Rani, Joseph; Jayamma,Francis; George,K E(Pergamon Press Ltd, December 18, 1991)
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Abstract:
The effects of modifying blends of poly(vinyl chloride) (PVC) with linear low density
polyethylene (LLDPE) by means of acrylic acid, maleic anhydride, phenolic resins and p-phenylene
diamine were investigated. Modification by acrylic acid and maleic anhydride in the presence of dicumyl
peroxide was found to be the most useful procedure for improving the mechanical behaviour and adhesion
properties of the blend. The improvement was found to be due mainly to the grafting of the carboxylic
acid to the polymer chains; grafting was found to be more effective in LLDPE/PVC blends than in pure
LLDPE.
Thomas Lee, S; Nibu A, George; Sureshkumar, P; Radhakrishnan, P; Vallabhan, C P G; Nampoori, V P N(Optical Society of America, October 15, 2001)
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Abstract:
We propose and demonstrate the possibility of using a permanently microbent bare optical fiber for detecting
chemical species. Two detection schemes, viz., a bright-field detection scheme (for the core modes), and a
dark-field detection scheme (for the cladding modes) have been employed to produce a fiber-optic sensor. The
sensor described here is sensitive enough to detect concentrations as low as nanomoles per liter of a chemical
species, with a dynamic range of more than 6 orders of magnitude.
Rasheed, T M A; Nampoori, V P N(Springer, March , 1994)
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Abstract:
The CH local mode overtone spectrum of benzyl chloride in the visible and NIR regions studied by laser induced thermal lens and conventional NIR absorption is presented. The analysis shows that the −CH2Cl group is symmetrically oriented with respect to the benzene ring, thus finalizing one of the two possible conformational models predicted by electron diffraction studies. The aryl CH bonds have a slightly larger force constant than that in benzene.
Girish Kumar, K; Saji John, K; Indira, C J(Indian Journal of Chemical Technology, November 18, 2005)
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Abstract:
This paper describes the fabrication of an ion-selective electrode in which a polymeric Schiff base complex of cobalt(II) is used as the ionophore.The main advantage of the electrode is that it is mechanically stable upto 3 months..The electrode shows a linear response in the range of 2.5 × 10-5-0.5 × 10-1 mol dm-3. The response time of the electrode is 30 s.The pH range at which the electrode works is 3.8 to 6.8. The electrode was found to be selective towards chloride ion in the presence of ions like Na+, Ca2+, Mn2+, ,Fe3+, Co2+, Ni2+, Cu2+, Zn2+, CH3COO-, NO3-, SO42- ,Br- and NO2-.
Abdul Rasheed, T M; Moosad, K P B; Nampoori, V P N; Sathianandan, K(American Chemical Society, 1987)
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Abstract:
Vibrational overtone spectra of acetophenone and benzaldehyde in the visible and near-infrared regions are studied by the
dual beam thermal lens and the conventional near-infrared absorption techniques. The observed increase in the mechanical
frequency of the aryl CH bond from that of benzene is attributed to the decrease in the aryl CH bond length caused by
the electron-withdrawing property of the substituents. Overtone spectra also demonstrate that acetophenone contains two
types of methyl CH bonds arising from the anisotropic environments created by oxygen lone pair and carbonyl P electrons.
The local-mode parameters of the two types of CH bonds are compared with those of acetone and acetaldehyde. The possible
factors influencing the methyl CH bonds in acetophenone are discussed.
Paulose,C S; Dakshinamurti,K(Department of Biotechnology, June 12, 1987)
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Abstract:
Chronic catheterization is illustrated using vascular-access-port model SLA where the port is surgically placed subcutaneously on
the back of the rat. The catheter is tunnelled to the neck and inserted into the jugular vein . Within 24 h rats showed normal blood
pressure and blood samples were collected at intervals with minimal stress to the animals . A comparison of the plasma catecholamine
of blood collected from vascular-access-ports with that obtained from decapitation indicates that there was minimal stress to the rats
when blood was drawn through the vascular-access-port.
Manju,Paulson; Mohanan,P; Sona,Kundukulam O(Microwave and Optical Technology Letters, September 5, 2000)
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Abstract:
A compact microstrip antenna with circular polarization radiation is demonstrated.A reducation in the required parameters for achieving CP radiation makes the present antenna design simpler
Aanandan,C K; Mohanan,P; K G Nair(Department of Electronics, August 13, 1984)
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Abstract:
Design and development of a circularly polarized and matched H-plane sectorial horn antenna have been reported By
proper trimming of the flange parameters any desired polarization can be obtained from the horn
Mohanan,P; Aanandan,C K; K G Nair(Department of Electronics, August 13, 1984)
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Abstract:
Design and development of a circularly polarized and matched H-plane sectorial horn antenna have been reported By
proper trimming of the flange parameters any desired polarization can be obtained from the horn
K G Nair; Aanandan,C K; Mohanan,P(Department of Electronics, August 13, 1984)
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Abstract:
Design and development of a circularly polarized and matched H-plane sectorial horn antenna have been reported By
proper trimming of the flange parameters any desired polarization can be obtained from the horn
Deepti Das, Krishna; Aanandan, C K; Mohanan, P; Vasudevan, K(John Wiley & Sons, March 3, 2006)
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Abstract:
Design of a dual-port circular patch antenna with a sector-slot for dual-frequency operation is presented. The antenna resonates at two distinct frequencies with orthogonal polarizations and broad radiation characteristics. Unlike the conventional circular patch, this antenna can be microstrip-fed to operate at either of the resonances. The two polarizations can be simultaneously excited using two electromagnetically coupled ports with an isolation better than −30 dB between the ports. This antenna has the added advantage of size reduction of 44% compared to the conventional circular patch without any reduction in gain.
