电永磁吸盘及其应用的研究

机械制造业中采用磁力吸盘吸合铁磁性材料作业存在着耗能大、不安全等问题,采用电永磁吸盘是较为理想的节能、可靠的方法。     

热力学可逆电池的设计

热力学可逆电池的设计是物理化学中电化学部分的一个重要内容,同时又是一个难点内容,而关于热力学可逆电池的设计,在目前已经出版的各种物理化学教材和电化学教材中,尚未有详尽和系统的介绍,该文则着重对热力学可逆电池的设计进行详尽和系统的介绍。     

关于可逆矩阵求逆方法的几点注记

本文较系统地介绍了通常教材上未详及的几种可逆矩阵求逆的方法,尤其对形如P=■的分块矩阵,加以限制条件:“A、B、X=A-CB~(-1)D及Y=B-DA~(-1)C同时可逆”后,得到用分块矩阵计算P~(-1)的公式即“降阶法’求逆公式: P~(-1)=■~(-1)=■使求逆的计算降阶而得以简化。     

可逆调和映照与最小曲面

研究单叶调和函数的逆映照的调和性．首先给出一个充分必要条件用于判别一个单叶调和函数的逆映照是ρ调和的,然后借此得到（π,（｜h＇｜＋｜g’｜）^2）可逆调和映照的解,最后获得判别由单叶调和函数提升的最小曲面是一平面的一个新条件．     

面向空间通信不平等差错保护的联合信源信道编解码方法

提出了一种面向空间通信不平等差错保护的联合信源信道编解码方法. 该方法采用一种可逆编解码方法对直流系数进行重点保护,即对直流系数编码输出码流进行二进制游程编码,并采用可逆变长码对游程长度进行编码. 对重要性较低的交流(AC)系数采用可变长编解码. 仿真实验结果和分析表明,该方法有效地解决了错误扩散,提高了直流系数的抗差错性能,改善了图像传输质量.     

Cell-like-carbon-micro-spheres for robust potassium anode

Large-scale low-cost synthesis methods for potassium ion battery (PIB) anodes with long cycle life and high capacity have remained challenging. Here, inspired by the structure of a biological cell, biomimetic carbon cells (BCCs) were synthesized and used as PIB anodes. The protruding carbon nanotubes across the BCC wall mimicked the ion-transporting channels present in the cell membrane, and enhanced the rate performance of PIBs. In addition, the robust carbon shell of the BCC could protect its overall structure, and the open space inside the BCC could accommodate the volume changes caused by K⁺ insertion, which greatly improved the stability of PIBs. For the first time, a stable solid electrolyte interphase layer is formed on the surface of amorphous carbon. Collectively, the unique structural characteristics of the BCCs resulted in PIBs that showed a high reversible capacity (302 mAh g⁻¹ at 100 mA g⁻¹ and 248 mAh g⁻¹ at 500 mA g⁻¹), excellent cycle stability (reversible capacity of 226 mAh g⁻¹ after 2100 cycles and a continuous running time of more than 15 months at a current density of 100 mA g⁻¹), and an excellent rate performance (160 mAh g⁻¹ at 1 A g⁻¹). This study represents a new strategy for boosting battery performance, and could pave the way for the next generation of battery-powered applications.     

废旧物品自制热力学演示实验装置的设计

用简单废旧物品设计制作实现准静态绝热过程的实验装置,并用该实验装置进行实验,实现了理想气体准静态绝热过程。根据实验测得的数据进行计算,得出的结果与教学中推导出的准静态绝热过程方程定义符合。