摘要：Patterning ultrathin MoS2 layers with regular edges or controllable shapes is appealing since the properties of MoS2 sheets are sensitive to the edge structures. In this work, we have introduced a simple, effective and well-controlled technique to etch layered MoS2 sheets with well-oriented equilateral triangular pits by simply heating the samples in air. The anisotropic oxidative etching is greatly affected by the surrounding temperature and the number of MoS2 layers, whereby the pit sizes increase with the increase of surrounding temperature and the number of MoS2 layers. First-principles computations have been performed to explain the formation mechanism of the triangular pits. This technique offers an alternative avenue to engineering the structure of MoS2 sheets.

摘要：The interface properties in two-dimensional(2D)layered materials and their van der Waals(vdW)homo-/heterostructures are of importance in both uncovering novel physical phenomena and optimizing device *** considerable research interest and enthusiasm direct toward the interlayer coupling in 2D homo-and heterostructures,there is limited research on the coupling at the 2D layered material-substrate *** limitation is due to the challenges in achieving direct ***,the coupling mechanisms at the 2D layered material-substrate interface is ambiguous,which needs greater *** this study,we have systematically investigated the interface coupling between monolayer WS_(2)and its supported substrates using high-temperature and high-vacuum in-situ Raman spectroscopy through monitoring the low-frequency Raman mode of monolayer WS_(2).Our findings reveal that both interfacial spacing and strain can significantly affect the coupling strength between the monolayer WS_(2)and the supported *** notably,we found that the strategic introduction of appropriate interfacial strain can effectively enhance the interface ***,we have succeeded in achieving effective regulation of the sample-substrate coupling via a convenient way of controlling the cooling process during *** findings contribute to a deeper understanding of the coupling correlation between 2D layered materials and substrates,which is of great significance for the design and optimization of high-performance devices based on 2D layered semiconductors.

摘要：神经系统通过时间空间编码的形式表征外部刺激所包含的信息,针刺作为神经系统的一种外部刺激,使神经元产生丰富的放电模式.为揭示针刺信息传导与作用规律,设计了不同手法以及不同频率的针刺作用足三里时,采集脊髓背根神经电信号的实验.通过对放电波形进行小波特征提取和类选算法把放电波形进行归类,然后提取出不同刺激下的时间编码和空间编码特征.接着使用平均放电率和编码异质性系数量化了不同针刺刺激下编码的特征.研究发现捻转法与提插法产生的神经电信号差异较大,这种差异主要表现在针刺手法对于参与编码神经元的选择性,但对于不同频率的针刺作用,这种编码选择性并不明显.此外,数据分析中还发现了神经系统对于针刺作用的适应性和饱和特性.