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allow transition
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     Connection and Transition
     联系与过渡
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     On Learning Transition
     学习迁移的分析
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     Correlations are proposed for calculating the entrainment rate and the pressure drop at the transition which allow for the presence of two liquid phases.
     提出两液蒸馏的筛板流动工况转变点的雾沫夹带率及板压降的计算式。
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  allow transition
These criteria allow transition from the strength characteristics under uniaxial stress to the strength characteristics under plane stress.
      
We give results on the relative equilibria, periodic orbits and dynamics that may allow transition from the unstable configuration to a stable one via energy dissipation.
      
This model introduces many advanced concepts to allow transition between PD and FD operation dynamically.
      


Crystal field theory has been used to calculate the spin allowed transition of Fe2+ ions with 3d6 configuration in the two substitutional sites of interest in tourmaline, i. e., in b and c-sites which have Cs and C_1 point group respectively, by using Zhao's SCP d-orbit of Fe2+ ion. The transition of Fe~(2+)-Fe3+ ion pairs, (Fe2+[g]-Fe3+)→(Fe2+[e]-Fe3+) which has not previously been studied, is discussed here theoretically. An estimate of the magnitude of the intensity of the three strongly polarized...

Crystal field theory has been used to calculate the spin allowed transition of Fe2+ ions with 3d6 configuration in the two substitutional sites of interest in tourmaline, i. e., in b and c-sites which have Cs and C_1 point group respectively, by using Zhao's SCP d-orbit of Fe2+ ion. The transition of Fe~(2+)-Fe3+ ion pairs, (Fe2+[g]-Fe3+)→(Fe2+[e]-Fe3+) which has not previously been studied, is discussed here theoretically. An estimate of the magnitude of the intensity of the three strongly polarized (E⊥c>>E//c) bands near 9,000cm~(-1),13,800cm~_(-1),15,000cm~(-1) in the near-infrared region is given. The interpretation of the near-infrared absorption spectra of tourmaline is satisfactory.

本文在晶体场理论的基础上,采用Fe~(2+)的自洽场解析近似3d轨道,考虑到电气石中b,c两位置的实际对称性(C_s,C_1),计算了属于3d~6组态的Fe~(2+)在该两位置的自旋允许能谱:用离子对跃迁的观点,从理论上探讨了前人尚未处理过的离子对的(Fe~(2+)(g)-Fe~(3+))→(Fe~(2+)(e)-Fe~(2+))跃迁;并对偏振依赖性很大的三条谱:9000cm~(-1),13800cm~(-1),15000cm~(-1)作了强度估计,较为满意地解释了电气石的近红外光谱。

A new kind of multi-layer structure has been used to prepare the SrS:Ce3+ thin film ACEL devices. The different between this device and conventional ZnS device is that there is a thin layer of pure ZnS,as a barrier layer, sandwiched between the Y2O3 dielectric layer and the SrS:Ce3+ active layer. The SrS phosphor layer was deposited by electron beam evaporation at higher substrate temperature of 350℃.X-ray diffraction analysis indicates that a high degree of crystalline perfection was formed at this temperature....

