Vincent, Varghese; Dr. Sebastian Rupert, Mampilly(Cochin University of Science and Technology, 2007)
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Abstract:
Biosocial profile can produce variations in Gender-role Orientation of executives.
Biosocial variables are not responsible for the development of Communication
Style except in cases of number of children, dual career family and fathers
occupation. Gender-role orientation is a function of Communication Style.
Executive performance is a function of Communication Style.Gender- role orientation can have a decisive influence on executive performance.
The cumulative effect of Communication Style and gender role orientation can
produce variations in executive performance. Open Communication Style is
predominantly responsible for the creation of a higher level executive
performance than other Communication Styles.
Description:
School of Management Studies,
Cochin University of Science & Technology
The effect of glass additives on the densification , phase evolution, microstructure and microwave dielectric properties of Ba(Mg1;3
Ta2i3)03 (BMT) was investigated . Different weight percentages of quenched glass such as B203 , Si02, B203-SiO2, ZnO-B203,
5ZnO-2B2O3, Al203-SiO2, Na20-2B203.10H20, BaO-B203-SiO2, MgO-B203-SiO2, PbO-B203-SiO2 , ZnO-B203-SiO2 and
2MgO-Al203-5SiO2 were added to calcined BMT precursor . The sintering temperature of the glass -added BMT samples were
lowered down to 1300 °C compared to solid-state sintering where the temperature was 1650 °C. The formation of high temperature
satellite phases such as Ba5Ta4O15 and Ba7Ta6O22 were found to be suppressed by the glass addition . Addition of glass systems such
as B203, ZnO-B203, 5ZnO-2B203 and ZnO-B203-SiO2 improved the densification and microwave dielectric properties. Other
glasses were found to react with BMT to form low-Q phases which prevented densification . The microwave dielectric properties of
undoped BMT with a densification of 93 . 1 % of the theoretical density were Cr = 24 . 8, Tr = 8 ppm/°C and Q„ x f= 80,000 GHz. The
BMT doped with 1.0 wt% of B203 has Q„ x f = 124,700GHz, Cr = 24.2, and T f = -1.3 ppm /°C. The unloaded Q factor of 0.2 wt%
ZnO-B203-doped BMT was 136,500 GHz while that of 1.0 wt% of 5ZnO-2B203 added ceramic was Q„ x f= 141,800 GHz . The best
microwave quality factor was observed for ZnO -B203-SiO2 (ZBS) glass-added ceramics which can act as a perfect liquid-phase
medium for the sintering of BMT. The microwave dielectric properties of 0.2wt% ZBS-added BMT dielectric was
Q„ x f= 152,800 GHz, F,= 25.5, and Tr = - 1.5 ppm/°C
Jose Sebastian; Dr. Eby Thomas Thachil(September 23, 2015)
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Abstract:
Organic-inorganic nanocomposites combine unique properties of
both the constituents in one material. Among this group of materials,
clay based as well as ZnO, TiO2 nanocomposites have been found to
have diverse applications. Optoelectronic devices require polymerinorganic
systems to meet certain desired properties. Dielectric
properties of conventional polymers like poly(ethylene-co-vinyl acetate)
(EVA) and polystyrene (PS) may also be tailor tuned with the
incorporation of inorganic fillers in very small amounts. Electrical
conductivity and surface resistivity of polymer matrices are found to
improve with inorganic nanofillers. II-VI semiconductors and their nano
materials have attracted material scientists because of their unique
optical properties of photoluminescence, UV photodetection and light
induced conductivity. Cadmium selenide (CdSe), zinc selenide (ZnSe)
and zinc oxide (ZnO) are some of the most promising members of the IIVI
semiconductor family, used in light-emitting diodes, nanosensors,
non-linear optical (NLO) absorption etc. EVA and PS materials were
selected as the matrices in the present study because they are
commercially used polymers and have not been the subject of research
for opto-electronic properties with semiconductor nanomaterials
Shouri, P V; Dr.Sreejith,P S(Cochin University of Science and Technology, March , 2007)
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Abstract:
In the present scenario of energy demand overtaking energy supply top priority is given
for energy conservation programs and policies. Most of the process plants are operated
on continuous basis and consumes large quantities of energy. Efficient management of
process system can lead to energy savings, improved process efficiency, lesser operating
and maintenance cost, and greater environmental safety. Reliability and maintainability
of the system are usually considered at the design stage and is dependent on the system
configuration. However, with the growing need for energy conservation, most of the
existing process systems are either modified or are in a state of modification with a view
for improving energy efficiency. Often these modifications result in a change in system
configuration there by affecting the system reliability. It is important that system
modifications for improving energy efficiency should not be at the cost of reliability. Any
new proposal for improving the energy efficiency of the process or equipments should
prove itself to be economically feasible for gaining acceptance for implementation. In
order to arrive at the economic feasibility of the new proposal, the general trend is to
compare the benefits that can be derived over the lifetime as well as the operating and
maintenance costs with the investment to be made. Quite often it happens that the
reliability aspects (or loss due to unavailability) are not taken into consideration. Plant
availability is a critical factor for the economic performance evaluation of any process
plant.The focus of the present work is to study the effect of system modification for improving
energy efficiency on system reliability. A generalized model for the valuation of process
system incorporating reliability is developed, which is used as a tool for the analysis. It
can provide an awareness of the potential performance improvements of the process
system and can be used to arrive at the change in process system value resulting from
system modification. The model also arrives at the pay back of the modified system by
taking reliability aspects also into consideration. It is also used to study the effect of
various operating parameters on system value. The concept of breakeven availability is
introduced and an algorithm for allocation of component reliabilities of the modified
process system based on the breakeven system availability is also developed. The model
was applied to various industrial situations.
