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Search Results: 1 - 10 of 138773 matches for " K. Kabilan "
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Catalyst and Solvent-Free Microwave Assisted Expeditious Synthesis of 3-Indolyl-3-hydroxy Oxindoles and Unsymmetrical 3,3-Di(indolyl)indolin-2-ones  [PDF]
Prasanna K. Vuram, C. Kabilan, Anju Chadha
International Journal of Organic Chemistry (IJOC) , 2015, DOI: 10.4236/ijoc.2015.52012
Abstract: A simple and efficient method for the synthesis of 3-indolyl-3-hydroxy oxindoles and unsymmetrical 3,3-di(indolyl)indolin-2-ones using microwave irradiation without catalyst and solvent is described. A series of 3-indolyl-3-hydroxy oxindoles and unsymmetrical 3,3-di(indolyl)indolin-2-ones have been synthesized in very short reaction times of 5 and 10 minutes and in yields ranging from 31% to 98% and from 53% to 78% respectively. This method offers a significant advantage over the conventional methods in terms of simplicity and shorter reaction time. To the best of our knowledge compounds N-allyl-3-hydroxy-3-(1-methyl-indol-3-yl)indolin-2-one (6c), N-allyl-3-hydroxy-3-(5-methoxy-indol-3-yl)indolin-2-one (8c), N-benzyl-3-hydroxy-3-(1-methyl-indol-3-yl) indolin-2-one (10c), N-propargyl-3-hydroxy-3-(1-methyl-indol-3-yl)indolin-2-one (13c), N-propargyl-3-hydroxy-3-(5-methoxy-indol-3-yl)indolin-2-one (14c), 3-(5-methoxy-1H-indol-3-yl)-3-(1H-indol-3-yl)indolin-2-one (1e), 3-1-methyl(5-methoxy-1H-indol-3-yl)-3-(1H-indol-3-yl)indolin-2-one (2e), 3-1-allyl(5-methoxy-1H-indol-3-yl)-3-(1H-indol-3-yl)indolin-2-one (3e), 3-1-benzyl(5-methoxy-1H-in- dol-3-yl)-3-(1H-indol-3-yl)indolin-2-one (4e) and 3-1-(prop-2-ynyl)(5-methoxy-1H-indol-3-yl)-3(1H-indol-3-yl)indolin-2-one (5e) are reported here for the first time. All the compounds are characterized by IR, 1H, 13C NMR and HRMS.
Modeling and simulation of Microstrip patch array for smart antennas
K.Meena alias Jeyanthi,A.P.Kabilan
International Journal of Engineering , 2010,
Abstract: The aim of the paper is two fold. One is to design and simulate an antenna array suitable for wireless applications and the other is the design of beamforming algorithm. In this paper, the first module presents the design of multiple microstrip rectangular patch elements suitable for beamforming technique in wireless applications in the range of 1.8 - 2.4 GHz. By designing 1x8 patch array, it is possible to achieve 15 dB gain and 58% more directivity compared to the conventional patches. The second module suggests a NLVFF-RLS algorithm for beamforming technique to concentrate the power in the desired direction and nullify the power in the interferer direction with HPBW of 13dB.The results are analyzed for the scanning sector of -60° to 60°. The modeling and simulation of antenna array is obtained using Agilent’s ADS. The beamforming algorithm is designed in Matlab.
1-Chloroacetyl-2,6-bis(2-chlorophenyl)-3,5-dimethylpiperidin-4-one oxime
K. Ravichandran,P. Ramesh,M. Rani,S. Kabilan
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810018489
Abstract: In the title compound, C21H21Cl3N2O2, the piperidine ring adopts a distorted boat conformation. One of the chlorophenyl rings is almost perpendicular to the best plane through piperidine ring, making a dihedral angle of 88.7 (1)°, whereas the other ring is twisted by 71.8 (1)°. The crystal packing is stabilized by intermolecular C—H...O, C—H...Cl and O—H...O interactions.
Obedient Robot with Tamil Mother Tongue
N. Raju,N. Arjun,S. Manoj,K. Kabilan
Journal of Artificial Intelligence , 2013,
Abstract: In real time it is difficult to access certain places by humans. So, it is better to use a robot that can be controlled from a remote location using voice commands. Our project is to develop a voice based system that works with respect to the commands given in Run time. We are developing a Robot that is controlled by voice commands. The words are recognized using MATLAB. The voice commands include forward, reverse, left turn, right turn etc. After recognizing the words the commands are transmitted to an 8051Microcontroller based system through RF module and RS232 interface. The 8051 is, respectively programmed to control the motor connected to the robot. This project involves both signal processing and communication. The word recognition part is implemented by extracting the formants feature of the speech signals and the values are listed in an excel sheet database. Then, k-Nearest neighbor algorithm based classifier is used to compare the run time input voice with the database. The classifier output gives the word to which the voice command corresponds .The serial communication part involves the transmitting of data with respect to the command detected through an RF module working at 434 MHZ frequency. The data received at the receiver side is decoded and an 8051 based system is used for controlling the motors of the robot.
