A systematic review of machine-learning solutions in anaerobic digestion

The use of machine learning (ML) in anaerobic digestion (AD) is growing in popularity and improves the interpretation of complex system parameters for better operation and optimisation. This systematic literature review aims to explore how ML is currently employed in AD, with particular attention to the challenges of implementation and the benefits of integrating ML techniques. While both lab and industry-scale datasets have been used for model training, challenges arise from varied system designs and the different monitoring equipment used. Traditional machine-learning techniques, predominantly artificial neural networks (ANN), are the most commonly used but face difficulties in scalability and interpretability. Specifically, models trained on lab-scale data often struggle to generalize to full-scale, real-world operations due to the complexity and variability in bacterial communities and system operations. In practical scenarios, machine learning can be employed in real-time operations for predictive modelling, ensuring system stability is maintained, resulting in improved efficiency of both biogas production and waste treatment processes. Through reviewing the ML techniques employed in wider applied domains, potential future research opportunities in addressing these challenges have been identified

The effects of verbal information on children's fear beliefs about social situations

Two experiments explored the role of verbal information in changing children’s fearrelated beliefs about social situations. In Experiment 1, 118 6- to 8- and 12- to 13-year-olds heard positive, negative, or no information about individuals’ experiences of three social situations. Fear beliefs regarding each situation were assessed before and after this manipulation. Verbal information had no significant influence on children’s fear beliefs. In Experiment 2, the same paradigm was used with 80 12- to 13-year-olds, but the information took the form of multiple attitude statements about the situations expressed by groups of peers, older children, or adults. An affective priming task of implicit attitudes was used to complement the explicit questions about fear beliefs. Negative information influenced both explicit and implicit fear beliefs. The source of information and the child’s own social anxiety did not moderate these effects. Implications for our understanding of the socialisation of childhood fears are discussed

Urban Struggles with Financialization

The 2008 financial crisis and its impacts on the urban landscape contributed to a proliferation of research on the financialization of urban space, particularly of housing. Today, financialization is a mainstream focus of study within geography. But while scholars have responded to earlier calls to center space and place in their research, it has only been quite recently that geographers have taken up efforts to politicize and contest the financialization of urban space. This essay assesses the emerging body of literature on urban struggles with financialization. It first draws on historical materialist perspectives to situate financialization within urban contexts, showing why there is a particular relationship between this process and urban space, and how moments of crisis reveal tensions in this relationship. Reviewing literature focused on places exposed to the most systemic housing-financial crises in 2008, the essay then explores how residents, activists, and movements have grappled with financialization. It argues that a key aspect of such struggles is the ability to make their presence felt within chains of financial intermediaries or the corporate headquarters of foreign investors. The essay also highlights how moments of crisis open space for more radical tactics that disrupt the dominant production of space and emphasize the social value of housing. It suggests ways to fruitfully expand geographic inquiry into urban struggles with financialization through focusing on the formation of political subjectivities and engaging geographies beyond the global north

Staging equality in Greek squares: hybrid spaces of political subjectification

This article stages a dialogue between Jacques Rancière's political writings and the squares movement in Greece. From May to July 2011, a heterogeneous multitude of protesters reclaimed the squares of the country from their allocation in the police order and articulated a multiplicity of divergent discursive, organizational and spatial repertoires. This was an urban political event that reasserted the importance of urban spaces in expressing political dissent and experimented with new ways of being and acting in common. This article draws on Rancière's conceptualization of politics to read the squares movement as an opening of spaces of political subjectification. At the same time, through a close ethnography of the squares, it highlights the tensions that marked this process and focuses on two of these: the coexistence of nationalist and equalibertarian discursive and performative repertoires and the co-implication of horizontal and vertical organizational practices. The article builds on this analysis to argue that the squares movement opened hybrid spaces of political subjectification and to explore some of the tensions in Rancière's political writings. This reading, in turn, informs a discussion of the legacies of the squares movement

