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arrays
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  阵列
    Synthesis of One-Dimensional Nanotube Arrays with Template-Based Method
    模板法合成一维纳米管阵列
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    Atomic force microscope analysis shows the effect of anodizing time and thermal treatment on the porous alumina structure film, after anodized for 3h, ordered nanopore arrays were obtained within domain of 0.3 μ m2, when anodized for 24h, the domain of ordered arrays extends to -1 μ m2. Then the sample ultrasonic rinsed in polyethylene was tried and thermal treated at temperature 600-700℃ for 3h.
    通过原子力显微技术分析氧化时间及热处理条件对多孔氧化铝膜结构的影响,阳极氧化3h后,在0.3 μm2范围内获得了有序的纳米孔阵列,当氧化时间延长至24h,有序孔阵列范围增加至-1 μm2.将在聚乙烯中经过超声振荡过的样品在600-700℃中热处理3h.
    β-FeOOH nanowire arrays with diameters of 50 - 200 nm were fabricated by electrochemical deposition using two-step anodic porous alumina templates.
    用电化学方法在多孔氧化铝模板中合成了直径50-200 nm的β-FeOOH纳米线阵列
    The ZFC and FC curves carried on SQUID magnetometry show that these nanowire arrays exhibit spin-freezing phenomena at low temperature and the blocking temperature TB is about 20 K.
    用SQUID MPMS测量ZFC-FC曲线发现不同直径的纳米线阵列在低温下具有自旋冻结现象,阻截温度TB约为20 K。
    The temperature-dependent magnetization curves show that the Neel transition temperatures TN are about 25 K, which is much lower than 290 K observed on bulk materials. Except for 50 nm nanowire arrays, the TB and TN are almost independent on the diameter of the nanowires.
    观测磁化强度与温度的关系曲线发现Neel温度TN约为25 K,远远低于块体材料的Neel温度 (约290 K),除了直径50 nm的纳米线阵列外,直径对TB与TN的影响很小。
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    PBST (0.80/0.20/0.05) ferroelectric films are good materials for uncooled infrared focal plane arrays (UFPA) because of their appropriate diffusion phase region, appropriate Tmax, smaller frequency diffusion and better properties of dielectricity and ferroelectricity than BST films.
    薄膜的介电、铁电性增强。 PBST(0.80/0.20/0.05)薄膜具有适当的相变温区、合适的Tmax值、较小频率色散及比BST薄膜更为明显的介电峰与铁电性等特征,可以作为UFPA系统的探测材料。
    The morphology and crystalloid structure of zinc oxide nanowire arrays were characterized by SEM, TEM and XRD.
    用扫描电镜(SEM)、透射电镜(TEM)和X射线衍射仪(XRD)对氧化锌纳米线的形貌、结构以及相组成进行了分析。
    Preparation and Photoluminescent Properties of β-Ga_2O_3∶Dy Nanorod Arrays
    β-Ga_2O_3∶Dy~(3+)纳米棒束的制备和光致发光性质
短句来源
    Fabrication and properties of the CoNiMnP permanent magnet arrays for MEMS devices
    MEMS微器件用CoNiMnP永磁体薄膜的工艺制备和性能研究
短句来源
    Computer simulation and the density functional theory (DFT) are used in this work to study the adsorption of simple molecules and their phase behaviors in cylindrical pores of MCM-41 and in single walled carbon nanotubes (SWNTs) arrays.
    本文应用计算机模拟和密度泛函理论研究了简单流体分子在圆柱状孔MCM-41和单壁碳纳米管束(SWNTs)中的吸附及相行为。
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  arrays
A replacement scheme on the construction of orthogonal arrays
      
A method of constructing orthogonal arrays is presented by Zhang, Lu and Pang in 1999.
      
In this paper, the method is developed by introducing a replacement scheme on the construction of orthogonal arrays, and some new mixed-level orthogonal arrays of run size 36 are constructed.
      
Fe0.3Co0.7 nanowire arrays were prepared by electrodeposition into the porous anodic aluminum oxide templates.
      
Annealing can improve the coercively of the nanowire arrays.
      
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The phase structures of four Cu-Zn-Al shape memory alloys with e/a rang-ing from 1.44 to 1.46 have been investigated using X-ray diffraction andtransmission electron microscopy. The analyses of both X-ray and electrondiffraction patterns indicate that β_1 parent phase has DO_3 order structure andthat β_1 martensite has M18R structure for each alloy. It is found that allsuperlattice spots split into spot arrays of equal spacing in a certain direc-tion and an antiphase domain boundary exists in the DF image...

The phase structures of four Cu-Zn-Al shape memory alloys with e/a rang-ing from 1.44 to 1.46 have been investigated using X-ray diffraction andtransmission electron microscopy. The analyses of both X-ray and electrondiffraction patterns indicate that β_1 parent phase has DO_3 order structure andthat β_1 martensite has M18R structure for each alloy. It is found that allsuperlattice spots split into spot arrays of equal spacing in a certain direc-tion and an antiphase domain boundary exists in the DF image of superlat-tice reflection, indicating that Cu-Zn-Al martensite alloys exist in phasedomain structure. As a crystal deflect, the antiphase domain boundary willinfluence the continuous extension of fault area in the β_1′ martensite.

