Poulose Jacob,K; Rekha, James K; Shahana, T K; Sreela Sasi(IEEE, October 30, 2007)
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Abstract:
In recent years, reversible logic has emerged as one
of the most important approaches for power optimization
with its application in low power CMOS, quantum computing
and nanotechnology. Low power circuits implemented using
reversible logic that provides single error correction – double
error detection (SEC-DED) is proposed in this paper. The
design is done using a new 4 x 4 reversible gate called ‘HCG’
for implementing hamming error coding and detection
circuits. A parity preserving HCG (PPHCG) that preserves
the input parity at the output bits is used for achieving fault
tolerance for the hamming error coding and detection circuits.
Lethakumary,B; Sreedevi, Menon K; Aanandan,C K; Vasudevan, K; Mohanan, P(Microwave and Optical Technology Letters, November 20, 2004)
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Abstract:
A theoretical analysis of a symmetric T-shaped rnicrostripfed
rectangular microstrip antenna using the finite-difference titnedoniain
(FDTD) method is presented in this paper. The resonant frequency,
return loss, impedance bandwidth, and radiation patterns are
predicted and are in good agreement with the measured results
Poulose Jacob,K; Sonia, Sunny; David, Peter S(IEEE, August 9, 2012)
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Abstract:
Speech signals are one of the most important means
of communication among the human beings. In this paper, a
comparative study of two feature extraction techniques are
carried out for recognizing speaker independent spoken
isolated words. First one is a hybrid approach with Linear
Predictive Coding (LPC) and Artificial Neural Networks
(ANN) and the second method uses a combination of Wavelet
Packet Decomposition (WPD) and Artificial Neural Networks.
Voice signals are sampled directly from the microphone and
then they are processed using these two techniques for
extracting the features. Words from Malayalam, one of the
four major Dravidian languages of southern India are chosen
for recognition. Training, testing and pattern recognition are
performed using Artificial Neural Networks. Back propagation
method is used to train the ANN. The proposed method is
implemented for 50 speakers uttering 20 isolated words each.
Both the methods produce good recognition accuracy. But
Wavelet Packet Decomposition is found to be more suitable for
recognizing speech because of its multi-resolution
characteristics and efficient time frequency localizations
Description:
Advances in Computing and Communications (ICACC), 2012 International Conference on
Poulose Jacob,K; Supriya, M H; Liny, Varghese(International Journal of Computer Science and Communication, June , 2012)
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Abstract:
Treating e-mail filtering as a binary text classification problem, researchers have applied several statistical learning
algorithms to email corpora with promising results. This paper examines the performance of a Naive Bayes classifier
using different approaches to feature selection and tokenization on different email corpora
Description:
International Journal of Computer Science and Communication Vol. 3, No. 1, January-June 2012, pp. 81-84
Rosamma, Philip; Bright Singh, I S; Manjusha, M; Somnath Pai, S(Inter-Research, September 23, 2005)
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Abstract:
Fenneropenaeus indicus could be protected from white spot disease (WSD) caused by
white spot syndrome virus (WSSV) using a formalin-inactivated viral preparation (IVP) derived from
WSSV-infected shrimp tissue. The lowest test quantity of lyophilized IVP coated onto feed at 0.025 g–1
(dry weight) and administered at a rate of 0.035 g feed g–1 body weight d–1 for 7 consecutive days was
sufficient to provide protection from WSD for a short period (10 d after cessation of IVP administration).
