8 Tesi di dottorato

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8.1 Tesi di dottorato 156

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Spectral measurements of cosmic Li, Be and B nuclei with the DAMPE space mission

The measurement of secondary cosmic ray nuclei such as lithium, beryllium and boron can offer insights into the mechanisms of cosmic ray propagation in our Galaxy. For example, the flux ratio of secondary over primary nuclei is a direct handle on the energy dependence of the galactic diffusion coefficient. Moreover, a comparison of the observed spectral features between secondary and primary cosmic rays makes it possible to probe the origin of these structures, disentangling between the hypot...

The line of colour. Intersections of race and space in Lisbon.

The urgency of coping with the uneasiness of tackling race in Europe motivates this dissertation to explore how the racial and the urban connect. Scholars warn that a new era of conflicts played on racial lines is opening up hitting mainly the cities. As a result, race and the city are of increasing concern in public discourses. However, outside the US, the effects of race are often neglected or even denied. Although difficult to grasp, the race process has material and tangible effects that ...

Essay on local violence

As in the case of other place-specific social phenomena, violence makes no exceptions when it comes to the investigation of common patterns, including both its origins and outcomes. One immediate consequence of this fundamental premise is that finding unanimous consensus within the academic literature can be a challenging task, with only a few exceptions when it comes to overarching theoretical frameworks. This thesis represents a dedicated effort to enhance our understanding of violence thro...

Fairness in Influence Maximization

Online social networks such as Facebook, LinkedIn, and Twitter are an inseparable part of our life. They help us to interact with other people at little cost (and) easily. These networks play an essential role in spreading information, ideas, and knowledge among users. This results in affecting or changing users' opinions about certain topics. When a user of a social network receives a piece of information, she may share it with her friends, and her friends can share it with her friends’ frie...

Productive Factors (Mis)Allocation across regions and cities

Questa tesi dottorale tratta la distribuzione spaziale dei fattori produttivi, producendo nuove evidenze circa il ruolo che i costi legati alla distanza – le cosiddette frizioni spaziali – hanno nell’influenzare tale distribuzione ed il grado di efficienza che essa esprime. La tesi è motivata dalla rilevanza che le modalità con cui i fattori produttivi si distribuiscono nello spazio hanno tanto in termini di politiche pubbliche che di ricerca. A causa della riduzione dei costi commerciali e...

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