fourier inverse transform 中文意思是什麼

fourier inverse transform 解釋
傅里葉反變換
  • fourier : n 1 傅立葉〈姓氏〉。2 Francois Marie Charles Fourier 弗朗瓦斯馬利沙利傅立葉〈1772 1837，法國空想...
  • inverse : adj 相反的；逆的；翻轉的，倒轉的。 an inverse network 倒置（電）網路。 inverse time 逆時，反時。 ...
  • transform : vt （使）變形；（使）變化[轉化，轉變]；變態，改變（性質、機能等），改造，改革；【數學】變換；【電...
  1. Sequentially, the author discussed the technologies of medical image 3d visualization according to the clinical applications. with the development of computer, 3d visualization and computer graphics, the 3d visualization of medical images has progressed from fourier transform and convolve inverse projection to mpr ( multi - planar reformation, mpr ) and mtp ( maximum intensity projection, mtp ), nowadays, the real 3d reconstruction method, surface and volume rendering has risen. the image registering, image segmentation, pixel data set construction and 3d special interpolation are the key technologies in medical images 3d reconstruction

    隨著計算機技術、三維可視化理論和計算機圖形學的發展，醫學圖像的三維可視化技術也從傅立葉變換、卷積反投影等基本圖像處理演算法，發展到真正的三維重建演算法：面繪制和體繪制；醫學圖像的三維可視化技術的應用也從三維醫學成像發展到虛擬內窺鏡，以及今天的虛擬可視化人體研究；而圖像的配準、圖像分割、體數據集的構建、三維空間插值則是醫學圖像三維可視化實現過程中的關鍵技術環節。
  2. Aapproximation of fourier inverse integral using fourier transform approximation for amplitude of harmonics in a finite fourier series summation

    富氏級數中之諧波成份以富氏轉換近似並以有限級數和近似富氏逆轉換。
  3. Moreover, the signal processing method of high range resolution based on inverse discrete fourier transform is analyzed. the synthetic high range resolution of the several scatters is simulated

    此外，本文還闡述了頻率步進信號的逆傅立葉變換合成距離高分辨的處理方法，並對多散射點目標的合成距離高分辨效果進行了計算機模擬。
  4. Images of huanghua pears were acquired by means of machine vision system the method to describe the shape of irregular fruit was studied, in which the fourier transform and fourier inverse transform were applied a sort of software for fruit shape identification based on artificial neural network was developed

    利用機器視覺採集黃花梨圖像，研究了不規則果品的形狀描述方法，提出在黃花梨的分級過程中採用傅立葉變換與傅立葉反變換對來描述果形，開發了基於人工神經網路的果形識別軟體。
  5. The sizing method based on fraunhofer diffraction is limited. because of the limitation of size parameter a ? 1 and size of photodetector, it ca n ' t measure the particles less than 5 microns accurately. to extending lower limit of measurement, inverse - fourier - transform technique is discussed

    利用夫朗和費衍射理論時對粒子的界定要求尺寸參數a 1 ，又加上光電探測元件的尺寸受到限制，故不能準確地測量5微米以下的顆粒，為此必需擴大測量下限。
  6. Thus the resistance factor and vibration modes of the soil layer are obtained and used to analysis the pile response. by considering the interaction between the soil layer and the pile with boundary condition of continuity of displacement and equilibrium of force at the interface of soil layer and pile, the dynamic equilibrium equation of pile is solved and an analytical solution for the pile response in frequency domain is yielded, which is used to define complex stiffness and mobility at the level of the pile head. based on the convolution theorem and inverse fourier transform, a semi - analytical solution of velocity response in time - domain subjected to a semi - sine exciting force is given

    首先通過引入勢函數方法對土體位移進行分解，從而將土體動力平衡方程解耦，求解得到了土層的振動模態和阻抗因子，然後利用該解以小應變條件下樁土接觸面上力平衡和位移連續條件來考慮樁土耦合作用，求解樁的動力平衡方程，得到了樁頂的頻域響應解析解、復剛度和速度導納，利用卷積定理和傅里葉逆變換，求得了半正弦脈沖激振力作用下樁頂速度時域響應半解析解。
  7. The fields at any point, especially at the points in the middle field region, are reconstructed by using the theory of the plane wave and the inverse fast fourier transform in this thesis

    論文根據平面波譜的展開理論和傅立葉反變換首次給出了在空間任意點，特別是中場區，的場分佈。
  8. As an implementing method of multi - carrier modulation ( mcm ), discrete multi - tone ( dmt ) modulation uses inverse discrete fourier transform ( idft ) vector as its modulating vector, and discrete " fourier transibrm ( dft ) vector as its demodulating vector, and the process of modulating and demodulating can be realized by using their fast calculating method

