Exploring the Impact of Disengagement on the Burnout Among ICU Nurses of Indian Private Hospitals: The Influence of Perceived Organization Support
Burnout; Disengagement; Perceived organisation support
Among healthcare workers, the nursing workforce has a high intensity of burnout which occurs as a response to the pressure they face at their workplace. Burnout in nursing professionalsis a widespread phenomenon characterized by a reduction in nurses energy that manifests in emotional exhaustion, lack of encouragement, and feelings of frustration and may lead to a decrease in work efficacy. This is a significant issue in human services that needs to be addressed.Several studies have been done on nurses; however, burnout in Indian ICU nurses has not received much attention. Intensive Care Units are specialized hospital areas requiring constant attention and vigorous patient care. Studies state that ICU nurses have to be more alert due to the severity of the illness in patients. Nurses in ICUs face many challenges at work which could lead to burnout. Disengagement is one such factor that might lead to burnout in nurses. When people experience disengagement, they feel detached from their workplace. Previous studies indicate that due to pandemic experiences, nurses are disengaging at a rate twice that of other healthcare staff. The challenging demands of their work have significantly affected the nurse's psychological wellness and overall health. Limited studies have been done on ICU nurse disengagement and its effect on burnout in Indian settings. Therefore, the study aims to examine how nurse disengagement affects the burnout they experience. Healthcare organizations must prioritize the support to be extended and care for the nurses well-being to prevent further disengagement. Nurses may become more committed to the organization when they feel supported by hospital administrators and have lighter workloads. This paper focuses on exploring the consequences of disengagement on burnout experienced by ICU nurses and the influence of Perceived Organizational Support (POS) between them. The sample used for the study was 449 nurses working in the ICU divisions of private hospitals in India. This study employed a simple random sampling technique. A survey was utilized and distributed to the nursing professionals working in the ICU divisions. The commonly recognized aspects of burnout are emotional exhaustion, depersonalization, and reduced personal achievement. The study results indicated that disengagement has no impact on the emotional exhaustion experienced by ICU nurses. However, it influences depersonalization and nurses achievement. The study results state that POS moderated the relationship between disengagement and the two burnout aspects: depersonalization and personal achievement. From the findings, it may be concluded that perceived organizational support is crucial in encouraging greater personal accomplishment, reduced depersonalization, and bringing about positive change for disengaged ICU nurses. Better organizational support for ICU nurses becomes a critical responsibility of nursing administration. The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.
Kamath, Radhika R; Kumar, Arti Arun; Seshadri, Vinita
Studies in Big Data;Volume;158;pp.111-126
Springer Science and Business Media Deutschland GmbH
Restricted Access; Hardcopy may be available in the library
https://doi.org/10.1007/978-3-031-70855-8_11 https://www.scopus.com/pages/publications/85209576708?origin=resultslist
Kamath R.R., Christ (Deemed to Be University), Bangalore, India; Kumar A.A., Christ (Deemed to Be University), Bangalore, India; Seshadri V., Christ (Deemed to Be University), Bangalore, India
Exploring the Effect of Work-Family Conflict on Burnout Among ICU Nurses in Indian Private Hospitals: The Influence of Perceived Organization Support
Burnout; Perceived organization support; Work-family conflict
Nursing is demanding and often clashes with family responsibilities causing significant Work-Family Conflict (WFC). Nurses have long shifts, emotionally demanding workloads, and deep patient involvement which strains their work-life balance. This conflict blurs the lines between work and home and depletes emotional resources leading to burnout symptoms: emotional exhaustion, depersonalization, and reduced accomplishment. Burnout happens when nurses try to juggle work demands with personal responsibilities, hence organizational support is needed. ICU and emergency environments are known to be high-stress and deeply impact nurses personal lives through WFC. This affects nurse health and family well-being, especially in the ICU setting. Perceived Organizational Support (POS) which is how valued and supported nurses feel by their employers plays a big role in mitigating these challenges. This study will look into how WFC contributes to burnout among ICU nurses and the buffering effect of POS. The study had 449 ICU nurses from private hospitals in India through simple random sampling. Surveys showed that WFC did not affect ICU nurses accomplishment but affected emotional exhaustion and depersonalization. POS was found to moderate these effects hence it plays a role in buffering burnout risk among ICU nurses. The results emphasized the need for strong organizational support in nursing administration to mitigate WFC and burnout. The study had 449 ICU nurses from private hospitals in India through simple random sampling. Surveys showed that work-family conflict did not affect ICU nurses accomplishment but affected emotional exhaustion and depersonalization. Perceived Organizational Support (POS) was found to moderate these effects hence it plays a big role in buffering burnout risk among ICU nurses. The results emphasized the need for strong organizational support in nursing administration to mitigate work-family conflict and burnout. The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.
