Dr.Babu, C A; Jayakrishnan, P R; Sivaprasad, P(www.elsevier.com/, January 14, 2013)
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Abstract:
Atmospheric surface boundary layer parameters vary anomalously in response to the occurrence of
annular solar eclipse on 15th January 2010 over Cochin. It was the longest annular solar eclipse
occurred over South India with high intensity. As it occurred during the noon hours, it is considered to
be much more significant because of its effects in all the regions of atmosphere including ionosphere.
Since the insolation is the main driving factor responsible for the anomalous changes occurred in the
surface layer due to annular solar eclipse, occurred on 15th January 2010, that played very important
role in understanding dynamics of the atmosphere during the eclipse period because of its coincidence
with the noon time. The Sonic anemometer is able to give data of zonal, meridional and vertical wind as
well as the air temperature at a temporal resolution of 1 s. Different surface boundary layer parameters
and turbulent fluxes were computed by the application of eddy correlation technique using the high
resolution station data. The surface boundary layer parameters that are computed using the sonic
anemometer data during the period are momentum flux, sensible heat flux, turbulent kinetic energy,
frictional velocity (u*), variance of temperature, variances of u, v and w wind. In order to compare the
results, a control run has been done using the data of previous day as well as next day. It is noted that
over the specified time period of annular solar eclipse, all the above stated surface boundary layer
parameters vary anomalously when compared with the control run. From the observations we could
note that momentum flux was 0.1 Nm 2 instead of the mean value 0.2 Nm-2 when there was eclipse.
Sensible heat flux anomalously decreases to 50 Nm 2 instead of the mean value 200 Nm 2 at the time
of solar eclipse. The turbulent kinetic energy decreases to 0.2 m2s 2 from the mean value 1 m2s 2. The
frictional velocity value decreases to 0.05 ms 1 instead of the mean value 0.2 ms 1. The present study
aimed at understanding the dynamics of surface layer in response to the annular solar eclipse over a
tropical coastal station, occurred during the noon hours. Key words: annular solar eclipse, surface
boundary layer, sonic anemometer
Description:
Journal of Atmospheric and Solar-Terrestrial Physics 94 (2013) 49–53
Sindhu, K P; Dr. Rajitha Kumar, S(Cochin University Of Science And Technology, September , 2013)
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Abstract:
Unfortunately, in India it is a fact that most of the investors are not
interested in mutual funds. Those who are investing, they are investing
only very small amounts. But what is important to be noted here is that when compared to other financial instruments, investments in mutual
funds are safer and also yields more returns on the investment portfolio.
Moreover as an investment avenue mutual fund is available for those
investors who are not willing to take any exposure directly in the security
market. It also helps such investors to build their wealth over a period of
time. At the retail level, investors are unique and are highly
heterogeneous, and the mutual fund schemes' selection will also differ
depends on their expectations. Hence, investors’ expectation is a very
important factor in this regard that needs to be analysed by all the
investment houses. Hence, the factors that drive the investment decisions
of individual investors to meet their expectations by investing money in
mutual funds need an in-depth analysis. These driving forces include the
preference of investors on mutual fund compared to various available
avenues of financial investments, risk attitude of investors, influence of
characteristics of instruments of mutual funds on investors, the
investment specific attitudes of investors, and influence of qualities of
fund management on investors. The success of any mutual fund, a
popular means of investment, depends on how effectively an Asset
Management Company has been able to understand the level of influence
of these factors on the decision of investors to invest in mutual funds.
For a substantial growth in the mutual fund market, there must be a high
level precision in the design and marketing of the products of mutual
funds taking into account these driving forces by the Asset Management
Companies. Therefore, there is a need to conduct a detailed study on
investments in mutual funds in this direction. A review of available
literature also revealed that no detailed study on mutual funds has so far
been attempted in this direction; hence the present study on Driving
Forces of Investment Decisions in Mutual Funds is undertaken.
Description:
School Of Management Studies
Cochin University Of Science And Technology
Sona,Kundukulam O; Manju,Paulson; Aanandan,C K; Mohanan, P; Vasudevan, K(Microwave and Optical Technology Letters, June 5, 2000)
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Abstract:
Experimental studies on a compact dual frequency microstrip
antenna are presented. This antenna configuration provides an
area reduction of 40% compared to a standard rectangular antenna
operating at the same frequency without much degradation of the gain.
