The renovation of old neighborhood plays a pivotal role in augmenting the quality of life and catalyzing urban development. Currently, numerous old neighborhoods in China necessitate renovation due to insufficient maintenance and management, inadequate supporting infrastructure, and suboptimal energy efficiency. Despite extensive research and practical endeavors dedicated to old neighborhood renovation, a research gap in critical analysis emerged during the literature review. This study endeavors a comprehensive analysis to delineate the current state of renovation endeavors, elucidate barriers encountered, and propose innovative strategies to surmount these barriers. Firstly, this study provides a comprehensive overview of ongoing status of renovation efforts and their key focal points. Secondly, this study furnishes an encompassing summary of the fundamental aspects of old neighborhood renovation, encompassing sponge city renovation, environmental enhancement, building energy-efficient renovation, elevator installation, and modernizing elderly facilities and services. Furthermore, this paper meticulously analyzes the barriers such as stakeholder conflicts, resident skepticism, funding limitations, divergent perceptions, limited resident participation, and intricate decision-making processes. To solve these identified barriers, some targeted practical solutions are proposed including bolstering the governmental leadership, exploring diversified funding mechanisms, expanding policy implementation agents, improving resident communication, and establishing collaborative multi-party framework. These measures provide practical guidance to facilitate the seamless progression of renovation initiatives. This study aspires to furnish theoretical insights, practical guidance for policy formulation, and actionable recommendations for sustainable urban neighborhood renovation, contributing to the scholarly discourse and practice in this field.@en

In cardiovascular mechanics, reaching consensus in simulation results within a physiologically relevant range of parameters is essential for reproducibility purposes. Although currently available benchmarks contain some of the features that cardiac mechanics models typically include, some important modeling aspects are missing. Therefore, we propose a new set of cardiac benchmark problems and solutions for assessing passive and active material behavior, viscous effects, and pericardial boundary condition. The problems proposed include simplified analytical fiber definitions and active stress models on a monoventricular and biventricular domains, allowing straightforward testing and validation with already developed solvers.

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Decarbonization of electricity generation can support climate-change mitigation and presents an opportunity to address pollution resulting from fossil-fuel combustion. Generally, renewable technologies require higher initial investments in infrastructure than fossil-based power systems. To assess the tradeoffs of increased up-front emissions and reduced operational emissions, we present, to our knowledge, the first global, integrated life-cycle assessment (LCA) of long-term, wide-scale implementation of electricity generation from renewable sources (i.e., photovoltaic and solar thermal, wind, and hydropower) and of carbon dioxide capture and storage for fossil power generation. We compare emissions causing particulate matter exposure, freshwater ecotoxicity, freshwater eutrophication, and climate change for the climate-change-mitigation (BLUE Map) and business-as-usual (Baseline) scenarios of the International Energy Agency up to 2050. We use a vintage stock model to conduct an LCA of newly installed capacity year-by-year for each region, thus accounting for changes in the energy mix used to manufacture future power plants. Under the Baseline scenario, emissions of air and water pollutants more than double whereas the low-carbon technologies introduced in the BLUE Map scenario allow a doubling of electricity supply while stabilizing or even reducing pollution. Material requirements per unit generation for low-carbon technologies can be higher than for conventional fossil generation: 11-40 times more copper for photovoltaic systems and 6-14 times more iron for wind power plants. However, only two years of current global copper and one year of iron production will suffice to build a low-carbon energy system capable of supplying the world's electricity needs in 2050.

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