Lightweight Triboelectric Nanogenerator for Energy Harvesting and Sensing Tiny Mechanical Motion

Triboelectric nanogenerators (TENGs) have shown exciting applications in mechanical energy harvesting and self‐powered sensing. Aiming at commercial applications, cost reduction and simplification of TENG structures are of great interest. In this work, a lightweight TENG based on the integration of polymer nanowires and a carbon sponge, which serves both as the substrate and an electrode, are reported. Because of the low density of the carbon sponge and the filmy nanowires, the device exhibits a total mass of less than 0.1 g for a volume of 12.5 cm³ and it produces a short‐circuit current of 6 μA, open‐circuit voltage of 75 V, and a maximum output power of 0.28 W kg^?1 under light finger tapping. The device can linearly measure the acceleration at a detection limit down to 0.25 m s^?2 and for a detection range from 0.25 m s^?2 to 10.0 m s^?2.     

Highly Efficient Three Primary Color Organic Single‐Crystal Light‐Emitting Devices with Balanced Carrier Injection and Transport

Organic single crystals have a great potential in the field of organic optoelectronics because of their advantages of high carrier mobility and high thermal stability. However, the application of the organic single crystals in light‐emitting devices (OLEDs) has been limited by single‐layered structure with unbalanced carrier injection and transport. Here, fabrication of a multilayered‐structure crystal‐based OLED constitutes a major step toward balanced carrier injection and transport by introducing an anodic buffer layer and electron transport layer into the device structure. Three primary color single‐crystal‐based OLEDs based on the multilayered structure and molecular doping exhibit a maximum luminance and current efficiency of 820 cd cm^?2 and 0.9 cd A^?1, respectively, which are the highest performance to date for organic single‐crystal‐based OLEDs. This work paves the way toward high‐performance organic optoelectronic devices based on the organic single crystals.     

基于自适应卡尔曼滤波的飞机气流角估计研究

迎角、侧滑角是飞机重要的飞行状态参数,而大气数据系统在恶劣天气、大迎角或机动飞行情况下是难以准确测量出气流角等数据的.基于飞行数据,研究了一种飞机气流角的估计方法.考虑到飞行数据可能受到外部干扰发生数据突变、各数据采样频率不同以及飞行数据之间的噪声统计特性均未知等情况,建立飞机系统状态方程和量测方程,将非等间隔理论与基...     

简析济南奥林匹克体育中心体育场扩声系统

尝试对第十一届全运会主会场--济南奥林匹克体育中心体育场扩声系统工程进行分析.针对扩声系统工程设计、设备配置和工程施工、使用效果等方面进行了对比和探讨.希望能够给今后国内大型体育设施扩声系统的建设,起到借鉴和帮助作用.     

硫酸铜镀液镀铜机理概述

概述了硫酸盐镀铜的基本原理以及镀液组分的作用机理,同时给出电镀铜厚与电镀参数之间的依赖关系,对生产有一定的指导意义,希望能为新工艺的开发提供理论依据。     

1.5GHz CMOSECL输入接口的设计与测试

对一种高速CMOS ECL输入接口进行了分析研究,该接口包含一种双镜补偿的CMOS差分放大电路,采用0.18 μm CMOS工艺研制,实现了PECL电平兼容.经测试,该接口最高工作频率达1.5 GHz.     

基于Radon-STFT的DSSS系统线性调频干扰对消

提出一种基于Radon-STFT的DSSS系统线性调频干扰对消算法,仿真实验表明,该方法可以在较大的动态范围内有效地抑制线性调频干扰。与基于STFT的抑制算法相比,其参数估计精度大大提高;与基于WHT的抑制算法相比,该方法在多分量条件下效果更为突出,其运算量也显著降低。     

Maritime cognitive radio spectrum sensing based on multi-antenna cyclostationary feature detection

ABSTRACT

With the development of the maritime transportation industry, the number of ships is increasing and the ships are becoming more intelligent. Due to the rapid development of maritime communication, the demand for communication spectrum is increasing. Therefore, the maritime cognitive radio (CR) system is an effective solution. Because of the multipath fading caused by sea surface and atmosphere has a more serious influence on communication signals, which increases the instability of the signal reception, the spectrum sensing technology in maritime cognitive radio is more challenging than the spectrum sensing on land. In order to solve this problem, a cyclostationary detection algorithm for multiple antennas in fading model is proposed. A maximum ratio combining algorithm based on optimal weight correlation value (OWCV-MRC) is proposed for the diversity gain and system performance degradation caused by diversity technology on multipath fading channels. The algorithm uses the correlation values of the attenuation gains on the two different branches as the weighting coefficients of each branch, thus improving the coefficient matrix in the maximum ratio combining (MRC) algorithm. The simulation results show that the proposed algorithm can effectively detect the target signal in the fading channel with ultra-low signal to noise ratio (SNR).     

新型硅激光器系统的优化设计

通过在硅波导上添加反向偏压的PIN结构,建立了完整的全硅激光器系统.该系统包括半导体泵浦光源和硅波导放大器.建立的硅激光器增益模型,与已知的实验结果达到了很好的一致,并给出了泵浦光源输出波形和硅激光器的输出波形.该系统可以集成在很小的CMOS器件上,实现光电子器件的集成化,有着广泛的应用前景.     

VxWorks在电源监控系统中的应用

在电源监控系统中使用Vxworks作为操作系统，运用WindML等技术实现了对町监控电源的状态监测、数据通信、信息图形化显示及与外部计算机的通信。简要介绍了监控系统的硬件构成、软件构成和软件中与Vxworks有关的功能模块的实现方法，对于软件实现过程中的与Vxworks有关的一些注意事项进行了说明。实际使用验证了系统的有效性。