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second harmonic
相关语句
  二次谐波
     Effects of N Atoms on Second Harmonic Generation of Substituted NH_4H_2PO_4 Salts
     N原子对取代NH_4H_2PO_4盐类晶体的二次谐波发生的影响(英文)
短句来源
     Second harmonic generation in Ti: Mg: LiNbO_3 crystal with 70% conversion efficiency
     Ti∶Mg∶LiNbO_3晶体70%转换效率的二次谐波发生
短句来源
     Second harmonic imaging were performed with ATL HDI 5000 (1.7/3.4 MHz) or HP5500 (1.8/3.6 MHz).
     二次谐波成像用1.7/3.4MHz(ATL-HDI5000)或1.8/3.6MHz(HP5500)。
短句来源
     The results indicate:(1) the optimum conditions for the second harmonic are the phase difference φ=π,and the ratio of the amplitudes a 2/a 1 =1.0;
     结果表明①基波和二次谐波叠加的最佳条件是两者的相位差 φ =π、振幅比a2 /a1=1.0 ;
短句来源
     Relation of Second Harmonic Effect and Structure of New Nonlinear Optical Material Cd(POM)_2Br_2
     新型非线性光学材料Cd(POM)_2Br_2的二次谐波效应与晶体结构的关系
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  “second harmonic”译为未确定词的双语例句
     With anterior wall acoustic density measured to be 8 48±1 48dB(0 0025 ml/kg),11 44±1 58dB(0 005ml/kg),12 66±2 02dB(0 01ml/kg),14 32±2 27dB(0 02ml/kg),respectively,p<0 01.Conclusion:Different doses of FX530 can produce different myocardial contrast presented with second harmonic imaging.
     0.02ml/kg声影强烈。 前壁声学密度分别为8.48±1.48dB(0.0025ml/kg),11.44±1.58dB(0.005ml/kg),12.66±2.02dB(0.01ml/kg),14.32±2.27dB(0.02ml/kg),p<0.01。
短句来源
     Study of the Properties of Second Harmonic Generation in a New Ultraviolet Nonlinear Optical Crystal K_2Al_2B_2O_7
     新型紫外非线性光学晶体K_2Al_2B_2O_7倍频特性研究
短句来源
     Second Harmonic Generation of TEA CO_2 Laser in the AgGaSe_2 Crystal
     在AgGase_2晶体中TEA CO_2激光的倍频产生
短句来源
     Second harmonic generation of TEA CO_2 10.6μm laser light in AgGaS_2 crystals
     TEA CO_2 10.6微米激光在AgGaS_2晶体中的倍频
短句来源
     280.5—289.5nm Second Harmonic Generation in BBO Crystal
     BBO晶体中280.5—289.5nm倍频的产生
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  相似匹配句对
     The second;
     第二,专业设置随波逐流;
短句来源
     Second,
     二是对于?
短句来源
     On the Nondiffvacting Second Harmonic Beam
     非衍射的二次谐波
短句来源
     Study on the characteristics of second harmonic in PTR
     光热辐射技术中二次谐波的特性研究
短句来源
     ON HARMONIC OF VVVF
     交流变频调速(VVVF)的谐波问题
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  second harmonic
Second harmonic generations in aperiodic optical superlattices with finite width and in one-dimensional defective photonic cryst
      
The characteristics of the second harmonic generations (SHGs) in homogeneous and inhomogeneous systems are investigated.
      
The nanostructured transparent glasses that exhibit the optical second harmonic generation (SHG) effect are formed at the early stages of phase separation.
      
Measurements at the combination frequency allows for an improvement of the noise and frequency characteristics as compared to a magnetometer based on the generation of the second harmonic in the superconductor.
      
About the Formation of the Second Harmonic Component of Magnetization under Weak Alternating Exciting Fields
      
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This paper is the second report of a research project concerning the characteristics and evolution of the general circulation in recent ten years. The amplitude and the phase angle are calculated by means of 4-term harmonic analysis for the monthly mean 500mb hight along the 55°N and 35°N lat. from 1951 to 1960. According to the spectral distribution and phase angle, the seasonal variation of the general circulation is discussed. The conclusions are the following:(1)There is a pronounced seasonal course in the...

This paper is the second report of a research project concerning the characteristics and evolution of the general circulation in recent ten years. The amplitude and the phase angle are calculated by means of 4-term harmonic analysis for the monthly mean 500mb hight along the 55°N and 35°N lat. from 1951 to 1960. According to the spectral distribution and phase angle, the seasonal variation of the general circulation is discussed. The conclusions are the following:(1)There is a pronounced seasonal course in the change of amplitudes of first and third harmonic. But this seasonal trend of the first and third harmonic at same latitude is opposite. The seasonal trend of the first or third harmonic at 55°N and 35°N lat. is also opposite. No clearly seasonal variation is revealed for the second harmonic.(2)The change of phase angle shows a regular seasonal course except for second harmonic at 55°N lat.(3)The variation of spectrum from 1951 to 1960 shows that the seasonal variation is different from year to year, but the general trend is the same for all years.(4)The characteristics of the spectrum of transitional seasons are clearly distinct from those of summer and winter, therefore the natural synoptic seasons may be clearly defined. The begining and ending as well as the length and character of the seasons vary from one year to another.(5)The weather anomaly in China has a close connection with the pattern of ultra-long waves in northern hemisphere. This may be shown by examples of July 1954 and 1959, as well as February 1957 and 1960.

