V - vlf 中文 - EN166

vlf vlf ＝ very low frequency 【無線...

vlora
For few domestic and international studies of the radio propagation in the overburden of the earth ' s crust , this paper theoretically stresses the propagation problem of low frequency radio wave , including slf wave and vlf wave , in the medium and briefly introduces the theory of scale model testing method 針對國內外有關電波在地殼覆蓋層中傳播研究工作的空白，本文主要從理論上討論低頻（包括特低頻和甚低頻）無線電波在該種介質中的傳播問題，并簡要介紹縮比模型測量理論。
A brief introduction of synthetic aperture radar ( sar ) and the application of sar image data in the research of crest length distribution is introduced . the method to compute the action of random waves with different crest lengths on vlfs . is also reviewed 對星載合成孔徑雷達及其在波峰長度統計特性研究中的應用以及不同波峰長度海浪對超大型海上結構物的作用作了一個簡單的介紹，闡明了下一步的研究工作的思路。
We found that tf and vlf / lf by using the 2 methods are great different with healthy person . more than 15 minute signal should be sampled for analyzing spectrum . analyzing 5 minute hrv ( decubitus ) for 10 hyperthyroibism sickness by using ar and fft 對4例女性心肌缺血病人臥姿5分鐘hrv信號分別采用fft和現代譜估計得到的功率譜進行統計，發現總功率tf和vlf / hf與正常人相應年齡段有較大差異。
In this dissertation , the progress in the researches of spatial coherence of random waves is reviewed . based on this , studies have been carried out for the statistical characteristics of crest lengths and their influence on vlfs 本文回顧總結了近年來國內外有關海浪空間特征量統計研究的進展，并在此基礎上，開展了隨機海浪波峰長度統計特征及其對海上結構物影響的研究。
The dimension of the very large floating structures ( vlfs ) is usually more than 1km . the design of such giant structures must consider the spatial coherence of waves . crest length is one of the main parameters in wave coherence 超大型海上浮體結構( vlfs )的尺寸通常以千米計，對于如此尺度的結構，作為主要環境因素的海浪必須考慮其在空間上的不均勻性。
We found that vlf / lf of hyper thyroibism sickness by using the 2 methods in are high than healthy person . study hrv wd , when using choi - williams window to restrain cross disturb , setting filter parameter a = 0 . 05 本文還對心率變異信號的維格納分布作了研究，選用choi - williams窗，確定了濾波函數的參數= 0 . 05 ，實際證明抑制交叉項的干擾效果較好。
In the middle of the atlantic ocean , with a salinity of 3 . 2 % , a vlf signal will penetrate down to a depth of 10 - 20 meter , barely periscope - depth for a modern large scale submarine 在大西洋中部，海水的鹽度為3 . 2 % ，甚低頻無線電信號可以穿透到海面下10 ~ 20米的深度，幾乎就是現代大型潛艇的潛望鏡深度。
It is infered signal length is short , the spectrum resolving power is low by using fft method , so the vlf % and lf % by using 2 method has great difference 推測由于5分鐘hrv信號點數較少， fft分析時分辨率不高，因此兩種方法所得極低頻vlf和低頻lf有較大差異。
The vlf / hf by using ar presents trend of increasing , this is tallied with clinic . analyzing 5 minute hrv ( decubitus ) for 4 myocardial ifchemia sickness by using ar and fft 現代譜估計所得的vlf / hf比值隨年齡( 20歲)增加基本呈現增加的趨勢，與臨床認識吻合。
Abstract : the vlf through - the - earth communication system is recognized as the most reliable way of conveying dispatching information due to its special transmission media 文摘:由于大地信道穩定，低頻透地通信被認為是最可靠的救急通信方式。
Out in the no - mans land of the international waters are the only means of communication with the submarines , to use radio in the vlf or elf range 在茫茫大洋深處，唯一可用的通信手段就是甚低頻或者極低頻無線電。
Comparison of modal function expansion method with eigenfunction expansion method for prediction of hydroelastic responses of vlfs 預報超大型浮體水彈性響應的模態函數展開方法和特征函數展開方法比較
Experimental research of the hydroelastic response of box - typed vlfs in non - uniform sea environment 箱式超大型浮體在非均勻海洋環境下的水彈性試驗
Application of vlf - em method in mineral exploration of longtoushan ag - pb - zn deposit 甚低頻電磁法在龍頭山多金屬礦床勘查中應用
Vlf radio navigation system 甚低頻無線電導航系統
Methods of measurement of electrical performance for lf vlf transmiters 低頻甚低頻發射機電性能測量方法
Hydroelastic analysis of vlfs using plate green function method 超大型浮體水彈性分析的平板格林函數法