查询词典 current impulse

This paper presented the research and exploration of mechanism and technics as well as the design of the magnetic circuit of this new compound machining, based on above, establishing the parameter model, meantime, analyzing influential effects on productivity of magnetic and EDM compound machining the holes through large numbers of experiments, including velcoity contrast experiments of pre-compound and after-compound machining with the change of current, velcoity contrast experiments of pre-compound and after-compound machining with the change of magnetic induction, velcoity contrast experiments of pre-compound and after-compound machining with the change of impulse width, experiments of the superficial roughness, experiments of the Electrode wastage, and intersectant experiments analysis as well as the change experiments of current waveforms. Through a number of experiments we analysed the influential effects of magnetic and EDM compound machining, compared the factors with EDM by oneself. A large of experiment records and deducibility have demonstrated that the productivity of magnetic and EDM compound machining is developed by 20%～400% than traditional EDM.

本论文对磁场电火花复合加工这种新的复合加工的机理、工艺和复合加工的磁路设计进行了研究和探索，在此基础上，建立了磁场电火花复合加工的参数模型，同时通过大量的随着电流变化磁场电火花复合前后加工速度对比实验、磁感应强度变化时的加工速度变化实验、随脉冲宽度变化的加工速度实验、表面粗糙度实验、电极损耗量实验、磁场电火花复合加工正交实验分析、电流波形变化等实验，实验分析了影响磁场电火花小孔加工效率的因素，并且跟单一的电火花加工中的影响因数进行了比较，大量的实验数据和理论推导证明磁场电火花复合加工比传统的单一电火花加工的效率提高了20％～400％左右。

After researches it was found that it takes place only in case of direct current or impulse current.

经过研究发现，它只是发生在案件直接电流或脉冲电流。

The protection functions of relay don't be affected by current intensity of circuitload, impulse current, imbalance currentload characteristic.

监视器的保护功能不受线路或负载的电流大小，冲击电流、不平衡电流和负载性质的影响。

The protection functions of relay don't be affected by current intensity of circuit or load, impulse current, imbalance current and load characteristic.

监视器的保护功能不受线路或负载的电流大小，冲击电流、不平衡电流和负载性质的影响。

Impulse current: Current to be used in the test for surge current resistibility of optical fibre cables.

脉冲电流测试光缆对浪涌电流。耐受能力时使用的电流。

The results of experiment show after inputting impulse current to alloy Al-4wt%Cu, its grain structure can be refined from 1.5 mm to 0.2 mm at impulse voltage 2 kV, capacitance charged frequency 0.5 Hz and circuit oscillatory frequency 50 Hz.

结果表明：脉冲电压2kV、电容的冲击频率为0.5Hz、电路的振荡频率为50Hz时，脉冲电流对Al-4wt%Cu合金作用后，晶粒尺寸由1.5mm减小到0.2mm。

Two kinds of silicon samples with distinct surface treatment, i. e., one surface was chemically etched and the other was unetched, were used to investigate the characteristics of leakage current and surface flashover of semiconductor under impulse voltage in vacuum. The experimental results showed that the surface conditions of samples affected these characteristics greatly. Before flashover, the Ohmic current was observed for unetched samples and the space charge limited current for etched samples, respectively. Meanwhile both samples showed quite different flashover tracks, and the surface-etched samples displayed a much higher onset voltage of flashover.

对采用和未采用表面化学腐蚀处理的半导体硅在冲击电压下的实验表明（参见 Zhang et al ， Applied Physics Letters， 2002），试品的表面状况对其泄漏电流和沿面闪络特性有着很大的影响：在沿面闪络之前，未经处理试品的泄漏电流表现为 Ohm 性电流，而表面处理过的试品表现为空间电荷限制电流特性；同时两类试品表面的闪络通道也表现出不同的特征，而采用表面化学腐蚀处理可以明显提高其沿面闪络电压。

The intensity of the magnets in permanent-magnet motors can increase as the motor size and output power increase. This causes difficulty in manufacture of large scale PM motors and consequently increases the cost. Post-assembly magnetization can be treated as a solution to the above problem, which fabricates the motors before the magnet is magnetized by applying large current impulse on the motor stator windings.

中文摘要由於永磁马达转子磁铁强度，会随著马达尺寸与输出功率增加而增加，导致大型永磁马达在制作上，因磁铁的强磁性造成组装上的困难，且易有铁粉等杂物附著，使得制作成本增加，故有必要使用新的充磁技术或特殊制程解决。

The microstructure of high melting point 20MnSi deformed steel bar after current impulse was studied.

研究了高熔点的20MnSi螺纹钢电脉冲处理后的微观组织。

Based on the current impulse which is used to describe sensitivity of initiating explosive devices,a method for safety design of bridge-wire electric explosive device is put forward.With the method,we can make products to meet the requirement of safety under a certain margin.

本文在用电流冲量表征火工品感度的基础上，提出考虑裕度的桥丝式电火工品安全性设计方法，使新设计的火工品在一定裕度条件下满足安全性的要求。

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。