摘要：A novel design of high-efficiency broadband power amplifier （BPA） with the low-pass bias networkto enhance the efficiency and output power is presented in this paper. Compared with other bias networks, the proposed low-pass bias network shows a smaller baseband impedance, which can reduce the electrical memory effect. While it provides a larger radio frequency （RF） impedance, which can prevent the leakage of the output power from bias network. A BPA with the proposed bias network is designed using commercial GaN device Cree40025F. The designed BPA shows a fractional bandwidth of 40%, from 1.8 GHz to 2.7 GHz. The measured results exhibit 73.9 % drain efficiency （DE） value with output power of 43.5 dBm at 2.7 GHz, which appears an enhancement of 9.5% and 2.5 dBm comparing with that adopts LC bias network.

摘要：为解决铜冶炼厂高温斜烟道发生结瘤堵塞难题,使用数模优化设计软件Fluent对高温斜烟道进行优化设计,并将设计成果应用于某新建铜冶炼厂。生产实践表明,采用全新优化设计的高温斜烟道可避免结瘤堵塞发生,提升了铜熔炼工段的生产作业率。

摘要：为解决水下集群多目标定位问题,提出一种基于多频率信标时延估计的多元阵定位方法,文中首先对多目标定位系统进行总体设计,随后开展了基于4元阵的定位原理研究,并且进行了系统的误差分析、目标测速方法研究;开展了基于Notch数字滤波器的多目标水声信号处理方法,该方法在FPGA嵌入式系统上运行,适合多通道的并行处理。最后通过水布垭湖上试验验证了系统的功能、性能指标。试验数据表明该系统可在4 km范围内对水下多目标进行实时定位跟踪。