1,721,382 research outputs found
On the influence of nodes’ characteristic in inter-organizational innovation networks structure
No full textThis paper studies inter-organisational innovation networks,
investigating the relations between the structure of the connections among
members and a given node’s characteristic. Such relations are used to provide
some insights into the attitude of network innovation. We propose an original
methodology that considers nodes belonging to two different classes detecting
the available configurations. The intensity of connections, as an additional layer
of information, is also included to examine its relative influence on the network
topology. We complete the analysis through the introduction of a qualitative
intensity/connectance matrix that attempts to connote the innovation attitude of
the network.We test the methodology on a real case study, discussing the detected
configuration and the implication in terms of innovation attitude
A single-centre experience on endovascular repair of non-infected extracranial internal carotid artery pseudoaneurysms
No full textIn the period ranging from 2006 to 2010, 5 endovascular interventions for carotid pseudoaneurysm (4 post-carotid endarterectomy [post-CEA] and 1 posttraumatic), without signs of infection, were carried out. All patients were neurologically asymptomatic. A covered stent was used in 4 cases. The fifth patient, undergoing a third endovascular procedure after a re-do open surgical repair of a post-CEA pseudoaneurysm, was treated with a bare stent. The technical success rate was 100%. A type 1 endoleak at the end of the procedure was observed in 1 patient, but it disappeared before discharging. No perioperative neurologic events occurred. At the most recent mean follow-up of 24 months, all patients are alive, without neurologic symptoms, and all have maintained patency of the internal carotid artery and are pseudoaneurysm-free
A Single-Center Experience With Phoenix Atherectomy System in Patients With Moderate to Heavily Calcified Femoropopliteal Lesions
No full textPurpose: To evaluate efficacy and safety of a new rotational atherectomy (RA), the Phoenix AtherectomyTM System, for the treatment of de novo and re-stenotic or occlusions atherosclerotic moderate-heavily lesions of the femoro-popliteal axis. Material and methods: From January 2015 to August 2017, 52 patients with heavily calcified femoro-popliteal lesions causing severe stenosis or occlusions were enrolled in our center to be treated using Phoenix catheters. Primary endpoints of this study were acute efficacy and safety at 30 days. Secondary endpoints were freedom from restenosis and target lesion revascularization (TLR)/target vessel revascularization (TVR) at 1-, 6- and 12- months. Results: The mean lesion length was 9.2 cm (range 5-23 cm). The lesions were located in superficial femoral artery (SFA) in 61.5% (Fig. 1-A), in popliteal artery in 21.1% and involved femoral-popliteal axis in 15.4%. A primary technical success was achieved in 51/52 patients, with an optimal working channel after RA alone. Using Kaplan-Meyer analysis, primary vessel patency rates at 1, 6 and 12 -months was 96.1%, 86.5% and 76.9% respectively. Assisted primary patency at 1, 6- and 12 -months was 100%, 90.3% and 86.5% respectively. Conclusions: Recanalisation with the Phoenix Atherectomy System is simple and safe, with a high technical success rate
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
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Iron oxidation state in the Fe-rich layer and silica matrix of Libyan Desert Glass: a high-resolution XANES study
No full textLibyan Desert Glass (LDG) is an enigmatic type of glass that occurs in western Egypt in the Libyan Desert. Fairly convincing evidence exists to show that it formed by impact, although the source crater is currently unknown. Some rare samples present dark-colored streaks with variable amounts of Fe, and they are supposed to contain a meteoritic component. We have studied the iron local environment in an LDG sample by means of Fe K-edge high-resolution X-ray absorption near edge structure (XANES) spectroscopy to obtain quantitative data on the Fe oxidation state and coordination number in both the Fe-poor matrix and Fe-rich layers. The pre-edge peak of the high-resolution XANES spectra of the sample studied displays small but reproducible variations between Fe-poor matrix and Fe-rich layers, which is indicative of significant changes in the Fe oxidation state and coordination number. Comparison with previously obtained data for a very low-Fe sample shows that, while iron is virtually all trivalent and in tetrahedral coordination ([4]Fe3+) in the low-Fe sample, the sample containing the Fe-rich layers display a mixture of tetra-coordinated trivalent iron ([4]Fe3+) and penta-coordinated divalent iron ([5]Fe2+), with the Fe in the Fe-rich layer being more reduced than the matrix. From these data, we conclude the following: a) the significant differences in the Fe oxidation state between LDG and tektites, together with the wide intra-sample variations in the Fe-oxidation state, confirm that LDG is an impact glass and not a tektite-like glass; b) the higher Fe content, coupled with the more reduced state of the Fe, in the Fe-rich layers suggests that some or most of the Fe in these layers may be directly derived from the meteoritic projectile and that it is not of terrestrial origin
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
Rodolicoite e grattarolaite, two new phosphate minerals from Santa Barbara Mine, Italy
No full textGrattarolaite and rodolicoite, two new anhydrous iron phosphates, were found at Santa Barbara lignite mine as reddish-brown nodules. They occur as small crystallites (< 1000 Angstrom), associated in fine-scale intergrowth that prevent the measurement of physical properties. Grattarolaite is trigonal, with space group R3m; rodolicoite is also trigonal, but with space group P3(1)21. Cell dimensions, calculated from X-ray powder patterns, are: grattarolaite a = 7.994(4), c = 6.855(4) Angstrom, V = 379.4 Angstrom(3), Z = 3; rodolicoite a = 5.048(3), c = 11.215(8) Angstrom, V = 247.5 Angstrom(3), Z = 3. The chemical data, obtained by transmission electron microscope microanalysis, give the composition Fe2.99P1.01O7.00 for grattarolaite and Fe1.04P0.96O4.00 for rodolicoite. Infrared spectroscopy and thermal analysis confirm the anhydrous nature of both minerals
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