177,248 research outputs found
Potere e libertà nella rete
No full textIl contributo si propone di analizzare alcune linee di tendenza nel rapporto rapporti tra potere e libertà in Internet: dopo aver sottoposto a critica alcune recenti ricostruzioni che enfatizzano la dimensione sociale e comunitaria della rete, lo scritto si sofferma su alcune problematiche attinenti al rapporto tra i privati utenti della rete, i grandi intermediari e i gestori delle piattaforme, e il potere pubblico. In particolare, per quanto attiene al ruolo di provider e gestori, si evidenzia l’esigenza di superare il mito della loro neutralità senza per questo configurare in capo ad essi forme di responsabilità editoriale, e valorizzando il ruolo che in questo senso può essere svolto dalle procedure c.d. di notice and take down; per quanto attiene al rapporto col potere pubblico, si valuta favorevolmente il tendenziale abbandono del ricorso allo strumento penale, e si evidenzia l’esigenza di privilegiare interventi normativi sulle modalità di diffusione dei contenuti, con specifico riferimento al tema della profilazione degli utenti finalizzata all’invio di materiale informativo, e all’esigenza di contrastare modalità non trasparenti di diffusione, quali quelle che si avvalgono di bot e fake account.The paper analyzes current trends in the relationship between Public Power and Internet Freedom. After having challenged recent theories about the social dimension of the Internet, the paper focuses on issues related to the relationship between private users, Internet intermediaries and platform providers, and Public Power. In particular, as far as the role of Internet intermediaries and providers is concerned, the Author argues that time is ripe to dispel the myth of their neutrality but warns that they should held liable as editors/publishers not just for this reason, and that the so called “notice and take down procedures” may play an important role in the field. As far as the relationship between Internet providers and Public Power is concerned, the Author agrees with those recommending setting aside the use of criminal law and highlights the need to support regulation on how contents are shared −considering the specific issue of users profiling− and to contrast non-transparent methods of dissemination of information such as those using bots and fake accounts
Spin-Dependent Effects in Helical Molecular Systems with Rashba-Like SpinOrbit Interaction
No full textStrong spin-selective effects have been recently observed in both photoemission and electrical transport exper-iments in biomolecular systems, opening fascinating possibilities for interfacing semiconductor and biomolecular systems to create highly efficient spintronics devices. From the theoretical and experimental point of view there are strong suggestions that molecular chirality is playing a crucial role. In this study we extend a previously formulated model (R. Gutierrez, E. Díaz, R. Naaman, G. Cuniberti, Phys. Rev. B 85, 081404 (2012)) describing the linear propagation of a charge with spin along the axis of a helical charge distribution. We explore different parameter regions and show that a strong negative spin polarization as observed in the previously mentioned experiments can be obtained with reasonable values of both the electronic coupling elements and the helical field induced spinorbit interaction
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe 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
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