From 'digital' to 'smart': upgrading the city

In this paper we seek to reflect on the way in which 'digital cities' later re-emerge as 'smart cities' (both in terms of the approaches and also the actual cities) and what lessons can be learned about the role of ICTs in how they shape urban space. We will focus on looking at how the lack of understanding of the city as a 'place' is often a common factor in the lack of longevity in 'digital city' initiatives and discuss the corresponding implications for the emergence of 'smart cities'. We draw on a study of the city of Bristol, UK in order to look at the variety of initiatives that took Bristol from a 1990's digital city to the current 'smart' projects. We conclude by reflecting on what can be learnt from the lessons of the failed Digital City projects of 1990's and discuss the role that placemaking could play in the development of socially and spatially sustainable smart cities

Planning, temporary urbanism and citizen-led alternative-substitute place-making in the Global South

This paper argues that planning in the Global South needs to be embedded within a more complex and systemic framework based on understanding cities' functions and transformations, at both local and regional levels, whilst advocating for and incorporating informal and temporary dynamics. This is to differentiate between two competing processes: formal planning and citizen-led place-making, here considered as a form of reactive alternative-substitute place-making that occurs when there is no available alternative. The paper calls for a better integration of such impermanent, adaptable, temporary and alternative forms of place-making into the planning process for regional futures

Negotiating polyvocal strategies:re-reading de Certeau through the lens of urban planning in South Africa

The Practice of Everyday Life (de Certeau M (1984) The Practice of Everyday Life. Berkeley, CA: University of California Press) has become a canonical text in urban studies, with de Certeau’s idea of tactics having been widely deployed to understand and theorise the everyday. Tactics of resistance were contrasted with the strategies of the powerful, but the ways in which these strategies are operationalised were left ambiguous by de Certeau and have remained undertheorised since. We address this lacuna through an examination of the planning profession in South Africa as a lieu propre– a strategic territory with considerable power to shape urban environments. Based on a large interview data set examining practitioner attitudes toward the state of the profession in South Africa, this paper argues that the strategies of the powerful are themselves subject to negotiation. We trace connections with de Certeau’s earlier work to critique the idea that strategies are univocal. We do this by examining how the interests of different powerful actors can come into conflict, using the planning profession as an exemplar of how opposing strategies must be mediated in order to secure changes in society

The other side of droughts: wet extremes and topography as buffers of negative drought effects in an Amazonian forest.

There is a consensus about negative impacts of droughts in Amazonia. Yet, extreme wet episodes, which are becoming as severe and frequent as droughts, are overlooked and their impacts remain poorly understood. Moreover, drought reports are mostly based on forests over a deep water table (DWT), which may be particularly sensitive to dry conditions. Based on demographic responses of 30 abundant tree species over the past two decades, in this study we analyzed the impacts of severe droughts but also of concurrent extreme wet periods, and how topographic affiliation (to shallow - SWTs - or deep - DWTs - water tables), together with species functional traits, mediated climate effects on trees. Dry and wet extremes decreased growth and increased tree mortality, but interactions of these climatic anomalies had the highest and most positive impact, mitigating the simple negative effects. Despite being more drought-tolerant, species in DWT forests were more negatively affected than hydraulically vulnerable species in SWT forests. Interaction of wet-dry extremes and SWT depth modulated tree responses to climate, providing buffers to droughts in Amazonia. As extreme wet periods are projected to increase and at least 36% of the Amazon comprises SWT forests, our results highlight the importance of considering these factors in order to improve our knowledge about forest resilience to climate change

