Search

The size of the elderly population in China has been increasing, and according to UN standards and relevant data, China has entered an aging society. With the aging of the population, residents' pension has become the focus of attention of the public and governments at all levels. Therefore, based on the life cycle theory, this paper considers the index and conversion coefficient of community coverage and elderly population coverage of pension service facilities in Hefei, Anhui Province. The problems existing in the spatial allocation of urban pension service facilities were also examined. This study developed the evaluation criteria for the rationality of spatial allocation of urban elderly service facilities in Hefei and analyzed their construction and spatial distribution characteristics by using GIS spatial methods, such as kernel density and network analysis. The rationality of spatial allocation was evaluated from three different spatial scales—cities, administrative regions, and streets—to provide a theoretical basis for the formulation of optimization measures. The results were as follows: 1) The supply of urban elderly care in Hefei is mainly based on community elderly care services, and the number and volume of care facilities are quite different among the four administrative regions. 2) The spatial distribution and configuration rationality of pension service facilities decrease from the urban center to the surrounding areas. The new urban area is weak in terms of pension service supply. The coverage rate of the elderly population in old urban areas is significantly higher than that in new areas. 3) The rationality of spatial allocation of urban pension service facilities is more significant at the street level, and the coverage of similar streets shows obvious spatial aggregation characteristics. Based on the residential area coverage rate of pension service facilities, this paper proposes the concept of elderly population coverage rate, and establishes the conversion coefficient between the two, which is the innovation of the research method adopted in this study. In addition, the rationality evaluation standard of spatial allocation of pension service facilities is constructed, providing a basis for rationality evaluation analysis. Through a comparative study of different spatial levels of cities, administrative districts, and streets, it was found that the evaluation of spatial allocation rationality of pension service facilities is closely related to the spatial scale: the smaller the spatial scale, the more accurate the evaluation. The results of this study could be useful for relevant research on other similar cities. Further, this study has practical significance for the allocation and layout of urban elderly service facilities. In other words, in the process of constructing the life cycle, the spatial distribution characteristics of service objects should be fully considered in the allocation of public service facilities, and attempts should be made to achieve a high spatial matching between "people" and "facilities".

FePS$_3$ is a prototype van der Waals layered antiferromagnet and a Mott insulator under ambient conditions, which has been recently reported to go through a pressure-induced dimensionality crossover and an insulator-to-metal transition. These transitions also lead to the appearance of a novel magnetic metallic state. To further understand these emergent structural and physical properties, we have performed a first-principles study using van der Waals and Hubbard $U$ corrected density functional theory including a random structure search. Our computational study attempts to interpret the experimental coexistence of the low- and intermediate-pressure phases and we predict a novel high-pressure phase with distinctive dimensionality and different possible origins of metallicity., Re-Submission to SciPost

The poor mechanical properties of self-healing hydrogels limited their applications in the fields of biomedicine and industry. Here, a series of self-healing polymeric ionic liquid (PIL) hydrogels with high mechanical strength and electrical conductivity were prepared through hydrophobic association. Hydrophilic monomer vinyl ionic liquids (VILs) based on choline and amino acids, acrylamide (AAm) and hydrophobic monomers stearyl methacrylate (C18) were copolymerized in a micellar solution of sodium dodecyl sulfate (SDS); meanwhile, bacterial cellulose was introduced to enhance the mechanical strength of hydrogels. The resultant hydrogels exhibited excellent mechanical strength (5.8 MPa), extensive elongation at break (4250%) and outstanding self-healing efficiency (85%) without any external intervention. Even after healing, the tensile strength of most hydrogels could reach 2.5–3.9 MPa. At the same time, the incorporation of ILs endowed hydrogels with good electrical conductivity (a maximum of 1.258 S/m). These excellent properties predicted the potential application of the obtained PIL hydrogels in the fields of biomedicine and industry.

Submitted version

Additional file 1: Table-S1 Introduction of anesthesia-related adverse events (ARAEs).

Bacterial cellulose(BC) is a kind of extracellular polymer synthesized by bacteria and it has very wide applications in many fields. However, the application of BC in a large commercial scale can still not be fulfilled due to the low yield and demanding for BC membranes with very different properties. To this end, a new BC-producer Komagataeibacter rhaeticus TJPU03 was isolated from rotten orange peel, which produced 8.28 ± 0.27 g/L(dry weight) in standard HS medium at the 10th day. The membrane is easier to be purified by one-step alkaline treatment and the produced BC(K-BC) membranes possess homogeneous, looser and more porous three-dimensional network composed by thinner cellulose fibrils. However, the wet K-BC possesses stronger mechanical properties and exhibits lower toxicity and higher cytocompatibility to mammalian cell. Owing to the more porous and homogeneous network, K-BC possesses high loading capacity of cell and protein drugs. Also, it exhibits sustained-controlled release ability for proteinaceous drug. The high yield of this strain and the special characteristics of K-BC predict this strain to be a very promising BC-producer and broad applications of K-BC in the fields of wound healing, scaffolds of tissue engineering, tissue repair and regeneration.

This research presents the process for a systematic literature review examining factors that contribute to runway incursions (RIs). A systematic literature review uses other research results as data for systematic analysis. Runway safety is a top priority. In the US, RIs have been increasing and typically three RIs occur every day. This paper identified 134 articles using 22 databases. Filtering criteria and analysis identified six contributing categories: human factors, airport geometry, technical factors, airport characteristics, environmental factors, and organizational factors. Recommendations for reduction of RIs and suggestions for further studies are presented based on these factors.