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The paper analysed the impact of accessibility of urban parks within the third ring on housing prices of Fuzhou through network analysis and SPSS correlation analysis based on data of sources like remote-sensing image, web crawling and urban road network, discovering that: (1)The density of residence within the third ring of Fuzhou decreases from the centre to the edges; (2) The housing price, ranging between 18000 and 28000 RMB/ m2, peaks in the city centre; (3) For houses within the third ring of Fuzhou, Gulou District enjoys the greatest access to urban parks while Cangshan District is the poorest in this regard. (4) The residence within the third ring of Fuzhou could be rated as A or A- in terms of access to urban parks, with an overall excellence performance; (5) The walking distance to the parks is significantly correlated with the housing price. The shorter the distance, the higher the price. Regarding this, the paper proposed the following suggestions: (1) Revise the routes to Gaogai Mountain Park by increasing entrances and exists to improve its accessibility; (2) Improve the transportation network and increase footpaths to the park, thus shortening the distance between the park and the surrounding residences.

The wireless power transfer (WPT) system based on the parity–time (PT) symmetry can realize stable power transmission with constant efficiency and output power in the PT‐symmetric region. In some applications with long transmission distance requirements, such as medical treatment, it is meaningful to expand the PT‐symmetric region by reducing the critical coupling coefficient. Therefore, a novel WPT system based on PT symmetry with a boost converter in secondary side is proposed in this article to expand the transmission range. The circuit theory is used to analyze the presented system. Then two models with different drive signals of the boost converter are established and simulated respectively to show the effect of the proposed system compared with the original PT‐symmetry‐based WPT system. Finally, the experimental results verify that the proposed system can play a role in extending the stable transmission distance or in suppressing the output power growth of the PT‐symmetric‐based WPT system. [ABSTRACT FROM AUTHOR]

Aqueous zinc‐ion batteries have drawn increasing attention due to the intrinsic safety, cost‐effectiveness and high energy density. However, parasitic reactions and non‐uniform dendrite growth on the Zn anode side impede their application. Herein, a multifunctional additive, ammonium dihydrogen phosphate (NHP), is introduced to regulate uniform zinc deposition and to suppress side reactions. The results show that the NH4+ tends to be preferably absorbed on the Zn surface to form a "shielding effect" and blocks the direct contact of water with Zn. Moreover, NH4+ and (H2PO4)− jointly maintain pH values of the electrode‐electrolyte interface. Consequently, the NHP additive enables highly reversible Zn plating/stripping behaviors in Zn//Zn and Zn//Cu cells. Furthermore, the electrochemical performances of Zn//MnO2 full cells and Zn//active carbon (AC) capacitors are improved. This work provides an efficient and general strategy for modifying Zn plating/stripping behaviors and suppressing side reactions in mild aqueous electrolyte. [ABSTRACT FROM AUTHOR]

Leptospirosis is an important zoonosis that is caused by pathogenic Leptospira, which is considered to be a re-emerging infectious disease in many countries. Rodents are the most important reservoirs for both human and animal infection. An epidemiological survey of pathogenic Leptospira in rodents is important for the prevention and control of leptospirosis. In this study, a total of 964 rodents were captured from six cities in Hubei Province, and two pathogenic Leptospira species (L. interrogans and L. borgpetersenii) were detected using nested PCR with an overall prevalence of 4.8%. L. interrogans was distributed in five sampling sites, which may be the dominant species of pathogenic Leptospira in Hubei Province. In addition, Rattus norvegicus showed a relatively high infection rate, which may play an important role in the transmission and infection of pathogenic Leptospira. This study reveals the prevalence of pathogenic Leptospira in wild rodents in Hubei Province, suggesting that the risk of leptospirosis infection in Hubei Province still exists. [ABSTRACT FROM AUTHOR]

To promote the commercial application of sodium ion batteries (SIBs), new high‐stability and high‐capacity anode materials are needed. Metal oxides show great promise, but significant issues relating to their low electrical conductivity and unstable structure during charge storage must be resolved. Herein, a new composite anode consisting of pseudohexagonal Nb2O5 (TT‐Nb2O5) nanoparticles strongly anchored to carbon nanotubes (CNT) through a glucose‐derived carbon framework (Nb2O5/g‐CNT) was synthesised and assessed for use as the anode in SIBs. This represents the first application of TT‐Nb2O5 in SIBs. The composite is shown to offer high specific capacity (203 mAh g−1 at 0.2 A g−1), good rate capability (53 mAh g−1 at high current density of 5 A g−1), and a high‐capacity retention rate (135 mAh g−1 at 0.2 A g−1 between 25 and 300 cycles). This is attributed to high electrical conductivity and flexibility offered by the designed carbon framework, the superior capacity of the TT‐Nb2O5 and the linkage between the two provided by the bonding glucose derived carbon. This work therefore demonstrates a scalable route for the application of metal oxides in future high‐performance SIB systems. [ABSTRACT FROM AUTHOR]

Herein, we present a freestanding and flexible 3D nanocomposite made of polyhedral spherical FeCoS2 and nitrogen-doped hollow carbon nanofibers (FeCoS2@N-HCNFs) that is synthesized through coaxial electrospinning, high-temperature calcination, and a facile solvothermal process. As a binder-free anode composite for potassium-ion batteries (PIBs), FeCoS2@N-HCNF presents a high specific discharge capacity on the first lap (701.2 mA h g−1 at 100 mA g−1) and superior cycling stability (132.6 mA h g−1 at 3200 mA g−1 after 600 cycles). The impressive electrochemical performance can be ascribed to the unique 3D structure, such as the enormous specific surface area of the mesoporous structure beneficial for K+ transfer, the three-dimensional hollow carbon nanofiber scaffold enhances the structural stability, and polyhedral spherical FeCoS2 improves the overall specific capacity. According to the above description, the FeCoS2@N-HCNF anode is a promising candidate for advanced potassium-ion batteries. [ABSTRACT FROM AUTHOR]

A general analytical model, formulated in 2-D polar coordinates, is developed to predict the unbalanced magnetic force, which results in permanent-magnet brushless ac and dc machines having a diametrically asymmetric disposition of slots and phase windings. It is shown that the unbalanced magnetic force can be significant in machines having a fractional ratio of slot number to pole number, particularly when the electric loading is high. The developed model is validated by finite-element calculations on 9-slot/8-pole and 3-slot/2-pole machines. In addition, the unbalanced magnetic force has been measured on a prototype 3-slot/2-pole machine and shown to be in excellent agreement with predicted results. Index Terms--Brushless machines, magnetic field, permanent magnet (PM), unbalanced magnetic force, unbalanced magnetic pull.