1,721,088 research outputs found
On Power Electronic Converter's Architecture and Control for Overtopping Breakwater for Wave Energy Conversion
No full textThis paper discusses the power electronic converter's architecture and control for overtopping breakwater for wave energy conversion (OBREC) systems for the first time for this kind of technology. After a recall of the main OBREC's components, their dynamic models and control strategies are briefly summarized. Then, an innovative maximum power point tracking strategy is proposed, and a proactive overview of different existing power electronic architectures to connect the OBREC system to the harbour's electrical distribution systems is conducted. The whole converter's control design process is preliminarily tested utilizing the processor-in-the-loop tool implemented in the Matlab environment. Finally, two numerical case studies on a realistic scenario are discussed and commented
Caratterizzazione biologica, sierologica e molecolare di un nuovo Nepovirus riscontrato in Campania su Aeonium sp.
No full textDefinition of the solid state circuit breaker limits working with active clamp driver
No full textThe Solid State Circuit Breaker (SSCB) is conveniently used to substitute classical circuit breaker for the applications where the circuit breaker works with high mechanical stress (i.e. high vibrations, shock etc) and the dimension and weight must be reduced. Among the SSCB family, the snubberless SSCB have been recently introduced for particular application that differs from the classical SSCB because waste the load energy in the SSCB itself during the turn-off time. This is possible by using particular IGBT/MOSFET drivers with active clamp circuits. In this paper the authors find the limits of this class of SSCB circuits and define the key elements that act on the them
V2G Potential in Italy: Status, Challenges, and Future Directions from a Grid and Consumer Perspective
No full textOne of the main contributors to global energy consumption and greenhouse gas emissions is the transportation industry. Starting the change to electric vehicles (EVs), Italy is aiming at complete energy sustainability. Vehicle-to-grid (V2G) technology, which lets EVs provide energy back to the grid, therefore enhancing grid stability and efficiency, marks a significant development in this shift. This study presents the infrastructure, implementation issues, and current status of V2G in Italy. It highlights smart meter deployment, pilot projects, and the expansion of charging infrastructure while addressing important technical and regulatory barriers like the limited availability of bidirectional chargers and uncertain standards and tariffs. Recommendations are provided to original equipment manufacturers (OEMs), grid operators, and legislators, emphasizing investment, standardization, and consumer education to mitigate these difficulties. The study indicates that while V2G offers significant prospects for energy resilience and decarbonization, its successful implementation relies on coordinated efforts across multiple sectors
Soft-switching modulation for boost full bridge converter with active clamp circuit
No full textThis paper presents an improved soft-switching modulation for boost full bridge converter with active clamp circuit. The active clamp is used to achieve the zero voltage switching (ZVS) operating conditions for the clamp itself and the full bridge. Thanks to the ZVS property, the converter can be used with high switching frequency, improving the power density. Moreover the boost circuit allow to reduce the transformer voltage ratio and to work with wide variation of input and load. The active clamp driving logic has been modelled with Finite State Machine (FSM) and can be easily made with classical digital circuit logic. The mathematical analysis was verified with PLECS simulations
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Modelling and Experimental Validation of Interharmonic Emission of an Inverter-Driven Heat-pump
No full textInterharmonic modelling and experimental verification of an inverter-driven heat-pump (HP) under different power levels is considered in this paper. Results of a research activity, conducted first in New Zealand at the University of Canterbury (UC) and then in Italy at the University of Campania (UCLV), are reported. The aim is to examine the effect of interharmonics on the low voltage network produced by HPs. The time-domain model developed in another paper from some of the authors for harmonic studies and experimentally validated by measurements made in the field is here extended to model also interharmonics. Very accurate results in terms of interharmonic injection are obtained, which will allow the use of the proposed model in more comprehensive harmonic and interharmonic penetration studies in the time and frequency domains
Heterologous expression of carnation Italian ringspot virus p36 protein enhances necrotic cell death in response to acetic acid in Saccharomyces cerevisiae
No full textA universal feature of the replication of positive-strand RNA viruses is the association with intracellular membranes. Carnation Italian ringspot virus (CIRV) replication in plants occurs in vesicles derived from the mitochondrial outer membrane. The product encoded by CIRV ORF1, p36, is required for targeting the virus replication complex to the outer mitochondrial membrane both in plant and yeast cells. Here the yeast Saccharomyces cerevisiae was used as a model host to study the effect of CIRV p36 on cell survival and death. It was shown that p36 does not promote cell death, but decreases cell growth rate. In addition, p36 changed the nature of acetic acid-induced cell death in yeast by increasing the number of cells dying by necrosis with concomitant decrease of the number of cells dying by programmed cell death, as judged by measurements of phosphatidylserine externalization. The tight association of p36 to membranes was not affected by acetic acid treatment, thus confirming the peculiar and independent interaction of CIRV p36 with mitochondria in yeast. This work proved yeast as an invaluable model organism to study both the mitochondrial determinants of the type of cell death in response to stress and the molecular pathogenesis of (+)RNA viruses
Linear Programming-Based Power Management for a Multi-Feeder Ultra-Fast DC Charging Station
No full textThe growing number of electric vehicles (EVs) affects the national electricity system in terms of power demand and load variation. Turning our attention to Italy, the number of vehicles on the road is 39 million; this represents a major challenge, as they will need to be recharged constantly when the transition to electric technology is complete. If we consider that the average power is 55 GW and the installed system can produce 120 GW of peak power, we can calculate that with only 5% of vehicles in recharging mode, the power demand increases to 126 GW, which is approximately 140% of installed power. The integration of renewable energy sources will help the grid, but this solution is less useful for handling large load variations that negatively affect the grid. In addition, some vehicles committed to public utility must have a reduced stop time and can be considered to have higher priority. The introduction of priorities implies that the power absorption limit cannot be easily introduced by limiting the number of charging vehicles, but rather by computing the power flow that respects constraints and integrates renewable and local storage power contributions. The problem formulated in this manner does not have a unique solution; in this study, the linear programming method is used to optimise renewable resources, local storage, and EVs to mitigate their effects on the grid. Simulations are performed to verify the proposed method
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