Raveendran Nair, B; Dr.Joseph,Francis D(Cochin University of Science and Technology, December , 1981)
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Abstract:
Urea-formaldehyde resins find numerous
applications in adhesive, textile finishing and moulded
plastic industries. Kinetic investigations of the reactions of
urea and its related compounds with formaldehyde in
aqueous acid, alkaline and neutral media have been carried
out. A thin—layer chromatographic method was developed
for the separation and estimation of the products of these
reactions. Using this technique the various initial steps
in the reactions were analysed and the rate constants have been determined.
Description:
Department of Applied Chemistry, Cochin University of Science and Technology
Thomas,P T; George,K K(Department of Applied Economics, September , 1994)
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Abstract:
It is hoped that the present study by analysing the
dynamics of agrarian change and peasant mobility may contribute
to the on-going debate on this issue in India and other developing
countries. It may also help to throw light on the validity of some
of the theories formulated on the basis of experience in different
regions and at different times. The study is likely to be of
special importance as it covers an area which has one of the
highest densities of population. The area has also witnessed
sweeping changes in agrarian structure as a result of the most
radical land reforms among the Indian states.
Dayana, M.K.; Dr. Varkey, A.M(Cochin University of Science and Technology, October 26, 2015)
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Abstract:
This is a study of land use law in India. Land use Controls has been a subject
of controversy since the human settlement. Gamut of control increased with human
development. Now the controls are for many purposes.Nuisance created through various land use was tried to be avoidedthrough the common law controls7. Whether the utility of the activity outweighs
the environmental consideration was the consideration before the court. A
standard definition8 of nuisance could meet most of the problems relating to land
use. Later on, planning and zoning laws brought in major changes. Health, safety
and facilities of others attracted land use controls9. After the Stockholm the sphere
of government interference increased. Several legislations were enacted. Existing
legislations were modified. These come in conflict with the interests of different
sections of society. Coastal Regulations10 and high range protection11 are
manifestations of such unrest. A systematic study on these issues is of current
interest. Exploring of some areas in this respect is also relevant in this respect.
Sarasu, T N; Dr.George, M J(Cochin University of Science and Technology, March , 1987)
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Abstract:
Lobsters are renowned the world over as tasty delicacies and are in great demand for Epicurian gourests. As a result these animals found in different parts of the world from countries like India they are mostly frozen and exported thus earning considerable foreign exchange for the country. Importance of this crustacean is thus well known and whatever harvested from nature are utilized to the maximum extent. The demand being much more than what is being produced the need for artificial culture becomes evident. In this context a complete knowledge of the lifecycle ,larval biology and their culture is very essential. Thus with the object of studying the life history of the commercially important lobsters fished from Indian waters the larval biology of panulirus homarus has been taken up as the project for the present study
Rejeena, I; Dr. P. Radhakrishnan(Cochin University of Science and Technology, April 23, 2015)
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Abstract:
Nonlinear optics is a broad field of research and technology that
encompasses subject matter in the field of Physics, Chemistry, and Engineering.
It is the branch of Optics that describes the behavior of light in nonlinear media,
that is, media in which the dielectric polarization P responds nonlinearly to the
electric field E of the light. This nonlinearity is typically only observed at very
high light intensities. This area has applications in all optical and electro optical
devices used for communication, optical storage and optical computing. Many
nonlinear optical effects have proved to be versatile probes for understanding
basic and applied problems. Nonlinear optical devices use nonlinear dependence
of refractive index or absorption coefficient on the applied field. These nonlinear
optical devices are passive devices and are referred to as intelligent or smart
materials owing to the fact that the sensing, processing and activating functions
required for optical processes are inherent to them which are otherwise separate
in dynamic devices.The large interest in nonlinear optical crystalline materials has been
motivated by their potential use in the fabrication of all-optical photonic devices.
