脉冲波

LDoS (low-rate denial-of-service) attacks are stealthier and trickier than the traditional DDoS attacks. According to the characteristic of periodicity and short burst in LDoS flows, a detectionsystem DSBWA (detection system based on wavelet analysis) against LDoS attacks has been designed andimplemented based on feature extraction using wavelet transform.

低速率拒绝服务攻击(low-rate denial-of-service，简称LDoS)比传统的DDoS攻击更具隐蔽性和欺骗性，依据其周期性脉冲突发特点，设计实现了一种基于小波特征提取的LDoS 检测系统DSBWA(detection system based on wavelet analysis)。

The OOW shall grasp all about the radars to be used, such as, the width of pulse to be used, the maximum and minimum detectable distances, the resolutions for distance and azimuth, and other characteristics of the instruments in order to make a correct judgment on the image information.

值班驾驶员必须完全掌握要使用的雷达，如：要使用的脉冲宽度，最大和最小探测距离，方位和距离的分辨率，和设备的其它特点，以便对回波作出正确判断。

It not only includes the "highly resemble" jamming signals generation by adding distance, azimuth, velocity and envelop deceiving information to the original captured radar transmitted pulse, but also includes the "covering" jamming signal generation by an modulation which will get an unmatched processing result in the radar receiver's match filter.

提出&高逼真欺骗干扰&和&掩护式欺骗干扰&的概念，详细阐述了&预警雷达高逼真及掩护式欺骗干扰技术&的原理，具体内容包括对雷达实现距离、方位、速度、幅度起伏等&高逼真&欺骗信息调制，以及利用脉冲压缩失配法产生多目标干扰回波以完成&掩护式&欺骗信息调制。

In this method, wavelet is used to extract fault characteristics and neural network is used to diagnose the faults; the inputs and outputs of the neural network are all memberships concretely, the inputs are the memberships of the crest factor, pulse factor, margin factor, bias factor, kurtosis factor and maximum spectrum on each characteristic domain, and the outputs are memberships of each fault.

即利用小波变换获取特征域，取特征域上的峰值因子、脉冲因子、裕度因子、偏态因子、峭度因子及频谱最大值作为神经网络的输入，并对神经网络的输入、输出进行模糊化处理，以神经网络进行诊断。

Introduces the height finding theory of the continuous wave frequency modulation altimeter and the pulse radar altimeter,analyzes the reason why the two kinds of altimeters were used in complex terrain to cause errors,and also gives out the experiment result that the plane mounted with the two kinds of altimeters flew in complex terrain section occasion.

介绍了调频连续波高度表和脉冲雷达高度表的测高原理，分析了两种体制高度表在复杂地形下使用时产生误差的原因，并且给出了两种高度表在复杂地形剖面场合下的机载试验结果。

Methods The lateral nuclear on amygdale basement of SD rats was stimulated by a constant current intensity of 500 A for 10 s every 30 min,10 times a day for 2 days,which was used for stimulus in the amygdale rapid kindling protocol.

方法利用频率60Hz，波宽1.0ms，串长10s，串间间隔30min，每天10次，连续2d，电流强度500A的恒流脉冲电刺激SD大鼠单侧杏仁基底外侧核。点燃后1个月给予同样强度1s电刺激，观察模型稳定情况。

Computers, however, do not store data as continuos waves; they store and manipulate discrete pulses.

然而，计算机并不能以连续波的形式存储数据，计算机存储和处理离散脉冲。

To this end the original 'Blue Fox' radar is replaced by Ferranti 'Blue Vixen' coherent pulse-Doppler track-while-scan radar to improve acquisition and look-down capabilities, and other improvements are a MIL 1553B digital databus (making it possible to carry Sea Eagle anti-ship and ALARM anti-radar missiles) and the installation of the Marconi Sky Guardian 200 RWR, the JTIDS for secure voice and data links, two additional underwing hardpoints, wing tip stations for two AIM-9 Sidewinder short-range AAMs, wing improvements, a revised cockpit with HOTAS controls, larger drop tanks, provision for 25 mm Aden 25 cannon in place of the elderly 30 mm weapons, and possibly a Plessey missile-approach warning system.

为实现这一目的，原有的&蓝狐&雷达被新型的&蓝雌狐&连续波脉冲多普勒雷达替换，该雷达具有搜索的同时锁定目标的能力，可下视下射。其他改进包括加装军用1553B数据链，这使得MK2可以使用&海鹰&反舰导弹和ALARM反雷达导弹。另外加装了马可尼&天空哨兵200&通信系统，JTIDS保密语音及数据链路。增加了两个翼下外挂点，翼尖挂架可携带两枚AIM-9&响尾蛇&近距空空导弹。细节的改进还包括：机翼设计有所改进；改进的座舱设计；更大的副油箱；采用阿登25mm机关炮代替了以往的30mm机炮；可能加装了导弹告警系统。

Based on the ring-shaped laser-diode array side-pumped Nd:YLF high gain amplifier and the conventional plan-concave resonator, a simple structure single-longitudinal-mode single-pulse Q-switched oscillator is demonstrated by taking advantages of mode-selecting property of passive Q-switches (Cr4+:YAG crystal) and etalons (formed by two end of uncoated Nd:YLF rod).

以激光二极管环形阵列侧面抽运Nd：YLF棒高增益放大器模块为基础，在经典的平凹驻波腔中加入一片Cr4+：YAG晶体作为被动Q开关，利用被动Q开关本身所具有的振荡选模功能以及两端不镀膜的Nd：YLF棒所具有的标准具效应，简便地实现了稳定的单脉冲、单纵模调Q输出。

The calculation results predict that the background gas in the tube is one but not the most important factor resulting in pulse shortening, and in order to broaden the pulse width of the gas-filled RBWO, the pressure of the filled gas must be controlled in a proper value.

从计算结果可以看出，器件内残留的中性背景气体是产生脉冲缩短的原因之一，但并不是最重要的因素；对于充气的相对论返波管，为了展宽脉宽，充气气压必须控制在一个适当的水平。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。