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先导传播
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  leader propagation
     Starting position of the leader,velocity of leader propagation near the groundand leader instant current when leader reached the ground could be determined by usingthe time-varying curve of dE/dt. Meawhile,the features of inclination or flexion oflightning channel can he infered from the distribution of extreme value point by thecurve of dE/dt versus time.
     利用 dE/dt 时变曲线可以较精确地确定先导开始位置、接地附近先导传播速度以及接地瞬时的先导电流,同时利用dE/dt 极值点的特征可以揭示通道传播过程中倾斜、弯曲特征。
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  “先导传播”译为未确定词的双语例句
     Along with the coming of the new century, more and more enterprices have realized that the nucleal competing power of a corportion has transformed from separately factor like products> management、 human resources to the unified power of brand which takes enterprice as principal part、 products as intermedium、 design as preursor and means of public communication as weapons .
     随着新世纪的到来,越来越多的企业认识到新一轮竞争的核心将会从单纯的产品竞争、管理竞争、广告竞争、人才竞争转变为以企业为主体,产品为媒介,设计为先导,传播手段为武器的综合实力的竞争——品牌竞争。
短句来源
     By analyzing theoretically the electrostatic field change of a CG lightning leaderprocess,it is indicated that temporal variation rate of electrostatic field dE/dt caused byleader development is better than net field change ΔE for characterizing the leader prop-agation.
     通过对地闪电先导过程静电场变化波形的理论分析指出,先导所致静电场时间变化率dE/dt 是一个比静电场变化ΔE 更能反映先导传播特性的物理量。
短句来源
     篒n this paper, a further comparison of whitehcad's and zhu's EGM is presented. Leader incidence angte function in whitehead's model is found to be equivalent with the discharge dispersion function in zhu's model. A general physical picture of lightning shielding problem is given, together with the discussion about the physical meaning of the striking distanpe of EGM and the short comings of LP model.
     分析比较了Whitehead与朱氏电气几何模型(EGM),指出Whitehead模型中的先导入射角函数实质上是朱氏模型的放电分散性函数,提出了雷电屏蔽问题的一般物理图景,讨论了EGM中击距概念的物理意义、适用范围和先导传播(LP)模型的不足.
短句来源
     The initial light pulse was produced by the upward leader propagating into clouds and the vaporization of the wire as a result of leader development;
     其中,起始光脉冲由导线汽化和上行先导传播入云所引起;
短句来源
  相似匹配句对
     THE INITIATION AND PROPAGATION OF LIGHTNING LEADER IN POSITIVE AMBIENT ELECTRIC FIELD
     正环境电场中闪电先导的始发和传播
短句来源
     Wave propagation
     波的传播
短句来源
     OAI and its influence on the digital dissemination mode of academic journals
     开放文档先导及其对学术期刊数字化传播方式的影响
短句来源
     ELECTROMAGNETIC WAVES PROPAGATED ALONG HELICAL WIRES
     电磁波在螺旋线上的传播
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     The idea is the guide of the behavior.
     理念是行为的先导
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  leader propagation
Influence of negative leader propagation on the triggering and guiding of high voltage discharges by laser filaments
      
Fast-frame camera pictures allow the evaluation of the influence of the negative leader propagation on the triggering and guiding process.
      
Fast-frame camera pictures show the space-leader formation and the negative leader propagation for different configurations.
      
The minimum leader propagation times inferred in Appendix B are for leaders following an interstroke interval longer than a fewmilliseconds.
      


By analyzing theoretically the electrostatic field change of a CG lightning leaderprocess,it is indicated that temporal variation rate of electrostatic field dE/dt caused byleader development is better than net field change ΔE for characterizing the leader prop-agation.Starting position of the leader,velocity of leader propagation near the groundand leader instant current when leader reached the ground could be determined by usingthe time-varying curve of dE/dt.Meawhile,the features of inclination or flexion...

