空間頻率特性 的英文怎麼說

中文拼音 [kōngjiānbīnxìng]
空間頻率特性 英文
optical transfer function
  • : 空Ⅰ形容詞(不包含什麼; 裏面沒有東西或沒有內容; 不切實際的) empty; hollow; void Ⅱ名詞1 (天空) s...
  • : 間Ⅰ名詞1 (中間) between; among 2 (一定的空間或時間里) with a definite time or space 3 (一間...
  • : Ⅰ形容詞(次數多) frequent Ⅱ副詞(屢次) frequently; repeatedly Ⅲ名詞1 [物理學] (物體每秒鐘振動...
  • : 率名詞(比值) rate; ratio; proportion
  • : Ⅰ形容詞(特殊; 超出一般) particular; special; exceptional; unusual Ⅱ副詞1 (特別) especially; v...
  • : Ⅰ名詞1 (性格) nature; character; disposition 2 (性能; 性質) property; quality 3 (性別) sex ...
  • 空間 : space; enclosure; room; blank; interspace
  • 頻率 : frequency; rate
  • 特性 : characteristic(s); character; performance; features; properties; behaviour; response; character...
  1. Cycle frequency - based blind beamforming shows the performance degradation due to cfe ( cyclic frequency error ). an improved algorithm is presented in literature 6, which adopting forgetting factor in estimation cyclic correlation matrix would largely depress the sensitivity of cab to cyclic frequency error. by using this method, the improved algorithms of the c - cab and ecab algorithms are presented in this dissertation

    針對基於循環的盲波束形成演算法對循環誤差cfe ( cyclicfrequencyerror )很敏感而導致演算法能下降的情況,參照文獻[ 6 ]提出的遺忘因子cab演算法,提出了c - cab演算法以及基於的盲波束形成演算法( ecab )的改進演算法。
  2. In this thesis, the concept of " fractal " and the recursive algorithm of fractal structure are depicted. the wavelength - independent character of archimedean spiral antenna and the space filled property of koch monopole are analyzed by the method of moment

    本文介紹了分形的基本概念和分形結構的迭代演算法,採用矩量法分析了阿基米德螺旋天線的無關和koch單極天線的填充
  3. The dissertation firstly discusses the reflectance of euv and soft x - ray in " multilayer system based on classical electrodynamics and optical characteristics of materials. the nns surface roughness in different spatial frequency range is carefully studied since scattering can seriously reduce the reflectance in euv and soft x - ray wavelength region. we discuss representative model of residual stress in

    首先從材料在極紫外、軟x射線波段的光學出發,討論了極紫外、軟x射線在理想和非理想多層膜系中的反射;研究了影響極紫外、軟x射線多層膜反射的表面粗糙度的范圍;重點探討了多層膜殘余應力的典型模型、應力形成機制以及薄膜的形成過程。
  4. The essence of edid is to set up a normal behavior fuzzy sub collection a on the basis of watching the normal system transfer of the privilege process, and set up a fuzzy sub collection b with real time transfer array, then detect with the principle of minimum distance in fuzzy discern method the innovation point of this paper is : put forward the method of edid, can not only reduce efficiently false positive rate and false negative rate, also make real time intrusion detection to become possibility ; have independent and complete character database, according to the classification of monitoring program, design normal behavior and anomaly behavior etc., have raised the strongness of ids ; use tree type structure to preservation the character database, have saved greatly stock space ; in detection invade, carry out frequency prior principle, prior analysis and handling the behavior feature of high frequency in information table, have raised efficiency and the speed of detection, make real time intrusion detection to become possibility ; have at the same time realized anomaly intrusion detection and misuse intrusion detection, have remedied deficiency of unitary detection method

