1,720,958 research outputs found
La Conferenza Stato-regioni tra teoria e prassi alla luce della giurisprudenza costituzionale
Get PDFIl progressivo sviluppo del principio cooperativo nelle esperienze federali. I raccordi cooperativi nell'ordinamento interno, tra primo e secondo regionalismo. L'evoluzione del sistema delle Conferenze; la struttura, le attribuzioni e i meccanismi di funzionamento della Conferenza Stato-regioni. La Conferenza Stato-regioni dalla "teoria" alle prassi dell'ultimo quinquennio. Leale collaborazione e sistema delle Conferenze nella recente giurisprudenza costituzionale. Considerazioni conclusive alla luce delle recenti proposte di riforma del sistema delle Conferenze
Comparison between Joining Technologies for Polymeric Films
No full textAbstractThe packaging industry makes extensive use of thermoplastic polymers in film format that can have a thickness of less than 100 microns. Joining such thin films requires a tight control of several process parameters and of material homogeneity. Among the available technologies, heat sealing is widely applied along with solvent based gluing that is the more traditional technique.In this paper, welds of thin polymeric films have been produced by means of a solid-state Laser source and the solvent based technique with the aim to compare their performances. Thin films specimens were cut from commercial rolls used in labelling applications or prepared from purposely-designed polymer blends by compression between the heated plates of a laboratory press. Blends prepared in laboratory using poly(lactic acid) or poly(lactide) blended with different percentage of an impact modifier were designed to test the sealing properties under laser welding irradiation respect to solvent bonding.The solid-state laser source allows a short process time without direct contact between tool and part and thus without contamination of the film. Solvent gluing tests, by dispersing a controlled amount of solvent with a micro syringe by hand, were carried out. The material was characterized by means of differential scanning calorimetry, DSC. Changes along the welded lines by laser radiation and solvent gluing were characterized by micro FTIR and micro Raman techniques. An Instron 5966 testing machine, in the tensile mode, was used for measuring the strengths of the bonded films
Laser transmission welding of polylactide to aluminium thin films for applications in the food-packaging industry
No full textLaser transmission welding is a suitable technology to join thin films of similar or dissimilar materials without any addition of chemical solvents or adhesives. This process represents a very important opportunity in the case of packaging applications (for example in food and pharmaceutical sectors) where the realisation of strong welds by avoiding the contact between the thermal source and the processed materials and, furthermore, without using any third material that could contaminate the contents, is reliable and relevant.
The aim of this paper is to prove the feasibility of the laser transmission welding of polylactide to aluminium thin films by means of laser transmission welding through the use of a low power pulsed wave fibre laser. Laser joint samples were realised, analysed by optical microscopy to reveal possible defects and to evaluate the weld width and tested to measure the mechanical tensile strength. An accurate relationship between the joint quality and both the welding speed and the k-factor, which represents the delivered energy per unit length and affects the bonding mechanism at the interface, was determined. The achieved feasibility area is extremely narrow and possible only for the higher value of the average power. The joint tensile strength was proven to be in a proportional relationship with the effective bonded area and reached satisfactory values
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
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
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe 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
Get PDFWe 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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