Kamath, Radhika R.; Arun Kumar, Arti; Mathew, Sonia
Studies in Big Data;Volume;164;pp.511-524
https://doi.org/10.1007/978-3-031-75095-3_40 https://www.scopus.com/pages/publications/105002038265?origin=resultslist
Kamath R.R., Christ (Deemed to be University), Bangalore, India; Arun Kumar A., Christ (Deemed to be University), Bangalore, India; Mathew S., Christ (Deemed to be University), Bangalore, India
Enhancement of resilience an quality of life using strength based counselling and the mediating role of parental bonding in adolescents with type 1 diabetes
The current study was an attempt to understand the socio-demographic profile of newlineadolescents with type 1diabetes, the relationship between variables such as resilience, quality of life, parental bonding and the mediating role of parental bonding. It was also aimed to understand parent s perception of the adolescent s resilience and quality of life and their newlineexperiences. In phase 1, 100 adolescents/ newlinechildren (M=40, F=60, Age 10-18years) with an newlineexisting diagnosis of type 1 diabetes and their parents were enrolled from two hospitals and one clinic in Bangalore. The adolescents were administered Paediatric Quality Of Life for Diabetics (PedsQL) (Child and Adolescent Form), The Resilience Scale for Youth (CYRM), The Parental Bonding Instrument PBI (Father and Mother Form ). Parents were administered the consent form, demographic data sheet and parent version of resilience and quality of life.All scales were translated and back translated. In Phase 2 of the study, an intervention model based on the principles of strength newlinebased counselling to enhance resilience and quality of life (SBCTD1) was developed and newlineused. Qualitative interviews were conducted to understand the experiences of parents of newlinechildren/adolescents having type 1 diabetes. These interviews were tape recorded. 50 newlineadolescents from Phase1, were randomly assigned to the intervention group (n=25) and the control group (n=25). For the intervention group after going through the sessions the Resilience Scales and The Paediatric Quality of Life scales were administered after one and three months respectively. HbA1c values were also collected again after three months of newlineintervention. Control group received regular care and treatment at the center and were not newlineexposed to the model developed for the study.
The Influence of Family Environment and Peer Attachment on the Quality of Life of Adolescents
A Dynamic Anomaly Detection Approach for Fault Detection on Fire Alarm System Based on Fuzzy-PSO-CNN Approach
Convolutional Neural Network (CNN); Fire Alarm System; Particle Swarm Optimization (PSO)
Early detection is crucial due to the catastrophic threats to life and property that are involved with fires. Sensory systems used in fire alarms are prone to false alerts and breakdowns, endangering lives and property. Therefore, it is essential to check the functionality of smoke detectors often. Traditional plans for such systems have included periodic maintenance; however, because they don't account for the condition of the fire alarm sensors, they are sometimes carried out not when necessary but rather on a predefined conservative timeframe. They describe a data-driven online anomaly detection of smoke detectors, which analyzes the behavior of these devices over time and looks for aberrant patterns that may imply a failure, to aid in the development of a predictive maintenance approach. The suggested procedure begins with three steps: preprocessing, segmentation, and model training. A pre-processing unit can enhance data quality by compensating for sensor drifts, sample-to-sample volatility, and disturbances (noise). The proposed approach normalizes the data in preparation. The smoke source can be detected by using segmentation to differentiate it from the background. Following segmentation, Fuzzy-PSO-CNN is used to train the models. CNN and PSO, two of the most used alternatives, are both outperformed by the proposed method. 2023 IEEE.
Kanagaraj K.; Amruthaluru U.; Selvaganesan J.; Singh Y.; Janakiraman V.; Chauhan A.
International Conference on Sustainable Communication Networks and Application, ICSCNA 2023 - Proceedings, pp. 1124-1129.
Institute of Electrical and Electronics Engineers Inc.
