Cette thèse a consisté en la fabrication d’électrodes de charbon actif frittées par SPS destinées aux supercondensateurs à double couche électrochimique. L’influence des paramètres de frittage (température, pression, durée du palier isotherme et vitesses de chauffe et de refroidissement) sur les propriétés structurales et microstructurales des pastilles de charbon actif a été évaluée par diffraction des rayons X, microscopie électronique à balayage et en transmission, spectrométrie de photoélectrons X, mesures de surface spécifique et de volume microporeux et détermination des propriétés mécaniques. Les performances électrochimiques des pastilles de charbon actif frittées sélectionnées pour leurs bonnes propriétés de volume microporeux, de résistance mécanique à l’électrolyte et de masse volumique élevée ont été déterminées par mesures galvanostatiques et de spectrométrie d’impédance. Un gain en capacité volumique de 31% a été obtenu pour un supercondensateur composé d’électrodes de charbon actif pur de 200 μm d’épaisseur frittées à 1100°C – 50 MPa par rapport à un supercondensateur composé d’électrodes de production de Blue Solutions. Cependant sa résistance série est deux fois supérieure à celle d’un supercondensateur de production de volume identique. Des résultats prometteurs de frittage multi-pastilles, possédant des propriétés microstructurales proches, indiquent une voie possible d’industrialisation du procédé SPS pour la fabrication d’électrodes frittées de charbon actif destinées aux supercondensateurs. / This thesis has consisted in the manufacturing of activated carbon electrodes sintered by SPS for Electric Double-Layer Capacitors (EDLCs). The influence of sintering parameters (temperature, pressure, isothermal dwell duration, heating and cooling rates) on structural and microstructural properties of sintered activated carbon pellets has been evaluated by X-ray diffraction, scanning and transmission electron microscopy, X-ray photoelectron spectrometry, specific area and microporous volume measurements and determination of mechanical properties. The electrochemical performances of sintered activated carbon pellets selected for their good properties in terms of microporous volume, mechanical resistance in the electrolyte and high density were determined by galvanostatic and impedance spectrometry measurements. A 31% increase of the volumetric capacity was obtained for a supercapacitor composed of 200 μm thick electrodes of pure activated carbon sintered at 1100°C – 50 MPa, relative to a supercapacitor composed of industrial electrodes from Blue Solutions company. However, its serial resistance is twice larger than that of an industrial of identical volume. Promising results of multi-pellet sintering, possessing close microstructural properties, indicate a possible way of industrialization of SPS process for the manufacturing of sintered activated carbon electrodes for supercapacitors.

This thesis gives a comprehensive characterization of lightweight non-oxide ceramic materials for ballistic applications, an overview of production technologies and processing of boron carbide B4C and its ceramic-based composites. A framework for evaluating the ballistic resistance of the material based on mechanical properties is shown there. It can be used in experiments without normalized equipment. The experiments including B4C + Si, B4C + Ti composites, and application of Spark plasma sintering (SPS) were designed according to outputs from the theoretical part. The volume fractions of Si, Ti dopants were optimized based on ongoing chemical reactions during sintering. The obtained samples were subjects of mechanical testing which results were compared to identify the ideal ratio of matrix and reinforcement. As the best suited material for ballistic protection, B4C + 1,0 obj. % reaches these values of parameters; hardness = 3502 ± 122 HV1; fracture toughness KIC = 2,97 ± 0,03 MPam^0,5.

