George,K C; Dr.Kurian, C V(Cochin University of Science and Technology, October , 1979)
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Abstract:
The broad objective of the present study is to present a synoptic picture of the distribution and abundance of fish eggs and the lmportant groups of fish larvae obtained off the SW coast of India. so as to delineate the spawning areas and seasones of the fish population. with special reference to the scombroid fishes. An attempt was also made to correlate the occurrence of certain categories of larvae and hydrographical factors like
temperature and salinity. The present effort was a pioneering one in Indian waters. in as much as it involved systematic and seasonally repetitive collection of ichthyoplankton from a large
stretch of our seas and mapping of their distribution and abudance.
Description:
School of Marine Science, Cochin University of Science and Technology
Antony,A; Dr.Kurian, C V(Cochin University of Science And Technology, October , 1979)
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Abstract:
The present investigations confine to a study of the distribution of foraminifera in the estuarine environment and the interstial area of the sandy beaches of the south west coast of India with a view to correlate the distribution and the intensity of occurrence of the various species with hydrographic conditions and the substrate characteristics of the area. Studies on the foraminifera of the estuarine environment were carried out in the vembanad lake ,a major estuary in the south west coast of india extending for about 60km from cochin barmouth in the north to Alleppey in the south.Fortnightly collections of hydrographical data and grab samples of bottom deposit were made for a period of 2 years (july 1973 to june 1975) from fifteen stations chosen along the length of the lake.
Description:
School of marine sciences, Cochin University of Science And Technology
Namboothiripad,P V S; Dr.Parameswaran, Nair N(Cochin University of Science and Technology, November 1, 1979)
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Abstract:
The present study is intended to provide a new scientific approach to the solution of the worlds cost engineering problems encountered in the chemical industries in our nation. The problem is that of cost estimation of equipments especially of pressure vessels when setting up chemical industries .The present study attempts to develop a model for such cost estimation. This in turn is hoped would go a long way to solve this and related problems in forecasting the cost of setting up chemical plants.
Deo Prabha, Vasant; Dr.Sridhar, C S(Cochin University of Science and Technology, 1980)
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Abstract:
RMS measuring device is a nonlinear device consisting of linear and
nonlinear devices. The performance of rms measurement is influenced by a number
of factors; i) signal characteristics, 2) the measurement technique used and
3) the device characteristics. RMS measurement is not simple, particularly when
the signals are complex and unknown. The problem of rms measurement on high
crest-factor signals is fully discussed and a solution to this problem is presented
in this thesis.
The problem of rms measurement is systematically analized and found
to have mainly three types of errors: (1) amplitude or waveform error 2) Frequency
error and (3) averaging error. Various rms measurement techniques are studied
and compared. On the basis of this study the rms -measurement is reclassified
three categories: (1) Wave-form-error-free measurement (2) High-frequncy-error
measurement and (3) Low-frequency error-free measurement. In modern digital
sampled-data systems the signals are complex and waveform-error-free rms
measurement is highly appreciated.
Among the three basic blocks of rms measuring device the squarer
is the most important one. A squaring technique is selected, that permits shaping
of the squarer error characteristic in such a way as to achieve waveform-errob
free rms measurement. The squarer is designed, fabricated and tested.
A hybrid rms measurement using an analog rms computing device and
digital display combines the speed of analog techniques and the resolution and
ease of measurement of digital techniques. An A/D converter is modified to perform
the square-rooting operation. A 10-V rms voltmeter using the developed rms detector
is fabricated and tested.
The chapters two, three and four analyse the problems involved in rms
measurement and present a comparative study of rms computing techniques and
devices. The fifth chapter gives the details of the developed rms detector that
permits wave-form-error free rms measurement. The sixth chapter, enumerates the
the highlights of the thesis and suggests a list of future projects
Description:
Department of Electronics, Cochin University of Science and Technology
Lalitha, P R; Rao, V R; Nampoori, V P N(Current Science, 1980)
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Abstract:
Excitation and emission spectra of SrS : Mn : Ce phosphors have been studied in detail
at various Mn and Ce concentrations. In order to study the effect of external pressure on phosphors,
the samples were pretreated under various pressures. Four bands around 470 nm, 530 nm,
310 nm and 620 nm were observed, when the samples were excited with 265 nm radiation. The
effect of pressure is to reduce the fluorescence ability of the phosphors, and the luminescence
vanishes above O· 1 ton m-2 pressure. The fluorescence ability, however, can be regained on retiring
the sample. The emission mechanism has been attributed to two luminescentcenters in the forbidden
gap. An appreciable amount of photocurrent has also been observed for the sample.
