Hua Chen

Dec 7, 2024 | mdpi.com | Di Zhang |Min Zhou |Zhiyu Wang |Hua Chen

1. IntroductionArtificial intelligence (AI) techniques have been recognized as powerful tools for microwave filter design and modeling problems [1,2]. These techniques include space mapping (SM) [3,4], radial basis function (RBF) [5], support vector machines (SVM) [6], and neural-transfer function (neuro-TF) [7]. The reported forward models are all full-wave electromagnetic (EM) surrogate models, which require the iterative use of optimization algorithms to verify the design parameters [8,9].

Dec 3, 2024 | mdpi.com | Hua Chen

Nov 26, 2024 | nature.com | Hua Chen

AbstractA model for studying displacement damage in irradiated HfO2 ferroelectric thin films was developed using deep learning and a repulsive table, combining the accuracy of density functional theory with the efficiency of molecular dynamics. This model accurately predicts the properties of various HfO2 phases, such as PO (Pca21), T (P42/nmc), AO (Pbca), and M (P21/c), and describes the atom collision-separation process during irradiation.

Jul 22, 2024 | nature.com | Hua Chen |Shaohui Chen |Zhuofeng Chen |Bingjie Mai |Jing Cao |Changxiong Wu

The tomb of Marquis Yi of Zeng was unearthed in 1978 at Leiguudun in Suizhou City, Hubei Province, China. This is the largest wooden coffin in rock pit and vertical cave in the Warring States period in China. The large wooden coffin components provide reliable material data for the study of the feudal burial system in the pre-Qin period and have high value. In this paper, the wooden coffin excavated from the tomb of Marquis Yi of Zeng was studied. By understanding the composition of wood, studying the weight gain rate, shrinkage rate, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and compression resistance, the wood reinforced by rosin and epoxy resin was compared, and the reinforcement effect and principle of the two reinforcement methods were discussed. The study found that the wood properties of rosin reinforced group were better than those of epoxy reinforced group in the aspects of compressive strength, weight gain rate and volume shrinkage rate, and the mechanical properties of wood were significantly improved. In addition, methanol or ethanol can be used to dissolve the rosin shellac in this strengthening process, which can achieve reversible strengthening treatment. The results provide valuable examples and research ideas for the selection of different conservation techniques of large wooden cultural relics unearthed in the middle and lower reaches of the Yangtze River during the Warring States Period.

Jul 18, 2024 | mdpi.com | Meng Chen |Hua Chen |Zeheng Wu |Yu Huang

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