基于ATT7022B和ARM微处理器的多功能三相电力仪表的设计与实现

介绍了ATT7022B高精度多功能防窃电三相电能专用计量芯片的主要特性,给出了基于ATIT022B芯片和ARM处理器AT91SAM7S256设计多功能三相电力仪表的设计方法,利用该方法设计的三相电度表也可以作为配电监控终端单元。     

双波长皮秒脉冲与可调谐脉宽产生的实验研究

为了提高多波长光脉冲设备的实用性,采用双波长工作原理,设计了一种稳定的双波长半导体环形光纤激光器。讨论了环形腔色散、滤波器脉宽以及调制深度等对输出脉冲的影响。结果表明,双波长光脉冲的重复率为5.0GHz,典型脉宽为20ps,双波长光脉冲具有良好的边模抑制比,当输出波长为1554.75nm和1557.21nm时,边模抑制比分别为29.1dB和29.7dB,其典型的输出功率分别为-6.7dBm和-6.1dBm,输出光谱的峰值功率波动小于0.5dB。这项研究对太赫兹源和多波长光脉冲设备的研究具有借鉴意义。     

Macro mechanical parameters＇ size effect of surrounding rock of Shuibuya project＇s underground power station

Scale effect is one of the important aspects in the macro mechanical parameters‘ research of rock mass, from a new point of view, by means of lab and field rock mechanics test, establishment of E-Vp relation, classification of engineering rock mass, numerical simulation test and back analysis based on surrounding rock‘s displacement monitoring results of Shuibuya Project‘s underground power station, rock mass deformation module‘s size effect of surrounding rock of Shuibuya Project‘s undegroud power station was studied. It‘s shown that rock mass deformation module‘s scale effect of surrounding rock of Shuibuya Project‘s undeground power station is obvious, the rock mass deformation module to tranquilization is 20% of intact rock‘s. Finally the relation between rock mass deformation modules and the scale of research was established.     

框架的膨胀

引入了Hilbert空间中点列的膨胀的概念,即在原有点列中添加新的元素称为点列的膨胀.定义新的"并"来表示点列的膨胀.讨论了Bessel族,框架以及紧框架膨胀后的稳定性,并得到了一系列的充分必要条件.     

Hilbert空间中的K-框架

引入了Hilbert空间中K-框架的概念;讨论了Hilbert空间中的框架和K-框架之间的关系;并且研究了K-框架的膨胀.     

微地震注水前缘监测在低渗油藏史103井区的应用及分析

微地震监测技术是以摩尔-库伦等理论为基础,通过记录、定位油水井在压裂、注水时因地层压力变化而产生的微地震源资料,进而计算出水驱前缘、注入水波及范围、优势注水方向,直观地评价区决水驱状况、水淹方向评价,为油藏下步开发调整,确定注采井距、注水参数、调堵方案提供依据.     

2.4GHz Zigbee数传模块传输距离的估算方法

采用802.15.4a信道损耗模型,探讨了2.4GHz Zigbee射频模块辐射传输损耗的分析方法,分析了影响传输距离的因素,推导了最大传输距离的估算公式．针对设计的Zigbee射频模块具体电路,对传输损耗和最大传输距离进行了分析计算,并作了实验测试,估算误差小于10％,符合工程应用要求,可作为2.4GHz Zigbee射频数传模块的设计和工程应用传输距离估算的理论依据．     

一种智能电表电路暂态故障实时识别方法

基于故障信号频率的识别模型由于受到周围磁场等的影响,精度较低,为提高智能电表电路暂态故障信号实时识别的准确性,从故障信号处理的方向出发,基于时域粗检测方法,研究了一种智能电表电路暂态故障实时识别方法.对智能电表电路故障信号采样,使故障信号按照指定的路线传输,就要增加通道的接收能力,利用小波分析方法,对复杂的电信号进行样本预处理,经过时域检测后的信号被统一进行重新分布,以较为简单的方式进行标记;基于小波熵测度的故障信号融合模型,采用信息熵方法融合分离相似故障信号,确定所有智能电表故障电路信号暂态特征;构建基于小波熵测度的故障信号融合模型,在信号谱上完成信号的筛选与分解,实现智能电表电路暂态故障信号实时识别.实验结果表明,针对智能电表电路接地短路、两相接地短路、相间短路、三相接地短路四种不同类型的暂态故障,通过该方法识别出的故障电压曲线值与实际的值相差小于0.3 V,具有较高的识别准确性,具备一定的实际应用意义.     

Synthesis of P（St-BA-MAA-SPAA） nano-latex and its application in high anti-corrisive coating

A novel zinc-rich pigment based on P（St-BA-MAA-SPAA） nano-latex was obtained, which is suitable for the use in hot alkali liquid medium. The nano-latex was synthesized by active emulsifier latex polymerization method with monomers of styrene （St）, butylacrylate （BA）, methylacrylic acid（MAA） in the presence of active emulsifier 3-sulfopropylacrylate（SPAA）. The synthesis condition and properties of the latex were investigated. And the anti-corrosive property of the resultant zinc-rich coating was studied. The results show that the nano-latex is self-stabilized and has a narrow particle diameter distribution, the average diameter of the latex particles is 71 nm. Zinc powders can be evenly dispersed in the nano-latex, which indicates that the P（St-BA-MAA-SPAA） nano latex can be used as the binder of zinc-rich coating. The resultant zinc-rich coating is able to resist the invasion of hot alkali solution（the temperature is 95 ℃ and the pH value is 14） for 480 h and the exposure time in salt spray is 1 200 h. Moreover, the coating shows good thermal conductivity and static electricity properties, its thermal conductivity and electric resistivity are 21-37 W/（m.K） and 6.7 × 10^5-3.5 × 10^6 Ωcm, respectively.