Effects of Winter Irrigation on Soil Water-heat-salt Migration and Crop Growth During Freezing-Thawing Period in Qingtongxia Irrigation District of Ningxia [PDF]
, 2023 [Objective] The effects of winter irrigation on soil water-heat-salt migration and crop growth during the freezing-thawing period were analyzed in order to provide a scientific basis for controlling soil salinization, and to ensure food security ...
Han Yuping +4 more
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Study on the effect of gallium nitride low noise amplifier based on high power microwave pulse injection [PDF]
ObjectiveThis paper discusses the damage characteristics of gallium nitride (GaN)-based low-noise amplifiers (LNA) under high power microwave (HPM) pulses.
Anru LÜ +6 more
core +1 more source
Dianci bileiqi, 2023 针对线天线耦合核电磁脉冲产生感应过电压对接收机造成损害的问题，基于瞬变电场与天线接收理论，利用理论与实验相结合的方法，采用有界波模拟器模拟2.3/23 ns电场波形，选用频段420 MHz～550 MHz的线天线进行电磁脉冲耦合实验。实验结果表明：频段为420 MHz～550 MHz的线天线对核电磁脉冲的耦合电压波形为阻尼振荡波型；耦合核电磁脉冲的频段主要集中在0 MHz～130 MHz;耦合电压峰值随着电场强度的增加呈线性增长趋势。分析试验数据 ...
李祥超, 王兵, 文巧莉, 欧阳文
doaj
Design and Calibration of Electron Stack Spectrometer for Diagnosing Hot Electron Temperature in Intense Laser-plasma Interactions [PDF]
The interaction of relativistic intense lasers with matter generates complex plasma environments characterized by extreme conditions, such as high temperatures and densities, which are critical to fields like laser-driven inertial confinement fusion (ICF)
BO Nan1, 2, TIAN Baoxian2, WANG Haoran3, 4, WANG Naiyan2
core +1 more source
Recognition method of digital modulation signals over non-Gaussian noise in cognitive radio [PDF]
, 2014 In cognitive radio system,the traditional methods of digital modulation signals recognition with Alpha stable distribution noise have the problems of poor performance and high computation complexity.A novel recognition method based on correlation ...
Bing-bing LI +3 more
core +1 more source
Single-channel amplitude-comparison wideband direction finding method with nonuniform time modulation [PDF]
ObjectiveTo overcome the problem of the limitation of working bandwidth due to the phase ambiguity caused by the carrier frequency's variation in conventional time-modulated direction finding, a single-channel direction finding method with nonuniform ...
Dapeng BIAN +4 more
core +1 more source
Study on preparation and electromagnetic shielding properties of silver-coated ferrosilicochrome powder [PDF]
ObjectiveThis study focuses on the preparation and properties of high-performance electromagnetic shielding materials for electronic equipment in marine environments.
Junzhi WU +4 more
core +1 more source
Ray-based simulation method of ground-penetrating radar signals [PDF]
, 2006 探地雷达（简称GPR）是一种高效的地下介质无损检测方法，它通过发射高频电磁脉冲波，利用地下介质电性参数的差异，根据回波的振幅、波形和频率等运动学和动力学特征来分析和推断介质结构和物性特征，具有探测速度快、非破坏性、分辨率高、可进行数据实时成像处理等优点，在水文、工程、环境等领域已取得广泛的应用。而探地雷达的数值模拟是整个雷达成像方法的关键。对雷达图像作数值模拟，有助于加深对雷达反射剖面特征的认识，为实测雷达剖面的解释提供依据，这也是探地雷达技术中的一个难点。本文针对探地雷达的数值模拟问题进行了详细研究 ...
李峰
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Dianci bileiqi, 2023 针对同轴线耦合强电磁脉冲产生感应过电压和耦合能量对后端电子设备造成损伤的问题，笔者基于对强电磁脉冲耦合路径及损坏形式的研究，再借助有界波模拟器模拟高空核爆产生核电磁脉冲对同轴线进行耦合试验，通过对同轴线终端耦合到的峰值电压、能量以及频谱的定量分析，进而设计出3级防护电路对线缆终端进行防护。耦合试验结果表明：同轴线耦合强电磁脉冲的波形呈阻尼振荡波形，对数据拟合反推得到强电磁脉冲空间电场强度为50 kV/m时，耦合到的电压峰值在39 V左右，且线缆终端耦合能量量级会对高于一些后端敏感性器件损伤阈值 ...
李祥超 +4 more
doaj
Research on Competitive Strategy of YiXing CO.,Ltd [PDF]
, 2009 在竞争日益激烈的福建人防设备市场上，益兴公司面临着众多的机会与威胁。制定一个切实可行的竞争战略已经成为企业亟待解决的问题。如果不能制定有效的竞争战略，严峻的竞争形势和紧缩的市场压力将使其直接面临生存危机。 本文就是在上述背景下展开研究的。本文首先介绍了人防工程的概念、产业特点和发展趋势，然后用PEST模型对益兴公司所处的行业环境进行了分析和评价，并介绍了当前福建人防设备市场的竞争状况，认为益兴公司面临着政府新法规的支持、经济发展稳定等发展机会，同时面临着竞争对手的激烈竞争和新竞争对手加入等威胁；其次 ...
程礼炜
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