長波近似 的英文怎麼說

中文拼音 [zhǎngbōjìnsì]
長波近似 英文
long wave approximation
  • 長 : 長Ⅰ形容詞1 （年紀較大） older; elder; senior 2 （排行最大） eldest; oldest Ⅱ名詞（領導人） chief;...
  • 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...
  • 近 : Ⅰ形容詞1 （空間或時間距離短） near; close 2 （接近） approaching; approximately; close to 3 （親...
  • 長波 : long wave （l. w. ）; kilometer wave; major wave; [氣象學] planetary wave長波段 long-wave band
  • 近似 : approximate; similar; approach; approximation; roughness; propinquity
  1. ( 2 ) the emission spectra of laser ablation metal copper plasma were measured. the detailed mechanism of plume emission of cu plasma was qualitatively explained using a simple model based on excitation of atom and ion in plume arising from inelastic collision between the elemental species and electron with high kinetic energy. under the local thermal equilibrium model, the electronic temperature of copper plasma was deduced to be in the 104 scale by its emission lines

    （ 2 ） cu等離子體光譜：在420 570nm波長范圍內觀測了激光燒蝕cu等離子體的光譜和各發射譜線在等離子體中的空間分佈；比較了激光能量對cu等離子體發射光譜、電子溫度的影響；用局部熱力學平衡（ lte ）近似，測得cu等離子體的電子溫度為104k數量級；在不同背景氣壓下，觀測了激光燒蝕cu等離子體光譜的空間分佈。
  2. A new waveguide made of changing a wide wall of a rectangular waveguide to a uniform curved wall is called conformal waveguide. a kind of expression of approximate solution for domain mode of the new waveguide, including symmetric, unsymmetric arc, parabolic arch, hyperbolic arch, elliptic arch, etc., is constructed by using boundary condition of mental waveguide, variational method and boundary element method. by using the equivalence principle, an approximate calculating formula for equivalent resonant conductance of a narrow longitudinal halfwavelength slot cut in the curved wall of the unsymmetric arcrectangular waveguide is derived, and the result is shown. although this solution is approximate, it can solve the problem in designing the slotted antenna of such conformal waveguide

    把矩形波導一個寬面外突成均勻曲面構成的新波導統稱為共形波導.利用金屬波導邊界條件、變分法、邊界元素法構造這種新波導中主模場的一種近似解表達式，包括曲面橫截線為對稱、非對稱圓弧，拋物線弧，雙曲線弧，橢圓弧等.然後根據等效原理，推導非對稱圓弧矩形波導曲面上窄的縱向半波長縫隙的等效諧振電導的近似計算公式，給出計算曲線.這種解雖然是近似的，但卻能解決這類共形波導縫隙天線的工程設計
  3. The waterfall looks like an atlas of china territory. it ' s acclaimed as the peak of perfection for the fall is usually becoming ice pillar in winter while waterfall in summer

    因24億年左右形成的二長花崗巖斷崖巖壁酷似中國版圖而得名的中國瀑布自陡坎斷崖凌空跌落而下，落差近百米，常年水流飛泄，波逐濤涌，無比壯觀，冬為冰柱，夏為瀑布，令人嘆為觀止。
  4. It is found that the fwm field can cause the asymmetry of electromagnetically induce transparency profile. in addition, the effect of different propagating orientations of probe field on the electromagnetically induced transparency is also discussed. in the molecular multi - level system with the perturbed superposition levels, we discuss the electromagnetically induced transparency, spontaneous emission enhancement, double dark resonance and double electromagnetically induced transparency by using the density matrix equation under weisskopf - winger approximation and dressed - state density matrix equation

    針對實際的實驗條件，考慮了一種影響量子干涉的新的因素-四波混頻場，研究了四波混頻場對雙光子探測的-型能級體系的eit的影響，發現四波混頻場能夠導致雙光子探測的eit線型的不對稱，在此基礎上，討論了不同探測場的傳播方式對eit的影響，針對分子中實際存在的包含有微擾能級的不同多能級系統，我們分別採用綴飾態繪景下的密度矩陣方程和weisskopf - wigner近似下的密度矩陣方程詳細地討論了電磁感應透明、自發輻射的干涉相消和相長、雙暗態共振和雙電磁感應透明現象。
  5. With the increasing light adaptive time, the length of rhabdom trended to be longer and proximal pigment trended to spread more widely, but the variation was smaller in full bright light and short wave ( blue ) light conditions than that in long wave ( red ) light condition