    這種方法的實質是在監控權進程的正常系統調用基礎上建立正常行為模糊子集a ,用檢測到的實時調用序列建立模糊子集b ,然後用模糊識別方法中的最小距離原則進行檢測。本文的創新點是:通過對權進程的系統調用及參數序列的研究,提出了基於euclidean距離的入侵檢測方法edid ,不僅能有效降低漏報和誤報,而且使實時入侵檢測成為可能;設計有獨立而完整的徵數據庫,根據被監控程序的類別,分別設計正常行為、異常行為等,提高了檢測系統的強健和可伸縮徵數據庫按樹型結構存儲,大大節省了存儲;在檢測入侵時,實行度優先原則,優先分析和處理信息表中的高度行為徵,提高檢測的速度和效,使實時入侵檢測成為可能;同時實現了異常入侵檢測和誤用入侵檢測,彌補了單一檢測方法的不足。
  5. According to the guidline, two nd : yag lasers have been designed and set up, one is end - pumped by lower output power ld using a selfoc micro lens, and the other is end - pumped by high output power ld using a pair of lenses are designed, and the characteristics such as output power and power stabilization of both solid - state lasers are investigated. thirdly, when an empty liquid crystal cell is inserted in the cavity of the nd : yag laser pumped by high power ld, the laser can operates in single axial mode. finally, according to the relationship between the laser output power and the longnitudinal a ld - end - pumped nd : yag laser sensor for displacement measurement has been investigated theoretically and demonstrated experimently, the results indicate that when the mean radius of pumping inside the laser cavity is far less than that of the oscilating laser mode, the exponential of the output power is a gauss function of the longitudinal positon of focused spot of ld pumping beam, both the measurement range and the sensitivity are dependent on the incident pumping power, as the incident pumping power is increased, the measurement range is enlarged and the sensitivity is improve d

    本文首先介紹了ld泵浦nd : yag激光器的發展狀況、主要及其應用,從四能級速方程出發,推導了ld泵浦nd : yag激光器的閾值、輸出功和斜效的表達式,並簡述了激光器的工作原理、結構型式和倍方法;其次,以相關的速方程為基礎,提出了ld端面泵浦nd : yag激光器的設計方法,給出了一定泵浦耦合方式下,振蕩光模尺寸、最佳輸出耦合、泵浦光模尺寸、泵浦光焦斑位置等參數的選取依據,以此為依據,設計了自聚焦透鏡耦合小功ld泵浦nd : yag激光器和透鏡組耦合高功ld泵浦nd : yag激光器,對激光器的輸出功和功穩定進行了實驗研究;再次,在帶尾纖輸出的高功ld泵浦nd : yag激光腔內插入一隻液晶盒,觀察到了激光器以單縱模運轉;最後,根據泵浦光焦斑端面位置對激光輸出功的影響規律,提出了ld端面泵浦nd : yag激光位移傳感新方法,並進行了理論和實驗研究,研究結果表明:當激光晶體內泵浦光平均光斑半徑遠小於振西安理工大學碩士學位論文蕩光束腰半徑時,激光輸出功的自然指數與泵浦光焦斑的縱向位置成高斯變化規律,測量范圍和靈敏度依賴于泵浦功,隨著泵浦功的增加,測量范圍擴大,靈敏度提高,當端面泵浦功為7 . 24w (最大輸出功為1 . 926w )時,激光位移傳感器的測量范圍和靈敏度分別是13 . 045mm和0 . 148mw / pm 。
  6. Based on the propagation law of the cross - spectral density function in the space - frequency domain, the properties of polychromatic vector gsm beams through a paraxial optical abcd system are studied. the analytical propagation expressions for the cross - spectral density matrix of vector gsm beams passing through a paraxial optical abcd system are derived, which permits us to study the propagation properties of vector gsm beams, including the propagation - induced polarization changes, effect of the spectrum bandwidth and irradiance distributions in a unique way. there are some applications of the theoretical results

    基於域中交叉譜密度函數的傳輸理論,研究了多色矢量gsm光束通過abcd光學系統傳輸時偏振的變化規律,首次推出了矢量高斯一謝爾模刑fgsm )光束通過近軸abcd光學系統交叉譜密度矩陣的傳輸公式,並對矢量gsm光束傳輸中偏振的變化、譜寬的影響和強度的分佈等進行了統一研究。
  7. In this paper, ansys, the software on finite element analysis, is made use of processing the static and modal analysis on the preliminary models and its " modified ones. by analyzing the results, we can conclude that the stresses on the components of the modified models are tended to equilibration and the location of the branches " brace can also influence stresses and translations on the branches. in addition, the values of the intrinsic frequencies on modified models " are larger than the ones on preliminary models, but the ranges of the frequencies on both models are almost same

