电弧

A kind of low power arcjet structure is designed, produced and combined in this thesis.

本文设计了一种低功率电弧加热发动机的原理结构，完成了发动机的加工、组装和试验系统的组建。

The result shows that, when a free droplet transfer mode is applied in high-speed welding , the workpiece is heated by the arc throughout the process and thus the molten pool can not solidify in time.As a result, the molten pool is very long, which gives way to the instability of bead formareron and pinch effect of the liquid metal,so that it finally leads to the humping phenomenon. Based on the analysis and experimental result, the short-circuiting transfer mode is suggested to improve the bead formation in high-speed welding .

理论分析和试验结果均表明，采用自由过渡的熔滴过渡形式进行焊接，工件始终处于焊接电弧的加热下，在高速焊接时，熔池不能及时冷却，熔池明显拉长，由扰动引起的振动波长大，当熔池的拉长达到一定程度时，会发生液体金属的失稳和颈缩的现象，造成驼峰焊道。

Melamine is an important organic chemical intermediate products, mainly used to produce melamine resin, have excellent water resistance, heat resistance, arc resistance, and excellent fire retardant.

三聚氰胺是一种重要的有机化工中间产品，主要用来制作三聚氰胺树脂，具有优良的耐水性、耐热性、耐电弧性、优良阻燃性。

In this thesis, a set of DC are plasma jet system is set up to produce diamond films.

本文自行设计和建立了一套直流电弧等离子体喷射法制备金刚石薄膜的系统，制备出了高质量的金刚石薄膜，沉积速度达到65μm／h。

In this thesis, a set of DC are plasma jet system is set up to produce diamond films. The deposition rate reaches 65μm/h.

本文自行设计和建立了一套直流电弧等离子体喷射法制备金刚石薄膜的系统，制备出了高质量的金刚石薄膜，沉积速度达到65μm／h。

The authors observed the existence of active and idle arcs on the driving pulley and suggested that under some operating conditions, it is plausible for the bands to contribute up to 40–45% of the total transmitted torque.

作者们观察到存在的活跃和懒惰的驱动滑轮和电弧的建议下，操作条件下，它是似是而非的乐队为40 - 45%的总传递扭矩。

Several types of processes and characteristics of super-fine SSP are analyzed and compared, they are high frequency plasma spherical method, direct current plasma spherical method, carbon pole electrical arc spherical method, gas burnt flame spherical method, high temperature fused quartz jet and chemo synthesis spherical method.

本文对国内的研究开发现状和国际球形石英粉的生产现状进行了分析研究；分析比较了高频等离子球化法、直流等离子体球化法、碳极电弧球化法、气体燃烧火焰球化法、高温熔融喷射以及化学合成球化法的工艺特点。

At the same time, along with the increment of cities' railway transportation, it isharder and harder for the traditional protection equipments to distinguish the remote shortcircuit fault or the train starting correctly, especially for th...

同时，随着城市轨道交通系统运量的不断加大，传统的保护装置越来越不能正确可靠地区分远端短路故障状态与机车起动状态，尤其是当发生远端电弧故障或经大过渡电阻故障时，往往造成保护动作时限加长。

Secondly, making use of the good time frequency characteristics of the wavelet analysis in the signal processing, the wavelet softthreshold filtering of the swing CO2 welding voltage signal under the arc discharge sense was carried out, showing the possibility of removing the peak current of the shortcircuit transition and improving the signal-to-noise ratio.

二是利用小波分析在信号处理上良好时域、频域局域性，对电弧传感方式下的摆动焊接电流进行了软阈值滤波，取得了良好的效果，消除了短路过渡所造成的峰值电流，提高了信噪比。

At the same time, along with the increment of cities' railway transportation, it isharder and harder for the traditional protection equipments to distinguish the remote shortcircuit fault or the train starting correctly, especially for the fault with electricity arc ortransition resistance. This always results in the equipment operation time longer that it can'tcut off the short fault rapidly.

同时，随着城市轨道交通系统运量的不断加大，传统的保护装置越来越不能正确可靠地区分远端短路故障状态与机车起动状态，尤其是当发生远端电弧故障或经大过渡电阻故障时，往往造成保护动作时限加长。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。