A graphs G is clique irreducible if every clique in G of size at least two,has an edge which does not lie in any other clique of G and is clique reducible if it is not clique irreducible. A graph G is clique vertex irreducible if every clique in G has a vertex which does not lie in any other clique of G and clique vertex reducible if it is not clique vertex irreducible. The clique vertex irreducibility and clique irreducibility of graphs which are non-complete extended p-sums (NEPS) of two graphs are studied. We prove that if G(c) has at least two non-trivial components then G is clique vertex reducible and if it has at least three non-trivial components then G is clique reducible. The cographs and the distance hereditary graphs which are clique vertex irreducible and clique irreducible are also recursively characterized.
Aparna,Lakshmanan S; Vijayakumar,A(Department of Mathematics, 2008)
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Abstract:
In this paper, two notions, the clique irreducibility and clique vertex
irreducibility are discussed. A graph G is clique irreducible if every
clique in G of size at least two, has an edge which does not lie in any
other clique of G and it is clique vertex irreducible if every clique in G
has a vertex which does not lie in any other clique of G. It is proved
that L(G) is clique irreducible if and only if every triangle in G has a
vertex of degree two. The conditions for the iterations of line graph,
the Gallai graphs, the anti-Gallai graphs and its iterations to be clique
irreducible and clique vertex irreducible are also obtained.
Ramachandran, A; Enserink, B; Balchand, A N(Elsevier, Journal of Ocean & Coastal Management, 2005)
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Abstract:
Coastal Regulation Zone (CRZ) notification was issued by the Ministry of Environment
and Forest of Government of India in February 1991 as a part of the Environmental
Protection Act of 1986 to protect the coast from eroding and to preserve its natural resources.
The initial notification did not distinguish the variability and diversity of various coastal states
before enforcing it on the various states and Union Territories. Impact assessments were not
carried out to assess its impact on socio-economic life of the coastal population. For the very
same reason, it was unnoticed or rather ignored till 1994 when the Supreme Court of India
made a land mark judgment on the fate of the coastal aquaculture which by then had
established as an economically successful industry in many South Indian States. Coastal
aquaculture in its modern form was a prohibited activity within CRZ. Lately, only various
stakeholders of the coast realized the real impact of the CRZ rules on their property rights and business. To overcome the initial drawbacks several amendments were made in the regulation
to suit regional needs.
In 1995, another great transformation took place in the State of Kerala as a part of the reorganization
of the local self government institutions into a decentralized three tier
system called ‘‘Panchayathi Raj System’’. In 1997, the state government also decided to
transfer the power with the required budget outlay to the grass root level panchayats
(villages) and municipalities to plan and implement the various projects in their localities
with the full participation of the local people by constituting Grama Sabhas (Peoples’ Forum).
It is called the ‘‘Peoples’ Planning Campaign’’(Peoples’ Participatory Programme—PPP
for Local Level Self-Governance). The management of all the resources including the local
natural resources was largely decentralized to the level of local communities and villages.
Integrated, sustainable coastal zone management has become the concern of the local
population.
The paper assesses the socio-economic impact of the centrally enforced CRZ and the state
sponsored PPP on the coastal community in Kerala and suggests measures to improve the
system and living standards of the coastal people within the framework of CRZ.
Mohammed Yusuff, K K; Suja, N R(Journal of Applied Polymer Science,Wiley InterScience, August 10, 2003)
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Abstract:
Two novel polystyrene-supported Schiff
bases, PSOPD and PSHQAD, were synthesized. A polymerbound
aldehyde was condensed with o-phenylenediamine
to prepare the Schiff base PSOPD, and a polymer-bound
amine was condensed with 3-hydroxyquinoxaline-2-carboxaldehyde
to prepare the Schiff base PSHQAD. This article
addresses the study of cobalt (II), nickel (II), and copper (II)
complexes of these polymer-bound Schiff bases. All the complexes
were characterized, and the probable geometry was suggested using elemental analysis, diffuse reflectance ultraviolet,
Fourier transform infrared spectroscopy, thermal
studies, surface area studies, and magnetic measurements.
Issac, R C; Varier, G K; Harilal, S S; Nampoori, V P N; Vallabhan, C P G(Springer, 1998)
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Abstract:
The dynamics of diffusion of electrons and ions from the laser-produced plasma from a multielement superconducting material, namely YBa2Cu3O7, using a Q-switched Nd:YAG laser is investigated by time-resolved emission-spectroscopic techniques at various laser irradiances. It is observed that beyond a laser irradiance of 2.6 \xC3\x97 1011 W cm-2, the ejected plume collectively drifts away from the target with a sharp increase in velocity to 1.25 \xC3\x97 106 cm s-1, which is twice its velocity observed at lower laser irradiances. This sudden drift apparently occurs as a result of the formation of a charged double layer at the external plume boundary. This diffusion is collective, that is, the electrons and ions inside the plume diffuse together simultaneously and hence it is similar to the ambipolar diffusion of charged particles in a discharge plasma
Xiong,X Z; Fusco,V F(Microwave and Optical Technology Letters, August 5, 2002)
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Abstract:
In this Letter a new physical model for metal-insulatormetal
CMOS capacitors is presented. In the model the parameters of the
circuit are derived from the physical structural details. Physical behaviors
due to metal skin effect and inductance have been considered. The
model has been confirmed by 3D EM simulator and design rules proposed.
The model presented is scalable with capacitor geometry, allowing
designers to predict and optimize quality factor. The approach has
been verified for MIM CMOS capacitors