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
Sreenivasan, P V; Dr. Philip, Kurian(Cochin University of Science & Technology, October , 2007)
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Abstract:
The present study aims at the preparation of an ABS
(acrylonitrile-butadiene-styrene) type toughened thermoplastic by melt blending polystyrene (PS) and powdered nitrile rubber (NBR). The product is an interesting
class of toughened thermoplastic, which would combine the superior mechanical
and processing characteristics of PS and the excellent oil-resistant properties of
NBR. In this thesis an attempt has been made to investigate systematically the
effect of compatibilisation and dynamic vulcanisation on the morphology and
properties of powdered nitrile rubber toughened polystyrene.
Description:
Department of Polymer Science and Rubber Technology, Cochin University of
Science and Technology
The principal objective of this study was to explore the compatibility of a blend of
two synthetic elastomers viz., ethylene-propylene-diene rubber (EPDM) and
chlorobutyl rubber (CIIR). Various commercial grades of EPDM were blended
with a specific grade of CIIR at different proportions. The mechanical properties such
as tensile strength, tear strength, ageing resistance, etc. were studied. On the basis of
the observed physical properties, two particular grades of EPDM were found to be compatible
with CIIR. Differential scanning calorimetry and scanning electron microscopy
confirmed the results. Chlorosulphonated polyethylene was added as a compatibilizing
agent to overcome the phase separation of the other two incompatible grades of EPDM
in blending with CIIR. The results revealed that the addition of compatibilizer greatly
improves the compatibility and thereby the properties of the blends.
Valsamma, Paul; Dr.Chandrasekharan, N S(Cochin University of Science and Technology, December , 1995)
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Abstract:
This thesis Entitled compensation to workmen for industrial injuries.Evaluation of the different forms of liability for compensating industrial injuries makes it evident that the liability under the social insurance scheme is the most befitting one, as it eliminates the problem of evasion of liability by the employer by providing for sharing of liability. Liability for compensation under the workmen's Compensation Act, 1923 and the Employees' State Insurance Act, 1948 arises only in the case of accidents, arising in the course of and out of employment. Majority of the workers, covered by the workmen's Compensation Act, have supported lumpsum payment of compensation under the Act. It appears that workers are ignorant of the cemerits of lumpsum payment. So, the workers should be properly educated by the Inspectorate, proposed above, about the comparative advantages of periodical payments. It is suggested that the workmens Compensation Act, 1923 may be amended, imposing fee upon the parties for each adjournment. It is also suggested that provision may be made in the workmens Compensation Act, 1923 for the expeditious despatch of amendments of the Workmen's Compensation Act, 1923, the Workmens· Compensation Rules, 1924 and the Schedules, made from time to time, to the comrnissioners for workmens Compensation, This will help them mete out justice to an injured workman, as required by the changes in the law. The Employees' State Insurance Act, 1948 and the Rules may be amended, requiring the employers to provide the employees with necessary information, in the vernacular language, about the employment injury benefits available under the Employees' State Insurance Act, 1948 and the formalities for obtaining the same. This will help the illiterate employees, especially the casual ones, avail of employment injury benefits. Changes in the law, on the lines suggested above, are imperative to make the system of compensation for industrial injuries prove effective and beneficial to injured workmen.
Description:
Department of Law,
Cochin University of Science and Technology
Bank switching in embedded processors having partitioned memory architecture results in code size as well as run time overhead. An algorithm and its application to assist the compiler in eliminating the redundant bank switching codes introduced and deciding the optimum data allocation to banked memory is presented in this work. A relation matrix formed for the memory bank state transition corresponding to each bank selection instruction is used for the detection of redundant codes. Data allocation to memory is done by considering all possible permutation of memory banks and combination of data. The compiler output corresponding to each data mapping scheme is subjected to a static machine code analysis which identifies the one with minimum number of bank switching codes. Even though the method is compiler independent, the algorithm utilizes certain architectural features of the target processor. A prototype based on PIC 16F87X microcontrollers is described. This method scales well into larger number of memory blocks and other architectures so that high performance compilers can integrate this technique for efficient code generation. The technique is illustrated with an example
Description:
International Journal of Software Engineering and Its Applications
Vol. 6, No. 1, January, 2012
Girish Kumar,K; Saji John,Konnully(Department of Applied Chemistry, April 15, 2006)
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Abstract:
This paper reports the synthesis of a series of six new polystyrene anchored metal complexes of Co(II), Fe(III), Ni(II),
Cu(II), Zn(II), and dioxouanium(VI) using the polystyrene anchored Schiff base of 2-nitrobenzaldehyde and the corresponding
metal salts. The metal salts used were anhydrous FeCl3, CoCl2 Æ 6H2O, Ni(CH3COO)2 Æ 4H2O, Cu(CH3-
COO)2 Æ H2O, Zn(CH3COO)2 Æ 2H2O, and UO2(CH3COO) Æ 2H2O. Physico chemical characterizations have been made
from diffuse reflectance and vibrational spectra, elemental analysis, magnetic measurements, and TG studies. The elemental
analysis suggest a 1:2 metal:ligand ratio when the complexation has carried out at 70 C for about 12 h reflux. The
ligand is monodentate and coordinates through the azomethine nitrogen. The Fe(III), Co(II), Ni(II), and Cu(II) complexes
are all paramagnetic whereas Zn(II) and U(VI) are diamagnetic. Zn(II) is assigned a tetrahedral structure, Cu(II) and
Co(II) are assigned a square planar structure and Fe(III), Ni(II), and U(VI) are all assigned an octahedral structure.
