MAX275在电力线载波技术中的应用

为提高电力线载波传输的抗干扰能力,本文利用切比雪夫双峰带通滤波器带通到带阻的衰减特性,在电力线载波传输的接收端基于MAX275设计了一套滤放电路,重点介绍了MAX275的工作原理,信号提取与滤放电路设计,外部参数选择等。     

S 波段20kW 平均功率正交场放大器研究

针对S 波段长脉宽、大工作比正交场放大器应用需求,仿真优化了短管支撑曲折线慢波结构的色散及耦合阻抗特性,提出了输能结构改进方案,对高频系统进行了优化设计,仿真结果与冷测结果具有较好一致性,冷测结果表明,该设计实现了高频系统的宽频带及高效率。首次采用99.5% 细晶氧化铝陶瓷作为控制极与阴极间绝缘介质,解决了绝缘组件大平均电流下击穿问题。首次采用固态放大器和二级正交场放大器搭建了三级放大链测试系统,实现了S 波段正交场放大器大工作比测试,热测结果表明,在脉冲宽度300μs、工作比8% 条件下,该放大器在300 MHz 带宽内脉冲功率大于250 kW,平均功率大于20 kW,全带宽内效率大于52%,该放大器使S 波段大功率正交场放大器技术水平迈上了新台阶,也是当前国际上脉冲宽度最宽、工作比最大的正交场放大器产品。     

一种X 频段100kW 液冷谐波滤波器设计

大功率速调管发射机除产生所需主频功率外,还产生大量不需要的谐波功率,为防止发射机谐波干扰其它电子设备,通常在发射馈线系统中插入谐波滤波器。在对比分析了国内外微波滤波器现状的基础上,对超高功率微波滤波器的机理进行了分析和研究,针对X 频段100 kW 谐波滤波器重点研究了滤波器的冷挤压成形技术、高密度散热技术和热仿真技术等关键技术,通过仿真设计和反复试验,研制出一套X 频段100kW 谐波滤波器。经过测试和上机验证,完全满足技术指标要求,达到了研究目的。     

GYT 282-2014标准在电台制作中的探索与实践

剖析了满度电平标准在音频制作中存在的局限性,参照新颁布的GY/T 282-2014数字音频标准,同时结合笔者在广播音频制作中的探索、实践体会,阐述了新标准在音频制播中的优势,以及在不同类型广播节目间的实施区别.最后,详细介绍了在电台节目制作中,借用Audition CS6进行响度控制操作的具体实施要点.     

Optimal capacitor placement in radial distribution system using Gravitational Search Algorithm

Power generated in generating station is transmitted through transmission lines and fed to the consumers through distribution substation. The power distributed into the network has losses, which is greater in distribution system compared to transmission system. This problem could be addressed by placing capacitor at strategic location due to which the kW loss can be minimized and the net savings can be maximized. This paper adopts two methods where the first method being the sensitivity analysis and the second method is the Gravitational Search Algorithm (GSA). Sensitivity analysis is a methodical technique, which is used to reduce the search space and to arrive at an accurate solution for recognizing the locality of capacitors. Capacitor values are allocated for the respective locations using GSA. The overall precision and dependability of the adopted approach were authenticated and verified on few radial distribution network with diverse topologies of varying sizes and complexities and also compared with an analytical Interior Point algorithm and one of the meta-heuristic optimization technique called Simulated Annealing. Computational outcomes obtained showed that the proposed method is capable of generating optimal solutions.     

10kW数字调幅发射机的基本原理及其研究新进展

主要介绍了10kW数字调幅发射机的原理与特点,以及数字调幅发射机的研究新进展,为10kW数字调幅发射机研究提供了经验。     

YS—SR1275高压空冷阻垢缓蚀剂的工业应用

随着广州石化进口高硫原油量的日益增加，作为处理高硫原油的加氢处理装置的设备腐蚀也大幅度增加。为了减缓加氢处理装置的高压空冷的结垢和腐蚀，确保装置长周期安全运行，在高压空冷系统进行YS-SR1275高压空冷阻琚缓蚀剂的工业应用试验。试用结果表明，YS—SR1275对高压空冷有较好的阻垢缓蚀作用。     

Development of a new model of olives de-stoner machine: Evaluation of electric consumption and kernel characterization

In this scientific paper, the quantitative and qualitative performances of three different de-stoner machines involved in an industrial olive oil plant were evaluated. The bioenergy production potential for olive stone in Italy was also estimated. The results confirmed that the best performance was obtained using the innovative partial de-stoner machine called “Moliden” because it does not lead to losses in oil extraction efficiency (as opposed to the total de-stoner machine) and it also extracts an amount of olive stone (approximately 65% of the total stone contained in the olives) that is greater than that obtained using the husk de-stoner machine (58%). In addition, the olive stone obtained by using a partial de-stoner machine contains lower oil, fine particle sizes and nitrogen compared to the olive stone obtained by using a husk de-stoner machine. This leads to advantages regarding combustion efficiency and the environment. Considering the olive production in Italy and in the Mediterranean basin, olive stone might be an attractive renewable source for energy production.     

基于TMP275的电机温度监控系统研究

文中基于TMP275温度传感芯片,研究设计了电机温度实时监测系统。以MSP430为核心处理器,通过红外无线发射模块,实现对电机设备温度实时在线监测。实验测试结果表明,在10℃至60℃时,系统测量精度可达+0.5℃,相对误差小于5.0%,响应时间小于0.5 s,该系统具有测量精度高,误差小,响应速度快,运行可靠等特点,可广泛应用于高精度仪器仪表控制系统中。     

Comparative study of IPTBE synthesis on HZSM-5 and ion-exchange resin catalysts

The title ether was synthesized using a batch reactor at 70–90°C and 1.6 MPa. The ion-exchange resins Amberlyst 15, Amberlyst 35 and Purolite CT275, and HZSM-5 zeolites with a SiO₂/Al₂O₃ ratio between 28 and 120 were used as catalysts. IPTBE synthesis rapidly reaches chemical equilibrium in the presence of resins with selectivities of 95–97%, diisobutene being the main byproduct. HZSM-5 zeolites are less active and selective than resin catalysts. Resins, especially Amberlyst 35, are suitable catalysts for obtaining IPTBE industrially.