Garnet-type solid-state electrolytes (SSEs) show great potential because of high ionic conductivity and steadiness against metallic Li. However, the unstable property of garnet in air and poor interface contact with Li metal dramatically influence the electrochemical performance. In this manuscript, TiO2 gel is coated on the surface of Li6.75La3Zr1.75Ta0.25O12 (LLZTO) pellets by a spin coating process, to remove the surface impurity and in-situ construct an air-stable and lithiophilic LixTiyOz (LTO) layer on the garnet electrolyte surface. The LTO interface layer acts as a critical role in the interface resistance reduction and suppression of Li dendrite growth. The low interfacial resistance (18.4 Ω cm2) in Li|LTO@LLZTO|Li symmetric cells manifests good wettability. Density functional theory (DFT) calculation results indicate that the modification layer owns higher work of adhesion and interfacial energy, suggesting excellent stability and inhibition in Li dendrite growth. Specifically, the Li symmetric cells with LTO-modified electrolyte show an enhanced current density of 0.9 mA cm-2 and outstanding capability to survive long cycling over 5000 h at 0.1 mA cm-2. The assembled LiFePO4-based full cell displays both high reversible capacity and cycling capability. This work provides a promising strategy to take advantage of interfacial Li2CO3 impurities on the garnet electrolytes.
Sodium metal batteries, known for their high theoretical specific capacity, abundant reserves, and promising low-temperature performance, have garnered significant attention. However, the large ionic radius of Na
Conductor on round core (CORC) cables with the features of flexibility and a high engineering current density have been a potential candidate for high magnetic field magnets and accelerator magnets. In these applications, reducing the magnetization loss generated in superconductors is essential in the process of design. CORC cables fabricated by multifilament-coated conductor (CC) tapes have been proved to have a low magnetization loss. However, the degradation of the critical current (I c ) and additional coupling losses significantly affects the performance of CORC cables. In this article, ultraviolet laser cutting technology is used to scribe both the superconducting layer and copper stabilization layers into narrow filaments. First, the magnetization loss of a single tape with different numbers of filaments was measured by a calibration-free method. Then, based on the testing results of a single tape, two typical CORC cables are wound by 10-mm-wide and 4-mm-wide CC tapes. The magnetization loss of cables made of striated tapes was discussed by both experimental and numerical methods. It is found that the magnetization loss significantly decreases with an increasing number of filaments under a high background magnetic field. The magnetization losses decrease in CORC cables made of striated CC tape. Due to the reduced coupling loss and attenuated shielding effect, there is not much difference between the two values of the magnetization loss reduction rates in CORC cables and single tapes. The conclusions obtained in this article will be instructive for the future design of CORC cables.
Oedichirus flammeus Koch, 1939 (Zhejiang, East China), O. damingensis sp. n. (Guangxi, South China), and O. pengzhongi sp. n. (Hainan, South China) are (re-)described and illustrated. The genus is now represented in China by eight described species, six of them are micropterous. The latest key to the Oedichirus species of China is modified to include the new species.
Abstract It has been proposed that the production planning in semiconductor manufacturing is facing great challenges with the hundreds kinds of product mix and the shorter life cycle for a single product, which means that only limited historical data of a single product can be used to support the decision-making. In order to research the demand forecasting for production planning decision-making of product mix with shorter life cycle, a demand forecasting system for production planning decision-making support based on clustering is proposed first in this article, which includes four parts: clustering, pattern recognition, interval estimation and forecasting. Second, a new optimised fuzzy short time-series (FSTS) clustering method is developed to group the hundreds kinds of single products into a few product families by quantifying the interactions of the product mix, where fuzzy subtractive clustering is introduced to identify the categories numbers, while genetic algorithm (GA) is applied to confirm the initialisation of fuzzy central matrix, and weight-FSTS clustering is employed for better trend description. After the product mix is clustered into several product family, for a certain product family, the useful historical data are much more than a single product when production planning decision-making. Finally, statistical pattern recognition and nonparametric density estimate have been employed for the proposed demand forecasting procedure to support production planning decision-making. Numerical experimental data in a semiconductor manufacturing factory show the feasibility and effectiveness of the new optimised FSTS clustering method and proposed demand forecasting system for production planning decision-making. Keywords: production planningproduct mixshorter life cycleclusteringforecastingoptimised FSTS Acknowledgements This study is sponsored by the National Natural Science Foundation of China under Grant Nos 70701007 and 51075060, supported by the Technology Support Plan of Sichuan province under Grant No. 09ZQ026-054 and also by the Youth Foundation of University of Electronic Science and Technology of China (UESTC). The authors also gratefully acknowledge the helpful comments and suggestions of the reviewers, which have improved the quality of this article.
Disaster prevention and reduction of the power grid is an important guarantee for the power grid to withstand external disasters and ensure safe operation. Extra-high voltage(EHV) and ultra-high voltage(UHV) transmission line corridors usually traverse sparsely populated forest areas and span a long distance, so they are more susceptible to natural disasters such as vegetation fires. In this paper, 73 vegetation fire trip accidents of overhead transmission lines with the voltage level of 500kV, ± 500kV and ±800kV within the jurisdiction of China Southern Power Grid Co., Ltd.(CSG) from 2014 to 2022 are statists. Their temporal and spatial distribution pattern and influencing factors are analyzed. The results show that vegetation fire trip accidents mainly occur at 500kV, and the reclosing success rate is only 34.92%. The trip accidents mainly appear from February to April every year, and the period is mainly from 12:00 to 20:00. The risk of fire trip accidents is the highest in compound forest vegetation mainly contains pine trees. Meteorological parameters mainly have a great influence on the occurrence probability and spreading speed of fires. The conclusion of this study can provide a reference for reducing the vegetation fire trips of the power grid.
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