In the superconducting electrodynamics suspension (EDS) maglev, using the harmonic magnetic field of the 8-shaped coil to generate power is an effective way to address the vehicle power supply problem. This article proposes an analytical calculation model that comprehensively accounts for the magnetic field coupling among superconducting coils, 8-shaped coils, and collector coils in the topology of linear generators for EDS maglev. Firstly, by introducing the pole distance ratio k between the superconducting coil and the 8-shaped coil, the magnetic flux density distributions of the superconducting coil and the 8-shaped coil were obtained using harmonic analysis. Secondly, the mathematical expression for the maximum output power of the linear generator was derived. Furthermore, based on the principle of virtual work, an analytical model for the suspension and guiding forces of the EDS maglev, accounting for the influence of the linear generator, is constructed. Finally, linear generators corresponding to different 8-shaped coil structures were established, and the air-gap magnetic field distribution, power-generation characteristics, and dynamic performance of the EDS maglev were compared and analyzed. The analytical model proposed in this article can provide theoretical support for parameter optimization and system dynamic design of linear generators in EDS maglev.
The transition from
institutionalized care to alternative family-based care arrangements for
children and youth without available parents is an important policy aim around
the world. To document evidence on de-institutionalization (DI) and identify
gaps that are stalling the translation of DI findings into policy or practice,
we conducted a systematic scoping review of studies on de-institutionalization
published in the last five years. Our systematic search identified 221
pertinent studies covering 67 countries across most continents. The majority of
the studies were qualitative, used some type of ‘convenience’ sampling, and had
a modest number of participants (but with a broad range, 1–5351). Remarkably
few studies included children under 6 years of age. Despite small samples and
relatively weak designs, the majority of the studies suggested policy
implications of their results. We discuss the gaps in DI research, stressing
the need for transparency and replicability, paying attention to the specific
circumstances of performing DI research. To overcome these gaps, we
Recent advances in nanostructured biopolymers have positioned cellulose-based aerogels as potential alternatives in the next generation of lightweight porous materials, given their ultralow density, hierarchical porosity, and extremely high surface area. These materials provide a renewable platform for a range of applications such as advanced energy storage, water purification, energy efficient insulation, and biomedical scaffolds. Unlike traditional silica or polymeric aerogels, cellulose derived systems provide a unique combination of mechanical toughness and biodegradability. These systems provide an environmentally safe approach to high-performance architectures. This research critically reviews the design and manufacturing techniques of biopolymer aerogels, including the choice of precursors, sol-gel chemistry, and drying techniques such as freeze-drying and supercritical CO2 extraction that control the structural stability and tunability. Special attention is beneficial to the programmable surface chemistry of cellulose nanofibrils and nanocrystals, which allows for precise control over pore shape, wettability, and hybrid assembly with nanoparticles or bioactive substances. Functionalization, particularly cross-linking, ionic interactions, and the inclusion of conductive fillers, is identified as an important control for improving performance under demanding conditions. Furthermore, life-cycle assessments show that their carbon footprint and embodied energy are much lower than those of their fossil-based counterparts. In the context of the circular economy, cellulose-based aerogels still need to overcome challenges related to cost competitiveness, moisture sensitivity, and large-scale manufacturability. Hybrid architectures and processes that are industrially viable are needed to realise their full potential.
Aortic aneurysm (AA) is a life-threatening vascular disease characterized by progressive aortic dilatation, wall degeneration, and risk of rupture. Although diameter-based imaging remains central to clinical decision-making, it does not fully reflect the biological processes underlying aneurysm initiation, expansion, and rupture. Recent advances in omics, vascular biology, functional imaging, and nanomedicine provide new opportunities to reinterpret AA pathogenesis. In this review, we propose the Four-Hit Hypothesis as an integrative framework for understanding AA progression. The four hits include disruption of the aortic barrier environment, immune-inflammatory invasion, maladaptive proliferative repair, and aging-associated structural destruction. We discuss their roles across disease stages, the differences between abdominal and thoracic aortic aneurysms, and their implications for biomarkers, imaging, and therapeutic development. This review aims to organize current evidence on AA biology and highlight potential directions for future studies in risk assessment, imaging, and targeted intervention.
