Poulose Jacob,K; ; Preetha, K G; Unnikrishnan, A(International Journal of Advanced Research in Computer and Communication Engineering, June , 2013)
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Abstract:
With the increasing popularity of wireless network and its application, mobile ad-hoc networks (MANETS)
emerged recently. MANET topology is highly dynamic in nature and nodes are highly mobile so that the rate of link failure
is more in MANET. There is no central control over the nodes and the control is distributed among nodes and they can act
as either router or source. MANTEs have been considered as isolated stand-alone network. Node can add or remove at any
time and it is not infrastructure dependent. So at any time at any where the network can setup and a trouble free
communication is possible. Due to more chances of link failures, collisions and transmission errors in MANET, the
maintenance of network became costly. As per the study more frequent link failures became an important aspect of
diminishing the performance of the network and also it is not predictable. The main objective of this paper is to study the
route instability in AODV protocol and suggest a solution for improvement. This paper proposes a new approach to reduce
the route failure by storing the alternate route in the intermediate nodes. In this algorithm intermediate nodes are also
involved in the route discovery process. This reduces the route establishment overhead as well as the time to find the
reroute when a link failure occurs.
Description:
International Journal of Advanced Research in Computer and Communication Engineering
Vol. 2, Issue 6, June 2013
Ponnachan,P T C; Paulose,C S; Panikkar,K R(Department of Biotechnology, 1991)
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Abstract:
Alloxan induced diabetic animal model was
sed to evaluate the potential antidiabetic effect of
ie aqueous leaf extract of Aegle marmelose. Insuinjection
and oral treatment of Aegle marmelose
of extract to the alloxan induced rats maintained
;e animal weight near to the control rats whereas
,,ere was a significant decrease in weight in alloxan
•duced rats. Insulin injection and oral treatment
the leaf extract reversed the decrease of protein
)ntent in all the organs studied except the pancas.
Glucose level was maintained near to the co-
:rol levels in the insulin injected and leaf extract
Bated alloxan diabetic rats. A significant increased
ucose tolerance was observed in animals orally
ven the leaf extract prior to the experiment. The
suits indicate that there is an increased utilization
glucose in the Aegle marmelose leaf extract treed
rats.
Manu P, John; Jijo, P U; Nandakumaran, V M(Indian Academy of Sciences, March , 2009)
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Abstract:
We study the effect of parameter fluctuations and the resultant multiplicative
noise on the synchronization of coupled chaotic systems. We introduce a new quantity,
the fluctuation rate Ф as the number of perturbations occurring to the parameter in unit
time. It is shown that ϕ is the most significant quantity that determines the quality of
synchronization. It is found that parameter fluctuations with high fluctuation rates do not
destroy synchronization, irrespective of the statistical features of the fluctuations. We also
present a quasi-analytic explanation to the relation between ϕ and the error in synchrony.
Sony, George; Ajai, Kumar; Singh, R K; Nampoori, V P N(Springer, 2010)
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Abstract:
A study has been carried out to understand the
influence of ambient gases on the dynamics of laser-blow-off
plumes of multi-layered LiF–C thin film. Plume images
at various time intervals ranging from 100 to 3000 ns have
been recorded using an intensified CCD camera. Enhancement
in the plume intensity and change in size and shape
occurs on introducing ambient gases and these changes are
highly dependent on the nature and composition of the ambient
gas used. Velocity of the plume was found to be
higher in helium ambient whereas intensity enhancement is
greater in argon environment. The plume shapes have maximum
size at 10−2 and 10−1 Torr of Ar and He pressures,
respectively. As the background pressure increases further
(>10−2 Torr: depending on the nature of gas), the plume
gets compressed/focused in the lateral direction. Internal
structure formation and turbulences are observed at higher
pressures (>10−1 Torr) in both ambient gases.
Sarita,G Bhat; Anna Dilfi, K Francis; Zeena, Hamza P; Thomas, Kurian(Taylor & Francis, May 20, 2009)
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Abstract:
Low-density polyethylene was mixed with dextrin having
different particle sizes (100, 200 and 300 mesh). Various compositions
were prepared and their mechanical properties were evaluated
and thermal studies have been carried out. Biodegradability of these
samples has been checked using liquid culture medium containing
Vibrios (an amylase producing bacteria), which were isolated from
marine benthic environment. Soil burial test was done and reprocessability
of these samples was evaluated. The results indicate that the
newly prepared blends are reprocessable without sacrificing much of
their mechanical properties. The biodegradability tests on these
blends indicate that these are partially biodegradable
Description:
Polymer-Plastics Technology and Engineering, 48: 602–606, 2009
Litty, Irimpan; Ambika, D; Kumar, V; Nampoori, V P N; Radhakrishnan, P(American Institute of Physics, 2008)
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Abstract:
The annealing effect on the spectral and nonlinear optical NLO characteristics of ZnO thin films
deposited on quartz substrates by sol-gel process is investigated. As the annealing temperature
increases from 300–1050 °C, there is a decrease in the band gap, which indicates the changes of the
interface of ZnO. ZnO is reported to show two emission bands, an ultraviolet UV emission band
and another in the green region. The intensity of the UV peak remains the same while the intensity
of the visible peak increases with increase in annealing temperature. The role of oxygen in ZnO thin
films during the annealing process is important to the change in optical properties. The mechanism
of the luminescence suggests that UV luminescence of ZnO thin films is related to the transition
from conduction band edge to valence band, and green luminescence is caused by the transition
from deep donor level to valence band due to oxygen vacancies. The NLO response of these
samples is studied using nanosecond laser pulses at off-resonance wavelengths. The nonlinear
absorption coefficient increases from 2.9 ×10−6 to 1.0 ×10−4 m/W when the annealing temperature
is increased from 300 to 1050 °C, mainly due to the enhancement of interfacial state and exciton
oscillator strength. The third order optical susceptibility x(3) increases with increase in annealing
temperature (T) within the range of our investigations. In the weak confinement regime, T2.4
dependence of x(3) is obtained for ZnO thin films. The role of annealing temperature on the optical
limiting response is also studied.
