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Single-Stage Bidirectional Three-Level AC/DC LLC Resonant Converter with High Power Factor
The increasing demand for efficient and high-performance power converters in electric vehicle technology and renewable energy integration has brought attention to LLC resonant converters due to their advantages in soft switching, inherent short circuit and open circuit protection, and high efficiency. These converters are particularly well-suited for high-frequency operation, making them ideal for electric vehicle battery charging and other power conversion tasks. However, when integrated with a front-end boost power factor correction (PFC) stage in AC-DC applications, challenges arise in maintaining power balance during transients, leading to voltage fluctuations and potential operational instability. Moreover, light load conditions can result in excessive switching frequencies, causing elevated switching losses and control difficulties. Additionally, traditional LLC resonant converters face limitations related to high voltage stress on switches, which affects device reliability and overall converter performance. To address these issues, researchers have explored the use of multilevel inverters, but they introduce complexity and cost. In this context, this paper proposes a novel single-stage, three-level bidirectional AC-DC LLC-based resonant converter with features like zero voltage switching and duty ratio control for output voltage regulation. The converter achieves a unity displacement power factor naturally through discontinuous conduction mode. Simulation results demonstrate the converter's effectiveness of the proposed topology. The proposed converter offers a promising solution for Electric vehicle chargers, combining unity power factor operation and efficient bidirectional power flow control in a single topology. 2024 IEEE. -
On-board Converter for Electric Vehicle Charging using LCLC Resonant Topology
Due to their high efficiency, high power density, and soft switching characteristics, LLC-based AC-DC resonant converters are a great choice for EV chargers. Adding a capacitor across the magnetizing inductance of the LLC resonant architecture (LCLC configuration) enhances efficiency and reduces the need for a larger series inductor. The output DC voltage of the converter is generally regulated using switching frequency control. However, the power factor of the converter varies significantly with the switching frequency. As a result, any fluctuations in load may cause the converter to operate at a lower power factor. This paper proposes a single-stage topology based on the LCLC resonant structure. Zero voltage switching (ZVS) of the IGBTs used in the converter is ensured by the LCLC resonant configuration. Converter have a power factor correction (PFC) stage on the front of the converter to achieve natural power factor correction. Since the PFC stage and the resonant stage are controlled by the same switches, the converter is smaller and less costly. Simulations in MATLAB/Simulink are used to validate the topology. 2023 IEEE. -
LCLC Based AC-DC Single-Stage Resonant Converter with Natural Power Factor Correction
LLC-based AC-DC resonant converters make excellent EV chargers because of their high efficiency, high power density, and soft switching properties. Efficiency is increased and the need for a larger series inductor is lowered by connecting a capacitor across the magnetising inductance of the LLC resonant architecture (LCLC configuration). Switching frequency control is commonly used to regulate the converter's output DC voltage. However, there is a significant relationship between the converter's power factor and switching frequency. As a result, any changes in load may result in a lower power factor for the converter. This paper suggests a single-stage topology based on the LCLC resonant structure. The LCLC resonant configuration ensures zero voltage switching (ZVS) of the IGBTs used in the converter. Converters have a power factor correction (PFC) stage on the front of the converter to achieve natural power factor correction. Since the PFC stage and the resonant stage are controlled by the same switches, the converter is smaller and less expensive. A bridgeless rectification method is applied in the proposed topology to reduce the number of switching devices. MATLAB/Simulink simulations are used to validate the topology. 2023 IEEE. -
Green Finance and Sustainability: Landscape of Indian Financial Institutions
Today, green finance and sustainability have become integral parts of the global financial landscape, and it is the Indian financial institutions that are leading the way. This chapter delves into the intricate landscape of green finance and sustainability in Indian financial institutions. It focuses on regulation, green bonds, sustainable banking, public and private sector initiatives, and the challenges and opportunities they present. The Reserve Bank of India (RBI) and the Securities and Exchange Board of India (SEBI) are at the forefront of these initiatives. The RBI, for instance, is already taking significant steps, such as incorporating sustainability into its policy framework, by considering renewable energy in its priority sector lending norms. SEBI, conversely, has made it mandatory for all listed companies