117,375 research outputs found
Major european stressors and potential of available tools for assessment of urban and buildings resilience
No full textRecent data show that there are intensifications of phenomena related to climate change, such as the increasing of heavy rains, more frequent and intense droughts connected with fires, and alterations of the local climatic conditions, including heat islands with consequent impacts on cities, districts, and buildings. Not only are natural hazards stressing Europe but also human-induced events like low-magnitude earthquakes as a direct cause of fracking or mining. This study aimed to investigate the significant stressors and summarize what impact is the most dangerous in each European country. There is a need to secure the operating conditions of urban infrastructures and to preserve a high-quality indoor environment of buildings. The main scope of this paper is to compare selected tools that evaluate the urban and building resilience and to assess their suitability, based on an analysis of natural and human-induced hazards in the European countries. The results represent a contribution to urban and architectural planning practice, and to the consistent implementation of measures to improve the resilience of the built environment by providing guidance as to which assessment tool is most suitable for each country
Embodied Energy and Global Warming Potential of Radon Preventive Measures Applied in New Family Houses
No full textRadon inside buildings represents the primary source of human exposure to ionising radiation in the world. Studies in many countries have shown that high indoor radon levels are the second most frequent cause of lung cancer. This gas can enter a building through cracks, fractures, or other leaky places in structures that are in contact with the soil, incrementing the radon concentration indoors. The radon protective measures on buildings represent embodied and operational environmental impacts, which were more or less neglected so far. Nevertheless, as buildings have become more energy-efficient, the radon preventive measures impacts are recognised as being more and more significant and shall be thoroughly investigated. This paper performs a comparative analysis of embodied primary renewable and non-renewable energy and global warming potential (GWP) for alternative preventive measures. On this basis, the paper aims to assess the additional contribution of embodied impacts of three types of radon preventive measures for a single-family house located in a potential radon prone area. The embodied impacts are calculated for the A1-A3 LCA stages associated with the radon preventive measures and compared them against each other to find the additional embodied impacts compared to a family house without radon protection. The results indicate that the embodied energy and the GWP increase as more protective elements the measure contains, also considering the impacts of soil excavation
Environmental, Social and Economic Resilience in Multi-Residential Buildings: Assessing SBToolCZ Rating System
No full textSustainable Building Tool for the Czech Republic (SBToolCZ) is the Czech national green building rating system that encourages the design of sustainable buildings by incentivising reductions in energy, water, and building materials consumption, as well as improving occupant health and community connections. In addition to reducing the overall environmental impacts, certified green buildings must also be resilient enough to withstand external stressors, most frequently the symptoms of climatic change that may arise throughout the building's lifetime. Therefore, a resilient building should be capable of adapting and remaining functional under the pressure of more frequent and severe challenges. The purpose of this study is to examine where the SBToolCZ certification system has inherent overlaps with the topics of resilience, considering the environmental, social and economic factors relevant to Central European contexts. This is accomplished by comparing the criteria of this certification system with the most accepted principles of resilient design that have emerged from the international resilience rating systems or guidelines. A number of synergistic opportunities, as well as improvements for better integrating resilient design into the SBToolCZ framework and, therefore, into green construction, are discussed to implement existing criteria or propose supplementary ones. A key component of implementing resilience for multi-residential buildings is the SBToolCZ Site category, which is key to addressing the unique regional needs of each project and should be integrated with resilience-enhancement indicators. Finally, climate projections should be used instead of historical climate data at an early design stage to improve the resilience of the building
Sustainability assessment of waterproof membranes for radon mitigation in buildings
No full textGas radon is the main source of ionising radiation for humans and the second cause of lung cancer, just after smoking. Radon is present in the ground, and its concentration differs soil by soil according to the permeability and the mineral composition. Since radon mainly penetrates a building through cracks and fractures at the foundation level, it is necessary to focus on that area. The problem of high radon indoors concentration is present largely in Europe and in those countries where the heating indoors is privileged since there is a high-temperature difference between outdoors and indoors in winter. The waterproof membranes placed continuously in the structures that are in contact with the soil are one of the cheapest and easy-to-install radon mitigation solutions. Membrane-based measures, like all remedial measures, represent operational and embodied environmental impacts; the lasts were more or less ignored so far. Still, as buildings are becoming energy-efficient and should ensure a high level of indoor comfort, the environmental impacts of these membranes are recognised as being noteworthy and shall be methodically examined. The paper aims to assess the contribution of embodied impacts of five macro-categories of membranes that could be installed to protect buildings against radon. The embodied impacts are calculated for the A1-A3 LCA stages and compared against each other in relation to one square meter and the radon resistance
Environmental assessment of several scenarios of active and passive radon control measures
