Street vending has supplied the inhabitants of Rio de Janeiro with basic goods for several centuries. Once the province of African slaves and free blacks, street commerce became a site of expanded ...(mostly European) immigrant participation and shifting state regulations during the transition from enslaved to free labor and into the early post-abolition period. Street Occupations investigates how street vendors and state authorities negotiated this transition, during which vendors sought greater freedom to engage in commerce and authorities imposed new regulations in the name of modernity and progress. Examining ganhador (street worker) licenses, newspaper reports, and detention and court records, and considering the emergence of a protective association for vendors, Patricia Acerbi reveals that street sellers were not marginal urban dwellers in Rio but active participants in a debate over citizenship. In their struggles to sell freely throughout the Brazilian capital, vendors asserted their citizenship as urban participants with rights to the city and to the freedom of commerce. In tracing how vendors resisted efforts to police and repress their activities, Acerbi demonstrates the persistence of street commerce and vendors’ tireless activity in the city, which the law eventually accommodated through municipal street commerce regulation passed in 1924. A focused history of a crucial era of transition in Brazil, Street Occupations offers important new perspectives on patron-client relations, slavery and abolition, policing, the use of public space, the practice of free labor, the meaning of citizenship, and the formality and informality of work.
Every day Roman urbanites took to the street for myriad tasks, from hawking vegetables and worshipping local deities to simply loitering and socializing. Hartnett takes readers into this thicket of ...activity as he repopulates Roman streets with their full range of sensations, participants, and events that stretched far beyond simple movement. As everyone from slave to senator met in this communal space, city dwellers found unparalleled opportunities for self-aggrandizing display and the negotiation of social and political tensions. Hartnett charts how Romans preened and paraded in the street, and how they exploited the street's collective space to lob insults and respond to personal rebukes. Combining textual evidence, comparative historical material, and contemporary urban theory with architectural and art historical analysis, The Roman Street offers a social and cultural history of urban spaces that restores them to their rightful place as primary venues for social performance in the ancient world.
Cities need to build on their resilience to deal with the combined effects of urbanization, changing geopolitical contexts, and climate change. The physical form of cities has significant ...implications for their capacity to deal with adverse events and changing conditions. This paper focuses on streets as major constituent elements of urban form. It offers a review of the theoretical discussions and empirical evidence on how design and configuration of urban streets and street networks can contribute to/detract from urban resilience. For the purpose of this study, measures related to urban streets are divided into two broad categories: network topology and design and orientation. Network topology is used to represent urban street network as a combination of nodes and links. Relationships between urban resilience and different centrality and connectivity measures related to network topology are discussed. The design and orientation category explores the possible effects of street width, street edges, street canyon geometry, and street layout and orientation on resilience of cities. It is discussed that all topology and design measures have implications for urban resilience. Appropriate physical form of urban streets can contribute to urban resilience by, among other things, ameliorating urban microclimate, reducing energy consumption and its associated Greenhouse Gas (GHG) emissions, enhancing social capital, improving community health and well-being, and facilitating rapid and effective emergency response in the aftermath of disasters. Overall, results provide insights about physical properties that are required to design resilient streets and street networks.
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•I review evidence on the association between the form of streets and resilience.•I focus on measures related to network topology and design and orientation.•Form of streets and street networks has significant implications for urban resilience.•I provide recommendations for improving resilience of streets and street networks.•I highlight major gaps and future research directions.
Streets are an integral part of every city on Earth. They channel the people, vehicles, and materials that help make urban life what it is. They are conduits for the oft-taken-for-granted ...infrastructures that carry fresh water, energy, and information, and that remove excess stormwater and waste. The very air that we breathe—fresh or foul—flows through our street canyons. That streets are the arteries of the city is, indeed, an apt metaphor. But city streets also function as a front yard, linear ecosystem, market, performance stage, and civic forum, among other duties. In their various forms, streets are places of interaction and exchange, from the everyday to the extraordinary. As the editors affirm, the more we scrutinize, share, and activate sustainable approaches to streets, the greater the likelihood that our streets will help sustain life in cities and, by extension, the planet. While diverse in subject, the papers in this volume are unified in seeing the city street as the complex, impactful, and pliable urban phenomenon that it is. Topics range from greenstreets to transit networks to pedestrian safety and walkability. Anyone seeking interdisciplinary perspectives on what makes for good city streets and street networks should find this book of interest.
