backscattering 中文意思是什麼

backscattering 解釋
背散射 反散射 反向散射 向後散射
  1. The backscattering results of benchmark targets such as sphere, nasa almond, double ogive are given in this paper, they agree very well with the measurement. these numerical results prove the validity and high accuracy of the present methods

    本文給出了基準目標如導體球、杏仁核、雙橄欖體等的後向散射結果，這些結果均與測量值吻合很好，充分說明了本文方法的高效性。
  2. Based on the fog drop size distribution model of radiation and advection fog, the backscattering characteristics of fog have been investigated and the empirical relations of the radar reflectivity factor and water content or visibility are obtained

    對霧的雷達後向散射特性進行了分析和研究，得到了平流霧和輻射霧的雷達反射因子與含水量和能見度的經驗關系。
  3. The efficient sppc had been performed with 1 - hz - repetition - rate 532nm nanosecond pulses, in which phase conjugate reflectivity as high as 21. 5 % was obtained. when sppc were operated in ce : batio3 with 532nm, 632. 8nm and 790nm cw lasers, the maximum sppc reflectivity of 54. 1 %, 88. 2 % and 80. 5 % were obtained, respectively. unlike the results reported before that four - wave mixing by stimulated photorefractive backscattering ( spb - fwm ) only exists at short wavelengths while four - wave mixing by total internal reflection ( tir - fwm ) only exists at long wavelengths, both of these two mechanisms coexist at all wavelengths from 532nm to 790nm in our experiments

    通過大量的實驗全面研究了ce ： batio _ 3自泵浦位相共軛特性：在低重復頻率（ 1hz ） 、 532nm調q激光泵浦時最高獲得了21 . 5的位相共軛反射率，而此前報道過的建立位相共軛脈沖光最低重復頻率是10hz ；實驗中發現在532nm 790nm波長范圍內，在不同的波長激光泵浦時，同時存在兩種自泵浦位相共軛機制：全內反射?四波混頻（ tir - fwm ）和受激背向散射?四波混頻（ spb - fwm ） ；在連續激光泵浦時，對532nm 、 632 . 8nm和790nm三種波長，最高分別獲得了54 . 1 、 88 . 2和80 . 5的位相共軛反射率；同時還研究了自泵浦位相共軛光的時間穩定性。
  4. A method for estimating the intensity of underwater laser backscattering based on the concept of equal phase volume

    基於等相位體概念的水下激光背向散射強度的估算方法
  5. According to the principle of a new scanning electron microscope and the mechanism of the interaction between electron beam and solid target, the trajectories of an incident electron in a sample are simulated, a simulation program is compiled using the monte carlo method, and the backscattering coefficients corresponding to different parameters of the sem are obtained

    摘要根據新型分析掃描電子顯微鏡的工作原理及載能電子束和固體相互作用原理，利用蒙特卡羅方法模擬入射電子和靶物質的相互作用過程，編制了蒙特卡羅模擬計算程序，獲得了對應不同電鏡工作參數的入射電子背散射率。
  6. The rain area is regarded as a random background medium, and the scattering field and backscattering matrix of the cylinder target in rain are gained. in the coherent case, the power of cylinder target in rain and air and their optimum polarization states are studied by the three - step method

    在研究雨中目標時，本文把雨區看成隨機的背景介質，利用波傳播理論、目標的邊界條件，得出介質圓柱在雨中的散射場、後向散射矩陣，並進行了相關計算。
  7. Backscattering coefficient b

    回散射系數
  8. For parameter a, there is a close relationship exist between a ( 9, sr ) in two different radar incident angle that can be expressed as : with considering the effects of soil texture, we get the final expression of the inversion model : where mv ( t1 ), mv ( t2 ) is volumetric soil moisture content in two different temp, c, d is soil type related parameters, and v ( t1 ), s ( t2 ) is coresponding bare soil radar backscattering coefficients. inversion results show that for the c band hh polarized radarsat scansar data with a range of incidence angle from 20 to 40, the soil moisture change value can be derived with an acceptable accuracy using the above model. the temporal and spatial soil moisture change patterns are associated with rainfall and vegetation cover, as well as the soil hydraulic characteristics

