1,720,958 research outputs found
Integrated Sensor for Distributed Monitoring of Wheel Rim Temperature in Gran Turismo Cars
No full textThis paper introduces the design, characterization, and integration of an innovative temperature sensor prototype aimed at continuously monitoring the wheel rims made of composite materials used in Gran Turismo cars. The system monitors real-time temperature across multiple points on the wheel rim's surface, triggering alarms when critical thresholds are reached, which could compromise the material's chemical and physical properties. Unlike existing commercial solutions that use externally mounted infrared sensors or those integrated into tire pressure sensors, this prototype is fully integrated into the wheel without the need for external devices and directly measures the wheel rim's temperature. Operating conditions posed significant design challenges, including temperatures up to 250°C, high accelerations, and tight spatial constraints. The prototype is made of a flexible circuit adapting to the wheel rim's circular shape, and it consists of a back-end for data processing and wireless communication, temperature probes, and a signalconditioning front-end. Communication is achieved via Bluetooth Low Energy (BLE), ensuring low power consumption. The prototype underwent three testing phases: laboratory functional testing, performance analysis, and on-track tests with the sensor integrated into a wheel rim installed on a Gran Turismo car. Laboratory results demonstrated high measurement accuracy and quick response to temperature changes, and on-track tests proved the robustness of the sensor while revealing limitations in wireless communication due to electromagnetic shielding from the tire's metal parts and vehicle structure
An Integrated Co-Simulation Framework for the Design, Analysis, and Performance Assessment of EIS-Based Measurement Systems for the Online Monitoring of Battery Cells
Full text linkElectrochemical impedance spectroscopy (EIS) is widely used at the laboratory level for monitoring/diagnostics of battery cells, but the design and validation of in situ, online measurement systems based on EIS face challenges due to complex hardware–software interactions and non-idealities. This study aims to develop an integrated co-simulation framework to support the design, debugging, and validation of EIS measurement systems devoted to the online monitoring of battery cells, helping to predict experimental results and identify/correct the non-ideality effects and sources of uncertainty. The proposed framework models both the hardware and software components of an EIS-based system to simulate and analyze the impedance measurement process as a whole. It takes into consideration the effects of physical non-idealities on the hardware–software interactions and how those affect the final impedance estimate, offering a tool to refine designs and interpret test results. For validation purposes, the proposed general framework is applied to a specific EIS-based laboratory prototype, previously designed by the research group. The framework is first used to debug the prototype by uncovering hidden non-idealities, thus refining the measurement system, and then employed as a digital model of the latter for fast development of software algorithms. Finally, the results of the co-simulation framework are compared against a theoretical model, the real prototype, and a benchtop instrument to assess the global accuracy of the framework
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
Ruolo della fisica della matrice extracellulare come determinante della progressione della malattia neoplastica
Full text linkRuolo della fisica della matrice extracellulare nello sviluppo del tumor
Sistema automatico per la caratterizzazione dell'impedenza sul ciclo di vita delle batterie agli ioni di litio secondo lo standard IEC 62660
No full textQuesta tesi consiste nella realizzazione di un sistema automatico per la caratterizzazione del ciclo di vita di una cella agli ioni di litio attraverso la misurazione di un parametro prestazionale fondamentale: l’impedenza interna.
Si parte con uno studio preliminare sulla struttura chimica e sul funzionamento delle batterie agli ioni di litio, in quanto sono una tecnologia di batterie che presenta un’elevata densità energetica e ottime prestazioni in termini di durata. Grazie a queste proprietà le celle agli ioni di litio vengono utilizzate nel settore automobilistico per la realizzazione di veicoli elettrici. Per ottimizzarne l’efficienza è importante stimare lo State Of Charge. Ci sono diversi metodi per valutare questo parametro, in particolare, attraverso la tecnica di spettroscopia d’impedenza elettrochimica (EIS).
Sulla base dello standard internazionale IEC 62660, che descrive e specifica prove di valutazione dei parametri prestazionali e test di durata delle batterie, si propone un protocollo che mira a valutare l’invecchiamento e il deterioramento delle celle attraverso le misure d’impedenza in varie condizioni che dipendono da diversi livelli di SoC e dal numero di cicli a cui vengono sottoposte le celle.
Per mettere in pratica questo protocollo è necessario allestire un set up di misura che permetta di eseguire dei cicli di carica e scarica e di misurare l’impedenza interna della cella. Questo banco di misura è costituito da due strumenti principali che sono il Source Meter Unit e il Chemical Impedance Analyzer che vengono programmati da remoto presso il dipartimento DEI dell’Università di Bologna (Campus di Cesena)
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
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