This book contains twenty-one original papers and one review paper published by internationally recognized experts in the Atmosphere Special Issue "Recent Advances in Urban Ventilation Assessment and ...Flow Modelling", years 2017–2019. The Special Issue includes contributions on recent experimental and modelling works, techniques, and developments mainly tailored to the assessment of urban ventilation on flow and pollutant dispersion in cities. The study of ventilation is of critical importance, as it addresses the capacity with which a built urban structure is capable of replacing the polluted air with ambient fresh air. Here, ventilation is recognized as a transport process that improves local microclimate and air quality and closely relates to the term “breathability”. The efficiency with which street canyon ventilation occurs depends on the complex interaction between the atmospheric boundary layer flow and the local urban morphology.The individual contributions to this Issue are summarized and categorized into four broad topics: (1) outdoor ventilation efficiency and application/development of ventilation indices, (2) relationship between indoor and outdoor ventilation, (3) effects of urban morphology and obstacles to ventilation, and (4) ventilation modelling in realistic urban districts. The results and approaches presented and proposed will be of great interest to experimentalists and modelers, and may constitute a starting point for the improvement of numerical simulations of flow and pollutant dispersion in the urban environment, for the development of simulation tools, and for the implementation of mitigation strategies.
Kids at Work Estrada, Emir
2019, 2019-07-16, Letnik:
7
eBook
How Latinx kids and their undocumented parents struggle in the informal street food economy
Street food markets have become wildly popular in Los Angeles—and behind the scenes, Latinx children ...have been instrumental in making these small informal businesses grow. In Kids at Work, Emir Estrada shines a light on the surprising labor of these young workers, providing the first ethnography on the participation of Latinx children in street vending.
Drawing on dozens of interviews with children and their undocumented parents, as well as three years spent on the streets shadowing families at work, Estrada brings attention to the unique set of hardships Latinx youth experience in this occupation. She also highlights how these hardships can serve to cement family bonds, develop empathy towards parents, encourage hard work, and support children—and their parents—in their efforts to make a living together in the United States. Kids at Work provides a compassionate, up-close portrait of Latinx children, detailing the complexities and nuances of family relations when children help generate income for the household as they peddle the streets of LA alongside their immigrant parents.
View factors for sky, trees, and buildings are three important parameters of the urban outdoor environment that describe the geometrical relationship between different surfaces from the perspective ...of radiative energy transfer. This study develops an approach for accurately estimating sky view factor (SVF), tree view factor (TVF), and building view factor (BVF) of street canyons in the high-density urban environment of Hong Kong using publicly available Google Street View (GSV) images and a deep-learning algorithm for extraction of street features (sky, trees, and buildings). As a result, SVF, TVF, and BVF maps of street canyons are generated. Verification using reference data of hemispheric photography from field surveys in compact high-rise and low-rise areas shows that the GSV-based VF estimates have a satisfying agreement with the reference data (all with R2 > 0.95), suggesting the effectiveness and high accuracy of the developed method. This is the first reported use of hemispheric photography for direct verification in a GSV-based streetscape study. Furthermore, a comparison between GSV-based and 3D-GIS-based SVFs shows that the two SVF estimates are significantly correlated (R2 = 0.40, p < 0.01) and show better agreement in high-density areas. However, the latter overestimates SVF by 0.11 on average, and the differences between them are significantly correlated with street trees (R2 = 0.53): the more street trees, the larger the difference. This suggests that a lack of street trees in a 3D-GIS model of street environments is the dominant factor contributing to the large discrepancies between the two datasets.
