983 research outputs found
Editorial Introduction on Proceedings of the 2015 International Congress on Ultrasonics, 2015 ICU Metz
No full textAbstractA brief summary of the 2015 International Congress on Ultrasonics is presented. The 2015 ICU has taken place in Metz, France, at the Arsenal and was hosted by Georgia Tech Lorraine in collaboration with the French Acoustical Society. The congress hosted a record number of 700 participants. The report focuses on the awards presented during the congress, the invited speakers and some statistics. Other details can be found in reports available on the congress website. The author N. F. Declercq, president of 2015 ICU and Editor of the congress proceedings, wishes to publish the congress proceedings in loving memory of his father Maurice Alois who suddenly passed away 5 weeks after the end of the congress
Numerical simulations of ultrasonic polar scans
No full textNumerous experiments (Van Dreumel et at 1981, Degrieck et at 1994, Degrieck 1996, Declercq et al 2001, Degrieck et at 2003) have convinced the authors that ultrasonic polar scans are a promising tool for, non-destructive characterization of fiber reinforced composites. However, because of the requirement to invert experimental data to extract quantitative information (Degrieck et at 2003), numerical simulations are mandatory Such simulations have been developed before for single layered fiber reinforced composites. Nevertheless, since the vast majority of composites are multi-layered, the development of extended numerical models is needed. Such model is presented, together with a presentation of numerical simulations of ultrasonic polar scans for multi-layered composites. It is also shown that the polar scan of a fabric reinforced composite is quite different from a polar scan of (0degrees/90degrees)-stacked unidirectional layers
Treatment of unruptured intracranial aneurysms : a surgical long-term evaluation for preoperative predictive analytics
No full textAuthor Dr.med.univ. Nico Henrique Stroh-HollyDissertation Johannes Kepler Universität Linz 202
Enough of 'tough': Youth Justice in Scotland
No full textHow can we build an effective youth justice system that enjoys public confidence while recognising that children must be redeemable?Nico Juetten presents a view from Scotland, considering the challenges to the children's hearings system Copyright (c) 2009 The Author. Journal compilation (c) 2009 ippr.
Ciò che resta della terza dimensione
No full textThe s.c. «third dimension» is one of the first definitions given in the sociological arena to define the development of a ate element that was not identifiable with generalist instances of the state or with those particularistic of the market. Deriving its conceptualization from the Husserlian theory, Ardigò through the use this approach emphasizing the need to reconstruct the crisis through new forms of transaction between the social system and life-worlds. The use of this conceptualization led to the identification of these intermediary organizations between different systems. The text takes a brief overview of the third dimension organizations and the way how they operate the reconciliation between inter-subjectivity and super-ordination present in the systemic sense. It is proposed a scheme of interpretation, drawn from the author in question, through which classifying not merely the organization but the possible interconnections between micro and macro and their consequences. It is concluded that the abandon of the analytical perspective proposed by Ardigò, primarily for the affirmation of a vision of an economic nature, was determined both by the theoretical vulgate established around of the 90, and the difficulty in operationalizing a definition that owed much to the knowledge from the phenomenology of the Bolognese scientist
Using Nano-mechanics and Surface Acoustic Wave (SAW) for Disease Monitoring and Diagnostics at a Cellular Level in Red Blood Cells
No full textAbstractA popular approach to monitoring diseases and their diagnosis is through biological, pathological or immunological characterization. However, at a cellular level progression of certain diseases manifests itself through mechanical effects as well. Here, we present a method which exploits localised flow; surface acoustic wave (SAW) induced acoustic streaming in a 9μL droplet to characterize the adhesive properties of red blood cells (healthy, gluteraldehyde treated and malaria infected) in approximately 50seconds. Our results show a 79% difference in cell mobilization between healthy malaria infected RBCs (and a 39% difference between healthy and treated ones), indicating that the method can serve as a platform for rapid clinical diagnosis; where separation of two or more different cell populations in a mixed solution is desirable. It can also act as a key biomarker for monitoring some diseases offering quantitative measures of disease progression and response to therapy
Alla ricerca della sovranità nello studio di Carlo Lavagna sulle figure giuridiche soggettive
No full textIl presente contributo ripercorre il saggio di Carlo Lavagna, Basi per uno studio delle figure giuridiche soggettive contenute nella Costituzione italiana, allo scopo di ricercare il filo conduttore della sovranità in tutte le figure giuridiche soggettive sia che esse siano solo raccomandate, sia che siano garantite o anche tutelate dalla Costituzione, secondo la classificazione dell’Autore. Tale analisi è stata preceduta da un breve richiamo al metodo di indagine dell’Autore e alla sua concezione quadrangolare della democrazia.This contribution reinterprets the essay by Carlo Lavagna, Basis for a study of the subjective juridical figures contained in the Italian Constitution, in order to search for the sphere of sovereignty in all subjective legal figures whether they are only recommended, whether they are guaranteed or also protected by the Constitution, according to the classification of the Author. This analysis was preceded by a brief recall of the Author's method of investigation and its quadrangular concept of democracy
Acoustic Resonator Optimisation for Airborne Particle Manipulation