    傳統的弧形閘門的支臂結構基本上都是三角架式的,這主要是因為按平面體系進行計算的傳統設計方法忽略了結構的整體及弧形閘門的結構點,設計得比較保守,而實際上,將其改為a型結構也存在可行,本文是利用有限元分析軟體? ? ansys對原模型及修改模型分別進行靜態和固有的計算,通過分析比較其結果可知,支臂改為a型后會使閘門的整體受力趨于均勻,即原模型受力大的部件其應力變小,而原模型受力小的部件其應力會變大;而且a型支臂的支桿在不同的放置位置對支臂的應力和位移變化也有一定的影響。
  8. Also it can effectively solve the main " four - threat " of single radar system. however, there ' s some problems must to be resolved, such as time synchronization, space and phase synchronization, signal processing, and clutter constricting, etc. this thesis concentrates on the time synchronization and phase synchronization of bistatic radar system

    雙基地雷達體制和系統結構上的決定了它在技術上具有不同於傳統雷達的一些點,所以雙基地雷達系統的研製首先需要解決時同步、和相位同步、同步、信號處理、雜波抑制等關鍵技術。
  9. The temporal, spatial and frequency - field characteristics are discussed. the validity of the corresponding empiric formula is analyzed and the atmospheric effects and correction method are investigated in the data analysis of the ground - based observations. the atmospheric effects on the gravity observations are analyzed and detected using the gravity data recorded with the superconducting gravimeters at the global geodynamic project ( ggp ) stations

    利用實測地面氣溫、氣壓資料獲得大氣負荷效應時序列的數值結果,研究大氣影響的時徵,分析經驗公式的有效,研究地面觀測和數據分析大氣影響和改正的方案;利用ggp臺站超導重力觀測資料,分析檢驗大氣重力影響;分析igs臺站大氣位移改正的可能
  10. Being local in space and frequency, and some even compactly supported, wavelets are used to simplify the wave equations in slowly varying nonhomogeneous medium, and transfer the problem of solving two - dimension wave equations into a series of one - dimension problems, after words, the method in 1 can be applied to solve it. as a result, the complexity of the problem and the difficulty in solving it are largely reduced

    利用小波變換在域和域上具有局部點,通過小波展開,把二維非均勻問題轉化為一系列一維非均勻問題,然後利用在(一)中得到的通用計算公式求解,大大降低了問題的復雜和難度。
  11. The some fire control system is an advanced multi - senor short range air defense system, which integrated both x and ka bands searching and tracking radars, laser range finder, combined the control computer of subsystem with the master computer, and applied the technology of data fusion

    摘要某火控系統集兩個波段的搜索雷達、跟蹤雷達和電視跟蹤器、激光測距機於一體,分系統控制處理計算機與系統主計算機相結合,採用了數據融合技術,是一部多傳感器集成的現代化防系統,具有搜索能好、反應時快、抗干擾能力強、自動化程度高、使用能好等點。
  12. We discussed the main characteristic parameters of seismic kinesiology and dynamics of mine engineering fracture zone, including relative amplitude, phase time of wave crest, similarity factor, principal frequency band energy, 3 - d space time gradient and coherent coefficient et al., and puts forward the processing method of 3 - d seismic characteristic parameters about denoise - smoothing, generalization, correlation analysis, characteristic transformation ; and presents the method of pattern recognition of mine engineering fracture zone

    摘要本文從時域、域、三維域介紹了礦山工程裂隙破碎帶主要的地震運動學、動力學屬參數,包括相對振幅、波峰相位時、相似系數、主帶能量、二維梯度和相干系數等,提出了礦山工程裂隙破碎帶三維地震屬的去噪平滑、歸一化、相關分析、徵變換的處理方法以及裂隙破碎帶的模式識別原理與方法,並用實例說明了該方法的應用效果。
  13. It shows that a disadvantag ekists when a crsi is used to measure a step structure in a wavefront, but it is useful to adjust a crsi system with lcslm. 4. according to the didriction effect of an aperture, the spatial resolution of our crsi was analyzed and the transform function of our crsi was calibrated by using the psd method of a step wavefront. and some factors which are associated with the accuracy of our crsi were analyzed too