Description:
Division of Mechanical Engineering,Cochin University of Science and
Technology
Sarala Devi,K; Dr.Unnithan, R V(Cochin University of Science And Technology, November , 1986)
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Abstract:
Cochin backwaters, a tropical barbuilt estuary is well known for its prawn,
molluscan and demersal fisheries. Also it formed the dumping area for sewage,235
retting of husks and discharge of effluents from industries located on either side
of it. As a result the fishery is being gradually dwindled year after year due to
the lowering of the water quality. The effect of industrial polution on the benthic
community of this tropical estuary was worked out. An area extending over 21
km from the mouth of the estuary to upstream of industrial belt was selected.
Temporal and spatial variations of 16 environmental parameters at 9 stations
along the area were monitored monthly during 1981. Benthic fauna of these 9
stations consisted of amphipods , polychaetes, isopods, tanaidaceans, molluscs
and other crustaceans (Decapods, Acetes, Alpheids, Balanus, insect larvae,
chironomid larvae, cumacea and some fresh water forms ). Apart from these, sea
anemone, flat worms, nematodes, sipunculoids, echinoderms and fishes were
also encountered. 75 species belonging to 31 faunal groups were identified. Of
these 31 groups, amphipods, polychaedes, isopods, tanaidaceans and molluscs
were numerically abundant. Rest of the 26 groups (including 13 riverine forms)
were found less significant due to their rare occurrence/low numerical abundance.
Polychaetes and molluscs were the only major groups present at all the stations.
Description:
National Institute of Oceanography Regional Centre Cochin
Ponnachan,P T C; Paulose,C S; Panikkar, K R(Department of Biotechnology, April , 1993)
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Abstract:
Alloxan induced animal model was used to evaluate the potential antidiabetic effect of A . marmelose leaf
extract. The diabetic animals were given insulin injection and another group A . marmelose leaf extract orally.
It maintained the weight of the animals near to the control rats but a significant decrease in weight was noted it
diabetic animals without any treatment . The blood elucose level in 'treated animals were near to that of control
ones. Also a significantly increased glucose tolerance was observed in animals orally given the leaf extract
prior to the experiment . A significant decrease in liver glycogen ( 1.24 -.07 s!/ 100 g of wet tissue) was observed
in diabetic rats which was brought to almost the normal level (I.84- . 14 g; 100 g) with Icaf extract treatment.
Blood urea and serum cholesterol increased ( 62.66 - 3.50 and 192.67± 13.64 mg' dl) significantly in alloxxan
diabetic rats . The leaf extract treatment decreased the blood urea and serum . cholesterol (37.83 - 3.97 and
99?0±8.43 mg/dl ) to that of control ones . A similar effect was seen with insulin treatment . The results
indicate that the active principle in .4. marmelose leaf extract has similar hypoglycaemic activity to insulin
treatment.
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
Shenoy, S D; Joy, P A; Anantharaman, M R(Elsevier, February , 2004)
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Abstract:
Nanosized ZnFe2O4 particles containing traces of a-Fe2O3 by intent were produced by low temperature chemical
coprecipitation methods. These particles were subjected to high-energy ball milling. These were then characterised using
X-ray diffraction, magnetisation and dielectric studies. The effect of milling on zinc ferrite particles have been studied
with a view to ascertaining the anomalous behaviour of these materials in the nanoregime. X-ray diffraction and
magnetisation studies carried out show that these particles are associated with strains and it is the surface effects that
contribute to the magnetisation. Hematite percentage, probably due to decomposition of zinc ferrite, increases with
milling. Dielectric behaviour of these particles is due to interfacial polarisation as proposed by Koops. Also the defects
caused by the milling produce traps in the surface layer contributes to dielectric permittivity via spin polarised electron
tunnelling between grains. The ionic mechanism is enhanced in dielectrics with the rise in temperature which results in
the increase of dielectric permittivity with temperature.