A new kind of multi-layer structure has been used to prepare the SrS:Ce3+ thin film ACEL devices. The different between this device and conventional ZnS device is that there is a thin layer of pure ZnS,as a barrier layer, sandwiched between the Y2O3 dielectric layer and the SrS:Ce3+ active layer. The SrS phosphor layer was deposited by electron beam evaporation at higher substrate temperature of 350℃.X-ray diffraction analysis indicates that a high degree of crystalline perfection was formed at this temperature. The saturated luminescence brightness observed for SrS:CeCl3 TFEL devices was about 100cd/m2 under 5kHz AC excitation.The B-V and η-V characteristics of the SrS:Ce3+ ACEL decive are similar to the ZnS device. The spectrum of SrS:Ce3+ ACEL thin film consists of many peaks. Comparing the EL spectra of SrS:Ce3+ with the reported CL spectra of SrS:Ce3+ phosphor, it is evident that the two main emission bands having peaks around 490nm and 540nm are due to parity allowed transition of 2D(5d)-2F5/2(4f) and 2D(5d)-2F7/2(4f). To deter- mine the angle dependence of the device, the spectra of different emission angles with normal were measured. The intensities of the peaks change obviously with the angles, but peak positions change a little and there is no change in the number of peaks, these suggest that many dfferent kinds of luminescent centres may have been formed in SrS:Ce3+ ACEL thin film devices.Compare the luminescent properties of SrS:CeCl3 thin film with SrS:CeF3 thin film,we observed that CeCl3 is more efficient than CeF3,but the spectral bands of latter are apparently broader than the bands of former, the reason for this may be that there are some Cl atom escaped from the SrS film at the high temperature of 350℃. It has also been observe that the efficiency of SrS:Ce3+ thin film is higher than the efficiency of ZnS:Ce3+ . The exact mechanism is not clear, but it is likely that SrS provides a suitable surroudings for the excitation of Ce3+ ion.

本文采用了SnO_2/Y_2O_3/ZnS/SrS:Ce~(3+)/ZnS/Y_2O_3/Al这种多层结构制备了SrS:Ce~(3+)薄膜器件,并得到了较亮的蓝色交流电致发光。在5KHz正弦交流电压的激发下,该器件的最大亮度为100cd/m~2左右。讨论了衬底温度与薄膜结晶完整性的关系,认为衬底温度在300—400℃之间有利于获得良好的结晶状态。本文还对SrS:Ce~(3+)薄膜的光谱特性进行了讨论,比较了CeF_3和CeCl_3分别掺杂时,SrS薄膜的发光特性‘发现CeCl_3掺杂较CeF_3掺杂好。同时还看到,SrS:Ce~(3+)薄膜的ACEL亮度和效率较ZnS:Ce~(3+)薄膜要高,认为可能的原因是SrS基质提供了一种适合Ce~(3+)激发的环境。

Reported in this paper are the optical absorption spectra of some naturally-occurring jadeites and diopsides of various colors. The coloration of these minerals is discussed on the basis of ligand field analysis. Both iron and chromium ions can cause the green color of jadeite and ciopside. Samples with low Cr- and relatively high Fe are dark green in bolor, The polarized absorption spectrum of Di-17 indicates that its dark green color is due to the Fe~(2+) (M_1)→Fe~(3+)(M_1) and ligand→metal charge-transfer...

Reported in this paper are the optical absorption spectra of some naturally-occurring jadeites and diopsides of various colors. The coloration of these minerals is discussed on the basis of ligand field analysis. Both iron and chromium ions can cause the green color of jadeite and ciopside. Samples with low Cr- and relatively high Fe are dark green in bolor, The polarized absorption spectrum of Di-17 indicates that its dark green color is due to the Fe~(2+) (M_1)→Fe~(3+)(M_1) and ligand→metal charge-transfer transitions. The emerald green color of the samples with relatively high Cr is mainly determined by the spin-allowed transitions of Cr~(3+) ions in the visible region. The yellow and red colors of jadeites are found closely related to the strong ligand→ metal charge-transfer absorption, i.e., the extension of the low-energy wing of this band to the visible region.

本文报道若干天然硬玉和透辉石的光吸收谱,并在配位场分析的基础上讨论其致色原因。铁离子和铬离子均可使硬玉和透辉石呈现绿色。铬含量低但铁含量较高的样品(如Di-17)呈暗绿色。透辉石(Di-17)的偏振光吸收谱表明,这些样品的颜色与Fe~(2+)(M_1)→Fe~(3+)(M_1)荷移跃迁和配体→金属荷移跃迁密切相关。翠绿色样品含铬量相对地较高,其频色主要取决于Cr~(3+)离子在可见区内的自旋允许跃迁。红色和黄色硬玉的颜色与很强的配体→金属荷移吸收有关。

 
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