Shrimp that survived challenges on the 5th and 10th days after cessation of IVP administration
survived repeated challenges although they were sometimes positive for the presence of WSSV
by a polymerase chain reaction (PCR) assay specific for WSSV. These results suggest that F. indicus
can be protected from WSD by simple oral administration of IVP
Description:
DISEASES OF AQUATIC ORGANISMS,Vol. 66: 265–270, 2005
Swapna, Nair S; Rajesh, S; Abraham, V S; Anantharaman, M R(Springer, April , 2011)
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Abstract:
Ferrofluids belonging to the series, Ni x Fe1-x Fe2O4 and Zn x Fe1-x Fe2O4, were synthesized using cold co-precipitation. Liquid films of these ferrofluids were prepared by encapsulating the ferrofluids in between two optically smooth and ultrasonically cleaned glass plates. Magnetic field induced laser transmission through these ferrofluid films has been investigated. Magnetic field values can be calibrated in terms of output laser power in the low field region in which the variation is linear. This set up can be used as a cheap optical gaussmeter in the low field regime. Using the same set-up, the saturation magnetization of the sample used can also be calculated with a sample that is pre-characterized. Hence both magnetization of the sample, as well as applied magnetic field can be sensed and calculated with a precalibrated sample.
Radhakrishnan, P; Nampoori, V P N; Vallabhan, C P G(Indian Journal of Physics, 1992)
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Abstract:
A simple fiber optic concentration sensor based on the coupling of light f rom one
fiber to another through a solution is discussed. The operational characteristics of the sensor are
illustrated by taking the solutions of potassium permanganate and fast green dye as samples.The extrinsic type sensor described here shows linearity at lower concentrations.
Rajesh, M; Geetha, K; Sheeba, M; Radhakrishnan, P; Vallabhan, C P G; Nampoori, V P N(Elsevier, May , 2006)
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Abstract:
A simple, effective and inexpensive fiber optic sensor for investigating the setting characteristics of various grades of cement is described. A finite length of unsheathed multimode optical fiber laid inside the cement mix, is subjected to stress during the setting process. The microbends created on the fiber due to this stress directly influence the intensity of light propagating through the fiber. Continuous monitoring of such variations in the light output transmitted through the fiber gives a clear measure of the setting characteristics of the cement mix, thus providing a simple and elegant technique of great practical importance in the field of civil engineering. The smart fiber optic sensor described above can be incorporated into a building during the construction process itself so that continuous monitoring of the deterioration process for the entire life time of the building can be carried out.
Radhakrishnan, P; Nampoori, V P N; Girijavallabhan, C P; Shelly John, M(Measurement Science and Technology, UK, November 12, 1998)
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Abstract:
A novel sensing technique for the in situ monitoring of the rate of pulsed laser
deposition (PLD) of metal thin films has been developed. This optical fibre based sensor
works on the principle of the evanescent wave penetration of waveguide modes into the
uncladded portion of a multimode fibre. The utility of this optical fibre sensor is
demonstrated in the case of PLD of silver thin films obtained by a Q-switched Nd:YAG laser
which is used to irradiate a silver target at the required conditions for the preparation of thin
films. This paper describes the performance and characteristics of the sensor and shows how
the device can be used as an effective tool for the monitoring of the deposition rate of silver
thin films. The fibre optic sensor is very simple, inexpensive and highly sensitive compared
with existing techniques for thin film deposition rate measurements
Nampoori, V P N; Radhakrishnan, P; Girijavallabhan, C P; Shelly John, M(Measurement Science and Technology, UK, November 12, 1998)
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Abstract:
A novel sensing technique for the in situ monitoring of the rate of pulsed laser
deposition (PLD) of metal thin films has been developed. This optical fibre based sensor
works on the principle of the evanescent wave penetration of waveguide modes into the
uncladded portion of a multimode fibre. The utility of this optical fibre sensor is
demonstrated in the case of PLD of silver thin films obtained by a Q-switched Nd:YAG laser
which is used to irradiate a silver target at the required conditions for the preparation of thin
films. This paper describes the performance and characteristics of the sensor and shows how
the device can be used as an effective tool for the monitoring of the deposition rate of silver
thin films. The fibre optic sensor is very simple, inexpensive and highly sensitive compared
with existing techniques for thin film deposition rate measurements.
