Francis Jacob, K; Dr.Mohanan, P(Cochin University of Science and Technology, June , 2008)
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Abstract:
The thesis is the outcome of the exhaustive theoretical and experimental investigations performed on Printed Monopole Antennas loaded with different geometries .The work presented in this thesis describes the development of a 3D- FDTD(Finite Difference Time Domain) Modeller using MATLAB for the numerical computation of the radiation characteristics of the antenna. The predicted results are verified experimentally and also through simulation using Ansoft HFSS.The effect of top loading of the monopole with different geometries ,the dimensions of the loading patch and ground plane and the material parameters of the dielectric substrate upon the radiation performance of the antenna is studied in detail. Optimized Printed Monopole antennas suitable for Ultra Wide Band (UWB) applications have been developed.
Description:
Department of Electronics, Cochin University of
Science and Technology
Markose, K T; Dr.Wilson, P R; Dr.Sankaranarayanan, K C(Cochin University of Science and Technology, April , 2003)
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Abstract:
The study is confined to non-mechanised private and cooperative
granite quarries in Thrissur district. There are 90 non -mechanised
quarries in Thrissur district. Data were collected for the period from 1994-'95 to 1999-2000. 315* March of every year was considered as the closing date of the year. It envisages an analysis of various problems connected with quarrying operations, financial analysis, cost analysis, demand and supply position of quarry products and socio-economic background of workers. It also suggest some measures to improve the working conditions of granite quarrying.
Description:
School of Management Studies, Cochin University of Science & Technology
Jacob,M J; Dr.Krishnamoorthy,A(Cochin University Of Science And Technology, 1987)
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Abstract:
In this thesis we attempt to make a probabilistic
analysis of some physically realizable, though complex,
storage and queueing models. It is essentially a mathematical
study of the stochastic processes underlying
these models. Our aim is to have an improved understanding
of the behaviour of such models, that may widen their
applicability. Different inventory systems with randon1
lead times, vacation to the server, bulk demands, varying
ordering levels, etc. are considered. Also we study some
finite and infinite capacity queueing systems with bulk
service and vacation to the server and obtain the transient
solution in certain cases. Each chapter in the thesis is
provided with self introduction and some important references
Description:
Department of Mathematics and Statistics
Cochin University of Science and
Technology
Hatha, A A M; Mujeeb Rahiman, K M; Yousuf, Jesmi; Ambat,Thomas P(Blackwell Publishing Ltd, 2010)
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Abstract:
Eight hundred and eighty-¢ve strains of bacterial isolates
fromvarious samples associatedwith the natural
habitat ofMacrobrachiumrosenbergii were screened
for their probiotic potential. Two putative probionts
namely Bacillus NL110 and Vibrio NE17 isolated from
the larvae and egg samples, respectively, were selected
for experimental studies and were introduced
to the juveniles of M. rosenbergii (0.080 0.001g)
through di¡erent modes such as through feed, water
and both. The probiotic potential of the above bacteria
in terms of improvements inwater quality, growth,
survival, speci¢c growth rate (SGR), feed conversion
ratio and immune parameters was evaluated. The
treatment groups showed a signi¢cant improvement
in SGR and weight gain (Po0.001). Survival among
di¡erent treatment groups was better than that in
the control group. There were also signi¢cant improvements
in the water quality parameters such as
the concentration of nitrate and ammonia in the
treatment groups (Po0.05). Improvements in immune
parameters such as the total haemocyte count
(Po0.05), phenoloxidase activity and respiratory
burst were also signi¢cant (Po0.001). It is concluded
that screening of the natural micro£ora of cultured
¢sh and shell¢sh for putative probionts might yield
probiotic strains of bacteria that could be utilized for
an environment-friendly and organic mode of aquaculture.
