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Found 6423 publications
Potential of Producing Green Hydrogen Using Solar Power Plants: The Role of PEM Technology in the Improvement of Photovoltaic Schedule Keeping in Hungary
Publication Name: Chemical Engineering Transactions
Publication Date: 2024-01-01
Volume: 114
Issue: Unknown
Page Range: 925-930
Description:
Similarly to many countries of the world, photovoltaic systems play an increasingly important role in electricity generation in Hungary, contributing greatly to the climate, environmental and sustainability goals of the energy transition. As a result of numerous factors, photovoltaic technology is used not only more and more widely but also in increasingly decisive quantities and proportions. Due to the intermittent nature of solar energy, photovoltaic generation varies both in space and over time and consequently poses a serious challenge to system management, especially due to dynamically developing capacities. The imbalances caused by uncertainty cannot be addressed by scheduling alone without the possibility of energy storage, which, with its numerous services and applications, is able to provide the flexibility necessary for the smooth operation of the system. Among the available energy storage systems, power-to-gas technology (i.e. converting electricity produced from renewable energy sources into a gaseous energy carrier) is emerging as a practical solution with high potential for the integration of variable renewable energy sources. The gas produced in this way, which can be stored and transported, can be used in many areas and sectors of energy use, such as transport, home heating and cooling and industrial processes, and can now also provide an effective solution for grid stability and scheduling. The aim of the present research is to present the potential amount of green hydrogen that can be produced by proton-exchange membrane technology (PEM) in connection with schedule-related downregulation, considering the climatic conditions and the total photovoltaic power plant capacity in Hungary. The novel, practical benefit of the research lies in the fact that it determines practically relevant characteristics in relation to the interconnections of solar power plants in Hungary and power-to-gas technology for transmission system operators, the key players of the energy market and decision-makers. This knowledge will not only help companies investing in solar power plants and power-to-gas technology from an economic point of view but can also contribute to the market-related development of hydrogen production solutions related to photovoltaic technology. Overall, P2G offers the ideal potential to convert the electricity produced by solar power plants that need to be downregulated, i.e. comprises a surplus in terms of scheduling, into green hydrogen, which is also suitable for long-term seasonal storage.
Open Access: Yes
DOI: 10.3303/CET24114155
Finite element simulation and development of a radio frequency inductor
Publication Name: Pollack Periodica
Publication Date: 2009-08-01
Volume: 4
Issue: 2
Page Range: 25-36
Description:
The design of inductors is not an easy and cheap task considering the dimensions, the nominal value of inductance, the quality factor and the impedance of the component. Before the beginning of manufacturing a new type of inductors, a lot of trial components have to produce, have to measure and have to try out. Finite element modeling is a well-tried process to examine engineering products before manufacturing them. To reduce the cost and the time of the design process, in the paper a finite element model has been built up to simulate inductors. In the paper the model is presented, which is able to simulate the important attributes of the component, for example the inductance, the impedance and the quality factor. The comparison of the experimental and the simulated attributes of the inductor will also be shown. By using the built up model the development possibilities of the inductor have been examined through the modification of the winding.
Open Access: Yes
Mixed comparison of intervention with eccentric, isometric, and heavy slow resistance for Victorian Institute of Sport Assessment Patella Questionnaire in adults with patellar tendinopathy: A systematic review and network meta-analysis
Publication Name: Heliyon
Publication Date: 2024-11-15
Volume: 10
Issue: 21
Page Range: Unknown
Description:
Background: PT (Patellar Tendinopathy) is a degenerative disorder of the tendons induced via extended overstretching or overuse of the tendons instead than usual inflammation. In the past, humans have centered on a number of strategies of treating PT such as ultrasound and surgical treatment. However, they did no longer genuinely consider the effectiveness of eccentric, isometric, or HSR (Heavy Slow Resistance Training) education for PT; They did now not really outline the stage of PT to beautify the uniformity of the find out about participants; They did no longer immediately examine the affects of isometric, eccentric, and HSR training. This systematic assessment chosen eccentric, isometric, and heavy gradual resistance coaching for the remedy of patellar tendinopathy and their respective prognostic effects will supply valuable, top notch evidence-based insights as properly as vital facts and advice for future scientific administration of patellar tendinopathy. Methods: A thorough and comprehensive search was conducted across the Web of Science, PubMed, and Scopus databases, encompassing a wide range of relevant journals and sources, in order to perform a rigorous systematic review and network meta-analysis, ensuring the inclusion of all pertinent and high-quality studies. The selected studies satisfied predetermined eligibility requirements, which included: (1) PT patients included in the studies; (2) use of eccentric, isometric, and heavy slow resistance training as interventions; and (3) evaluation of VISA-P (Victorian Institute of Sport Assessment Patella Questionnaire) outcome measures. The effect magnitude was measured using the standard mean difference. The risk of bias inherent in each of the studies that were meticulously selected and included in the comprehensive analysis was rigorously evaluated and assessed using the well-established Cochrane Collaboration Risk of Bias Assessment Tool, ensuring the robustness and reliability of the research findings. Results: Three scientific databases yielded a total of 1460 studies, of which 7 were included in the final analysis. The findings indicated that eccentric training (0.01 in Rank 1 and 0.06 in Rank 8) is the worst method for increasing VISA-P level in patients with patellar tendinopathy, while moderate resistance slow training (0.25) and Rank 1 and Rank 8 are the best options. Conclusions: While heavy slow resistance is more suited for attaining long-term improvements in knee function, progressive tendon-loading exercises combined with isometric training or moderate slow resistance training are more beneficial than eccentric training alone. Eccentric training gives a greater range of exercise venues and doesn't require any additional training equipment. The inability to directly compare the effects of heavy slow, eccentric, and isometric resistance training constitutes a significant drawback of this review. This limitation stems from the scarcity of research that compares the outcomes of these various therapeutic approaches. To address this constraint, future research endeavors should strive to conduct comparative studies of these strategies. By doing so, they can aim to bridge this evaluation gap and facilitate a more effective and comprehensive assessment of their respective efficacies.
