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Authors - 9813
Publications - 6374
Thermal-hydraulic performance of heat exchanger mini- and micro-channels with single-phase flows. A comprehensive review and a comparative study
Publication Name: Renewable and Sustainable Energy Reviews
Publication Date: 2026-04-01
Volume: 230
Issue: Unknown
Page Range: Unknown
Description:
The efficient use of energy is a prerequisite for the sustainable development of modern society. It requires increasing heat recuperation in various energy-reliant systems, which is possible with heat transfer devices of intensive action, operating in conditions of limited space for installation and material availability for their production. This is achieved by heat exchangers with mini- and micro-channels, regarded as the next generation of heat transfer equipment. A survey of publications on heat transfer and pressure losses in mini- and microchannels is presented, with focus on their thermal-hydraulic performance. It includes straight channels of various cross-sectional forms, channels with enhanced heat transfer for electronic cooling, additively manufactured microchannels, crisscross flow channels of microturbine recuperators, and plate heat exchangers. A novel Micro Heat Factor for the comparison of mini- and microchannels thermal-hydraulic performance is derived. For the detailed estimation of channel performance in specified process conditions, accounting for the differences in hydraulic diameters, the equation for optimal fluid velocity is proposed. The comparison of thermal-hydraulic performance for different types of mini- and micro channels is performed, and the possibilities of their use in heat exchangers at specific applications are discussed, followed by directions of future studies.
Open Access: Yes
The development of the primary care general practitioner cluster model: experiences from Hungary
Publication Name: Frontiers in Health Services
Publication Date: 2026-03-30
Volume: 6
Issue: Unknown
Page Range: Unknown
Description:
Background – In 2021, Hungary introduced general practitioner (GP) clusters to improve access to local healthcare and strengthen cooperation among primary care providers. However, there is limited evidence on how these clusters operate. Objective – The aim of this research is to provide a comprehensive description of how GP practices and clusters function, and to describe variables associated with a GP's participation in a cluster. Methods – We analysed national data on general practices and GP clusters in Hungary for the period 2021–2024. This data was obtained from the National Hospital Directorate and supplemented with information from publicly available sources. After harmonising and integrating the data, we used descriptive statistical methods to characterise the operation of practices and clusters. We also used multivariate regression models to examine factors associated with GPs' decisions to join a cluster. Results – Between 2021 and 2024, the number of GP clusters increased from 365 to 422. Nearly half of all practices had joined by 2024. On average, clusters included seven practices, with one-third collaborating with dentists. Significant regional disparities were observed in cluster participation, while the adoption of digital health technologies and point-of-care tests remained limited. While GP clusters have expanded nationwide, participation appears higher in better-resourced districts. Conclusion – As in many other developed countries, GP clusters have become increasingly widespread in Hungary. One-third of these clusters involve collaboration between GPs and dentists. While these clusters provide a variety of professional services, challenges persist due to vacant practices and regional disparities. To ensure sustainability, future efforts should strengthen digital health integration and promote the widespread adoption of innovative services provided by GP clusters.
Open Access: Yes
Synergistic dynamics unveiled: Interplay between rare earth prices, clean energy innovations, and tech companies' market resilience amidst the Covid-19 pandemic and Russia-Ukraine conflict
Publication Name: Resources Policy
Publication Date: 2024-02-01
Volume: 89
Issue: Unknown
Page Range: Unknown
Description:
Rare earth elements play a crucial role in supporting low-carbon energy generation technologies, such as electric motors in electric vehicles and the production of wind turbines. Additionally, these elements are utilized in a wide range of products manufactured by tech companies, including smartphones, aerospace components, and microelectronics. This paper aims to investigate the interplay between rare earth element prices (REMX), clean energy innovations (NEX), and the market of tech companies (PSE) from February 2018 to February 2023. To analyze the interdependencies between these markets, the study employs the cross-quantilogram (CQ) and wavelet local multiple correlation (WLMC) techniques. The findings of the investigation reveal a positive correlation between rare earth elements and the clean energy market, but only when both markets are in their respective extreme quantiles (10th and 90th). However, when the clean energy market is in a lower quantile and REMX is in a higher one for an extended period, there is either no significant interdependence or a negative relationship. Furthermore, the study identifies a positive co-movement between PSE and REMX in the short, intermediate, and extremely long-term. However, this relationship turns negative in the long run. The values of the coefficients fluctuate over time, particularly at larger scale periods of 8–16 when using the WLMC procedure. These findings have notable implications for stakeholders, including investors, managers, and policymakers, who are linked to the field of mineral resources and industries reliant on rare earth element-based technologies.