Kanagaraj K., Srm Institute of Science and Technology, Department of Computational Intelligence, Chennai, India; Amruthaluru U., Vardhaman College of Engineering, Department of Cse, Telangana, India; Selvaganesan J., Veltech Rangarajan Dr Sagunthala R&d Institute of Science and Technology, Department of Electronics and Communication Engineering, Chennai, India; Singh Y., Mausam Bhawan, India Meteorological Department, New Delhi, India; Janakiraman V., Prince Shri Venkateshwara Padmavathy Engineering College, Department of Mechanical Engineering, Chennai, India; Chauhan A., School of Sciences, Christ (Deemed to Be University), Department of Life Sciences, Karnataka, Bengaluru, India
Enhancing Sustainable Urban Energy Management through Short-Term Wind Power Forecasting Using LSTM Neural Network
LSTM; short-term wind power forecasting; urban city energy management systems; wind energy forecasting
Integrating wind energy forecasting into urban city energy management systems offers significant potential for optimizing energy usage, reducing the carbon footprint, and improving overall energy efficiency. This article focuses on developing a wind power forecasting model using cutting-edge technologies to enhance urban city energy management systems. To effectively manage wind energy availability, a strategy is proposed to curtail energy consumption during periods of low wind energy availability and boost consumption during periods of high wind energy availability. For this purpose, an LSTM-based model is employed to forecast short-term wind power, leveraging a publicly available dataset. The LSTM model is trained with 27,310 instances and 10 wind energy system attributes, which were selected using the Pearson correlation feature selection method to identify crucial features. The evaluation of the LSTM-based forecasting model yields an impressive R2 score of 0.9107. The models performance metrics attest to its high accuracy, explaining a substantial proportion of the variance in the test data. This study not only contributes to advancing wind power forecasting, but also holds promise for sustainable urban energy management, enabling cities to make informed decisions in optimizing energy consumption and promoting a greener, more resilient future. 2023 by the authors.
Kanagarathinam K.; Aruna S.K.; Ravivarman S.; Safran M.; Alfarhood S.; Alrajhi W.
Sustainability (Switzerland), Vol-15, No. 18
Multidisciplinary Digital Publishing Institute (MDPI)
https://doi.org/10.3390/su151813424 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85172864555&doi=10.3390%2fsu151813424&partnerID=40&md5=c9615f35f0b9e0b7ac70a0f67273dba5
Kanagarathinam K., Department of Electrical and Electronics Engineering, GMR Institute of Technology, Rajam, 532127, India; Aruna S.K., Department of Computer Science and Engineering, School of Engineering and Technology, CHRIST (Deemed to be University), Bangalore, 560029, India; Ravivarman S., Department of Electrical and Electronics Engineering, Vardhaman College of Engineering, Shamshabad, 501218, India; Safran M., Department of Computer Science, College of Computer and Information Sciences, King Saud University, P.O. Box 51178, Riyadh, 11543, Saudi Arabia; Alfarhood S., Department of Computer Science, College of Computer and Information Sciences, King Saud University, P.O. Box 51178, Riyadh, 11543, Saudi Arabia; Alrajhi W., Department of Computer Science, College of Computer and Information Sciences, King Saud University, P.O. Box 51178, Riyadh, 11543, Saudi Arabia
Betel leaf-mediated zinc oxide nanoparticle-coated silk fibres: a sustainable approach for biomedical applications
Clinical management of surgical site infections remains a challenge in biomedicine, where novel wound dressing materials are tested with a plethora of features. Here we describe a green and sustainable route to prepare biogenic zinc oxide nanoparticles (BZnONPs) using Piper betle leaf extract, which acts as a green reducing and stabilising agent. These biosynthesised nanoparticles were then used for the functional coating of degummed Bombyx mori silk fibers. Physico-chemical characterisation supports the efficient synthesis of crystalline, nanosized, and colloidal stable BZnONPs. The functionalization of silk fibers with BZnONPs resulted in the enhancement of the mechanical properties, tensile strength, and elasticity. Antibacterial testing proved the capability of the functional fibers against the strain Staphylococcus aureus. The as-synthesised fibers were biocompatible towards normal blood components, normal cells and exhibited slight toxicity toward cancer cells. Enhanced mechanical properties, antimicrobial action, and biocompatibility make BZnONP-coated silk fibers a leading player in various advanced biomedical devices, including sutures, wound dressings, tissue engineering scaffolds, and localised therapeutic platforms. Hence, this green nanotechnology approach opens up an alternative pathway toward the fabrication of multifunctional biomaterials with high translational value. 2025 The Royal Society of Chemistry.
Kanalli, Prakruthi; Kundapur, Rohan R.; Joseph, Manu M.
