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spectral integral
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  谱积分
     It was proposed that a new method based on that double lines were excited by means of laser wavelength scanning and intensity of broad band fluorescence was expressed with spectral integral.
     研究了基于双线扫描激发、谱积分求取宽带荧光强度的LIFS测温方法。
短句来源
     The field distributions in regions of partial reflection, totally internal reflection and critical reflection aie evaluated by this method, and compared with the results from plane wave spectral integral.
     本文以均匀柱面波在平界面上的反射场为例,用复射线展开法计算了时谐地震波及瞬变地震波在部分反射、全反射和临界角过渡区的场分布,并与平面波谱积分结果进行了比较.
短句来源
     In this paper, plane wave spectral integral is used as a standard reference and the "distance" defined by norm in L2 space is introduced as the error function for comparison between the two methods, and then the error characteristics of complex ray expansion appoach for target scattering field computation are obtained. The way to decrease the error and the application range of the complex ray expansion method are also obtained.
     本文以平面波谱积分为散射场计算的参考标准,以L~2空间中由范数定义的距离作为复射线展开法计算结果的误差,从而得到了复射线展开法在目标散射场计算中的误差特性,找到了减小误差的方法并给出这一方法的适用范围。
短句来源
     It is found that there are similarities in terms of spectral integral among the wind input source terms given by Jeffreys, Sverdrup and Munk, and Plant and among the wave breaking dissipation source terms given by Tsikunov,Hasselmann and Philips,although the original forms and the physical considerations of these source terms are significantly different.
     发现Jeffreys ,Sverdrup和Munk以及Plant的风能输入源函数在谱积分意义下具有相似性 ,而Tsikunov ,Hasselmann和Phillips的破波耗散源函数在谱积分意义下也具有相似性 ,尽管这些源函数的原始形式和物理背景显著地不同。
短句来源
     The simplification means that finite summation expression of wave functions can be derived from the former angular spectral integral representation.
     简化的含义是在原来的角谱积分表达式的基础上导出有限和表达式。
短句来源
  谱域积分
     In the process of analysis, the concept of reaction is used toobtain the input impedance in the spectral domain, the spectral integral is calculated by the residuemethod and the integral method through deformed path, and the latter is more effective.
     在分析中,首先应用反应的概念得到输入阻抗的谱域表达式,对谱域积分分别用留数法和变换路径积分法进行计算,经比较发现交换路径积分法是一个更加有效的方法。
短句来源
     A compositive model of electromagnetic scattering by the plate and random rough surface is established in this paper. The primary scattering field of the plate target is represented with a spectral integral of the induced currents.
     建立了平板目标与随机粗糙面的复合散射模型.求解过程包括用板上感应电流的谱域积分表示平板目标的初级散射场;
短句来源
     The spectral integral expression of the transmission power is derived for the characteristic impedance.
     对特征阻抗求解 ,推导了传输功率的谱域积分表达式。
短句来源
  “spectral integral”译为未确定词的双语例句
     Under the first order approximate condition, there was the direct ratio between the coal seam thickness of a typical thin layer and seismic trace spectral integral representation, and it exits the inverse ratio relation with the first order spectral moment method. Only based on the constraint conditions with the some known seam thickness, can and the correction coefficients be gained.
     在一阶近似条件下,典型的低速薄层煤层的厚度与地震记录的频谱积分成正比,与地震子波频谱一阶矩成反比,谱矩法在已有的煤层厚度揭露资料在约束条件下,求得标定系数,利用地震资料反演煤层厚度。
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  spectral integral
The waves are decomposed into their spectra by interchanging the boundary integral and spectral integral or summation for the Green's function.
      
In addition to the usual spectral integral, a constant term appears which modifies the asymptotic behaviour.
      
The propagator is spectrally represented and the square diagram with full propagator insertion is expressed as a spectral integral of square diagrams over an internal mass variable.
      
Based on spectral integral equation formulation, approximate and analytical expression for spatial microstrip current is obtained.
      
We continue the investigation of mesons in terms of the spectral integral equation initiated before for the
      
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Huyghens' principle is extended into complex space by complex ray theory, and a simple method for wave field computation is developed As an example, an isotropic cylindrical seismic wave (harmonic or transient) reflected at a plane interface is considered. The field distributions in regions of partial reflection, totally internal reflection and critical reflection aie evaluated by this method, and compared with the results from plane wave spectral integral. It is shown that complex ray expansion can take...

