脉冲持续时间

An efficient sparker for a pulse powered underwater acoustic source for minesweeping is capable of repetitive discharges at about 15Hz for at least one hour without replacement or maintenance.

水下扫雷用的、用于脉冲水下声源的高效火花发生器能够重复放电，频率约为15 Hz，持续时间至少1h，无需更换和维护。

Subthreshold micropulse diode laser treatment can shorten a laser pulse limits, reduce the spread of photocoagulation damage caused by heat conduction during a laser exposure, avoid chorioretinal scars which could expand or increase the risk of iatrogenic choroidal neovascularisation and improve long term visual prognosis.

黄斑水肿的治疗近年来得到广泛的关注，成为研究的热点，但各种新方法的并发症和疗效尚存在一定的争议，阈下微脉冲半导体（810nm）激光治疗黄斑水肿，减少激光曝光持续时间和使用不可见激光斑，能降低可见光凝斑本身对黄斑区视网膜脉络膜的损害，减轻黄斑水肿和提高视力。

By superposing a properly selected range of the harmonic spectrum, we get an isolated 65as pulse. theoretically

最后通过选取叠加适当阶次的谐波谱，我们得到了持续时间为65阿秒的孤立阿秒脉冲。

RESULTS: Patients, treaters, and raters were effectively masked. Minimal adverse effects did not differ by treatment arm, with an 88% retention rate (90% sham and 86% active).

干预措施：以120%的运动阈值（频率10赫兹，每系列持续4秒钟，其中每系列脉冲之间间歇26秒）时间为37.5分钟（每次治疗期间给与3000个脉冲），治疗仪器采用8字形固体核心线圈，假对照组采用的仪器是一个相似的线圈，将镍镉耐热合金插入其中以屏蔽磁场，阻止头皮电极传导双侧躯体本体感觉。

The calculation of the model shown that the laser pulses started when the current pulse had disappeared about 2-3 μs, and its duration time is between 1-5 μs. Furthermore, it can be predicted that the continuous or quasi-continuous laser pulse will be obtained under the proper excited pulse duration.

具体的模拟计算显示，激光脉冲出现在放电结束后2-3μs，持续时间在微秒量级；并进一步表明如果选择合适的激发周期，有望实现连续或准连续激光输出。

The high current pulse must be of sufficient magnitude and duration to cause at least one small drop of molten metal to form and be propelled by the pinch effect from the end of the wire to the weld puddle.

高电流脉冲必须具有足够的幅值和持续时间，造成至少一个小熔滴形成和由于收缩效应从焊丝端部被推进到焊接熔池。

The concept of equivalent rotationally rigidity is offered and the formula of rotationally rigidity is obtained.

主要做了如下几个方面的工作：对伸臂位于顶部的单层框架—筒体模型进行分析，提出了等效转动约束的概念和转动约束刚度的表达式。

Male cats normally do not need aftercare with the exception of the night after the anesthetic.

男猫通常不需要善后除了晚上的麻醉。