While standard computational protocols for density functional theory(DFT)have universal applicability,differences exist in code implementations.Specific applications require manual parameter optimization,whereas high-throughput calculations employ pre-defined workflows.This paper uses the bandgap as a key property to reveal the impact of computational workflow differences on the reproducibility of high-throughput calcula-tion results.The study proposes basic requirements for ensuring reproducibility:using structures optimised using the same procedure as used to calculate properties and ensuring Brillouin zone integration grid accuracy.This research establishes a foundation for the reproducibility of DFT calculations and reliable application of results,which is of great significance for method development and artificial intelligence model training.
We construct the K0-group of C* algebra C*(G)of finite group G.By in-vestigating the projections of C*(G)and the characters table of group G,we compute K0(C*(G))explicitly.
The rapid development of the drone industry brings security risks to low-altitude airspace in important places. In order to effectively defense unmanned aerial vehicles (UAV), it is of great significance to develop a system which can identify drone models by radio signal. To identify similar UAVs, a UAV signal recognition method based on re-classification and separation of image transmission signal (ITS) and flight control signal (FCS) is proposed. The OFDM time domain parameters of ITS are extracted for model pre-classification. Then, after extracting the time-frequency features of ITS and FCS respectively, the UAV can be identified with high precision by SVM. The experimental results show that the average accuracy of the four DJI UAVs can reach more than 95% when the signal-to-noise ratio (SNR) is 0dB.
Solid oxide fuel cell(SOFC)is an energy conversion technology that can directly transform chemical energy into electric energy.It possesses characteristics of high efficiency,flexible fuel choice,and strong impurity tolerance.In recent years,there has been increased research focus on the application of SOFC in transportation.This study starts from the working principle of SOFC,analyses the application advantages of SOFC in transportation,and introduces the forms of application of SOFC in transportation,including as an aux-iliary power unit and powertrain.The calculated efficiency of well-to-wheel(WTW)as a power system is 34％-39％,which is much higher than that of internal combustion engines(14％-17％)and batteries(27％),demonstrating the potential of SOFC as a powertrain in transportation.Then,the research progress of the SOFC power system is presented,including principle verification,energy efficiency improvement,and research on the pow-ertrain performance.Finally,the current application status of SOFC in transportation is summarized,and its application prospects are discussed.SOFC holds substantial potential for application in transportation and can contribute to its decarbonization.
Lithium-sulfur(Li-S)batteries have been considered as one of the most promis-ing systems for next-generation high-energy rechargeable Li batteries owing to their high theoretical energy density,safe operation,cost effectiveness,and environmental friendliness.However,the shuttle effect of polysulfide in the charge-discharge process of Li-S battery degrades its performance in a long-term cycle.MXene-based materials possess excellent electrical conductivity and high specific surface area,which can effectively avoid the shut-tle effect of polysulfide owing to their enhanced chemical adsorption capacity and catalytic conversion ability,thereby improving the cycle stability and magnification performance of Li-S batteries.This paper briefly describes the advantages of using MXene-based mate-rials in Li-S batteries,summarises the application status of MXene-based composites in the positive electrodes and separators of Li-S batteries,and the influence of MXene-based materials on the shuttle effect of Li-S batteries.Finally,the future research direction of MXene-based materials in the field of Li-S batteries is prospected.
