Search Results (195)

Access to safe water and sanitation remains a pressing challenge in Sub-Saharan Africa. Rapid urbanisation, fragile governance, and increasing climate hazards continue to undermine the sustainability of WASH (Water, Sanitation and Hygiene) services. This study examines whether Mozambique’s normative and institutional framework effectively supports sustainable urban WASH service delivery in Beira, the country’s second-largest city. Combining a critical policy review with six semi-structured interviews involving institutional actors and community leaders, the research employs a qualitative, phenomenological design to explore the interaction between national frameworks and local practices. Findings reveal five interrelated dimensions shaping sustainability: governance coordination, infrastructure robustness and maintenance, community participation, climate resilience, and financial viability. Although post-disaster investments and recent policy reforms have led to improvements, significant challenges persist. These include overlapping institutional mandates, underdeveloped preventive maintenance systems, limited recognition and support for community-led initiatives, fragmented climate adaptation efforts, and strong dependence on external funding. The study also reveals how historical legacies, particularly colonial-era governance structures, continue to shape water and sanitation delivery. By integrating policy analysis with local perspectives, the paper contributes to debates on WASH sustainability in African cities, particularly in climate-vulnerable secondary urban centres. It highlights the need for systemic reforms that clarify institutional roles, institutionalise maintenance practices, formalise community engagement, embed nature-based adaptation strategies, and strengthen financial transparency. These changes are essential if Beira, and similar cities across sub-Saharan Africa, are to achieve Sustainable Development Goal 6 under mounting climate pressure. Full article

Geophysical techniques are a core toolkit of modern archeology, thanks to their effectiveness in reconstructing important pieces of evidence for buried ruins, which are relics of the past usage of an inspected site. Some methodological approaches and advancements are proposed for investigating the site of Gela, which was one of the most important western Greek colonies, founded in 689–688 BC on the southern coast of Sicily, Italy. The ancient settlement was developed on a hill, mostly flat on the top, and over its sides. The archeological evidence discovered so far in the acropolis of the city can be attributed to two main architectural typologies: urban blocks and archaic temples. Based on these targets, a geophysical protocol has been tested, utilizing passive seismic, electrical resistivity tomography (ERT), and ground-penetrating radar (GPR) methods. Where the lowest physical contrast was expected among possible archeological remains and burying soil (close to the urban blocks area), the three geophysical techniques have been jointly applied, while an innovative support-to-interpretation approach for GPR datasets is proposed and developed over both kinds of archeological targets. Our experimental outcomes underline the effectiveness (and possible weaknesses) of the two geophysical investigation strategies against various targets producing different signal-to-noise responses, thanks to the synergistic contributions from multi-method and multi-depth approaches. The integrated use of GPR, ERT, and passive seismic methods allowed the reconstruction of complementary information, with each method compensating for the limitations of the others. This combined approach provided a more robust and comprehensive understanding of the subsurface features than would have been achieved through the application of any single technique. Full article

Five centuries ago, the Gibraltar Strait was emerging as the border zone between the core and the periphery of the modern/colonial world-system—a liminal position it continues to occupy today. During this period, Muslims on the southern shore of the Strait resisted the Portuguese and Spanish imperialism which was supported by several other Western European powers as well as the Catholic Papacy. This paper examines the life of Sayyida al-Ḥurra (c. 1491–c. 1552), who played an active role in this resistance, as Governor of the city-state of Tétouan and eventually Queen of Morocco. It summarizes years of transdisciplinary research about her life, which draws upon historical sources and popular narratives, as well as fieldwork in Northern Morocco and Southern Spain. The main finding of this research is that Sayyida al-Ḥurra is an early modern Muslim decolonial exemplar who remains significant today. She embodied an alternate way of being a ruler, a warrior, a woman, and a Muslim. Remembering her life can inspire contemporary decolonial thought, since the very fact of her existence unsettles modern colonial formations of race, ethnicity, governance, war, gender, and religion. Full article

