V KAMALAKAR

@veltech.edu.in

Assistant professor Physics
Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology

V KAMALAKAR


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https://researchid.co/munikamal

RESEARCH INTERESTS

Atmospheric physics
Nanotechnology and Material science
18

Scopus Publications

Scopus Publications

  • Influence of four-wave mixing and Kerr nonlinearity on the instability gain spectrum of non-uniform PT-symmetric chirped FBG structure
    P. Mohanraj, A. Mani, Ancemma Joseph, A.M.S. Arulanantham, K. Dinesh Babu, V. Kamalakar
    Optik, 2025
  • Role of Higher-Order Scattering Coefficient and Residual Nonlinearities on Instability Criteria in Three-Body Bose-Einstein Condensates
    P. Mohanraj, R. Sivakumar, Jayaprakash Kaliyamurthy, V. Kamalakar, J. Gajendiran
    Journal of Optics and Photonics Research, 2025
    We examine the instability characteristics in a three-body condensate and the effect of higher-order nonlinear effects caused by shape-dependent imprisonment and higher-order scattering coefficients such as S-wave scattering length and effective range for collisions. Using the linear stability technique, we study the spreading relations and gain profile of the adapted Gross–Pitaevskii equation with higher-order scattering coefficients and enduring nonlinearity. The role of higher-order interactions S-wave scattering length, residual nonlinearity, and effective range for collisions over the modulational instability in immiscible and miscible three-body Bose-Einstein condensates has been discussed in detail. Modulational instability (MI) can be excited in miscible condensates and changed in immiscible condensates because of residual nonlinearity, without taking into account higher-order nonlinearity and three-body condensates. However, the results of this work demonstrate that the influence of higher-order residual nonlinearity can cause the MI to change in both immiscible and immiscible condensates. The discovered MI spectrum reveals a new soliton production regime in three-body condensates. The results exhibit that higher-order scattering coefficient and remaining nonlinearity interplay can successfully switch the instability gain profile in miscible and immiscible condensates. This makes it possible to regulate the dynamics by varying the MI in a ternary combination of Bose-Einstein condensates. Received: 19 December 2023 | Revised: 13 June 2024 | Accepted: 23 September 2024 Conflicts of Interest The authors declare that they have no conflicts of interest to this work. Data Availability Statement Data are available from the corresponding author upon reasonable request. Author Contribution Statement P. Mohanraj: Conceptualization, Methodology, Software, Writing – original draft. R. Sivakumar: Validation, Formal analysis, Investigation, Supervision. Jayaprakash Kaliyamurthy: Writing – review & editing, Visualization. V. Kamalakar: Writing – review & editing, Visualization. J. Gajendiran: Writing – review & editing, Visualization.
  • Effect of quintic nonlinearity and nonlocal effects on the modulation instability in oppositely directed couplers
    P. Mohanraj, Satyabrata Sahu, R. Sivakumar, K. Dinesh Babu, V. Kamalakar, Nafis Ahmad
    Physics Letters Section A General Atomic and Solid State Physics, 2025
  • Sustainability through digital twins optimizing energy usage and reducing waste
    G. Boopathy, V. Srinivasan, V. Kamalakar, G. Chandra Bose
    Accelerating Product Development Cycles with Digital Twins and Iot Integration, 2025
    Sustainability is drastically changing in the context of digital twins and the Internet of Things (IoT) because of the capacity to do operational optimization, predictive modeling, and real-time monitoring. This chapter looks at how digital twins generate virtual representations of physical assets where its IoT sensor data is integrated to improve energy efficiency and to reduce waste. Digital twins allow organizations to run through operations via simulation and to use the data underpinning the exercise to make data-driven decisions which minimise environmental impact and help support sustainability goals. By combining its technology with IoT, they make smarter energy management, predictive maintenance, and efficient production in a circular economy, and ultimately costs. These case studies and best practice are accompanied by research and an attempt to address challenges such as the incompatibility of data, and cost of adopting them. Results show how digital twins support the achievement of the United Nations Sustainable Development Goals (SDGs) and sustain industrial practices.
