基体合金对B4C/Al复合材料力学及抗弹性能的影响

为研究基体合金对B4C/Al复合材料力学性能及抗弹性能的影响,选择强度、硬度和塑性各不相同的5083Al、2024Al和7075Al铝合金为基体合金,采用压力浸渗工艺制备B4C颗粒增强体积分数为55%的B4C/5083Al、B4C/2024Al和B4C/7075Al复合材料,并对其进行力学性能和抗弹性能测试。结果表明:3种B4C/Al复合材料的力学性能特征与基体铝合金相对应,B4C/7075Al复合材料的强度和硬度最高,抗侵彻能力最好,侵彻深度为15.7 mm,防护系数为4.13;B4C/5083Al复合材料的塑性最好,其靶板整体能力最好。     

电能无线传输装置的补偿电路研究

介绍了基于电磁感应无线电能传输方式的主电路拓扑结构和工作原理。并对该传输方式的补偿电路进行了比较分析。搭建了仿真对补偿电路进行的比较和分析,最终给出了各自的使用场合。     

BBO晶体Ⅰ型非共线相位匹配参量放大研究

理论研究了BBO晶体在Ⅰ型相位匹配下非共线情况时的激光参量放大特性。研究结果表明 ,对于一定波长的抽运光 ,存在一定的非共线入射角对应一定波长的信号光 ,使在较高的激光增益下增益带宽最大 ,同时温度的调谐也对增益谱的形状有部分影响。这对于短激光脉冲的激光参量放大的优化具有重要意义。     

半导体激光器退化及其筛选

文章概述了半导体激光器失效因素，退化行为及改进可靠性的措施，特别就可靠性问题进行了讨论，指出用电导数参数对半导体激光器进行可靠性筛选和评估是一个行之有效的办法。     

Stretchable Anti-Fogging Tapes for Diverse Transparent Materials

Surface wetting prevents surface fogging on transparent materials by facilitating filmwise condensation with specific chemistry, but suffers from material and geometry selectivity. Extreme environments associated with high humidity and mechanical loading further limit their anti-fogging persistence. Here, a stretchable anti-fogging tape (SAT) that can be applied to diverse transparent materials with varied curvatures for persistent fogging prevention is reported. The SAT consists of three synergistically combined transparent layers: i) a stretchable and tough layer with large elastic recovery, ii) an endurant anti-fogging layer insensitive to ambient humidity, and iii) a robustly and reversibly adhesive layer. The SAT maintains high total transmittance (>90%) and low diffuse transmittance (<5%) in high-humidity environments, under various modes of mechanical deformations, and over a prolonged lifetime (193 days tested so far). Two applications are demonstrated, including the SAT-adhered eyeglasses and goggles for clear fog-free vision, and the SAT-adhered condensation cover for efficient solar-powered freshwater production.     

飞秒激光多脉冲烧蚀研究进展

由于飞秒脉冲在烧蚀固体材料时的独特机制，在材料激光微加工方面有其突出的优点，表现出极大的应用潜力。本文主要就国内外多脉冲飞秒烧蚀研究的进展作一简介，包括多脉冲烧蚀的特点，现有的烧蚀机制分析及其应用前景等。     

Effects of annealing on the electric noise in semiconductor lasers

Thirty high-power quantum well semiconductor lasers of 808 nm wavelengths are aged at 18 ± 2 °C and 0.5 A. By measuring the variety of device noise before and after aging, it is found that the noise decreases after aging for 100 and 1000 h; moreover, the noise decreasing range of the failed device after aging is obviously higher than that of the good device. In addition, the noise characteristics of the failure device have some change, and the g–r noise occurs after aging. The investigation shows that it is due to the different behavior of the different kinds of defects during annealing.     

一种紧凑型微带三频滤波器的设计

提出了一种新型微带三频滤波器,滤波器由两个弯折并相互嵌套的分支线谐振器和一个T形谐振器组成。谐振器之间相互耦合,得到三通带频率响应特性。该滤波器可通过调节微带线几何参数改变通带位置以及带宽,以满足不同应用需求。这种结构的滤波器结构紧凑,电路面积小,三个通带两边各引入一个传输零点,增强了通带间的隔离度以及阻带抑制特性。设计并制作了一款1.57/3.55/5.2GHz三通带滤波器,测试结果与仿真结果基本相符,验证了该滤波器结构的有效性。     

基于物联网技术的柔性管道巡检机器人

介绍了一种基于“物联网传感器”技术,具有强大信息传输功能的智能管道巡检机器人。该型智能管道巡检机器人主要运用于建筑领域,为施工过程中的“管道布设”、“基坑监测”及“重点管线巡查”提供硬件支持。该型机器人集“智能数据采集”、“智能数据分析”、“智能管内巡检”等功能于一身,能够满足全天候值守巡检的要求。同时,应用 “总线设计”及“模块化设计”的思路,使该型检测设备能够与各种类型的专用传感系统进行结合,方便检测人员根据现场的实际需求,随时组装出具有相应功能的管道巡检机器人。     

Analytical model of a superluminescent diode

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