Hatha, A A M; Mujeeb Rahiman, K M; Yousuf, Jesmi; Ambat,Thomas P(Blackwell Publishing Ltd, 2010)
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Abstract:
Eight hundred and eighty-¢ve strains of bacterial isolates
fromvarious samples associatedwith the natural
habitat ofMacrobrachiumrosenbergii were screened
for their probiotic potential. Two putative probionts
namely Bacillus NL110 and Vibrio NE17 isolated from
the larvae and egg samples, respectively, were selected
for experimental studies and were introduced
to the juveniles of M. rosenbergii (0.080 0.001g)
through di¡erent modes such as through feed, water
and both. The probiotic potential of the above bacteria
in terms of improvements inwater quality, growth,
survival, speci¢c growth rate (SGR), feed conversion
ratio and immune parameters was evaluated. The
treatment groups showed a signi¢cant improvement
in SGR and weight gain (Po0.001). Survival among
di¡erent treatment groups was better than that in
the control group. There were also signi¢cant improvements
in the water quality parameters such as
the concentration of nitrate and ammonia in the
treatment groups (Po0.05). Improvements in immune
parameters such as the total haemocyte count
(Po0.05), phenoloxidase activity and respiratory
burst were also signi¢cant (Po0.001). It is concluded
that screening of the natural micro£ora of cultured
¢sh and shell¢sh for putative probionts might yield
probiotic strains of bacteria that could be utilized for
an environment-friendly and organic mode of aquaculture
Bright Singh, I S; Ajitha, S; Sridhar, N; Sridhar, M; Varghese, V(Asian Fisheries Society, March 2, 2004)
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Abstract:
Cell free extracts of four strains of Lactic acid bacteria (LAB) viz. Lactobacillus. acidophilus,
Streptococcus.cremoris, Lactobacillus bulgaricus –56 and Lactobacillus bulgaricus –57 inhibited
growth of Vibrio alginolyticus in nutrient broth. The antagonism of LAB to Vibrio
alginolyticus was further confirmed by streak plating wherein suppression of growth of Vibrio
was obtained.
Juveniles of Penaeus indicus (average weight 0.985 ± 0.1 g) on administering orally a
moist feed base containing 5 × 106 cells·g of the four LAB probionts for a period of four weeks
showed better survival (56 to 72%) when challenged with V. alginolyticus by intra-muscular
injection of 0.1 ml containing 3 × 109 cells·ml. Animals maintained on a diet devoid of bacterial
biomass exhibited 80% mortality. No external or internal pathological changes were observed
in shrimp fed with the LAB incorporated diets. Results showed inhibition of V.
alginolyticus by LAB and stimulation of the non-specific immune response resulting in resistance
to disease in the shrimp fed on LAB incorporated diets.
Description:
Asian Fisheries Science 17 (2004): 71-80
Asian Fisheries Society, Manila, Philippines
Jos, C A; Dr.Pylee,M V(Cochin University of Science And Technology, 1978)
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Abstract:
This study is directed to examine how far price fluctuations in pepper can be controlled in the Indian context so as to have a reasonable and stable income for the primary producers which will ensure an adequate ‘encouragement for higher production and better export earnings. In a study of the methods of controlling violent price fluctuations a important question is that whether the present system of management of supply is satisfactory or not. It is more so when the demand
is likely to be sanimlatsd by the importers and wholesalers of the foreign countries. Though pepper is the most important of all the spices gross in India, little work has been done so far to study the problems and prospects of this commodity.
Description:
School of management studies, Cochin University of Science And Technology
Gopalakrishnan Nayar, K; Dr.Parameswaran, Nair N(Cochin University Of Science And Technology, January 3, 1987)
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Abstract:
The main objective of the study has been to
analyse the marketing problems of Indian cardamom at home
and abroad and examine possible courses of action which
would lead to increased consumption of cardamom, both
within India and abroad. This has been done in the context
of the anticipated increases in the Indian and world
supply of cardamom. Field studies were undertaken to understand
the cost of production of cardamom and cost of export.
This study was also directed at examining how
far price fluctuations in cardamom can be controlled in
the Indian context, so as to have a reasonable and stable
income for primary producers which will ensure adequate
encouragement for higher production and better export
earnings.