to disclose their ESG practices under the Business Responsibility and Sustainability Reporting (BRSR) framework, a move that promotes transparency and sustainable practices. Green bonds are a potent financial instrument for directing capital toward environmentally sustainable projects. In India, the Indian Renewable Energy Development Agency and several banks have proactively issued green bonds to finance renewable energy, energy efficiency, and clean transportation projects. The State Bank of Indias issuance of its first green bond in 2018, raising USD 650 million for a green project, is a testament to SBIs dedication to sustainable finance and a model for other financial institutions. Indian banks are increasingly integrating environmental, social, and governance (ESG) criteria, a set of standards for a companys operations that socially conscious investors use to screen potential investments in their lending and investment decisions fostering longterm green banking practices. They also provide green loans for projects with positive environmental impacts and incorporate climate risk assessment into their risk management frameworks driven by regulatory mandates and market demand for responsible investments. Both the public and private sectors in India are actively promoting green finance. The government provides support and technical know-how for fund arrangements for green projects through initiatives like the Green Climate Fund and the International Solar Alliance. Major corporations, including Tata Power and Reliance Industries, also invest heavily in renewable energy sources aligning with corporate sustainability trends. However, green financing in India still faces challenges. For instance, the general public is unaware of green financial products, which hampers their adoption. The limited number of such products and weak regulatory support pose significant hurdles. Despite these challenges, the potential for green finance in India is immense. The increasing recognition of climate change-related risks is driving demand for resilient investments. The progress in renewable energy and efficiency technologies is creating new investment opportunities, and international collaborations can enhance the capacity of Indian financial institutions to support green projects. Finally, the green finance and sustainability landscapes in Indian financial institutions are dynamic and changing rapidly. Regulatory systems, innovative financial instruments, sustainable banking practices, and proactive initiatives from public and private sectors collectively drive green finance growth and support by the countrys strive toward green financing of its transition to a sustainable and resilient economy. 2025 Scrivener Publishing LLC. -
The influence of environmentally mindful marketing tactics on the perceptual framework and predispositions of generation Z shoppers in the Indian app
Green marketing decisively helps businesses distinguish themselves from their competition, strengthen their image, and obtain the attention of consumers who increasingly prefer environmentally conscious businesses. By elevating a business's reputation and image, green marketing creates an effect on how people consider a brand and enhances customer loyalty and retention. The "green generation, " or Generation Z, is well-known for its sustainable product preferences and ecological concerns. The study analysed how green marketing techniques relate to and affect Gen Z customers' purchasing habits in India's garment industry. The study targeted 300+ Gen Z consumers through an online cross-sectional survey to get information on their perceptions of green brands, green marketing tactics, purchase intentions, and buying patterns. This study found that green marketing tactics used by fashion firms have a favorable impact and the ability to affect various aspects of customer behavior. 2024, IGI Global. All rights reserved. -
Alkali-activated concrete paver blocks made with recycled asphalt pavement (RAP) aggregates
This study was conducted to evaluate the feasibility of using recycled asphalt pavement (RAP) aggregates in alkali-activated concrete paver blocks. Due to drastic growth in road expansion projects in India, there is tremendous amount of RAP generated by milling and digging of existing bituminous roads. Even though RAP gets recycled in new bituminous roads, there is still large volume of this material that gets downgraded, especially in urban areas. Therefore, there is a need to effectively utilize the unused RAP in paving industry. Alkali-activated paver blocks were synthesized with fly ash (FLA), ground granulated blast furnace slag (GGBS), NaOH sol., Na2SiO3 sol., RAP and natural aggregates. Natural aggregates were substituted with RAP aggregates at replacement rates of 0 %, 25 %, 50 %, and 75 % by weight. The developed paver blocks were tested for water absorption, compressive strength, and abrasion resistance according to IS 15658: 2006 standard. The results of the laboratory study showed that inclusion of RAP aggregates in alkali-activated concrete reduce the compressive strength and abrasion resistance of the paver blocks. Though there is reduction in strength, developed paver blocks classified for use in pedestrian and non-motorized facility. The study also found that the use of RAP aggregates in paver blocks incur economic benefits. A maximum reduction of 25.8 % in production cost was observed for RAP inclusive alkali-activated paver blocks. Furthermore, the proposed method provides environmental benefits by reducing consumption of Portland cement and natural aggregates from quarries, and thus makes paving industry more sustainable and environment friendly. 2019 The Authors -