The aging of the Portuguese population is a multifaceted challenge that requires a coordinated and comprehensive response from society. In this context, social service institutions play a fundamental role in providing aid and support to the elderly, ensuring that they can enjoy a dignified and fulfilling life even in the face of the challenges of aging. This research proposes a Balanced Multiple Traveling Salesman Problem based on the Ant Colony Optimization algorithm (ACO-BmTSP) to solve a distribution of meals problem in the municipality of Mogadouro, Portugal. The Multiple Traveling Salesman Problem (mTSP) is an NP-complete problem where m salesmen perform a shortest tour between different cities, visiting each only once. The primary purpose is to minimize the sum of all distance traveled by all salesmen keeping the tours balanced. This paper shows the results of computing obtained for three, four, and five agents with this new approach and their comparison with other approaches like the standard Particle Swarm Optimization and Ant Colony Optimization algorithms. As can be seen, the ACO-BmTSP, in addition to obtaining much more equitable paths, also achieves better results in lower total costs. In conclusion, some benchmark problems were used to evaluate the efficiency of ACO-BmTSP, and the results clearly indicate that this algorithm represents a strong alternative to be considered when the problem size involves fewer than one hundred locations. Full article

This paper investigates the complex interplay between European and pre-Hispanic urban traditions in shaping colonial urbanism across the Americas, with particular emphasis on the transformation of the City of Mexico atop the remnants of the ancient city of Mexico-Tenochtitlan. It contends that the development of the viceregal capital was not merely a straightforward transplantation of the Castilian urban model, but rather a process profoundly influenced—and in many respects enabled—by the sophisticated spatial organisation of the Mexica metropolis. The research examines how the foundational urban layout of Mexico-Tenochtitlan informed the design of the colonial city, highlighting both continuities and divergences between indigenous and Castilian urban frameworks, and analysing the fusion of these traditions in the formation of a novel urban entity. Employing a historical-analytical methodology, this article combines documentary research, comparative analysis of urban configurations from both cultures, and case studies of early colonial settlements. The findings suggest that the City of Mexico evolved into a paradigm of hybrid urbanism, wherein European planning doctrines were adapted and interwoven with enduring indigenous spatial logics and symbolic systems—a synthesis that not only characterised the viceregal capital but also established a precedent for urban development throughout Spanish America. Full article

The growth of microorganisms and lower plants on building walls may respond the central principle of the biophilic design: sustained engagement with nature. As such, bioreceptive concrete has great potential to increase the biodiversity in our cities. In addition, by actively participating in the carbon and nitrogen cycles, biologically active, bioreceptive concrete has the potential to reduce the building’s environmental impact considerably. In the present study, we analyze the biological growth on concrete and critically review the current research approaches in the bioreceptivity evaluation. The uncontrolled and unaesthetic growth of fungal colonies, poor long-term survivability of the laboratory-developed biofilms, and a lack of field applications were identified among the major factors that hinder the practical application of bioreceptive concrete in the building envelope. Our ongoing field tests have shown that concrete’s controlled and aesthetically pleasant greening may be achieved in several years. We argue that such nature-integrated solutions would emphasize the beauty of the aging buildings while offering clear, practical benefits. Full article

Throughout the eighteenth and early nineteenth centuries, slavery was a central element of life in colonial and early national New York. The places where the enslaved buried their dead, referred to today as African Burial Grounds, remain important sites of reflection and remembrance for many New Yorkers. However, little literature exists discussing New York’s African Burial Ground sites from a broad, comparative perspective. This study examines seven African Burial Grounds in New York City and the Hudson Valley, two historically significant regions of New York State. GIS data from all seven sites, considered alongside GIS data from nearby coeval white Christian cemeteries, reveal that while the individuals interred in New York’s African Burial Grounds represent a variety of lived experiences, certain unifying patterns nonetheless emerge in the spatial dialectics of their final resting places. The findings have implications for the preservation of Black cultural heritage throughout southeastern New York State. Full article

Casablanca, Morocco’s largest Atlantic port city, faces increasing exposure to floods, drought, and other risks that align with legacies of urban transformations carried out during the colonial period. This study examines how early-20th-century interventions—including the canalization and burial of the Oued Bouskoura, extensive coastal reclamation, and the implementation of rigid zoning—were associated with a reconfiguration of the city’s hydrology and coincide with persistent socio-spatial inequalities. Using historical cartography, archival sources, and GIS-based overlays of colonial-era plans with contemporary hazard maps, the analysis reveals an indicative spatial correlation between today’s high-risk zones and areas transformed under the Protectorate, with the medina emerging as one of the most vulnerable districts. While previous studies have examined either colonial planning in architectural or contemporary climate risks through technical and governance lenses, this article illuminates historically conditioned relationships and long-term associations for urban resilience. In doing so, it empirically maps spatial associations and conceptually argues for reframing heritage not only as cultural memory but as a climate resource, illustrating how suppressed vernacular systems may inform adaptation strategies. This interdisciplinary approach provides a novel contribution to postcolonial city research, climate adaptation and heritage studies by proposing a historically conscious framework for resilience planning. Full article