RSC Advances;Volume;15;Issue;38;pp.31162-31175
All Open Access; Gold Open Access; Green Open Access
https://doi.org/10.1039/d5ra03600c https://www.scopus.com/pages/publications/105014610505?origin=resultslist
Kanalli P., Department of Life Sciences, CHRIST University, Karnataka, Bengaluru, 560029, India; Kundapur R.R., Department of Life Sciences, CHRIST University, Karnataka, Bengaluru, 560029, India; Joseph M.M., Department of Life Sciences, CHRIST University, Karnataka, Bengaluru, 560029, India
Python Driven Keyword Analysis for SEO Optimization
Content marketing; Domain relevancy; Google Autocomplete; Insights; Keyword research; Product development; Python; Real-time data; Search engine optimization (SEO); Trends
Every word or string of words a user types into a search engine has meaning. For example, a user might search for a 'hotel' or a 'hotel in New York City.' Keywords are the standard focus of search engine optimization (SEO), which offers a useful method of gauging demand for specific queries and aiding in a better understanding of how users look for goods, services, businesses, and, eventually, solutions. Any effective SEO strategy must include keyword research, and Python is a strong language that can be used to automate and accelerate the process. This project presents a Python-based keyword research tool that works on real-time data to identify the top searches over a user-specified domain to identify trends and customer needs. It does this by utilizing multiple Python libraries and Google Autocomplete. The Google Autocomplete results for the user-specified domain are first parsed by the tool before it can function. After that, unnecessary keywords are eliminated by filtering and cleaning the results. Subsequently, the remaining keywords are arranged for search volume and domain relevancy. The tool looks for trends by comparing the current keyword rankings with previous data. Thanks to this, users can see which keywords are growing in popularity. By identifying the most commonly asked questions and issues, the tool also offers insights into the needs of its users. The tool is simple and adaptable to each user's unique requirements. It can be used to create keyword lists for content marketing, SEO, and product development, among other uses. 2024 IEEE.
10th International Conference on Advanced Computing and Communication Systems, ICACCS 2024, pp. 1170-1176.
https://doi.org/10.1109/ICACCS60874.2024.10717132 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85208626488&doi=10.1109%2fICACCS60874.2024.10717132&partnerID=40&md5=47f383dee48888ea46db26a9d41fb7f9
Kanara A.P., Christ (Deemed to be University), Computer Science Engineering (Specialization in Data Science), Banglore, India; Kumari P., Christ (Deemed to be University), Computer Science Engineering (Specialization in Data Science), Banglore, India; Prathap B.R., Christ (Deemed to be University), Computer Science Engineering (Specialization in Data Science), Banglore, India
A conceptual study on the impact of COVID-19 awareness campaigns by social media influencers on brand awareness
Covid 19 has severally affected various people across the world. Undoubtedly, a campaign on forming awareness of the pandemic among people is very important in order to curb the transmission from individual to individual. In this regard, social media influencers have played a significant role in many awareness campaigns organized by companies and the World Health Organization (WHO) because of their popularity and influence among the audience. Social media influencer campaigns on awareness of the pandemic conducted during this period have generated audience engagement. Moreover, it is vital to study the crucial factors that determine the creation of brand awareness among consumers related to influencer marketing campaigns on covid 19 awareness. This study has proposed a conceptual framework by integrating the variables from various theories. This research has incorporated variables such as awareness of covid 19, consumer engagement, physical health, mental health, and brand awareness. This study provides both theoretical and managerial implications. 2024, IGI Global.
Leadership Action and Intervention in Health, Business, Education, and Technology, pp. 142-154.
Kanaveedu A., School of Business and Management, Christ University, Bengaluru, India; Kalapurackal J.J., School of Business and Management, Christ University, Bengaluru, India
Influencer Marketing and Consumer Behaviour: A Systematic Literature Review
Consumer Behaviour; Persuasion; Psychological Factors; Social Media Influencer; Social Networking Sites
Influencer marketing is an emerging area in the field of marketing. Specifically, this topic grabs the attention of several academicians and practitioners because of the key role played by influencers to stimulate consumer behaviour. Significantly, a systematic way of analysing and summarising the works of literature in this nascent area is necessary. A systematic literature review provides a comprehensive overview of the whole literature studied. From this knowledge, a systematic literature review has been undertaken from the period of 2016 to 2021 based on 65 articles from the ABDC journal to fetch relevant research themes, methodology, theories, variables, antecedents and consequences and potential research gaps. From this information, this research proposed an integrative framework which depicts the role of social media influencers in activating consumer behaviour. Future research direction has presented comprising of knowledge gap in the existing literature from key areas such as theory, methodology and settings. This research provides implications for both theories and practice. 2022 Management Development Institute.
Kanaveedu A., School of Business and Management, CHRIST (Deemed to be University), Karnataka, Bangalore, India; Kalapurackal J.J., School of Business and Management, CHRIST (Deemed to be University), Karnataka, Bangalore, India
A conceptual framework for consumer engagement in social media influencer posts
Influencer marketing has received significant attention and is considered as the best way to build consumer engagement with the brand. However, research on Influencer marketing is burgeoning, and it is important to study the consumer behaviour associated with influencer marketing. Therefore, this study proposes a logical conceptual framework by integrating various construct such as ad recognition, informativeness, deceptiveness, irritation, entertainment, ad content value, and consumer engagement from various theories and provides implications for marketers to frame an effective marketing campaign and policymakers to formulate policies to protect consumers from deceptive advertising practice. 2024, IGI Global. All rights reserved.
Kanaveedu A.; Kalapurackal J.J.; Elangovan N.; Sinha M.