Anantharaman, M R; Muhammad, Abdul Jamal E; Mohanan, P; Joy, P A; Philip, Kurian(Springer, May 29, 2009)
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Abstract:
Nickel–rubber nanocomposites were synthesized
by incorporating ferromagnetic nickel nanoparticles in a
natural rubber as well as neoprene rubber matrix. Complex
dielectric permittivity and magnetic permeability of
these composites were evaluated in the X-band microwave
frequencies at room temperature using cavity perturbation
technique. The dielectric loss in natural rubber is smaller
compared to neoprene rubber. A steady increase in the dielectric
permittivity is observed with increase in the content
of nickel in both the composites. The magnetic permeability
exhibits a steady decrease with increase in frequency and
magnetic loss shows a relaxation at 8 GHz. The suitability of
these composites as microwave absorbers is modeled based on the reflection loss which is dependant on the real and
imaginary components of the complex dielectric permittivity
and magnetic permeability.
One-pot acetalizations of cyclohexanone. acetophenone and benzophenone were carried out using methanol over H-montmorillonite clay
(a mesoporous material). silica, alumina, and different zeolites such as HFAU-Y.HBeta, H-ZSM-5, and H-mordenite. In all the cases a single
product-the corresponding dimethylacetal-was obtained in high yields. Hemiacetal formation was not observed with any catalyst. A
comparison of catalytic activity indicated that montmorillonite K-10 is the most active catalyst for the reaction. As evidenced by the reaction
time studies, the catalyst decay is greater over the zeolite catalyst than over the clay.
Anantharaman, M R; Vaidyanathan, G; Arulmurugan, R; Likhite, S D; Milind, Vaidya; Sendhilnathan, S; Senthilram, N D(NATL INST SCIENCE COMMUNICATION, December 12, 2003)
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Abstract:
Mixed ferrites belonging to the type Mn0.9Zn0.1Fe2O4 have been prepared by the double sintering method and by the
chemical co-precipitation for comparing their magnetic properties. Sintered and precipitated ferrites exhibit different
characteristics, especially in their magnetic properties like magnetization (Ms), coercive field (Hc) and Curie temperature
(Tc). The sintered particles were size reduced in order to compare with the nanosized co-precipitated particles. The effect of
grinding has also been studied. Particles have been collected at regular intervals of grinding and their properties have been
studied. The increase in the coercive field has been recorded by a hysteresis curve tracer confirming size reduction. X-ray
diffraction studies confirmed the structure and consequent size reduction
Description:
Indian Journal of Engineering & Materials Sciences
Vol. 11, August 2004, pp. 289-294
The effect of various processing parameters, such as nip gap, friction ratio
and roll temperature, on the tensile properties of short Kevlar aramid
fibre-thermoplastic polyurethane composite has been investigated and the tensile
and tear fracture surfaces have been characterised using a scanning electron microscope.
A nip gap of 0.45 mm, a friction ratio of 1.15 and a roll temperature of 62°C
was found to give optimum mechanical properties. Scanning electron microscopy
study revealed a higher extent of fibre orientation in the milling direction in the
above condition.
Paulose,C S; Dakshinamurti,K(Department of Biotechnology, December 19, 1984)
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Abstract:
The high-affinity bindings of [3H]-5-hydroxytryptamine to serotonin S-1 receptors,
[3H]-ketanserin to serotonin S-2 receptors in the cerebral cortex, [3H]-
fluphenazine to dopamine D-1 receptors, and [3H]-spiroperidol to dopamine D-2
receptors in the corpus striatum were studied in pyridoxine-deficient rats and
compared to pyridoxine-supplemented controls. There was a significant increase
in the maximal binding (Bmax) of serotonin S-1 and S-2 receptors with a significant
decrease in their binding affinities (Kd). However, there were no significant
changes either in the maximal binding or binding affinity of striatal dopamine D-
1 and D-2 receptors. Receptor sensitivity seems to correlate negatively with the
corresponding neurotransmitter concentrations in the pyridoxine-deficient rats.
Pyroja, S; Biju,M P; Paulose,C S(Department of Biotechnology, February 11, 1998)
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Abstract:
Effect of pyridoxine on growth, metabolism and cellular activity of
freshwater prawn Macrobrachiuni rosenbergii was studied. Postlarvae
(PL-10) of M. rosenbergii were fed with clam meat containing
various concentrations of pyridoxine. After 30 days RNA and DNA
of the abdominal tissues were estimated. Length, weight and RNA
to DNA ratio increased significantly with increasing concentrations
of pyridoxine. The effect of pyridoxine on the metabolic enzyme,
malate dehydrogenase, was also studied. Vmax showed a significant
decrease and the (Km) showed a significant increase in experimental
groups compared to control.