本文是作者研究近10年大气环流特征的第二部分。应用1951—1960年北半球500毫巴月平均图,用谐波分析方法计算了历年逐月55°N及35°N上波数1到4(第1到第4)波的振幅及位相角。由此分析了大气环流的季节变化。主要结果如下: 1.第1波及第3波的振幅均有明显的年变程,但趋势彼此相反。另外,第1波或第3波振幅本身在55°N及35°N年变程也相反。第2波振幅年变程不明显。 2.各波的位相角亦有明显而规则的年变程,只有55°N第2波的位相角季节变化不大。 3.从逐年波谱及位相来看,大气环流的季节变化各年虽有不同,但季节的趋势却是每年都一致的。 4.过渡季节的波谱与冬夏截然不同。因此一年可分为4个自然天气季节,但每年季节早晚、长短及特征均有一定差异。 5.北半球超长波特征与我国天气有密切关系,这可以从一些例子来说明,如1954年7月与1959年7月,1957年2月与1960年2月。

A highly deformed oxygen-octahedra group (IO3)-1 such as that found in the iodate has been adapted te explain the second harmonic optical coefficients of the LiIO3 crystal. Calculations have been made on the basis of such an ionic grouping model. Calculated values are in good agreement with the experimental ones, hence the following conclusions:

本文对碘酸盐晶体的倍频效应提出了一个(IO_3)~(-1)离子基团模型,并用(IO_3)~(-1)离子基团的分子轨道计算了α-LiIO_3的倍频系数,计算值和实验值符合得很好。由此得出以下结论:碘酸盐晶体的倍频效应主要由(IO_3)~(-1)离子基团和它的共价键轨道所决定。而在(IO_3)~(-1)离子基团中,对倍频效应作出主要贡献的是碘的孤对电子轨道和氧的|2σ>,|2P_y>轨道。

Based on (MO_6) ionic grouping model as previously proposed in (I), we have calculated the various electro-optical coefficients as well as the optical second harmonic coefficients for LiNbO_3, LiTaO_3, KNbO_3, and BNN crystals. If we assume that the oxygen-octahedra in the crystal lattice of these crystals of O_h symmetry all possess the same energy level and wavefunctions, then the energy level and the wavefunction for LiNbO_3, LiTaO_3, KNbO_3, and BNN erystals of C_(3v), or C_(2v) symmetry can be found...

Based on (MO_6) ionic grouping model as previously proposed in (I), we have calculated the various electro-optical coefficients as well as the optical second harmonic coefficients for LiNbO_3, LiTaO_3, KNbO_3, and BNN crystals. If we assume that the oxygen-octahedra in the crystal lattice of these crystals of O_h symmetry all possess the same energy level and wavefunctions, then the energy level and the wavefunction for LiNbO_3, LiTaO_3, KNbO_3, and BNN erystals of C_(3v), or C_(2v) symmetry can be found upon applying the theory of group representations. Furthermore, by using the ABDP theory, we have calculated their electro-optical and optical second harmonic coefficients. It is interesting to note that without introducing any adjustable parameters the calculated values agree satisfactorily with the experimental data. The dependence of the magnitude and the sign of the optical second harmonic coefficients for these crystals upon the degree of the oxygen-oetahedra distortion has also been interpreted theoretically in this paper. We have thus arrived at the following conclusions:

本文用文献[1]中所提出的(MO_6)离子基团模型,计算LiNbO_3,LiTaO_3,KNbO_3,BNN等晶体的电光和倍频系数。假设在O_h对称时,这些晶体中的氧八面体具有相同的能级和对称波函数,则通过群表示理论就可得到在C_(3ν),(C_2υ)对称性时氧八面体的能级和对称波函数,并进而用ABDP理论计算它们的电光和倍频系数。计算结果和实验符合得相当好。本文并从理论上解释了这些晶体的倍频系数大小、符号和氧八面体畸变间的关系,由此可以得到以下两个结论:(1)畸变氧八面体的离子基团模型不但适用于钙钛矿型材料,同时也适用于钨青铜型、LiNbO_3型材料。(2)在钨青铜型、LiNbO_3型的材料中,仍是“离子键”对电光和倍频效应作出主要贡献,同时由于LiTaO_3的共价键成份比LiNbO_3大,因而LiTaO_3的非线性光学效应比LiNbO_3小。

 
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