1,721,225 research outputs found
An Effective Energy Management System to Assess the Convenience of Participating in Electricity Markets
No full textThis paper presents an effective Energy Management System (EMS) that allows Microgrids and polynegative plants to estimate the possible incomes deriving from the participation to the Ancillary Service Market (ASM) and Day Ahead Market (DAM). Since the electricity market requests strongly depends on real-time contingencies, and hence on the Transmission System Operator (TSO) requirements, a statistically based method is implemented. Specifically, the optimization is split into two steps. In the first step, the optimal power dispatch of the involved units is computed, and the possible DAM and proposals are identified. Then, a Monte Carlo approach is implemented to extract TSO decisions based on a user selected success percentage. Hence, for every extraction, the second step dispatches the units and computes the costs/revenues. The outcome is a Probability Density Function (PDF) of expenditure/incomes, whose analysis enables to evaluate the incomes deriving from ASM participation. To assess the effectiveness of the EMS implemented, two tests are performed on a real microgrid. Precisely, the comparison of the optimization outcomes when ASM participation is enabled or not is performed. The obtained results highlight that ASM participation definitely increases the incomes with respect to the case in which ASMs are not allowed
Analysis of lightning effects on power plant connection
No full textThe electromagnetic transients caused by lightning events are one of the most known causes of faults in the transmission lines. Many papers focused their attention on the evaluation of the effects caused by lightning events on a transmission line, but an overall analysis that takes into account, a real power system is rare to be found. In this paper, the analysis of electromagnetic transients in a connection between a power plant and large power grid is presented with a high detail of the high frequency model for each power system element. In particular, overhead lines, cables, transformers and surge arresters are modelled taking into account all the electromagnetic aspects. The simulations are performed using the well-known code PSCAD-EMTDC, taking into account, different scenarios for the lightning events, and the results show the behaviour of cables and transformers when are subjected to the aforementioned electromagnetic transients with a high level of detail
Odour emission rate estimation methods for hydrocarbon storage tanks
Full text linkAt the time to renew the Integrated Environmental Permit of oil refineries, Italian environmental institutions are now a days requiring a detailed Odour Monitoring Program, based on the use of dynamic olfactometry and atmospheric dispersion modelling. Oil refineries are complex plants and many of the VOC emission are diffuse. Despite the difficulties of describing these emission phenomena, a characterization of these emissions is needed. The paper describes the state-of-the-art methodologies for the emissions from hydrocarbon tanks, and provides an overview of possible measures and methods useful to implement an accurate odour impact assessment from refineries tank farms
Musculoskeletal rehabilitation: State-of-the-art
No full textMusculoskeletal rehabilitation has been receiving growing attention in the scientific research field taking into account the functional consequences of chronic pain that have been frequently underestimated and undertreated. The usual rehabilitative care of a wide range of diseases affecting physical function and independence in activities of daily living needs to be improved with novel approaches. In this scenario, the recent literature has highlighted the great advantages of multidisciplinary and comprehensive pain management. The Special Issue highlights the importance of advancements in musculoskeletal rehabilitation in terms of instrumental physical therapies, therapeutic exercise, osteopathic manual therapy, innovative approaches and the correlation with dentistry. Physicians should be aware of the presence of novel therapeutic approaches that are changing the clinical scenario of musculoskeletal rehabilitation
Oxygen-ozone therapy for musculoskeletal pain in rehabilitation: Evidence and future perspectives
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Biomarkers for targeted rehabilitation strategies after breast cancer: Proposal for the next-generation management of survivorship issues
Full text linkGoing 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
Variations 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
Occupational safety for panellists involved in dynamic olfactometry: A comparison of available risk assessment models
Full text linkDynamic olfactometry is now a days the most diffused technique to quantify odour emitted from industrial plants. The methodology, standardized by EN 13725:2003, involves human assessors, who are potentially exposed to hazardous pollutant present in odorous samples. A standardized method to evaluate the exposure risk for panellist during olfactometric analysis is not yet available. However, two different models to evaluate the occupation risk for panellists have been proposed within the scientific literature. Therefore, this paper reviews the available models and discusses their application to a real sample to estimate the occupation exposure risk for workers involved in olfactometric analyses. After a brief models' description, these are both applied to a real odour sample, highlighting the differences between them and the most critical aspects of applying the suggested procedures for the toxicological assessment of the exposure risk for panellists. This discussion highlights that the absence of a unique standardised assessment method and uniform reference concentrations can lead to significant differences in toxicological evaluations. In addition, the presence of compounds for which no toxicity threshold is available can cause an underestimation of the minimum dilution value to be adopted to protect the health of panellists
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