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脉冲宽度

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Variations of attenuation coefficients with rain rate for MP and LP model are compared under Mie theory and Rayleigh approximation. The approach to the solution of the Fourier integral in closed form is adopted for pulse propagation through rain medium .

在此基础上应用傅立叶时域积分近似解的方法研究了毫米波段脉冲波通过雨介质时,脉冲畸变随频率、降雨率、传播距离及脉冲宽度变化的关系。

We discussed the effect of the self-phase modulation, ionization, energy loss, and the density of the gas.Ⅱ.

研究在阿秒脉冲产生过程中,驱动激光脉冲载波相位和脉冲宽度的影响。

Development of OA kneepad : The kneepad density-wave output can be controlled by 2Hz different frequencies to 300 Hz stimulation pulse component, the pulse width of 100 to 150 μ s between the positive and negative output symmetry to the stimulation pulse. The rechargeable mobile phone batteries ( 3.7V) were served as power supply and SCM as timer with automatic shutdown after 30 minutes.

OA护膝的研制:护膝输出的疏密波可控制由2~300Hz不同频率刺激脉冲组成,脉冲宽度在100~150μs 之间,输出正负向对称的刺激脉冲,采用可充电的手机电池(3.7V)供电,单片机定时,30min 自动关机。

After proper differential delay, an UWB monocycle pulse with 84-ps width and the fractional bandwidth of 153% is generated after photodetection.

两个高斯脉冲经过适当的延时,光电检测后产生超宽带单周期脉冲,其脉冲宽度为84ps,相对带宽为153%。

The main principle of this technique is to control sensitization time of photographic plate by light impulse instead of shutter.

高速频闪摄影技术的主要特点在于:用光脉冲代替相机快门,以控制底片的感光;在光脉冲时间非常短(本文最小光脉冲宽度可达8μs,其技术指标代表目前国内的最高水平)的情况下,达到对高速运动的流体"冻结"而拍照、观察的目的。

In order to provide increased pulse width without compromising range resolution, a technique is used that provides for the transmission of a long pulse that can be compressed into a short pulse length in the receiver.

为了提供更多的脉冲宽度不损害分辨能力范围,使用提供长脉冲传输的技术,它可以在接收器中被压缩成短脉冲长度。

The pulsed Nd:YAG laser cladding is one of the most effective methods of the precise repairing technology. It is decided by the voltage, electric current, pulse length, pulse frequency, scanning speed and beam diameter of the Nd:YAG laser.

脉冲Nd:YAG激光熔覆技术是精密修复塑料模具最有效的方法之一,激光器的电压、电流、脉冲宽度、脉冲频率与激光的扫描速度、光斑直径等工艺参数直接影响着熔覆的质量。

The mathematical expression between DOP and DGD is derived for arbitrary waveshape and Gaussian pulse. Then the relationship of DOP-DGD with different power splitting ratio, width of pulse, and amount of pluses is theoretically analyzed.

推导出了准单色光波情况下任意波形和高斯脉冲的偏振度的数学表达式,理论分析了高斯脉冲情况下分光比、脉冲宽度和连续脉冲个数分别对偏振度与差分群延时关系的影响,并用10 Gbit/s归零/不归零伪随机码序列进行了实验,实验证明了理论推导和理论分析的正确性。

I used the homemade ECDL to measure the 2S-3D two photon transition spectrum of Helium , the advantages are that the expense of homemade ECDL is cheap and have good output power. At the same time, I used the electronic part can be got in the market to manufacture a pulse generator in the experiment, the pulse generator can control the output frequency, the pulse width, the relative phase and also can simultaneously control four sets of systems or instruments need the TTL pulse control. The advantage is that the cost of the pulse generator is cheap and the pulse generator is stable. To isolate the magnetic field I used the magnetic foil to helium cell. I also built a gas discharge system, the switch sequence of this system can be controlled by the pulse generator. Finally I built a detecting system can measure the helium energy state. It is cheap and can be combined with the comb laser system in my laboratory.

本实验是利用一台自制的外腔雷射系统来量测2S-3D的氦原子双光子跃迁,其优点在於自制的外腔雷射之费用非常便宜,也有不错的输出功率,同时在实验中我利用市售的电子零件制作了一台脉冲产生器,可控制输出的频率、脉冲宽度以及相对的相位,且可同时控制四套需要TTL脉冲控制的系统或仪器,优点除了便宜之外,也非常稳定;为了隔绝磁场,利用了磁场隔绝金属箔,我也在实验室中建立了一组气体放电系统,其系统可以用脉冲产生器来控制开关时序,最后,我建造了一个氦原子能阶的量测系统,而且费用低廉,可与本实验室的另外一门研究光梳雷射系统做结合。

I used the homemade ECDL to measure the 2S-3D two photon transition spectrum of Helium , the advantages are that the expense of homemade ECDL is cheap and have good output power. At the same time, I used the electronic part can be got in the market to manufacture a pulse generator in the experiment, the pulse generator can control the output frequency, the pulse width, the relative phase and also can simultaneously control four sets of systems or instruments need the TTL pulse control. The advantage is that the cost of the pulse generator is cheap and the pulse generator is stable. To isolate the magnetic field I used the magnetic foil to helium cell. I also built a gas discharge system, the switch sequence of this system can be controlled by the pulse generator. Finally I built a detecting system can measure the helium energy state.

本实验是利用一台自制的外腔雷射系统来量测2S-3D的氦原子双光子跃迁,其优点在於自制的外腔雷射之费用非常便宜,也有不错的输出功率,同时在实验中我利用市售的电子零件制作了一台脉冲产生器,可控制输出的频率、脉冲宽度以及相对的相位,且可同时控制四套需要TTL脉冲控制的系统或仪器,优点除了便宜之外,也非常稳定;为了隔绝磁场,利用了磁场隔绝金属箔,我也在实验室中建立了一组气体放电系统,其系统可以用脉冲产生器来控制开关时序,最后,我建造了一个氦原子能阶的量测系统,而且费用低廉,可与本实验室的另外一门研究光梳雷射系统做结合。

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Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

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