水下聲波 的英文怎麼說

中文拼音 [shuǐxiàshēngbō]
水下聲波 英文
underwater sound wave
  • 水 : 名詞1 （由兩個氫原子和一個氧原子結合而成的液體） water 2 （河流） river 3 （指江、河、湖、海、洋...
  • 下 : 下動詞1. （用在動詞后,表示由高處到低處） 2. （用在動詞后, 表示有空間, 能容納） 3. （用在動詞后, 表示動作的完成或結果）
  • 波 : Ⅰ名詞1 （波浪） wave 2 [物理學] （振動傳播的過程） wave 3 （意外變化） an unexpected turn of even...
  1. Digital speech technology has been widely used in many fields of communications in recent years, but it is just at beginning to use acoustical wave to implement underwater digital speech communications, which mainly results from the bandwidth - limited underwater acoustic communications channel and its high temporal and spatial variability

    目前，數字語音技術已廣泛應用於許多通信領域，但是在水下利用聲波進行數字語音通信卻是剛剛起步的新技術，這主要是由於水聲通道有限的通信帶寬及其時變、空變等特性所決定的。
  2. Through the inspecting, the author selected three methods of eradiate noise ' s feature extraction. the methods include the pedigree, e - filter, fractal. in those methods, the pedigree is based on frequency field, the e - filter is based on the energy field and the fractal is based on time field

    本文作者經過考察，採用了三種前期研究中較為有效的水下目標特徵提取方法? ?基於功率譜估計的線譜特徵提取方法、基於小波分析的不同頻段內能量特徵提取方法和基於水聲信號分維特性的特徵提取方法。
  3. The following results were found, i. e., the water ratio affects obviously the acoustic wave velocity of rock sample ; the wave velocity is higher in saturated rock samples than in unsaturated ones ; and it decreases gradually with the strain of samples during uniaxial compression ; and also with the lengthening holding time at 160 ; when heating the samples the acoustic wave velocity increases slightly in initial stage and comes to the peak value at 60, then decreases gradually with increasing temperature ; meantime, there is a certain temperature effect on rock samples size

    實驗發現含水率對波速影響比較大，飽和巖樣的聲波傳播速度高於不飽和巖樣的聲波傳播速度；人工預制裂紋對聲波傳播速度影響不大；單軸壓縮條件下，聲波傳播速度隨應變增加逐漸降低；在同一溫度（ 160 ）下，波速隨保溫時間的增加而逐漸降低；在對巖樣逐漸加熱情況下，初始加熱階段波速略有升高，當溫度達到60時，巖樣波速達到峰值，之後隨著溫度繼續升高其波速逐漸下降；波速隨溫度變化具有一定的尺寸效應。
  4. In this paper, the main research works are as follows : 1 ) survey and analysis previous work in auv navigation and summarize : as the cumulate error, the dead - reckoning and inertial navigation systems ca n ' t be used without other modified system ; the acoustic navigation system is used only in small range, and is very expensive. 2 ) two important approaches in geophysical navigation techniques are summarized, one is terrain contour based navigation, this approach is investigated keystone today ; the other is image based navigation, due to no perfect image sensors and image seabed map, this approach has seldom been practised. 3 ) two important terrain contour based navigation algorithms has been applied to auv, one is match algorithm - based terrain contour match ( tercom ) ; the other is kalman filter - based sandia inertia terrain - aided navigation ( sitan )

    主要研究內容包括：一、總結分析了當前水下導航的常用方法和不足之處，指出基於航位推算的導航方法，存在著最大的問題就是導航誤差的積累問題，如果沒有修正系統，這種方法很難滿足使用要求；其次指出基於聲學的導航方法，造價昂貴，導航范圍有限，難以滿足自主水下航行器大范圍導航的需求；二、總結了當前水下地形輔助導航的主要技術路線，一是基於地形高程的匹配方法，這是當前研究的重點；二是基於地形圖像的匹配方法，由於缺乏良好的圖像傳感器，和可用的海底圖像地圖，目前這種方法還有待研究發展；三、將兩種地形高程匹配的常用方法應用到自主水下航行器上：以相關演算法為前提的地形輪廓匹配（ tercom ）方法和以卡爾曼濾波為基礎的桑迪亞慣性地形輔助導航（ sitan ）方法，前者演算法簡單可靠，但是導航精度不高，後者雖然精度比較高，但存在著演算法較為復雜、有可能發散和出現奇異值等問題。
  5. Joint analysis of radiated noise from underwater vehicles based on wavelets and bispectrum

    水下目標輻射噪聲的子波變換和雙譜聯合分析
  6. It implies that gene expression in plant cells might have changed under the stimulation of sound wave. thirdly, the cell cycle of protoplast of control group and stimulated group ( stimulating for 9 days ) was estimated by flow cytometer. the results showed that the number of cells of stimulated group decreased in g0 / g1 phase and increased in s phase

    圍繞中心法則分別測定了dna 、 rna和可溶蛋白質的含量，發現聲波刺激組的dna含量變化不明顯，而rna和可溶蛋白質的含量都有所升高，且以刺激9天的實驗組最為突出，表明在強聲波的作用下，有關應力響應的轉錄因子被啟動，轉錄水平提高，從而翻譯合成較多的蛋白質，促進植物的生長發育。
  7. The mine - hunting sonar system is produced in such a condition, and it defines the torpedo ' s position by use of sound wave emit by the sonar array which is installed on the bottom of the ship

    獵雷聲納就是在這樣的情況下誕生的。它是利用安裝在船底部聲納基陣腔內的聲納發射的聲波，經目標反射后成像在顯示屏上，從而確定水雷的存在及位置。
  8. Spurt water column not only is a good coupling medium of ultrasonic, but also can get rid of impurity, such as power, vapor and oil film on the surface of the measured object, so this sensor can adapt various environments

