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lattice symmetry
相关语句
  晶格对称
     The results show that the lattice symmetry and the shapes of the air holes can affect band gap size.
     结果表明,晶格对称结构和空气孔形状对带隙大小有影响.
短句来源
     Given a lattice symmetry,larger absolute photonic band gap was achieved by selecting an air hole shape of the same symmetry.
     给定晶格对称结构,选择具有相同对称形状的空气孔能得到较大的绝对光子带隙.
短句来源
  “lattice symmetry”译为未确定词的双语例句
     With a size reduction, α-Fe_2O_3 nanocrystals showed a lattice expansion and an enlarged axial ratio of c/a that is in apparent contradiction to the previous conjecture of high lattice symmetry for α- Fe_2O_3 nanocrystals at small sizes.
     这一结论明显的与早期文献研究的结果不同,这些研究认为在小粒径时,α-Fe_2O_3具有高的晶格对称性。 对纳米α-Fe_2O_3的表面水合作用的研究发现,表面水合作用与粒径有强烈的依赖关系,粒径越小,其表面水合作用越强。
短句来源
     XRD indicates that the sample is wurtzite(hexagonal) structured ZnO with lattice constants of a=3.249 ,c=5.206  and lattice symmetry group(S.G)of P63mc(186). SEM shows that the length,the width and the thickness of the battens are about 20 micrometer,50~300 nanometer and 30 micrometer,respectively.
     XRD谱表明该条板六方晶系结构,格点对称群为P63mc(186),格点参数a=3.249,C=5.505 2.SEM图表明该ZnO纳米板条的长度大约为20μm、宽度为50~300nm,厚度约为30nm.
短句来源
     The lattice symmetry of La1-xSrxFe03 system changes from orthorhombic to rhombohedral lattice. La1-xSrxFe1-yCoy03 system has rhombohedral lattice.
     合成的La_(1-x)Sr_xFeO_3样品由正交晶系向菱方晶系转变,La_(1-x)Sr_xFe_(1-y)Co_yO_3(x=0.2;y=0.2,0.4)样品为菱方钙钛矿氧化物结构。
短句来源
     With the concentration of Eu2+ increasing, lattice symmetry increase, electron cloud deformation possibility weaken, and finally the number of luminescent centers reduces. These will result in luminescent concentration quenching.
     分析表明随Eu2+浓度增加,晶胞对称性提高、形变力减弱造成发光中心数量减少,结果造成发光的浓度猝灭。
短句来源
     The analyses indicate that the crystals are single-phase with I4/mmm tetragonal lattice symmetry. As the strontium concentration increases, the parameter a prac-tically does not change, whereas the parameter c decreases.
     通过对XRD的分析证实样品均为Sr3Ti2O7型四方结构,空间群为I4/mmm,同时发现晶格参数a随掺杂量x的变化几乎不变,而c随x的增加则明显减小。
短句来源
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  相似匹配句对
     Structure, Symmetry and Lattice Dynamics of Carbon Nanotubes
     碳纳米管的结构、对称性及晶格动力学
短句来源
     SYMMETRY OPERATION AND LATTICE VIBRATION IN CUBIC CRYSTAL
     立方晶体的对称操作与晶格振动
短句来源
     Methods: The Symmetry(?)
     方法:Symmetry(?)
短句来源
     The Upgrade Lattice
     提升格
短句来源
     On the Symmetry of Plane
     关于平面的对称
短句来源
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  lattice symmetry
Isotopic lattice symmetry: An unexplored area of research
      
Calculations are performed with and without consideration of the displacement of anion atoms not changing the crystalline-lattice symmetry.
      
In freeze-fracture replicas, an array of particles and pits with a similar lattice symmetry and spacing to the arrays of hemispherical densities is demonstrated.
      
Percolation methods are used to analyze the sizes of the connected components of level sets {x:ψ(x)=h} and sets {x:ψ(x)≦h} in several classes of random fields with lattice symmetry.
      
Percolation of level sets for two-dimensional random fields with lattice symmetry
      
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The Redox property and reduction procedure of transition metal ions of B-site mired perovskite-type oaldes LaMyMO3(M、M'=Mn' Fe、Co) were studied employing TPR, XRD and XPS techniques.The reduction of LaMnO3 and LaCoO3 as well as Mn-rich and Co-rich samples proceeds on two stages,each corresponding to the reduction of the higher valent ion to the lower. The lattice framework could be maintained in the first stage for the reduction of Mn(4+) and Co(3+), but the lattice symmetry and the defect concentration...

