Bindu, Krishnan; Deepthy, A; Litty, Irimpan; Dann, V J; Nampoori, V P N(Elsevier, 2006)
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Abstract:
We report enhanced back scattering in nanometer-sized ZnO colloids prepared in two different media, by different methods. The FWHM of the back scattered cone and hence the mean free path varied with concentration of ZnO as well as particle size. The Lorentzian profile of backscattered cone indicates the presence of coherence.
Nampoori, V P N; Litty, Irimpan; Dann, V J; Krishnan, B; Deepthy, A; Radhakrishnan, P(Laser Physics, 2008)
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Abstract:
Light-scattering experiments gained prominence as potential applications of quantum optics, nonlinear
optics, and photon localization. The possibility of the realization of lasing action in random media has
created much interest in the study of the coherent structure of the backscattered light from disordered media.
Backscattering (BS) studies are carried out to analyze the possibilities of photon localization in colloidal silica.
The scattering enhancement is best associated with the density of the scatterers. The width of the BS cone and,
hence, the mean-free path is related to the concentration of the medium. The dependence of the photon wavelength
on the possible characteristics of the scattering is presented.
Ajaikumar,V; Jose,K A; Aanandan,C K; Mohanan, P; K G Nair(Microwave and Optical Technology Letters, October , 1992)
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Abstract:
Reduction of radar cross -section of dihedral corner reflectors using
simulated corrugated surface (.SCS) is reported. This technique is
found lo be more effective in the reduction of RCS or corner reflectors
for normal incidence . A typical reduction of 40-50 dB is
achieved using this method
Mohanan, P; Aanandan,C K; K G Nair(Department of Electronics, October , 1992)
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Abstract:
Reduction of radar cross -section of dihedral corner reflectors using
simulated corrugated surface (SCS) is reported. The technique is
found to be more effective in the reduction of RCS or corner reflectors
for normal incidence . A typical reduction of 40-50 dB is
achieved using this method.
Hatha, A A M; Paul, M; Rao, B(Academic Press Limited, 1998)
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Abstract:
One thousand, two hundred and sixty four samples of individually quick-frozen (IQF) peeled
and deveined raw and 914 samples of cooked ready to eat shrimp samples produced from
farm raised black tiger (Penaeus monodon) obtained from a seafood unit working under
HACCP concept were analysed for total aerobic plate count (APC), coliform count, Escherichia
coli, coagulase positive Staphylococci and Salmonella. The overall bacteriological
quality of the product was found to be good. Of the frozen raw shrimp, 96% of samples
showed APC below 105 while 99% of the frozen cooked ready-to-eat samples showed APC
less than 104. The APC ranged from 1·0´102 to 4·2´106 cfu/gm in frozen raw shrimp and from
1·0´102 to 6·4´104 cfu/gm in the frozen cooked shrimp. Prevalences of coliforms in raw
shrimp and cooked shrimp samples were 14·4% and 2·9% respectively. The coliform count
in raw products ranged from 1·0´101 to 2·5´103 cfu/gm and in the cooked products, from 1·0
´101 to 1·8´102 cfu/gm. Although all the cooked shrimp samples were free of coagulase
positive staphylococci, E. coli and Salmonella, 1·0, 2·0 and 0·1% of the frozen raw shrimp
samples tested positive for coagulase positive Staphylococci, E. coli and Salmonella
respectively. The Salmonella strain was identified as Salmonella typhimurium. The results
of the present study highlight the importance of implementation of HACCP system in the
seafood industry to ensure consistent quality of frozen seafood
Chandrasekaran, M; Krishna, C(Springer, May 9, 1996)
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Abstract:
Bacillus subtilis CBTK 106, isolated from
banana wastes, produced high titres of a-amylase when
banana fruit stalk was used as substrate in a solid-state
fermentation system. The e¤ects of initial moisture content,
particle size, cooking time and temperature, pH,
incubation temperature, additional nutrients, inoculum
size and incubation period on the production of a-
amylase were characterised. A maximum yield of
5 345 000 U mg~1 min~1 was recorded when pretreated
banana fruit stalk (autoclaved at 121 ¡C for
60 min) was used as substrate with 70% initial moisture
content, 400 lm particle size, an initial pH of 7.0, a temperature
of 35 ¡C, and additional nutrients (ammonium
sulphate/sodium nitrate at 1.0%, beef extract/peptone
at 0.5%, glucose/sucrose/starch/maltose at 0.1% and
potassium chloride/sodium chloride at 1.0%) in the
medium, with an inoculum-to-substrate ratio of 10%
