1,721,042 research outputs found
On the microstructure and superelastic evolution of laser annealed thin NiTinol wires
No full textShape setting is a crucial step of the production route of shape memory alloys (SMAs) elements for fixing their functional properties. For thin SMA wires, this peculiar setting can be performed by a laser beam scanning the wire length. In the present work the correlation among the functional properties, such as stress-strain curves, the microstructural properties and the laser power was studied on 100 μm pseudoelastic NiTi wire. A comparison between the performances of the laser treated and the commercial wires was discussed. It can be stated that the wire responses can be modulated as a function of the laser power; the optimal laser condition can induce functional properties at least comparable to the ones of the wire conventionally treated in a furnace. Laser induced superelasticity was obtained at room temperature and the corresponding microstructure suggests a texture effect associated with the directional and fast heating induced by the laser beam scan. A favorable condition for extended stress induced plateau lengths, compared to the one of the commercially available furnace treated wires, was induced by the laser scan
Laser shape setting of superelastic nitinol wires: Functional properties and microstructure
No full textShape setting is one of the most important steps in the production route of Nitinol Shape Memory Alloys (SMAs), as it can fix the functional properties, such as the shape memory effect and the superelasticity (SE). The conventional method for making the shape setting is performed at 400-500°C in furnaces. In this work, a laser beam was adopted for performing straight shape setting on commercially available austenitic Nitinol thin wires. The laser beam, at different power levels, was moved along the wire length for inducing the functional performances. Calorimetric, pseudo-elastic and microstructural features of the laser annealed wires were studied through differential scanning calorimetry, tensile testing and high energy X-ray diffraction, respectively. It can be stated that the laser technology can induce SE in thin Nitinol wires: the wire performances can be modulated in function of the laser power and improved functional properties can be obtained
CuZr Based Shape Memory Alloys: Effect of Co on the Martensitic Transformation and the Microstructure
No full textIn this work we report on the alloying of Co, in the place of both Cu and Zr, in CuZr high temperature shape memory alloy HTSMA. Characteristic temperatures of the martensitic transformation and thermal cycling stability of CuZr alloys with different Co contents were detected by calorimetric measurements. The microstructure evolution was investigated by scanning electronic microscopy
Tecnologie Internet-based e gestione della supply chain: impatto, criticità e miglioramenti attesi
No full textIl lavoro illustra i principali driver di cambiamento in tema di configurazione e gestione della supply chain che hanno portato a enfatizzare la rilevanza dei flussi informativi e, di conseguenza, l’importanza delle tecnologie Internet-based. Inoltre si approfondisce il supporto che Internet può fornire nella gestione dei principali processi di business interaziendali e le criticità associate a un suo appropriato utilizzo
Portali aziendali B2B in ambito bancario: opportunità, esprienze e prospettive
No full textIl capitolo si inserisce in un libro realizzato con la finalità di mostrare a distanza di qualche anno dall'ingresso di internet nelle principali economie industrializzate l'impatto di queste all'interno dei business, nella fattispecie di analisi, in quella inerente la relazione banca-impresa
Un’esperienza di collaborazione con i fornitori. Il caso ABB Sace
No full textIl capitolo descrive, attraverso l'analisi di un caso aziendale, come le tecnologie possono contribuire al miglioramento dei processi di fornitura. In particolare vengono evidenziate le opportune razionalizzazioni che si possono perseguire nei processi di acquisto e i relativi miglioramenti delle performance
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Accentramento e miglioramento delle attività di acquisto attraverso l’e-procurement: il caso Techint/Tenaris
No full textNo abstract availabl
Variations on the Author
Get PDF“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
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