Huyghens' principle is extended into complex space by complex ray theory, and a simple method for wave field computation is developed As an example, an isotropic cylindrical seismic wave (harmonic or transient) reflected at a plane interface is considered. The field distributions in regions of partial reflection, totally internal reflection and critical reflection aie evaluated by this method, and compared with the results from plane wave spectral integral. It is shown that complex ray expansion can take care of the field singularity in the transition region automatically. Therefore, the method may be employed to deal with the complicated wave-field analyses and syntheses in focal, caustic, and transition regions with simplified numerical calculations.

利用复射线理论将惠更斯原理推广到复空间,发展出一种简便的波场计算方法.本文以均匀柱面波在平界面上的反射场为例,用复射线展开法计算了时谐地震波及瞬变地震波在部分反射、全反射和临界角过渡区的场分布,并与平面波谱积分结果进行了比较.结果表明,用复射线展开法可以自动平滑过渡区反射场的奇异性,因而该方法可直接处理焦点、焦散线和全反射过渡区等复杂的波场分析与综合问题,并可简化数值计算过程.

Huyghens principle is extended into complex space by complex ray theory,and a simple method for wavefield computation is developed.As an example,an isotropiccylindrical wave reflected at a plane interface is considered.The field distributions in re-gions of partial reflection,totally internal reflection and critical reflection are evaluatedby this method,and compared with the results from planewave spectral integral.It isshown that complex Huyghens' principle can uniform the field singularity in the transitionregion...

Huyghens principle is extended into complex space by complex ray theory,and a simple method for wavefield computation is developed.As an example,an isotropiccylindrical wave reflected at a plane interface is considered.The field distributions in re-gions of partial reflection,totally internal reflection and critical reflection are evaluatedby this method,and compared with the results from planewave spectral integral.It isshown that complex Huyghens' principle can uniform the field singularity in the transitionregion automatically.Therefore,the method may be employed to deal with thecomplicated wavefield analyses and syntheses in focus,caustic and transition regions.

利用复射线理论将惠更斯原理推广到复空间,给出一种波场计算的简便方法。本文以均匀柱面地震波在平界面上的反射为例,计算了在部分反射、全反射和临界角过渡区的场分布,并与平面波谱积分解进行了比较。结果表明,用复惠更斯原理可以自动平滑过渡区反射场的奇异性,因而该方法可直接处理焦点、焦散线和全反射过渡区等复杂的波场分析与综合问题。

Na5Eu(MoO4)4 like Na6Eu(WO4)4 is a kind of good stoichiometric host luminescent material having high concentration of Eu3+ and no concentration quenching effect.The power crystals Na5Eu(MoO4)4 and NaEu(MoO4)2 have been synthesized. According to differential thermal and X-ray diffraction analyses, a phase diagram of the system Na2MoO4-Eu2(MoO4)3 has been determined.The methods for synthesizing pure Na5Eu(MoO4)4 and NaEu(MoO4)2 have been determined. It shows that Na5Eu(MoO4)4 will not be dissociated to NaEu(MoO4)2...

