Ramachandran, A; Sankar, T V(Society of Fisheries Technologists (India), 2001)
[+]
[-]
Abstract:
Total biochemical composition of freshwater major carps, Labeo rohita -(r9hu); Catla catla
(catla); Cirrltinus tnrigala (mrigal), in relation to size was evaluated . The water soluble
nitrogen fraction constituted about 21% of the tota l nitro gen . Salt so luble fraction
constituted 55 - 60% of the total nitrogen. Non-protein nitrogen represented 12% of the
total nit rogen in all the cases except mri gal of small size (9.36%). The insoluble connec tive
tissu e contributed to 2-3 per cent of tota l nitrogen . The monounsaturated fatty acid s (MUFA)
formed 31-39% of the total fatty acids and 60-68% of the MUFA in freshwat er carps was
CI 8:1. The esse ntial amino acids contributed to 41 to 51% of the total amino acid s in
freshwater major carps. Arom atic amino acid content was sligh tly higher compared to
marine fishe s while the proportion of proline was less. Varia tions in compos ition in rela tion
to size are discu ssed . The autolytic activi ty was significantly higher in small fish in all
the three species
The changes occuring to cashew
kernels during storage at two humidity
levels - 80% to 20% with respect
to organoleptic characteristics,
protein content, carbohydrate content,
oil content, iodine and peroxide
values were studied. From the
present study it is concluded that
organoleptic characteristics of
cashew kernels deteriorates with increase
in humidity. Decrease in protein
and carbohydrate content of
stored cashew kernel is dependent
on humidity. Humidity increased
oxidative rancidification.
The development of computer and network technology is changing the education scenario and transforming the teaching and learning process from the traditional physical environment to the digital environment. It is now possible to access vast amount of information online and enable one to one communication without the confines of place or time. While E-learning and teaching is unlikely to replace face-to-face training and education it is becoming an additional delivery method, providing new learning opportunities to many users. It is also causing an impact on library services as the increased use of ICT and web based learning technologies have paved the way for providing new ICT based services and resources to the users. Online learning has a crucial role in user education, information literacy programmes and in training the library professionals. It can help students become active learners, and libraries will have to play a greater role in this process of transformation. The significance of libraries within an institution has improved due to the fact that academic libraries and information services are now responsible for e-learning within their organization.
Description:
KLA Seminar on library and webtools for E-Learning and teaching,25 june 2012,Kerala Agricultural University
In Wireless Sensor Networks (WSN), neglecting the
effects of varying channel quality can lead to an
unnecessary wastage of precious battery resources and in
turn can result in the rapid depletion of sensor energy and
the partitioning of the network. Fairness is a critical issue
when accessing a shared wireless channel and fair
scheduling must be employed to provide the proper flow
of information in a WSN. In this paper, we develop a
channel adaptive MAC protocol with a traffic-aware
dynamic power management algorithm for efficient packet
scheduling and queuing in a sensor network, with time
varying characteristics of the wireless channel also taken
into consideration. The proposed protocol calculates a
combined weight value based on the channel state and link
quality. Then transmission is allowed only for those nodes
with weights greater than a minimum quality threshold
and nodes attempting to access the wireless medium with a
low weight will be allowed to transmit only when their
weight becomes high. This results in many poor quality
nodes being deprived of transmission for a considerable
amount of time. To avoid the buffer overflow and to
achieve fairness for the poor quality nodes, we design a
Load prediction algorithm. We also design a traffic aware
dynamic power management scheme to minimize the
energy consumption by continuously turning off the radio
interface of all the unnecessary nodes that are not included
in the routing path. By Simulation results, we show that
our proposed protocol achieves a higher throughput and
fairness besides reducing the delay
Description:
IJCSNS International Journal of Computer Science and Network Security, VOL.10 No.7, July 2010
This paper is a review of the work done on the dynamics of modulated logistic systems.
Three different problems are treated, viz, the modulated logistic map, the parametrically perturbed
logistic map and the combination map obtained by combining two maps of the quadratic family.
Many of the interesting features displayed by these systems are discussed.
Nandakumaran, V M; Bindu M, Krishna; Manu P, John(Cochin University of Science & Technology, 2004)
[+]
[-]
Abstract:
Chaotic dynamics of directly modulated semiconductor lasers have been
studied extensively over the last two decades because of their application in secure
optical communication. However, chaos is generally suppressed in such systems when
the nonlinear gain reduction factor is above 0.01 which is very much smaller than
the reported values in semiconductors like InGaAsP. In this paper we show that by
giving an optoelectronic feedback with appropriate delay one can increase the range
of the values of the gain reduction factor for which chaos can be observed. Numerical
studies show that negative feedback is more efficient in producing chaotic dynamics.
