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To date, critical examinations of smart cities have largely ignored their temporality. In this article, I consider smart cities from a spatiotemporal perspective, arguing that they produce a new timescape and constitute space-time machines. The first half of the article examines spatiotemporal relations and rhythms, exploring how smart cities are the products of and contribute to space-time compression, create new urban polyrhythms, alter the practices of scheduling, and change the pace and tempos of everyday activities. The second half of the article details how smart cities shape the nature of temporal modalities, considering how they reframe and utilize the relationship among the past, present, and future. The analysis draws from a set of forty-three interviews conducted in Dublin, Ireland, and highlights that much of the power of smart urbanism is derived from how it produces a new timescape, rather than simply reconfiguring spatial relations.

Despite repeated calls to action, proposals for urban conservation are often met with surprise or scepticism. There remains a pervasive narrative in policy, practice, and the public psyche that urban environments, although useful for engaging people with nature or providing ecosystem services, are of little conservation value. We argue that the tendency to overlook the conservation value of urban environments stems from misconceptions about the ability of native species to persist within cities and towns and that this, in turn, hinders effective conservation action. However, recent scientific evidence shows that these assumptions do not always hold. Although it is generally true that increasing the size, quality, and connectivity of habitat patches will improve the probability that a species can persist, the inverse is not that small, degraded, or fragmented habitats found in urban environments are worthless. In light of these findings we propose updated messages that guide and inspire researchers, practitioners, and decision makers to undertake conservation action in urban environments: consider small spaces, recognize unconventional habitats, test creative solutions, and use science to minimize the impacts of future urban development. A pesar de las repetidas llamadas a actuar, las propuestas para la conservación urbana con frecuencia se enfrentan a reacciones de sorpresa o escepticismo. Todavía existe una narrativa penetrante en la política, la práctica y el psique del público que dicta que los ambientes urbanos, aunque sean útiles para comprometer a las personas con la naturaleza o para proporcionar servicios ambientales, tienen poco valor para la conservación. Argumentamos que la tendencia de pasar por alto el valor para la conservación de los ambientes urbanos surge de las ideas erróneas sobre la habilidad que tienen las especies nativas para persistir dentro de ciudades y pueblos y que esto, en cambio, impide la acción efectiva de la conservación. A pesar de esto, la evidencia científica reciente muestra que estas suposiciones no siempre se sostienen. Aunque casi siempre es verdad que incrementar el tamaño, la calidad y la conectividad de los fragmentos de hábitat mejorará la probabilidad de que una especie pueda persistir, lo contrario, que los hábitats fragmentados, degradados y pequeños que se encuentran en los ambientes urbanos son inútiles, no lo es. A la luz de estos hallazgos proponemos mensajes actualizados que guíen e inspiren a los investigadores, practicantes y a los tomadores de decisiones a emprender acciones de conservación en ambientes urbanos: considerar espacios pequeños, reconocer hábitats poco convencionales, probar con soluciones creativas, y utilizar la ciencia para minimizar los impactos de desarrollos urbanos futuros. 尽管人们一再呼吁要采取城市保护行动，然而却常常对相关提案表示诧异或怀疑。在政策制定、实践行 动和公众心理中仍存在ー种普遍的认识，即城市环境虽然有助于人们亲近自然并提供生态系统服务，但其保护价 值微乎其微。我们认为，这种忽视城市环境保护价值的彳顷向来源于对本地物种在城市和乡镇间续存能力的误解， 而这反过来又阻碍了有效的保护行动。然而，最近的科学证据表明这些种种假设并不总是成立。虽然通常情况 下増加生境斑块的大小、提高其质量和连接度可以提高物种续存的可能性，/旦反过来看并不是说退化或碎片化 的小面积生境在城市环境中就毫无价值。鉴于以上发现，我们建议更新这些指导和激励研究者、实践者和决策 者采取城市环境保护行动的信息，应考虑小尺度空间的保护、认识非传统生境、尝试创新性解决方氣并利用科 学知识来减少未来城市发展带来的影晌。

In many countries around the world, smart cities are becoming a reality. These cities contribute to improving citizens’ quality of life by providing services that are normally based on data extracted from wireless sensor networks (WSN) and other elements of the Internet of Things. Additionally, public administration uses these smart city data to increase its efficiency, to reduce costs and to provide additional services. However, the information received at smart city data centers is not always accurate, because WSNs are sometimes prone to error and are exposed to physical and computer attacks. In this article, we use real data from the smart city of Barcelona to simulate WSNs and implement typical attacks. Then, we compare frequently used anomaly detection techniques to disclose these attacks. We evaluate the algorithms under different requirements on the available network status information. As a result of this study, we conclude that one-class Support Vector Machines is the most appropriate technique. We achieve a true positive rate at least 56% higher than the rates achieved with the other compared techniques in a scenario with a maximum false positive rate of 5% and a 26% higher in a scenario with a false positive rate of 15%.