Description:
School of Management Studies, Cochin University
of Science and Technology
Merlin,Joseph; Meera Bai,M(Department of Applied Economics, Faculty of Social Sciences, 2002)
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Abstract:
The overall objective of the study is to examine the problems and prospects of the tea on industry in Kerala. The specific objectives are to trace the historical evolution of the tea plantation industry in India with special reference to Kerala and to study the performance of tea plantation industry in Kerala. In order to analyse the growth performance of tea plantation industry in Kerala in a comparative perspective, growth rates for the neighbouring states of Karnataka and Tamilnadu are estimated along with the National, South Indian and North Indian estimates. Tea plantation industry is a labour intensive activity. Productivity has been low primarily because of the over aging. In all the factories visited only Black tea is produced. In factories outmoded machines which installed years ago is still used which will increase the cost of production. The major problem is high cost of production and low price realization. The workers are found to be not satisfied with their working conditions- long journey to work place, absence of resting places, latrine facilities etc. and also the problems arising from dust in the factory. At a macro level the tea plantation industry has been facing the adverse impacts of globalisation and trade liberalization. There is only one solution to this problem that is to improve the competitiveness in production of raw leaf and manufacturing of tea. Government has a very important role with specification of strict quality control
K G Nair ; P R S Pillai ; Vasudevan, K; Mathew, K T; Mohanan, P; Aanandan,C K(Cochin University of Science and Technology, November 29, 2008)
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Abstract:
In this paper we have investigated the effect of cavity diameter and wall height on resonance and radiation characteristics of a circular microstrip patch antenna. Experiments were conducted using a fabricated prototype placed inside a cylindrical cavity. The results were compared and verified with simulated data obtained using an electromagnetic simulator. About 9.6 to 10.5 dBi peak gain was obtained from measured and simulated data
Anantharaman, M R; Solomon, M A; Joy, P A; Philip, Kurian(Taylor & Francis, August 16, 2010)
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Abstract:
Rubber ferrite composites (RFC) are magnetic polymer composites and have a
variety of applications as flexible magnets, pressure=photo sensors, and microwave
absorbers. The mouldability into complex shapes is one of the advantages of these
magnetic elastomers. They have the potential of replacing the conventional ceramic
materials, due to theire flexible nature. In the present study, the incorporation
of pre-characterized hexagonal ferrites, namely barium ferrite (BaFe12O19), into
natural rubber matrix is carried out according to a suitable recipe for various
loadings of the filler. The processability of these compounds was determined by
evaluating the cure characteristics: scorch time, cure time, and minimum and
maximum torque. It has been found that the addition of magnetic fillers does not
affect the processability of the composites, whereas the physical properties are
modified. The magnetic properties of these composites containing various loadings
of the magnetic filler were also investigated. The magnetic properties of RFC can
be controlled by the addition of appropriate amount of the ferrite filler.
