火花放电

Most of the switch tubes used presently work in the gas spark region (the right branch of Paschen curve), and are made of graphite and mental such as tungsten, molybdenum, stainless steel and mercury.

目前实际应用的开关管多数工作在火花放电区域，使用的电极材料一般为钨、钼、不锈钢、水银、石墨等。

According to the conditions for the ESD spark and the figuration, the ESD sparks can be classified into six types: the corona discharge, the brush discharge, the cone discharge, the human physical discharge, the spark discharge and the propagation brush discharge.

根据放电火花的产生条件和形状特点，静电放电火花分为电晕放电、刷形放电、料仓堆表面放电、人体放电、火花放电和传播型刷形放电 6种典型放电类型。

The discharge process of capacitive circuit is observed with IEC spark test apparatus,voltage,current and energy of spark discharge are referenced with numerical method.

参考了火花试验装置研究了电容性电路闭合放电过程，对电容火花放电的电压、电流和能量的变化规律进行分析。

The discharge curve was measured; and the critical pressure between pseudospark and glow discharge was determined.

测量了伪火花开关耐受电压与气压关系曲线，确定了产生伪火花放电的气压范围。

DBD is a newer technology obtaining non-equilibrium plasma than before. It can restrain current from augmenting unboundedly,by using dielectric. It also can eliminate sparkle discharge and arc discharge in discharge clearance.

不同于以往的放电形式，是由于电介质的存在而抑制放电电流的无限制增大，从而阻止放电间隙产生火花放电或弧光放电，并且电场中高能态的电子数量多。

In sparkle discharge ,following conclusions could be reached:(1) overall spectral intensity in nitrogen is lower than in oxygen . When water is added, integrality light intensity is lower compared with the pure gas condition.(2) No matter it is nitrogen or oxygen, when water is added, syllabify three spectral lines of atomic H: Hα(656.3nm), Hβ(486.1nm), Hγ(434.0nm) could be seen. What is more, when water is added into oxygen, the spectral line of H atom becomes stronger.(3) When discharge in pure nitrogen, the light intensity falls with the increasing gas flow rate. While if water is added, the light intensity will rises with the increasing gas flow rate.(4) When discharging in pure oxygen, the light intensity rises with increasing gas flow rate. While if water is added, with increasing gas flow rate the light intensity initially will change as this:first rise, then saturate at about 140l/h, finally falls.

在火花放电中：(1)氮气的整体光谱强度要弱于氧气的整体光谱强度，加水时的整体光谱强度比纯气体中放电小很多；(2)无论所通为氮气或氧气，加水时可以清晰的看到Hα(656.3nm)，Hβ(486.1nm)，Hγ(434.0nm)三条氢原子的谱线，而且在氧气加水的情况下产生的H原子的谱线要强些；(3)纯氮气中放电时随着气流量的增大放电光谱的强度随之降低，氮气加水放电时随着气流量的增大放电光谱的强度随之升高；(4)氧气放电时，随着气流量的增大，放电光谱的强度随之升高，氧气加水中放电时随着气流量的增大，放电光谱的强度开始随之升高，在140l/h时的值最高，接着就开始下降。

Experimental investigation on the hold-off voltage of pseudospark device and its discharge processes .

赵会良。赝火花放电装置耐受电压及其放电过程的实验研究。

However, because of the natural characteristics of the micro and small hole EDM, such as weak discharge energy, high pulse power supply frequency, unstable spark discharge states and small discharge gap, etc., there are still some key technical difficulties in its machining process need to be solved: the difficulties in real-time discharge states detection, in accurate control of machining process, in prediction of discharge states, in improvement of machining system precision and in on-line preparation of micro electrode, etc.

但是由于微细及小孔电火花加工自身具有的放电能量极微、脉冲电源频率高、难以获得稳定的火花放电状态以及放电间隙极小等固有特性，决定了其加工过程仍然存在放电状态实时检测方法单一、加工过程难于准确控制、放电状态难于预测、加工系统精度提高困难和微小电极在线制备困难等关键性技术难点，亟待突破和解决。

In this paper,the spark current caused by capacitor discharge during the process of spark plug gap breakdown is simulated by modeling the equivalent circuit of the second-circuit capacitor discharge of the auto ignition system.

现通过建立汽车点火系统次级电路火花放电的等效电路模型，模拟了火花塞间隙击穿过程中由于电容放电引起的火花电流的变化以及对周围环境的影响。

Urban rail transit ; Power polar ; Spark discharge ; Arc discharge ; Off-line ; Discharge mechanism

城市轨道交通；电源极性；火花放电；电弧放电；离线；放电机理

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。