No full textIn buildings, radon gas mainly enters through cracks in the floors and gaps around pipes and cables in contact with the soil, thereby increasing indoor radon levels. Like other building components or systems, the radon control measures have embodied and operational environmental impacts that have been neglected to a certain extent. While many actions have been taken recently to achieve carbon-neutral yet energy-efficient buildings, even radon control measures should be investigated not only for protecting human health since radon gas is the major source of ionising radiation for humans but also for the environment. This paper aims to undertake a comparative analysis of the embodied and operational impacts of variant radon-protective measures installed at the floor foundation level (both active and passive solutions) for new and existing buildings. In particular, this analysis includes four different measures based on radon venting from i) floor air gap created from plastic components, ii) flexible perforated pipes embedded in the gravel layer under the floor, iii) radon sump placed in the sub-floor layer, and iv) perforated tubes drilled horizontally into the subsoil under the house. In all cases, radon will be removed through a vertical exhaust pipe terminated above the roof or by a roof fan. The impacts are calculated for the life cycle assessment (LCA) stages A1-A3 (production phase) and B6 (operational energy) to determine whether future research should be focused on the reduction of environmental impacts on the production stages or the operational ones
GOLN: Graph Object-based Localization Network
No full textIn the last decades, robotic localization has been mainly addressed with Visual Odometry (VO) or Simultaneous Localization and Mapping (SLAM) approaches, which usually provide an accurate metric precision. Despite the impressive results, these approaches have some shortcomings such as the amount of memory they require and the lack of robustness in non-ideal environments. Inspired by the human capabilities, in this paper we present a novel framework, named Graph Object-based Localization Network (GOLN), to address the topological localization problem with a novel approach, characterized by low memory requirements and robustness with respect to appearance. GOLN is based on a topological map, i.e., a graph, which is fed to a Graph Network (GN) along with global visual features of the environment and returns the estimation of the position node where the robot is located. Experiments have been performed in Unreal Engine (UE4) environments with a simulated ground robot, equipped with a monocular camera
Low-impact thermal insulation materials for sustainable retrofitting: Potentialities and barriers from a literature review
No full textThe present study provides both an updated overview of the most recent studies about low environmental impact materials for building retrofitting and meta-analyses of the most important features, such as the thermal conductivity, allowing to evaluate their insulation potential against the diffused and recurrent conventional competitors. Specifically, 466 case studies about materials derived by co-production, wastes of other products and recycled ones have been selected and their thermal performances have been analysed. The materials have been clustered into homogeneous classes: lose materials and foams; structural materials; panels; finishing materials. The results show that some low environmental impact materials are characterized by thermal performances which can position them as materials able to contribute to building decarbonization, but little information can be found about other characteristics which can be crucial when the built environment is considered, such as durability, fire resistance, costs, and load resistance. Yet, these latter aspects may be investigated further when the material is considered to enter the prototyping phase whether in the academic or market context. The present study provides a base for discussion about the use of more environmentally friendly thermal insulation materials which in the coming years might represent a valid option for sustainable building renovation
Review of methods for the combined assessment of seismic resilience and energy efficiency towards sustainable retrofitting of existing European buildings
No full textSustainable retrofitting of existing buildings is a prerequisite for achieving climatic and energy objectives in the EU. Thus, practical tools supporting the evaluation and decision-making process when planning retrofit interventions are required. In specific areas, in addition to energy efficiency, the improvement in building resilience to natural hazards is requested; in several European regions, seismicity poses a significant hazard. This study aims to analyse the state-of-the-art of the integrated methods for the implementation of structural and energy retrofitting. The work consists of reviewing available tools, international sustainability protocols, and methods specifically developed for combined energy and seismic assessment. In the first group of methods, assessment is independently referred to specific criteria for energy performance and seismic safety, quantified according to available codes. Besides, in a second group, integrated evaluation is achieved considering ‘equivalent’ initial or life-cycle costs associated with energy consumption and seismic vulnerability. The collected methods were evaluated for qualitative requirements for optimal integration, such as multidisciplinary, life-cycle approaches, and other indicators. Finally, a critical evaluation is provided, highlighting what can be used for future developments toward a sustainable and resilient retrofitting of existing European buildings
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Square Dancing with the Stars to Enhance Dynamic Hirschman Linkages?
No full textIn this Presidential Address, the author takes the reader on a reconnaissance of his life and time as a regional scientist. He points out scenery he found scintillating along the way, hoping that some may pick up the banner and chew on a few of the ideas for a while. He suggests a revisit to Albert O. Hirschman’s notion of key sectors and more empirical analysis related to Marcus Berliant’s and Masahisa Fujita’s notion of knowledge creation and transfer.Presidential Address, San Antonio, Texas, March 29, 2014 (53rd Meetings of the Southern Regional Science Association
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