New Trends in Marketing and Consumer Science, pp. 72-88.
Kanaveedu A., School of Business and Management, Christ University, Bengaluru, India; Kalapurackal J.J., School of Business and Management, Christ University, Bengaluru, India; Elangovan N., School of Business and Management, Christ University, Bengaluru, India; Sinha M., School of Business and Management, Christ University, Bengaluru, India
WOW Skin Science: strategic adaptation for responsible advertising
Consumer behavior; Digital marketing; Regulations
Learning outcomes: After completing this case study, students will be able to understand the issues firms, brands and influencers face due to sponsorship disclosure regulation and the impact of self-regulation on firms engaging in influencer marketing, explain the challenges regulators face in ensuring compliance in an emerging market, explain Advertising Standard Council of India (ASCI)s challenges in adopting influencer guidelines from emerged markets and recommend ethical theory (or theories) and strategies to firms engaged in influencer marketing. Case overview/synopsis: This case study centers on Mr Manish Chowdhary, co-founder of WOW Skin Science, who started the beauty and personal care business with his brother Karan Chowdhary in 2015 in Bangalore, India. The company successfully built its brand through influencer marketing but faced challenges after the ASCI implemented new influencer guidelines. On May 31, 2021, he expressed disagreement with ASCI guidelines during an interview with Akansha Nagar from Buzz in Content, particularly the requirement to label every product or service received by influencers as an advertisement. He expressed concern about certain rules, fearing they might harm organic content and reduce viewership and followers. Subsequently, ASCI registered noncompliance cases against the company and communicated with them about complaints regarding influencer guideline violations. In this situation, Manish needed to evaluate his decision on noncompliance with regulation and required an action plan to strategically manage its influencer marketing campaign by incorporating ASCIs guidelines. Overall, this case study highlights the journey of WOW Skin Science and its challenges with self-regulatory authorities over its influencer marketing strategy in an emerging market. Additionally, students can gain insight into the marketing communication ethics of a startup operating in an emerging market by embodying the protagonists role. Complexity academic level: This case study is suitable for postgraduate level students pursuing a Master of Business Administration program. The difficulty level ranges from moderate to complex. It fits well into integrated marketing communication and marketing strategy courses. This case study discusses marketing ethics, advertising and promotion regulation. Supplementary materials: Teaching notes are available for educators only. Subject code: CSS 8: Marketing. 2024, Emerald Publishing Limited.
Kanaveedu A.; Kalapurackal J.J.; Elangovan N.; Sinha M.; Nagpal M.
Emerald Emerging Markets Case Studies, Vol-14, No. 3, pp. 1-32.
https://doi.org/10.1108/EEMCS-03-2024-0103 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85201807181&doi=10.1108%2fEEMCS-03-2024-0103&partnerID=40&md5=5e91984e895780228cde034821cdcda4
Kanaveedu A., School of Business and Management, Christ University, Bengaluru, India; Kalapurackal J.J., School of Business and Management, Christ University, Bengaluru, India; Elangovan N., School of Business and Management, Christ University, Bengaluru, India; Sinha M., School of Business and Management, Christ University, Bengaluru, India; Nagpal M., Department of Marketing, Indian Institute of Management Bangalore, Bangalore, India
Bio-Compatible CMOS-IC Based Obstacle Detection System Using IoT with ML Integration for Assistive Wearable Devices
1D-CNN; ESP32 microcontroller; IR Sensor; Random Forest; Skin-Embedded CMOS IC
The proposition presents an IoT-based skin-embedding assistive obstacle detection system for the visually impaired and elderly, integrating bio-compatible semiconductor material, infrared sensing, and cloud-based intelligence. The system comprises an embedded infrared sensor within a bio-compatible CMOS IC powered via an inductive NFC charger, with real-time data transmission to the Blynk mobile application using an external ESP32 BLE module. When obstacles are detected, the application provides immediate feedback through vibration or audio alerts. Simultaneously, the real-time readings are exported to Blynk Cloud for further analysis. The collected data can later be processed and analyzed using Python libraries TensorFlow and sklearn, employing Machine Learning models like 1D-CNN and CNN+RF to improve pattern prediction accuracy and optimize alert responsiveness. By integrating NFC-powered CMOS ICs with Bluetooth-Enabled infrared sensing, the design ensures minimal energy consumption and environmental impact. The machine learning algorithms accurately help in obstacle detection, making the system reliable with independent mobility and enhanced safety for individuals with visual, auditory, or cognitive impairments. 2025 IEEE.
