1,721,306 research outputs found
Rischio d’impresa, governance e innovazione. Il caso dei produttori di macchine per la ceramica del distretto industriale di sassuolo
No full textCorporate Digital Responsibility: A Board of Directors May Encourage the Environmentally Responsible Use of Digital Technology and Data: Empirical Evidence from Italian Publicly Listed Companies
No full textThis paper presents a framework for our hypotheses that the independence of a board of directors and the use of digital technology might influence the way a corporation performs environmentally. For empirical verification of our thesis, we take a sample of 53 publicly listed Italian companies and look at data on their board composition, greenhouse gas emissions, and expenditures for the use of digital technologies of Enterprise Resource Planning (ERP) over a period of five years. What emerges from the test partially supports our predictions. In particular, we find that a higher level of board independence is associated with better environmental performance. There is no direct, statistically significant association between the use of digital technologies and environmental performance, so a greater use of digital technologies is not, in itself, sufficient to improve the environmental performance of a firm. However, our empirical analyses find that environmental performance is positively influenced by the use of digital technologies in firms that include a proportionately high number of independent directors on their boards. This research improves our understanding of antecedents of Corporate Digital Responsibility (CDR), showing how the share of independent directors on a board has a positive impact on CDR, understood here as the set of practices and behaviours that help an organisation use data and digital technologies in ways that are environmentally responsible
Nonlinear lower hybrid wave equations in collisional tokamak plasmas
Full text linkA new set of coupled integro-differential nonlinear lower hybrid (LH) wave equations is derived within the framework of a kinetic theory coupled to the Maxwell equations to study the parametric instabilities (PIs) produced by LH waves in collisional tokamak plasma. Previous models of nonlinear LH wave equations have been significantly improved. The wave equations derived overcome the limits and incorrectness of the standard theory of the PI in inhomogeneous plasma. They allow us to treat the full spectrum in the parallel and poloidal wavenumber of the coupled LH power wave, diffraction effects and possible cascade phenomena, which are elements of the nonlinear LH physics ignored in the standard PI theory. Numerical solutions of the new nonlinear LH wave equations are proposed. The relevant LH frequency spectra produced by PI are calculated, exhibiting characteristic features of PI observed in LH experiments. It is shown that the LH sideband amplification can be overestimated by orders of magnitude by the standard theory of PI. A benchmark of the new model is provided for spatially homogeneous plasmas. The role of the collisions for PI has been assessed. We demonstrate that previous analyses significantly overestimated their stabilization effect
Suppression of parametric instabilities induced by lower hybrid waves
No full textIn the framework of the study of parametric instabilities involving lower hybrid wave propagation in a magnetized plasma, this work presents a new nonlinear parametric dispersion equation, based on a kinetic model, taking into account the collisional effects, useful to analyze the instabilities emerging in the outer layers of a tokamak plasma. For typical parameters of present day LHCD experiments, we compare the numerical solutions of the full parametric dispersion equation in collisionless plasma with the numerical solutions obtained in both collisional and collisionless case, considering only the particle dynamics parallel to the equilibrium magnetic field. The role of the electron temperature and the ion composition are also investigated in order to find outer plasma conditions useful to suppress the parametric instabilities in future fusion reactor scenarios. © 2017 IOP Publishing Ltd
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
On a Multi-Objective Approach in the Non-Uniform Symmetrical Linear Antenna Array Design
No full text"A multi-objective approach is applied to the design of. linear arrays of antennas. The adopted procedure is based on a. standard implementation of the Controlled Elitist Non-. Dominated Sorting Genetic Algorithm-II. Non-uniform and. symmetrical broadside arrays are considered, with both uniform. and non-uniform spacing. The work focuses on the problem of. optimizing simultaneously the side lobe level and the main beam. width, investigating how and in which cases solutions obtained by. the genetic algorithm can approximate, or outperform, the. optimal Pareto front for the uniform spacing case computable by. the Dolph-Chebyshev design method.
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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