The Redox property and reduction procedure of transition metal ions of B-site mired perovskite-type oaldes LaMyMO3(M、M'=Mn' Fe、Co) were studied employing TPR, XRD and XPS techniques.The reduction of LaMnO3 and LaCoO3 as well as Mn-rich and Co-rich samples proceeds on two stages,each corresponding to the reduction of the higher valent ion to the lower. The lattice framework could be maintained in the first stage for the reduction of Mn(4+) and Co(3+), but the lattice symmetry and the defect concentration could be changed. The reduction of lower valent ions (Mn(3+), Co(2+)) in the second stage would destroy the lattice framework and there appeared in the reduced products La2O3, MnO and Co. The reduction of LaFeO3 and Fe-rich samples was complicated. The crystal structure could be maintained when the reduction temperature was below 1123K, which was mainly due to the change of defect concentration and the decrease of higher valent ions. The doping with foreign ions in.B-site and the interaction between defferent transition metal ions could modify, on some extent relating to thecrystal structure, the redox property and the reduction temperature. The Redox property of Mn, Fe, Coions could be expressed as the following equations:

用TPR、XRD和XPS手段研究了B位二元复合钙钛矿型复合氧化物LaMyMO3(M、M’=Mn、Fe、Co;y=0.0~1.0)中过渡金属离子的氧化还原性能和还原过程·LaMnO3和LaCoO3及富Mn和富Co样品的还原分为两步:第一步对应于高价过渡金属离子的还原,且不破坏钙钛矿的骨架结构,但可使晶体的对称性及缺陷浓度发生改变;第二步还原使钙钛矿结构破坏,还原产物中出现单元氧化物和金属单质如La2O3、MnO、Co.LaFeO3和富铁样品的还原过程比较复杂,温度低于1123K时结构基本保持不变,此温度范围内的还原主要是缺陷浓度的变化和高价金属离子数量的减少,第二种离子的加入及其之间的相互作用对样品的还原温度和氧化还原性能有明显的影响,这种影响的程度与样品的结构有关.Mn、Fe、Co离子的氧化还原性能的强弱可用如下的反应表示:

Abstract Orientational transitions in solid C70 have been studied in terms of rotator functions which the molecular symmetry D5h and the fee lattice symmetry O^are taken into account. An intermolecular interaction model is proposed, considering both atom-atom Lennard-Johns potentials and Coulombic forces resulting from high-electron density regions along edges and low-electron density regions at the centers of pentagons and hexagons of the molecule. The disappearance of coupling of the active modes T1g...

Abstract Orientational transitions in solid C70 have been studied in terms of rotator functions which the molecular symmetry D5h and the fee lattice symmetry O^are taken into account. An intermolecular interaction model is proposed, considering both atom-atom Lennard-Johns potentials and Coulombic forces resulting from high-electron density regions along edges and low-electron density regions at the centers of pentagons and hexagons of the molecule. The disappearance of coupling of the active modes T1g of l=2 and T1u of l= 5 manifolds results in two orientational transitions at 330K and 270K, respectively. The calculated values agree with experimental values.

本文利用转子函数研究了固体C_(70)的取向相支,转子函数同时兼顾了分子的D(5h)对称性以及面心立方晶格的Oh对称性.我们提出的分子间相互作用势模型除考虑了原子一原子间Lennard-Jones势的基本作用外还特别注意到了库仑作用,它是由不同分子上沿键的富电荷区与五边形、六边形中心缺电荷区的相互作用引起的,计算表明,l=2的T(2g)模的模间耦合的消失及l=5的T1u(2)模间耦合的消失分别对应该体系330K和270K处发生的两次取向相变,由此计算出的取向相变温度与实验值相当.

The luminescent properties of Tb~(3+) in rare earth orthoborates LnBO3(Ln=Y, Gd and La) under VUV excitation were studied. From Y-Gd-La. with the increasing of the canon radii and the lowering of the lattice symmetry, the lowest 4f75d levels of Tb~(3+) hift to higher energy. The influence of the concentration of Tb~(3+) on the emission of Tb~(3+) and the energy transfer between Ce~(3+) and Tb~(3+) in LaBO3: Ce, Tb were discussed too. It was found that the emission of Tb~(3+) in LaBO3: Ce, Tb is enhanced...

The luminescent properties of Tb~(3+) in rare earth orthoborates LnBO3(Ln=Y, Gd and La) under VUV excitation were studied. From Y-Gd-La. with the increasing of the canon radii and the lowering of the lattice symmetry, the lowest 4f75d levels of Tb~(3+) hift to higher energy. The influence of the concentration of Tb~(3+) on the emission of Tb~(3+) and the energy transfer between Ce~(3+) and Tb~(3+) in LaBO3: Ce, Tb were discussed too. It was found that the emission of Tb~(3+) in LaBO3: Ce, Tb is enhanced by Ce~(3+) when excited by UV, but it is killed by Ce~(3+) when excited by VUV. The experiment results show that LaBO3; Tb will be potential green phosphorus excited by VUV radiation.

报导了Tb3+、Ce3+激活的稀土正硼酸盐的真空紫外光谱。分析了Ce3+的4f75d能级随基质结构、基质阳离子的变化,讨论了温度、Tb3+离子的浓度对发光的影响以及Ce3+-Tb3+间的能量传递.

 
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