Most exogenous developmental models have not provided satisfactory results in indigenous settings. The resulting development policies have contributed to the expropriation of indigenous territories and to the indiscriminate exploitation of natural resources, that have led to a generalized worsening of indigenous peoples’ living conditions. The expression “development aggression” has been coined to describe the violation of indigenous individual and collective rights during development processes that have been imposed top-down rather than shared and implemented with the communities involved. Against this background, several studies have pinpointed the role of indigenous entrepreneurship in sustaining endogenous development processes. Due to the low number of empirical studies supporting this proposition, this research aims at contributing to the debate, claiming that community enterprises are an effective vehicle for an indigenous self- determined process of development. More specifically, these grassroots entrepreneurial initiatives appear able to sustain an indigenous conception of well-being that has recently entered the Latin American debate on development. This conception, named buen vivir, emphasizes the importance of indigenous culture, the natural environment, and collective well-being. Based on a multidisciplinary approach that draws on entrepreneur- ship, economic sociology, anthropology, and development studies, the re- search combines theoretical and empirical approaches. An ethnographic study has been carried out in the first half of 2012 and has investigated sixteen self-managed community enterprises that have been founded by indigenous Mayan communities in the Mexican state of Chiapas. The fieldwork has been based on in-depth semi-structured interviews, as well as direct observation and analysis of secondary sources. The focus is on identifying the enabling factors that have supported the emergence of these enterprises and the impact they have had on improving indigenous peoples’ well-being. The main findings pinpoint the existence of some enabling factors for the emergence of community enterprises in the indigenous context, that have to be found in the indigenous cultural resources on which they are based, in the linkages they hold with social movements, and in the situation of social and economic stress of the context in which they are embedded. The research has also highlighted that in the context ana- lyzed community enterprises maintain some specific characteristics: they have a civic origin, thus they are not externally driven; they pursue a plurality of goals, which are not only social and economic, but also political, cultural and environmental; they have a participatory governance, based on equality among members and on democratic principles; and an entrepreneurial dimension that is explicitly aimed at pursuing social objectives through the continuous production of goods or services. These four characteristics explain the contribution that community enterprises can offer in supporting alternative approaches to development, where local communities are actors of their own development processes.

In this thesis I investigate the impact of donor organizations on NGOs’ efforts to foster local community participation in environmental projects, by analyzing how conditions on project funding affect a sample of South African NGOs. Numerous NGOs take environmental justice as a key tenet of their work. Yet, promoting environmental justice is not an easy task to perform. Aside from cultural, political and social contingencies peculiar to specific contexts, there are external constraints that can help or hinder NGOs’ efforts, among which resource-dependency dynamics stand out as particularly relevant. In fact, donors hold power over NGOs, who must stick to specific conditions to secure their support. My aim is to understand what conditions and what type of donors facilitate or hinder community participation —a basic condition for achieving environmental justice— in environmental projects, where hindrances are exemplified by the presence of NGOization dynamics. I analyze donors’ guiding principles, eligibility criteria and monitoring and evaluation standards, delving into the provisions of five different funders that financially support local environmental projects in South Africa, classified according to their core values and organizational settings. Data are collected, coded, and analyzed with the help of NVIVO through a content analysis of calls for grants, project proposals, project reports, and semi-structured interviews to donors and NGO professionals. In this study, I argue that donor organizations can facilitate community participation and avoid NGOization dynamics by acknowledging the existence of unequal power relations between them and the NGOs they fund and by taking measures to respond to NGOs demands. This study highlights the importance of long-term engagement and a relationship based on trust between donors and NGOs as key to creating alternative funding models that help secure the goals that local communities define. Moreover, this study also claims that donors’ upward accountability has a weight in determining conditions on funds and eligibility criteria, and that many of the donors’ virtuous practices originate from their independence from upward accountability measures.

Our research aims to examine how the innovative conception of "political science", developed by Jean Bodin (1529/30-1596) in his Methodus ad facilem historiarum cognitionem (1566; 1572), falls within the scope of a humanist program which restores legal science in the name of scientia civilis. We therefore propose to investigate the line of thoughts which regard the scientia civilis in the works of two of his predecessors, Guillaume Budé and François Connan, who develop this "science" for the sake of magistrates-judges of the Parlements by devising a "method" which intends to unify legal theory with practical knowledge. Their considerations lead them to establish a new paradigm of jusnaturalism and to re-establish, in modern times, the very notion of law on the basis of right reason, id est, on the basis of a community of laws dominated only by reason: civitas universa. We bring light to the fact that, when this community is identified with the international society of his time, supposedly ruled by the ius gentium which incarnates reason, Bodin bestows upon his scientia civilis a political character. If the jusnaturalist paradigm allows him to assume the transition from a barbarous state to a human society, it is his famous theory of sovereignty (summum imperium) that, by defining the coercive power delegated to the magistrates of Parlements, allows them to realize this transition. We propose that his "method" of reading the history enables him to materialize the political science, which determines, beyond the limits of legal science, the role the government plays in realizing the human society, or in other words, the new civitas universa, governed by the ius gentium.

