在进行亥姆霍兹线圈磁场测量实验的过程中,基于现有实验装置不具有屏蔽外界干扰、测量磁场和数据处理一体化功能的问题,实验不可避免地要分开、独立在两个实验室内进行,极大地降低了学习效率,浪费了教学资源.鉴于此,设计了一个方案将原本需要在两个实验室的不同测量装置上完成的实验集于一体得以实现.利用了探测部件、机械手臂的集成、磁场空间的拓展去实现对原有实验室磁场测量设备的一次改良和创新,它可以使本科生更加便利、更有效率地进行磁场测量的实验,以达到测量方法精细化、信息体现一体化、数据处理便捷化的目的并能节约教学资源.

根据地学仪器专业的实践教学特点,将自制科研仪器核磁共振找水系统JLMRS应用于地学仪器认识实习.根据核磁共振找水系统的工作原理和使用方法设计野外实验,介绍了数据处理的基本流程和简单的反演成像算法.基于核磁共振找水系统的地学仪器认识实习使本科生能够了解到最前沿的科研仪器设备,开拓了本科生的视野,激发了本科生对地学仪器专业的学习热情,有利于研究型和创新型人才培养.

荣誉计划是培养拔尖创新人才、提高人才培养质量的重要途径."电磁场与电磁波"是国内外电气工程和仪器仪表等仪器类专业学习计划中最重要的基础课程之一.本文通过深入分析课程特点,以专题形式优化整合了教学内容,开展了"研讨+项目驱动式"教学方法改革,设计了与丹麦科技大学磁共振研究中心展开电磁场理论应用的中外联合教学环节,开拓了学生主动探索的求知精神、拓展了学生的国际化视野.本文将对"电磁场与电磁波"荣誉课程教学内容、教学方法和学习评价等方面进行系统研究,以期为其它荣誉课程设计及一流建设课程国际化联合教学提供理论基础和科学依据.

大地电磁信号具有信号弱、频带宽的特点,野外获取的电磁数据质量极易受强人文干扰而下降.为提高采集数据的信噪比,需要采取合理的去噪方法对数据进行降噪处理,为此,采用小波变换方法有效压制部分人文噪声.小波变换具有"时频"联合分析的功能,可以对信号进行多尺度细化分析,非常适合处理频率成分复杂的大地电磁数据.通过对小波变换原理进行分析,结合野外电磁数据的信号与噪声特点,选择合理的母小波、分解层数、阈值等小波变换参数,针对不同的人文噪声干扰采用不同的参数组合进行处理.实验结果表明,野外电磁数据经过小波变换去噪后信噪比有效提升,为后续视电阻率计算提供了高质量的时间序列.

We report an approach of preparing dispersive CuCo2O4 nanoparticles completely encapsulated by onion-like carbon (OLC) layers. The CuCo2O4/OLC nanocapsules are prepared by the arc discharge method and the following air annealed process. As an anode for lithium ion batteries (LIBs), the discharge capacity of this nanocapsules is 743.2mAhg−1 at a current of 0.2Ag−1 after 300 cycles. The discharge can also retain 539.6mAhg−1 at a high current of 5.0Ag−1. The high cycling stability and rate capability result from the nanocapsules combining the advantages of CuCo2O4 nanoparticles and OLC shells. The CuCo2O4 nanoparticles provide sufficient contact with the electrolyte and rapid three-dimensional Li+ diffusion channels; OLC improves the conductivity and the structural stability of CuCo2O4 nanoparticles. The CuCo2O4/OLC nanocapsules with the high electrochemical performance would have the potential for applications in LIBs with long cycling life and high power density.

Ternary FeNi@C@polyaniline (PANI) nanocomposites, in which FeNi@C nanocapsules are surrounded by PANI, are synthesized by combining the arc-discharge process and an in situ chemical oxidative polymerization reaction. The strong interactions between the carbon shell and PANI result in the blue shift of the Raman spectrum. The effect of PANI on the electromagnetic properties of the FeNi@C nanocapsules is investigated at 2-18 GHz. The bandwidth (reflection loss (RL) < -10 dB) of the FeNi@C@PANI nanocomposites keeps constant at 3.0 GHz, but the frequency range (RL < -10 dB) shifts to a lower frequency with increasing thickness from 1.7 to 3.0 mm. For a thickness of 1.4 mm, the bandwidth of the FeNi@C@PANI nanocomposites reaches a maximum value of 5 GHz (13-18 GHz). For the FeNi@C@PANI nanocomposites, a minimum RL (RLmin) of -49.2 dB is observed at 16.6 GHz for a thickness of 1.3 mm. The RLmin of the FeNi@C@PANI nanocomposites is larger than that of the FeNi@C nanocapsules and the RLmin shifts from low to high frequency under the same absorbing thickness. The FeNi@C@PANI nanocomposite can be seen as a good candidate for lightweight, thin and strongly absorptive microwave absorbents with a broad bandwidth.

In this work, we have reported the preparation and lightweight and thin microwave absorbent application of ultrasmall Ni nanoparticles embedded in polyaniline (PANI).