排序方式: 共有26条查询结果,搜索用时 15 毫秒
1.
2.
3.
通过多年实践,总结出目前最常用的几种加工中心对刀方法,并结合沈阳机床集团最新研发的飞阳F0数控系统,直观、系统地介绍了包括试切法、塞尺法、寻边器法等常用的对刀方法,能够对加工中心初学者提供一定的帮助。 相似文献
4.
<正>近日,江西省赣东、赣中普降大到暴雨,局部大暴雨到特大暴雨。江西省委常委、组织部部长、副省长、省防指政委刘强来到江西省防汛抗旱指挥部(以下简称"防指")值班室,看望慰问端午节值班人员并调研指导江西省强降雨防御工作。座谈会上,江西省防指副指挥长、省水利厅厅 相似文献
5.
6.
对水准高程精度、可靠度进行了系统的分析,给出了GPS高程与水准高程的可比性。验证了在一定范围内,GPS高程的适用性,对GPS高程网的布设具有十分重要的指导意义。 相似文献
7.
本文以尖山铁矿贯通控制网为例,给出了一种平面控制网的优化设计方法,该方法无论是对新网的布设还是对旧网的改造均有实用意义。 相似文献
8.
To discuss the modes of dielectric barrier discharge(DBD) between needle-to-plane electrodes in air,DBD is generated and observed on a needle-to-plane device at atmospheric pressure air.Fast images of the DBD are taken by using a charge couple device(CCD) cinema with a macro lens,while the electrical and photo-electricity waveforms of the DBD are recorded.The current waveforms show that under an applied voltage of 3 kV,there are numerous short current pulses in both positive and negative half-periods of discharges.However,under 6 kV,there are still the numerous short current pulses in the positive half-periods,but only one wide current pulse in each negative half-period.This difference is also found in the photoelectric signals.The streamer,corona and glow discharges are observed from the images of the discharges at different applied voltages.The structure of glow discharge in the negative period is exactly the same as that of the low pressure glow discharge.However,in the positive period of discharge there is always a streamer.In the negative period of discharge,while the applied voltage increases,the transition from corona to glow discharge is observed.The progress of a transition between streamer and glow discharge at 6 kV during one period is analyzed.The glow discharge appearance is determined by two factors: the discharge current is limited to a certain extent by the dielectric layer; the charges deposited on the dielectric layer during the last half period enhance the intensity of the electric field.At an insufficient applied voltage,the cathode drop leads to no glow discharge,but Trichel pulses. 相似文献
9.
10.