基于Web的数控机床误差参数辨识系统

误差参数辨识是误差补偿的前提.本文首先介绍了误差辨识的原理,然后采用B/S模式、3层体系结构和.Net Remoting技术设计并实现了基于Web的误差参数辨识系统.通过实例运行,证明该系统的设计是可行的,从而为实现基于Web的误差补偿技术奠定基础.     

Salt‐Assisted Synthesis of 2D Materials

2D materials have demonstrated good chemical, optical, electrical, and magnetic characteristics, and offer great potential in numerous applications. Corresponding synthesis technologies of 2D materials that are high‐quality, high‐yield, low‐cost, and time‐saving are highly desired. Salt‐assisted methods are emerging technologies that can meet these requirements for the fabrication of 2D materials. Herein, the recent process for the salt‐assisted synthesis of 2D materials and their typical applications are summarized. First, the properties of salt crystals and molten salts are briefly introduced, and then some examples of 2D materials synthesis with the assistance of salt as well as their representative applications are presented. The underlying mechanisms of salts with different states on the formation of 2D morphology are discussed to aid in the rational design of synthetic route of 2D materials. At last, the challenges and future perspectives for salt‐assisted methods are briefly described. This review provides guidance for the controllable synthesis of 2D materials based on the salt‐assisted approaches.     

一种新型 10 kV 配电网不停电作业工具改进与应用

在开展10 kV配电网不停电绝缘杆作业时,为保证作业安全,各类绝缘抱杆是必不可少的辅助工具。针对行业内传统绝缘抱杆普遍存在一定局限与缺点的现状,提出制作一种新型综合绝缘抱杆,从主体设计、稳固措施、安全性能、适用范围、安装流程等方面改进传统抱杆,进一步提高绝缘杆作业法开展安全性,拓宽绝缘杆作业法开展范围。     

Cobalt doping boosted electrocatalytic activity of CaMn3O6 for hydrogen evolution reaction

The development of earth-abundant-metal-based electrocatalysts with high efficiency and long-term stability for hydrogen evolution reaction(HER)is crucial for t...     

5G网络技术研究现状和发展趋势

摘要：首先分析了5G 网络中的新需求对移动通信网络的挑战,从而说明进行5G 网络技术研究的必要性。随后,介绍了目前国内外研究组织在5G 网络相关技术的研究进展,包括NGMN、5GPPP、IMT-2020等,同时也介绍了国内外标准化组织对5G网络技术的标准化研究进展。基于对5G网络中的新需求、新挑战的分析,结合国内外关于5G网络技术研究现状的总结,预测了未来5G网络技术的发展趋势并给出了相关的技术发展方向。最后对5G网络的发展进行了总结和展望。     

Mass Production of High‐Quality Transition Metal Dichalcogenides Nanosheets via a Molten Salt Method

2D transition metal dichalcogenides (TMDs) are well suited for energy storage and field–effect transistors because of their thickness‐dependent chemical and physical properties. However, as current synthetic methods for 2D TMDs cannot integrate both advantages of liquid‐phase syntheses (i.e., massive production and homogeneity) and chemical vapor deposition (i.e., high quality and large lateral size), it still remains a great challenge for mass production of high‐quality 2D TMDs. Here, a molten salt method to massively synthesize various high‐crystalline TMDs nanosheets (MoS₂, WS₂, MoSe₂, and WSe₂) with the thicknesses less than 5 nm is reported, with the production yield over 68% with the reaction time of only several minutes. Additionally, the thickness and size of the as‐synthesized nanosheets can be readily controlled through adjusting reaction time and temperature. The as‐synthesized MoSe₂ nanosheets exhibit good electrochemical performance as pseudocapacitive materials. It is further anticipates that this work will provide a promising strategy for rapid mass production of high‐quality nonoxides nanosheets for energy‐related applications and beyond.     

Structure Confined Porous Mo2C for Efficient Hydrogen Evolution

Molybdenum carbide (Mo₂C) has been widely applied in energy conversion, electrocatalysis, and other electronic devices, but its nanostructure with certain morphology and porous structure is tough to control. In this work, 1D or 2D porous Mo₂C nanostructures can be synthesized by carburizing cobalt‐based zeolitic imidazolate framework (ZIF‐67) cladding MoO₃ nanowires or nanosheets hybrid structure under high temperature. The obtained 2D porous Mo₂C shows a low onset overpotential (η = 25 and 36 mV) and a small Tafel slope (40 and 47 mV dec^?1) in 0.1 m HClO₄ and 0.1 m KOH as well as great stability. This work highlights a new strategy for the design and synthesis of porous nanostructure Mo₂C electrocatalysts.     

基于RF的智能家居无线通信网络系统设计

将基于433MHz频段的无线RF模块应用于智能家居系统中,用于组建家庭内部无线通信网络系统。其低成本、低功耗、穿越障碍能力强和体积小等特点,非常适合在智能家居系统中普及应用。最终使普通人群能够体验物联网智能家居生活。     

河北中钢公司全连续冷连轧机自动控制系统

河北中钢公司五机架全连续冷连轧机组是我国首条自主研制开发的全连续冷连轧生产线,北京科技大学高效轧制国家工程研究中心承担了该机组控制系统的设计开发。介绍了该生产线自动控制系统的基本结构和主要功能。系统已在河北中钢公司投入使用,证明是安全、可靠和稳定的。