Sivasankara Pillai,V N; Radhakrishnan, P; Nampoori, V P N; Girijavallabhan, C P; Suresh, Kumar P(Journal of Optics : A Pure and Applied Optics, March 8, 2002)
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Abstract:
A fibre optic technique for detecting trace amounts of nitrite compounds in
water is described. The off-line fibre optic sensor outlined here is based on
evanescent field absorption in a test solution formed by the reaction of nitrite
compounds in water with suitable chemical reagents. A short unclad portion
of a plastic clad silica fibre acts as the sensing region. The experimental
results clearly establish the usefulness of the present technique for detecting
very low concentrations of the order of 1 ppb (parts per billion) of nitrite
compounds with a large dynamic range of 1–1000 ppb. Such a high
sensitivity enables the present device to be used for measuring the nitrite
content in drinking water.
Girijavallabhan, C P; Nampoori, V P N; Radhakrishnan, P; Sheeba, M; Rajesh, M(Measurement Science and Technology, Institute of Physics Publishing, October 4, 2005)
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Abstract:
The design and development of a fibre optic evanescent wave refractometer
for the detection of trace amounts of paraffin oil and palm oil in coconut oil
is presented. This sensor is based on a side-polished plastic optical fibre. At
the sensing region, the cladding and a small portion of the core are removed
and the fibre nicely polished. The sensing region is fabricated in such a
manner that it sits perfectly within a bent mould. This bending of the
sensing region enhances its sensitivity. The oil mixture of different mix
ratios is introduced into the sensing region and we observed a sharp decrease
in the output intensity. The observed variation in the intensity is found to be
linear and the detection limit is 2% (by volume) paraffin oil/palm oil in
coconut oil. The resolution of this refractometric sensor is of the order of
10−3. Since coconut oil is consumed in large volumes as edible oil in south
India, this fibre optic sensor finds great relevance for the detection of
adulterants such as paraffin oil or palm oil which are readily miscible in
coconut oil. The advantage of this type of sensor is that it is inexpensive and
easy to set up. Another attraction of the side-polished fibre is that only a
very small amount of analyte is needed and its response time is only 7 s.
Harilal, S S; Issac, Riju C; Bindhu, C V; Nampoori, V P N; Vallabhan, C P G(Pramana, September , 1997)
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Abstract:
Time resolved optical emission spectroscopy is employed to study the expansion
dynamics of C2 species in a graphite plasma produced during the Nd : YAG ablation. At low laser
fluences a single peak distribution with low kinetic energy is observed. At higher fluences a twin
peak distribution is found. It has been noted that these double peak time of flight distribution splits
into a triple peak structure at distances >_ 17mm from the target surface. The reason for the
occurrence of multiple peak is due to different formation mechanisms of C2 species
Anantharaman, M R; Malini, K A; Swapna, Nair S; Joy, P A; Mathew, George(IOP Publishing LTD, March 2, 2007)
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Abstract:
Fine particles of cobalt ferrite were synthesized by the sol–gel method.
Subsequent heat treatment at different temperatures yielded cobalt ferrites
having different grain sizes. X-ray diffraction studies were carried out to
elucidate the structure of all the samples. Dielectric permittivity and ac
conductivity of all the samples were evaluated as a function of frequency,
temperature and grain size. The variation of permittivity and ac conductivity
with frequency reveals that the dispersion is due to Maxwell–Wagner type
interfacial polarization in general, with a noted variation from the expected
behaviour for the cold synthesized samples. High permittivity and
conductivity for small grains were explained on the basis of the correlated
barrier-hopping model
Anantharaman, M R; Asha, Mary John; Mathew, George; Swapna, Nair S; Joy, P A(Elsevier, October 10, 2005)
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Abstract:
Nanoparticles of nickel ferrite have been synthesized by the sol–gel method and the effect of grain size on its structural and magnetic
properties have been studied in detail. X-ray diffraction (XRD) studies revealed that all the samples are single phasic possessing the
inverse spinel structure. Grain size of the sol–gel synthesized powders has been determined from the XRD data and the strain graph. A
grain size of 9 nm was observed for the as prepared powders of NiFe2O4 obtained through the sol–gel method. It was also observed that
strain was induced during the firing process. Magnetization measurements have been carried out on all the samples prepared in the
present series. It was found that the specific magnetization of the nanosized NiFe2O4 powders was lower than that of the corresponding
coarse-grained counterparts and decreased with a decrease in grain size. The coercivity of the sol–gel synthesized NiFe2O4 nanoparticles
attained a maximum value when the grain size was 15nm and then decreased as the grain size was increased further.
