查询词典 tetragonal

Using finite difference time domain method, the electromagnetic field distribution of THz wave is simulated in a THz 2D PC splitter and by plane wave expansion method the dispersion relation and defect modes are achieved in a THz rotated PC waveguide.5. A woodpile three-dimensional (3D) PC with face-centered-tetragonal symmetry is one of the most popular 3D PCs because of its favorable band gap characteristics. Based on the woodpile fct lattice structure, we propose a novel woodpile THz lattice structure with comparatively decreased symmetry, better band gap properties and easy fabrication by varying some structure parameters.

计算结果为利用非线性光学差频方法产生THz辐射源的实验研究提供了深入和全面的理论基础；四、利用平面波展开法，通过改变二维THz光子晶体的结构参数，对二维THz光子晶体完全带隙进行了优化，分析出两种适合工作在THz波段的二维光子晶体结构；采用时域有限差分法和平面波展开法，计算出THz波在二维光子晶体"T"型分束波导，45度旋转波导中传输的电磁场分布以及缺陷模；五、Woodpile面心立方四角结构是三维光子晶体中被研究最广泛的结构之一。

The results show that Tc and diamagnetic susceptivity decrease, crystal structure changes from being orthorhorhombic to a tetragonal system with increasing Fe and Co content.

先将一定的化学组份在一定程度上混和，再热处理得到的一般为颗粒超导体；而在热的（100）SrTiO〓衬底上边溅射边成相能够获得单晶的沿C轴外延的YBaCuO薄膜。

Calculated results showed that in the Ni2MnIn phase, the atomic orbital magnetic moment of Mn dominates the unit cell's magnetic moment, i. e., about 85% of the total magnetic moments of unit cells. The contribution of Ni to the total cell's magnetic moments is about 15%. As to the In atoms, they show a weak diamagnetism in both phases. In particular, the phase transformation of tetragonal martensite results in the decrease in Fermi energy of Ni2MnIn unit cells by 0.495 eV.

计算表明：四方马氏体相变导致Ni2MnIn元胞费米能下降0.495eV；Ni2MnIn结构中，In原子具有弱抗磁性，晶胞磁矩为Mn原子轨道磁矩所主导，约占元胞总轨道磁矩85%，Ni原子轨道磁矩贡献约占元胞总轨道磁矩15%。

XRD patterns indicated that the Sn-SBA15 has tetragonal crystal type.SEM images showed that the Sn-SBA15 had a honeycombed surface.

XRD分析表明，Sn-SBA15电极具有四方晶型锡结构；而SEM观察到电极表面的蜂窝状结构。

We also study the relation between the dielectric constant and lattice distortion of the PT tetragonal and cubic phase region.

我们还研究了PT四方相区和立方相区介电常数与晶格畸变的关系。

Substituting Fe by a small amount of metalloid C and Siatoms, the compounds are in tetragonal structure and have uniaxial anisotropy.

少量类金属原子C和Si取代部分Fe，能形成四方结构，且具有单轴各向异性。

The results showed that for 2Y-TZP materials, because of low stabilizer content and small critical transformation size, more tetragonal zirconia could change into monoclinal, better effect of transformation toughening operated, hence higher fracture toughness was obtained.

晶粒尺寸、稳定剂含量对氧化锆陶瓷相变增韧效果具有重要的影响。2Y-TZP材料由于稳定剂含量低，临界相变尺寸也小，在低温烧结条件得到细晶粒情况下，断裂过程中有更多的晶粒达到或超过临界相变尺寸，因而具有更高的断裂韧性。

The microcrystalline strengthening effect is obvious, due to the sample with fine grain size that was wintered at low temperature and owned good bending strength. At the same time, also due to fine grain sizes, only less tetragonal zirconia grain that their sizes exceeded critical phase transformation size and could change into monoclinal phase when suffering stress, indistinct effect of transformation toughening operated, hence lower fracture toughness was obtained.

由于其晶粒尺寸较小，细晶强化的效果非常明显，因此，材料具有较高的抗弯强度；同时，由于晶粒小，只有一部分晶粒可以达到临界相变尺寸，相变增韧的效果不明显，因此试样的断裂韧性较低。

In the simulation, the control of two satellites with different mass (6tons, 9tons) under pentagonal pyramid configuration and tetragonal pyramid configuration has been studied individually by means of zero movement additive.

基于五棱锥构形和金字塔构形两种构形采用零运动添加的方法研究了两种不同质量的卫星(6吨、9吨)的控制情况，表明五棱锥构形的控制力矩陀螺系统能够满足任务要求，姿态稳定度1×10~4°/s，指向精度0.1°。

Furthermore, for the domain structure and the symmetry of domain boundary of this material, analysis of group theory has been made, and the numbers of orientation states of domains, plane indices of domain boundaries and the types of domain boundaries are in agreement with the orientations and types of domain boundaries in tetragonal phase of BaTiO〓 listed by Fousek.

同时，对这种材料中的畴结构及其畴界对称性进行了群的分析，由此所确定的畴取向态数，畴界面指数以及畴界类型与Fousek等根据弹性相容性条件所列出的钛酸钡四方相中畴界类型和取向完全吻合。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。