    藍光照條件下感桿束直徑和長度變化與全光照相似，但近端色素的伸展幅度以藍光下條件最大，紅光次之，均大於全（色）光照條件。復眼結構對短波光（藍光）的敏感性高於長波光（紅光） 。
  6. From wave equation, under small signal approximation, a theoretical calculation of shg efficiency and acceptances is presented. according to this, the acceptances of wavelength, period, temperature and incidence angle are calculated. these will guide the experiment and the fabrication of optical supperlattice ( osl )

    2 、從波動方程出發，在小信號近似下，推導了qpm倍頻公式，分析了波矢失配的起因及影響，從理論上推導了波長，周期，溫度和入射角的接收帶寬，討論了占空比對輸出效率的影響，對介質制備及實驗有一定的指導意義。
  7. Abstract : a numerical model for wave propagation in water of varying topography and current is proposed, and time - dependent wave mild - slope equation with a dissipation term and corresponding equivalent governing equations are presented. two different expressions of parabolic approximations for the case of the absence of current are also given and analyzed. examples of numerical simulation for wave transformation in large estuarine water areas are provided

    文摘:提出了水深與流場緩變水域波浪傳播數學模型水流中依賴時間變量並考慮能耗的波浪「緩坡方程」及其等價的控制方程組，分析比較了無水流情況此理論模型與其相應的兩種拋物型近似的差別，提供了長江口波浪變形數值模擬計算工程實例.實例表明，該模型能適應河口三角洲大范圍水域波浪傳播數值計算
  8. Then we get some results : the curves of wavelength tuning properties are shown as a near - linear dependence on the applied voltage, and the tuning rate is larger with the duty - cycle decreasing when the voltage applies on the dual domain ; on the contrary, the - tuning rate is smaller with the duty - cycles decreasing when the voltage applies on the single domain

    得到一些對實驗有指導意思的結果：得出電壓和波長調諧曲線近似呈線性關系，在雙疇加電壓情況下，占空比越小調諧速率越大，而在單疇加電壓情況下，占空比越小調諧速率也越小，剛好與雙疇加電壓的結果相反。
  9. The main reason is that the short - range potential is ignored. 2. we presented the theoretical model of collisional quantum interference on rotational energy transfer in atom - diatom system, using the theories of time dependent born approximation and quantum inelastic scattering, and taking into account not only the long - range interaction potentials, but also short - range interaction potential

    2 .應用含時微擾理論和量子非彈性散射理論，考慮一級含時波恩近似，長程相互作用勢，短程相互作用勢和直線軌跡近似，完善了原子一雙原子分子體系分子轉動能量傳遞中的量子干涉模型。
  10. In this paper, a quasi - 3d model of nearshore wave - induced currents and long waves is established based on the combination of an averaged integration of surface wave - induced currents equation along water depth, a 2d equation for the solution of vertical structures of the currents and a nonlinear parabolic approximate wave reflection - diffraction equation of mild slope

    本文建立了將沿水深積分平均的平面波生流方程和求解波生流垂向結構的二維方程與非線性拋物型近似緩坡波浪折射-繞射傳播方程相結合的完整的準三維的近岸波浪引起的水流及其長波的模型。
  11. It is a pop method to embed watermark in frequency field, in most literature, they embed watermark into the coefficients of fft, dct, or high - frequency of dwt using quantization method, we think that : embedding watermark into the low - frequency of audio signal dwt field can improve the robustness of watermark. the watermark is embedded in the maximum of subsection of approximate component the watermark signal using quantization method, for the same quantization size, the “ noise ” added to the signal is

    在頻率域嵌入水印信息，是目前一種主流的嵌入演算法，在很多文獻中，都是通過量化音頻信號的ftf系數， dct系數，或者是dwt域的高頻系數。我們認為:在小波域內的近似分量（低頻系數）中嵌入水印能夠提高數字水印的魯棒性，通過量化嵌入水印的方法，將水印嵌入到近似分量中每個分段中最大值上，因為這樣對于同一個量化步長，量化對象的幅值越大，所疊加的「噪聲」就越小，從而提高了數字水印的不可感知性。
  12. Some basic methods about the slot ' s electromagnetic scattering are studied and analyzed in this thesis. these methods include the quasi - static approximation formulation applied in 2 - d infinite long slot, the 2 - d slot scattering analysis based on integral equation and the method of moments, a physical basis formulation for a finite - length trough, and a quasi - static approximation combined with travel wave ' s scattering calculated scattering from a 3 - d crack. through many examples, these methods " characteristics are discussed