Description:
Journal of Magnetism and Magnetic Materials 302 (2006) 190–195
Ramachandran, A; Sankar, T V(Society of Fisheries Technologists (India), 1990)
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Abstract:
The whale shark (Rhiniodon typus Smith) is an under exploited species and it is
mainly caught for its liver oil . The processing of shark fin for rays is reported here .
The fins have a high content of rays . The yield of fin rays from undried fins ranged
from 0 .53 to 4 .40 percent with maximum ray content in the lower lobe of caudal fin .
The physical and chemical characteristics of the rays are reported . The total nitrogen
content is about 15 to 16 percent (dry weight basis)
Sreekumar, Krishnapillai; Rajesh Krishnan, G(Eur. J. Org. Chem, August , 2008)
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Abstract:
This paper describes the first use of polystyrene-supported
poly(amidoamine) (PAMAM) dendrimers as heterogeneous
basic organocatalysts for carbon–carbon bond formation.
Polystyrene-supported PAMAM dendrimers of first, second
and third generations have been used as reusable base catalysts
in Knoevenagel condensations of carbonyl compounds
with active methylene compounds. The reactions proceed in short periods of time and with 100% selectivity. This novel
catalyst eliminates the use of aromatic and halogenated solvents,
as well as complex purification processes. The catalysts
can be recycled ten times.
The article examines the commodity chain trap of marine fishery in Kerala, at both material and value terms, and its
ramifications in the globalised fishery chains. The marketing chains both material and value, are very complex in
nature since they involve many types of markets and large number of intermediaries and participants. The article also
scrutinizes the sensitivity of consumers’ and country’s responses in terms of dietary and hygienic standards relating
to seafood trade. In addition, it discusses the devastating effect about the recent stipulations like the US Bio-
Terrorism Act and Shrimp anti-dumping duty on the Kerala fishery products
Chandrasekaran, M; Lakshmanaperumalsamy, P; Chandramohan, D(1985)
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Abstract:
The spoilage characteristics of bacterial strains were studied by growing them
at 28 _+ 2 °C in agar and broth media prepared with sterile fish and prawn flesh
homogenates. The percentage of spoilers found among the bacterial isolates
tested, as shown by odour production and halo zone formation, was independent
of the source of flesh used. Indole and fluorescent pigment production were
also observed in the broth. Pseudomonas, Vibrio and Acinetobacter exhibited
faster growth in flesh media than in the usual artificial media. Decrease of protein
and lipid concentration in the clear zone of agar media suggests the utilization
of the available substrate by spoilage bacteria.
Ramachandran, A; Ramesan, M P(Society of Fisheries Technologists (India), Cochin, 2008)
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Abstract:
Result of the study on traditional traps in the inland waters of three northern districts viz,
Kasargod, Kannur and Kozhikode in Kerala state during 2003-2004 is presented. Mainly six
types of traps are found in operation. Chempally koode is a rectangular bamboo trap with"
D" shape in cross section operated without bait in some rivers of Kannur and Kasargod.
Bamboo screen barriers are almost completely replaced with durable HDPE net screen to
make handling easy. Thottil vala is a unique aerial trap operated from the dam in Pazhassi reservoir during monsoon to catch big fishes jumping against flowing water.