人工神经网络在交流传动控制中的应用

综述和分析了人工神经网络在交流传动控制中的应用 ,提出了有待解决的问题 ,对今后的发展趋势进行了展望。     

近似模态控制分析法及其在选择灵活交流输电稳定器安装地点与反馈信号中的应用

文章提出了一种不需要计算系统矩阵的特征值和特征矢量,在应用和计算上较部分多模分解法更加简便的新的近似模态控制分析方法,并给出了将其应用于多机电力系统中灵活交流输电稳定器安装地点与反馈信号选择的实例。     

交流变频技术在大型铸造起重机的应用方案探讨

本文简要介绍了大型铸造起重机结构形式和工艺特点,以及交流变频技术目前发展特点,针对铸造起重机的工艺特点和各机构的负载特点,分析了交流变频技术在大型铸造起重机中应用的可行性和先进性。     

交流电桥灵敏度问题的探讨

通过理论和实验证明,阐述了提高交流电桥灵敏度的方法和测量电路的选择,从而减少实验的系统误差.     

High-quality output PWM AC voltage regulator based on Cuk converter

This paper describes the design of an AC–AC converter capable of generating a high-quality output. It is based on the Cuk configuration, with the transistors replaced by bidirectional switches. Since there are no transformers in the configuration, the converter lends itself to a compact and lightweight implementation. The design process is aimed at using, as much as possible, the tools and devices already developed for DC–DC applications. This approach greatly simplifies the design and implementation of the converter. An integrated circuit, developed for DC–DC applications, is used to control the converter. Both the set-point and the feedback signal are rectified in order to fit the input range of the controller. Tests performed show that the output exhibits a maximum total harmonic distortion of 3% (resistive load). The efficiency is slightly higher than 89%, and the average output regulation is 0.3%. The converter is capable of correcting voltage sags down to 60% and voltage swells up to 30%, with the output returning to its nominal value within one mains cycle. The results show that the converter is suitable for energizing information-processing equipment.     

AC600二次侧非能动应急堆芯余热排出系统实验装置及研究计划

ＡＣ６００二次侧非能动应急堆芯余热排出系统实验装置是一座大型非能动安全系统实验研究装置，在设计上，它以热工水力模拟理论及模拟准则为依据，在保持原型系统主要热工水力现象和过程的前提下，对系统进行了必要的简化，本文介绍了该实验装置回路，电气，仪表及测控系统的设计原则和设计结果，以及第一阶段研究计划和内容，最后，根据调试和运行结果总结了设计特点和经验。     

Mass transfer between a liquid and an array of discs in a cylindrical container. Part I: Pumped flow or rotation alone

This paper deals with average mass transfer between a liquid and both sides of discs arranged as baffles in a cylindrical container. The case of pumped flow alone through the stationary arrangement is first considered; the radial flow between the pairs of stationary discs is divergent and convergent successively. In other experiments, there is no pumped flow, but the discs are rotated between the stationary annular discs. The mass transfer coefficients are measured electrochemically for different geometrical and hydrodynamic conditions and the results are empirically correlated. The behaviour of corresponding surfaces involving a convergent or a divergent radial flow is discussed.     

The Application of Membrane Contactors for the Removal of Ammonium from Anaerobic Digester Effluent

The present study investigated the removal of ammonia from anaerobic digester effluent using membrane contactors. For mass transfer, hollow fiber membrane contactors offer a multitude of advantages compared to stripping technologies. In conventional applications of membrane contactors, the ammonia rich solution circulates through the fibers. For this kind of application, the very high content of suspended solids in digester effluents requires an additional removal step in order to guarantee undisturbed operation conditions. In a new approach, the membrane fibers were simply submerged into the anaerobic digestate and the performance was investigated at moderate temperatures ranging from 20 to 40°C and pH values lying in the range of 8.6 to 10.0. It was demonstrated that the new approach can be applied efficiently for the treatment of particle rich solutions with high ammonia concentrations of 3.000–3.500 mg/L, obtaining removal rates from 80 up to 98.5%. The mass transfer coefficients lay in the range of 12.4–37.0 × 10^?3 m/h and were absolutely comparable to values reported by other authors.     

Enhancement of solid dissolution process under the influence of rotating magnetic field

The main objective of this work is to study the effect of rotating magnetic field (RMF) on the dissolution process of NaCl-cylindrical sample. The experimental investigations are provided for the explanation of the influence on the dissolution process of a solid body to surrounding its dilute solution in the experimental set-up with the RMF generator. The analysis indicated the strong influence of the localization NaCl-cylindrical sample on the enhancement of mass transfer process. The mass transfer process under the action of RMF is described by means of the dimensionless equation with the local magnetic Taylor number.     

不同掺量碱集料的活性交流阻抗谱

本文以交流阻抗谱、膨胀率和MIP为研究方法,对不同掺量碱集料活性进行研究。结果表明:交流阻抗谱电化学参数与材料孔隙微观结构有着密切的联系。电阻Rs以及相角θ能表示碱集料活性的大小,可作为碱集料活性的评定方法;当混凝土中活性SiO2含量较高时,孔溶液中OH-离子会被活性SiO2颗粒大量吸附,导致参与碱硅酸反应的碱离子不足,碱硅酸反应生成的碱硅酸凝胶体数量减少。在碱硅酸反应中,活性碱集料与非活性集料之间的比值存在最劣点。