Hatha, A A M; Mujeeb Rahiman, K M; Krishnan, K P; Saramma, A V; Saritha, G; Deepu lal(Indian Journal Of Geo Marine Sciences, August , 2013)
[+]
[-]
Abstract:
A total of 34 yeast isolates were characterized from 4 water samples collected from Kongsfjord at Ny Alseund region of Norwegion Artic during the Indian Artic summer expedition of 2009.They were studied for the effect of tempereture and salt concentration on growth as well as for their ability to produce various hydrolytic enzymes at two different temperatures. Result showed that 5 out of 8 genera were common to all the stations. Cryptococcus was the predominant genera folowed by Trichosporan and Rhodotorula 82% of the yeast isolates were oxidative in nature and except filobasidium all the isolates used nitrate as a nitrogen source for growth. Yeast isolates from all the ststions showed growth at 4 and 20 degree centigarade. These temperatures were chosen as most of the bacterial and yeast isolates showed psychrotrop[hic nature. 94% of the yeast isolates showed growth at 2.0M and lipolytic activity were marginally less than 4.None of the isolates produced amylase enzymes when incubated at 4 and 20. The present study highlights the wide tolerence of the psychrotrophic yeast isolates to temperature and salinity as well as their potential in biotechnology
Description:
Indian Journal of Geo-marine sciences,Vol 42(4),august 2013,pp.458-465
Zeena, Ravi P; Dr.Chandramohanakumar, N(Cochin University of Science & Technology, May , 2005)
[+]
[-]
Abstract:
Mangrove swamps are unique inter-tidal wetland ecosystems found in sheltered tropical and subtropical shores.Mangrove sediments can be considered as large reservoirs of amino acids,which exist in several different forms,like free amino acids in the sediment micropores,as amino acids,peptides or proteins bound to clay minerals or as amino acids,peptides or proteins bound to humic colloids.Inorder to assess survival conditions of organisms of mangroves,it is important to understand stability of amino acids in the sediments.The amounts of amino acids present in sediment represent a balance between its synthesis and destruction by microorganisms.Thus amino acid analysis offers more insight into the processes of diagenesis,which changes the nature and characteristics of organic matter deposition and decomposition.
Description:
Department of Chemical
Oceanography Cochin University of Science
and Technology
Iron and mixed iron aluminium pillared montrnorillonites prepared by partial hydrolysis method were subjected to room temperature
exchange with transition metals of the first series. The resulting materials were characterised by different spectroscopic techniques
and surface area measurements. About 1-3% transition metals were incorporated into the porous network. The structural
stability of the porous network was not affected by exchange. XRD and AI NMR spectroscopy evidenced the presence of iron
substituted Al13 like polymers in FeAl pillared systems. Acidity and basicity benefited much as a result of metal exchange. Acidity
and basicity were quantified by model reactions, viz., cumene cracking and cyclohexanol decomposition respectively. The presence
of basic sites in otherwise acidic pillared clays, though diminutive in amount can be of much importance in acid base catalysed
reactions.
Manoj,R; Jayaraj, M K(Department of Physics, October , 2006)
[+]
[-]
Abstract:
Materials exhibiting transparency and electrical conductivity simultaneously,
transparent conductors, Transparent conducting oxides (TCOs), which have
high transparency through the visible spectrum and high electrical
conductivity are already being used in numerous applications. Low-emission
windows that allow visible light through while reflecting the infrared, this
keeps the heat out in summer, or the heat in, in winter. A thin conducting
layer on or in between the glass panes achieves this. Low-emission windows
use mostly F-doped SnO2. Most of these TCO’s are n type semiconductors
and are utilized in a variety of commercial applications, such as flat-panel
displays, photovoltaic devices, and electrochromic windows, in which they
serve as transparent electrodes. Novel functions may be integrated into the
materials since oxides have a variety of elements and crystal structures,
providing great potential for realizing a diverse range of active functions.
However, the application of TCOs has been restricted to transparent
electrodes, notwithstanding the fact that TCOs are n-type semiconductors.
The primary reason is the lack of p-type TCOs, because many of the active
functions in semiconductors originate from the nature of the pn-junction. In
1997, H. Kawazoe et al.[2] reported CuAlO2 thin films as a first p-type TCO
along with a chemical design concept for the exploration of other p-type
TCOs.
