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晶体结构特性
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  crystal structural characteristics
     The crystal structural characteristics and phase transition of SB pseudoboehmite (particularly with γ-Al_2O_3, δ-Al_2O_3 and θ-Al_2O_3 as representative samples) calcined at 500~1200℃ have been examined by means of XRD, DTA and MAS NMR.
     采用XRD、DTA、MAS NMR测定方法,对SB拟薄水铝石500至1200℃焙烧产物,特别是其中γ Al_2O_3、δ-Al_2O_3和θ-Al_2O_3代表性样品,有关晶体结构特性及变化情况进行了考察。
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  characters of crystal structure
     The total acidity and the number of strong acidic center increase with the decrease of SiO_2/Al_2O_3 ratio. On the other hand,the SiO_2/Al_2O_3 ratio of DG zeolite has less effect on the characters of crystal structure, e.g. framework density and so on.
     此外随着SiO_2/Al_2O_3降低,催化剂总酸度和强酸中心数目增加,另一方面DG分子筛SiO_2/Al_2O_3变化对其晶体结构特性,如骨架密度等影响不大。
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  “晶体结构特性”译为未确定词的双语例句
     Research on Crystal Structure of the Synthesized Mica Containing Zn
     合成含Zn云母的晶体结构特性研究
短句来源
     STRUCTURAL CHARACTERISTICS AND PHASE TRANSITION OF CALCINED SB PSEUDO-BOEHMITE
     SB拟薄水铝石焙烧产物的晶体结构特性及相转变
短句来源
     Has summarized the experimental part, the raw material, the instrument, the complex synthesis.
     简述了实验部分,原料,仪器,配合物的合成。 进行了晶体结构测定,讨论了晶体结构特性,分析了晶体结构图、晶体结构数据。
短句来源
     From the dependence of γ on fi, the expression connecting fi and the deviation coefficient γ for the electronic stopping power of the compound may be obtained.
     因此从C/Eh,γ,e_(pol),对fi三曲线转折点完全一致,可以清晰地看出半导体化合物的价键和晶体结构特性决定了它的一系列物理、化学特性.
短句来源
     The crystallinity and optical properties of ZnO films were investigated with X-ray diffraction(XRD) and the room-temperature photoluminescence(PL) spectra.
     该薄膜的晶体结构特性是由X光衍射谱仪(XRD)所获得的,而其光学特性是由光荧光谱仪(PL)来测的。
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  相似匹配句对
     Crystal Structures and Dielectric Properties of Ferroelectric Ceramics
     铁电体陶瓷的晶体结构及介电特性
短句来源
     Synthesis,Structure and Bonding Features of HfReSi
     HfReSi的合成、晶体结构及成键特性
短句来源
     THE CRYSTAL STRUCTURE OF LAIHUNITE
     莱河矿的晶体结构
短句来源
     Crystal structure of graphite
     石墨的晶体结构
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     Channel Characteristics;
     信道特性 ;
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Physico-chemical properties and catalytic activities of zeolite DG synthesized from different amines are investigated.Experiments show that all of the DG zeolites belong to ZSM-5 class. They have high SiO_2/Al_2O_3 ratio and high framework density. Their constraint index varies from 4 to 7 .They are hydrophobic and selective in p-xylene absorption. In accordance with the amine used, they have slight differences in the above mentioned properties.All the H-form DG catalysts made from DG zeolites have the following...

Physico-chemical properties and catalytic activities of zeolite DG synthesized from different amines are investigated.Experiments show that all of the DG zeolites belong to ZSM-5 class. They have high SiO_2/Al_2O_3 ratio and high framework density. Their constraint index varies from 4 to 7 .They are hydrophobic and selective in p-xylene absorption. In accordance with the amine used, they have slight differences in the above mentioned properties.All the H-form DG catalysts made from DG zeolites have the following properties:space selectivity for toluene disproportionation,m-xylene isomerization and paraffin cracking reactions, i.e.selectivity in forming p-xylene during toluene disproportionation except the one using diethylammonium,prohibition of disproportionation of xylene to form trimethylbenzene and isomerization of m-xylene, selectivity in cracking n-hexane in the presence of 3-methylpentane.The SiO_2/Al_2O_3 ratio of the synthesized DG zeolites, as well as their physico-chemical properties, relates closely with SiO_2/Al_2O_3 ratio of the raw material used.The hydrophobic property and selective absorption capability decrease with the decrease of SiO_2/Al_2O_3 ratio. As a disproportionation catalyst,the catalytic activity increases with the decrease of SiO_2/Al_2O_3 ratio,while the selectivity and disproportionation ratio decrease with it.The total acidity and the number of strong acidic center increase with the decrease of SiO_2/Al_2O_3 ratio.On the other hand,the SiO_2/Al_2O_3 ratio of DG zeolite has less effect on the characters of crystal structure, e.g. framework density and so on.