In a time of increasing urbanization, the fundamental value of conserving urban biodiversity remains controversial. How much of a fixed budget should be spent on conservation in urban versus nonurban landscapes? The answer should depend on the goals that drive our conservation actions, yet proponents of urban conservation often fail to specify the motivation for protecting urban biodiversity. This is an important shortcoming on several fronts, including a missed opportunity to make a stronger appeal to those who believe conservation biology should focus exclusively on more natural, wilder landscapes. We argue that urban areas do offer an important venue for conservation biology, but that we must become better at choosing and articulating our goals. We explored seven possible motivations for urban biodiversity conservation: preserving local biodiversity, creating stepping stones to nonurban habitat, understanding and facilitating responses to environmental change, conducting environmental education, providing ecosystem services, fulfilling ethical responsibilities, and improving human well-being. To attain all these goals, challenges must be faced that are common to the urban environment, such as localized pollution, disruption of ecosystem structure, and limited availability of land. There are, however, also challenges specific only to particular goals, meaning that different goals will require different approaches and actions. This highlights the importance of specifying the motivations behind urban biodiversity conservation. If the goals are unknown, progress cannot be assessed.

The 'mega-cities' of the developing world are home to over 10 million people each and even smaller cities are experiencing unprecedented population surges. The problems surrounding this influx of people - slums, poverty, unemployment and lack of governance - have been well-documented. This book provides ways on how to deal with these challenges.

In Jerusalem, Israeli and Jordanian militias patrolled a fortified, impassable Green Line from 1948 until 1967. In Nicosia, two walls and a buffer zone have segregated Turkish and Greek Cypriots since 1963. In Belfast, \"peaceline\" barricades have separated working-class Catholics and Protestants since 1969. In Beirut, civil war from 1974 until 1990 turned a cosmopolitan city into a lethal patchwork of ethnic enclaves. In Mostar, the Croatian and Bosniak communities have occupied two autonomous sectors since 1993. These cities were not destined for partition by their social or political histories. They were partitioned by politicians, citizens, and engineers according to limited information, short-range plans, and often dubious motives. How did it happen? How can it be avoided? Divided Citiesexplores the logic of violent urban partition along ethnic lines-when it occurs, who supports it, what it costs, and why seemingly healthy cities succumb to it. Planning and conservation experts Jon Calame and Esther Charlesworth offer a warning beacon to a growing class of cities torn apart by ethnic rivals. Field-based investigations in Beirut, Belfast, Jerusalem, Mostar, and Nicosia are coupled with scholarly research to illuminate the history of urban dividing lines, the social impacts of physical partition, and the assorted professional responses to \"self-imposed apartheid.\" Through interviews with people on both sides of a divide-residents, politicians, taxi drivers, built-environment professionals, cultural critics, and journalists-they compare the evolution of each urban partition along with its social impacts. The patterns that emerge support an assertion that division is a gradual, predictable, and avoidable occurrence that ultimately impedes intercommunal cooperation. With the voices of divided-city residents, updated partition maps, and previously unpublished photographs,Divided Citiesilluminates the enormous costs of physical segregation.

Despite growing interest in urban vulnerability to climatic change, there is no systematic understanding of why some urban centers have greater social vulnerability than others. In this article, we ask whether the social vulnerability of Amazonian cities to floods and droughts is linked to differences in their spatial accessibility. To assess the accessibility of 310 urban centers, we developed a travel network and derived measures of connectivity and geographical remoteness. We found that 914,654 people live in roadless urban centers (n = 68) located up to 2,820 km from their state capital. We then tested whether accessibility measures explained interurban differences in quantitative measures of social sensitivity, adaptive capacity, and an overlooked risk area, food system sensitivity. Accessibility explained marked variation in indicators of each of these dimensions and, hence, for the first time, we show an underlying spatial basis for social vulnerability. For instance, floods pose a greater disease risk in less accessible urban centers because inadequate sanitation in these places exposes inhabitants to environmental pollution and contaminated water, exacerbated by poverty and governance failures. Exploring the root causes of these spatial inequalities, we show how remote and roadless cities in Amazonia have been historically marginalized and their citizens exposed to structural violence and economic disadvantage. Paradoxically, we found that places with the highest social vulnerability have the greatest natural and cultural assets (rainforest, indigenous peoples, and protected areas). We conclude that increasing accessibility through road building would be maladaptive, exposing marginalized people to further harm and exacerbating climatic change by driving deforestation.