In this paper, a dual port, dual frequency, dual polarized,
octagonal shaped Microstrip patch antenna, suitable for GPS
applications is discussed experimentally and theoretically. The
proposed antenna configuration is characterized by good
impedance bandwidth, gain, isolation between two ports and
broad radiation patterns
Description:
Personal Wireless Communications, 2005. ICPWC 2005. 2005 IEEE International Conference on,PP 305-307
Harilal, S S; Bindhu, C V; Issac, Riju C; Nampoori, V P N; Vallabhan, C P G(American Institute of Physics, September 1, 1997)
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Abstract:
Plasma generated by fundamental radiation from a Nd:YAG laser focused onto a graphite target is studied spectroscopically. Measured line profiles of several ionic species were used to infer electron temperature and density at several sections located in front of the target surface. Line intensities of successive ionization states of carbon were used for electron temperature calculations. Stark broadened profiles of singly ionized species have been utilized for electron density measurements. Electron density as well as electron temperature were studied as functions of laser irradiance and time elapsed after the incidence of laser pulse. The validity of the assumption of local thermodynamic equilibrium is discussed in light of the results obtained.
Geetha K, Varier; Harilal, S S; Bindhu, C V; Riju, C Issac; Nampoori, V P N; Vallabhan, C P G(December 3, 2011)
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Abstract:
Irradiation of a Polymethyl methacrylate target using a pulsed Nd-YAG laser causes plasma formation in the vicinity of the target. The refractive index gradient due to the presence of the plasma is probed using phase-shift detection technique. The phase-shift technique is a simple but sensitive technique for the determination of laser ablation threshold of solids. The number density of laser generated plasma above the ablation threshold from Polymethyl methacrylate is calculated as a function of laser fluence. The number density varies from 2×1016 cm-3 to 2×1017 cm-3 in the fluence interval 2.8-13 J · cm-2.
The electron-donor properties of Sm2O3 activated at 300, 500, and 800°C are reported from studies on the adsorption of electron acceptors of various electron affinities (electron affinity values in eV are given in parentheses): 7,7,8,8-tetracyanoquino-dimethane (2.84), 2,3,5,6-tetrachloro-1,4-benzoquinone (2.40), p-dinitrobenzene (1.77), and m-dinitrobenzene (1.26) in acetonitrile and 1,4-dioxane. The extent of electron transfer during the adsorption was determined from magnetic measurements. The acid-base properties of Sm2O3 at different activation temperatures are reported using a set of Hammett indicators. Electron donor-acceptor interactions at interfaces are important in elucidating the adhesion forces.
Sugunan, S; Jalaja, J M(Indian Journal of Chemistry, March , 1995)
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Abstract:
The electron donating properties of Ce02 and its mixed
oxides with alumina have been determined from the studies
of adsorption of electron acceptors of various electron
affinities on the surface of these oxides. The catalytic
activity of these oxides towards some reactions such as
oxidation of alcohols and reduction of ketones have been
Correlated with their surface electrondonor properties. The
surface acidity/basicity of these oxides have also been
determined by titration method using a set of Hammett
indicators.
The catalytic activity of Perovskite-type mixed oxides (LaCo03 . PrCo03 and SmCo03 ) for the
reduction of cyclohexanone to cyclohexanol with 2-propanol (Meerwein-Ponndorf-Verley reduction)
has been studied. The data have been correlated with the surface electron donor properties
of these mixed oxides.
Sugunan, S; Devika Rani, G(Indian Journal of Chemistry, November , 1993)
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Abstract:
The adsorption of electron acceptors, viz.,7,7,8,8-tetracyanoquinodimethane(TCNQ), 2,3,5,6-tetrachloro-p-
benzoquinone (chloranil) and p-dinitrobenzene
(PDNB) on the surface of three rare earth oxides Y2O3,
Nd203 and Pr6O11 has been studied in acetonitrile and
dioxan. From the radical concentration on the surface
determined using ESR spectral data, the electron donor
strength of the rare earth oxides are reported.
