Catalytically Induced Robust Inorganic-Rich Cathode Electrolyte Interphase for 4.5 V Li||NCM622 Batteries

Tailoring inorganic components of cathode electrolyte interphase (CEI) and solid electrolyte interphase (SEI) is critical to improving the cycling performance of lithium metal batteries. However, it is challenging due to complicated electrolyte reactions on cathode/anode surfaces. Herein, the species and inorganic component content of the CEI/SEI is enriched with an objectively gradient distribution through employing pentafluorophenyl 4-nitrobenzenesulfonate (PFBNBS) as electrolyte additive guided by engineering bond order with functional groups. In addition, a catalytic effect of LiNi_0.6Mn_0.2Co_0.2O₂ (NCM622) cathode is proposed on the decomposition of PFBNBS. PFBNBS with lower highest occupied molecular orbital can be preferentially oxidized on the NCM622 surface with the help of the catalytic effect to induce an inorganic-rich CEI for superior electrochemical performance at high voltage. Moreover, PFBNBS can be reduced on the Li surface due to its lower lowest unoccupied molecular orbital , increasing inorganic moieties in SEI for inhibiting Li dendrite generation. Thus, 4.5 V Li||NCM622 batteries with such electrolyte can retain 70.4% of initial capacity after 500 cycles at 0.2 C, which is attributed to the protective effect of the excellent CEI on NCM622 and the inhibitory effect of its derived CEI/SEI on continuous electrolyte decomposition.     

C-Shaped Cartilage Development Using Wharton's Jelly-Derived Hydrogels to Assemble a Highly Biomimetic Neotrachea for use in Circumferential Tracheal Reconstruction

A highly biomimetic neotrachea with C-shaped cartilage rings has promising clinical applications in the treatment of circumferential tracheal defects (CTDs) owing to its structure and physiological function. However, to date, most fabricated tracheal cartilages are O-shaped. In this study, finite element analysis demonstrates C-shaped cartilage rings that exhibit better compliance than O-shaped. Hydrogel is developed using methacryloyl-modified decellularized Wharton's jelly matrix (DWJMA) for the regeneration of C-shaped cartilage rings. This novel hydrogel possesses adjustable physicochemical properties and favorable cytocompatibility. When loaded with chondrocytes, DWJMA hydrogels support the optimal cartilage regeneration both in vitro and in vivo. More importantly, a highly biomimetic neotrachea simultaneously simulating the structural and physiological properties of the normal trachea is regenerated via modular assembly of several individual C-shaped cartilage rings. The results demonstrate the highly biomimetic neotrachea have better patency (88.6 ± 6.1% vs 74.4 ± 9.4%, p < 0.05), improve the survival rate, alleviate weight loss and mucoid impaction, than its O-shaped counterpart when used for the treatment of CTDs in a rabbit model. Therefore, this study proposes a novel hydrogel for the regeneration of C-shaped cartilage and provides new insights into the treatment of CTDs using a highly biomimetic neotrachea with C-shaped cartilage rings.     

Mechanical and Reaction Properties of Al/TiH2/PTFE under Quasi‐Static Compression

TiH₂ is introduced into Al/PTFE reaction system for the first time. In order to study the mechanical and reaction properties of Al/TiH₂/PTFE composites, five kinds of mixtures with different TiH₂ contents and the contrasting TiH₂/PTFE mixture are prepared. The true stress–strain curves and reaction phenomena are recorded during the quasi‐static compression experiments; The reaction residues are analyzed with XRD to understand the reaction mechanism. The results show that the introduction of TiH₂ can significantly influence the strength of the composites; With the increasing of TiH₂ content, the mechanical strength is firstly increase and then decrease; When the content is the same, the reinforcing effect of TiH₂ particles on PTFE matrix is greater than that of Al. Violent reaction are observed in the four Al/TiH₂/PTFE composites with the content of TiH₂ below 20%, but not in TiH₂/PTFE. Furthermore, compared with Al/PTFE material, special flames are found during the reaction of composites with TiH₂, which become even more obvious with the increasing of TiH₂ content. The material reaction mechanism denotes that the high temperature of the crack tip result in the reaction of Al and PTFE, which activates TiH₂ to release hydrogen and generate TiC, resulting TiH₂ to fully release its energy.

     

多步热处理对未掺杂LEC SI-GaAs特性的影响

对未掺杂ＬＥＣＳＩ－ＧａＡｓ进行了“三步热处理”。用霍尔测量、光激电流谱测量和化学腐蚀方法研究了这种热处理对电阻率、迁移率、电活性缺陷、位错密度及Ａｓ沉淀的影响。     

基于变换矩阵的三维重建算法研究

先对传统明暗恢复形状(Shape From Shading)算法进行简单分析,然后提出了一种改进的SFS算法.在图像亮度与反射图函数的差值采用雅可比迭代方法的基础上,改进变换矩阵,使其特征值包含三个平方项,减少了矩阵的结果无效的情形,并且提高了迭代的收敛速度.针对光照条件不好的图像,提出了一种先旋转坐标轴,后双向重建的算法.通过旋转坐标轴一定角度,改变光源方向,减少图像失真,然后双向重建的两幅图像通过加权平均法得到物体的三维重建图.最后,用Matlab编制相应程序,在计算机上进行仿真.实验结果表明,改进的SFS算法是有效的,能够克服传统SFS算法精度低的缺陷,提高了三维重建的稳定性和精确度,缩短了三维重建的时间.     

具有人机交互接口的家庭安全报警系统设计

针对市场上各类家庭报警系统没有为用户提供人机交互接口的弊端,在传统报警系统的基础上对其功能进行了有意义的扩展,既实现了对非法侵入、火灾、煤气泄漏等各类家庭紧急情况的及时报警,又为用户提供了人机交互功能,解决了用户不能自行修改报警号码的问题,使整个系统设计更加人性化.给出了整个系统的硬件结构框图和软件设计流程图.     

基于铱星的浮标远程监测与数据传输系统

针对海洋定点垂直剖面监测系统,设计并实现了一种基于铱星的浮标远程监测与数据传输系统。它主要由带有WINCE5.0操作系统的AT91SAM9G20主控板和铱星通信终端组成。为了降低系统功耗以达到长期无人值守监测要求,采用基于STC12C5A60S2的浮标状态监测板代替主控板监测浮标、锚灯和电池的状态。三者通过串口通信实现数据的传输。     

支持B类CPU卡的5V接触式读写器设计

针对A类接口的读写器不能对B类CPU卡进行读写的问题,介绍一种可以对3V的B类卡片进行读写的5V接触式IC卡读写器,阐述了其硬件电路结构和单片机固件程序,介绍了对其进行操作的简单上位机软件。实验结果表明,该读写器结构简单、性能稳定,对研制可同时操作3V/5V卡片的AB类接口设备有指导意义。