    四、從光學系統衍射效應的角度分析了本文建立的環路徑向剪切干涉儀的解析度,並利用波前功譜密度的概念對該干涉儀的響應進行了標定,分析了限制該干涉儀測量精度的主要因素以及徑向剪切比與測量精度的關系,並指出了該干涉儀的測量范圍,結果顯示該干涉儀基本上可用於準確測量中低段的波前畸變。
  14. With the characteristics of large ambient noise, very narrow bandwidth, low carrier frequency, great propagation latency and time - space - frequency variant multipath effect ( mpe ), the stochastic ocean channel has demonstrated the greatest complexity and difficulty for underwater acoustic wireless communications. among them multipath effect ( mpe ) is the most difficult obstacle that results in signal fading and inter - symbol interference ( isi )

    但是噪聲高、帶寬窄、載波低、傳輸時延大、多途徑效應隨時??變化等通道都會給有效、可靠的水聲通信帶來很大的麻煩,其中多途徑效應是最主要的困擾因素,它會導致信號幅度衰落和碼干擾。
  15. Based on the nonlinear paraxial equation and b - t theory, a differential equation, which describes the small - scale self - focusing in gain ( loss ) media has been derived. the change rule of the maximal gain frequency, cutoff frequency and integral exponential gain have been analyzed approximately

    我們首先從非線近軸波方程出發,基於b - t理論的思想,在考慮了介質的增益(損耗)的情況下,推導得出了小尺度自聚焦所滿足的微分方程,並通過近似方法分析了最大增長、截止及積分指數增益等的變化規律。
  16. Based on the response theory of an elastic earth to surface loads and the model of the standard atmosphere, the characteristics of changes in the loading effects with time, space and frequency are comprehensively investigated in this dissertation. the numerical results obtained in this study can provide accurate atmospheric correction models for high - precision continuous measurements of the geophysical fields such as gravity, tilt, displacement and strain on the earth ' s surface

    本文基於彈地球對表面負荷的響應理論和標準大氣模型,綜合研究大氣負荷效應的時徵,為地表重力、傾斜、位移和應變等物理場的高精度連續觀測提供精密大氣影響改正模型
  17. Using the feature : there exists distinct edge contour between the characters and the background in color image, we give a color image text extraction algorithm - tea ( text extraction algorithm ), which makes the use of cedo to process edge detection of color image, then, adopts morphologic dilation technology to form region image, and combines the area - growth algorithm to mark the candidate text blocks, finally, determinates the correct text block by analyzing the density of text block and the space frequency feature

    利用彩色圖像文本區域與背景之存在明顯邊緣輪廓的點,本文給出了彩色圖像文本提取演算法? tea ( textextractionalgorithm ) 。該演算法首先利用cedo進行彩色圖像邊緣檢測,然後採用形態學膨脹技術生成區域圖像,並結合區域生長演算法標記候選文本塊,最後通過分析文本塊密度和空間頻率特性來判定真正的文本塊,從而較好地完成了彩色圖像的文本提取。
  18. ( 4 ) designed an image authentication method of semi - fragile watermarking technique based on dwt. we transform the image into wavelet domain and group the four adjacent wavelet coefficients

    ( 4 )由於小波變換具有良好的?局部以及與人眼視覺相符的變換機制,在新一代靜止圖像壓縮標準( jpeg2000 )和運動圖像壓縮標準mpeg - 4中占據了重要位置。
  19. After the image lifting wavelet transformation, its coefficients have some characteristics, for example : the frequency compression characteristic, namely the primitive image energy majority of gathers to the low frequency sub - belt ; spatial compression characteristic, namely high frequency sub - belt energy majority of centralisms in primitive corresponding and so on image edge, outline position ; the coefficient distribution similarity, namely in the

    經提升小波變換后,其系數具有如下:壓縮,即原始圖像的能量大部分聚集到低子帶;壓縮,即高子帶的能量大部分集中在原始圖像的邊緣、輪廓等對應的位置;系數分佈相似,即同一方向上各級子帶系數幅值分佈大體一致。
  20. The small - signal model in main circuit are built by using average circuit model. the relationship of each small signal and efficiency duty cycle are described completely. magnitude - frequency characteristics and phase - frequency characteristics of each main transfer function are got

    本文分析了全橋移相zvspwmdc - dc變換器的基本原理,運用平均等效電路法建立了主電路小信號模型,並詳細分析了各小信號變量與有效占比之的關系,得到了各主要傳遞函數的幅度和相位
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