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Institution

Indian Institute of Technology Guwahati

EducationGuwahati, Assam, India
About: Indian Institute of Technology Guwahati is a education organization based out in Guwahati, Assam, India. It is known for research contribution in the topics: Adsorption & Catalysis. The organization has 6933 authors who have published 17102 publications receiving 257351 citations.


Papers
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Journal ArticleDOI
TL;DR: In this paper, a higher order compact finite difference solution procedure has been proposed for the steady two-dimensional convection-diffusion equation on non-uniform orthogonal Cartesian grids involving no transformation from the physical space to the computational space.
Abstract: A higher order compact (HOC) finite difference solution procedure has been proposed for the steady two-dimensional (2D) convection–diffusion equation on non-uniform orthogonal Cartesian grids involving no transformation from the physical space to the computational space. Effectiveness of the method is seen from the fact that for the first time, an HOC algorithm on non-uniform grid has been extended to the Navier–Stokes (N–S) equations. Apart from avoiding usual computational complexities associated with conventional transformation techniques, the method produces very accurate solutions for difficult test cases. Besides including the good features of ordinary HOC schemes, the method has the advantage of better scale resolution with smaller number of grid points, with resultant saving of memory and CPU time. Gain in time however may not be proportional to the decrease in the number of grid points as grid non-uniformity imparts asymmetry to some of the associated matrices which otherwise would have been symmetric. The solution procedure is also highly robust as it computes complex flows such as that in the lid-driven square cavity at high Reynolds numbers (Re), for which no HOC results have so far been seen. Copyright © 2004 John Wiley & Sons, Ltd.

83 citations

Journal ArticleDOI
TL;DR: In this paper, a single pot synthesis of polyaniline nanoparticles and aniline composite nanoparticles was performed in a micellar medium using sodium dodecyl sulfate as the micelles.
Abstract: In this paper, we report a single pot synthesis of polyaniline nanoparticles and Au nanoparticle−polyaniline composite nanoparticles using vapor phase introduction of aniline monomer. The synthesis was carried out in a micellar medium using sodium dodecyl sulfate as the micelles. Also, H2O2 was used both to reduce HAuCl4 to Au nanoparticles and to polymerize aniline in the same pot. The particles were synthesized in the form of aqueous dispersion with particle sizes of about 100 nm. UV−visible absorption spectra indicated the formation of emeraldine salt form in both the PANI and the composite particles. FTIR spectra showed the formation of identical polymer in both the systems. Transmission electron microscopic investigation was carried out to measure particle sizes for both the cases. X-ray diffraction measurements showed the presence of Au in the composite in addition to indicating the formation of polyaniline with low crystalline phase in both the cases. Also, the electrical conductivity of the compos...

83 citations

Journal ArticleDOI
TL;DR: An improved method of Agrobacterium-mediated transformation of cowpea was developed employing both sonication and vacuum infiltration treatments, which increased the stable transformation efficiency by 88.4% and the presence, integration and expression of nptII and cry1Ac genes in T0 transgenic plants were confirmed.
Abstract: An improved method of Agrobacterium-mediated transformation of cowpea was developed employing both sonication and vacuum infiltration treatments. 4 day-old cotyledonary nodes were used as explants for co-cultivation with Agrobacterium tumefaciens strain EHA105 harbouring the binary vector pSouv-cry1Ac. Among the different injury treatments, vacuum infiltration and their combination treatments tested, sonication for 20 s followed by vacuum infiltration for 5 min with A. tumefaciens resulted in highest transient GUS expression efficiency (93% explants expressing GUS at regenerating sites). After 3 days of co-cultivation, the explants were cultured in 150 mg/l kanamycin-containing selection medium and putative transformed plants were recovered. The presence, integration and expression of nptII and cry1Ac genes in T0 transgenic plants were confirmed by polymerase chain reaction (PCR), genomic Southern and qualitative reverse transcription (RT)-PCR analysis. Western blot hybridization and enzyme-linked immunosorbent assay (ELISA) detected and demonstrated the accumulation of Cry1Ac protein in transgenic plants. The cry1Ac gene transmitted in a Mendelian fashion. The stable transformation efficiency increased by 88.4% using both sonication-assisted Agrobacterium-mediated transformation (SAAT) and vacuum infiltration than simple Agrobacterium-mediated transformation in cowpea.

83 citations

Proceedings ArticleDOI
20 Aug 2017
TL;DR: The main focus of this work is on exploiting the differences in the speech-specific nature of genuine speech signals and spoofed speech signals generated by replay attacks.
Abstract: This work describes the techniques used for spoofed speech detection for the ASVspoof 2017 challenge. The main focus of this work is on exploiting the differences in the speech-specific nature of genuine speech signals and spoofed speech signals generated by replay attacks. This is achieved using glottal closure instants, epoch strength, and the peak to side lobe ratio of the Hilbert envelope of linear prediction residual. Apart from these source features, the instantaneous frequency cosine coefficient feature, and two cepstral features namely, constant Q cepstral coefficients and mel frequency cepstral coefficients are used. A combination of all these features is performed to obtain a high degree of accuracy for spoof detection. Initially, efficacy of these features are tested on the development set of the ASVspoof 2017 database with Gaussian mixture model based systems. The systems are then fused at score level which acts as the final combined system for the challenge. The combined system is able to outperform the individual systems by a significant margin. Finally, the experiments are repeated on the evaluation set of the database and the combined system results in an equal error rate of 13.95%.

83 citations

Journal ArticleDOI
TL;DR: The overall findings indicated that glucan from L. plantarum DM5 can serve as a potential prebiotic additive for food products.

83 citations


Authors

Showing all 7128 results

NameH-indexPapersCitations
Jasvinder A. Singh1762382223370
Dipanwita Dutta1431651103866
Sanjay Gupta9990235039
Santosh Kumar80119629391
Subrata Ghosh7884132147
Rishi Raj7856922423
B. Bhuyan7365821275
Ravi Shankar6667219326
Ashutosh Sharma6657016100
Gautam Biswas6372116146
Sam P. de Visser6225613820
Surendra Nadh Somala6114428273
Manish Kumar61142521762
Mihir Kumar Purkait572679812
Ajaikumar B. Kunnumakkara5720120025
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
2023118
2022365
20212,032
20201,947
20191,866
20181,647