中小型铝电解厂供电系统调度运行方式的探讨

公司2 0 0kA电解槽投产后,用电负荷增大,自备电厂负荷小,不能满足生产需求,由于所在地区电网薄弱,供电不稳定,特别是遇到发、供电设备检修和突发故障时,电流强度波动大,对电解槽生产影响较为严重。根据这种现状,经过长期运行实践,制定了不同设备检查及故障状态下35kV发、供电系统生产调度运行的最佳方式,保证了企业正常生产,提高了企业经济效益     

A system for powder transport based on piezoelectrically excited ultrasonic progressive waves

The transport and dosage of granular materials are an important part of Process Engineering. Thereby, the food, chemical, pharmaceutical and coating industries set high demands on the transport and dosage performances of the used plants. In this context, Ultrasound Process Technology in the past years has developed itself into an attractive alternative compared to presently used classical technologies.

This paper describes the application of ultrasonic progressive waves in a powder-feeding device. The use of a specific pipe material with appropriate damping characteristics allows to generate a progressive wave using a single piezoelectric actuator. Small objects can be carried along the surface of a pipe by the elliptic motion at the surface, which is the result of a flexural progressive wave. The operational principle is the same as in travelling wave ultrasonic motors.

It was experimentally confirmed that the device can be used for feeding and supplying small amounts of powder. The powder-fed performance, however, strongly depends on environmental conditions, so that a control of the system is required. Construction and characteristics of a trial device are shown.     

Modification of Boundary Parameters and Fluctuations by IBW and LHCD in the HT-7 Tokamak

Measurements of boundary parameters and their fluctuations have been performed in ohmic (OH) plasma and Ion Bernstein Wave (IBW) and Lower Hybrid Current Drive (LHCD) enhanced confinement plasma using a pneumatically driven Langmuir probe array on HT-7 toka-maX. In the enhanced confinement plasma~ the gradients of electron density and temperature become higher and a transport barrier comes into being in the vicinity of the limiter. The boundary potential shows a clear modification in the same region. The fluctuation levels are significantly depressed and the coherences between fluctuations are reduced evidently in the enhanced plasma.Meanwhile, we obtained the spectral features and the poloidal phase velocity of fluctuations us-ing a two-point correlation technique and found obvious modifications of the turbulence and the poloidal flow. The results suggest that the improved confinement in the IBW and LHCD enhanced plasma is at least partially due to the modification of the boundary parameters and the suppression of the boundary fluctuations and fluctuation induced fluxes.     

Propagation Properties of Electromagnetic Wave in a Plasma Slab

In this paper, the calculated results about the propagation properties of electromag-netic wave in a plasma slab are described. The relationship of the propagation properties with frequencies of electromagnetic wave, and parameters of plasma (electron temperature, electron density, dimensionless collision frequency and the size of the plasma slab) is analyzed.     

660MW机组粉管内煤粉浓度测量研究

阐述了利用光学波动法测量颗粒浓度的原理,并在现场条件下,利用基于此原理的仪器对电站锅炉煤粉管道煤粉浓度分布作了测量研究,得出浓度分布规律,对电站锅炉煤粉管道浓度测量及分析电站锅炉稳燃、节能有指导意义。     

等离子体环境中电磁兼容

文中力求通过实验研究与理论结合的方法，分析在等离子体环境中传播的电磁波与等离子体的相互作用。并设计加工实验装置以验证上述分析结果。     

电源规划中的可靠性分析

采用解析法对电源规划中的可靠性进行了分析，为电源规划和检修安排提供了重要的参考依据，电源规划中的可靠性是对发电容量是否满足负荷需求进行判断。因此建立了相应的容量模型和负荷模型，当考虑检修计划时，利用减机组算法修改容量模型，由于互联系统支援可以大大提高系统的可靠性，考虑系统相互支援以及联络线容量，建立了等效支援系统模型，利用并联算法将容量模型、负荷模型，等效支援系统模型合并，形成最终的综合模型，从综合模型中可得到5个可靠性指标：电力不足概率LOLP（Lack of Load Probadility)，电力不足时间期望LOLE（Lack of Load Expectation)，电量不足期望值EENS（Energy Expectation Not Served)，电力不足频率LOLF（Lack of Load Frequency)，电力不足持续时间D（Duration)。根据解析法已编制程序，并投入了实际应用，应用中证明算法设计的合理性。     

德布罗意波及其非相对论近似

通过分析德布罗意义和速度特性，说明了它是相对论意义下的波，讨论了在非相对论量子力学中，以经典能量代入德布罗意关系式进行了计算的原因。     

低能区(e,2e)反应的多重散射理论

对文献［７］发展的（ｅ，２ｅ）反应多重散射理论做了改进用得到的波函数计算了能量为５４４ｅＶ的（ｅ，２ｅ）反应的截面，结果表明改进后的多重散射理论与实验符合较好