本文着重考察了在相同条件下用不同有机胺合成DG分子筛的物化性质和催化反应性能。实验表明,用不同胺合成的DG分子筛均为ZSM-5型分子筛。用它们制成HDG催化剂后,用于甲苯歧化、间二甲苯异构化及烷烃裂化反应时均具有择形催化性能。除二乙胺合成的DG分子筛外,其它DG分子筛用于甲苯歧化反应均具有选择地生成对二甲苯的性能;各种DG分子筛对于甲苯歧化和间二甲苯异构化反应均有抑制二甲苯歧化生成三甲苯的能力;对于正己烷和3-甲基戊烷混合物裂化反应则是优先裂解正己烷。在合成DG分子筛时,原料中SiO_2和Al_2O_3分子比不同,生成分子筛的SiO_2/Al_2O_3及物化性质和催化性能也不同。随着SiO_2/Al_2O_3降低,分子筛的憎水性能和选择吸附对二甲苯的性能降低。用于甲苯歧化反应时,催化剂活性增加,而选择性、歧化率降低。此外随着SiO_2/Al_2O_3降低,催化剂总酸度和强酸中心数目增加,另一方面DG分子筛SiO_2/Al_2O_3变化对其晶体结构特性,如骨架密度等影响不大。

Based on the molecular-orbital theory, the secular equation of molecule consisted of two different atoms can be deduced. Solving the above equation, the quantitative expression of the characteristic constant N and A for the linearly combined wave function of the compound and the equation of the bond forming energy or the anti-bond forming energy are obtained. Using the difference between this two energies, the N and A can be related to the average energy gap Eh arised from the symmetric potential V(cov), the...

Based on the molecular-orbital theory, the secular equation of molecule consisted of two different atoms can be deduced. Solving the above equation, the quantitative expression of the characteristic constant N and A for the linearly combined wave function of the compound and the equation of the bond forming energy or the anti-bond forming energy are obtained. Using the difference between this two energies, the N and A can be related to the average energy gap Eh arised from the symmetric potential V(cov), the energy gap C arised from the anti-symmetric potential V(ion) and the total energy gap Eg, hence, the dependence of γ on the fraction of the spectrum ionicity fi and the ratio C/Eh are deduced. From the dependence of γ on fi, the expression connecting fi and the deviation coefficient γ for the electronic stopping power of the compound may be obtained.

本文基于分子轨道法线性组合理论,推导出不同原子组成的分子的久期方程,从而得出分子波函数线性组合的特征常数N和λ的定量关系式,以及成键合能量和反键合能量的方程式.并通过这两能量之差,使N,λ系数与晶体对称势V共价所产生的平均能隙Eb,反对称蛰V离子所产生的能隙C和其总能隙Eg等相联系起来,导出了λ与分数光谱离子性fi和C/Ek比值间的关系式.由λ,N 可导出fi与化合物半导体中离子射程参数间的关系式. 应用上述一些关系式结合闪锌矿和纤锌矿结构特性,可以很好地解释两种结构的偏离系数γ(即化合物半导体中实际电子阻止本领对Bragg电子阻止本领的偏离系数)间互成倒数和压电系数e_(pol)的符号相反的原因.因此从C/Eh,γ,e_(pol),对fi三曲线转折点完全一致,可以清晰地看出半导体化合物的价键和晶体结构特性决定了它的一系列物理、化学特性.

In thin paper, the bow of the silicon sliec isdiuidcd into two cases: the whole bow of the slice and the bo of the crystal plane. By measuring the normal deviation angle between the crystal zurface and the diffraction plane, the new methool that describes the bow of crystal ptane by means of the chaca-cteristics of X-ray polycrystal dffraction instrument and single crystal is desighed. The test of (111) silicon slice that was measured by the new method combined with other method describing the whole bow of silicon...

In thin paper, the bow of the silicon sliec isdiuidcd into two cases: the whole bow of the slice and the bo of the crystal plane. By measuring the normal deviation angle between the crystal zurface and the diffraction plane, the new methool that describes the bow of crystal ptane by means of the chaca-cteristics of X-ray polycrystal dffraction instrument and single crystal is desighed. The test of (111) silicon slice that was measured by the new method combined with other method describing the whole bow of silicon slice shows that the new method is one of the effectiue methods for studying the bow of silicon slice.

本文将单晶硅片的弯曲分成硅片整体弯曲和晶面弯曲两种情况,利用X射线多晶衍射仪和单晶体的结构特性,提出通过确定晶体表面和衍射晶面的法向偏差角来测量晶面弯曲的一种新方法。对(111)硅单晶片的测试表明,将此种方法和其它描述硅片弯曲的方法结合起来,可以成为研究硅片弯曲的有效工具之一。

 
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