Open Access: Yes
Low-carbon agricultural practices enhance climate resilience and food security in India
Publication Name: Discover Sustainability
Publication Date: 2026-12-01
Volume: 7
Issue: 1
Page Range: Unknown
Description:
Low-carbon agricultural (LCA) practices, including nutrient, water, and soil management, present viable strategies for mitigating greenhouse gas (GHG) emissions while enhancing agricultural productivity. However, their long-term impacts on food security and emission reduction at the national scale require further investigation. This study employs scenario-based analysis to assess the role of LCA in reducing carbon dioxide, nitrous oxide, and methane emissions while evaluating its effects on food production, accessibility, and availability in India. By conceptualizing LCA as a baseline scenario, the study examines the influence of technology adoption, government policies, and sustainable agricultural practices in enhancing food security and mitigating climate change. A systematic literature review, following the PRISMA protocol, was conducted using keyword co-occurrence analysis from major global databases, including Scopus, ScienceDirect, Web of Science, and government and organizational sources. The findings indicate that efficient resource and nutrient management significantly strengthen food security while reducing annual GHG emissions, supporting India’s progress toward food self-sufficiency and climate resilience. These insights provide a foundation for strengthening national and global food policies and climate mitigation strategies, aligning with multiple Sustainable Development Goals (SDGs), including SDG 2 (Zero Hunger), SDG 6 (Clean Water and Sanitation), SDG 11 (Sustainable Cities and Communities), SDG 12 (Responsible Consumption and Production), SDG 13 (Climate Action), SDG 15 (Life on Land), and SDG 17 (Partnerships for the Goals). This study underscores the critical role of LCA in integrating food security with environmental sustainability, offering a policy-driven approach to climate adaptation and sustainable agricultural development in India.
Open Access: Yes
The Role of Media in Sponsorship Decision Making During Covid-19: A Malaysian Perspective
Publication Name: Jurnal Komunikasi Malaysian Journal of Communication
Publication Date: 2022-01-01
Volume: 38
Issue: 2
Page Range: 182-197
Description:
COVID-19 has impacted not only human lives, but also business organisations. The repercussions of the pandemic on global businesses include sustaining the value of a firm that could benefit stakeholders, such as the challenge for sponsored properties to attain sponsorship through a period of financial struggles and the capacity of a sponsor to provide it. It is imperative for business-to-business (B2B) communities to evaluate criteria and risks of sponsorship to instil public trust and consequently result in value creation for firms. At the same time, the role of the media is pivotal to create visibility of this partnership and achieve set sponsorship aims. With that said, the objective of this study is to explore the role of sponsorship decision making by Malaysian organisations during the pandemic and how the media have strengthened relationship marketing between businesses and their stakeholders; by examining the determinant factors of using media as an activation in sponsorship and the criteria of using media in sponsorship. The qualitative study conducted interviews with 13 corporate communication and marketing managers in Malaysia that are involved directly with sponsorship activation. The findings highlight the sponsorship ecosystem through the Malaysian media and B2B perspectives that would guide practitioners in making strategic decisions on B2B sponsorship matters, particularly on the relational approaches and media engagement should be seen as part of good business conduct. Future recommendation of this research is to seek the perceptions of consumers on the congruence of relationship marketing through sponsor-sponsored properties collaboration in Malaysian media.
Open Access: Yes
Biharmonic Scattered Data Interpolation Based on the Method of Fundamental Solutions
Publication Name: Lecture Notes in Computer Science Including Subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics
Publication Date: 2023-01-01
Volume: 14076 LNCS
Issue: Unknown
Page Range: 485-499
Description:
The two-dimensional scattered data interpolation problem is investigated. In contrast to the traditional Method of Radial Basis Functions, the interpolation problem is converted to a higher order (biharmonic or modified bi-Helmholtz) partial differential equation supplied with usual boundary conditions as well as pointwise interpolation conditions. To solve this fourth-order problem, the Method of Fundamental Solutions is used. The source points, which are needed in the method, are located partly in the exterior of the domain of the corresponding partial differential equation and partly in the interpolation points. This results in a linear system with possibly large and fully populated matrix. To make the computations more efficient, a localization technique is applied, which splits the original problem into a sequence of local problems. The system of local equations is solved in an iterative way, which mimics the classical overlapping Schwarz method. Thus, the problem of large and ill-conditioned matrices is completely avoided. The method is illustrated via a numerical example.
