Joseph, Babitha; Dr Prathapachantra Kurup, M R(Cochin University of Science And Technology, November 20, 2014)
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Abstract:
The ability of aroylhydrazones to bind with transition metals is a
developing area of research interest and the coordinating properties of
hydrazones can be tuned by the appropriate choice of parent aldehyde or
ketone and the hydrazide. So in the present work we selected four different
aroylhydrazones as principal ligands. Introduction of heterocyclic bases like
1,10-phenanthroline, 2,2′-bipyridine, 3-picoline and pyridine leads to the
syntheses of mixed ligand metal chelates which can cause different bonding
modes, spectral properties and geometries in coordination compounds. The
importance of aroylhydrazones and their complexes in various fields and their
interesting coordinating properties stimulate our interest in the investigation of
transition metal chelates with four different aroylhydrazones. The aroylhydrazones
selected are 4-benzyloxy-2-hydroxybenzaldehyde-4-nitrobenzoylhydrazone
dimethylformamide monosolvate, 5-bromo-2-hydroxy-3-methoxybenzaldehyde
nicotinoylhydrazone dihydrate methanol monosolvate, 4-diethylamino-2-
hydroxybenzaldehyde nicotinoylhydrazone monohydrate and 2-benzoylpyridine-
4-nitrobenzoylhydrazone. The selection of 4-benzyloxy-2-hydroxybenzaldehyde-
4-nitrobenzoylhydrazone was based on the idea of developing ligands having
D-π-A general structure, so that the proligand and metal complexes exhibit
NLO activity. Hence it is interesting to explore the coordinating capabilities
of the synthesized hydrazones and to study the NLO activity of hydrazones
and some of the metal complexes.
Nasser, A K V; Dr.James, P S B R(Cochin University Of Science And Technology, July , 1993)
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Abstract:
Extensive investigations on the distribution and
biology of skipjack tuna are available but less is known of the
bait fishes on which this fishery depends and what is known is
inadequate, fragmentary and of cursory nature. The information
available on tuna livebait fishes of Lakshadweep are mainly
cofined to short term surverys aimed at estimating theiravailability and abundance. Reports on the biology of a few
species from Minicoy are also present in the literature. This
study was, therefore, prompted by a paucity of information on
1) the livebits of Minicoy, 2) livebait fishery of the northern
islands and 3) knowledge of livebait ecology
Description:
School Of Marine Sciences
Cochin University Of Science And Technology
Achamma, Kurian; Thomas Lee, S; Unnikrishnan, K P; Sajan, D George; Nampoori, V P N; Vallabhan, C P G(World Scientific, 2003)
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Abstract:
Two-photon absorption spectrum of aniline is recorded using thermal lens effect with
optical parametric oscillator as the pump source. Studies show that the two-photon
absorption spectrum observed corresponds to I Al -. I B2 transition of aniline.
Saseendran Pillai, P R; Dr.Sreedhar, C S(Cochin University of Science and Technology, December , 1981)
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Abstract:
The thesis presented here includes the designing of underwater transducer arrays, taking into account the ‘interaction effects’ [30] among the closely packed radiators.
Methods of minimizing the ‘interaction effects‘ by modifying the radiating aperture, are investigated. The need for this study arises as it is one of the important peculiar limitations that stands in the way of achieving maximum range of transmission of acoustic signals. Application of the modified array format for the generation of narrow beam low frequency sound waves, through nonlinear interactions, is discussed. Other techniques that can be advantageously
exploited in array synthesis are also investigated
Description:
Department of electronics and communication systems, Cochin University of Science And Technology
Basil, Mathew; Dr.Sharma,G S(Cochin University of Science And Technology, October , 1982)
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Abstract:
Of the several physical processes occurring in the sea, vertical motions have special significance
because of their marked effects on the oceanic environment. upwelling is the process in the sea
whereby subsurface layers move up towards the surface. The reverse process of surface water sinking to subsurface depths is called sinking. Upwelling is a very conspicuous feature along the west coasts of continents and equatorial regions, though upwelling also occurs along certain east coasts of continents and other regions, The Thesis is an outcome of some investigations
carried out by the author on upwelling and sinking off the west and east coasts of India. The aim of the study is to find out the actual period and duration of upwelling and sinking, their driving mechanism, various associated features and the factors that affect these processes. It is achieved by analysing the temperature and density fields off the west and east coasts of India, and further conclusions are drawn from the divergence field of surface currents, wind stress and sea level variations.
