cochin University of Science and Technology, 2013)
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Abstract:
Speech is a natural mode of communication for people and speech recognition is an intensive area of research due to its versatile applications. This paper presents a comparative study of various feature extraction methods based on wavelets for recognizing isolated spoken words. Isolated words from Malayalam, one of the four major Dravidian languages of southern India are chosen for recognition. This work includes two speech recognition methods. First one is a hybrid approach with Discrete Wavelet Transforms and Artificial Neural Networks and the second method uses a combination of Wavelet Packet Decomposition and Artificial Neural Networks. Features are extracted by using Discrete Wavelet Transforms (DWT) and Wavelet Packet Decomposition (WPD). Training, testing and pattern recognition are performed using Artificial Neural Networks (ANN). The proposed method is implemented for 50 speakers uttering 20 isolated words each. The experimental results obtained show the efficiency of these techniques in recognizing speech
Sreekumar, K; Thomas, Mathew; Mirajkar, S P; Sugunan, S; Rao, B S(Elsevier, 2000)
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Abstract:
The catalyst compositions of the Zn1−xCOxFe2O4 (x= 0, 0.2, 0.5, 0.8 and 1.0) spiel series possessing ‘x’ values, x less than or equal to 0.5, are
unique for selective N-monomethylation of aniline using methanol as the alkylating agent. Since dimethyl carbonate (DMC)
is another potential non-toxic alkylating agent, alkylation of aniline was investigated over various Zn–Co ferrites using DMC
as the alkylating agent. The merits and demerits of the two alkylating agents are compared. Catalytic activity followed a
similar trend with respect to the composition of the ferrospinel systems. DMC is active at comparatively low temperature,
where methanol shows only mild activity. However, on the selectivity basis, DMC as an alkylating agent could not compete
with methanol, since the former gave appreciable amounts of N,N-dimethylaniline (NNDMA) even at low temperature where
methanol gave nearly 99% N-methylaniline (NMA) selectivity. As in the case of methanol, DMC also did not give any
C-alkylated products.
Jyothi, T M; Sugunan, S; Rao, B S(Catalysis Letters, 2000)
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Abstract:
A comparative study on the anisole methylation with methanol over lanthanum-promoted Sn02 catalyst and its sulfate-doped analogue
is presented. A maximum 2.6-xylenol selectivity of 82% was achieved at 400 degreeC under optimized conditions at an anisole
conversion of 65% over lanthanum-promoted Sn02 catalyst. The sulfate modification resulted in the dealkylation of anisole to phenol
followed by several unselective side reactions due to the creation of strong acid sites. The activity of lanthanum-modified tin oxide
catalysts in the selective formation of 2.6-xylenol is ascribed to the presence of weak Lewis acid sites and comparatively stronger basic
sites.
Garcia,Garcia J; Bonache,J; Gil,I; Martin,F; Marques,R; Falcon,F; Lapetegi,T; Laso,M A G; Sorolla,M(Microwave and Optical Technology Letters, February 20, 2005)
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Abstract:
In this paper, microstrip lines magnetically coupled to splitring
resonators (SRRs) are conquved to electromagnetic bundgup (EBG)
nr,rrostrip lines in terns q/ their stop-heard penjbrnmrnce and dimensions. In
bath types o/ trunsmis•siou lines, signal propagation is inhibited in it certain
jequency bwuL For EBG microstrip lines, the central frequency of such a
forbidden band is determined by the period of the structure, whereas in
SRR-hased microstrip lines the position of the frequency gap depends on
the quasi-static resonant frequency of the rings. The main relevant conrributiun
of this paper is to provide a tuning procedure to control the gap width
in SRR microstrip lines, and to show that by using SRRs, device dimensions
ale much smaller than those required by EBGs in order to obtain similar
stop-banal performance. This has been demonstrated by fill-wave electromagnetic
simulations and experimentally verified from the characterization
ql two fabricated microstrip lines: one with rectangular SRRs etched on the
upper substrate side, and the other with a periodic perturbation cf'strip
width. For similar rejection and 1-(;H,. gap width centered at 4.5 Gllz, it
has been found that the SRR microstrip line is•,fve times shorter. In addition,
no ripple is appreciable in the allowed band for the .SRR-hared structure,
whereas due to dispersion, certain mismatch is expected in the EBG
prototype. Due to the high-frequency selectivity, controllable gap width, and
small dimensions, it is believed that SRR coupled to planar transmission
lines can have an actual impact on the design of stop-band filters compatible
with planar technology, and can be an alternative to present solutions based on distributed approaches or EBG
Rani, Joseph; Lakshmi,K; Honey, John; George,K E; Mathew, K T(Wiley InterScience, June 21, 2007)
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Abstract:
Microwave properties of conductive polymers is crucial
because of their wide areas of applications such as coating in reflector
antennas, coating in electronic equipments, firequenry selective .surfaces,
EMI materials, satellite communication links, microchip antennas, and
medical applications. This work involves a comparative study of dielectric
properties of selected conducting polymers such as polyaniline.
poly(3,4-eth),lenedio.syt2iophene), polvthiophene, polvpvrrole. and
pohparaphenylene diazomethine (PPDA) in microwave and DC,fields.
The inicrowave properties such as dielectric constant, dielectric loss.
absorption coefficient, heating coefficient, skin depth, and conductivity in
the microwave frequency (S hand), and DC fields were compared. PEDOT
and polccuiiline were found to exhibit excellent properties in DC
field and microwave frequencies, which make thein potential materials
in many of the alorenientioned applications
Sumam, Mary Idicula; Savitha, Sam Abraham(IEEE, 2012)
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Abstract:
This paper compares statistical technique of
paraphrase identification to semantic technique of
paraphrase identification. The statistical techniques
used for comparison are word set and word-order
based methods where as the semantic technique used is
the WordNet similarity matrix method described by
Stevenson and Fernando in [3].
Description:
2012 International Conference on Data Science & Engineering (ICDSE)
Shavit,R; Taig,I(Microwave and Optical Technology Letters, July 20, 2004)
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Abstract:
In this paper, a comparison study among three neuralnetwork
algorithms for the synthesis of array patterns is presented. The
neural networks are used to estimate the array elements' excitations for
an arbitrary pattern. The architecture of the neural networks is discussed
and simulation results are presented. Two new neural networks,
based on radial basis functions (RBFs) and wavelet neural networks
(WNNs), are introduced. The proposed networks offer a more efficient
synthesis procedure, as compared to other available techniques