鱼塘多节点水质评估系统设计

为解决鱼塘管理系统测量误差大、评估失准等问题，设计了鱼塘多节点水质评估系统，该系统利用遥控手柄控制气动船体运动，利用GPS/BDS双模定位模块对所监测水域进行空间与时间上的准确定位和时间同步，利用水质传感器获取鱼塘的酸碱度、水温及浑浊度，利用模糊分析法对鱼苗生存适宜度进行综合评估，利用WIFI、GPRS、GSM 3种可切换的通讯方式将获取的信息发送至App，测试结果表明，测量相对误差在３％以内，可实现对鱼苗的生存适宜度的综合性评估。     

Impact of the dielectric duty factor on magnetic resonance in Ag-SiO2-Ag magnetic absorber

Magnetic absorber in optical frequency can be fulfilled through metamaterials designing. Therein, magnetic resonance in metal-dielectric-metal metasurfaces can be manipulated conveniently, and studying the parameters impacts is the primary for applications. In this work, through changing the grating width and the thickness of silica, the magnetic resonance modes have been studied, the conditions of the phase change zone from magnetic resonance(MR) to Fabry-Pérot(FP) are given out in Ag-SiO₂-Ag grating magnetic metasurfaces. The results indicate that the MR mode in metal-dielectric-metal configuration is mainly decided on the dielectric duty factor other than the sole behaviors of the thickness of dielectric and size of nanostructures. The physical mechanism is elucidated through simulated electromagnetic field distributions using finite difference time domain(FDTD) solution, and numerical analysis of effective refraction index of Ag-SiO₂-Ag magnetic metasurfaces. This study may prompt development of metamaterials in basic research in condensed physics and in optical devices applications.     

含反馈环的电动飞机驱动系统可靠性分析方法

电动飞机驱动系统由于存在反馈环无法用成功流(GO)法进行可靠性分析,直接断开反馈又降低了分析结果的精度,为此提出一种通过建立布尔方程解决含有反馈环的系统可靠性分析方法.设置反馈信号为系统输入,根据信号流向和GO法操作符运算规则建立含反馈信号的布尔方程,并与其他反馈信号的方程联立求得各反馈信号的表达式,进而获得系统可靠性...     

明清瓷盘边饰中的菊花纹样演变研究

明清时期，菊纹逐渐迈入装饰领域，瓷盘边饰纹样的装饰比重不断增加，它们的碰撞产生了新的艺术氛围。与此同时，随着陶瓷的发展、时代的进步，不断产生了新的样式，其不仅开拓了审美意义，还增添了更多的历史及社会意义。本文将从边饰纹样的视角对菊纹变化、工艺发展以及形式多元三个方面进行探讨。