•GSV-based view factor estimation method with a deep-learning algorithm is proposed.•Sky, tree, and building view factors of street canyons are accurately quantified.•Hemispheric photography is used for direct verification of view factor estimates.•Comparison analysis of GSV-based and 3D-GIS-based methods is conducted.•The impacts of tree canopy and building density on SVF estimates are investigated.
•10% tree cover in a street lowers mean radiant temperature about 1K.•People significantly appreciate street greenery in esthetic terms.•People are consciously aware of microclimate conditions within ...street canyons.•We recommend to use ample street greenery and large tree cover in street design.
This study focuses on the benefits of street greenery for creating thermally comfortable streetscapes in moderate climates. It reports on investigations on the impact of street greenery on outdoor thermal comfort from a physical and psychological perspective. For this purpose, we examined nine streets with comparable geometric configurations, but varying amount of street greenery (street trees, front gardens) in the city of Utrecht, the Netherlands. Mobile micrometeorological measurements including air temperature (Ta), solar and thermal radiation were performed, enabling the calculation of mean radiant temperature (Tmrt). Additionally, semi-structured interviews with pedestrians about their momentary and long-term perceived thermal comfort and their esthetical appreciation of the green street design were conducted. Measurements showed a clear impact (p=0.0001) of street greenery on thermal comfort through tree shading: 10% tree crown cover within a street canyon lowered street averaged Tmrt about 1K. In contrast, our results did not show an influence of street greenery on street averaged Ta. Interview results indicated that momentary perceived thermal comfort tended to be related to the amount of street greenery. However, the results were not statistically significant. Related to long-term perceived thermal comfort respondents were hardly consciously aware of influences by street greenery. Yet, people significantly (p<0.001) valued the presence of street greenery in esthetic terms. In conclusion, street greenery forms a convenient adaptive strategy to create thermally comfortable and attractive living environments. Our results clearly indicate that both physical and psychological aspects of thermal comfort have to be considered in urban design processes.
Exploring three major hubs of muralist activity in California, where indigenist imagery is prevalent, Walls of Empowerment celebrates an aesthetic that seeks to firmly establish Chicana/o ...sociopolitical identity in U.S. territory. Providing readers with a history and genealogy of key muralists’ productions, Guisela Latorre also showcases new material and original research on works and artists never before examined in print. An art form often associated with male creative endeavors, muralism in fact reflects significant contributions by Chicana artists. Encompassing these and other aspects of contemporary dialogues, including the often tense relationship between graffiti and muralism, Walls of Empowerment is a comprehensive study that, unlike many previous endeavors, does not privilege non-public Latina/o art. In addition, Latorre introduces readers to the role of new media, including performance, sculpture, and digital technology, in shaping the muralist’s “canvas.” Drawing on nearly a decade of fieldwork, this timely endeavor highlights the ways in which California’s Mexican American communities have used images of indigenous peoples to raise awareness of the region’s original citizens. Latorre also casts murals as a radical force for decolonization and liberation, and she provides a stirring description of the decades, particularly the late 1960s through 1980s, that saw California’s rise as the epicenter of mural production. Blending the perspectives of art history and sociology with firsthand accounts drawn from artists’ interviews, Walls of Empowerment represents a crucial turning point in the study of these iconographic artifacts.
Examining street vending as a global, urban, and informalized practice found both in the Global North and Global South, this volume presents contributions from international scholars working in ...cities as diverse as Berlin, Dhaka, New York City, Los Angeles, Calcutta, Rio de Janeiro, and Mexico City. The aim of this global approach is to repudiate the assumption that street vending is usually carried out in the Southern hemisphere and to reveal how it also represents an essential-and constantly growing-economic practice in urban centers of the Global North. Although street vending activities vary due to local specificities, this anthology illustrates how these urban practices can also reveal global ties and developments.
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