基于整形飞秒激光脉冲泵浦光电导天线的宽带太赫兹辐射研究

飞秒激光脉冲泵浦光电导天线可以产生宽带太赫兹脉冲辐射。采用具有缓慢上升-快速下降整形脉冲包络的飞秒激光脉冲与光电导天线作用产生宽带太赫兹辐射,基于Drude-Lorentz模型计算了太赫兹辐射的规律,并讨论了激光脉冲脉宽和半导体载流子寿命对太赫兹辐射产生的影响。研究结果表明,尽管这种整形飞秒激光脉冲的能量有所损失,但是这种泵浦方式能够比普通飞秒激光脉冲泵浦光电导天线产生更宽的太赫兹辐射。该结果为实验上基于光电导天线产生宽带太赫兹脉冲辐射提供了新的思路     

A Test Study of 50% Lightning on Rod-Plane Gap with Impulse Breakdown Voltage Two-Phase Mixture of Gas and Solid Particles

A test study on 50% lightning impulse breakdown voltage in two-phase mixture of gas and solid particles has been carried out in a specially designed discharge cabinet. A mechanical sieve is set up for sifting different solid particles into the discharge space uniformly. The lightning impulse voltage according with international electro-technical commission （IEC） standard is applied to the electrodes inside the discharge cabinet by the rule of up-down method in a total of 40 times. The results showed that the 50% lightning impulse breakdown voltage in two-phase mixture of gas and solid particles has its own features and is much different from that in air.     

关于二次雷达与ADS-B广播式自动相关监视的对比研究

二次雷达在空管业务中扮演着管制员“眼睛”的角色,对航空事业的发展意义非凡。ADS-B作为近年来出现的新技术,对航空管制与机场地面监视同样具有积极的推动意义。ADS-B（automatic dependent surveillance-broadcast）是一种空中交通监视应用,通过数据链广播模式,周期性的传递飞行参数,空中交通管制单位可以获取这些信息用于空中管制服务。本文通过详细对比二次雷达与ADS-B技术的优缺点,探讨两者的发展前景。     

利用邻接结构熵确定超网络关键节点

识别网络中的关键节点对研究网络的拓扑结构及功能特性具有重要的实际应用价值.基于超图的超网络拓扑结构为超图,由于超图中的超边可以包含任意数量的节点,使得超网络能够清晰明了地表达出多元、多维、多准则的复杂关系.为了更好地挖掘超网络中的关键节点,基于超图理论及性质,提出超图中的邻接结构熵识别超网络中的关键节点,该方法通过研究...     

Research on Nanosecond Pulse Corona Discharge with Cross Magnetic Field Applied

An application of magnetic field to the nanosecond pulse corona discharge is investigated. A cylinder reactor with different corona electrodes is set up for experimental study. A magnetic field with its direction perpendicular to the corona discharge is applied. Different discharge images are taken under single nanosecond pulse with a high sensitive UV-visible light imagine recorder. Experimental results show that with a cross magnetic field the nanosecond corona discharge both generates paths and develops homogeneously in space more than that without the magnetic field. The results may lead to a possibility to apply a cross magnetic field on nanosecond pulse corona discharge for getting higher desulfurization efficiency.     

Research on Nanosecond Pulse Corona Discharge Attenuation

A line-to-plate reactor was set-up in the experimental study on the application of nanosecond pulsed corona discharge plasma technology in environmental pollution control. Investigation on the attenuation and distortion of the amplitude of the pulse wave front and the discharge image as well as the waveform along the corona wire was conducted. The results show that the wave front decreases sharply during the corona discharge along the corona wire. The higher the amplitude of the applied pulse is, the more the amplitude of the wave front decreased. The wave attenuation responds in a lower corona discharge inversely. To get a higher efficiency of the line-to-plate reactor a sharp attenuation of the corona has to be considered in practical design.     

BFRP格栅增强混凝土板接触爆炸特性试验研究

为研究BFRP格栅对混凝土板抗爆性能的增强作用,对3种BFRP格栅增强混凝土板开展了5种TNT装药量下的接触爆炸试验.对不同装药量下构件的破坏特征进行了对比分析,确定了3种构件的临界贯穿装药量范围.结果表明,BFRP格栅对混凝土构件抗爆特性的增强作用主要体现在背爆面的震塌效应.当震塌局部剥落时,剥落区的体积随格栅尺寸减...     

利用节点传播熵识别超网络重要节点

超网络中识别重要节点是一项基础且具有挑战性的重要课题，相关研究对进一步分析网络拓扑结构和功能特性具有广泛的应用价值。为了突破已有的重要节点识别方法评估的局限性，利用超图及信息熵理论，提出一种基于节点传播熵的超网络重要节点识别方法。该方法兼顾节点的局部和全局拓扑信息，利用节点聚集系数和邻居数目表征节点信息的局部传播影响，通过节点间最短路径和K壳中心性反映节点信息的全局传播影响，充分考虑节点自身及其邻域节点的影响，最终利用节点传播熵来表征节点在网络中的重要性。并通过单调性、鲁棒性以及SIR传播模型评价标准，在六个来自不同领域的真实网络上与其他方法进行比较，实验结果表明，该方法能够准确有效地识别网络中的重要节点。     

小世界超网络传播模型及实证分析

借鉴WS小世界网络的构造算法，在超网络(也称为超图)中加入超边随机重连，构建小世界超网络模型。以该模型为信息传播的底层网络，提出小世界超网络SIR信息传播模型，仿真模拟超边随机重连概率、超网络中的邻居节点数量以及传播率、恢复率等参数对超网络的信息传播过程影响，并与普通网络中的传播过程进行了对比分析，发现超网络中的信息传播速度更快，波及范围更广。进一步，在3类实证超网络上验证了超网络的小世界特性及信息传播规律。在万物互联时代，世界变得更小的背景下，对现实世界中更为复杂的信息与疾病传播机制的深入研究具有一定的借鉴意义。