Pratap, R; Nampoori, V P N; Lalaja, Varghese(International Journal of Neuroscience, 1988)
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Abstract:
It is shown that the invariant integral, viz., the Kolmogorov second entropy, is eminently suited to characterize EEG quantitatively. The estimation obtained for a "clinically normal" brain is compared with a previous result obtained from the EEG of a person under epileptic seizure.
For the discrete-time quadratic map xt+1=4xt(1-xt) the evolution equation for a class of non-uniform initial densities is obtained. It is shown that in the t to infinity limit all of them approach the invariant density for the map.
Chandra Bose,D; Dr.Sankaranarayanan, K C(Cochin University of Science and Technology, August 21, 1995)
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Abstract:
The thesis entitled Inventory Management In Public Sector Electrical Industry In Kerala. Investigations were carried out on inventory management in public sector electrical industry in Kerala and suggest methods to improve their efficiency. Various aspects of inventory management, its scope and need in industry are detailed. The objectives of the present study concentrates to get an overall view of the system of inventory management, assess the positions and levels of inventory. It analyzes the inventory management policies and practices, the organizational set-up for materials by the electrical undertakings. The study examines the liquidity of the electrical undertakings as well as techniques of inventory management in the electrical industry in Kerala. Hypotheses state that the existing organizational systems and practices are inadequate to ensure efficient management of inventories in electrical industry. Introduction of scientific inventory techniques has a favourable effect on the workings of inventory departments. The financial performance of the public sector electrical undertakings is not at all satisfactory on account of the high raw material costs, heavy borrowings and huge interest burdens. The scope of this study is limited to the assessment of savings, in inventories of electrical products due to inventory management. The methodology of the study is to project the cost reduction of the inventory department on the basis of data collected and to validate this projection with the aid of analysis and survey. The limitations of the study is that the data obtained relate to the period 1989-90 and earlier and the current position is not available and uniform norms cannot be applied to evaluate different inventory management organisation.
Description:
Department of Applied Economics, Cochin University of Science and Technology
Anantharaman, M R; Veena Gopalan, E; Al-Omari, I A; Sakthi Kumar, D; Yasuhiko, Yoshida; Joy, P A(Springer, February 14, 2010)
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Abstract:
The magnetocaloric properties of cobalt ferrite
nanoparticles were investigated to evaluate the potential of
these materials as magnetic refrigerants. Nanosized cobalt
ferrites were synthesized by the method of sol–gel combustion.
The nanoparticles were found to be spherical with
an average crystallite size of 14 nm. The magnetic entropy
change ( Sm) calculated indirectly from magnetization
isotherms in the temperature region 170–320 K was
found to be negative, signifying an inverse magnetocaloric
effect in the nanoparticles. The magnitudes of the Sm values
were found to be larger when compared to the reported
values in the literature for the corresponding ferrite materials
in the nanoregime.
Invertase was immobilised on microporous montmorillonite K-10 via adsorption and covalent binding. The immobilised enzymes were tested for sucrose hydrolysis activity in a batch reactor. Km for immobilised systems was greater than free enzyme. The immobilised forms could be reused for 15 continuous cycles without any loss in activity. After 25 cycles, 85% initial activity was retained. A study on leaching of enzymes showed that 100% enzyme was retained even after 15 cycles of reuse. Leaching increased with reaction temperature. Covalent binding resisted leaching even at temperatures of 70 °C.
Supriyo,Dey; Dr.Nair, K G(Cochin University of Science and Technology, December 28, 1993)
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Abstract:
This thesis Entitled Investigations on Broadband planar Dipole Antennas. An antenna is a device ordinarily used for both transmitting and receiving electromagnetic energy. It is an integral part of the radio communication system and accounts for a good deal of progress that has been made in this field during the last few decades.The effect of flaring the dipole arms is studied in Section 4.1. It is observed that the flaring modifies the impedance characteristics of the dipole. In particular, the change in the reactive part of the impedance with frequency is controlled considerably. This improves the 2:1
VSWR bandwidth of the antenna. The effect of various other design parameters on the impedance bandwidth of the antenna are also studied. The important conclusion drawn is that, there is considerable improvement in the impedance bandwidth of the dipole when ground arm dimensions are larger than the main arm dimensions.