  • An Efficient Network and IoT System Architecture for Temperature and Relative Humidity Monitoring
    K. S. Balamurugan, Jyoti Dhanke, S. Karunakaran, Manka Manwal, J. Samson Isaac
    Technological Applications for Smart Sensors Intelligent Applications for Real Time Strategies, 2025
    This research presents an innovative real-time cardiac monitoring approach using NI myRIO-1900 and IoT cloud. The aim of the study is to develop a system that enables continuous monitoring of cardiac parameters, facilitating early detection of abnormalities and improving patient care outcomes. The research focuses on the design and implementation of a system 368 architecture that integrates the NI myRIO-1900 platform for data acquisition and processing, and the IoT cloud for real-time data transmission, storage, and analysis. The hardware and software components of the system are developed, and its performance is evaluated. The key findings indicate that the developed system demonstrates high accuracy, sensitivity, and specificity in detecting cardiac events, enabling early intervention and improving patient care. The integration of telemedicine capabilities allows for remote access and enhanced accessibility to specialized cardiac care. The research findings contribute to the advancement of cardiac monitoring technologies and provide valuable insights for future developments in this field. This realtime cardiac monitoring system has the potential to revolutionize healthcare by improving early detection, patient care, and accessibility to specialized services, ultimately leading to better patient outcomes and reduced healthcare costs.
  • Fabrication of Superalloys for High-Temperature Applications Using Microwave Route
    V. Srinivasan, G. Boopathy, J. V. Sai Prasanna Kumar, V. Kamalakar, P. Siva Prakasam
    Microwave Processing of Metallic Materials Revolutionizing Surface Engineering for Green Manufacturing, 2025
    Superalloys are required in vast amounts for high temperature domains such as aerospace, power generation, and automotives, and the need to introduce advanced fabrication methodologies that ensure greater scatter mechanical characteristic, improved oxidation resistance, and higher sustainability is growing rapidly. Processing of superalloys via conventional techniques is typically very energy intense and environmentally harmful. Novel microwave processing has been developed as a promising and environmentally friendly alternative approach for selectivity of heating, rapid heating, decreased processing time, and improvement of materials properties and sustainability. In this chapter, microwave-assisted sintering is investigated for producing superalloys at the level of key principles governing microwave material interactions. The discourse is aimed to bring forth the advantages of microwave processing over conventional route in terms of microstructure development, mechanical strength, and oxidation resistance. It is also shown in case studies and experimental evidence how this technique could be relevant for the production of high-performance superalloys based on refined grains and improved thermal stability. The challenges of uniform heating, material coherence, and scalability are further addressed by the chapter proposing means of overcoming these barriers. Microwave processing finds its place in superalloy fabrication via surface engineering, which relies upon it to advance green manufacturing initiatives. They provide an important basis for further studies and industrial application of microwaves in fabrication of high temperature materials.
  • An Investigation in Temperature Data Analysis of Middle Atmospheric Variation from SABER Satellite
    E. Raghavendrakumar, V. Kamalakar, K. Sunil Kumar
    Nature Environment and Pollution Technology, 2024
    This paper focuses on significant data analysis for middle atmospheric variations of height of 0 km 100 km. This data was downloaded from the SABER satellite NASA and analyzed with the help of MATLAB. The analysis includes the determination of propagation of wavelengths and oscillations for the semi-annual oscillation (SAO), Annual oscillations (AO), quasi-annual oscillations (QBO), EINIO southern oscillation (ENSO) from the period of Jan 2002 to Dec 2022 past twenty years data. The monthly mean Temperatures, monthly ozone deviations, and overall mean temperatures with standard deviations are estimated for the following altitude regions concerning troposphere (0-20km), stratospheric (21-50 km), mesospheric (51-90 km), and thermospheric regions (91-105 km). However, the results proved that the maximum temperature variations would affect the ozone depletion for the areas concerning the altitude height of 15-40 km region between troposphere and stratospheric in the temperature range of 260K, and average deviations are found in the order of 0.000010 μm for the troposphere region. The presence of harmful gases such as CO, CO2, NOx, H, and CH4 released from the automobile and powerplant industry may deplete the ozone layer and cause adverse effects.
