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.     

基于规则引擎的自动运维虚拟器件模型

云计算的普及离不开虚拟化技术的支撑,虚拟化技术的广泛应用给众多企业数据中心带来了极大的好处.其中虚拟器件软件形态的发展,加速了大型软件开发和部署流程,但是在虚拟器件的管理维护阶段对用户来说存在一定困难.本文针对虚拟器件的运维管理对现在虚拟器件模型进行了扩展,提出了基于规则引擎的自动运维虚拟器件模型,并且设计了一个实现方案进行验证.     

FR-4基材高导热印制板的研制

介绍一款用FR-4基材,结合导热胶,制作高导热印制电路板的方式。这款印制板既解决了客户要求导热系数高,又成本低廉、可靠性好,还可以代替高成本的金属基印制板。同时在制作方式上,还能利用原来生产设备,生产工艺也可不作大的调整,能够快速导入批量生产。     

Design of hexagonal filter with source-load coupling

A method for synthesising a novel hexagonal filter with source-load coupling is presented. The equivalent circuit of the lowpass prototype of a general lossless coupled resonator filter is proposed, and the corresponding transfer function t(s) is derived. A novel quasi-elliptic function microstrip hexagonal filter is designed and fabricated. Simulated and measured results are presented. Compared with the conventional cross-coupling filter, the proposed hexagonal filter acquires more than 27.5% size reduction and provides improved selectivity by a relatively small bandwidth     

美国船舶电台管理模式简介

为确保水上无线电通信安全,我国应加强对船舶电台的管理。本文以美国FCC为例,介绍了发达国家中较具代表性的船舶电台管理模式。     

基于扰动搜索属性约简的装备故障诊断研究

为提高装备故障诊断效率,提出了一种新的粗糙集属性约简方法.首先将属性约简问题转化为集合覆盖问题,在相关矩阵的基础上构建相关系数矩阵;然后基于优质特征集选取原则,引入随机变异机制,设计扰动搜索算法,求出属性约简结果;最后,用UCI数据集和某型复杂装备电源系统进行验证.仿真结果表明,在满足分类精度要求的基础上,有效剔除了冗余属性,缩短了故障诊断时间.     

3D Graphene Films Enable Simultaneously High Sensitivity and Large Stretchability for Strain Sensors

Integration of 2D membranes into 3D macroscopic structures is essential to overcome the intrinsically low stretchability of graphene for the applications in flexible and wearable electronics. Herein, the synthesis of 3D graphene films (3D‐GFs) using chemical vapor deposition (CVD) is reported, in which a porous copper foil (PCF) is chosen as a template in the atmospheric‐pressure CVD preparation. When the 3D‐GF prepared at 1000 °C (noted as 3D‐GF‐1000) is transferred onto a polydimethylsiloxane (PDMS) membrane, the obtained 3D‐GF‐1000/PDMS hybrid film shows an electrical conductivity of 11.6 S cm^?1 with good flexibility, indicated by small relative resistance changes (ΔR/R₀) of 2.67 and 0.36 under a tensile strain of 50% and a bending radius of 1.6 mm, respectively. When the CVD temperature is reduced to 900 °C (generating a sample noted as 3D‐GF‐900), the 3D‐GF‐900/PDMS hybrid film exhibits an excellent strain‐sensing performance with a workable strain range of up to 187% and simultaneously a gauge factor of up to ≈1500. The 3D‐GF‐900/PDMS also shows a remarkable durability in resistance in repeated 5000 stretching‐releasing cycles. Kinetics studies show that the response of ΔR/R₀ upon strain is related to the graphitization and conductivity of 3D‐GF which are sensitive to the CVD preparation temperature.     

用于微细圆弧加工的激光刻录机

声盘、视及光的亚微米圆弧线一般通过激光刻录机光刻制造，本文结合我国开发的用于磁盘伺服图形录写的激光刻录机，从机械结构、光路系统及计算机控制系统等方面，对其进行了研究分析。     

电力线载波通信电磁辐射和OFDM调制技术的研究

介绍了PLC电磁辐射产生的原因、影响因素和抑制措施,电磁辐射可通过OFDM调制技术灵活的选择载波频率得到抑制。对OFDM调制技术的原理进行分析,建立数学模型,并介绍了OFDM技术的应用优势。     

一种全方位防过电流和过电压的DSL保护电路

针对当前DSL接口保护电路无法满足GR-1089-CORE中AC Power Fault测试要求的问题,提出了一种采用通信用保险丝（FUSE）＋气体放电管（GDT）组合的新型全方位防过电流和过电压的DSL保护电路,实验结果表明,该新型方案技术可行且有效。