Kanchan, S Maria Alice; Jose, Deepa V; Singh, Shivangi
2025 IEEE 7th International Conference on Computing, Communication and Automation, ICCCA 2025;
https://doi.org/10.1109/ICCCA66364.2025.11325666 https://www.scopus.com/pages/publications/105035151135?origin=resultslist
Kanchan S.M.A., Christ University, Dept. Computer Science, Karanataka, Bengaluru, India; Jose D.V., Christ University, Dept. Computer Science, Karanataka, Bengaluru, India; Singh S., Christ University, Dept. Computer Science, Karanataka, Bengaluru, India
Influence of Two-Frequency Rotational Modulation on the Dynamics of the Rayleigh-Bard Convection in Water-Based Nanoliquids with Either AA7072 or AA7075 Nanoparticles
Aluminum alloy; nanoliquid; Rayleigh-Bard convection; rotation modulation; two-frequency modulation
The effect of time-periodic two-frequency rotation modulation on Rayleigh-Bard convection in water with either AA7072 or AA7075 nanoparticles is investigated. The single-phase description of the Khanafer-Vafai-Lightstone model is used for modeling the nanoliquids. An asymptotic expansion procedure is adopted in the case of the linear stability to obtain the correction (due to modulation) to the Rayleigh number at marginal stability of unmodulated convection. A nonlinear regime of convection is considered with a nonautonomous generalized Lorenz model as the governing equation. The method of multiscales is then employed to obtain the coupled nonautonomous Ginzburg-Landau equations with cubic nonlinearity from the Lorenz model. These equations are presented in the phase-amplitude form and the amplitude is used to quantify the heat transport. The modulation amplitude is considered to be small (of order less than unity) and moderate frequencies of modulation are considered. We found that there is a threshold frequency beyond which the system behavior reverses. At frequencies below the threshold, the mean Nusselt number increases with an increase in the amplitude of modulation while an opposite influence is seen for values above the threshold. Such a behavior is a consequence of what is analogously seen in the case of the critical Rayleigh number. The influence of two-frequency modulation is more pronounced on the results of the linear and nonlinear regimes compared to that of the single-frequency one. The heat transport is enhanced due to the presence of dilute concentration of suspended nanoparticles (either AA7072 or AA7075 nanoalloys) in water. The influence of nanoparticles is to modify the threshold values generating chaos but it does not qualitatively alter the dynamical behavior of the system. The plots of Lyapunov exponents reveal that there is no possibility of hyper-chaos in the generalized Lorenz model when there is a rotational modulation. 2024 World Scientific Publishing Company.
Kanchana C.; Siddheshwar P.G.; Laroze D.
International Journal of Bifurcation and Chaos, Vol-34, No. 4
Kanchana C., Instituto de Alta Investigaci, Universidad de Tarapac Casilla 7 D, Arica, 1000000, Chile; Siddheshwar P.G., Centre for Mathematical Needs, Department of Mathematics, Christ (Deemed to Be University), Hosur Road, Bengaluru, 560029, India; Laroze D., Instituto de Alta Investigaci, Universidad de Tarapac Casilla 7 D, Arica, 1000000, Chile
Control of chaos in Darcy-Bard axisymmetric convection in a cylindrical enclosure using a uniform vertical cross-flow
The linear and weakly nonlinear stability analyses of Darcy-Bard convection of a Newtonian fluid experiencing a uniform vertical cross-flow is investigated in the paper for various aspect ratios. Making use of the Maclaurin series representation, an expression for axial eigenfunctions is obtained with the radial eigenfunction being a Bessel function of first kind. These eigenfunctions are influenced by the Peclet number, Pe, the non-dimensional number that signifies the rate of vertical cross-flow. The modified-Vadasz-Lorenz model obtained in this paper has newly defined non-dimensional parameters that capture the influence of vertical cross-flow. From the linear stability analysis, it is found that the effect of introducing vertical cross-flow is to stabilize the system. Using a weakly nonlinear stability analysis, the closed-form expression of the Hopf-Rayleigh number as a function of Pe is obtained. Furthermore, the behavior of the modified-Vadasz-Lorenz model is analyzed using the largest Lyapunov exponent and the bifurcation diagram. This gives information about the intensity of chaos and occurrence of the periodic motion. We observe that the influence of vertical cross-flow is to increase the value of the Hopf-Rayleigh number and thereby to delay the onset of chaos. Furthermore, the appearance of the first periodic point is preponed due to the vertical cross-flow. As the rate of vertical cross-flow increases, the intensity of chaos decreases, thereby indicating that the effect of introducing vertical cross-flow is to suppress chaos. 2024 Author(s).
