Metal–Organic Gel‐Derived FexOy/Nitrogen‐Doped Carbon Films for Enhanced Lithium Storage

The development of cost‐effective and flexible electrodes is demanding in the field of energy storage. Herein, flexible Fe_xO_y/nitrogen‐doped carbon films (Fe_xO_y/NC‐MOG) are prepared by facile electrospinning of Fe‐based metal–organic gels (MOGs) followed by high‐temperature carbonization. This approach allows the even mixing of fragile coordination polymers with polyacrylonitrile into flexible films while reserving the structural characteristics of coordination polymers. After thermal treatment, Fe_xO_y/NC‐MOG films possess uniformly distributed Fe_xO_y nanoparticles and larger accessible surface areas than traditional Fe_xO_y‐NC films without MOG. Taking advantage of the unique structure, Fe_xO_y/NC‐MOG exhibits a superior rate performance (449.8 mA h g^?1 at 5000 mA g^–1) and long cycle life (629.3 mA h g^–1 after 500 cycles at 1000 mA g^–1) when used as additive‐free anodes in lithium‐ion batteries.     

Grain‐Boundary “Patches” by In Situ Conversion to Enhance Perovskite Solar Cells Stability

The power conversion efficiency of organic–inorganic hybrid perovskite solar cells has increased rapidly, but the device stability remains a big challenge. Previous studies show the grain boundary (GB) can facilitate ion migration and initiate device degradation. Herein, methimazole (MMI) is employed for the first time to construct a surface “patch” by in situ converting residual PbI₂ at GBs. The resultant MMI–PbI₂ complex can effectively suppress ion migration and inhibit diffusion of the metal electrodes. The origin of the surface “patch” effect and their working mechanisms are investigated experimentally and theoretically at the microscopic level. It hence demonstrates a simple and effective method to prolong the device stability in the context of GB engineering, which could be extensively applied to perovskite‐based optoelectronics.     

民营企业设备管理之吾见

笔者增经在不同的民营企业工作过,深知民营企业随着市场经济的发展,企业的利润由暴利逐渐转向微利.     

提高传感器输出特性线性化的神经网络方法

采用BP神经网络结构和LM网络学习规则对传感器系统的非线性误差进行线性校正和补偿,并对网络结构进行了适当的改进.用Matlab语言实现,计算比较了使用两种不同初始化规则和网络结构时对网络性能的影响.计算机仿真实验表明使用NW初始化规则并改进网络结构后,网络的收敛速度更快,拟合精度也有所改善.     

动目标显示雷达模拟器地物回波单元的设计和实现

在分析了地物杂波回波特性的基础上,首先设计了动目标显示雷达模拟器的地物回波形成单元的组成方框图.结合方框图,得出了形成地物回波的基本要素:同步计数电路、计数比较电路、多普勒调制电路.最后结合雷达自身的特点,设计了动目标显示雷达模拟训练器地物回波形成单元的基本组成电路,并将其与雷达联机,取得良好的效果.     

基于发送缓存的VideoStream调度算法研究及其FPGA实现

研究了 CDMA2000 1x EVDO 系统一种支持 VideoStream 业务的调度算法及 FPGA 实现;通过大量研究和设计,得到一种能保证性能和速度,叉适合硬件实现的调度算法。综合时选用 Altera 公司的 StratixⅡ系列 EP2S60F484C4芯片,并通过功能仿真验证了硬件实现的可行性和正确性。     

厦门海底隧道帷幕降水工程信息化施工技术

信息化管理和动态施工是地下工程建设的发展方向.文章主要介绍了厦门海底隧道穿越浅滩富水砾砂层区段帷幕降水工程的信息化动态施工技术和相关经验,并对施工中遇到的问题和降水效果进行了分析评价.进而探讨了在设计方案的实施过程中,如何通过采集、分析施工反馈数据,有效应对复杂地层条件下的地质勘察局限性风险,并根据反馈信息判别实际地层条件,对设计方案做出动态调整和完善,以达到控制工程风险、降低工程造价的目的.     

Multi-Receiver Signcryption Scheme with Multiple Key Generation Centers through Public Channel in Edge Computing

The emerging edge computing technology for the Internet of Things has been playing an important role in our daily life. It is promising to utilize a multi-receiver signcryption scheme to protect the transmission data when an edge device broadcasts its sensing data to many different end devices at a time.There are several things to consider when we design a signcryption scheme. First existing schemes need to maintain a secure channel to generate the user private key, which may increase economic c...     

基于精细积分的(最优)控制系统设计程序包

在精细积分算法体系的基础上开发的"精细积分(最优)控制系统设计程序包PIM-CSD(Precise Integration Method-Control System Design)",不但具有高效、精确、稳定的优点,可替代Matlab控制工具箱定常控制器设计功能,而且很容易实现时变控制器功能的扩展.主要讲述精细积分程序包在LQ最优控制、Kalman滤波以及系统仿真等控制系统设计基本内容方面的功能实现,特别强调在时变控制器和滤波器的设计以及Kalman滤波微分方程的高效求解等新功能的扩展,通过与Matlab控制系统工具箱中相关功能的比较,显示出PIM-CSD在计算效率、数值精度、算法稳定性等方面的优势.最后,探讨了PIM-CSD的应用领域和发展方向.