Electronic and optical properties of 3N-doped graphdiyne/MoS2 heterostructures tuned by biaxial strain and external electric field

The construction of van der Waals (vdW) heterostructures by stacking different two-dimensional layered materials have been recognised as an effective strategy to obtain the desired properties. The 3N-doped graphdiyne (N-GY) has been successfully synthesized in the laboratory. It could be assembled into a supercapacitor and can be used for tensile energy storage. However, the flat band and wide forbidden bands could hinder its application of N-GY layer in optoelectronic and nanoelectronic devices. In order to extend the application of N-GY layer in electronic devices, MoS₂ was selected to construct an N-GY/MoS₂ heterostructure due to its good electronic and optical properties. The N-GY/MoS₂ heterostructure has an optical absorption range from the visible to ultraviolet with a absorption coefficient of 10⁵ cm^-1. The N-GY/MoS₂ heterostructure exhibits a type-Ⅱ band alignment allows the electron-hole to be located on N-GY and MoS₂ respectively, which can further reduce the electron-hole complexation to increase exciton lifetime. The power conversion efficiency of N-GY/MoS₂ heterostructure is up to 17.77%, indicating it is a promising candidate material for solar cells. In addition, the external electric field and biaxial strain could effectively tune the electronic structure. Our results provide a theoretical support for the design and application of N-GY/MoS₂ vdW heterostructures in semiconductor sensors and photovoltaic devices.     

对频率步进毫米波导引头的干扰研究

研究毫米波成像导引头的干扰途径和方法,分析了毫米波导引头制导的特点和主要抗干扰措施,重点分析不同的干扰措施对毫米波导引头的干扰效果,仿真结果证明了分析的正确性。     

噪声调相干扰信号的性能仿真

主要针对噪声干扰中的噪声调相干扰信号进行研究,通过分析噪声调相干扰信号的性能及其对直接序列扩频通信系统的影响,建立了干扰系统和噪声调相干扰信号的仿真模型。根据仿真得出的系统影响误码率曲线,分析了不同干扰频率和不同干扰带宽下的噪声调相干扰信号对直扩系统的干扰效果,并得出了有效的结论。     

"三表合一"远程集中采集的建设前景展望探析

本文以"三表合一"背景,提出了促进平台建设的几点思路,并对其未来建设前景进行了展望.希望通过本文的论述,更好地推动我国智能电网的打造和发展.     

我国土工离心模型试验技术发展综述

小尺寸物理模型试验是岩土力学与岩土工程研究的重要手段。常规小比尺模型由于其自重产生的应力远低于原型,以及原型材料明显的非线性,因而不能再现原型的特性。解决这一问题的唯一途径是提高模型的自重,使之与原型等效。提高模型的自重应力水平、增大材料自重的最简便的方法就是用离心机。本文在总结回顾大量文献资料的基础上,根据离心模型试验技术的研究深度和应用范围,将我国土工离心模型试验技术的发展历史分为3个阶段,并分别阐述了各阶段土工离心模型试验技术在我国的应用类型及研究状况,介绍了试验设备、试验技术、数据采集等几个方面的发展历程。最后,总结指出了目前离心模型试验技术研究存在的问题,并对今后的研究和工作做了展望。