1,720,968 research outputs found
A Hydrogen-based Storage System to Peak Shaving Domestic Prosumers Energy Demand: A Case Study in Italy
No full textTo support the electricity grid's capacity in meeting the rising domestic energy demand, the growing presence of building-integrated photovoltaics, and enhancing grid flexibility, harnessing hydrogen generated from surplus photovoltaic power at individual homes presents a promising solution. To smooth the households' demand curve and optimize the power balance, this study employs a simulation-driven methodology to assess the viability of combining hydrogen-based storage systems with building-integrated photovoltaics. Firstly, surplus periods of photovoltaic output of a building in Brescia, Italy, are identified to simulate the hydrogen yield from an electrolyzer-fuel cell system: the electrolyzer utilizes excess generation from installed photovoltaics and distributed network (DN) surplus, while the fuel cell converts hydrogen to electricity during hours when the load is higher than a limit value. The limit value for DN-supplied energy is obtained by optimizing the scenario so that the total energy provided by the DN without using hydrogen is the same as when hydrogen is used. This simulation is conducted for annual and seasonal (summer) scenarios, considering electricity consumption from traditional electrical appliances, heat pumps, summer cooling, and electric water boilers. Finally, the technical challenges encountered in obtaining a smoother load demand and possible solutions are discussed, while the economic analysis will be addressed in future works
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
Using Automatic Low-Voltage Regulators to Increase Distribution Networks' Hosting Capacity: A Real case Study in Milan, Italy
No full textThe energy transition is leading to growing electrification of consumption and production from non-programmable renewable sources within distribution networks. In this scenario, new challenges emerge in the operation of distribution networks, which distribution system operators must efficiently manage. The paper investigates a real case study in Milan's distribution network where frequent overvoltage and under-voltage problems have led to the deployment of an automatic low-voltage regulator to guarantee a reliable service of a long rural low-voltage feeder with photovoltaic and storage systems connected to it. Firstly, the paper presents current voltage issues in distribution networks, the working principle of the installed low-voltage regulator and a brief description of the feeder under study. Secondly, after the description of the optimal sizing and location through the feeder, the field data collected by the low-voltage regulator over a couple of months is punctually and statistically analyzed to demonstrate the valuable impact on voltage stability. In the end, the paper highlights the benefits gained by Unareti, Milan's distribution system operator, comparing the presented innovative voltage control solution with the traditional approach of network reinforcement from both technical and economic points of view
Hair cross-sectioning in uncombable hair syndrome: An easy tool for complex diagnosis
No full textUncombable hair syndrome (pili trianguli et canaliculi) is a rare genetic disease characterized by unruly hair, whose diagnosis could be made through an easy test such as hair cross-sectioning typically showing triangular and oval shapes
Management strategy of EV fleets charging stations for demand response capabilities: a case study
No full textUnder the pressure of the ecological transition, electricity is more and more crucial for the sustainable economic and social development of cities. Energy flows are increasing in city distribution networks, and Distribution Systems Operators (DSOs) are constantly looking for new solutions to meet customer demands. Local flexibility services based on Distributed Energy Resources (DERs), including Electric Vehicles (EVs) have emerged as a possible solution in recent years. The paper presents a study focused on the EVs charging hub of Unareti SpA, the DSO of the city of Milan. The aim of this study was to determine the hub's possible role and contribution to the Demand Response (DR) services of the elctricity network. The impact of the charging load, the potential services and a possible energy optimization are evaluated and discussed in detail, based on real data measured during two summer months
BENEFITS FOR THE DISTRIBUTION NETWORK FROM THE INSTALLATION OF SYNCHRONIZED EDGE DEVICES
No full textVariations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Optimal end-users electrification management: a BESS-based DSO approach to support distribution grid planning and delay network reinforcement
No full textThe paper investigates the advantages of using Battery Energy Storage Systems (BESS) in the distribution networks at the planning stage to manage grid congestions caused by the end-users' electrification. Firstly, the resulting demand for a full-electric house scenario and its impact on the electricity grid is evaluated by considering several real-life domestic customer load profiles. Secondly, the paper investigates the feasibility of installing BESSs to meet the increased load avoiding reinforcement of existing grid infrastructures. For doing so, the additional electricity demand might be managed by correctly sizing and installing BESSs, which can be recharged when the electricity demand is lower while discharged in a time of higher need. Finally, an economic assessment identifies the breakeven point between constructing new grid infrastructures and adopting BESSs. The technical and economic evaluations are based on real data from the Distribution System Operator (DSO) of Milano and Brescia, Unareti S.p.A
- …