https://doi.org/10.1063/5.0191080 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85188027024&doi=10.1063%2f5.0191080&partnerID=40&md5=fa00876d0153aad2f8e56d694f40ac94
Kanchana C., Instituto de Alta Investigaci, Universidad de Tarapac Casilla 7 D, Arica, 1000000, Chile; Siddheshwar P.G., Center for Mathematical Needs, Department of Mathematics, CHRIST (Deemed to be University), Bengaluru, 560029, India; Laroze D., Instituto de Alta Investigaci, Universidad de Tarapac Casilla 7 D, Arica, 1000000, Chile
Control of chaos and intermittent periodic motions in Rayleigh-Bard convection using a feedback controller
Chaos; Feedback controller; Meclaurin series; Periodic motion; Rayleigh-Bard convection
Control of regular convective motion, chaos and periodic motion in the Rayleigh-Bard system is studied by considering a feedback control mechanism that considers the dependence of the heating (cooling) of the two boundary plates on one another. This set up ensures that the different flow regimes (convective, chaotic and periodic) in the system have no mechanical interference and the control remains an external mechanism. The rheostatic influence of feedback control on these flows is demonstrated by investigating in detail the critical Rayleigh number in the case of regular convective motion and the Hopf-Rayleigh number in the case of chaotic motion. For mild coupling between lower and upper boundary temperatures, periodic motions are intermittently observed in an otherwise chaotic regime at times when the system arrives at a situation (fuelling zone) wherein it needs to conserve energy in order to sustain chaos at subsequent times. For strong coupling between the boundary temperatures, an interesting situation arises wherein chaos makes a delayed and brief appearance and gives way to a prolonged spell of periodic motion. Features of the classical Rayleigh-Bard system are retained but each regime makes a delayed appearance. The Author(s), under exclusive licence to Springer Nature B.V. 2024.
Springer Science and Business Media B.V.
Kanchana C., Instituto de Alta Investigaci, Universidad de Tarapac Casilla 7 D, Arica, 1000000, Chile; Siddheshwar P.G., Centre for Mathematical Needs, CHRIST (Deemed to be University), Hosur Road, Bengaluru, 560029, India; Laroze D., Instituto de Alta Investigaci, Universidad de Tarapac Casilla 7 D, Arica, 1000000, Chile
Comparison of the effect of suction-injection-combination on Rayleigh-Bard convection in the case of asymmetric boundaries with those of symmetric ones
The effect of suction-injection-combination (SIC) on the linear and weakly nonlinear stability of Rayleigh-Bard convection is considered in the paper for the cases of symmetric and asymmetric boundary conditions. Using the Maclaurin series with an appropriate number of terms, expression for eigenfunctions is obtained. The linear theory corroborates the results obtained using the chosen eigenfunctions in the limiting case of the no-SIC effect by matching accurately with the exact values concerning the critical Rayleigh number (Rac) and the wave number (?c). It is found that the effect of SIC is to stabilize the system in the case of symmetric boundaries irrespective of SIC being pro-gravity or anti-gravity. However, the effect of SIC is to stabilize/destabilize the system depending on SIC being pro-gravity or anti-gravity in the case of the asymmetric boundaries. We also noted a similar effect in the case of ?c wherein a maximum error of order 10 ? 4 was observed. The main novelty of the present work is studying the influence of SIC on the nonlinear dynamics of the considered problem. It is shown that the effect of SIC is to hasten the onset of chaos. Using various indicators (the largest Lyapunov exponent, the time series solution, the amplitude spectrum, and the phase-space plots), the dynamical behavior of the system is analyzed and the influence of SIC on the dynamics is recorded. The change due to the boundary effect and the SIC on the size of convection rolls and the trapping region where the dynamical system evolves within a bound is highlighted in the paper. 2023 Author(s).
Kanchana C.; Siddheshwar P.G.; Pez L.M.; Laroze D.