Description:
School of marine sciences, Cochin University of Science And Technology
Gisha, Sivan; Dr.Radhakrishnan,C K(Cochin University of Science and Technology, March , 2007)
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Abstract:
Studies reveal the presence of enzymes and different proteins in the venom
of S.argus. The present study detected the presence of phosphodiesterase in S.
argus venom. S. argus venom has displayed the presence of micromolar
concentration of acetylcholine. Phospholipase activity in S. argus venom shows
values below the detection threshold indicating that the venom does not possess
this enzyme. The proteolylic activity of S. argus venom on casein and gelatin
were assayed due to the probable involvement of proteases in causing the
instability of biological activities of the fish venom. Caseinase and gelatinase
enzymes were detected in S. argus venom. Though exact relationships of these
enzymes and proteins in envenomation are not traced, the involvement of
enzymes in envenomation cannot be ruled out. Further studies are required to
find the mechanism of action of these enzymes and proteins present in S. argus venom. The present study opens new dimensions for isolation of the lethal
compound present in S. argus venom. The preliminary study carried out here
shows the presence of a lethal factor between 6.5 KDa - 68 KDa.
Studies conclude that fish venom possesses many bioactive substances,
especially peptides, proteases and enzymes that bind with high affinity to
physiological targets and can be trapped for therapeutic purposes in the near
future. Even though this study reveals the conundrums of S. argus venom, it
opens new vistas of research on the venom components and the application and
design of the venom as a drug.
Description:
Department of Marine Biology, Microbiology and Biochemistry, Cochin University
of Science and Technology
Sini, Joys Mathew; Dr.Rengarajan, K(Cochin University of Science and Technology, July , 1996)
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Abstract:
The present study is carried out to understand (i) the incidence and occurrence of species of Vibrio in different culture systems in and around Cochin, (ii) characteristics of vibrios isolates, their ecology including growth response to various hydrological parameters, sensitivity to about 40 antibiotics, and (iii) role of physico-chemical parameters in pathogenicity of vibrios, etc. and the results emerged from the investigations are important and encouraging for better understanding of the 'vibriosis' in the culture systems to develop remedial measures to control diseases. The Thesis begins with an “Introduction” followed by “A review of literature” on diseases of penaeid shrimps with particular reference to 'vibriosis' and “Material and methods” which details with the methods and procedures followed in the experiments and analyses of data. This Thesis consists of three chapters. Chapter Ideals with the incidence and ecology of Vibrio spp. in water, sediment and in juveniles of the Indian white prawn Penaeus indicus in the culture systems. In Chapter 2, characteristics of vibrio isolates including growth response to various
levels oftemperature, salinity and pl 1, sensitivity to 40 antibiotics and minimal inhibitory concentration tests are detailed.e out-breaks. The Chapter 3 discusses the role of physico-chemical parameters in the incidence, seasonal abundance of Vibrio spp. and in 'vibriosis'. A summary of the whole work and list of references are also included at the end. This study gives a detailed information regarding the incidence and ecology of vibrios in the culture systems. their characteristics and pathogenicity
Peethambaran, N R; Dr.Kuriakose, A P(Cochin University Of Science And Technology, March 30, 1990)
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Abstract:
In the present work, studies on vulcanization, rheology
and reinforcement of natural rubber latex with special reference
to accelerator combinations, surface active agents and gamma
irradiation have been undertaken. In vulcanization, the choice
of vulcanization system, the extent and mc-zie of vulcanization
and network structure of the vulcanizate are important factors
contributing to the overall quality of the product. The vulcanization
system may be conventional type using elemental sulfur
or a system involving sulfur donors. The latter type is used
mainly in the manufacture of heat resistant products. For improving
the technical properties of the products such as modulus
and tensile strength, different accelerator combinations are used.
It is known that accelerators have a strong effect on the physical
properties of rubber vulcanizates. A perusal of the literature indicates that fundamental studies on the above aspects of latex technology are very limited. Thereforea systematic study on vulcanization, rheology and reinforcement of natural rubber latex with reference to the effect of accelerator combinations, surface active agents and gamma irradiation has been undertaken. The preparation and evaluation of some products like
latex thread was also undertaken as a part of the study.
