In Situ Artificial Hybrid SEI Layer Enabled High-Performance Prelithiated SiOx Anode for Lithium-Ion Batteries

Considered the promising anode material for next-generation high-energy lithium-ion batteries, SiO_x has been slow to commercialize due to its low initial Coulombic efficiency (ICE) and unstable solid electrolyte interface (SEI) layer, which leads to reduced full-cell energy density, short cycling lives, and poor rate performance. Herein, a novel strategy is proposed to in situ construct an artificial hybrid SEI layer consisting of LiF and Li₃Sb on a prelithiated SiO_x anode via spontaneous chemical reaction with SbF₃. In addition to the increasing ICE (94.5%), the preformed artificial SEI layer with long-term cycle stability and enhanced Li⁺ transport capability enables a remarkable improvement in capacity retention and rate capability for modified SiO_x. Furthermore, the full cell using Li(Ni_0.8Co_0.1Mn_0.1)O₂ and a pre-treated anode exhibits high ICE (86.0%) and capacity retention (86.6%) after 100 cycles at 0.5 C. This study provides a fresh insight into how to obtain stable interface on a prelithiated SiO_x anode for high energy and long lifespan lithium-ion batteries.     

Bioinspired Intervertebral Disc with Multidirectional Stiffness Prepared via Multimaterial Additive Manufacturing

Degenerative disc disease (DDD) has become a significant public health issue worldwide. This can result in loss of spinal function affecting patient health and quality of life. Artificial total disc replacement (A-TDR) is an effective approach for treating symptomatic DDD that compensates for lost functionality and helps patients perform daily activities. However, because current A-TDR devices lack the unique structure and material characteristics of natural intervertebral discs (IVDs), they fail to replicate the multidirectional stiffness needed to match physiological motions and characterize anisotropic behavior. It is still unclear how the multidirectional stiffness of the disc is affected by structural parameters and material characteristics. Herein, a bioinspired intervertebral disc (BIVD-L) based on a representative human lumbar segment is developed. The proposed BIVD-L reproduces the multidirectional stiffness needed for the most common physiological kinematic behaviors. The results demonstrate that the multidirectional stiffness of the BIVD-L can be regulated by structural and material parameters. The results of this research deepen knowledge of the biomechanical behavior of the human lumbar disc and may provide new inspirations for the design and fabrication of A-TDR devices for both engineering and functional applications.     

仿晶体生长快速算法用于加速2D 静磁场设计中的参量扫描

为了加速二维静磁场设计中参量扫描的速度,本文提出仿晶体生长快速算法：网格空间不变,结构在网格空间中微动,利用前一次计算出来的结果,构造新的初解,以提高下一次有限差分法计算矢量磁位的迭代速率。该方法可以将扫描时间平均减少一半以上,并且计算结果与普通计算结果偏离很小。与同类软件相比,采用该方法的参量扫描和优化过程速度更快,也有潜力应用于其他复杂结构的优化过程。     

物联网通信中的无线信道抗干扰算法

在物联网通信中,无线信道的抗干扰性依然受到各种因素影响,多天线系统对信道质量改善有较好的效果,但其信号检测的复杂度和性能还需要进一步提升。基于 QR 分解的检测算法具有较低的计算复杂度,但检测性能有待改善。为了改善QR分解检测算法的性能,提出一种基于ML准则结合判决候选机制的QR分解算法,并对其性能进行了分析。该算法采用 ML 准则对初始层进行精确估计检测,而后对其他检测层进行可靠判决,不可靠则引入候选点并从中选择最优候选点进行反馈。该算法可以显著改善系统干扰,并且在判决回馈中大大减少错误传播。实验仿真表明,在增加一定复杂度的情况下,该算法能够有效改善物联网系统性能。     

AGM隔膜对VRLA电池性能的影响

介绍了超细玻璃纤维隔膜（AGM）的基本性能以及不同厂家AGM隔膜在相同的极板和装配压力等情况下对所装配电池初期容量、电解液分层情况、密封反应效率、电池循环寿命等的影响。     

银键合丝力学性能对键合质量的影响

通过调节微合金元素的含量获得3种具有不同力学性能的银键合丝.利用拉伸试验、键合试验、焊线挑断力、焊球推力测试等手段,研究了银键合丝力学性能对键合质量的影响.结果表明,在延伸率相同的条件下,随着微合金元素含量的降低,3种键合丝的断裂负荷降低,初始模量先减小后增大,键合后焊线挑断力和焊球推力均降低,电极金挤出率先减小后增大.银键合丝初始模量较低时在超声和压力的作用下易于变形,焊线内残余应力较低且第二焊点与引线框架结合较好,因此挑断测试时第二焊点与框架材料界面处不易发生脱离,有利于获得更高的键合成功率.     

Identification of rod dynamics under influence of Active Magnetic Bearing

The purpose of this paper is to apply the wavelet transform algorithm to identify the magnetic damping and magnetic stiffness coefficients of the drive rod with which a set of 4-pole Active Magnetic Bearing (AMB) is equipped. By taking advantage of time–frequency analysis feature, the ridge curve of rod free response after wavelet transformation can be extracted to find the natural frequency of the rod/AMB system. In other words, due to the influence of magnetized field by the AMB, the stiffness of the rod dynamics is not linear any more and can be estimated from the curve of the amplitude versus frequency by wavelet transformation. On the other hand, the nonlinear damping coefficients can be estimated from the derivative of amplitude versus amplitude by wavelet transformation of rod free vibration. It is found that the nonlinear magnetic damping coefficients are up to 2nd-order in polynomial and the stiffness coefficient is mainly of 3rd-order respectively. In addition, the identified 2nd-order damping coefficient is negative and hence implies that under specific rod displacement and speed, the dynamic of the rod/AMB system in axial direction is unstable.     

一种高分辨率电容微加速度计的设计研究

分析了影响加速度计分辨率的因素,在此基础上,通过采用深度反应离子刻蚀工艺获得大的敏感质量和小的电极间隙、采用电容变化量比枝齿梳状敏感结构大一倍的直齿梳状敏感结构和利用静电负刚度来降低结构的刚度等措施提高器件分辨率。最后给出了一种新的设计方案,叙述了其工作原理并分析了影响其闭环灵敏度的因素。     

特种物品储运记录仪的设计与研究

特殊物品储运记录仪是能够对车辆行驶速度、路线进行记录存储,并通过惯性器件自主导航的智能装置。以往的储运设备只能粗略记录物品受冲击力的状况,针对这一问题,提出一种基于惯性导航系统的储运记录仪。实验结果表明,设计的基于MEMS器件的捷联式惯性导航系统能够输出满足要求的载体瞬时速度、加速度、姿态、位置等,可以明显加强危险品、敏感材料的运输监控力度。     

多尺度变换和粒子群优化的图像融合方法

在图像融合领域,基于多尺度变换的图像融合方法是研究的热点,文中提出了一种基于多尺度变换和粒子群优化的图像融合方法,对基于多尺度变换得到的融合图像,利用粒子群优化进行进一步处理,并讨论了优化算法中初始图像质量对最终结果的影响。实验结果表明,该算法具有较好的融合结果,且优化时选取偏差大的初始图像粒子,能够获得更好的融合结果。