Open Access: Yes
Performance evaluation of DNS servers to build a benchmarking system of DNS64 implementations
Publication Name: Telecommunication Systems
Publication Date: 2021-08-01
Volume: 77
Issue: 4
Page Range: 643-653
Description:
DNS64 is an important IPv6 transition technology that facilitates the communication of an IPv6 only client with an IPv4 only server, which becomes a more and more common scenario. Several different DNS64 implementations exist, and their performance is a relevant decision factor for network operators. RFC 8219 has defined a benchmarking methodology for DNS64 servers, which requires the operation of an authoritative DNS server at 220% of the query rate used for DNS64 benchmarking. In this paper, we aim to build an authoritative DNS server that operates at 2.2 million qps (queries per second) rate, thus it facilitates DNS64 benchmarking up to 1,000,000 qps rate. To that end, we compare the performance of BIND, YADIFA, NSD, Knot DNS and FakeDNS (a special purpose software) to find the best suiting one of them. We fully disclose the details of our measurements including the configuration of the DNS implementations, the usage of our improved software tester called dns64perf ++, and the details of the hardware and software measurement environment in the NICT StarBED, Japan. We perform a series of measurements to examine, how the performance of the tested solutions scale up with the number of the active CPU cores from 1 to 32. Besides their performance, we also measure their memory consumption and zone load time. We present and discuss all the results. In addition to successfully building an authoritative DNS server with the required performance, we also make recommendations, which solutions suit to different special needs.
Open Access: Yes
Evaluation of training to improve auditory memory Capabilities on a mobile device based on a serious game application
Publication Name: 142nd Audio Engineering Society International Convention 2017 AES 2017
Publication Date: 2017-01-01
Volume: Unknown
Issue: Unknown
Page Range: Unknown
Description:
Capabilities of the auditory memory system were tested in a serious game application developed for the Android mobile platform. Participants played the well-known game of finding pairs by flipping and remembering objects on cards arranged in a matrix structure. Visual objects were replaced by iconic auditory events (auditory icons, earcons). Total time and different error rates were recorded and the effect of training was also evaluated. Results indicate that training contributes to a better performance and human voice samples are the easiest to remember.
Open Access: Yes
DOI: DOI not available
Achieving Sustainable Supply Chains: Applying Group Concept Mapping to Prioritize and Implement Sustainable Management Practices
Publication Name: Logistics
Publication Date: 2025-09-01
Volume: 9
Issue: 3
Page Range: Unknown
Description:
Background: Sustainability in supply chain management (SCM) practices is becoming increasingly important as environmental responsibility and social concerns, as well as enterprises’ competitiveness in terms of innovation, risk, and economic performance, become increasingly urgent. This paper aims to identify and prioritize concepts for implementing sustainable supply chains, drawing on sustainable supply chain management (SSCM) and green supply chain management (GSCM) techniques. Corporate supply chain managers across various industries, markets, and supply chain segments brainstormed management practices to enhance the sustainability of their supply chains. Four industry sectors were surveyed across five different value chain segments. Methods: A group concept mapping (GCM) approach incorporating multi-dimensional scaling (MDS) and hierarchical cluster analysis (HCA) was used. A hierarchy of practices is proposed, and hypotheses are developed about achievability and impact. Results: A decision-making matrix prioritizes eight solution concepts based on two axes: impact (I) and ease of implementation (EoI). Conclusions: Eight concepts are prioritized based on the optimal effectiveness of implementing the solutions. Pattern matching reveals differences between emerging and developed markets, as well as supply chain segments, that decision-makers should be aware of. By analyzing supply chains from a multi-part perspective, this research goes beyond empirical studies based on a single industry, geographic region, or example case.
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
Multilayer perceptrons constructed of fuzzy flip-flops
Publication Name: Isciii 09 4th International Symposium on Computational Intelligence and Intelligent Informatics Proceedings
Publication Date: 2009-12-28
Volume: Unknown
Issue: Unknown
Page Range: 9-14
Description:
The target of this paper is to propose a hybrid combination of the three main branches of Computational Intelligence, namely Fuzzy Systems, Neural Networks and Evolutionary Computing. The function approximation properties of fuzzy J-K and D flip-flops based feedforward neural network optimized and trained with a novel evolutionary algorithm based technique; the Bacterial Memetic Algorithm with Modified Operator Execution Order (BMAM) is studied. © 2009 IEEE.
Open Access: Yes
Inter-cognitive Communication Model Using Additive Manufacturing Technology
Publication Name: 9th IEEE International Conference on Cognitive Infocommunications Coginfocom 2018 Proceedings
Publication Date: 2018-07-02
Volume: Unknown
Issue: Unknown
Page Range: 217-222
Description:
3D technology has made significant progress over the last decade. In this paper, we focus especially on physical 3D visualization using 4D-printed smart materials, which opens up new possibilities through the continuous development of the additive manufacturing technology (AMT). The aim of our research is to establish an AMT-based, two-way and real-time inter-cognitive communication model, which can be an effective tool in different situations, for example for managers in physical visualization of business information and in responding to displayed information.
Open Access: Yes
