1,720,955 research outputs found
The importance of aeroelasticity in estimating multiaxial fatigue behaviour of large floating offshore wind turbine blades
Full text linkThe trend toward longer blades in offshore wind turbines poses a significant structural design challenge, given their flexibility and larger load variations. While the study of aeroelastic models of very long blades has gained attention in recent discussions, there is a gap in comprehensive studies examining the impact of different aeroelastic models on fatigue analysis. This study focuses on a comparative evaluation of different aeroelastic models under identical conditions, with a specific focus on multiaxial fatigue. The primary objective is to compare and assess the discrepancies in predicting the lifetime, spatial damage distribution, and critical wind speed conditions. The findings of this study highlight a substantial impact of the aeroelastic model selection on the expected lifetime, revealing durations of 23.2, 3.7, and 1.2 years for the geometrically exact beam theory, Euler-Bernoulli beam, and rigid body assumption. In contrast, the spatial distribution of fatigue damage and critical wind speed conditions remain relatively stable across the models
The Importance of Empirical Particle Motion Measurements for Monitoring Underwater Noise from Wave Energy Converters
No full textThe energy transition to achieve NetZero objectives by 2050 2050 needs a sharp increase of Marine Renewable Energies (MREs). This growth must ensure environmental sustainability while aligning with biodiversity conservation goals, as outlined in the EU Biodiversity Strategy. However, significant knowledge gaps persist regarding the impacts of MREs on marine ecosystems, leading to uncertainties in assessing cumulative effects on marine organisms. Comprehensive monitoring and data collection are crucial to enable the sustainable development of MREs. Underwater noise is a recognized stressor associated with MRE devices, including Wave Energy Converters (WECs). It is also classified as an environmental quality indicator under Descriptor 11 of the Marine Strategy Framework Directive (EU), mandating its monitoring during anthropogenic activities as a potential pollutant for marine ecosystems. Standards for MRE devices noise assessment are now available (IEC TS 62600-40). Traditionally, underwater noise monitoring has focused on scalar pressure measurements. However, particle motion, a vectorial measure representing the acceleration or velocity of water particles caused by sound waves, is equally significant, especially in shallow water environments where WECs and their mooring systems may influence soundscapes more through vibration than pressure. Many marine organisms perceive sounds predominantly as particle motion rather than pressure due to their physiological characteristics (i.e. fish and invertebrates). This highlights the need to broaden current noise monitoring frameworks, which primarily focus on pressure, to incorporate particle motion measurements.
This paper emphasizes the importance of particle motion as a critical component of underwater noise monitoring for WEC applications. We present initial findings from empirical measurements of both particle motion and pressure conducted at a pilot site in the Mediterranean Sea using an underwater acoustic vector sensor (M20-105 system, GTI Geospectrum Technologies Inc.). Acoustic data were collected near the ISWEC (Inertial Sea Wave Energy Converter) off the coast of Pantelleria, Italy, offering novel insights into the underwater noise characteristics generated by WECs and the role of particle motion in their assessment
Sistema di ormeggio adattivo per corpo galleggiante
No full textUno scopo generale della presente invenzione è realizzare sistemi di ormeggio per corpi galleggianti che consentano al corpo galleggiante di permanere sul pelo libero del bacino idrico. Un altro scopodella presente invenzione è quello di realizzare sistemi di ormeggio per corpi galleggianti che consentano al corpo galleggiante di orientarsi correttamente rispetto alla posizione del sole. Questi ed altri scopi e vantaggi, che saranno compresi meglio in seguito, sono raggiunti secondo la presente invenzione avente le caratteristiche enunciate nella rivendicazione indipendente. Forme di realizzazione preferenziali dell’invenzione sono definite nelle rivendicazioni dipendenti.
In sintesi, secondo un primo aspetto dell’invenzione, la presente invenzione si riferisce a un sistema di ormeggio per corpo galleggiante configurato per essere disposto in un bacino idrico che comprende almeno tre mezzi di collegamento e orientamento, ciascuno avente una prima estremità predisposta per essere collegata al corpo galleggiante e una seconda estremità predisposta per essere collegata in una posizione fissa al bacino idrico. Inoltre, il sistema comprende mezzi di avvolgimento e svolgimento per l’avvolgimento e lo svolgimento degli almeno tre mezzi di collegamento e orientamento per cui gli almeno tre mezzi di collegamento e orientamento sono ciascuno avvolgibile e svolgibile, definendo ciascuno una lunghezza operativa tra le rispettive prima e seconda estremità. Primi mezzi sensori sono predisposti per misurare escursioni batimetriche del bacino idrico e un sistema di controllo è predisposto per comandare i mezzi di avvolgimento e svolgimento e regolare la lunghezza operativa di ciascuno degli almeno tre mezzi di collegamento e orientamento in base alle escursioni batimetriche misurate dai primi mezzi sensori, consentendo pertanto al corpo galleggiante di permanere sul pelo libero del bacino idrico. Secondo un secondo aspetto, l’invenzione comprende un corpo galleggiante comprendente un sistema di ormeggio
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
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
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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