    作為多載波調制的一種實現形式，離散多音頻（ dmt ）調制分別採用逆傅立葉變換矢量和傅立葉變換矢量作為調制矢量和解調矢量，從而調制和解調過程可以利用這兩種變換的快速演算法實現。
  9. The main work and achievements are summarized as follows : according to the spectrum analysis theory, the simple formula of the power spectrum between the excitation and the response is obtained. then the time - domain statistical properties of the structural response are acquired through fourier inverse transform, and cauchy ' s residue theorem is applied to solving the integral of fourier inverse transform, the structural dynamic reliability is calculated in terms of possion hypothesis based on first passage failure

    主要研究內容如下：從譜分析理論出發，得到了激勵與響應功率譜之間的簡明關系式，由fourier逆變換得到響應的時域特徵，利用cauchy留數理論處理fourier逆變換的積分式，基於首超破壞的possion假設計算結構系統的動力可靠性，並在此基礎上進行結構優化設計，奠定了確定性模型的基礎。
  10. Generalized voigt model was used to simulate the visco - elastic property of soil surrounding pile and the relationship between settlement and time of pile embedded in layered soil was investigated. a corresponding semi - analytical solution was obtained by laplace transform method and fourier inverse method. the parameters in the generalized voigt model were connected with the conventional geotechnical parameters of soil and the behavior of pile settlement was then analyzed and discussed

    進而借鑒樁基動力分析中的平面應變模型參數的取值方法，將廣義voigt體模型中的參數與土體的基本物理力學參數相聯系，使得參數的選取具有一定的確定性和準確性，並進一步分析討論了各參數的變化對單樁沉降性狀的影響。
  11. The influence of soil on the pile was simulated by voigt model according to the layered characteristic of soil surrounding the pile. the semi - analytical solution for the relationship between the pile head settlement and time was obtained by laplace transform method and fourier inverse method. by using the solution, the influence of all relevant parameters on the pile settlement behavior was investigated and discussed

    成層廣義voigt體地基中單樁沉降的時間效應研究將成層地基中每一層土對樁的作用簡化為廣義voigt體模型，由此建立了單樁的靜力平衡方程，並求解得到了成層地基中靜荷載下單樁樁頂沉降在拉普拉斯變換域的解析解和在時間域的半解析解。
  12. Firstly, the discrete multi - tone processing in an adsl central office - side interface card is detailedly introduced. the processing mainly includes timing, framing, interleaving, forward error correction, cyclic redundancy check, constellation encoding, inverse fast fourier transform processing, prefixing, d / a converting, and amplifying. secondly, a kind of interface named utopia level 2 is used as the network interface, with which many adsl devices are linked with one atm layer

    本文比較詳細地闡述了數字用戶線接入模塊（ dslam ）開發方案中， adsl局端介面模塊的dmt編碼與調制過程，討論了其組網應用方式以及基於atm的網路側介面utopia2技術，分析了adsl與其它寬帶接入技術的相互聯系和優缺點，並介紹了方案中所採用的一些關鍵技術，包括在線插拔技術、系統同步啟動和故障自動重起技術以及高速數字信號完整性的保證技術等等。
  13. The system is composed of inverse - fourier - transform system, optic fiber sensor and high sensitivity ccd. its software system of signal acquisition and data processing used the platform of virtual instrument labview. we tested system stability and investigated latex particle size from 32nm to 123nm, several phenomenon below have been found : ( 1 ) the experiment result is consistent with the theoretical arithmetic result of the relation between particle size and normalization light scattering energy at the position of 7 ? and 35 ? angle

    組建了包括反傅立葉變換系統、光纖傳感器以及高靈敏度ccd的大角度側向光散射信號探測系統，設計了基於虛擬儀器labview平臺的信號採集和數據處理軟體，對系統穩定性和顆粒尺寸從32納米- 123納米的微乳液顆粒球進行了測試研究，發現以下現象： （ 1 ）在與光軸成7和35夾角的位置，歸一化的散射光能量與粒徑大小關系的實驗結果跟理論分析規律完全一致。
  14. A new algorithm of calculating inverse order for fast fourier - transform

    計算倒位序的新演算法
  15. 4. with the consideration of practical soil - pile interaction, the soil around pile is modeled as a three - dimensional viscous - elastic continuous medium and the time effect of the settlement of single pile is studied. the semi - analytical solutions for vertical displacement of soil and for the relationship between settlement of pile head and time were obtained by laplace transform method and fourier inverse method, and the law of the settlement of pile head varying with time was then analyzed and discussed

    考慮樁土藕合作用的單樁沉降時間效應研究從研究空間軸對稱問題的角度出發，將樁周土體建模為三維粘彈性連續介質，更為合理地考慮了靜荷載下樁土系統中單樁與樁周土的藕合作用，分別建立了樁周土體和樁體的靜力平衡方程，並通過拉普拉斯變換、傅立葉逆變換等數學手段，獲得了單樁樁周土體的垂直變形和樁頂沉降在拉普拉斯變換域內的解析解和在時間域內的半解析解，進而分析討論了單樁沉降隨時間變化的規律。
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