The polystyrene anchored ligand has been developed as an excellent reagent for the removal of Cu(II). Optimum conditions
have been developed for the removal of metal ion from solutions by studying the effect of change of concentration of
metal ion, ligand, effect of pH, time of reflux, and interference effect of other ions. It was found that within a span of 20 min
it is possible to remove 90% of the metal ion from a 30 ppm metal ion solution in the pH range 4–5.5.
Pravitha, Ramanand; Nampoori, V P N; Sreenivasan, R(Imperial College Press, 2004)
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Abstract:
n this paper, a time series complexity analysis of dense array electroencephalogram signals is carried out using the recently introduced Sample Entropy (SampEn) measure. This statistic quantifies the regularity in signals recorded from systems that can vary from the purely deterministic to purely stochastic realm. The present analysis is conducted with an objective of gaining insight into complexity variations related to changing brain dynamics for EEG recorded from the three cases of passive, eyes closed condition, a mental arithmetic task and the same mental task carried out after a physical exertion task. It is observed that the statistic is a robust quantifier of complexity suited for short physiological signals such as the EEG and it points to the specific brain regions that exhibit lowered complexity during the mental task state as compared to a passive, relaxed state. In the case of mental tasks carried out before and after the performance of a physical exercise, the statistic can detect the variations brought in by the intermediate fatigue inducing exercise period. This enhances its utility in detecting subtle changes in the brain state that can find wider scope for applications in EEG based brain studies.
Rani, Joseph(Optical Society of America, October 29, 2001)
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Abstract:
A new polymer matrix sensitized with methylene blue for use as an optical recording material is described
here. The characterization is done to determine the optimal recording conditions. These films need no
chemical development and are found to be stable for several months. The matrix has excellent shelf life
and needs an exposure only as short as 20 s. Direct imaging was done on this material.
Biju Kumar, S; Honey, John; Rani, Joseph; Hajian,M; Ligthart, L P; Mathew, K T(Elsevier Science, 2001)
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Abstract:
Dielectric properties of polyaniline at different frequencies were studied. Cavity perturbation technique was employed for the
study. Poly aniline in the powder and pelletised forms were prepared under different environmental conditions. Different samples of
poly aniline exhibit high conductivity. However. the conductivity of samples prepared under different environmental conditions is
found to vary. All the samples in the powder form have high conductivity irrespective of the method of preparation. The high
conductivity at microwave frequency makes it possible to be used for developing microwave components like filters.
Dielectric properties of polyaniline at different frequencies were studied. Cavity perturbation technique was employed for the
study. Poly aniline in the powder and pelletised forms were prepared under different environmental conditions. Different samples of
poly aniline exhibit high conductivity. However, the conductivity of samples prepared under different environmental conditions is
found to vary. All the samples in the powder form have high conductivity irrespective of the method of preparation. The high
conductivity at microwave frequency makes it possible to be used for developing microwave components like filters.
The room temperature AC conductivity σ(ω) of amorphous AsSe samples with various compositions have been measured in the 103 -106 Hz frequency range. The results indicate that ac conductivity is proportional to n with n=0.89±.01 in the 103 –106 Hz frequency range. Consideration of different models for the frequency –dependent conductivity leads to thermally activated hopping as the most likely process
Description:
International Journal of Scientific and Research Publications, Volume 4, Issue 5, May 2014
Daleesha M Viswanathan; Dr. Sumam Mary Idicula(Cochin University of Science and Technology, August 4, 2015)
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Abstract:
Sign language is the primary means of communication for the hard to
hear and speak people around the globe. Sign language emphasizes on visual
possibilities as the participants are unable to hear sound patterns. Sign language
uses different signs, body postures and gestures as opposed to sound patterns
for communication, and evolves like any other spoken language. American
Sign Language (ASL), British sign language (BSL), Arabic sign language
(ArSL), Chinese sign language (CSL) and Indian sign language (ISL) are some
of the widely used sign language systems around the world. There exists
significant variation between sign languages, and due to these inherent
variations, it is not possible to fully adopt a methodology that is found suitable
for all. There are enormous complexities in ISL. Contrary to ASL, ISL
sentences follow Subject-Object-Verb pattern. For example, the relative
positioning of hand on face with respect to nose can convey ‘WOMAN’ or
‘THINK’ in ISL. Such complexities necessitate independent research in ISL.
Sign language recognition involves integration of different categories
of signs. The signs can be mainly categorized into three groups like static hand
gestures, dynamic gestures and facial expression. This research focuses on
these three different channels and work to identify the potential of different
computational methods to address some of the associated complexities with
each channel. These complexities include static gestures with resemblances,
static overlaid gestures, differential movement and directional changes in
dynamic gestures and facial expression changes.
We propose a novel, simple, efficient and distribution-free re-sampling technique for developing prediction intervals for returns and volatilities following ARCH/GARCH models. In particular, our key idea is to employ a Box–Jenkins linear representation of an ARCH/GARCH equation and then to adapt a sieve bootstrap procedure to the nonlinear GARCH framework. Our simulation studies indicate that the new re-sampling method provides sharp and well calibrated prediction intervals for both returns and volatilities while reducing computational costs by up to 100 times, compared to other available re-sampling techniques for ARCH/GARCH models. The proposed procedure is illustrated by an application to Yen/U.S. dollar daily exchange rate data.