Geopolymer concrete paving blocks made with Recycled Asphalt Pavement (RAP) aggregates towards sustainable urban mobility development
Policy makers in India have realized the importance of facility for pedestrians and non- motorized vehicles in an urban infrastructure setup. This has resulted in increased utilization of construction materials like Portland cement and crushed stone, which are not environmentally friendly and sustainable. The current study presents the development of paver blocks for pedestrian facility using different wastes. Geopolymer concrete was synthesized by fly ash and recycled asphalt pavement aggregates for making of paver blocks. Paver blocks were produced in laboratory with recycled asphalt pavement aggregate replacement levels of 0%, 20%, 40%, 60% and 80% by weight of virgin coarse and fine aggregates. The developed paver blocks were tested for dimensions and tolerances, water absorption, compressive strength and abrasion resistance as per IS15658:2006 standard. The results of the laboratory study show that recycled asphalt pavement aggregates can be introduced into geopolymer matrix to produce paver blocks of desirable quality. Furthermore, its use in pedestrian facilities provides a new avenue for managing the excessive waste, which otherwise goes in landfills, incurring loss to the paving industry. Therefore, the proposed method can help decision makers to effectively utilize recycled asphalt pavement in paving industry with environment-friendly approach. 2020 The Author(s). This open access article is distributed under a Creative Commons Attribution (CC-BY) 4.0 license. -
In-plant production of bricks containing waste foundry sandA study with Belgaum foundry industry
The main objective of this study is to utilize waste foundry sand (WFS) from Belgaum foundry industry in manufacturing of bricks. The process involved production of bricks in a fully functioning brick manufacturing plant, which has a production capacity of approximately 50000 bricks per month. The entire process of combining clay-sand mixtures, forming of bricks, drying and firing was done with local conditions. With minimum process it was possible to introduce upto 50% WFS in clay bodies to produce bricks of desirable properties. The minimum average wet compression resistance of 3.3 Mpa, and maximum average water absorption of 21.6% was obtained for bricks containing 50% WFS, when fired at 900 C. There was insignificant difference in apparent porosity, water absorption, and specific gravity of bricks containing WFS, when compared to commercial bricks. The addition of WFS reduced the bulk density of the bricks, which has also caused reduction in compressive strength. WFS bricks can be classified as class III bricks, based on recommendations of IS 1077 standard specification. These bricks can be used in single storied load bearing structures, and also in the construction of infill walls in multi-storied framed structures. The structure, composition, and morphology of the raw materials, as well as bricks were studied by XRD, XPS, and SEM, respectively. 2018 The Authors -
Impact of Network Virtualization on Application Performance Metrics
The advent of network virtualization has redefined modern networking philosophies by allowing the partitioning of physical networks into virtual networks that are easily scalable, elastic, and efficient. The shift has been markedly critical to the function of applications in virtualized settings. This research examines the impact of network virtualization on key application performance indicators, including latency, throughput, packet loss, and resource utilization. The paper empirically assesses factors related to user experience and system performance by analyzing various virtualization technologies, including Software-Defined Networks (SDN), Network Functions Virtualization (NFV), and virtual overlay networks. The approach used entails deploying controlled benchmark applications on both virtualized and non-virtualized networks and measuring deviations from benchmark performance. Results indicate a strong correlation between the moderation of network performance overhead with virtualization and the presence of adaptive performance improvement schemes tailored to specific conditions. The efficiency of the hypervisor, placement of network functions, and orchestration policies significantly influence the responsiveness of the applications Additionally, the paper addresses the increasing scalability limitations of performance in cloud-native and edge-computing environments. There is a finding that indicates increased need for research 'effective intelligent resource management and adaptive network reconfiguration strategies in order to minimize latency and redundant bandwidth allocation bottlenecks'. 2025, Innovative Information Science and Technology Research Group. All rights reserved. -
Influence of basic need satisfaction, teacher self-efficacy, work-experience of teachers: Twenty-first-century skills instruction
