side spectrum 中文意思是什麼
side spectrum
解釋
二次光譜-
A large planar microphone array, which consists of 111 microphones, was successfully applied to obtain a two - dimensional mapping of the sound sources on a landing aircraft. the focus of study in this paper is on the landing gear noise source. the spectra, directivities and sound pressure levels of flap side - edge noise of 7 narrow - board commercial aircraft and 7 wide - board commercial aircraft are presented. it is found that the landing gear noise spectrum is broadband with some single tones in some cases. the directivity of the total sound pressure level of a landing gear noise resembles that of a horizontal dipole. the level differences between the various aircraft landing gears are larger than those expected from the airspeed differences. it is thus expected that the louder noise emission of the landing gears can be reduced by redesigning
應用由111個傳聲器組成的平面傳聲器陣列對當前流行的民用客機進場著陸過程中的機體噪聲源進行了實驗測量，本文對七架窄體客機和七架寬體客機的起落架噪聲進行了分析，得到了起落架噪聲的頻譜特性、指向特性和聲級變化.研究發現，起落架噪聲的頻譜是由寬頻隨機噪聲與一些較為明顯的單音噪聲源組成，起落架噪聲的指向性類似於一個水平放置的偶極子.不同飛機起落架噪聲的聲級相差較大，這說明可以通過重新結構設計降低起落架噪聲。 -
Results and conclusions flos trolli is a kind of valuable phytogeniantimicrobial agent with wide antimicrobial spectrum, notable effect, few side effect
結果與結論金蓮花是很有價值的植物抗菌藥，它抗菌譜廣、作用顯著、不良反應小，金蓮花屬植物應用前景廣闊。 -
Abstract : a large planar microphone array, which consists of 111 microphones, was successfully applied to obtain a two - dimensional mapping of the sound sources on a landing aircraft. the focus of study in this paper is on the landing gear noise source. the spectra, directivities and sound pressure levels of flap side - edge noise of 7 narrow - board commercial aircraft and 7 wide - board commercial aircraft are presented. it is found that the landing gear noise spectrum is broadband with some single tones in some cases. the directivity of the total sound pressure level of a landing gear noise resembles that of a horizontal dipole. the level differences between the various aircraft landing gears are larger than those expected from the airspeed differences. it is thus expected that the louder noise emission of the landing gears can be reduced by redesigning
文摘:應用由111個傳聲器組成的平面傳聲器陣列對當前流行的民用客機進場著陸過程中的機體噪聲源進行了實驗測量，本文對七架窄體客機和七架寬體客機的起落架噪聲進行了分析，得到了起落架噪聲的頻譜特性、指向特性和聲級變化.研究發現，起落架噪聲的頻譜是由寬頻隨機噪聲與一些較為明顯的單音噪聲源組成，起落架噪聲的指向性類似於一個水平放置的偶極子.不同飛機起落架噪聲的聲級相差較大，這說明可以通過重新結構設計降低起落架噪聲。 -
Some valuable conclusions are summarized by theoretical analysis and simulation experiments : from the side of signal processing, pulse jamming can be deleted by the method of time - domain sliding window accumulation and can be restored by interpolative prediction. ; gauss white nose can be attenuated while jamming disperse point - target by the method of time - frequency analysis in time - frequency domain. ; radio frequency noise jamming can be deleted by the method of average range frequency spectrum and notching in frequency domain
通過大量的理論分析和模擬實驗，得到了一批具有一定價值的結論：從信號處理的角度出發，對于脈沖式干擾，能夠運用時域滑動窗口積累的方法去掉，並且通過預測插值得到較好的恢復；對于高斯白噪聲干擾，在時頻變換域內應用時頻分析方法可減小其對分散點目標的干擾；對于射頻噪聲，通過平均距離頻頻法和頻域陷波的方法可以去掉；從改變合成孔徑雷達系統角度出發，類似雙基地雷達能夠避免各種干擾，對發射信號進行調幅，調相以及改變調頻斜率都是較好的抗干擾方法。 -
Spread spectrum communication is paid more attention to the advantage of good message privacy, antijamming and mutiple access in the world, it shows strong vitality on the side of measuring distance, antenna measure, mine communication, tactics communication, muti - access application, mobile communication and so on
擴展頻譜通信以其保密性好、抗干擾能力強、多址性等優點成為目前世界上廣為受重視的一種通信技術，它在測距、天線測量、礦井通信、戰術通信、多址應用、移動通信等方面都顯示了強大的生命力。 -
This article discusses the vehicular short - wave single - channel direction finding system and gives a new direction finding algorithm based on signal spectrum correlation, to improve the system ' s performance to when coping with single side band signals
文中針對車載短波單通道測向系統，提出了一種新的基於信號譜相關的測向演算法，改善了系統對單邊帶信號的測向性能。 -
Two angiogenesis inhibitors have been developed that have a broad spectrum of anticancer activity, yet virtually no side effects
目前，已有兩種具有廣譜抗腫瘤活性且無明顯副作用的血管生成抑制劑面世。 -
On the other side of the spectrum are diagrams like organizational charts, venn diagrams, or interlocking gears that connote a very specific meaning for the information they portray
該改進的另外一面是如組織圖的圖表，維恩圖或者連鎖齒輪，表達著信息描繪的特殊意義。
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