    因為水柱不僅是超聲波傳播的良好介質，還可將被測物表面的粉塵、水汽、油膜等雜質吹走，使系統具有良好的環境適應能力。在惡劣環境下進行位移測量時，該傳感器具有其他儀器不可比擬的優越性。
  9. ( 5 ) mfpic ( matched field postbeamformer interference canceller ) is proposed to cancel tow ship ' s noise. the advantage of mfpic is that it can be used to cancel the tow ship ' s noise for all arrival directions. furthermore, this new approach can be used to detect weak target, which has the same bearing angle of a strong interference

    （ 5 ）將平面波波束形成后干擾抵消與匹配場處理技術進行有機結合，探索性地提出了拖線陣聲納本艦干擾的匹配場抵消方法和匹配場處理后的干擾抵消方法，為本艦多途干擾抵消、水面強干擾抑制和水下弱目標檢測提供了新的技術途徑。
  10. The underwater - radio buoy for use as obtaining the ocean " s acoustical parameters is a underwater acoustic signals record system which has long distance radio remote control and data transmit function. the technology key of the dissertation study is that under the requirements of the system the monitor and record equipment on the acoustic source vessel, the monitor and record equipment on control vessel command and control the work slate of the buoy system by radio data transmitting mode of short wave transmitter - receiver

    海洋環境參數獲取浮標監測系統屬于具有長距離無線電遙控?數傳功能的水下聲信號接收記錄系統，本論文研究目標的技術關鍵在於根據系統要求，指揮船和發射船監控記錄設備通過短波電臺以無線數傳方式，對浮標系統的工作狀態進行指揮和控制，浮標則通過同一短波通道向指揮船上報浮標方位、工作狀態、關鍵數據及非常狀態下的報警信號等。
  11. Researchers at the florida institute for human and machine cognition envision their work giving army rangers 360 - degree unobstructed vision at night and allowing navy seals to sense sonar in their heads while maintaining normal vision underwater - - turning sci - fi into reality

    佛羅里達人與機械認知研究所的研究人員設想他們能夠將科幻變為現實為陸軍突擊隊員提供夜間360度全方位無阻礙的感知；使在水下的海豹特種部隊用他們的腦袋來感覺到聲波，同時不會丟失普通的感覺。
  12. We select a common feature in the image - edge of the object as our research content and from this point we spread our work including the contrast enhancing technologies, using mathematical morphology to restrain noises in image, extracting of the geometric primitives, dwt in edge detection and the border thinning and tracing technologies

    我們重點針對圖像物體的最直觀特徵?邊緣進行研究，以此為出發點，研究了包括水下圖像對比度增強，利用同態學進行水下圖像噪聲去除，直線和橢圓基元的提取，利用小波變換進行邊緣提取以及基於多邊形近似原則的邊緣追蹤技術在內的各種演算法。
  13. Application of acoustic measuring of concrete quality under water in downstream of yunfeng dam

    聲波測試在雲峰大壩水下混凝土質量檢測中的應用
  14. In order to be applicable to practical underwater systems, several kinds of the blind beamforming algorithms were discussed in this thesis, and direction - of - arrival ( doa ) estimation based on bbf is also discussed

    針對水下聲系統的應用背景，本文對盲波束形成演算法做了系統的分析與討論，並對基於盲波束形成的目標波達方向估計進行了研究。
  15. The sparker was originally developed for fundamental studies of underwater sound propagation and of subbottom geology.

    火花發生器原來是為了進行關於水下聲波傳播及海底地質的基礎性研究而製造的。
  16. Underwater acoustic receiving system

    水下聲波接收系統
  17. Firstly, the ray method and normal mode method are used to calculate the acoustic field in underwater with the source in the air

    首先，用射線方法和簡正波方法對空氣中的聲源在水下產生的聲場進行了分析。
  18. Knowing the bottom parameters, the influence of the mismatch of the bottom parameters for the inverted water sound speed and the relationship of the statistical distribution between bottom parameters errors and inverted water sound speed errors are studied using modal wave number tomography scheme

    應用簡正波波數層析方法，在海底參數已知的條件下，研究了海底參數失配對反演的水體聲速的影響，以及海底參數誤差分佈與反演的水體聲速誤差分佈的關系。
  19. A three - dimensional - acoustic doppler velocimeter is used to measure the velocity components of the flow field in all three coordinate directions for different discharge and measurement site. the influence of measurement site and the depth / vegetation height ratio on the measured velocity profile and turbulence intensity and the renolds stress is analyzed. the characteristics of the measured velocity distributions and the results of the previous investigators are used to select an analytical expression for the shape of the velocity profile

    利用三維超聲波多普勒流速儀（ adv ）量測不同位置、不同流量下的瞬時流場。分析了測點位置和水深與植被高度比對時均流速分佈的影響。本文還給出了種樹段紊動強度及雷諾應力的垂線分佈。
  20. This thesis researches the design and implementation of underwater high - speed multi - channel data acquisition and processing system. there are some contents to be presented including designing a set of noise signal generator ; design and implementation of underwater nosie high - speed multi - channel data acquisition and processing system ; programming the windows 2000 device driver cl pci and usb with ddk2000 ; programming user interface of the control of the acquisition and display of the image with vc + + 6. 0

    本論文對高速多通道採集和處理系統的設計和實現進行了研究，論文的主要研究工作包括：設計一套模擬噪聲源；根據水下目標輻射噪聲的檢測和識別要求進行了高速多通道採集和處理系統的設計和實現研究；完成了相應的pci 、 usbwindows2000驅動程序的開發；使用vc + + 6 . 0編寫了採集控制和波形顯示界面。
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