Subjectification in Times of Indebtedness and Neoliberal/Austerity Urbanism

© 2016 The Author. Antipode © 2016 Antipode Foundation Ltd. How can we analyse the (re)emergence of squatting in relation to the current housing crisis in Italy? Centred on the case of Rome, the paper theorizes this return as resulting from processes of subjectification in the housing sector linked to the raising of indebtedness as a main dispositif of capitalism under neoliberal/austerity urbanism agendas. The political economy-oriented literature on neoliberal/austerity urbanism is bridged with the post-Marxist approach of Maurizio Lazzarato. Debt is seen as the archetype of social relations, shaping and controlling subjectivities, making the “work on yourself” essential to the reproduction of (indebted) society. However, given the circular nature of power, indebtedness can be generative of new processes of subjectification aimed at subverting the same power relation. In this sense, the paper operationalizes the conceptualization of Foucauldian subjectification recently proposed by Judith Revel, emphasizing how subjectification always results from (1) an action/gesture and (2) a consequent deconstruction of the identity

Spaces of the Expelled as Spaces of the Urban Commons? Analysing the Re-emergence of Squatting Initiatives in Rome

© 2017 Urban Research Publications Limited Asserting the need to acknowledge the role of the current crisis and austerity politics in fostering the re-emergence of squatting initiatives in Rome, this article brings together the literature on squatting as an urban social movement, notably Martínez López's holistic approach, with a political economy perspective analysing the current stage of ‘late neoliberalism’. In so doing, I use the conceptualization of ‘expulsions’ developed by Sassen to show how emerging squatting initiatives in Rome represent the ‘spaces of the expelled’. Focusing on the case of Communia in San Lorenzo neighbourhood, the article shows how Martínez López's approach is able to account for the rapid success and support enjoyed by Communia, going as it does beyond the ‘single-issue’ perspective that has dominated much of the squatting literature. Indeed, the main claims addressed by Communia activists concern a plurality of issues grouped around the concept of urban commons, as both a practice and a goal. Methodologically, the article is the result of 18 months of fieldwork based on an activist/participatory action research (PAR) approach, comprising participant observation/observant participation, in-depth interviews and questionnaires

Contesting the financialization of urban space: Community organizations and the struggle to preserve affordable rental housing in New York City

As cities have become both site and object of capital accumulation in a neoliberal political economy, the challenges to community practice aimed at creating, preserving, and improving affordable housing and neighborhoods have grown. Financial markets and actors are increasingly central to the workings of capitalism, transforming the meaning and significance of mortgage capital in local communities and redrawing the relationship between housing and urban inequality. This article addresses the integration of housing and financial markets through the case of "predatory equity," a wave of aggressive private equity investment in New York City's affordable rental sector during the mid-2000s real estate boom. I consider the potential for community organizations to develop innovative, effective, and progressive practices to contest the impact of predatory equity on affordable housing. Highlighting how organizations employed discursive and empirical tactics as well as tactics that reworked the sites, spaces, and structures of finance, this research speaks to the political possibility of contemporary community practice

The Tunisian revolution : neoliberalism, urban contentious politics and the right to the city

This article engages in the debate on urban contentious politics by returning to the Tunisian revolution. In the article, I chart movements provoked by neoliberal restructurings, and show how these ultimately came together to form a mass movement demanding radical political change. I first describe the socio-spatial roots of the Tunisian revolution to understand its dynamics. Based on the chronology of the unfolding events I sketch the classes, social groups and movements that coalesced against authoritarian rule in early 2011. Although the Tunisian revolution started in rural environments, I focus more specifically on the role of urban social movements in the uprising to link questions of urbanism to what were clearly national revolts. Secondly, I outline the scope of neoliberal reforms in Tunisia by looking at the impact of these reforms to chart the resulting emergence of contentious politics in response to the increasing violence that characterized all levels of economic life during this period. I also consider the resulting uneven development and the changing relations between the state and the different social classes. This enables me to reflect on the politicization of the city with the aim of opening up new opportunities for engaging with a more comparative and cosmopolitan theory about cities around the world