Description:
International Journal of Polymeric Materials, 53:565–575, 2004
Anantharaman, M R; Mohamed, E M; Malini, K A; Joy, P A; Kulkarni, S D; Date, S K; Kurian, P(Institute of Materials, published by Maney Publishing, March 2, 2002)
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Abstract:
Rubber ferrite composites have the unique advantage of mouldability, which
is not easily obtainable using ceramic magnetic materials. The incorporation
of mixed ferrites in appropriate weight ratios into the rubber matrix not only
modi es the dielectric properties of the composite but also imparts magnetic
properties to it. Mixed ferrites belonging to the series of Mn(1 – x )Znx Fe2O4
have been synthesised with diVerent values of x in steps of 0·2, using conventional
ceramic processing techniques. Rubber ferrite composites were prepared
by the incorporation of these pre-characterised polycrystallineMn(1 – x )Znx Fe2O4
ceramics into a natural rubber matrix at diVerent loadings according to a
speci c recipe. The processability of these elastomers was determined by investigating
their cure characteristics. The magnetic properties of the ceramic llers
as well as of the rubber ferrite composites were evaluated and the results were
correlated. Studies of the magnetic properties of these rubber ferrite composites
indicate that the magnetisation increases with loading of the ller without
changing the coercive eld. The hardness of these composites shows a steady
increase with the loading of the magnetic llers. The evaluation of hardness
andmagnetic characteristics indicates that composites with optimummagnetisation
and almost minimum stiVness can be achieved with a maximum loading
of 120 phr of the ller at x=0·4. From the data on the magnetisation of the
composites, a simple relationship connecting the magnetisation of the rubber
ferrite composite and the ller was formulated. This can be used to synthesise
rubber ferrite composites with predetermined magnetic properties
Description:
Plastics, rubber and composites,vol 31,issue 3,pp 106-113
Abesh, Reghuvaran; Dr. Anita Das, Ravindranath(Cochin University of Science And Technology, April , 2013)
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Abstract:
In this study, a novel improved technology could be developed to convert
the recalcitrant coir pith into environmental friendly organic manure. The standard
method of composting involves the substitution of urea with nitrogen fixing
bacteria viz. Azotobacter vinelandii and Azospirillum brasilense leading to the
development of an improved method of coir pith. The combined action of the
microorganisms could enhance the biodegradation of coir pith. In the present study,
Pleurotus sajor caju, an edible mushroom which has the ability to degrade coir
pith, and the addition of nitrogen fixing bacteria like Azotobacter vinelandii and
Azospirillum brasilense could accelerate the action of the fungi on coir pith. The
use of these microorganisms brings about definite changes in the NPK, Ammonia,
Organic Carbon and Lignin contents in coir pith. This study will encourage the use
of biodegraded coir pith as organic manure for agri/horti purpose to get better
yields and can serve as a better technology to solve the problem of accumulated
coir pith in coir based industries
Description:
School of Environmental Studies, Cochin University of Science & Technology
Rays, belonging to the class Elasmobranchii, constitute a major fishery in many states in India
like Tamil Nadu, Gujarat, Andhra Pradesh, Kerala and Maharashtra. The estimated landings are
21,700 tonnes per annum. Even though the meat of rays is nutritious and free from bones and spines,
there is little demand for fresh meat due to the presence of a high urea content. The landings are
mainly used for salt curing which fetches only very low prices for the producers.
Urea nitrogen constituted the major component (50.8%) of the non-protein nitrogen of the
meat. An attempt has been made to standat-dize the processing steps to reduce the urea levels in the
meat before freezing by using different simple techniques like dipping the fillets in stagnant chilled
water, dipping in chilled running water and dipping in stirred chilled running water. It was found
that meat dipped in stirred running water for two hours reduced the urea level of the meat by 62%.
The yield of the lateral fin fillets and caudal fin fillets vary with the size of the ray. The drip loss
during frozen storage is found to be more in the case of samples frozen stored after the treatment for
urea removal by the method of stirring in running water. The samples treated in stagnant chilled
water had the lowest drip loss. The total nitrogen was higher in samples treated in stagnant chilled
water and lowest in the samples treated in stirred running water. The overall acceptability was high
in the case of samples treated with stirred running water and frozen stored
Gopinatha Menon,G; Dr.Ranganathan, N(Cochin University of Science and Technology, April 22, 1987)
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Abstract:
The present Study is designed to gather, record and
analyse data on history of pepper, pepper production,
procurement and marketing with particular reference to
Kerala. The main emphasis is given to study the'role
of cooperative sector with regard to procurement and
export efforts and also the services rendered by cooperative
sector agencies under MARKETFED and NAFED
to pepper trade. The scope of the Study covers the
botany, methods of cultivation, fertilizer application,
pest control management and other related aspects of
pepper. Taking into consideration Kerala's supremacy
in pepper cultivation and production, detailed study
of its production, procurement, internal and export
marketing with reference to Kerala has been given importance.
As Kerala accounts for 96 per cent1 of the
pepper cultivation and 94 per cent of the pepper production,
the present study is entirely confined to
Kerala
Description:
School of Management Studies, Cochin
University of Science and Technology