    利用最新發展的電磁波散射模型研究了不同植被覆蓋地表雷達波對地表土壤水分的敏感性，建立了半經驗植被雷達後向散射模型; 2 ） .研究發現在農作物等矮小植被覆蓋地表，植被層直接後向散射與植被類型相關，且在植被生長期，雷達後向散射系數對植被含水量的敏感性要高於對植被高度變化的敏感性; 3 ） .解決了單參數雷達地表土壤水分反演問題中，雷達入射角和地表粗糙度的影響這一難點問題; 4 ） .利用土壤介電模型校正了不同土壤類型對反演地表土壤體積含水量的影響; 5 ） .在以上成果基礎上，建立了完整的單參數雷達地表土壤水分變化探測反演演算法，經地表驗證，模型反演地表土壤水分變化值的精度為rmse = 0
  9. Another effect, caused by a similar kind of backscattering though by a different mechanism, is the glory

    另一類似的反向散射效果雖然是另一機制引致是彩光環。
  10. There may be unreal peaks on backscattering signal curve in themeasurement of optical fiber links by otdr

    用otdr測試光纖線路時，其背向瑞利散射信號曲線上常出現幻峰。
  11. Based on the vector radiative transfer theory and the characteristics of the sar technology, several sub - models for rice backscattering are constructed, including the leaf scattering model, the leaf extinction model, the trunk scattering model, the trunk extinction model and the water reflection model. then an integrated model for the first - order scattering mechanisms of rice, including all the main physical processes, is achieved

    針對合成孔徑雷達sar的技術特點，以水稻為研究對象，從矢量輻射傳輸理論vrt出發，通過模擬水稻主要器官稻葉和稻桿對電磁波的散射衰減作用等物理過程，建立了一套完整的水稻一次後向散射作用的物理模型，用以模擬水稻層的後向散射系數
  12. Test methods of plating and coating thickness by beta backscattering for printed boards

    印製板鍍塗覆層厚度測試方法反向散射法
  13. Using a simple radiative transfer model for vegetation volume scattering and the integral equation model ( ibm ) for surface scattering with the field in situ measurements as the input, we compared the simulated and sar measured backscattering coefficients in different agricultural fields

    特別是在植被覆蓋地表，對其下土壤水分的監測更帶有極大的困難性。因此，利用雷達後向散射系數反演土壤水分必須首先充分理解微波與地表的相互作用過程。
  14. 2 ) radar incidence angle and surface roughness correction : to make radar incidence correction and eliminate the surface roughness effects, a wide range of surface parameters ( soil moisture, surface rms height, correlation length, incidence angle ) was input to the ibm model to simulate the effect of surface roughness and radar incidence angle on the sensitivity of soil moisture to the radar backscattering coefficient. a simple model was established to simulate the effects of incidence angle and surface roughness. 3 ) establishment of soil moisture change inversion model : according to a modified ibm model simulation results, the bare surface backscattering coefficients can be expressed as a funtion of the dielectric component for a given surface roughness when the surface slope greater than 2. 0, which is valid for most nature surface : in above equation, r0 is the surface reflectivity at normal incidence

    本研究中，首先利用基於微波輻射傳輸方程的微波植被模型和積分方程（ iem ）模型模擬了各種地表土壤水分含量情況下，植被覆蓋、地表粗糙度（包括地表均方根高度和相關長度） 、雷達入射角對c波段（頻率4 . 7ghz ）水平極化（ hh ）雷達後向散射系數的影響，在此基礎上，建立模型消除了植被覆蓋、地表粗糙度、及雷達入射角對雷達後向散射的影響，利用多時相50m解析度radarsatscansar雷達後向散射系數圖像反演得到了地表土壤水分變化模式信息。
  15. Study of the preservation of helium implanted in nanocrystal titanium film by enhanced proton backscattering spectrometry

    用增強質子背散射研究注氦納米晶鈦膜中氦的含量
  16. Ultrasonic backscattering from a laplacian distributed rough surface

    拉普拉斯分佈表面超聲背向散射的研究
  17. Determination of elastic constants of cylindrical solidsusing backscattering amplitude spectrum

    用超聲背向散射譜定征柱狀固體的彈性常數
  18. For the clouds over xi ' an region, the quantity calculations of the backscattering cross sections for various reflection mechanism of cloud are dealt with. the results calculated show that the major contributions for the backscattering cross s ection come possibly from average cloud diameter, clear - air and humidity turbulence and also from distributions of cloud particles, especially, at higher frequencies

    再分析了雲的後向散射機理，計算了西安地區雲的後向散射截面；表明影響雲的後向散射截面的主要因素為雲滴平均半徑、大氣濕度湍流及雲粒子分佈，在較高頻率時更顯著。
  19. Guidance for the interpretation of odtr backscattering traces

    Odtr后反射軌跡的說明用指南
  20. Design of a raman backscattering distributed optical fiber temperature sensing system

    光纖分散式喇曼溫度傳感系統設計
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