Open Access: Yes
Induced and field mechanical effects on the hatchability of broiler breeder hatching eggs
Publication Name: European Poultry Science
Publication Date: 2024-01-01
Volume: 88
Issue: Unknown
Page Range: Unknown
Description:
Egg transport and rough egg handling can have numerous negative effects on hatchability. The authors monitored mechanical effects under field conditions by acceleration sensors and then simulated the same scale effects using a modelling machine to verify the effects on hatchability. To measure and record mechanical effects-instantaneous acceleration (m/s2), three-dimensional HOBO® Pendant® G Data Logger were used. The RSS, RSM values calculated from the data from the accelerometer can serve as a point of reference for practitioners to see the mechanical effect level which results in significant negative impact on the hatchability results. It was also revealed that the measurement of the recorded values in the different directions and the minimum and maximum values are important too. Using the HOBO® Pendant® G Data Logger and detailed logging (the exact location of the logger at the time of the technological steps at a given time) can reveal the location of the maximum impact. By analysing RMS x, y, z, the type of impact can be determined. By combining these two pieces of two information, the technological failure can be clearly revealed and corrected. The measurement process described by the authors provides practical advice for hatching egg producers. Moreover, attention is drawn to the short-term damage effect on hatchability, since the 5-minute treatment at 20 Hz, prior incubation significantly reduced the hatchability (P < 0.05), which was achieved at the level of 10.02 RSS m/s2 and 12.3 m/s2 maximum value in the direction of x-axis. It is important for hatching egg producers to be aware that the damage to the mechanical effect is not only visible (broken, cracked eggshell), but can also negatively affect hatchability and thus the profitability of the sector. Furthermore, the typical “spider web” crack on the eggshell clearly refers to the mechanical impact caused by vibration.
Open Access: Yes
DOI: 10.1399/eps.2024.397
Sustainable Battery Recycling in the Age of Electromobility
Publication Name: Engineering Perspective
Publication Date: 2025-12-28
Volume: 5
Issue: Special Issue
Page Range: 18-27
Description:
The rapid spread of electric vehicles offers numerous opportunities to reduce greenhouse gas emissions, but also creates new and complex challenges for the automotive industry, particularly in terms of battery life cycle management. Electric cars are currently powered mostly by lithium-ion batteries, which rely on critical raw materials such as lithium, cobalt, nickel, and manganese. These resources are limited, and their extraction often involves energy-intensive and polluting mining processes that can have a serious impact on soil, water resources, and local communities. As demand for electric vehicles grows worldwide, so does the pressure on the sustainability of raw material supplies. The efficient recycling of batteries plays a key role in solving these problems. Recycling not only reduces the demand for primary raw materials, but also reduces waste and contributes to lowering the environmental footprint of electromobility. The study provides a comprehensive overview of the methods currently used to recycle electric vehicle batteries. The most common technologies include pyrometallurgical processes, which recover metals through high-temperature smelting, hydrometallurgical methods, which use chemical solutions to extract valuable materials, and direct recycling, which aims to reuse individual battery components directly. Each solution has its own advantages and limitations in terms of efficiency, cost, environmental safety, and industrial scalability. The study also pays special attention to new, innovative approaches. Automated dismantling technologies, for example, can make dismantling processes safer and faster, while reducing risks to human health. Finally, the regulatory environment and industry practices also play a key role in ensuring the long-term sustainability of battery recycling and the supply chain. The aim of the study is to contribute to the development of a circular automotive industry and to support the spread of sustainable battery management from both a technological and industrial perspective.
Open Access: Yes
Overstrength assessment of innovative metallic I-shaped damper
Publication Name: Steel and Composite Structures
Publication Date: 2026-03-25
Volume: 58
Issue: 6
Page Range: 719-737
Description:
This study investigates the overstrength factor (Ω of an innovative-shaped metallic shear damper designed for enhancing seismic resilience in concentrically braced frames (CBFs . To evaluate the influence of geometric variables-including web/flange thickness, damper height, and slenderness ratios (λw , λf , λℎ -a parametric study was conducted using 100 finite element models validated against experimental tests. The results demonstrate that all considered-shaped dampers exhibit Ω values exceeding 1.5, surpassing the A SC recommendations for shear links. t was found that while increasing web plate thickness significantly improves ultimate strength (up to 2.35 times, it tends to reduce Ω . Conversely, increasing flange thickness enhances both ultimate strength and Ω, challenging current guidelines that often neglect flange contributions. Specifically, within the flange slenderness range of 10 ≤ λf ≤ 15, the reduction rate of structural parameters is most significant. To ensure balanced seismic performance and economic efficiency, this study proposes designing dampers with a web slenderness ratio of λw ≤ 33 and a strength ratio of Ψ > 5.0. These findings offer uuantitative insights for refining design guidelines to accurately reflect the damper’s overstrength capacity.
Open Access: Yes