Na5Eu(MoO4)4 like Na6Eu(WO4)4 is a kind of good stoichiometric host luminescent material having high concentration of Eu3+ and no concentration quenching effect.The power crystals Na5Eu(MoO4)4 and NaEu(MoO4)2 have been synthesized. According to differential thermal and X-ray diffraction analyses, a phase diagram of the system Na2MoO4-Eu2(MoO4)3 has been determined.The methods for synthesizing pure Na5Eu(MoO4)4 and NaEu(MoO4)2 have been determined. It shows that Na5Eu(MoO4)4 will not be dissociated to NaEu(MoO4)2 when Na2MoO4 is excessive and the ratio of molal concentration of Na2MoO4 to Eu2O3 is more than about 8 : 1 at sintering temperature lower than 700℃.Both of Na5Eu(MoO4)4 and NaEu(MoO4)2 crystallize in the schee-lite structure type and belong to the tetragonal crystal system. The X--ray powder diffraction pattern of NaEu(MoO4)2 was indexed in a"pure" scheelite cell with parameters α = 0.5236nm and c = 1.1439nm (dcalc = 5.24g/cm3, z=2, space group I4,/α). Thus, the entire series of NaEu (MoO4)2 compounds is isostructural. But all of the X-ray powder diffraction lines of Na5Eu(MoO4)4 can only be indexed in the enlarged scheelite cell with parameters α = 1.1439nm and c = 1.1486nm (dcaic= 4.01g/cm3, z=4, space group I41/α). In this paper, the cation distribution in the unit cell of both compounds is discussed.The purity of Na5Eu(MoO4)4 and NaEu(MoO4)2 samples can be determined sensitively by the intensity analysis of main peaks of the two compounds by X-ray diffraction mathod.The excitation and emission spectra of both compounds have been determined. The emission lines belong to 5D0 to 7Fi transitions of Eu 3+ and the main emission peaks of 6D0 to 7F2(E) and 7F2(B) are 617.4 and 613. 1nm for Na5Eu(MoO4)4, and 615.6 and 612.7nm for NaEu (MoO4)2, respectively. According to this, the purity of the two compounds can also be determined by luminescent spectrum method. The emissions of 5D2 to 7Fi and 5D1 to 7Fi of Eu3+ are not observed at room temperature. The reason might be that a strong double or triple phonon nonradiation transition occurs on the transition of 5D1to 5D0 or 5D2 to 5D1, because the energy difference between 5D1 to 6D0 or 5D2 to 5D1 is about twice or triple of streching vibration phonon energy of MoO42-, according to Raman spectrum analyses of these compounds.The spectral integral brightness of Na5Eu(MoO4)4 is much higher than that of Na5Eu(WO4)4 under 365nm excitation at room temperature. In our case, the ratio of the integral brightness of Na5Eu(MoO4)4 to NaEu(MoO4)2 and to Na5Eu(WO4)4 is 3.8:3.2:1.0.

本文研究了化学计量的基质发光材料Na_5Eu(MoO_4)_4和NaEu(MoO_4)_2.它们都属于四方晶系,空间群为I4_(1/α ).NaEu(Mo0_4)_2属于白钨矿(scheelite)结构,一个晶胞中有2个分子式NaEu(MoO_4)_2(z=2);而Na_5Eu(Mo_4O)_4属于类自钨矿(scheelite-like)结构,一个晶胞中有4个分子式Na_5Eu(MoO_4)_4(z=4).X射线衍射确定的晶胞常数,对Na_5Eu(MoO_4)_4,α=1.1439nm和c=1.1486nm(密度d计算=4.01g/cm~3,z=4);对NaEu(MoO_4)_2,α=0.5236nm和c=1.1439nm(密度d_(计算)=5.24g/cm~3,z=2).由差热法和X射线衍射法确定了Na_2MoO_4-Eu_2(MoO_4)_3的相图.Na_5Eu(MoO_4)_4分解为NaEu(MoO_4)_2的温度是700℃.本文确定了制备纯 Na_5Eu(MoO_4)和NaEu(MoO_4)_2的方法,并研究了上述两种材料的激发光谱和发光光谱.确定了用X射线粉末衍射谱和发光光谱鉴别Na_5Eu(MoO...

本文研究了化学计量的基质发光材料Na_5Eu(MoO_4)_4和NaEu(MoO_4)_2.它们都属于四方晶系,空间群为I4_(1/α ).NaEu(Mo0_4)_2属于白钨矿(scheelite)结构,一个晶胞中有2个分子式NaEu(MoO_4)_2(z=2);而Na_5Eu(Mo_4O)_4属于类自钨矿(scheelite-like)结构,一个晶胞中有4个分子式Na_5Eu(MoO_4)_4(z=4).X射线衍射确定的晶胞常数,对Na_5Eu(MoO_4)_4,α=1.1439nm和c=1.1486nm(密度d计算=4.01g/cm~3,z=4);对NaEu(MoO_4)_2,α=0.5236nm和c=1.1439nm(密度d_(计算)=5.24g/cm~3,z=2).由差热法和X射线衍射法确定了Na_2MoO_4-Eu_2(MoO_4)_3的相图.Na_5Eu(MoO_4)_4分解为NaEu(MoO_4)_2的温度是700℃.本文确定了制备纯 Na_5Eu(MoO_4)和NaEu(MoO_4)_2的方法,并研究了上述两种材料的激发光谱和发光光谱.确定了用X射线粉末衍射谱和发光光谱鉴别Na_5Eu(MoO_4)_4和NaEu(MoO_4)_2的方法.在365nm紫外光激发下,Na_5Eu(MoO_4)_4的发光比Na_5Eu(WO_4)_4的强得多,在室温下,Na_5Eu(MoO_4)_4,NaEu(MoO_4)_2和Na_5Eu(WO_4)_4的相对发光积分亮度比为3.8:3.2:1.0.

 
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