Anantharaman, M R; Al-Omari, I A(Scientific Research Publishing, May 25, 2012)
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Abstract:
The results of the investigation of the magnetic and structural properties of the alloy system Fe0.75–xSi0.25Sbx, where x = 0, 0.05, 0.1, 0.15, 0.2, and 0.25 synthesized by mechanical alloying followed by heat treatment are described. The x-ray diffraction reveals that all samples crystallize in the DO3-type cubic phase structure. Substituting Fe by Sb led to a de-crease in the lattice constant and the unit cell volume. The magnetic properties are investigated by vibrating sample magnetometer and show that all the samples are ferromagnetically ordered at room temperature. The Curie temperature is found to decrease linearly from (850 ± 5) K for the parent alloy to (620 ± 5) K for the alloyith x = 0.25. The satura-tion magnetizations at room temperature and at 100 K are found to decrease with increasing the antimony concentration. The above results indicate that Sb dissolves in the cubic structure of this alloy system.
Description:
World Journal of Condensed Matter Physics, 2012, 2, 61-65
Cashew kernels have high
nutritive value. Upon exposure
to air kernels turn rancid and
their nutritive value decreases.
From this study it is concluded
that chemical treatment using
antioxidants reduced oxidative
rancidity but failed to prevent
deterioration in organoleptic
characteristics and decrease in
protein and carbohydrate
content of stored kernels.
Rani, Joseph(Hutig & Wepf Verlag,Basel, October 5, 1987)
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Abstract:
Compounding of styrene-butadiene copolymer/polybutadiene , natural rubber/
ethylene-propylene-diene terpolymer and natural rubber/butadiene-acrylonitrile copolymer
blends was done in three different ways and their curing behaviour and the
tensile properties of the es are compared.
Anantharaman, M R; Soloman, M A; Philip, Kurian; Joy, P A(Wiley Periodicals, September 26, 2002)
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Abstract:
Fine particles of barium ferrite (BaFe12O19)
were synthesized by the conventional ceramic technique.
These materials were then characterized by the X-ray diffraction
method and incorporated in the natural rubber matrix
according to a specific receipe for various loadings of
ferrite. The rubber ferrite composites (RFC) thus obtained
have several applications, and have the advantage of molding
into complex shapes. For applications such as microwave
absorbers, these composites should have an appropriate
dielectric strength with the required mechanical and
magnetic properties. The N330 (HAF) carbon black has been
added to these RFCs for various loadings to modify the
dielectric and mechanical properties. In this article we report
the effect of carbon black on the mechanical and dielectric
properties of these RFCs. Both the mechanical and dielectric
properties can be enhanced by the addition of an appropriate
amount of carbon black
Description:
Journal of Applied Polymer Science, Vol. 89, 769–778 (2003)
James, Joseph; Ananthakrishnan, T R; Nampoori, V P N; Rudra Warier, M K; Karanjikar, N P; Kamat, M J(World Scientific Publishing Company, 1995)
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Abstract:
The effect of Ce3+ on the fluorescence emission from CaS:Ce3+ phosphor is studied using X-ray excitation. Apart from the emission in the visible region, the phosphor also shows fluorescence emission in the ultraviolet region. Variation in wavelengths and intensities of these emissions due to change in dopant concentration is also analysed.
Pillai, S M; Vallabhan, C P G(Solid State Communications, 1983)
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Abstract:
ZnS: Cu: Cl phosphor prepared under a vacuum firing process is found to
give blue electroluminescence with emission peak at 460 nm which remams
unaltered with the frequency of the excitation voltage. Addition of excess
chlorine in the phosphor gives blue, green and red emission at 460, 520
and 640 run. The intensity of the blue band decreases and It fmally
disappears as chlorine concentration is increased. A scheme involving
three energy levels attributed to Cu2+, Cu+ and Cl- centres in Zns
explains the experimental results completely.