Whose Right to the Smart City

This chapter works with Lefebvre’s ‘Right to the City’ (1996b) to understand how a Smart City initiative was being implemented and as a consequence who benefitted. Whilst a model of citizenship is offered in smart cities, the ‘actually existing’ smart city in fact reconfigures models of citizenship in ways that instrumentalise technology and data that can reinforce patterns of exclusion for marginalised groups. Therefore, this chapter aims to understand how citizens participate in smart city projects and whether they can in fact they lead to the exacerbation of existing urban historical, material and social inequalities. The chapter focuses on some of those excluded by smart city projects; the urban poor, street traders and those who live in informal settlements and explores the way in which they access and participate in the city. In the Global South context, India is a key actor in implementing a national level smart city programme, and research was undertaken in the city of Chennai to investigate the way that the India Smart Cities Mission was being planned and implemented and the corresponding implications for marginalized communities. The chapter argues that there is a need to recognize the value of a range of everyday, small-scale ways in which citizens employ technologies and data that meet their needs in a social and spatially embedded context. In this way marginalized people may be empowered to have what Lefebvre describes as ‘the right to the oeuvre, to participation and appropriation’ (1996, p.173) in urban space

An overview of the clinical use of filter paper in the diagnosis of tropical diseases.

Tropical infectious diseases diagnosis and surveillance are often hampered by difficulties of sample collection and transportation. Filter paper potentially provides a useful medium to help overcome such problems. We reviewed the literature on the use of filter paper, focusing on the evaluation of nucleic acid and serological assays for diagnosis of infectious diseases using dried blood spots (DBS) compared with recognized gold standards. We reviewed 296 eligible studies and included 101 studies evaluating DBS and 192 studies on other aspects of filter paper use. We also discuss the use of filter paper with other body fluids and for tropical veterinary medicine. In general, DBS perform with sensitivities and specificities similar or only slightly inferior to gold standard sample types. However, important problems were revealed with the uncritical use of DBS, inappropriate statistical analysis, and lack of standardized methodology. DBS have great potential to empower healthcare workers by making laboratory-based diagnostic tests more readily accessible, but additional and more rigorous research is needed

The global abundance of tree palms

Aim Palms are an iconic, diverse and often abundant component of tropical ecosystems that provide many ecosystem services. Being monocots, tree palms are evolutionarily, morphologically and physiologically distinct from other trees, and these differences have important consequences for ecosystem services (e.g., carbon sequestration and storage) and in terms of responses to climate change. We quantified global patterns of tree palm relative abundance to help improve understanding of tropical forests and reduce uncertainty about these ecosystems under climate change. Location Tropical and subtropical moist forests. Time period Current. Major taxa studied Palms (Arecaceae). Methods We assembled a pantropical dataset of 2,548 forest plots (covering 1,191 ha) and quantified tree palm (i.e., ≥10 cm diameter at breast height) abundance relative to co‐occurring non‐palm trees. We compared the relative abundance of tree palms across biogeographical realms and tested for associations with palaeoclimate stability, current climate, edaphic conditions and metrics of forest structure. Results On average, the relative abundance of tree palms was more than five times larger between Neotropical locations and other biogeographical realms. Tree palms were absent in most locations outside the Neotropics but present in >80% of Neotropical locations. The relative abundance of tree palms was more strongly associated with local conditions (e.g., higher mean annual precipitation, lower soil fertility, shallower water table and lower plot mean wood density) than metrics of long‐term climate stability. Life‐form diversity also influenced the patterns; palm assemblages outside the Neotropics comprise many non‐tree (e.g., climbing) palms. Finally, we show that tree palms can influence estimates of above‐ground biomass, but the magnitude and direction of the effect require additional work. Conclusions Tree palms are not only quintessentially tropical, but they are also overwhelmingly Neotropical. Future work to understand the contributions of tree palms to biomass estimates and carbon cycling will be particularly crucial in Neotropical forests

