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658 results on '"Annapurna K"'

2. Warm White Light Emission from Dy3+-Doped Mixed Alkaline-Earth Zinc Silico-Aluminate Glass Under Ultra-Violet Excitation

Author

Mohapatra, Sushanta Kumar, Khan, Sultan, Das, Subrata, Annapurna, K., Ghosh, Arindam, Series Editor, Chua, Daniel, Series Editor, de Souza, Flavio Leandro, Series Editor, Aktas, Oral Cenk, Series Editor, Han, Yafang, Series Editor, Gong, Jianghong, Series Editor, Jawaid, Mohammad, Series Editor, Molla, Atiar R., editor, Kalyandurg, Annapurna, editor, and Parker, J. M., editor

Published
2024
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10. Simulation of Topology Based VANET Routing Protocols Using NS3

Author

Pathan, Mahabub Subhani, Annapurna, K., Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Ranganathan, G., editor, Bestak, Robert, editor, and Fernando, Xavier, editor

Published
2023
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16. Thermal, structural, and conductivity properties of As14Sb26S(60−x)–(AgI)x chalcogenide glasses.

Author

Prabhudessai, Akila G., Balaji, Sathravada, Prasad, Sakthi, Chahal, Shweta, Biswas, Kaushik, Ramesh, K., Yadav, Anupama, Chakraborty, Saswata, Kongar, Partha Sarathi, Chatterjee, Sayan, Dutta, Sutanu, Dasgupta, Rana, Sarkar, Pratik, and Annapurna, K.

Subjects
CHALCOGENIDE glass, SILVER iodide, GLASS construction, DIFFERENTIAL scanning calorimetry, GLASS transition temperature
Abstract

The present work describes the preparation of a new series of chalcogenide glasses in an As14Sb26S(60−x) (AgI)x system intending to explore its thermal, structural, optical, mechanical, and electrical properties. The differential scanning calorimetry results of the studied glasses show the sharp decrease in glass transition temperature (Tg) with the successive incremental inclusion of AgI in the composition, implying the structural changes in the glass network. A thorough Raman analysis corroborates the occurrence of changes in the glass network due to the formation of AsI3 units and Ag–S–As bonds with increasing AgI content. Also, structural changes can be reflected with the change in the optical bandgap (Eg) that was calculated using Tauc equations where it was found that Eg is in harmony with the observed structural variations of glasses. The studied glasses possess a transmittance window (∼0.68–12 μm) with transmittance above 60% in the mid-infrared region. These structural changes are closely related to the significant enhancement of conductivity of the present glasses from 10−8 to 10−6 S/cm at 373 K with a decrease in activation energies. Impedance spectra for the glass with highest AgI revealed the presence of two different relaxation processes. AC conductivity data followed an Arrhenius behavior as well as Jonscher's power law. The present work provides insights into glass network modifications due to silver iodide inclusion and its role in the enhancement of conductivity. [ABSTRACT FROM AUTHOR]

Published
2024
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18. Quality Assisted Spectrum Allocation in Cognitive NOMA Networks

Author

Varma, D. Prasanth, Annapurna, K., Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Nayak, Padmalaya, editor, Pal, Souvik, editor, and Peng, Sheng-Lung, editor

Published
2022
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20. Adaptive Clustering and Trust Aware Routing (ACTAR) for Wireless Sensor Networks in IoT Environments.

Author

Nagamani, Vadala and Annapurna, K.

Subjects
*TRUST, *CYBERTERRORISM, *INTERNET of things, *DATA transmission systems, *ENERGY consumption, *WIRELESS sensor networks
Abstract

The Internet of Things (IoT) has emerged as a revolutionary technology, connecting a vast number of people to the internet through various devices such as smartphones, laptops, sensors, and more. An essential component of IoT, the wireless sensor network (WSN), enables automation in processes like sensing, node monitoring, and data transmission. However, the full potential of IoT is hindered by cyber threats and unreliable communication. Although several security algorithms exist, they are not suitable for energy‐constrained sensor nodes. To address this issue, this paper proposes an energy‐efficient security mechanism called adaptive clustering and trust aware routing (ACTAR) for IoT‐WSNs. ACTAR operates in three phases: adaptive and hybrid clustering (AHC), multiobjective function‐based cluster head selection (MOCH), and trust aware routing (TAR). First, AHC utilizes a nonuniform clustering mechanism to categorize the network into nearby and distant clusters. Next, the selection of cluster heads is based on four metrics: coverage, communication cost, residual energy, and node proximity. Finally, TAR calculates the trust degree of sensor nodes by evaluating their direct and indirect behavior in terms of communication interactions and energy consumption. The node with the highest trust degree is selected as the next‐hop forwarding node, followed by the route with the highest trust degree. Extensive simulations of ACTAR demonstrate its performance in terms of malicious detection rate, false‐positive rate, residual energy, and packet delivery ratio. Comparative analysis shows that ACTAR outperforms existing methods, proving its superiority. [ABSTRACT FROM AUTHOR]

Published
2025
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21. Synthesis of the Central Nervous System Stimulant Prolintane.

Author

Fatima Zeenath, S., Rao, T. V., Annapurna, K., and Venkat Narsaiah, A.

Subjects
BIOACTIVE compounds, CENTRAL nervous system stimulants, DRYING apparatus, DOPAMINE uptake inhibitors, NORMAL-phase chromatography, ACYL chlorides
Abstract

The article discusses the synthesis of the central nervous system stimulant prolintane, a derivative of amphetamine used to treat narcolepsy and hyperactivity disorders. The synthesis of prolintane was achieved in four steps with good to excellent yields, starting from commercially available phenylacetyl chloride. The research aimed to improve existing synthetic routes by reducing costs, steps, and improving yields, contributing to the pharmaceutical importance of prolintane. [Extracted from the article]

Published
2025
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24. Timeout-Aware Inter-Queuing for QoS Provisioning of Real-Time Secondary Users in Cognitive Radio Networks

Author

Annapurna, K., Seetha Ramanjaneyulu, B., Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zhang, Junjie James, Series Editor, Chowdary, P. Satish Rama, editor, Chakravarthy, V.V.S.S.S., editor, Anguera, Jaume, editor, Satapathy, Suresh Chandra, editor, and Bhateja, Vikrant, editor

Published
2021
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37. Thermal, structural, and conductivity properties of As14Sb26S(60−x)–(AgI)x chalcogenide glasses

Author

Prabhudessai, Akila G., primary, Balaji, Sathravada, additional, Prasad, Sakthi, additional, Chahal, Shweta, additional, Biswas, Kaushik, additional, Ramesh, K., additional, Yadav, Anupama, additional, Chakraborty, Saswata, additional, Kongar, Partha Sarathi, additional, Chatterjee, Sayan, additional, Dutta, Sutanu, additional, Dasgupta, Rana, additional, Sarkar, Pratik, additional, and Annapurna, K., additional

Published
2024
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