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tetrahedral position
相关语句
  四面体位置
     metals (Fe, W, Mo, Ta and Nb) are evaluated by means of the concept of elastic dipole. The results show that all of them occupy the octahetral positions except H, which in W, Mo, Ta and Nb favours the tetrahedral position, and the critical radius of interstials at which the favoured position is exchanged have been given also.
     计算结果表明,除了H在W,Mo,Ta,Nb中是占据四面体位置外,其余的情况都是占据八面体位置,并求得了判定间隙原子是处在四面体抑八面体位置的临界半径。
短句来源
  相似匹配句对
     The Position
     立场
短句来源
     the tetrad is tetrahedral;
     四面体型四分体;
短句来源
     How to position it?
     如何定位?
短句来源
     The tetra is tetrahedral.
     四面体型四分体;
短句来源
     The position of cross-linking maybe locates on the tetrahedral iron with the formation of Alp-O-Fe bond.
     形成Al_p-O-Fe键.
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  tetrahedral position
The coordination about the zinc atom is tetrahedral with the nitrogen atom of the pyridine molecule in one tetrahedral position and different mixtures of the two halogen atoms in the other three positions.
      
They show that most of the aluminum is located in the tetrahedral position in the present materials.
      
Three different aluminum species in tetrahedral position were observed.
      
It has been found that Fe3+ ions substitute for Si4+ in tetrahedral position, while Fe2+ ions are chargecompensating cations in octahedral sites.
      
Comparison with known Si, Al-O distances indicates that AI must be restricted to the second tetrahedral position.
      


Assuming the metals to be an isotropic, unbounded and homogenous elastic continuum, the tetrahedral and octahedral position energy of interstials (C,N,O and H) in b.c.c. metals (Fe, W, Mo, Ta and Nb) are evaluated by means of the concept of elastic dipole. The results show that all of them occupy the octahetral positions except H, which in W, Mo, Ta and Nb favours the tetrahedral position, and the critical radius of interstials at which the favoured position is exchanged have been given also. The...

Assuming the metals to be an isotropic, unbounded and homogenous elastic continuum, the tetrahedral and octahedral position energy of interstials (C,N,O and H) in b.c.c. metals (Fe, W, Mo, Ta and Nb) are evaluated by means of the concept of elastic dipole. The results show that all of them occupy the octahetral positions except H, which in W, Mo, Ta and Nb favours the tetrahedral position, and the critical radius of interstials at which the favoured position is exchanged have been given also. The activation energies of interstials moving between octahedral positions are calculated. The results are compared favourably with previous experiments.

将金属视为一各向同性的、无限大的、均匀的连续弹性介质,利用弹性偶极子的概念,计算了在体心立方金属Fe,W,Mo,Ta,Nb中,间隙杂质原子C,N,O,H在四面体及八面体位置上的位置能。计算结果表明,除了H在W,Mo,Ta,Nb中是占据四面体位置外,其余的情况都是占据八面体位置,并求得了判定间隙原子是处在四面体抑八面体位置的临界半径。后一部分计算了间隙原子在八面体位置间扩散的激活能。所得的结论都与前人的实验结果较好地接近。

The location of iron in ferrozeosilite (synthesized in a non-alkaline medium in the presence of fluonde) was studied by means of XPS, Mcssbauer, EPR and EPMA. The results indicated that Fe(III) and Fe(II) coexisted in the ferrozeosilite framework and accompanied with a small quantity of Fe compounds presented in pores and cation sides of the zeolite structure. B.E. = 713.2 and 709.7eV in Fe2p3/2 level of XPS, I.S.=0.35, Q.S. =0.38 and I.S. = 0.95,Q.S. =2.37mm/s in the Mossbauer spectra and a signal of g =4.3...

The location of iron in ferrozeosilite (synthesized in a non-alkaline medium in the presence of fluonde) was studied by means of XPS, Mcssbauer, EPR and EPMA. The results indicated that Fe(III) and Fe(II) coexisted in the ferrozeosilite framework and accompanied with a small quantity of Fe compounds presented in pores and cation sides of the zeolite structure. B.E. = 713.2 and 709.7eV in Fe2p3/2 level of XPS, I.S.=0.35, Q.S. =0.38 and I.S. = 0.95,Q.S. =2.37mm/s in the Mossbauer spectra and a signal of g =4.3 in the EPR spectra were assigned to Fe(III) and Fe(II ) isomorphously substituted in the tetrahedral positions. The results also showed the migration of Fe(III) from framework to non-framework positions after calcination. Electron probe microanalysis indicated that the distribution of the lattice atoms was iron-rich in the inner sphere of the ferrozeosilite crystals.

研究了Fe在Ferrozeosilite(在非碱性介质中合成的Fe-ZSM-5)分子筛中的存在状态。XPS和Mossbauer谱表明,Fe以Fe(Ⅲ)和Fe(Ⅱ)两种价态共存于Ferrozeosilite分子筛骨架中,同时伴有少量非骨架Fe的存在。用EPR研究了Ferrozeosilite分子筛的生成过程及灼烧后各种状态Fe的变化和迁移行为。Fe对ZSM-5沸石骨架的同晶取代过程在EPR谱中表现为g=4.3处顺磁共振信号的增强。灼烧后样品EPR谱中g=4.3处信号的减弱和g=2.3处宽谱的出现源于骨架Fe在灼烧过程中的部分迁移行为。EPMA对抛光后的分子筛晶体剖面分析表明,Fe原子在Ferrozeosilite晶体中的分布是内层富集。

Under heating conditions the exchange of Fe~(3+) and Al~(3+) over the tetrahedral positions in alkali feldspar has been studied using EPR. Crystals of albite and sanidine were heated under hydrothermal conditions at 1 kbar between 500 and 900℃ and under dry conditions at 1050℃, respectively. In albite, the Fe~(3+) lines exhibited broadening after heating, but no additional lines due to positions other than T_1(o) occurred at 800℃ for 186 hrs. In sanidine, after heating at 1050℃ for 1300 hrs, the...

Under heating conditions the exchange of Fe~(3+) and Al~(3+) over the tetrahedral positions in alkali feldspar has been studied using EPR. Crystals of albite and sanidine were heated under hydrothermal conditions at 1 kbar between 500 and 900℃ and under dry conditions at 1050℃, respectively. In albite, the Fe~(3+) lines exhibited broadening after heating, but no additional lines due to positions other than T_1(o) occurred at 800℃ for 186 hrs. In sanidine, after heating at 1050℃ for 1300 hrs, the relative intensities of T_1 and T_2 lines changed. From the heating experiments it is concluded that Fe~(3+), Al~(3+) and Fe~(3+), Si~(4+) exchange among the distinct T sites in the lattice of alkali feldspar is distinctly more sluggish than Al~(3+) and Si~(4+).

在加热条件下,利用EPR方法研究了碱性长石中不同四面体位置间的Fe~(3+)、Al~(3+)交换。低温钠长石和透长石晶体分别在水热,1 kbar,500—900℃和干加热,1050℃条件下加热。在低温钠长石中,加热后Fe~(3+)线被加宽,当温度为800℃时,除T_1(o)位置外,没有出现其余四面体位置Fe~(3+)产生的谱线。透长石在1050℃加热1300h后,T_1和T_2线的相对强度发生了变化。实验表明,在碱性长石中不同四面体间Fe~(3+)、Ak~(3+)和Fe~(3+)、Si~(4+)交换与Al~(3+)、Si~(4+)交换比较,前者速度要缓慢得多。

 
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