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Instantaneous frequency and wave mode identification in a magnetosheath using few spatial points被引量：2
《Chinese Physics B》2013年第8期496-501,共6页Nathaniel E U Beloff N George N J 
Observational data such as those obtained from the magnetosheath in the downstream of Earth＇s bow shock have waveforms that differ from those of sinusoidal signals. In practice, they are not even aggregates of sinuso...
关键词：EMD-Hilbert transform instantaneous frequency and wave vector 
Fatigue behavior of aluminum stiffened plate subjected to random vibration loading被引量：7
《Transactions of Nonferrous Metals Society of China》2014年第5期1331-1336,共6页胡海涛 李玉龙 索涛 赵峰 苗应刚 薛璞 邓琼 
Project(10932008)supported by the National Natural Science Foundation of China;Project(B07050)supported by the Program of Introducing Talents of Discipline to Universities(111 Project),China;Project(2012GY2-26)supported by the Key Industry Program of Shaanxi Province,China
Vibration tests were carried out on three types of stiffened aluminum plates with fully clamped boundaries under random base excitation. During the test, the response of the specimens was monitored using strain gauges...
关键词：stiffened plate vibration fatigue vibration test fatigue life natural frequency 
DISTRIBUTION　OF　LOW　FREQUENCY　WAVES　IN　NORTH　PACIFIC　AND　INTRASEASONAL　ABNORMALITY　OF　THE　WESTERN　PACIFIC　SUBTROPICAL　HIGH被引量：1
《Journal of Tropical Meteorology》1996年第2期171-180,共10页李兴亮 喻世华 
By using ECMWF (2. 5°×2. 5°) grid data, analyzing correlation for the summer (June-August) of 1980 (the West Pacific Subtropical High (WPSH) anomalously more to the south), 1988 (the WPSH anomalously more to the no...
关键词：LOW FREQUENCY wave SUBTROPICAL high ABNORMALITY NORTH PACIFIC 
几个影响室内土动力试验的重要试验参数被引量：1
《防灾减灾工程学报》2005年第4期446-450,共5页黎冰 高玉峰 刘汉龙 朱伟 
国家自然科学基金资助项目(50479020)
室内土动力试验是研究土动力特性的重要方法之一,其结果受到很多试验参数的影响,其中加载频率、应变速率(加载速率)、加载类型和循环次数是4个重要的试验参数,也是目前国内外的研究热点。总结了国内外关于这4个试验参数对土动力特性影...
关键词：频率 应变速率 加载类型 循环次数 
基于光纤网络数字视频传输系统设计与实现被引量：3
《仪器仪表用户》2006年第6期39-40,共2页刘志刚 邬春学 杨春 
本文提出了一种针对分布式监控点,进行网络化集中管理平台的构建方法。简述了组网结构和整个网络体系中数据流图,并就传输模块和播放模块提出了各自的软件实现算法;在长江公路大桥监控管理实践中成功构建实现了上述平台,使大桥各个监控...
关键词：MPEG-4 光纤传输 数字视频 
Semi-blind Channel Estimation in MIMO-OFDM Systems without Guard Interval and Virtual Carriers
《Chinese Journal of Electronics》2007年第1期190-192,共3页ZUO Zhidong ZHANG Hailin 
Multiple input multiple output-orthogonal frequency division multiplexing （MIMO-OFDM） systems use multiple antennas both at the transmitter and the receiver, which can increase the channel capacity and provide high ...
关键词：Multiple input multiple output Orthogonal frequency division multiplexing Channel estimation SUBSPACE Cyclic prefix Virtual carriers. 
Uncertainty analysis of strain modal parameters by Bayesian method using frequency response function被引量：3
《Earthquake Engineering and Engineering Vibration》2007年第2期183-189,共7页徐丽 易伟建 易志华 
Ministry of Construction of China through the Science and Technique Program Grant No.06-k6-13;Guangzhou Construction Technological Development Foundation through Grant No.200409;Guangdong Province Natural Science Foundation through Grant No.5300381 ;Guangzhou Science and Technique Bureau through Science and Technique Program Grant No.2006J1-C0451
Structural strain modes are able to detect changes in local structural performance, but errors are inevitably intermixed in the measured data. In this paper, strain modal parameters are considered as random variables,...
关键词：frequency response function UNCERTAINTY strain mode Bayesian method local damage damage detection concrete flame 
A wideband low power low phase noise dual-modulus prescaler被引量：2
《Journal of Semiconductors》2011年第2期130-136,共7页雷雪梅 王志功 王科平 
This paper describes a novel divide-by-32/33 dual-modulus prescaler （DMP）. Here, a new combination of DFF has been introduced in the DMP. By means of the cooperation and coordination among three types, DFF, SCL, TPS...
关键词：dual-modulus prescaler WIDEBAND low power low phase noise frequency synthesizer multi-standard radio 
基于整词离析度和离析形式常用度的动宾离合词离析教学被引量：1
《国际汉语教学研究》2017年第3期52-61,共10页孟凯 王丽丽 
教育部人文社会科学青年基金项目(16YJC740052);北京语言大学梧桐创新项目(中央高校基本科研业务费专项资金;17PT02)资助
本文在全面考察常用动宾离合词离析形式的基础上,对离析使用率、离析形式的总量和类别量三项指标进行综合考量,划分出动宾离合词的高、中、低三级离析度;基于整词的离析度和离析形式的常用度,以"睡觉"为例,提供了具有可操作性的动宾离...
关键词：离合词 对外汉语教学 离析形式 离析度 常用度 
Structure optimization of connection frames based on frequency sensitivity in macro-micro motion platforms被引量：1
《Nanotechnology and Precision Engineering》2019年第1期40-47,共8页Lufan Zhang Xueli Li Haihong Zhang Haixin Li Hu Li Jun Wu 
financially supported by the National Natural Science Foundation of China (Grant No. 51705132);the Science and Technology Department of Henan Province Natural Science Project (Grant No. 172102210215);Henan Postdoctoral Foundation, doctoral Foundation (2016BS008);the Education Department of Henan Province Natural Science Project (Grant No. 17A460008)
High-performance connection frames are of great significance for ultra-high acceleration and ultra-precision positioning in macro-micro motion platforms. This paper first takes the connection frame as a research objec...
关键词：Ultra-high ACCELERATION CONNECTION FRAME NATURAL frequency Sensitivity Structure optimization 
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