Transparent crystalline materials can exhibit different kinds of
optical nonlinearities which are associated with a nonlinear polarization. The
choice of the most suitable crystal material for a given application is often far
from trivial; it should involve the consideration of many aspects. A high
nonlinearity for frequency conversion of ultra-short pulses does not help if the
interaction length is strongly limited by a large group velocity mismatch and the
low damage threshold limits the applicable optical intensities. Also, it can be
highly desirable to use a crystal material which can be critically phasematched
at room temperature. Among the different types of nonlinear crystals, metal halides and
tartrates have attracted due to their importance in photonics. Metal halides like
lead halides have drawn attention because they exhibit interesting features from
the stand point of the electron-lattice interaction .These materials are important
for their luminescent properties. Tartrate single crystals show many interesting
physical properties such as ferroelectric, piezoelectric, dielectric and optical
characteristics. They are used for nonlinear optical devices based on their optical
transmission characteristics. Among the several tartrate compounds, Strontium
tartrate, Calcium tartrate and Cadmium tartrate have received greater attention
on account of their ferroelectric, nonlinear optical and spectral characteristics.
The present thesis reports the linear and nonlinear aspects of these crystals and
their potential applications in the field of photonics.
Sajan, D George(Cochin University of Science & Technology, November , 2003)
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Abstract:
Discovery of coherent optical sources four decades ago has revolutionized all fields of scientific development. One of the path breaking applications of lasers is the emergence of various thermo optic techniques to unravel some of the mysteries of light matter interactions.Thermo optic technique is a valuable tool to evaluate optical and thermal properties of materials in solid,liquid and gaseous states .This technique can also be employed effectively in nondestructive quality evaluation. In this doctoral thesis , the use of photothermal techniques based on photoacoustic and photothermal deflection phenomena for the study of certain class of photonics materials such as semiconductors, nano metal dispersed ceramics, composites of conducting polymers and liquid crystals is elaborated.
Description:
International School of Photonics,
Cochin University of Science and Technology
Abdul Rasheed, T M; Dr.Narayanan Nampoori, V P(Cochin University of Science and Technology, September 16, 1987)
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Abstract:
Vibrational overtone spectroscopy of X-H (X=C,N,O) containing molecules is an area of recent interest. The spectroscopic studies of higher vibrational levels yield valuable informations, regarding,the molecular structure, intra- and inter-molecular interactions, radiationless transitions, intra-molecular vibrational relaxations, multiphoton excitations and chemical reactivities, which cannot be z obtained by other spectroscopic methods. This thesis presents the results of experimental investigations on the overtone spectra of some organic compounds in the liquid phase for the characterization of CH bonds. The spectra in the fifth overtone region (1fiV=6) are recorded using a dual beam thermal lens setup and the lower overtones (.AV=2-5) are recorded spectrophotometrically.The thesis is presented in six chapters.
Description:
Department of Physics,Cochin University of Science and Technology
Shibu, Eappen M; Dr.Rajappan Nair,K P(Cochin University of Science and Technology, April 4, 2003)
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Abstract:
Near-infrared spectroscopy can be a workhorse technique for materials
analysis in industries such as agriculture, pharmaceuticals, chemicals and polymers. A
near-infrared spectrum represents combination bands and overtone bands that are
harmonics of absorption frequencies in the mid-infrared. Near-infrared absorption
includes a combination-band region immediately adjacent to the mid-infrared and three
overtone regions. All four near-infrared regions contain "echoes" of the fundamental mid-infrared
absorptions. For example, vibrations in the mid-infrared due to the C-H stretches will
produce four distinct bands in each of the overtone and combination regions. As the
bands become more removed from the fundamental frequencies they become more
widely separated from their neighbors, more broadened and are dramatically reduced in
intensity. Because near-infrared bands are much less intense, more of the sample can be
used to produce a spectra and with near-infrared, sample preparation activities are
greatly reduced or eliminated so more of the sample can be utilized. In addition, long
path lengths and the ability to sample through glass in the near-infrared allows samples
to be measured in common media such as culture tubes, cuvettes and reaction bottles.
This is unlike mid-infrared where very small amounts of a sample produce a strong
spectrum; thus sample preparation techniques must be employed to limit the amount of
the sample that interacts with the beam. In the present work we describe the successful the fabrication and calibration of a linear high resolution linear spectrometer using tunable diode laser and a 36 m path length cell and meuurement of a highly resolved structure of OH group in methanol in the transition region A v =3. We then analyse the NIR spectrum of certain
aromatic molecules and study the substituent effects using local mode theory
Description:
Department of Physics, Cochin University of Science and Technology