Joy, E C; Dr.Joy, George(Cochin University Of Science And Technology, March 27, 1980)
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Abstract:
This thesis consists of a study of the effect of electrode films and overlayer films on the electrical properties of certain metal films. The films have been prepared on glass substrates by thermal evapouration in a vaccum 10 terr. The properties of Al films on Ag, Al,Au and Cu films on In electrodes ,and Bi/Ag bilayer films have been studied. The influence of annealing electrodes at higher temperature on the electrical properties of metal films has also been investigated. Further the effect of varying layer thickness in the bilayer films ,both annealed at higher temperature and annealed at room temperature have been examined.
Description:
Department Of Physics,Cochin University Of Science And Technology
Simon,Chiu; Paulose,C S; Ram,K Mishra(Department of Bio Technology, July 7, 1980)
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Abstract:
Effect of L-prolyl-cinagta tlheep spyo atenndt idaol paanmti-iPnaer/nkeinusroonleiapnti cp rreocpeeprttoiers b oifn dLi-npgrso.lyPl E-LP-TleIuDcEylS- g2l(y1c)Li n1-a0lem5u-ic1dy1el1-g,(Ply1Lc9iG8n1)a. mw-Taidhsee i nm(vPeeLcstGhiag) anotinesmd n ie onuf rb oaelchetapiovtinico -suuirnbadslu eacrnevddetnarflefetueeacrrtmto
a coephfnp ePtrmLe(2icGc0iaa, lob4 mnl0y io atndnhedevl sii8tn r0oto fem dndgosoi ppktyaag mm o-1fii nn tSeehCr/eng cteiwcau tfiracuolenle edpcptattiiioiclcny r r feienoscrp et ohfpinetvos erer ad ebtali.iyncAsdit)cienusdgit ge bin nyai dfrhimacaatli nonsttpilrseytirar aiatdtuttoimeolnn u(a3aso tmfde PidgfL f hkeGargel -o(n'p2tI0ieaPr ali)ldn.y odB ll ay4-b 0icne omldlneugtdc rk eabgdsy t - c1,aa pcSthoaCrmleo)ponfrsaicypil .heP TidLn hteGoe
pahnidn esp tior odpoepraimdoinl ew raesc aelpstoo ersx ainm tihnee dst.rPiaLtuGm s,elbeuctt ihvaedly n eon ehfafneccte don t h['eH a]ffsipniirtoyp oefr tidhoel sbpiencdifinicg .b Tinhdei nbge hoafv aigouonraislt an[3dH b] iaopcohmemori--
cal results obtained in the present study raise the possibility that PLG may facilitate nigro-striatal dopaminergic neurotransmission
through interacting with a unique PLG receptor functionally coupled to the dopamine receptor cyclase complex. -adenylate
Balachandran,T; Dr.Kurian, C V(Cochin University of Science and Technology, August , 1980)
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Abstract:
Plankton community, drawn from a vary wide variety of animal phyla, formed
the basic food supply of marine life and indicators of water mass. The term
meroplankton generally referred to that portion of the zooplankton which is
transient in nature, remaining rest of their lives in the nektonic or benthic
environment. This group was selected for intensive studies, considering the role
of meroplankton in the economy of the sea and the scarcity of literature on them
from the Indian Ocean. The preser .udy besides providing information regarding
the fixation and preservation !e _ iniques and biochemical aspects of tropical
meroplankton, also consolidates information regarding their zoogeography in the
Indian Ocean region, with a view to amplifying the limited information available
from this area.
The distribution studies are based on the collections made during the International
Indian Ocean Expedition (1960-65), whereas the material for preservation and
biochemical studies was collected from the coastal waters during 1968-1978.
Salient features:- 2% of formaldehyde buffered with 2% borax, added to the
plankton in the ratio of 9:1 was found the best fixative. On fixation the plankton
underwent shrinkage due to loss of 15 to 87% water. Addition of antioxidants
prevented colour fading. Narcotization by different specific reagents prior to
fixation reduced distortions due to violent reaction and improved morphological
conditions. One percent formaldehyde solution in sea water buffered with borax
or neutralised with calcium carbonate perfectly preserved majority of meroplankton.
Equally good was one percent propylene phenoxetol buffered with borax.
Biochemical compostion of vaioous taxa showed variations according to their
age class, size groups metamorphosing stage, feeding mechanism, type of
organism fed and time of collection.
General distribution studies of 4 meroplankton taxa - Anthozoan larvae, cirripedia
larvae, sipunculoid larvae and gastropod larvae stowed abundance in the coastal
areas especially during the SW monsoon period. Based on the larval distribution
different zoo-geographical areas in the Indian Ocean are differentiated.
Description:
School of Marine Science, Cochin University of Science and Technology
Anantharaman, M R; Seshan, K; Venkatesh, Rao; Sashimohan, A L; Keer, H V; Chakrabarty, D K(Springer, November 5, 1980)
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Abstract:
Optimum conditions for the preparation of tape recording quality
Y-Fe20 s by the thermal decomposition of ferrous oxalate dihydrate have been established.
