1,720,971 research outputs found
Dispositivo per artroscopia ed operazioni similari
No full textLa presente invenzione ha per oggetto un dispositivo per artroscopia ed operazioni
similari del tipo precisato nel preambolo della prima rivendicazione. L’invenzione concerne un dispositivo utilizzabile in artroscopia o in qualsiasi altra
operazione di diagnostica realizzata in endoscopia, ossia in una qualsiasi
esplorazione medica che permetta di visualizzare l'interno di un corpo.
Inoltre, il dispositivo per artroscopia, oltre che per la diagnostica, è utilizzabile
per l'esecuzione d’interventi chirurgici o, in alternativa, come strumento di supporto durante un intervento chirurgico
Realizzazione di strutture micro fabbricate tramite tecnica di micro Laser Sintering per applicazione alla Tissue Engineering
No full textThe PAM2 system: a multilevel approach for fabrication of complex three-dimensional structures
No full textPurpose – The traditional tissue engineering approach employs rapid prototyping systems to realise microstructures (i.e. scaffolds) which recapitulate the function and organization of native tissues. The purpose of this paper is to describe a new rapid prototyping system (PAM-modular micro-fabrication system, PAM2) able to fabricate microstructures using materials with different properties in a controlled environment. Design/methodology/approach – Computer-aided technologies were used to design multi-scale biological models. Scaffolds with specific features were then designed using custom software and manufactured using suitable modules. In particular, several manufacturing modules were realised to enlarge the PAM2 processing material window, controlling physical parameters such as pressure, force, temperature and light. These modules were integrated in PAM2, allowing a precise control of fabrication parameters through a modular approach and hardware configuration. Findings – Synthetic and natural polymeric solutions, thermo-sensitive and photo-sensitive materials can be used to fabricate 3D scaffolds. Both simple and complex architectures with high fidelity and spatial resolution ranging from ^15mm to ^200mm (according to ink properties and extrusion module used) were realised. Originality/value – The PAM2 system is a new rapid prototyping technique which operates in controlled conditions (for example temperature, pressure or light intensity) and integrates several manufacturing modules for the fabrication of complex or multimaterial microstructures. In this paper it is shown how the system can be configured and then used to fabricate scaffolds mimicking the extra-cellular matrix, both in its properties (i.e. physic- chemical and mechanical properties) and architecture
Characterization of Additive Manufactured Scaffolds
No full textAt the increasing pace with which additive manufacturing technologies are advancing, it is possible nowadays to fabricate a variety of three-dimensional (3D) scaffolds with controlled structural and architectural properties. Examples span from metal cellular solids, which find application as prosthetic devices, to bioprinted constructs holding the promise to regenerate tissues and organs. These 3D porous constructs can display a variety of physicochemical and mechanical properties depending on the used material and on the design of the pore network to be created. To determine how these properties change with changing the scaffold’s design criteria, a plethora of characterization methods are applied in the biofabrication field. In this chapter, we review the most common techniques used to characterize such fabricated scaffolds by additive manufacturing technologies
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
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