The purpose of this study is to examine the influence of basic need satisfaction (BNS) and teacher self-efficacy (TSE), as well as work experience, on instructional outcomes related to twenty-first-century skills in schools. The rapidly evolving global landscape necessitates those teachers integrate twenty-first-century skills into classroom instruction. Despite a few studies on teachers ability to integrate innovative skills in instruction, limited empirical evidence exists regarding the influence of intrinsic motivation on the instruction of innovative pedagogical skills. Guided by Self-Determination Theory and Social Cognitive Theory, a conceptual model is developed to guide the influence on the instructional framework of twenty-first-century skills. Data are collected from 658 secondary school teachers across the southern states of India. For data collection, the study uses standardized instruments: the Teacher Sense of Efficacy Scale, the Basic Need Satisfaction at Work Scale, and the Twenty-First-Century Teaching and Learning Survey. The results of correlation, mediation, and moderation analyses have addressed the objectives of the study. Teacher self-efficacy shows different types of mediation effects on various components of basic need satisfaction, autonomy, competence, and relatedness, in its association with the instruction of twenty-first-century skills, which emphasizes their differential importance. Furthermore, work experience shows no moderation effect, suggesting the need for professional support for all teachers, regardless of experience. 2026 Conscientia Beam. All Rights Reserved. -
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Broken Romantic Relationships: Self-Forgiveness and Attitude Towards Marriage among Emerging Adults
he main aim of the study is to understand the relation between self- forgiveness and attitudes towards marriage, among emerging adults (18-25year olds) who have had a broken romantic relationship using the mixed method explanatory sequential research design. In Phase 1 of the study, 385 College students, (males and females) who had a romantic relationship breakup, were administered the tools for the quantitative part, using google survey, after receiving their consent. The data was subjected to statistical analysis. In Phase 2, an in-depth interview of five males and five females who volunteered, were interviewed in depth using a semi structured interview schedule, for a deeper understanding of the information obtained in Phase 1. The session that was of 60- 90 minutes duration was audio recorded and the data was subjected to Thematic Network Analysis. Findings of Phase 1 study indicates that there is a significant positive correlation between self- forgiveness and attitude towards marriage, except the financial aspect of marriage. Attitude towards marriage and forgiveness varied, based on certain aspects of the romantic relationship. Gender differences are present in certain aspects of attitude towards marriage. There is a positive and significant moderating role of gender in the relationship between dimensions of forgiveness with attitudes towards marriage. The relationship between self-forgiveness and intent to marry is positive and significant, especially for females. In Phase 2 of the study, finding suggests that the romantic breakup which follows a systematic pattern, can be traumatic. Individuals are languishing post breakup as they are unable to forget or forgive the unresolved issues related to the breakup which affects attitude towards marriage. Difficulty forgiving oneself, one s ex-partner and the experience is indicated. -
Fake News Detection in Healthcare Using Machine Learning
The internet has revolutionary power in todays society, acting as an unmatched catalyst for technical innovation, worldwide connectedness, and information dissemination. It has transformed communication and made knowledge more accessible to all, and given people, companies, and society the tools they need to prosper in the connected digital world. However, this power is responsible for navigating issues, such as the proliferation of fake news and safeguarding information integrity. As peoples health comes first, false information about it might have disastrous consequences. Even for the most knowledgeable professionals in the field, identifying false information about health can be difficult because of the variety of factors that must be considered. New advances in machine learning have enabled automatic classification of bogus news. For the detection of fake news correctly, we must train the automation in such a way that it captures the bogus correctly, and for that the data we input is of at most importance and, in fact, the most important as well. To enhance the models capacity to discern between authentic and fake news, this study investigates the extraction of structural and semantic information from text using a combination of named entity recognition and syntactic parsing. Utilizing these characteristics, we trained a variety of machine learning algorithms, assessed their effectiveness, and found that the Random Forest classifier outperformed the others in classification. 2025 Scrivener Publishing LLC. -
K-shell fluorescence yields of barium and lanthanum