Formation of the intermediate F%O~ which is most important in forming
Y-FezO 3 takes place only in the presence of water vapour. Various stages of
decomposition have been characterised by DTA, TG, DTG, and x-ray powder
diffraction. The method for the preparation of acicular "Y-Fe208 that matches
very well with the commercial tape recording material has been developed
Description:
Bull. Mater. Sei., Vol. 3, Number 2, July 1981, pp. 201-208
Syamaprasad, U; Vallabhan, C P G(Institute of Physics, 1981)
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Abstract:
Four distinct peaks are observed at 140, -26, -132 and -140°C in the sigma x* against T-1 plot between 200 and - 196°C for (NH4)3H(SO4)2, corresponding to four different phase
transitions of which the one at -26°C is reported here for the first time. Data on doped
samples reveal the charge transport mechanism in the crystal.
Premachandran,S K; Dr.Joy, George(Cochin University of Science And Technology, January , 1981)
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Abstract:
The thesis presents the results of the investigations on the crystallisation ‘behaviour, detect
structure end electrical properties of certain organic crystals---phthslic snhydride end potsssiun scid phthalate Hollow crystals of phthalic snhydride were grown from vapour. the norpholog of these hollow crystals were studied in detail and s. mechanism for their growth has been proposed. A closed crystal—vapour system was used to study the basal plane growth of the
whiskers and the sequential growth, observed, confirmed the mechanism suggested for hollow crystals. The dendritic crystals of phthslic enhydride were grown, both iron
the melt and solution. The observed morphologies of these dendrites ere described. Bpherulites of phthalic anhydride have been grown by the artificial initiation of nucleation, from melt and solution. The variation of the substructure oi’ these spherulites with the growth tenperature wee
investigated. The spherulitic filll having ribbon substructure were etched to reveal dislocations. A mechanism for the formation of the observed etch pattern has been suggested. the slip occurring in these ribbons were studied and the results are presented
Description:
Department of physics, Cochin University of Science And Technology
Radhakrishnan, M K; Dr.Joy, George(Cochin University of Science And Technology, February , 1981)
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Abstract:
The Thesis consist of the study of the electrical properties of antimony trisulphide films and the electrical behaviour of different metal contacts to antimony trisulphide films. Since the thermal evapouration of the compound antimony trisulphide as such mayresult in nonstoichiometric compound films , sb2s3 films in the present work were mostly prepared by the three temperature method ,keeping the substrate at different temperature ranging from 3031 to 4231 and evapourating antimony and sulphur simultaneously from separate sources.
Description:
Department of Physics, Cochin University of Science And Technology
Anantharaman, M R; Seshan, K; Chakrabarty, D K; Keer, H V(Springer, February 20, 1981)
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Abstract:
Acicular FeC~O4-2H20 was precipitated from glycerol and starch
media. Thermal decomposition of this oxalate in dry and moist nitrogen yielded
primarily FeO and Fe 3Oa respectively. Characterization was attempted through
DTA, TG, x-ray diffraction, TEM and magnetization studies. It was found
that the oxalate can be completely decomposed to FeaO~ in moist nitrogen
(PH~o ,"-" 35 torr) at 775 K and then oxidised by dry air to acicular "/-Fe~Oa at
575 K. The resulting material has saturation magnetization (,-,., 70 emu/g),
coercive field (N300 Oe) and squareness ratio ( ,~, 0-60-0-65), which values art
comparable with those of the commercial samples
Description:
Bull. Mater. Sci,, Vol, 3, Number 3, November 1981, pp. 275-280.
Padmini,R; Dr.Murthy, A V S(Cochin University of Science And Technology, April , 1981)
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Abstract:
There are only a few attempts in the Indian ocean to evolve reliable climatic models of energy exchange fluxes and to study their inter annul variations. Large space scale and time history of the flux fields could be estimated by the bulk aerodynamic exchange and radiation equation, making use of the climatic normal’s of the related parameters derived from the remarkably good amount of surface marine observations compiled and made available on magnetic tape TDF II by the national climatic centre of NOAA for the period of years 1854 –early 1973. In this thesis the author has made an attempt to calculate the thermal energy exchange fluxes in a meaningful way, using the bulk aerodynamic coefficients which depend on the changes in the wind speed. The spatial and temporal distribution of the exchanges of energy between the ocean and atmosphere , are presented and their impact on the climatic variations of the Indian ocean are discussed from the point of view of predominating air sea interaction processes.
Description:
School of marine sciences, Cochin University of Science And Technology
Syamaprasad, U; Vallabhan, C P G(Elsevier, May , 1981)
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Abstract:
Anomalous variations of d.c. electrical conductivity with temperature are observed in ammonium sulphate single crystals, suggesting a possible phase transition at 150°C. Measurements of thermally stimulated current also support these results. The mechanism of electrical conduction is explained on the basis of studies made on doped and quenched crystals.