(v/w) for 24 h. The enzyme yield was 2.65-fold higher
with banana fruit stalk medium compared to wheat bran
Zakkariya, K A; Nishanth, P(Abhinav Publication, May , 2014)
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Abstract:
Worldwide, Micro, Small and Medium Enterprises (MSMEs) have been accepted as an engine of economic growth and for promoting equitable development. In developing countries including India, Micro, Small and Medium Enterprises sector constitute an important part in its development. In spite of this importance, this sector face number of constraints like absence of adequate and timely supply of bank finance, difficulties in procuring raw materials, marketing and distribution challenges and non availability of suitable technology. Review of literature found that there exists problem in accessing finance from banks and financial institutions and this problem may differ from region to region, between sectors, or between individual enterprises within a sector. This paper tries to identify the various barriers faced by these units in raising finance and also try to identify the various sources of finance other than banks. The study is based upon the primary data collected from the 200 MSMEs owners in Kozhikode District of Kerala. The data has been analysed with the help of percentage. The study attempts to submit some recommendations to enhance the overall credit accessibility to MSMEs sector
Description:
Abhinav National Monthly Refereed Journal of Research in
Commerce & Management,Volume 3, Issue 5 (May, 2014)
Jagathy Raj, V P; Prasanth, Poduval S; Pramod, V R(May , 2013)
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Abstract:
This paper aims to highlight the difficulties faced by organizations in implementing Total Productive Maintenance (TPM). The authors with their experience in TPM and the refinery industry have attempted to understand the factors that hinder implementation of TPM. The paper first explains in brief the concepts of TPM and why TPM is a must for organizations in this complex dynamic business environment. It then takes up the various issues that hamper implementation of TPM in industries. Solutions to overcome the barriers are discussed briefly but will be taken up in detail in another paper with specific reference to refinery scenario
Description:
INTERNATIONAL JOURNAL OF SCIENTIFIC & TECHNOLOGY RESEARCH VOLUME 2, ISSUE 5, MAY 2013
Sugunan, S; Sherly, K B(Indian Journal of Chemistry, August , 1993)
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Abstract:
The electron donating properties of La2O3 activated at 300, 500 and 800·C and its mixed oxides with
alumina are reported from the studies on adsorption of electron acceptors of varying electron affinity on
La203. The electron acceptors with their electron affinity values given in parenthesis are:
7,7,8,8-tetracyanoquinodimethane (2.84 eV), 2,3,5,6-tetrachloro-I,4-benzoquinone (2.40 eV) and
p-dinitrobenzene(l.77eV). The basicity of the oxide has been determined by titration with n-butylamine and
Ho.max values are reported. The limit of electron transfer from the oxide to the electron acceptor is between
2.40 and 1.77 eV. It is observed that La203 promotes the surface electron properties of alumina without
changing its limit of electron transfer.
A new microwave dielectric resonator Ba(Tb1/2Nb1/2)03 has been prepared and characterized in the microwave frequency region. 1 wt% CeO2 is used as additive to reduce the sintering temperature. The sintered samples were characterized by XRD, SEM and Raman spectroscopic methods. Microwave DR properties such as er, Q factor and temperature-coefficient of resonant frequency (Ti) have been measured using a HP 8510 B Network Analyzer. Cylindrical DRs of Ba(Tb1/2Nbi/2)03 showed high Er (~ 37), high Q (~3,200) and low Tf (~10 ppm /°C) at 4 GHz and hence are useful for practical applications
Jeevanand, E S; Dr.Unnikrishnan Nair, N(December 20, 1993)
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Abstract:
This thesis Entitled Bayesian inference in Exponential and pareto populations in the presence of outliers. The main theme of the present thesis is focussed on various estimation problems using the Bayesian appraoch, falling under the general category of accommodation procedures for analysing Pareto data containing outlier. In Chapter II. the problem of estimation of parameters in the classical Pareto distribution specified by the density function. In Chapter IV. we discuss the estimation of
(1.19) when the sample contain a known number of outliers under three different data generating mechanisms, viz. the exchangeable model. Chapter V the prediction of a future observation based on a random sample that contains one contaminant. Chapter VI is devoted to the study of estimation
problems concerning the exponential parameters under a k-outlier model.