This PhD dissertation is a collection of four essays focusing on the demand and supply of small business finance in Kenya. The studies are the result of primary research conducted over three years with both demand-side players, more specifically micro and small-scale entrepreneurs operating in a low-income area in Nairobi. And the main suppliers of small businesses finance in Kenya - commercial banks - which provided data on the size, characteristics and evolution of their SME finance portfolio between 2009 and 2013. Since commercial banks are not the only players in the provision of finance to small firms, the dissertation studies the entire financial landscape of both formal and informal financial providers, including institutions such as microfinance institutions, savings groups and moneylenders among others. The dissertation is divided in two parts: the first half of the dissertation analyses the determinants, effects and challenges of access to formal and informal finance by small enterprises in Nairobi (Essays 1 and 2). These two essays use primary data collected through a survey questionnaire with 344 micro and small enterprises in a low income neighbourhood in Nairobi. The analysis describes the financial landscapes in which businesses operate and the effects of access to credit on firm performance (e.g. investments, profitability and employment growth.). The second half of the dissertation analyses the supply-side, more specifically the relation between formal financial sector development and economic growth (Essay 3) and the characteristics and development of bank financing to SMEs (small and medium enterprises) in Kenya (Essay 4). Essay 3 relies on secondary time-series data taken from the World Bank databases, whereas Essay 4 uses original survey data administered to commercial banks in Kenya in two survey rounds in 2012 and 2014. Each essay in this dissertation is a standalone study with its own literature survey, research questions, data and methodological approach. The main findings of the demand-side chapters is that informality has significant effects on access (or exclusion) to bank finance, but is less relevant when we investigate informal financial instruments such as self-help groups and family/friend loans. Essay 2 of the dissertation shows that different types of loans have different effects on the performance of businesses, and that loans from commercial banks seem to incentivize investments and employment creation more than other types of loans. The supply-side chapters on the other hand show that there is a long-term association between financial sector development in Kenya and economic growth, and that there is a reciprocal relation of causality over the long-run. Finally, Essay 4 shows that bank financing to SMEs has grown steadily over the last few years and that banks are increasingly exposed to small businesses in their lending portfolio. However, the financial products to SMEs tend to be unsophisticated and concentrated in few sectors.

Every human being is familiar to the experience of reminiscence: recalling and revisiting our past memories. We reminisce to create our identities. We reminisce to maintain our relationships. We reminisce to review our lives. And we also reminisce together. This dissertation develops around the topic of how IT stimulates reminiscence, motivated by its proven benefits in peopleâ s well-being and its prevalence across all stages of life. The focus is set on older adults, with the overall goal of fostering intergenerational social interactions (that is, interactions between older adults and younger generations). This thesis is motivated by the current interest on active ageing as an emergent way of life, with better and more opportunities for health, participation and security. As the world ageing population continues to increase and the average life expectancy of people increasing every year, there is a growing need for understanding the ageing phenomena, and particularly, for designing human centered information technologies (IT) that enhance opportunities of social participation as people age. Within this scenario, this dissertation addresses the following research questions using a participatory approach to research and design: (i) what is the role of IT in enabling a more happy and active ageing?; (ii) in doing so, how can IT stimulate intergenerational social interactions?, and (iii) can IT-supported social reminiscence facilitate these interactions and make of them an enjoyable experience?. To answer these questions, we leverage upon a participatory action research approach to gain an understanding of the topic, moving later to the participatory design of IT for social reminiscence and finally, evaluating how IT supports the practice of social reminiscence in a face-to-face intergenerational context. The contributions of this dissertation can be summarized as follows: - Knowledge: an understanding of what role IT can play in supporting, stimulating and accompanying active ageing and social interactions through the practice of reminiscence. - Model: a conceptual model of the different stages of IT-supported social reminiscence sessions, and an extended model of the design spaces for intergenerational engagement. - System: an exemplary socio-technical system that fits the aforementioned roles, including a knowledge base and algorithms to support contextual stimulation of reminiscence, using multimedia resources that are publicly available on the web. - Evaluation: quantitative and qualitative results obtained from observing the use of our system in a real intergenerational context.