The global abundance of tree palms

Aim: Palms are an iconic, diverse and often abundant component of tropical ecosystems that provide many ecosystem services. Being monocots, tree palms are evolutionarily, morphologically and physiologically distinct from other trees, and these differences have important consequences for ecosystem services (e.g., carbon sequestration and storage) and in terms of responses to climate change. We quantified global patterns of tree palm relative abundance to help improve understanding of tropical forests and reduce uncertainty about these ecosystems under climate change. Location: Tropical and subtropical moist forests. Time period: Current. Major taxa studied: Palms (Arecaceae). Methods: We assembled a pantropical dataset of 2,548 forest plots (covering 1,191 ha) and quantified tree palm (i.e., ≥10 cm diameter at breast height) abundance relative to co‐occurring non‐palm trees. We compared the relative abundance of tree palms across biogeographical realms and tested for associations with palaeoclimate stability, current climate, edaphic conditions and metrics of forest structure. Results: On average, the relative abundance of tree palms was more than five times larger between Neotropical locations and other biogeographical realms. Tree palms were absent in most locations outside the Neotropics but present in >80% of Neotropical locations. The relative abundance of tree palms was more strongly associated with local conditions (e.g., higher mean annual precipitation, lower soil fertility, shallower water table and lower plot mean wood density) than metrics of long‐term climate stability. Life‐form diversity also influenced the patterns; palm assemblages outside the Neotropics comprise many non‐tree (e.g., climbing) palms. Finally, we show that tree palms can influence estimates of above‐ground biomass, but the magnitude and direction of the effect require additional work. Conclusions: Tree palms are not only quintessentially tropical, but they are also overwhelmingly Neotropical. Future work to understand the contributions of tree palms to biomass estimates and carbon cycling will be particularly crucial in Neotropical forests

Montagem de posicionador de varredura bidimensional automatizada acoplado a espectrometria de fluorescência de raios X

Exportado OPUSMade available in DSpace on 2019-08-14T18:09:39Z (GMT). No. of bitstreams: 1 monografia_silva_leonardo_final_01062012b.pdf: 2302609 bytes, checksum: ddefa9195afc309ed9a7767fa3dcb0b0 (MD5) Previous issue date: 30Este presente trabalho descreve o projeto e a montagem do protótipo de um posicionador de varredura bidimensional automatizada acoplado à espectrometria de fluorescência de raios X. O trabalho tem como objetivo alcançar um equipamento portátil de fácil manuseio e de ampla utilidade na analise de amostras por fluorescência de raios X área da perícia e da pesquisa. A varredura do posicionador bidimensional ocorre por meio de dois motores de passo controlados por um microcontrolador PIC 16F877A, encoder e sensores ópticos. O usuário interage com a mesa XY através de um programa de interface para o sistema operacional Windows, que comunica com o microcontrolador através da porta serial. O sistema de espectrometria de fluorescência incorporado ao posicionador consistiu de um sistema disponibilizado comercialmente pela empresa AMPTEK, onde a fonte primária de excitação da amostra foi uma fonte de 241Am de 59,5 KeV. Testes de resolução e precisão foram realizados no processo de varredura XY e a reprodutibilidade da mesma junto ao kit de espectrometria de fluorescência de raios X. Testes de espectrometria por fluorescência de raios X qualitativa em amostras padrões foram realizados para comprovar a aplicabilidade e versatilidade do projeto. Conclui-se que o protótipo ilustra de forma adequada um possível equipamento portátil para espectrometria de raios X de amostras bidimensionais.This present work describes the design and assembling of a prototypeautomated positioner two-dimensional scanning coupled to X-ray fluorescence spectrometry. The work aims to achieve a portable and easy to use, device of broad utility in the analysis of samples by X-ray fluorescence area of expertise and research. The two-dimensional scanning of the positioner is by means of two stepper motors controlled by a microcontroller PIC 16F877A, encoder and optical sensors. The user interacts with the XY table through an interface program for the Windows operating system, which communicates with the microcontroller through the serial port. The system of Fluorescence Spectroscopy incorporated into the positioner consists of a system commercially available system from the company AMPTEK, where the primary source of excitation of the sample was a source of 241Am of 59.5 KeV emissions. Resolution and accuracy of tests were performed in the XY scanning process and reproducibility of the same kit with the fluorescence spectrometry X-ray. Qualitative tests by X-ray fluorescence spectrometry in samples wereperformed to demonstrate the applicability and versatility of the project. Itfollows that the prototype illustrates a possible adequately to portable device for X-ray spectrometry of two-dimensional