Description:
Department of
Mathematics and Statistics, Cochin University of Science
and Technoloy
James, Kurian; Dr.Saseendran Pillai,P R(Cochin University of Science & Technology, October , 2008)
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Abstract:
ACCURATE sensing of vehicle position and attitude is still a very challenging
problem in many mobile robot applications. The mobile robot vehicle applications
must have some means of estimating where they are and in which direction they are
heading. Many existing indoor positioning systems are limited in workspace and
robustness because they require clear lines-of-sight or do not provide absolute, driftfree
measurements.The research work presented in this dissertation provides a new approach to
position and attitude sensing system designed specifically to meet the challenges of
operation in a realistic, cluttered indoor environment, such as that of an office
building, hospital, industrial or warehouse. This is accomplished by an innovative
assembly of infrared LED source that restricts the spreading of the light intensity
distribution confined to a sheet of light and is encoded with localization and traffic
information. This Digital Infrared Sheet of Light Beacon (DISLiB) developed for
mobile robot is a high resolution absolute localization system which is simple, fast,
accurate and robust, without much of computational burden or significant processing.
Most of the available beacon's performance in corridors and narrow passages are not
satisfactory, whereas the performance of DISLiB is very encouraging in such
situations. This research overcomes most of the inherent limitations of existing
systems.The work further examines the odometric localization errors caused by over
count readings of an optical encoder based odometric system in a mobile robot due to
wheel-slippage and terrain irregularities. A simple and efficient method is investigated and realized using an FPGA for reducing the errors. The detection and correction is
based on redundant encoder measurements. The method suggested relies on the fact
that the wheel slippage or terrain irregularities cause more count readings from the
encoder than what corresponds to the actual distance travelled by the vehicle.The application of encoded Digital Infrared Sheet of Light Beacon (DISLiB)
system can be extended to intelligent control of the public transportation system. The
system is capable of receiving traffic status input through a GSM (Global System
Mobile) modem. The vehicles have infrared receivers and processors capable of
decoding the information, and generating the audio and video messages to assist the
driver. The thesis further examines the usefulness of the technique to assist the
movement of differently-able (blind) persons in indoor or outdoor premises of his
residence.The work addressed in this thesis suggests a new way forward in the
development of autonomous robotics and guidance systems. However, this work can
be easily extended to many other challenging domains, as well.
Description:
Department of Electronics,
Cochin University of Science and Technology
Mathew, K T; Dr.Gopalakrishnan Nair, K(Cochin University of Science And Technology, May , 1978)
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Abstract:
In the present thesis, possibility of beam shaping of sectoral horns and corner reflector systems'has been studied in detail. The experimental results obtained in the above two cases are compared. As far as the flanged sectoral horns are concerned, the special advantage is that the gain is increased without impairing impedance conditions. An intense study on corner reflector antennas shows that the been broadening or focussing will be possible by adjusting parameters
involved. Beam tilting by imposing asymmetries is another interesting property of the systems. A comprehensive study of these fields has been presented in Chapter II. Chapter III is exclusively for describing the experimental techniques used in the present investigation.
In Chapter IV, experimental results on flanged sectoral horns and corner reflector eyetses are presented. A comparative analysis of the experimental results obtained with flanged sectoral horns and corner reflector systems is presented in the Chapter V. The similarity and close resemblance in each aspects are shown by presenting typical results from these two eysteee.
Theoretical aspects of both types of antennas are considered in Chapter VI. Attempts are made for co-ordinating the theoretical aspects and drawing a final conclusion. In Chapter VII. the final conclusion that the flanged sectoral horn may be considered as a corner reflector system has been drawn. The importance of the conclusions and usefulness are pointed out. The scope for further
work in these lines has been indicated.
Description:
Department of physics, Cochin University of Science And Technology