Distribution of cry and cyt Genes among Indigenous Bacillus thuringiensis Isolates with Mosquitocidal Activity  [PDF]
Ayyasamy Mahalakshmi, Kabilan Sujatha, Poornima Kani, Rajaiah Shenbagarathai
Advances in Microbiology (AiM) , 2012, DOI: 10.4236/aim.2012.23026
Abstract: Bacillus thuringiensis strains isolated from Madurai, TamilNadu, India were evaluated for their mosquitocidal activity, as well as cry and cyt genes diversity. It revealed that 99% of the parasporal crystal morphology of these isolates was spherical in nature and a variable percentage (0% - 100%) of toxicity was observed against Culex quinquefasciatus and Aedes aegypti. PCR analysis revealed that 53% of the isolates were positive for the various cry and cyt genes tested, whereas 47% did not produce any PCR product for the cry gene analyzed. Diverse pattern of cry and cyt genes distribution was observed even in the isolates from the same sample. B. thuringienis subsp. LDC-9 showed three-fold higher toxicity against Culex quinquefasciatus than that of B. thuringiensis var israelensis which might be used as a potential strain to control mosquitoes in near future after field evaluation.
Design of optical logic gates using self-collimated beams in 2D photonic crystal
X. Susan Christina,A. P. Kabilan
Photonic Sensors , 2012, DOI: 10.1007/s13320-012-0054-7
Abstract: Optical logic gates are elementary components for optical network and optical computing. In this paper, we propose a structure for AND, NAND, XNOR and NOR logic gates in the two dimensional photonic crystal which utilizes the dispersion based self-collimation effect. The self-collimated beam is splitted by the line defect and interfered with other self-collimated beam. This interference may be constructive or destructive based on their phase difference. This phenomenon is employed to realize all-optical logic gates. The gates are demonstrated numerically by computing electromagnetic field distribution using the finite difference time domain (FDTD) method. The results ensure that this design can function as AND, NAND, XNOR and NOR logic gates. The size of the structure is about 10 μm × 10 μm which in turn results in an increase in the speed and all the gates are realized in the same configuration. The ON-OFF contrast ratio is about 6 dB.
R. Ramachandran,M. Rani,S. Kabilan
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809005339
Abstract: In the title compound, C23H24N4OS, the piperidine and cyclohexane rings adopt twin chair conformations and the phenyl groups occupy equatorial positions. The dihedral angle between the two benzene rings is 10.25 (12)°. The crystal structure is stabilized by intermolecular N—H...O hydrogen bonds with the formation of centrosymmetric dimers.
Challenges Faced and the Strategies Adopted by a Malaysian English Language Teacher during Teaching Practice
Muhammad Kamarul Kabilan,Raja Ida Raja Izzaham
English Language Teaching , 2008, DOI: 10.5539/elt.v1n1p87
Abstract: In this paper, the reflections on distinct and crucial teaching practices of a pre-service English language teacher are presented and examined. The focus of this paper is on three aspects of class teaching that the teacher found presented a challenge during her teaching practice. For each aspect, the nature of the difficulties and the challenges are described and deciphered. In addition, various strategies that the teacher explored and experimented in order to meet those challenges are outlined and elucidated in terms of their effectiveness. This process is interwoven with the nurturing of pedagogical knowledge of the teacher, which is developed from her reflective practices. This paper also highlights some of the teacher’s plans and thoughts on dealing with those challenges in the future. Implications for teaching practice are also discussed.
Various Metal Sandwich Layer Oriented Efficiency Enhancement Superiority on CuInGaSe2 Thin Film Solar Cells  [PDF]
R. Kabilan, R. Ravi, A. Antony Christian Raja, T. Prem Kumar
Advances in Chemical Engineering and Science (ACES) , 2019, DOI: 10.4236/aces.2019.92013
Abstract: The good quality CuInGaSe2 (CIGS) thin film solar cells were fabricated on molybdenum metal coated soda lime glass substrate. Three-stage co-evaporation method was utilized for the fabrication of high quality p-type CIGS thin film absorber layer. Further, n-type CdS layer, high resistive intrinsic ZnO layer and transparent conducting AlZnO layers were fabricated by CBD method and vacuum sputtering methods. We made three various top metal sandwich grid patterns, i.e. Al, Al/Cu and Cu/Al which were utilized to investigate the metal sandwich layer oriented efficiency enhancement superiority on CuInGaSe2 thin film solar cells. The investigated specific CIGS solar cell device efficiency with respect to various top metal grid sandwich patterns is presented and discussed.
Pseudomonas sp. as a Source of Medium Chain Length Polyhydroxyalkanoates for Controlled Drug Delivery: Perspective
Sujatha Kabilan,Mahalakshmi Ayyasamy,Sridhar Jayavel,Gunasekaran Paramasamy
International Journal of Microbiology , 2012, DOI: 10.1155/2012/317828
Abstract: Controlled drug delivery technology represents one of the most rapidly advancing areas of science. They offer numerous advantages compared to conventional dosage forms including improved efficacy, reduced toxicity, improved patient compliance and convenience. Over the past several decades, many delivery tools or methods were developed such as viral vector, liposome-based delivery system, polymer-based delivery system, and intelligent delivery system. Recently, nonviral vectors, especially those based on biodegradable polymers, have been widely investigated as vectors. Unlike the other polymers tested, polyhydroxyalkanoates (PHAs) have been intensively investigated as a family of biodegradable and biocompatible materials for in vivo applications as implantable tissue engineering material as well as release vectors for various drugs. On the other hand, the direct use of these polyesters has been hampered by their hydrophobic character and some physical shortcomings, while its random copolymers fulfilled the expectation of biomedical researchers by exhibiting significant mechanical and thermal properties. This paper reviews the strategies adapted to make functional polymer to be utilized as delivery system.
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