    本文通過不同的模型研究分析了縫隙電磁散射的多種基本演算法，包括二維無限長窄縫的準靜態公式、基於積分方程和矩量法的二維縫隙的散射分析、有限長直縫散射計算的物理基公式及準靜態近似結合行波散射計算三維縫隙的散射等，並通過算例，討論了這些演算法的特點。
  13. The effectivity of the approximation of rayleigh wave in semi - infinite media to the plane mode in the stator transducer of saw motor with finite thickness ( much bigger than the wavelength of the saw ) is evaluated first time by us

    首次探討了用瑞利波近似表面彈性波馬達定子換能器（厚度遠大於表面彈性波波長）平板振動模式的有效性。
  14. 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

    我們首先從非線性近軸波方程出發，基於b - t理論的思想，在考慮了介質的增益（損耗）特性的情況下，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頻率、截止空間頻率及積分指數增益等的變化規律。
  15. At first, we describe the optical keer effect induced by the 3rd order nonlinear effect, then we introduce the nonlinear paraxial equation and b - t theory. after describing the approximations adopted to arrive at the paraxial equation, the limitations of b - t theory have been identified

    我們首先介紹了三階非線性引起的光克爾效應，由此引出了描述非線性介質中光傳輸的近軸波方程以及用於分析小擾動增長的b - t理論，同時敘述了近軸波方程的近似條件及b - t理論的不足。
  16. The quasi - wavelet numerical solutions of approximate equations for long waves in shallow water

    淺水長波近似方程組的擬小波解
  17. ( 3 ) we successfully derived some exact solitary wave solutions of the nonlinear approximate equations with long waves in shallow water by using the hyperbola function method

    （ 3 ）用雙曲函數法，成功得到了非線性淺水長波近似方程組的精確孤立波解。
  18. In this thesis, we used the q - switched nd : yag laser pulse focused by lens to pump the cr ~ ( 4 + ) : mg _ 2sio _ 4 crystal, with the pump laser pulse duration and energy of 30ns and 50 mj separately, and got the laser pulse with center wavelength, pulse duration and energy of 1. 22 m, 8. 2 ns and 10 mj on the best work condition. on the base of zhangguowei s approximation about gain - switching and the parameter of cr ~ ( 4 + ) : mg _ 2sio _ 4 crystal, we calculated the time characteristics of cr ~ ( 4 + ) : mg _ 2sio _ 4 laser pulse with rate equation by numerical method, obtained the conclusion that the laser pulse duration is only related to the pump energy and cavity length : the larger the pump energy is, the narrower the pulse duration is ; the longer the cavity is, the wider the

    本論文採用調qnd : yag脈沖激光通過透鏡聚焦后縱向抽運cr ~ （ 4 + ） : mg _ 2sio _ 4晶體，抽運光脈沖寬度為30ns 、能量為50mj ，在較佳工作條件下得到了中心波長為1 . 22 m 、脈寬為8 . 2ns 、能量為10mj的激光脈沖;並在張國威分析增益開關時間特性的近似法基礎上，結合實際的cr ~ （ 4 + ） : mg _ 2sio _ 4激光器的相關參數，從速率方程出發，用數值計算的方法更為精確的模擬了cr ~ （ 4 + ） : mg _ 2sio _ 4激光器輸出激光脈沖的時間特性，得出了激光脈寬只與抽運能量、腔長有關的結論，即抽運能量愈大，脈寬越窄;腔長越長，脈寬則愈寬。
  19. We present an approximate universal analytical technique ( e - rla ), based on link independent assumption and rla approach, for the blocking performance analysis of all - optical networks with partial wavelength conversion, fixed routing and random wavelength assignment. the proposed technique can be applied to arbitrary networks with arbitrary wavelength conversion configuration and arbitrary traffic mode

    我們基於鏈路獨立性假設和rla技術提出了部分波長轉換配置方式下波長路由光網路的阻塞性能的通用近似分析方法（ e - rla ） ，該方法擴展了rla的適用范圍，可以適用於任何網路拓撲、任何業務量分佈模式條件下網路中任意鏈路上配置任意數目轉換器情況的研究。
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