The effect of chromium doping on methylene
blue sensitized Poly (vinyl alcohol)/Acrylamide was carried
out by varying the ratios of Ammonium dichromate
and methylene blue. In the case of films without ammonium
dichromate, the diffraction efficiency was found to
decrease on storage. On chromium doping the storage life
was improved. Interestingly, a self-enhancement in efficiency
was observed for a particular ratio of methylene
blue and ammonium dichromate.
Anantharaman, M R; Swapna, Nair S; Mercy, Mathews; Joy, P A; Kulkarni, S D(Elsevier, July 26, 2004)
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Abstract:
Superparamagnetic nanocomposites based on g-Fe2O3 and sulphonated polystyrene have been synthesized by ion
exchange process and the preparation conditions were optimized. Samples were subjected to cycling to study the effect
of cycling on the magnetic properties of these composites. The structural and magnetization studies have been carried
out. Magnetization studies show the dependence of magnetization on the number of ion exchange cycles. Doping of
cobalt at the range in to the g-Fe2O3 lattice was effected in situ and the doping was varied in the atomic percentage
range 1–10. The exact amount of cobalt dopant as well as the iron content was estimated by Atomic Absorption
Spectroscopy. The effect of cobalt in modifying the properties of the composites was then studied and the results
indicate that the coercivity can be tuned by the amount of cobalt in the composites. The tuning of both the
magnetization and the coercivity can be achieved by a combination of cycling of ion exchange and the incorporation of
cobalt
Description:
Journal of Magnetism and Magnetic Materials 283 (2004) 344–352
Sudha Kartha, C; Nimmi, K P; Sreekumar, K; Rani, Joseph; Pramitha, V(Wiley Online Library, January 7, 2012)
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Abstract:
Holographic grating with good storage
life in poly(vinyl alcohol) based photopolymer film, prepared
by gravity settling method, with reduced concentration
of the dye was found to give good diffraction
efficiency without crosslinking. The material was found
to show good diffraction efficiency and sensitivity (75%
diffraction efficiency at exposure energy of 80 mJ/cm2).
The shelf life of the photopolymer solution could be
improved by storage at a temperature 4 C in refrigerator
Description:
Journal of Applied Polymer Science, Vol. 125, 1238–1243 (2012)
Isora fibre-reinforced natural rubber (NR) composites were cured at 80, 100, 120 and
150°C using a low temperature curing accelerator system. Composites were also prepared using a
conventional accelerator system and cured at 150°C. The swelling behavior of these composites at
varying fibre loadings was studied in toluene and hexane. Results show that the uptake of solvent
and volume fraction of rubber due to swelling was lower for the low temperature cured vulcanizates
which is an indication of the better fibre/rubber adhesion. The uptake of aromatic solvent was higher
than that of aliphatic solvent, for all the composites. As the fibre content increased, the solvent
uptake decreased, due to the superior solvent resistance of the fibre and good fibre-rubber interactions.
The bonding agent improved the swelling resistance of the composites due to the strong interfacial
adhesion. Due to the improved adhesion between the fibre and rubber, the ratio of the change in
volume fraction of rubber due to swelling to the volume fraction of rubber in the dry sample (V,) was
found to decrease in the presence of bonding agent. At a fixed fibre loading, the alkali treated fibre
composite showed a lower percentage swelling than untreated one for both systems showing superior
rubber-fibre interactions.
Anantharaman, M R; Malini, K A; Sindhu, S; Chinnasamy, C N; Ponpadian, N; Narayanasamy, A; Balachandran, M; Sivasankara Pillai,V N(Kluwer Academic Publishers, February 1, 2001)
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Abstract:
Magnetic nanocomposites containing iron oxide particles embedded in a polymer matrix
have been synthesized using the method of ion exchange. They have been characterized by
using low temperature and room temperature magnetic measurements and Mo¨ ssbauer
spectroscopy. The iron content in these samples has also been determined. The results
have been analysed and explained. The physical and chemical properties of these
nanocomposite materials are different from those of the bulk. Some of the unique
properties of these materials find application in information storage, color imaging,
ferrofluids and magnetic refrigeration
Ramachandran, A; Rajendra, Badonia; Viswanathan Nair, P G(Society of fisheries Technologists (India), 1990)
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Abstract:
Effect of delayed icing on the microbial quality and shelf-life of Hilsa toll was studied
. Fish iced in rigor condition had a shelf-life of 11 days irrespective of the state
of rigor . Fish procured from the landing centre had a shelf-life of only 8 days . It
showed the presence of coagulase positive staphylococci, faecal streptococci and E. coli.
Total bacterial count was low in all the samples and it increased after spoilage
Measurements of dc conductivity and dielectric constant show that deuteration causes an upward shift of the high temperature phase transition point from 186.5 to 191°C and a downward shift of the low temperature transition point from 10 to -1.5°C in LiNH4SO4. Mechanisms of phase transitions and of electrical transport in the crystal are discussed.