Suresh, Vettoor V; Nandakumaran, V M(World Scientific Publishing Company, 1990)
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Abstract:
Electron-phonon interaction is considered within the framework of the fluctuating
valence of Cu atoms. Anderson's lattice Hamiltonian is suitably modified to take this into
account. Using Green's function technique tbe possible quasiparticle excitations' are
determined. The quantity 2delta k(O)/ kB Tc is calculated for Tc= 40 K. The calculated values
are in good agreement with the experimental results.
Harilal, S S; Issac, Riju C; Bindhu, C V; Nampoori, V P N; Vallabhan, C P G(American Institute of Physics, April , 1997)
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Abstract:
The emission features of laser ablated graphite plume generated in a helium ambient atmosphere have been investigated with time and space resolved plasma diagnostic technique. Time resolved optical emission spectroscopy is employed to reveal the velocity distribution of different species ejected during ablation. At lower values of laser fluences only a slowly propagating component of C2 is seen. At high fluences emission from C2 shows a twin peak distribution in time. The formation of an emission peak with diminished time delay giving an energetic peak at higher laser fluences is attributed to many body recombination. It is also observed that these double peaks get modified into triple peak time of flight distribution at distances greater than 16 mm from the target. The occurrence of multiple peaks in the C2 emission is mainly due to the delays caused from the different formation mechanism of C2 species. The velocity distribution of the faster peak exhibits an oscillating character with distance from the target surface.
Successful management is dependent heavily on the manager’s ability to handle conflict
effectively. The workforce has been increasingly becoming diversified vis-à-vis the gender,
culture and ethnicity. The present work environment has in itself contributed to sowing seeds of
conflict with greater diversity, hostility, complexity and newer business competencies in the
work context.The classic study of Mintzberg’s Managerial roles approach (1973) also says that a
manager has to spend sufficient time and energy in solving conflict as he has to take roles as a
negotiator, and dispute handler. An understanding of the conflict and role that it plays in
influencing employee behavior constructively or destructively is immense. Therefore conflict
when left unmanaged can lead to diminished cohesiveness amongst employees, productivity and
reduced organizational fitness. To manage conflict effective conflict resolution strategies that
have constructive outcomes is called for. Conflict resolution style theorists opine that
collaborative or integrative style, where there is high concern for task and people is considered to
give positive individual and organizational outcomes, while the withdrawing /avoidance style
and forcing / dominating style are considered to be ineffective in managing conflict. Though
managers have typical preferences in the styles followed it need not necessarily be the typical
response as it depends on the context, power relationships, emotions etc. The adoption of conflict
styles of managers however is dependent on variables like gender orientation, cultural values,
personality orientation, underlying relationships – public/private.
The paper attempts to draw the importance of managing conflicts at workplace positively and the
need for effective conflict resolution strategies. The conflict style adopted and the variables that
affect the adoption of each style are discussed and possible interventions at the workplace are
suggested
Description:
International Journal of Social Science & Interdisciplinary Research,
Vol.2 (2), FEBRUARY (2013
A new localization approach to increase the navigational
capabilities and object manipulation of autonomous
mobile robots, based on an encoded infrared sheet of light
beacon system, which provides position errors smaller than
0.02m is presented in this paper. To achieve this minimal
position error, a resolution enhancement technique has
been developed by utilising an inbuilt odometric/optical
flow sensor information. This system respects strong low
cost constraints by using an innovative assembly for the
digitally encoded infrared transmitter. For better guidance
of mobile robot vehicles, an online traffic signalling capability
is also incorporated. Other added features are its less
computational complexity and online localization capability
all these without any estimation uncertainty. The
constructional details, experimental results and computational
methodologies of the system are also described
Description:
Journal of Automation, Mobile Robotics & Intelligent Systems VOLUME 3, N° 2 2009
Indulal,G; Vijayakumar,A(Springer, October , 2007)
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The energy of a graph G is the sum of the absolute values of its eigenvalues. In this
paper, we study the energies of some classes of non-regular graphs. Also the spectrum
of some non-regular graphs and their complements are discussed.