There is a growing interest in protecting pollinators in cities as part of efforts to promote biodiversity and sustainable development. However, many initiatives setting up urban apiaries or CSR campaigns remain superficial and do not take into account the real needs of wild pollinators. The article examines whether various interventions like promoting the protection of bees (and other pollinators), rain gardens, and green roofs align (or do not align) with the biodiversity conservation objectives. A review of practices was conducted, identifying cases of beewashing and comparing the ecological effects of establishing apiaries with activities that promote wild pollinators. Particular attention was paid to the analysis of the bee density index, which was used to assess the relationship between the number of bee colonies and the availability of food resources and highlight the risk of overpopulation and its potential consequences. The results indicate the occurrence of overgrazing, which refers to an excessively high density of breeding bee apiaries in each studied NUTS 1 region, and their number has been steadily increasing over the analyzed period. An analysis of available strategic and planning documents of selected cities (particularly provincial capitals and Poland’s largest urban centers) reveals limited commitment to pollinator protection. Although the analysis was conducted for macroregions in Poland, this work also indicates how to properly design and communicate pollinator-friendly urban activities to truly support ecological resilience and sustainable urban development, not only in the case of Poland but also more broadly. Full article

Digital transformation embeds smart cities, e-health, and Industry 4.0 into critical infrastructures, thereby increasing reliance on digital systems and exposure to cyber threats and boosting complexity and dependency. Research involving over 200 executives reveals that under rising complexity, only 15% of cyber risk investments are effective, leaving most organizations misaligned or vulnerable. In this context, the role of artificial intelligence (AI) in cybersecurity requires systemic scrutiny. This study analyzes how AI reshapes systemic structures in cyber risk management through a multi-method approach: literature review, expert workshops with practitioners and policymakers, and a structured kill chain analysis of the Colonial Pipeline attack. The findings reveal three new feedback loops: (1) deceptive defense structures that misdirect adversaries while protecting assets, (2) two-step success-to-success attacks that disable defenses before targeting infrastructure, and (3) autonomous proliferation when AI applications go rogue. These dynamics shift cyber risk from linear patterns to adaptive, compounding interactions. The principal conclusion is that AI both amplifies and mitigates systemic risk. The core recommendation is to institutionalize deception in security standards and address drifting AI-powered systems. Deliverables include validated systemic structures, policy options, and a foundation for creating future simulation models to support strategic cyber risk management investment. Full article

Wireless Sensor Networks (WSNs) face persistent challenges of uneven energy depletion, limited scalability, and reduced network lifetime, all of which hinder their effectiveness in Internet of Things (IoT) applications. This paper introduces a hybrid framework that integrates Bluetooth Low-Energy (BLE) mesh networking with Ant Colony Optimization (ACO) to deliver energy-aware, adaptive routing over a standards-compliant mesh fabric. BLE mesh contributes a resilient many-to-many topology with Friend/Low-Power Node roles that minimize idle listening, while ACO dynamically selects next hops based on residual energy, distance, and link quality to balance load and prevent hot spots. Using large-scale simulations with 1000 nodes over a 1000 × 1000 m field, the proposed BLE-ACO system reduced overall energy consumption by approximately 35%, extended network lifetime by 40%, and improved throughput by 25% compared with conventional BLE forwarding, while also surpassing a LEACH-like clustering baseline. Confidence interval analysis confirmed the statistical robustness of these results. The findings demonstrate that BLE-ACO is a scalable, sustainable, and standards-aligned solution for energy-constrained IoT deployments, particularly in smart cities, industrial automation, and environmental monitoring, where long-term performance and adaptability are critical. Full article