The antenna structure can be modified to achieve the desired ratio
between the two resonant frequencies
Binoy,G S; Aanandan,C K; Mohanan, P; Vasudevan, K(International Journal of Electronics, January 12, 2002)
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Abstract:
A new design of' a dual-frequency dual-polarized square microsh'ip antenna fed
along the diagonal, embedded with a square slot having three extended stubs for
frequency tuning, is introduced. The proposed antenna was fabricated using a
standard photolithographic method and the antenna was tested using the HP
3510(:; Vector Network Analyser. The antenna is capable of generating dual
resonant frequencies with mutually perpendicular polarizations and broad
radiation pattern characteristics. Such dual-frequency designs find wide
applications in personal mobile handsets combining GSM and CDS 1800 modes,
and applications in which different frequencies are used for emission and reception
such as personal satellite communications and cellular network systems.
Poulose Jacob,K; Sreela Sasi; Rekha, James K; Shahana, T K; Babita, Jose R(IEEE, May 18, 2008)
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Abstract:
The recent trends envisage multi-standard
architectures as a promising solution for the future wireless
transceivers. The computationally intensive decimation filter
plays an important role in channel selection for multi-mode
systems. An efficient reconfigurable implementation is a key to
achieve low power consumption. To this end, this paper presents
a dual-mode Residue Number System (RNS) based decimation
filter which can be programmed for WCDMA and 802.11a
standards. Decimation is done using multistage, multirate finite
impulse response (FIR) filters. These FIR filters implemented in
RNS domain offers high speed because of its carry free
operation on smaller residues in parallel channels. Also, the FIR
filters exhibit programmability to a selected standard by
reconfiguring the hardware architecture. The total area is
increased only by 33% to include WLANa compared to a single
mode WCDMA transceiver. In each mode, the unused parts of
the overall architecture is powered down and bypassed to attain
power saving. The performance of the proposed decimation
filter in terms of critical path delay and area are tabulated
Description:
Circuits and Systems, 2008. ISCAS 2008. IEEE International Symposium on
Pages
952-955
Sona,Kundukulam O; Manju,Paulson; Aanandan,C K; Mohanan, P(Microwave and Optical Technology Letters, September 20, 2002)
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Abstract:
Experimental and simulated results for a dual-port
dual-polarized microstrip antenna are presented. The antenna excites
two orthogonally polarized resonant frequencies providing an isolation
of -30 dB between the ports. The patch geometry consists of
two circular arcs of different radii with their centers displaced by a
distance. This new design offers an area reduction of -70% coinpared
to it standard rectangular microstrip antenna with a reduction
in gain of 1.7 dB
Parvathi, R; Indic, P; Nampoori, V P N(Elsevier, February 11, 2002)
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Abstract:
Nonlinear time series analysis is employed to study the complex behaviour exhibited by a coupled pair of Rossler systems. Dimensional analysis with emphasis on the topological correlation dimension and the Kolmogorov entropy of the system is carried out in the coupling parameter space. The regime of phase synchronization is identified and the extent of synchronization between the systems constituting the coupled system is quantified by the phase synchronization index. The effect of noise on the coupling between the systems is also investigated. An exhaustive study of the topological, dynamical and synchronization properties of the nonlinear system under consideration in its characteristic parameter space is attempted.
Leena,P; Dr.Babu, C A(Department of Atmospheric Science, 2000)
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Abstract:
The objective of the study is to examine the dynamic and thermodynamic structure and the variations that occur in the surface layer during the pre-monsoon, onset and post-monsoon periods over the Indian region. The variations caused during the occurrence of micro and mesoscale systems, structure and variation in the marine boundary layer over the Indian region is also investigated. The drag coefficient computed indirectly also shows variation during various seasons. The thermodynamic structure of the atmosphere shows variation during the various seasons. The onset monsoon causes lowering of the Lifting Condensation Levels. The outcome of the study is expected to provide a better understanding of the structure and variations in the boundary layer over India, which is useful for many applications especially for numerical modeling studies.
Hamza, Varikoden; Dr.Babu, C A(Department of Atmospheric Science, May , 2006)
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Abstract:
Atmospheric Boundary layer (ABL) is the layer just above the earth surface and is influenced by the surface forcing within a short period of an hour or less. In this thesis, characteristics of the boundary layer over ocean, coastal and inland areas of the atmosphere, especially over the monsoon regime are thoroughly studied. The study of the coastal zone is important due to its high vulnerability mainly due to sea breeze circulation and associated changes in the atmospheric boundary layer. The major scientific problems addressed in this thesis are diurnal and seasonal variation of coastal meteorological properties, the characteristic difference in the ABL during active and weak monsoons, features of ABL over marine environment and the variation of the boundary layer structure over an inland station.