The thesis consists of six chapter
Description:
Department of Polymer Science
and Rubber Technology, Cochin University of Science and Technology
Zinc butyl xanthate [Zn(bxt)2] was prepared
in the laboratory . The effect of this xanthate with zinc
diethyl dithiocarbamate (ZDC) on the vulcanization of natural
rubber ( NR), polybutadiene rubber (BR), and NR/BR
blend has been studied at different temperatures. The
amounts of Zn (bxt)2 and ZDC in the compounds were optimized
by varying the amount of ZDC from 0 . 75 to 1.5 phr
and Zn (bxt)2 from 0 . 75 to 1 .5 phr. The cure characteristics
were also studied . HAF filled NR, BR, and NR / BR blend
compounds were cured at different temperatures from 60 to
150 C. The sheets were molded and properties such as tensile strength, tear strength, crosslink density and elongation
at break, compression set, abrasion resistance, etc. were
evaluated. The results show that the mechanical properties
of 80NR/20BR blends are closer to that of NR vulcanizates,
properties of 60NR/40BR blends are closer to BR vulcanizates,
while the 70NR/30BR blends show an intermediate
property.
James, K C; Dr.Bhasi, M(Cochin University of Science and Technology, 2007)
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Abstract:
This thesis deals with the use of simulation as a problem-solving tool to solve a
few logistic system related problems. More specifically it relates to studies on
transport terminals. Transport terminals are key elements in the supply chains of
industrial systems. One of the problems related to use of simulation is that of the
multiplicity of models needed to study different problems. There is a need for
development of methodologies related to conceptual modelling which will help
reduce the number of models needed. Three different logistic terminal systems
Viz. a railway yard, container terminal of apart and airport terminal were selected
as cases for this study. The standard methodology for simulation development
consisting of system study and data collection, conceptual model design, detailed
model design and development, model verification and validation,
experimentation, and analysis of results, reporting of finding were carried out.
We found that models could be classified into tightly pre-scheduled, moderately
pre-scheduled and unscheduled systems. Three types simulation models( called
TYPE 1, TYPE 2 and TYPE 3) of various terminal operations were developed in
the simulation package Extend. All models were of the type discrete-event
simulation. Simulation models were successfully used to help solve strategic,
tactical and operational problems related to three important logistic terminals as
set in our objectives. From the point of contribution to conceptual modelling we
have demonstrated that clubbing problems into operational, tactical and strategic
and matching them with tightly pre-scheduled, moderately pre-scheduled and
unscheduled systems is a good workable approach which reduces the number of
models needed to study different terminal related problems.
Description:
School of Engineering,Cochin University of Science and Technology
Suneela,S S; Dr.Viswanadham,D V; Dr.Ram Mohan,H S(Cochin University of Science And Technology, January , 1989)
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Abstract:
The deteriorating air quality especially in urban
environments is a cause of serious concern. In spite of being
an effective sink, the atmosphere also has its own
limitations in effectively dispersing the pollutants being
dumped into it continuously by various sources, mainly
industries. Many a time, it is not the higher emissions that
cause alarming level of pollutants but the unfavourable
atmospheric conditions under which the atmosphere is not able
to disperse them effectively, leading to accumulation of
pollutants near the ground. Hence, it is imperative to have
an estimate of the atmospheric potential for dispersal of
the substances emitted into it. This requires a knowledge of
mixing height, ventilation coefficient, wind and stability of
the region under study. Mere estimation of such pollution
potential is not adequate, unless the probable distribution
of concentration of pollutants is known. This can be
obtained by means of mathematical models. The pollution
potential coupled with the distribution of concentration
provides a good basis for initiating steps to mitigate air
pollution in any developing urban area. In this thesis, a
fast developing industrial city, namely, Trivandrum is chosen
for estimating the pollution potential and determining the
spatial distribution of sulphur dioxide concentration. Each
of the parameters required for pollution potential is
discussed in detail separately. The thesis is divided into
nine chapters.
Description:
School of Marine Sciences, Cochin University of Science and Technology