Theoretical analysis of various cavity backed antennas are given in Chapter 6. The experimental values agree well with the computation. Also the theory gives a clear inside view and explains the reasons for bandwidth enhancement due to flaring and end-loading of the dipole arms. The percentage bandwidth is determined by calculating the Q of the antenna. Since the approach is for the analysis of microstrip antenna on thick grounded substrate, this method cannot be used to predict the impedance bandwidth of the antennas without cavity backup. Also, the structures analysed are simplified versions of the optimised ones. Specially, the arms overlapping is neglected in the analysis. Also, the antennas with symmetrical arms can only be analysed with this theory.
Description:
Department of Electronics, Cochin
University of Science and Technology
Ram Mohan, H S; Subash, N; Sikka, A K(Springer, 2010)
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Abstract:
Mann–Kendall non-parametric test was employed for observational trend detection of monthly, seasonal and
annual precipitation of five meteorological subdivisions of
Central Northeast India (CNE India) for different 30-year
normal periods (NP) viz. 1889–1918 (NP1), 1919–1948
(NP2), 1949–1978 (NP3) and 1979–2008 (NP4). The trends
of maximum and minimum temperatures were also investigated.
The slopes of the trend lines were determined using the
method of least square linear fitting. An application of Morelet
wavelet analysis was done with monthly rainfall during June–
September, total rainfall during monsoon season and annual
rainfall to know the periodicity and to test the significance of
periodicity using the power spectrum method. The inferences
figure out from the analyses will be helpful to the policy
managers, planners and agricultural scientists to work out
irrigation and water management options under various
possible climatic eventualities for the region. The long-term
(1889–2008) mean annual rainfall of CNE India is
1,195.1 mm with a standard deviation of 134.1 mm and coefficient of variation of 11%. There is a significant decreasing
trend of 4.6 mm/year for Jharkhand and 3.2 mm/day for CNE
India. Since rice crop is the important kharif crop (May–
October) in this region, the decreasing trend of rainfall during
themonth of July may delay/affect the transplanting/vegetative
phase of the crop, and assured irrigation is very much needed
to tackle the drought situation. During themonth of December,
all the meteorological subdivisions except Jharkhand show a
significant decreasing trend of rainfall during recent normal
period NP4. The decrease of rainfall during December may
hamper sowing of wheat, which is the important rabi crop
(November–March) in most parts of this region. Maximum
temperature shows significant rising trend of 0.008°C/year (at
0.01 level) during monsoon season and 0.014°C/year (at 0.01
level) during post-monsoon season during the period 1914–
2003. The annual maximum temperature also shows significant
increasing trend of 0.008°C/year (at 0.01 level) during
the same period. Minimum temperature shows significant
rising trend of 0.012°C/year (at 0.01 level) during postmonsoon
season and significant falling trend of 0.002°C/year
(at 0.05 level) during monsoon season. A significant 4–
8 years peak periodicity band has been noticed during
September over Western UP, and 30–34 years periodicity
has been observed during July over Bihar subdivision.
However, as far as CNE India is concerned, no significant
periodicity has been noticed in any of the time series.
Hatha, A A M; Mujeeb Rahiman, K M; Deborah, Gnana Selvam(The ScientificWorld Journal, October 31, 2011)
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Abstract:
A yearlong (September 2009–August 2010) study was undertaken to find out possible reasons for occasional occurrence of
White Spot Syndrome Virus (WSSV) outbreak in the traditional prawn farms adjoining Cochin backwaters. Physicochemical and
bacteriological parameters of water and sediment from feeder canal and four shrimp farms were monitored on a fortnightly basis.
The physicochemical parameters showed variation during the two production cycles and between the farms studied. Dissolved
oxygen (DO) content of water fromfeeder canal showed low oxygen levels (as low as 0.8mg/L) throughout the study period. There
was no disease outbreak in the perennial ponds. Poor water exchange coupled with nutrient loading from adjacent houses resulted
in phytoplankton bloom in shallow seasonal ponds which led to hypoxic conditions in early morning and supersaturation of DO
in the afternoon besides considerably high alkaline pH. Ammonia levels were found to be very high in these ponds.WSSV outbreak
was encountered twice during the study leading to mass mortalities in the seasonal ponds. The hypoxia and high ammonia content
in water and abrupt fluctuations in temperature, salinity and pH might lead to considerable stress in the shrimps triggeringWSSV
infection in these traditional ponds
Description:
The ScientificWorld Journal
Volume 2012, Article ID 340830, 11 pages
Nelson, Rodrigues; Dr. Jacob, Philip(Cochin University of Science and Technology, March , 1997)
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Abstract:
The dielectric and elastic properties are of considerable significance to the science and
technology of matter in the solid state. The study of these properties give information
about the magnitude of the forces and nature of the bonding between the atoms. Our
aim has been to investigate systematically the effect of doping of an appropriate element
on the elastic and dielectric properties of selected dielectric ceramics and oxide glasses.