This scientific article presents an innovative approach to optimizing routes of high-altitude unmanned aerial vehicles (UAVs) for effective monitoring of smart cities. The main proposed method is based on the ant colony optimization (ACO) algorithm with the implementation of an inverse pheromone mechanism—a repulsion-based exploration strategy. Unlike standard pheromones that encourage exploitation of frequently visited paths, this approach promotes exploration of unvisited areas by repelling UAVs from undesirable route sections, allowing UAVs to adapt more efficiently to dynamic changes in the urban environment. The authors developed a simulation system in the Webots environment, taking into account numerous factors: atmospheric conditions at high altitudes, potential for improved energy efficiency, urban development features, and priority of observation zones. Simulation results demonstrate that the proposed algorithm using inverse pheromones provides more effective area coverage compared to traditional route-planning methods, which may contribute to reduced UAV energy consumption and optimizing the monitoring process in real time. The research makes a significant contribution to the development of smart city technologies, offering a solution that can be integrated with existing urban monitoring systems to improve the efficiency of urban infrastructure observation, enhance security, and optimize urban resource management. Full article

The changing structure of modern cities intensifies anthropopressure, resulting in the need to create plans for the protection of biodiversity in cities. This can be achieved by establishing lawns and flower strips along the streets and maintaining parks and squares in cities, creating green infrastructure and contributing to sustainable urban development. However, this vegetation also requires protection that is safe for the environment and city residents. Entomopathogenic fungi (EPF) are among the most well-known and effective microorganisms that infect plant pests and conduct the disease process leading to their death. The aim of the study was to conduct a comparative analysis of the generic composition of EPF and determine the density of their colony-forming units (CFUs) in soils from flower strips and lawns located along the main communication routes of the city of Siedlce (Poland). Soil samples collected from two sites and two habitats (a flower strip and a lawn directly adjacent to it)—Site No. 1, Wyszyńskiego Street; Site No. 2, Jagiełły Street—in the spring and autumn of 2021/2022 and 2024. At each site within the habitat, three zones (repeats) were designated, spaced approximately 10–15 m apart. Approximately six samples were collected from each replication, and then a mixed sample was prepared. Four genera of EPF were found in the soil samples: Beauveria, Metarhizium, Cordyceps, and Akanthomyces. The location, habitat type, and season had a significant effect on the diversity of individual genera of fungi and the density of colony-forming units (CFUs) in the studied soils. The dominant types of EPF, forming the most CFUs in the soils from the studied flower strips and the adjacent lawns, were Metarhizium spp. and Beauveria spp. It was found that EPF occurred in higher densities in the soil from the studied habitats (flower strips and lawns) in autumn than in spring. Both of these semi-natural habitats constitute forms of urban greenery that increase biodiversity and provide valuable ecosystem services that support sustainable urban development. Full article

Historical legacies of enslavement and apartheid structural violence underpin the societal fabric of Cape Town. Walking through the city of Cape Town, colonial reminders and bastions of white supremacy remain evident in statues, street names and the continued spatial apartheid present in the public space. Sites of intergenerational trauma remain scattered through the city, retraced and reclaimed through the efforts of community members, activists, artists and museums. This paper focuses on how race and memory are represented, resisted and challenged within popular culture in Cape Town, South Africa. Through considering museums and music as sites of public memory, this paper highlights how collective memory is being constructed in post-apartheid South Africa in ways that challenge white supremacist and colonial memory. Focusing on two case studies, the Iziko Slave Lodge and Youngsta CPT’s song YVR, this paper shows how colonial and apartheid conceptualisations of race are constantly being contested in post-apartheid popular culture to resist colonial memory and recreate new public memories. Full article

Roman cities represent the Empire’s broader approach to urban planning, characterized by geometric precision and a strategic layout. Their spatial organization reflects the underlying military and administrative objectives, which can be better understood through new analytical tools. This research investigates the Roman military strategy behind the establishment of Timgad, a Roman archeology in Algeria, using Space Syntax Analysis (SSA) to examine its spatial and urban structure. This study highpoints how its spatial configuration was intricately linked to military tactics aimed at asserting control and dominance by analyzing the city’s grid-like layout and applying SSA indicators, such as Connectivity, Integration, Entropy, Control, Controllability and Through Vision (via Axial Map and Visibility Graph Analysis). The results show high value in these indicators, especially in areas where military structures were strategically located along main roads and key urban nodes, demonstrating a careful exertion to maintain surveillance and authority over space. This spatial configuration reveals a deep synergy connecting military logic and urban design, sustaining the idea that Roman town planning supported both functional and symbolic roles in establishing imperial authority. This study concludes that Roman military strategy was not only central to their territorial expansion but also instrumental in shaping long-lasting urban models, influencing the structure of colonial cities far beyond their time. Timgad thus serves as an influential case of how military requirements shaped the built environment in the Roman Empire. Full article