Santhosh Kumar, G; Sitara, A; Poulose Jacob,K(I. K. International Publishing House, November 24, 2010)
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Clustering combined with multihop communication is a promising solution to cope with the energy requirements
of large scale Wireless Sensor Networks. In this work, a new cluster based routing protocol referred to as Energy
Aware Cluster-based Multihop (EACM) Routing Protocol is introduced, with multihop communication between
cluster heads for transmitting messages to the base station and direct communication within clusters. We propose
EACM with both static and dynamic clustering. The network is partitioned into near optimal load balanced
clusters by using a voting technique, which ensures that the suitability of a node to become a cluster head is
determined by all its neighbors. Results show that the new protocol performs better than LEACH on network
lifetime and energy dissipation
Description:
International Journal of Information Processing, 4(3), 9-16, 2010
Data caching is an attractive solution for reducing bandwidth demands and
network latency in mobile ad hoc networks. Deploying caches in mobile nodes can reduce
the overall traf c considerably. Cache hits eliminate the need to contact the data source
frequently, which avoids additional network overhead. In this paper we propose a data
discovery and cache management policy for cooperative caching, which reduces the power
usage, caching overhead and delay by reducing the number of control messages flooded into the network .A cache discovery process based on position cordinates of neighboring nodes is developed for this .The stimulstion results gives a promising result based on the metrics of the studies.
Poulose Jacob,K; Santhosh, Simon(International Journal of Engineering and Innovative Technology (IJEIT), October , 2013)
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Abstract:
The evolution of wireless sensor network technology has enabled us to develop advanced systems for real time monitoring. In the present scenario wireless sensor networks are increasingly being used for precision agriculture. The advantages of using wireless sensor networks in agriculture are distributed data collection and monitoring, monitor and control of climate, irrigation and nutrient supply. Hence decreasing the cost of production and increasing the efficiency of production. This paper describes the security issues related to wireless sensor networks and suggests some techniques for achieving system security. This paper also discusses a protocol that can be adopted for increasing the security of the transmitted data
Description:
International Journal of Engineering and Innovative Technology (IJEIT)
Volume 3, Issue 4, October 2013
Sumam, Mary Idicula; Nikesh, P L; David, Peter S(IEEE, 2008)
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This paper describes about an English-Malayalam
Cross-Lingual Information Retrieval system. The system
retrieves Malayalam documents in response to query given in
English or Malayalam. Thus monolingual information retrieval is
also supported in this system. Malayalam is one of the most
prominent regional languages of Indian subcontinent. It is
spoken by more than 37 million people and is the native language
of Kerala state in India. Since we neither had any full-fledged
online bilingual dictionary nor any parallel corpora to build the
statistical lexicon, we used a bilingual dictionary developed in
house for translation. Other language specific resources like
Malayalam stemmer, Malayalam morphological root analyzer etc
developed in house were used in this work
This paper underlines a methodology for translating text from English into the Dravidian language, Malayalam using statistical models. By using a monolingual Malayalam corpus and a bilingual English/Malayalam corpus in the training phase, the machine automatically generates Malayalam translations of English sentences. This paper also discusses a technique to improve the alignment model by incorporating the parts of speech information into the bilingual corpus. Removing the insignificant alignments from the sentence pairs by this approach has ensured better training results. Pre-processing techniques like suffix separation from the Malayalam corpus and stop word elimination from the bilingual corpus also proved to be effective in training. Various handcrafted rules designed for the suffix separation process which can be used as a guideline in implementing suffix separation in Malayalam language are also presented in this paper. The structural difference between the English Malayalam pair is resolved in the decoder by applying the order conversion rules. Experiments conducted on a sample corpus have generated reasonably good Malayalam translations and the results are verified with F measure, BLEU and WER evaluation metrics
Description:
Proceedings of the 1st Amrita ACM-W Celebration on Women in Computing in India