https://doi.org/10.1063/5.0146657 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85159786556&doi=10.1063%2f5.0146657&partnerID=40&md5=fffa2703afc2330ee0d1d9b189a2f081
Kanchana C., Instituto de Alta Investigaci, CEDENNA, Universidad de Tarapac Casilla 7 D, Arica, Chile; Siddheshwar P.G., Center for Mathematical Needs, Department of Mathematics, CHRIST(Deemed to be University), Bengaluru, 560029, India; Pez L.M., Departamento de Fica, FACI, Universidad de Tarapac Casilla 7 D, Arica, 1000000, Chile; Laroze D., Instituto de Alta Investigaci, CEDENNA, Universidad de Tarapac Casilla 7 D, Arica, Chile
Convective heat and mass transports and chaos in two-component systems: comparison of results of physically realistic boundary conditions with those of artificial ones
Double-diffusive convection; Lorenz model; Nusselt number; Rigid boundaries; Sherwood number
Linear and weakly nonlinear stability analyses of double-diffusive convection in two-component liquids with either potassium chloride (KCl) or sodium chloride (NaCl) aqueous solution, and heat being present is investigated in the paper for free, and rigid, isothermal, iso-solutal boundaries. Using the thermophysical values of the aqueous solutions, we have shown that the stationary convection is the preferred mode at onset and that sub-critical motion is possible. We found that the critical thermal Rayleigh number for water+NaCl+heat is higher compared to that of water+KCl+heat. The study shows that for water+KCl+heat, the transition from convective motion to chaotic motion occurs at rH= 27.2 for free boundaries and at 48.5 for rigid boundaries. Here, rH denotes the Hopf thermal Rayleigh number. Further, the existence of windows of mildly chaotic points and fully periodic intervals are reported using Lyapunov exponents and bifurcation diagrams. Chaotic motions in both the aqueous solutions are nearly identical. The percentage increase in heat transport in the double-diffusive system involving NaCl is nearly 1% more than that of KCl in the case of free boundaries, whereas in the case of realistic boundaries it is nearly 1.6%. The comparison of the Nusselt and the Sherwood numbers between water+KCl and water+NaCl leads us to the conclusion that the aqueous solution with lower Lewis number transports maximum heat in the case of free boundaries and opposite is seen in the case of rigid boundaries due to the boundary effect. The many qualitative similarities between the results of artificial and realistic boundaries are highlighted. 2021, Akadiai Kiad Budapest, Hungary.
Kanchana C.; Siddheshwar P.G.; Shanker B.; Laroze D.
Journal of Thermal Analysis and Calorimetry, Vol-147, No. 4, pp. 3247-3266.
Kanchana C., Instituto de Alta Investigaci, CEDENNA, Sede Esmeralda, Universidad de Tarapac Av. Luis Emilio Recabarren, Iquique, 2477, Chile; Siddheshwar P.G., Department of Mathematics, CHIRST (Deemed to be University), Bengaluru, 560029, India; Shanker B., Department of Mathematics, CVR College of Engineering, Ranga Reddy District, Telangana, Ibrahimpatnam, 501510, India; Laroze D., Instituto de Alta Investigaci, CEDENNA, Sede Esmeralda, Universidad de Tarapac Av. Luis Emilio Recabarren, Iquique, 2477, Chile, Instituto de Alta Investigaci, CEDENNA, Universidad de Tarapac Casilla 7D, Arica, Chile
The effect of boundary conditions on the onset of chaos in RayleighBard convection using energy-conserving Lorenz models
Chaos; FourierGalerkin; Hopf bifurcation; Lorenz model; RayleighBard convection; StuartLandau equation
The influence of 16 boundary conditions on linear and nonlinear stability analyses of RayleighBard system is reported. A StuartLandau amplitude equation for the RayleighBard system between stress-free, isothermal boundary conditions is derived and the procedure used in this derivation serves as guidance for constructing an appropriate FourierGalerkin expansion for the other 15 boundary conditions to derive a generalized Lorenz model. The influence of the boundary conditions comes within the coefficients of the generalized Lorenz model. It is shown that the obtained generalized Lorenz model is energy conserving and for certain boundary conditions it retains features of the classical Lorenz model. Further, the principle of exchange of stabilities is shown to be valid for the present problem and hence it is the steady-state, linearized version of the generalized Lorenz model which yields an analytical expression for the Rayleigh number. On minimizing this expression with respect to wave number the critical Rayleigh number at which the onset of regular convective motion occurs in the form of rolls is determined for all 16 boundary conditions. It is found that these values are in good agreement with those of previous investigations leading to the conclusion that the chosen minimal FourierGalerkin expansion is a valid one. Exhibition of chaotic motion in the generalized Lorenz system at the Hopf Rayleigh number is studied. The phase-space plots which indicate a clear-cut visualization of the transition from regular convective motion to chaotic motion in the generalized Lorenz system are presented. Further, existence of a developing region for chaos (mildly chaotic motion) and windows of periodicity are captured using the bifurcation diagrams. It is concluded from the phase-space plots and the bifurcation diagrams that the generalized Lorenz model for certain sets of boundary conditions retains all the features of the classical Lorenz model. Such a conclusion cannot be made by a linear stability analysis and the need thus for a nonlinear analysis is highlighted in the paper. 2020 Elsevier Inc.
Applied Mathematical Modelling, Vol-88, pp. 349-366.
https://doi.org/10.1016/j.apm.2020.06.062 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85087996083&doi=10.1016%2fj.apm.2020.06.062&partnerID=40&md5=7ad2dc8372e77f283da13d3926bc50f0
Kanchana C., Harbin Institute of Technology, Shenzhen, Nanshan District, Shenzhen, 518055, China; Siddheshwar P.G., CHRIST(Deemed to be University), Bengaluru, 560056, India; Yi Z., Harbin Institute of Technology, Shenzhen, Nanshan District, Shenzhen, 518055, China