The thesis describes the various features in the ABL associated with the active and weak monsoons and, the surface boundary layer properties associated with the active and weak epochs. The study provides knowledge on MABL and can be used as the estimated values of boundary layer parameters over the marine atmosphere and to know the values and variabilities of the ABL parameters such as surface wind, surface friction, drag coefficient, wind stress and wind stress curl.
Sunoj, S M; Linu, M N(Taylor & Francis, May 2, 2010)
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Abstract:
Recently, cumulative residual entropy (CRE) has been found to be a new measure of information that
parallels Shannon’s entropy (see Rao et al. [Cumulative residual entropy: A new measure of information,
IEEE Trans. Inform. Theory. 50(6) (2004), pp. 1220–1228] and Asadi and Zohrevand [On the dynamic
cumulative residual entropy, J. Stat. Plann. Inference 137 (2007), pp. 1931–1941]). Motivated by this finding,
in this paper, we introduce a generalized measure of it, namely cumulative residual Renyi’s entropy,
and study its properties.We also examine it in relation to some applied problems such as weighted and equilibrium
models. Finally, we extend this measure into the bivariate set-up and prove certain characterizing
relationships to identify different bivariate lifetime models
George,K E; Komalan, C; Kumar, P A S; Varughese, K T; Thomas, S(eXPRESS Polymer Letters, 2007)
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Abstract:
The dynamic mechanical properties such as storage modulus, loss modulus and damping properties of blends of
nylon copolymer (PA6,66) with ethylene propylene diene (EPDM) rubber was investigated with special reference to the
effect of blend ratio and compatibilisation over a temperature range –100°C to 150°C at different frequencies. The effect of
change in the composition of the polymer blends on tanδ was studied to understand the extent of polymer miscibility and
damping characteristics. The loss tangent curve of the blends exhibited two transition peaks, corresponding to the glass
transition temperature (Tg) of individual components indicating incompatibility of the blend systems. The morphology of
the blends has been examined by using scanning electron microscopy. The Arrhenius relationship was used to calculate the
activation energy for the glass transition of the blends. Finally, attempts have been made to compare the experimental data
with theoretical models.
Joseph, P V; Jacob,Chacko(Department of Chemical Oceanography, 2002)
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Abstract:
The proposed study is an attempt to quantify and study the seasonal and spatial variations in the distribution of Cr, Mn, Fe, Co, Ni, Cu, Zn, Cd and Pb among the various geochemical phases in the surficial sediments of Chitrapuzha river. The study also estimates the concentration of heavy metals in dissolved, particulate and sediments and their variation in seasonal and spatial distribution. Chitrapuzha River originates as a small stream from the upper reaches of high ranges in the eastern boundary of Kerala, passes through the valley and finally joints in the Cochin backwaters. Numerous industrial units located along the banks of the river discharge treated and untreated effluents into the water. These are long standing local complaints about water pollution causing fish mortality and serious damage to agricultural crops resulting in extensive unemployment in the area. The river is thus of considerable social and economic importance.
Sabu,P; Dr.Revichandran,C(Cochin University of Science & Technology, January , 2009)
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Abstract:
The present study
examines the importance of low saline waters and resulting barrier layer
in the dynamics of the ASWP using observational data.The oceanic general circulation models (OGCM) are very useful for
exploring the processes responsible for the ASWP and their variability.
The circulation and thermohaline structure stimulated by an OGCM
changes a lot when the resolution is increased from mesoscale to macro
scale. For a reasonable simulation of the ASWP, we must include the
mesoscale turbulence in numerical models. Especially the SEAS is an
eddy prominent region with a horizontal dimension of 100 to 500 km and
vertical extent of hundred meters. These eddies may have an important
role on the evolution of ASWP, which has not been explored so far.Most of the earlier studies in the SEAS showed that the heat buildup
in the mixed layer during the pre-monsoon (March-May) is primarily
driven by the surface heat flux through the ocean-atmosphere interface,
while the 3-dimensional heat budget of the ML physical processes that are
responsible for the formation of the ASWP are unknown. With this
background the present thesis also examines the relative importance of
mixed layer processes that lead to the formation of warm pool in the
SEAS.