No full textAbstractAdvances in micro-electromechanical systems (MEMS) technology and biomedical research necessitate micro-machined manipulators to capture, handle and position delicate micron-sized particles. To this end, a parallel plate acoustic resonator system has been investigated for the purposes of manipulation and entrapment of micron sized particles in air. Numerical and finite element modelling was performed to optimise the design of the layered acoustic resonator. To obtain an optimised resonator design, careful considerations of the effect of thickness and material properties are required. Furthermore, the effect of acoustic attenuation which is dependent on frequency is also considered within this study, leading to an optimum operational frequency range. Finally, experimental results demonstrated good particle levitation and capture of various particle properties and sizes ranging to as small as 14.8μm
The Understood Author: A hermeneutical exploration of audiences interpretation of the author as productive practices behind a text
No full textin English This project builds on the tradition of audience research that theoretically and empirically established that meaning is formed in the negotiation between the text and the reader, that the audiences are agentic, their interpretation of media is contextual and situated, and that they have the potential to resist the media. It argues that it is important to explore people's attention to different sources: who is listening, to whom, and why - and asks how people understand the notion of an author that they encounter in the interpretation of factual media texts, and how this interpretation is brought back into the interpretative act. The thesis subscribes to philosophical hermeneutics as an overarching theoretical as well as methodological framework to devise a concept of an understood author that is a result of the interpretative act, where the author imagined and anticipated by the reader (in the form of prior knowledge and prejudices) is encountered and actualised by the author inscribed into the text. I carried out 28 in-depth face-to-face interviews with Czechs born between 1948-1963 to explore participants' experiences and relationship with media and media authors. Employing hermeneutical analysis, the focus is not to capture what is an author, but how it happened to be so. The..
Operando detection and quantification of damage in the automotive components made of polyamide based composite reinforced with continuous fibres submitted to the fatigue-pre and/or post-impact by advanced ultrasonic techniques
No full textLa détection et la caractérisation des endommagements dans des composantes automobiles fabriquées en matériaux composites restent un souci majeur que les constructeurs automobiles cherchent à confronter. Le projet de thèse s'inscrit dans cette thématique et a comme but l'analyse qualitative et quantitative des endommagements induits par différentes sollicitations dans un composite à matrice polyamide 66/6 renforcé de fibres de verre tissées sergé 2/2. Pour cela, des essais d’impact à faible vitesse à différents niveaux d’énergie, des essais de fatigue en traction-traction ainsi que des essais d’impact post-fatigue, sont réalisés. Une méthodologie expérimentale qui repose sur l'utilisation des méthodes de contrôle non-destructif est établit et a pour but l’évaluation de l’endommagement induit par différents chargements. Différents outils sont utilisés dans cette étude, à savoir : la microscopie optique, la microscopie électronique, la tomographie aux rayons X, les ondes guidées (les ondes de Lamb), l'imagerie C-Scan par propagation des ondes de volumes et d'autres outils ultrasonores. En effet, les mécanismes d’endommagement liés aux multiples sollicitations sont observés et leurs degrés de propagation en fonction du type et du niveau de chargement sont examinés. Les propriétés résiduelles sont estimées par le biais de la vitesse de propagation des ondes de volume. En outre, une investigation basée sur la propagation des ondes de Lamb est menée. A l'issu de cette étude, des indicateurs d'endommagement, permettant de quantifier l'état d'endommagement induit dans chaque échantillon inspecté, sont proposés. Finalement, des essais de traction quasi-statique sont réalisés pour la prédiction des propriétés résiduelles post-chargement.The detection and characterization of damage in automotive components made of composite materials remains a major concern that automotive manufacturers are seeking to address. The aim of this thesis project is to qualitatively and quantitatively analyze the damage induced by different solicitations in a polyamide 66/6 based composite reinforced with 2/2 woven glass fibers intended for automotive applications. For this purpose, low-velocity impact tests at different energy levels, tensile-tensile fatigue tests as well as impact post-fatigue tests are conducted. An experimental methodology relying on the use of non-destructive testing methods (NDT) is established and aims at the assessment of the damage induced by different types of loads. Several tools are used in this study, namely: optical microscopy, X-ray tomography, guided waves (Lamb waves), C-Scan imaging and other ultrasonic tools. The damage mechanisms associated with the multiple loading are observed and their degrees of propagation as a function of the type and level of loading are examined. The stiffness matrix components are estimated by means of the velocity of propagation of the bulk waves. Furthermore, a Lamb waves-based investigation is conducted. By estimating the velocity of propagation of the waves, velocity profiles as a function of the angle of emission/reception are obtained. As a result of this study, several damage indicators are proposed to quantify the damage state induced in each inspected specimen. A good correlation between all experimental results is found indicating the efficiency of the developed Lamb waves-based method. Finally, quasi-static tensile tests are carried out to estimate the post-loading residual properties
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