K-shell fluorescence yields for barium and lanthanum have been measured adopting simple 2? geometrical configuration and employing a weak 57Co radioactive source. A scintillation spectrometer with an NaI(Tl) detector of dimensions 44.5mm diameter0mm thickness was employed for the detection and measurement of radiation. The results obtained are in good agreement with the best-fitted values of Hubbell et al. (1994) and also with the other experimental values, indicating that our simple method can be extended to determine fluorescence parameters of high Z materials. 2011 Elsevier Ltd. -
An Integrated Model for Team Dynamics for Enhanced Collaboration and Performance
The CTF model introduces a new approach to team organization, inspired by the atomic structure of carbon. This interdisciplinary model combines organizational psychology, team dynamics research, and chemistry principles. The paper evaluates current team models, such as Belbins team roles, Hackmans model of team effectiveness, and the GRPI model, emphasizing their strengths and weaknesses. CTF expands on these frameworks while addressing their limitations. It consists of a productivity core (similar to protons and neutrons) and critique networks (similar to electrons), connected by Team Cohesion Factors. Unlike previous models that focus on specific aspects, CTF provides a comprehensive structure that integrates leadership, execution, and feedback mechanisms. It balances a hierarchical structure with collaborative input, including internal and external feedback systems. Inspired by the adaptability of carbon, the model is suitable for dynamic environments. Although it shows promise in addressing the limitations of previous models, CTF needs empirical validation. This paper lays out the theoretical basis of CTF, compares it with existing frameworks, explores its potential benefits and limitations, and outlines future research directions. The Author(s), under exclusive license to Springer Nature Switzerland AG 2025. -
Responding to pandemic challenges: leadership lessons from multinational enterprises (MNEs) in India
Purpose: The business sector plays a major role in achieving comprehensive economic development goals in emerging economies. Consequently, the effects of business responses to the COVID-19 pandemic are receiving increasing research attention from an organizational management development perspective. This article aims to examine the role of leadership in charting the course in an extraordinary crisis context. Design/methodology/approach: Using institutional leadership theory, leadership contingency theory and dynamic leadership capability theory, the authors present a research framework that defines macrochallenges and organizational level responses and outcomes. The article adopts a case study approach, which includes the identification of four target companies and conducting in-depth interviews with senior management professionals within those companies at different time periods. Findings: Based on the interviews, the steps that Indian companies adopted to respond to the COVID-19 challenge are identified. Expanding the insight from the case study, the findings suggest that although feeling overwhelmed at first, organizational leaders combine prudent (i.e. timely and speedy actions for survival first) and bold (i.e. future envisioning for expansion and growth) actions enabling these firms to weather two waves of the COVID-19 pandemic in India. Originality/value: These multiple case studies are unique in exploring MNEs from different industries. This study also highlights the dynamic relationships between leadership practices, risk management strategies and performance outcomes based on a sound theoretical model and rigorous study methods. 2022, Emerald Publishing Limited. -
Managing change, growth and transformation: Case studies of organizations in an emerging economy
Purpose: In view of dynamic and widespread economic transformation in emerging economies, managing organizational change and growth in this context deserves more research attention. The purpose of this paper is to examine how three organizations in different industries manage change, growth and transformation in their organizational ecosystem. Design/methodology/approach: The authors conducted in-depth interviews with the leadership of three organizations in different economic sectors in India, a country representing an emerging economy. The authors also reviewed historical data from these organizations. Three case studies illustrating the evolution of these organizations were developed from the data collected. Findings: Lessons and implications from the three case studies suggest the following key elements of effective organizational change mechanisms in an emerging economy: visionary entrepreneurial leadership; program quality excellence; scale growth and scope expansion; network capabilities; and sustainable stakeholders engagement. At the same time, this study also shows how these organizations manage change, growth and transformation in the context of a society with strong traditions and cultural norms. Research limitations/implications: Results and conclusions may be limited by the fact that the study is based on three case studies. Additional studies from a variety of industries with large numbers of participants will be helpful in more fully understanding the ways in which change, growth and transformation can best be developed and deployed in different organizational settings. Practical implications: The proposed model of organizational change in an emerging economy may assist organizational leadership in designing and sustaining their change efforts. Social implications: This study highlights the role of visionary entrepreneurial leadership and the impact of organizational growth mechanisms on organizational value delivery capabilities and organizational reputation. Originality/value: Lessons and implications of five growth steps of outstanding organizations in an emerging economy context provide valuable insight for organizational change, growth and transformation in other emerging contexts. 2019, Emerald Publishing Limited. -