Through a cyberethnographic informed approach applied to a mature Free and Open Source Software video game collective this research addressed a central issue in contemporary information age: the increasing place taken by users in creating and maintaining innovative public goods thanks to the distributed carrying capacity of the Internet. The empirical work is based on an ethnographic immersion in the field and on interviews and it is theoretically informed by Actor-Network Theory and integrated with insights coming from Action Nets.

Though causing water and soil contamination and serious threats to the natural environment and human well-being, waste crime has not been considered a serious crime in any society. Moreover, while the problem of waste crime has often been portrayed as the result of organized crime’s involvement in the legitimate economy, scant attention has been given to the role of legitimate economic operators in illegal waste diversion activities. Seeking profitability and cost reduction, respected companies rationally opt for managing waste illegally in the course of everyday business activities when faced with crime opportunities. Existing research has suggested that legislative loopholes or complex and ambiguous law rules can provide crime opportunities, which profit-driven market players may choose to exploit at the expense of the environment. These studies so far have been hampered by the lack of an empirical analysis of whether existing laws may facilitate or encourage illegal waste diversion activities. The present dissertation sought to examine the problem, which is mainly legal in nature, from a criminological perspective. It examined waste crime committed by legitimate economic operators, focusing specifically on the crime prosecuted in Italy under the heading of illegal traffic of waste. The purpose of such crime-specific focus was to qualitatively explore how this specific type of waste crime is committed and further identify crime opportunities provided by the legal environment in which waste management activities regularly take place. More specifically, the research attempted to determine whether legislative shortcomings within the legislation that regulates the waste management sector may bestow opportunities to lawbreaking. The analysis of the data sources in the study provided reliable evidence about the involvement of legitimate market players in illegal waste diversion activities. The research not only revealed the process through which illegal waste traffic is perpetrated by legitimate market players, but also uncovered potential crime opportunities provided by the legislation that governs the waste management sector. Furthermore, the findings indicated that shortcomings within administrative controls play a substantial role in facilitating and encouraging illegal waste diversion activities. The results form the basis for inductive inferences about the existence of a relationship between crime opportunities provided by the law and administrative controls, and economic operators’ involvement in waste crime.

This research investigates why people acquire dual citizenship. It focuses on the acquisition of dual citizenship through residency, with a processual lens and under conditions of “ordinariness” to tackle aspects that are usually overlooked. It builds on the differentiated access to dual citizenship granted to Peruvian migrants by the Italian and Spanish citizenship regimes. The 79 Peruvian migrants included in the study are either prospective dual citizens or actual dual citizens. The research builds on qualitative methods ranging from participant observation to in-depth semi-structured interviews. It investigates the motivations, expectations and contingences that bring migrants to the status acquisition. The analysis distinguishes between early and postponed acquisitions to highlight how practices of convenience and everyday forms of substantive commitment can coexist under the same national umbrella. Moreover it suggests that the availability and accessibility of the dual status cannot be conflated with a supposed desirability. Although nation-states design their citizenship and immigration regimes according to normative stances that should shape their ideal citizenry, individuals qua migrants manage to forge their own way into the host community while formally abiding the law. Thus, migrants’ pathways across statuses are the result of structural constraints as much as personal preferences and deliberate positioning vis-à-vis nation-states. The study shows how people navigate the laws through both legal and semi-legal means; how they cultivate constellations of belonging that do not necessarily match formal memberships; and how they invest citizenship with multiple meanings that can converge, collide, or simply bypass the state-led rhetoric on national membership.