  • Design of K-Type Propeller Optimized with Lightweight Aluminum Material and Its CFD Analysis for Marine-Based Applications
    K. Sunil Kumar, V. Kamalakar, S. Palani, Sumathy Muniamuthu, Carmel Mary Belinda
    Lecture Notes in Mechanical Engineering, 2024
  • SUSTAINABLE ENERGY INTEGRATION FOR SEAWATER DESALINATION
    Journal of Environmental Protection and Ecology, 2024
  • Recognition and Optimization of Wear Behaviour of Al 6081 with Polymeric Nanocomposites Using Machine Learning
    Jaidev Kumar, Sanjay R. Pawar, Ashish, V Kamalakar, R Karuppathal, Anup D Bhange
    Proceedings of the 4th International Conference on Smart Electronics and Communication Icosec 2023, 2023
    The Al 6081 alloy is broadly used in numerous engineering requests due to its excellent mechanical properties. However, its resistance of wear parameter is not satisfactory. In this study, the wear resistance of Al 6081 alloy reinforced with Graphene nanoplatelets (GNPs) at three different percentages (0.3%, 0.6%, and 0.9%) was investigated using Taguchi L27 array design. Machine learning techniques such as Signal to Noise ratio and Neural Networks were used to forecast the responses and optimize the wear behaviour of the Al 6081 alloy. The wear track was identified using Scanning Electron Microscopy (SEM) images. The results of the study indicate that the addition of GNPs improves the wear resistance of the Al 6081 alloy. The percentage of GNPs reinforcement that gives the best wear resistance is determined using the Taguchi L27 array design. It is found that 5% GNPs additives reduces the wear compared to other composition, 1% and 3%. This study provides a deeper understanding of the wear behaviour of Al 6081 alloy reinforced with GNPs and can be used as a reference for future research in this field. The use of machine learning techniques in this study provides a new approach for the optimization of wear behaviour in Al 6081 alloy reinforced with GNPs, which can be applied in various industrial applications. Overall, the consequences of this study validate that incorporating 0.9% GNPs in Al 6081 alloy is an operative way to advance its wear resistance properties.
  • Airglow measurements of wave damping at upper mesospheric altitudes over a low latitude station in India
    Indian Journal of Radio and Space Physics, 2013
  • Imaging of mesosphere-thermosphere airglow emissions over Gadanki (13.5°N, 79.2°E) - first results
    A. Taori, A. Jayaraman, V. Kamalakar
    Journal of Atmospheric and Solar Terrestrial Physics, 2013
  • On Rayleigh lidar capability enhancement for the measurement of short-period waves at upper mesospheric altitudes
    V. Kamalakar, A. Taori, K. Raghunath, S. V.B. Rao, A. Jayaraman
    International Journal of Remote Sensing, 2013
  • On the linkage between mesospheric gravity waves and occurrence of equatorial plasma bubble observed during the low solar activity
    Indian Journal of Radio and Space Physics, 2012
  • On the linkage of mesospheric planetary waves with those of the lower atmosphere and ionosphere: A case study from Indian low latitudes
    K. Niranjan Kumar, A. Taori, S. Sathishkumar, V. Kamalakar, R. Ghodpage, S. Gurubaran, P. T. Patil, S. V. B. Rao, A. K. Patra
    Journal of Geophysical Research Space Physics, 2012
  • A new method to derive middle atmospheric temperature profiles using a combination of Rayleigh lidar and O 2 airglow temperatures measurements
    A. Taori, A. Jayaraman, K. Raghunath, V. Kamalakar
    Annales Geophysicae, 2012
  • Simultaneous Rayleigh lidar and airglow measurements of middle atmospheric waves over low latitudes in India
    A. Taori, V. Kamalakar, K. Raghunath, S.V.B. Rao, J.M. Russell
    Journal of Atmospheric and Solar Terrestrial Physics, 2012
  • First observation of upper mesospheric semi annual oscillations using ground based airglow measurements from Indian low latitudes
    A. Taori, V. Kamalakar, A. Jayaraman
    Advances in Space Research, 2012