The merging odyssey of trade, investment and partnership: a linkage model of India and Korea interactions
With the rising presence of India as a global power and Korea as an advanced economy, the collaborative alliance between two nations is of growing research interest. India and Korea are vastly different in terms of demographics, cultural traditions and historical experiences. However, they are unusually compatible for their shared vision and amazingly comparable in their unique positions in the dynamic world that involves strong coordinating linkage mechanisms and constructive influences. This paper aims to examine how India and Korea come to forge strategic alliance both in business relationships and national interests. We briefly review the history of interactions between India and Korea and define a unique model of linkage roles. After discussing network theory of interactions in liberal international order, propositions explain step by step how India and Korea merge to create better future for countless people through trade, investment, and partnerships. Growth stages of global firms for domestic advantage and global competitiveness are presented as well. Managerial implications and future research issues are discussed. Copyright 2022 Inderscience Enterprises Ltd. -
Purpose-driven leadership and organizational success: a case of higher educational institutions
Purpose: This paper aims to examine the relationships between organizational purpose, leadership practices and sustainable outcomes for universities in emerging economies. We propose that a strong sense of purpose is a fundamental and defining feature in the leadership practices of these institutions, which ultimately contributes to their success. Design/methodology/approach: The authors present a research model that defines the relationships between a sense of purpose, leadership practices, student success outcomes, alumni involvement outcomes and societal reputation outcomes. Over 200 higher education administrators in India participated in the study. Findings: The institutions' sense of purpose directly relates to their leadership engagement practices and their student success outcomes. Student success outcomes are a crucial linkage between leadership engagement practices and alumni involvement outcomes to achieve their societal reputation. Practical implications: As competitiveness intensifies, educational institutions under resource constraints must differentiate their organizational practices. This paper demonstrates how their core purpose and leadership actions result in achieving effective outcomes and overall sustainable societal reputation. Originality/value: There is a significant difference between having an organizational purpose and enacting that purpose through their leadership practices. These results highlight the cascading effect from the institution's fundamental sense of purpose to their leadership practices and the positive outcomes of student success, alumni involvement and societal reputation. 2021, Emerald Publishing Limited. -
Phytochemicals of Nardostachys jatamansi as potential inhibitors of HCV E2 receptor: An in silico study
Hepatitis C virus (HCV) is the causative agent of acute and chronic hepatitis and can lead to liver cirrhosis. High variability in the HCV genome renders vaccine formulation strenuous. Modern pharmaceuticals rely heavily on plant-based compounds for drug production. This study focuses on in-silico screening of phytochemicals derived from an herbal plant, Nardostachys jatamansi, for the treatment of HCV by inhibiting its E2 receptor, which binds to the hepatocytes, enabling viral entry into the liver. Computer-aided drug design utilizes various tools such as molecular docking tools, including AutoDock Vina, Avogadro, PyMol, Discovery Studio Visualizer, LigPlot+, and online tools like SwissADME (Absorption, Delivery, Metabolism and Excretion) for analysis of pharmacokinetics and pharmacodynamics of phytochemicals. Toxicity studies were carried out using pkCSM. 25 bioactive phytochemicals of N. jatamansi were analysed. The analysis was validated by comparing the data of the phytochemicals with an established antiviral drug, ribavirin. This is a novel approach to docking studies, exploring the possibility of medicinal plants as anti-hepatic drugs. Of the 25 compounds, nardosatachysin and ?-gurjunene are the standout performers and are considered potent inhibitors of HCV E2 receptor. The two compounds are recommended for further in vivo and in vitro trials to assess their efficacy in treating HCV infection. 2024 Lalrintluanga Hnamte, et al.