By analyzing theoretically the electrostatic field change of a CG lightning leaderprocess,it is indicated that temporal variation rate of electrostatic field dE/dt caused byleader development is better than net field change ΔE for characterizing the leader prop-agation.Starting position of the leader,velocity of leader propagation near the groundand leader instant current when leader reached the ground could be determined by usingthe time-varying curve of dE/dt.Meawhile,the features of inclination or flexion oflightning channel can he infered from the distribution of extreme value point by thecurve of dE/dt versus time.

通过对地闪电先导过程静电场变化波形的理论分析指出,先导所致静电场时间变化率dE/dt 是一个比静电场变化ΔE 更能反映先导传播特性的物理量。利用 dE/dt 时变曲线可以较精确地确定先导开始位置、接地附近先导传播速度以及接地瞬时的先导电流,同时利用dE/dt 极值点的特征可以揭示通道传播过程中倾斜、弯曲特征。

篒n this paper, a further comparison of whitehcad's and zhu's EGM is presented. Leader incidence angte function in whitehead's model is found to be equivalent with the discharge dispersion function in zhu's model. A general physical picture of lightning shielding problem is given, together with the discussion about the physical meaning of the striking distanpe of EGM and the short comings of LP model.

分析比较了Whitehead与朱氏电气几何模型(EGM),指出Whitehead模型中的先导入射角函数实质上是朱氏模型的放电分散性函数,提出了雷电屏蔽问题的一般物理图景,讨论了EGM中击距概念的物理意义、适用范围和先导传播(LP)模型的不足.

The luminous characteristics of the channel of artificially triggered lightning flashes were studied by use of digital photographic data obtained with a high-speed CCD camera system ( frame rate 1 000F/s) at very close range to the lightning. The techniques for triggering lightning were conventional one with a rocket trailing a grounded wire as well as a newly-developed one called altitude-triggering with the lower end of the wire not connected to the ground. The results showed that the transversal distribution...

The luminous characteristics of the channel of artificially triggered lightning flashes were studied by use of digital photographic data obtained with a high-speed CCD camera system ( frame rate 1 000F/s) at very close range to the lightning. The techniques for triggering lightning were conventional one with a rocket trailing a grounded wire as well as a newly-developed one called altitude-triggering with the lower end of the wire not connected to the ground. The results showed that the transversal distribution of channel luminosity was essentially symmetric. The duration of the channel luminosity and the number of light pulses for individual flash could be different noticeably, however, they had four common luminous phases, which associated with specific discharge processes. The light pulses during a flash were found to well correspond with that of electric field change and lightning current. The initial light pulse was produced by the upward leader propagating into clouds and the vaporization of the wire as a result of leader development; channel had being appreciably luminant when M component occurred; whereas the channel luminosity had become very weak or even ceased when light pulse of return stroke appeared. The lowest part of the lightning channel of an altitude triggered flash consisted of metal-vaporized and air-ionized ones, whose luminous behaviors were quite different: the channel luminosity of the latter was more intensive and lasted for a longer time, especially during the steady luminous period.

利用成像率为1000幅/秒的高速数字化摄像系统在380m的极近距离对人工触发闪电通道的发光特征进行了观测和研究。人工引发闪电除了采用传统的火箭拖带接地导线的触发方式外,还发展了导线下端不接地的空中触发闪电的新技术。结果表明,闪电通道的发光截面基本上呈对称型。各次闪电的发光持续时间和光脉冲的个数可以有很大的差别,但它们都可分成四个共有的发光阶段,并与特定的闪电放电物理过程相联系。闪电的光脉冲与闪电电流脉冲和地面电场变化有很好的对应关系。其中,起始光脉冲由导线汽化和上行先导传播入云所引起;M分量脉冲出现前闪道仍在可观地发光,而回击光脉冲出现前闪道的发光已经变得非常微弱或已测不到发光现象。空中触发闪电最下部的通道由金属导线汽化通道和空气离化通道两部分组成。它们的发光行为有很大的不同,尤其在平稳发光阶段,前者的发光较强且延续更长的时间。对各种发光成分的特点及其所联系的物理过程也进行了讨论。

 
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