预放电

The utilization factor of ozone can be increased while the countercheck nets of stainless steel were placed in the pretreatment aqueous solution.

用40目不锈钢网作地电极、采用正脉冲放电能提高放电效率；预处理溶液中放置不锈钢阻挡网有助于提高臭氧的利用率。

It includes high power high voltage constant-current-charging system, capacitors bank, discharge control system, power supply of preignition for Xe-flashlamps, general control and diagnostic system. The power conditioning system drives flashlamps that pump the SSHCL. Flashlamps are driven by high voltage Silicon Controlled Rectifiers switched, resonant charged, discharge pulse forming network. The system uses microchip and digital circle which is based on CAN-bus for control and diagnostics. Energy diagnosis and thermal management are controlled by computers.

其中大功率高压恒流充电装置采用了L-C串联谐振电路，充电功率大，效率较高；储能装置采用了多节脉冲成形网络，可产生波形良好的强电流放电脉冲；放电控制装置采用高压大功率晶闸管，开关速度快，工作稳定；预燃与触发装置采用了开关电源电路，效率高、功耗小；总控与测量装置采用基于CAN总线的数字电路和单片机技术，控制冷却系统在激光器出光时对脉冲氙灯进行水冷，并对全系统进行控制和状态检测，同时具有过压、过流、过热等保护功能。

The optimized analytical conditions were as follows: discharge voltage of 1 100 V, discharge current of 50 mA, preburn time of 45 s and integration time of 10 s.

以铁为内标元素，优化分析条件为放电电压1100V，放电电流50 mA，预溅射时间45 s，积分时间10 s，建立直流辉光放电光谱法测定硅钢中11种元素的定量分析方法。

Through investigating the effect of glow discharge parameters such as voltage,current,preburn time and integrating time on the precision and intensity of the emission line,the parameters of analyzing stainless steel were optimized and a new method for the determination of 11 elements in stainless steel by direct current glow discharge -optical emission spectrometry was established.

通过对直流辉光放电光谱法分析不锈钢样品光谱行为的研究，考察了工作参数如放电电压、电流、预溅射时间和积分时间对光谱强度和稳定性的影响。

The results show that the effects of humidity on AC flashover voltages are remarkably different in different relative humidity ranges as a result of the differences of the predischarge type.

本文根据电场分布的计算结果及预放电类型随相对湿度的变化规律，分析了不同湿度区间内湿度对工频闪络电压的影响。

It was found that the predischarge type varies clearly with relative humidity as the results of the influence of relative humidity on the field distributions.

发现，由于相对湿度对工频电场分布的显著影响，两类试品的工频预放电类型极为明显地随相对湿度的变化而改变。

Firstly, corona inception voltage of the post insulator and surface leader inception voltage of the bushing versus relative humidity were investigated. The predischarge phenomena in connection with relative humidity were observed under AC voltage by photographing.

首先，对支柱绝缘子的电晕起始电压及套管表面先导起始电压与空气相对湿度的关系进行了研究；用静止照相的方法分别观察了支柱绝缘子和套管在不同相对湿度范围内的工频预放电现象。

The model successfully describes the breakdown characteristics of SF〓 as a function of impulse wavefront according to the predischarge process obtained by a current probe. It also shows promise to be applicable to the flashover of spacers in SF〓 and the discharge in SF〓 mixture.

结合由电流探头测得的冲击电压下SF〓气体的预放电过程，该模型成功地解释了SF〓气体击穿特性随冲击电压波头时间而变化的规律，而且该模型也适用于SF〓气体中绝缘子沿面闪络和SF〓混合气体放电。

Besides, surface predischarge phenomena were studied by taking Lichtenberg figures on the bushing and a glass plate model simulating the electrode arrangement of bushings under impulse voltages.

此外，用彩色及黑白胶片电花图技术研究了套管和平板玻璃放电模型在正、负极性冲击电压下的表面预放电现象，研究了正极性表面先导的传播长度与平板玻璃厚度及相对湿度等影响因素的关系。

Dependence of flashover voltage on several physical factors, that is applied voltage waveform, predischarge conditioning, geometry shape and length, geometry area, dielectric material, surface treatment, magnetic field effects and multilayer high gradient insulator technology, are expatiated.

文中系统总结了目前高压真空绝缘闪络特性的实验研究成果，具体阐述了几种典型实验模型及研究方法，以及几种重要物理因素，即绝缘材料介电常数、绝缘体几何形状及长度、施加电场波形、绝缘体表面处理、绝缘体几何面积、绝缘体预放电处理、磁场作用、多层高梯度绝缘技术等等，对真空绝缘闪络特性的影响。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。