These materials have got wide technological applications due to their interesting electrical, optical, thermal and elastic behaviour. Ultrasound propagation and capacitance
measurement techniques have been employed for the systematic investigation of the
elastic and dielectric properties of selected number of these materials. Details of the
work done and results obtained are presented in this thesis.
Description:
Department of Physics, Cochin
University of Science and Technology
Bindhu, C V; Harilal, S S; Nampoori, V P N; Vallabhan, C P G(Indian Academy of Sciences, April , 1999)
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Abstract:
Thermal lensing effect was studied in aqueous solutions of rhodamine B using 532 nm,
9 ns pulses from a Nd:YAG laser. A low intensity He-Ne laser beam was used for probing the thermal
lens. Results obtained show that it is appropriate to use this technique for studying nonlinear absorption
processes like two photon absorption or excited state absorption and for analyzing dimerization
equilibria.
Sankarjee,V N; Sadasivan Nair,G(Department of Law, School of Legal Studies, 2003)
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Abstract:
The study is a close scrutiny of the process of investigation of offences in India along with an analysis of powers and functions of the investigating agency.
The offences, which are prejudicial to sovereignty, integrity and security of the nation or to its friendly relations with foreign states, are generally called the offences against national security. Offences against national security being prejudicial to the very existence of the nation and its legal system, is a heinous and terrible one. As early as 1971 the Law Commission of India had pointed out the need of treating the offences relating to national security and their perpetrators on a totally different procedural footing. The recommendation that, all the offences coming under the said category ought to be brought under the purview of a single enactment so as to confront such offences effectively. The discrepancies in and inadequacies of the criminal justice system in India as much as they are related to the investigations of the offences against national security are examined and the reforms are also suggested. The quality of criminal justice is closely linked with the caliber of the prosecution system and many of the acquittals in courts can be ascribed not only to poor investigations but also to poor quality of prosecution.
Rachel, Reena Philip; Dr.Pradeep, B(Cochin University of Science And Technology, December , 2004)
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Abstract:
Investigations on thin films that started decades back due to scientific curiosity in the
properties of a two-dimensional solid, has developed into a leading research field in
recent years due to the ever expanding applications of the thin films in the fann of a
variety of active and passive microminiaturized components and devices, solar cells,
radiation sowces and detectors, magnetic memory devices, interference filters,
refection and antireflection coatings etc. [1]. The recent environment and energy
resource concerns have aroused an enonnous interest in the study of materials in thin
film form suitable for renewable energy sources such as photovoltaic devices.
Recognition of the immense potential applications of the chalcopyrites that can fonn
homojunctions or heterojunctions for solar cell fabrication has attracted many
researchers to extensive and intense research on them.
In this thesis, we have started with studies performed on CuInSe, thin films, a
technologically well recognized compound belonging to the l•ill-VI family of
semiconductors and have riveted on investigations on the preparation and
characterization of compoWlds Culn3Se5. Culn5Seg and CuIn7Se12, an interesting group
of compounds related to CuInSe2 called Ordered Vacancy Compounds, having
promising applications in photovoltaic devices. A pioneering work attempted on
preparing and characterizing the compound Culn7Sel2 is detailed in the chapters on
OVC's. Investigation on valence band splitting in avc's have also been attempted for
the first time and included as the last chapter in the thesis. Some of the salient features
of the chalcopyrite c.ompounds are given in the next section .of this introductory
chapter.
Description:
Department of Physics, Cochin University of Science And Technology,
Charlotte,B V; P G Kurup(Department of Physical Oceanography, School of Marine Sciences, 2004)
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Abstract:
The study is undertaken with an objective to investigate the linkage between air-sea fluxes in the Indian Ocean and monsoon forcing. Since the monsoon activity is linked to fluxes, the variability of surface marine meteorological fields under the variable monsoon conditions is also studied. The very objective of the present study is to document various sea surface parameters of the Indian Ocean and to examine the anomalies found in them. Hence it is attempted to relate the anomaly to the variability of monsoon over India, highlighting the occasion of contrasting monsoon periods. The analysis of anomalies of surface meteorological fields such as SST, wind speed and direction, sea level pressure and cloud cover for contrasting monsoons are also studied. During good monsoon years, the pressure anomalies are negative indicating a fall in SLP during pre-monsoon and monsoon months. The interaction of the marine atmosphere with tropical Indian Ocean and its influence on ISMR continue to be an area of active research.