Understanding of the Atmospheric Boundary Layer (ABL) is imperative in the arena of the monsoon field. Here, the
features of the ABL are studied employing Conserved Variable Analysis (CVA) using equivalent potential temperature
and humidity. In addition, virtual potential temperature and wind are used during active and weak phases of
monsoon. The analysis is carried out utilising the radiosonde observations during the monsoon months for two stations
situated in the west coast of India. All these parameters show considerable variations during active and weak monsoon
phases in both the stations. The core speed and core height vary with these epochs. The core speed is found to be more
than 38 knots in the active monsoon phase around 1.2 km over Trivandrum and around 2 km over Mangalore. But
during weak monsoon phase the core wind speed is decreased and core height is elevated over both stations. The wind
direction shows an additional along shore component during weak monsoon period. The Convective Boundary Layer
(CBL) height shows increase during weak monsoon phase over both stations due to less cloudiness and subsequent
insolation. The CBL height during the southwest monsoon is more over Mangalore and is attributed by the orographic
lifting in the windward side of the Western Ghats while the influence of the Ghats is less over Trivandrum.
Sivaprasad, P.; Prof. (Dr). C. A. Babu(Cochin University of Science and Technology, May 3, 2015)
[+]
[-]
Abstract:
The aerosols in the atmosphere play major role in the radiation balance of the Earthatmosphere
system. Direct and indirect impact of aerosols on the weather and climate still
remains as a topic to be investigated in detail. The effect of aerosols on the radiation budget and
thereby circulation pattern is important and requires further study. A detailed analysis of the
aerosol properties, their variability and meteorological processes that affect the aerosol
properties and distribution over the Indian region is performed in the thesis. The doctoral thesis
entitled “Characteristics of aerosols over the Indian region and their variability associated
with atmospheric conditions” contains 7 chapters. This thesis presents results on the analysis
on the distribution (spatial and temporal) and characteristics of the aerosols over the Indian
region and adjoining seas. Regional and stationwise data were analysed and methods such as
modeling and statistical analysis are implemented to understand the aerosol properties,
classification and transportation.
Chapter-1 presents a brief introduction on the aerosols, their measurement techniques,
impact of aerosols on the atmospheric radiation budget, climatic and geographic features of the
study area and the literature review on the previous studies. It provides a basic understanding in
the field of study and objective of the thesis. Definition of the aerosols, their sources/sinks and
classification of the particles according to optical and microphysical properties are described.
Different measurement techniques such as sampling and remote sensing methods are explained
in detail. Physical parameters used to describe aerosol properties and effect of aerosols on the
radiation distribution are also discussed. The chapter also explains the objectives of the thesis
and description of climatic features of the study area.
Mridula, S; Sreedevi, Menon K; Mohanan,K; Bijumon, P V(Microwave and Optical Technology Letters, February 20, 2004)
[+]
[-]
Abstract:
The radiation characteristics of a microstrip-line-excited rectangular dielectric resonator antenna (DRA) are studied experimentally.The radiation charactristics and excitation of different modes are highly influenced by the orientation of the DR,feed line parameters ,and finite size of the ground plane
Dr.Babu, C A; Neema,C P; Hareeshkumar, P V(Springer-Verlag 2011, August 9, 2011)
[+]
[-]
Abstract:
Arabian Sea Mini Warm Pool (ASMWP) is a
part of the Indian Ocean Warm Pool and formed in the
eastern Arabian Sea prior to the onset of the summer
monsoon season. This warm pool attained its maximum
intensity during the pre-monsoon season and dissipated
with the commencement of summer monsoon. The main
focus of the present work was on the triggering of the
dissipation of this warm pool and its relation to the onset
of summer monsoon over Kerala. This phenomenon was
studied utilizing NCEP/NCAR (National Center for Environmental
Prediction/National Center for Atmospheric and
Research) re-analysis data, TRMM Micro wave Imager
(TMI) and observational data. To define the ASMWP, sea
surface temperature exceeding 30.25 C was taken as the
criteria. The warm pool attained its maximum dimension
and intensity nearly 2 weeks prior to the onset of summer
monsoon over Kerala. Interestingly, the warm pool started
its dissipation immediately after attaining its maximum
core temperature. This information can be included in the
present numerical models to enhance the prediction capability.
It was also found that the extent and intensity of the
ASMWP varied depending on the type of monsoon i.e.,
excess, normal, and deficient monsoon. Maximum core
temperature and wide coverage of the warm pool observed
during the excess monsoon years compared to normal and deficient monsoon years. The study also revealed a strong
relationship between the salinity in the eastern Arabian Sea
and the nature of the monsoon