Search results for "33"
showing 10 items of 1917 documents
Green Data Centres integration in smart grids: New frontiers for ancillary service provision
2017
Abstract The paper presents a study, conceived within the GEYSER FP7 co-funded European research project, on the ancillary services that Green Data Centres (GDCs) can provide, focusing, in particular, on spinning reserve. More in detail, the main contribution of the paper is to show how GDCs can be involved in the secondary frequency regulation process of a smart distribution grid, for contrasting the disturbing effects of unexpected variation of the energy production. With this aim, a real data centre, owned by Engineering S.p.A., is simulated as connected to the Medium Voltage IEEE 14-bus test grid where some RES-based generators are supposed to exist. Simulations are carried out in order…
A distributed minimum losses optimal power flow for islanded microgrids
2017
Abstract In this work, the minimum losses optimal power dispatch problem for islanded microgrids with distributed energy resources (DER) is solved by means of a distributed heuristic approach. Optimal power management is performed almost in real time, with a predefined schedule, i.e. every 5 min, and the solution is applied to generators when the current operating solution violates voltage or current constraints or when the current configuration produces too large power losses. The operating point of both inverter-interfaced generation units as well as rotating production systems can be modified simply using local information. The latter are voltage measurements and power injections or load…
Priuilegi, concessio, y merced de la insaculacio que ha concedit la Magestat del Rey ... a la ... ciutat de Valencia, perals oficis majors del gouern…
1634
Sig. [ ]1, A8. - El text en castellà. - Inclou una Carta reial del 18 de Novembre de 1633: A los magnificos, amados, y fieles nuestros, los Iurados, Racional, y Sindico de nuestra ciudad de Valencia Escut xil. de València a la port. - Capitals grav. Port. orlada. - Reclams
Economic analysis of different supporting policies for the production of electrical energy by solar photovoltaics in western European Union countries
2010
Abstract Within various renewable energy technologies, photovoltaics (PV) today attracts considerable attention due to its potential to contribute a major share of renewable energy in the future. However, PV market development is, undoubtedly, dependent on the political support of any given country. In this paper, after a brief analysis of national support policies in PV technology in western European Union (EU) countries, the authors perform an economic analysis of the main support mechanisms as implemented in the same countries, based on the calculation of the cash flow, the Net Present Value (NPV) and the Internal Rate of Return (IRR) indices. The analysis shows that in some situations s…
Functional and bioactive properties of peptides derived from marine side streams
2021
In fish processing, a great amount of side streams, including skin, bones, heads and viscera, is wasted or downgraded as feed on a daily basis. These side streams are rich sources of bioactive nitrogenous compounds and protein, which can be converted into peptides through enzymatic hydrolysis as well as bacterial fermentation. Peptides are short or long chains of amino acids differing in structure and molecular weight. They can be considered as biologically active as they can contribute to physiological functions in organisms with applications in the food and pharmaceutical industries. In the food industry, such bioactive peptides can be used as preservatives or antioxidants to prevent food…
Use of Spectroscopic Techniques to Monitor Changes in Food Quality during Application of Natural Preservatives: A Review
2020
Publisher's version (útgefin grein)
Comparison of the environmental assessment of an identical office building with national methods
2019
The IEA EBC Annex 72 focuses on the assessment of the primary energy demand, greenhouse gas emissions and environmental impacts of buildings during production, construction, use (including repair and replacement) and end of life (dismantling), i.e. during the entire life cycle of buildings. In one of its activities, reference buildings (size, materialisation, operational energy demand, etc.) were defined on which the existing national assessment methods are applied using national (if available) databases and (national/regional) approaches. The ?be2226? office building in Lustenau, Austria was selected as one of the reference buildings. TU Graz established a BIM model and quantified the amou…
Frequency dynamics of power systems with temporally distributed disturbances
2021
Abstract The frequency dynamics and stability of power systems is essentially affected by nature and characteristics of the disturbances occurring in the system. Conventionally, frequency transients are examined assuming a single disturbance applied at a given time. However, actual incidents in the power systems can be generally composed of a temporal sequence of events, and thus characterized by multiple power imbalances of different magnitudes and time offsets. The consideration of the effects of the temporal distribution of power imbalances is important for two main reasons: the impact on the frequency dynamics of the system in terms of frequency metrics such as minimum instantaneous fre…
Parents' math-gender stereotypes, children's self-perception of ability, and children's appraisal of parents' evaluations in 6-year-olds
2015
Abstract This study investigated for the first time the relations between parents' math–gender stereotypes, parents' evaluations of children's math ability, children's math ability self-perception, and children's appraisal of parents' evaluations, addressing 253 Italian children as young as 6 years of age, their mothers, fathers, and teachers. Novel results revealed the specific role of mothers' math–gender stereotypes in relation to daughters, but not sons: Mothers' math–gender stereotypes predicted girls' math self-perception which, in turn, predicted girls' appraisal of both mothers' and fathers' evaluations of their ability. Importantly, children's appraisal of parents' evaluations was …
El proceso de formación de la estrategia y los tipos de trabajo desde una perspectiva microorganizativa.
2008
Partiendo de la idea de que el proceso integrador de formación de la estrategia es el más eficiente en entornos turbulentos, planteamos también que este proceso es el más eficiente en la gestión del trabajo, y en especial del trabajo complejo. El objetivo general planteado es estudiar porqué un enfoque integrador de la estrategia puede ser más eficiente en la gestión del trabajo y en especial en el trabajo complejo; y cómo, a través de qué variables, el proceso integrador de formación de la estrategia genera resultados organizativos superiores en la gestión del trabajo. Seguimos una metodología cualitativa con estudio múltiple de casos. El diseño del estudio de casos siguió la estructura de…