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Search Results: 1 - 10 of 138921 matches for " K. Gopalan "
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Mass fractionation correction of spiked Sr and Nd ratios in dynamic triple collection
K. Gopalan
Chinese Science Bulletin , 1998, DOI: 10.1007/BF02891436
The Antisymmetry of Distortions
Brian K. VanLeeuwen,Venkatraman Gopalan
Physics , 2015, DOI: 10.1038/ncomms9818
Abstract: Distortions are ubiquitous in nature. Under perturbations such as stresses, fields, or other changes, a physical system reconfigures by following a path from one state to another; this path, often a collection of atomic trajectories, describes a distortion. Here we introduce an antisymmetry operation called distortion reversal, 1*, that reverses a distortion pathway. The symmetry of a distortion pathway is then uniquely defined by a distortion group involving 1*; it has the same form as a magnetic group that involves time reversal, 1'. Given its isomorphism to magnetic groups, distortion groups could potentially have commensurate impact in the study of distortions as the magnetic groups have had in the study of magnetic structures. Distortion symmetry has important implications for a range of phenomena such as structural and electronic phase transitions, diffusion, molecular conformational changes, vibrations, reaction pathways, and interface dynamics.
Adaptive Selection of Top-m Retrieval Strategies for Data Fusion in Information Retrieval
N.P. Gopalan,K. Batri
International Journal of Soft Computing , 2012,
Abstract: Data fusion for Information Retrieval (IR) usually combines various strategies (schemes) to enhance the performance. The process of selecting the top `m` strategies with appropriate weights has been presented in this study. Genetic Algorithm (GA) with relevant judgments obtained for the user specified queries as training data is employed for the adaptive selection of the suitable strategies. The significance of experimental results obtained with three benchmark test collections is examined using Student-t test. The present adaptive method has been observed to perform consistently well in comparison with the individual ones participating in the fusion.
Mobilising Community Participation For Combating Alcohol And Drug Dependance
Srinivasa D.K,Gopalan R
Indian Journal of Community Medicine , 1988,
Sm-Nd age of the ‘Piplia Kalan’ eucrlte
Anil Kumar,K. Gopalan,J. K. Zachariah,N. Bhandari
Chinese Science Bulletin , 1998, DOI: 10.1007/BF02891484
Temperature dependence of oxygen isotopic fractionation of CO2 from magnesite-phosphoric acid reaction
S. Das Sharma,D. J. Patil,K. Gopalan
Chinese Science Bulletin , 1998, DOI: 10.1007/BF02891405
Competent Smart Car Parking: An OSGi Approach
Kaushik Gopalan,K. Sairam,R. Nandakrishnan,Veeramuthu Venkatesh
Journal of Artificial Intelligence , 2013,
Abstract: In cosmopolitan expanses, parking of vehicles has become a major problem as it is becoming unproductive. It is also one of the key causes of city traffic congestion. A mechanism is needed to monitor the parking area. Other associated issues such as lighting of large parking lots and tracking availability of parking spots need to be addressed. The proposed study discussed these issues and gave a solution by employing Open Source Gate Initiative (OSGi), a middleware that helps in efficient communication. The parking system discussed here integrates various communication standards such as the SMS features of a standardized mobile, ZigBee enabled proximity sensors and a system meant for storage and processing of the data. The proposed architecture eliminates the hassles of searching empty parking spots and thus can save a lot of time on a daily basis for the general public who own and use a vehicle for commuting. The merits of this study compared with the existing models are emphasized here. This study also highlighted the advantages of using a standardized middleware such as OSGi for the communication between sensors and a system meant for the storage and processing of the obtained data.
Amplification of LDH gene from Indian strains of Plasmodium vivax
Ritu Berwal, N. Gopalan, Kshitij Chandel, Shri Prakash ,K. Sekhar
Journal of Vector Borne Diseases , 2006,
Abstract: Background & objectives: Plasmodium vivax is geographically widespread and responsible for >50% of malaria cases in India. Increased drug resistance of the parasite highlights the immediaterequirement of early and accurate diagnosis as well as new therapeutics. In view of this, the presentstudy was undertaken to amplify P. vivax (Indian strains) lactate dehydrogenase gene (PvLDH)which has been identified as a good target for antimalarials as well as diagnostics.Methods: P. vivax infected clinical blood samples were collected from southern part of India andwere tested with established diagnostic parameters (ICT, Giemsa staining). Total DNA was extractedfrom blood samples and subjected to PCR using two sets of primers, one for the amplification of fullPvLDH gene (951bp) and the other for a partial PvLDH gene fragment (422bp), covering a variableantigenic region (140aa) as compared to other plasmodial species.Results & conclusion: PCRs for both the full and partial gene targets were optimised and found to beconsistent when tested on several P. vivax positive clinical samples. In addition, full gene PCR wasfound to specifically detect only P. vivax DNA and could be used as a specific molecular diagnostictool. These amplified products can be cloned and expressed as a recombinant protein that might beuseful for the development and screening of antimalarials as well as for diagnostic purposes.
Double Antisymmetry and the Rotation-Reversal Space Groups
Brian K. VanLeeuwen,Venkatraman Gopalan,Daniel B. Litvin
Physics , 2013,
Abstract: Rotation-reversal symmetry was recently introduced to generalize the symmetry classification of rigid static rotations in crystals such as tilted octahedra in perovskite structures and tilted tetrahedral in silica structures. This operation has important implications for crystallographic group theory, namely that new symmetry groups are necessary to properly describe observations of rotation-reversal symmetry in crystals. When both rotation-reversal symmetry and time-reversal symmetry are considered in conjunction with space group symmetry, it is found that there are 17,803 types of symmetry, called double antisymmetry, which a crystal structure can exhibit. These symmetry groups have the potential to advance understanding of polyhedral rotations in crystals, the magnetic structure of crystals, and the coupling thereof. The full listing of the double antisymmetry space groups can be found in the supplemental materials of the present work and online at our website: http://sites.psu.edu/gopalan/research/symmetry/
Tables of crystallographic properties of double antisymmetry space groups
Mantao Huang,Brian K. VanLeeuwen,Daniel B. Litvin,Venkatraman Gopalan
Physics , 2013,
Abstract: Tables of crystallographic properties of double antisymmetry space groups, including symmetry element diagrams, general position diagrams, and positions, with multiplicities, site symmetries, coordinates, spin and roto vectors are presented.
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