本文利用X射线衍射和透射电子显微术研究了电子浓度为1.44—1.46之间的四种Cu-Zn-Al形状记忆合金。X射线衍射和迭区电子衍射花样证明,四种合金的母相(β_1)均为DO_3有序结构,马氏体相(β’_1)为M18R结构。本工作发现超结构衍射斑点在确定方向上分裂成等间距的点列,和超结构反射暗场象的反相畴界,表明Cu-Zn-Al马氏体合金具有相畴结构。反相畴界作为一种晶体缺陷影响马氏体中层错区域的连续延伸。

Engineering materials always contains defects, such as dislocations, inclusions, cracks---, and many material physical properties are considerably changed by their presence. Specific investigations of their effects on the mechanical properties of materials can be backdated to Taylor's work on dislocations (1934 ( 1 )) , Eshel-by's elegant method on inclusions (1961 (2)) ,Bristow's study on microcracked solids (1960 (3)) , and Hashin and Shtrikman's powerful variational principle on inhomogeneous materials (1962...

Engineering materials always contains defects, such as dislocations, inclusions, cracks---, and many material physical properties are considerably changed by their presence. Specific investigations of their effects on the mechanical properties of materials can be backdated to Taylor's work on dislocations (1934 ( 1 )) , Eshel-by's elegant method on inclusions (1961 (2)) ,Bristow's study on microcracked solids (1960 (3)) , and Hashin and Shtrikman's powerful variational principle on inhomogeneous materials (1962 ( 4 )) .]t is known, however, that those non-statistical approaches do give reasonable estimates for the effective mechanical properties for some defectuous materials but they fail for others.This is due to the fact that the periodic defect array model or random model used in these approaches does not accurately represent the micro-structure of the material.Some improved models accounting for the material micro-structure are tnerefore needed. In real materials,too the different types of defects often co-exist. However, each of them was treated in a different way. It would be therefore convenient to find. a unified approach for the treatment of different types of defects.The purposes of this paper are concerned with the answering to these two problems. Using the approach of elastic multipole modeling of defects originated by Siems (5) , Kovacs (6) , Zhon. and Hsieh (7,8) , we develop accordingly a statistical theory based on micromechanics analysis which would make it possible to set up a bridge between the macroscopic continuum approximation and the discrete microstructure of micro-defects, and to derive the macro-properties of all types of solid defects from a common basis.Two illustrations are given. The first one is concerned with the study of the interaction of a macrocrack with distributed microcracks in an elastic solid.In this problem, the usual assumption of a uniform effective field for the treatment of cracked solids (see Hill (9) and Budiansky (10))may be not suitable since the existence of the macrocrack in a microcracked solid makes the stress field near the macrocrack tip varies rapidly. This has been noticed by Chudnovsky and Kachanov (1983 (11)) who studied the two-dimensional interaction of a crack with a field of microcracks distributed in the vicinity of the main crack, and by Zhon and Hsieh-(1984(l2))who gave the results of three-dimensional interaction of a crack with a field of micro-defects(including microcracks)in an elastic solid. These considerations based on a generalized self-consistent method, in which the effective stress field may be non-usiform, however arrived at a system of linear algebraic equations for the determination of large number of unknown-values of effective stress fields at the defect "centers" although they can be solved exactly in principle. Through this statistical theory, an attempt is made to reduce such a phenomenon resulting from the analysis of any discrete microstructure system to an appropriate macroscopic continuum approximation.In the case of the interaction problem, the system of discrete linear algebraic equations is reduced to a self-consistent linear integral equation for the determination of the average effective stress field, which may be solved more easily.The second application is concerned with the determination of effective elastic moduli of solids with micro-defects which maybe statistically inhomogeneous.

工程材料或多或少地含有某些缺陷,如位错,夹杂物,裂纹等等。这些缺陷的存存,往往严重地影响材料的物理性质。关于缺陷对材料机械性质的影响的专门研究可以追溯到1934年Taylor关于位错的工作,1961年Eshelby处理非均匀夹质物的巧妙方法,1960年Bristow关于含有微观裂纹的弹性体的研究以及1962年Hashin和Shtrikman处理非均匀弹性材料的变分原理。 我们知道这些非统计的方法确实能对某些含有缺陷的材料的有效机械性质给出合理的估计,但是在另外一些情形它们却不适用。这是由于在这些方法中所使用的缺陷的周期分布或均匀随机分布的假定并不真实地反映了材料的微观结构。因此有必要研究某种能考虑到材料微观结构的模型。此外,在实际材料中,不同类型的缺陷往往同时存在。可是以往处理不同的缺陷却要使用不同的方法。因此寻找出一种统一处理的方法可以使问题得以简化。 本文的目的就是要试图解决这两个问题。使用由Siems,Kovacs以及Zhou和Hsieh等发展起来的模拟缺陷的弹性多极子方法,对应地我们发展一个基于微观力学分析的统计理论。这个理论使我们有可能在缺陷的离散微观结构与宏观的连续近似之间建立起一座桥梁,并且可以...

工程材料或多或少地含有某些缺陷,如位错,夹杂物,裂纹等等。这些缺陷的存存,往往严重地影响材料的物理性质。关于缺陷对材料机械性质的影响的专门研究可以追溯到1934年Taylor关于位错的工作,1961年Eshelby处理非均匀夹质物的巧妙方法,1960年Bristow关于含有微观裂纹的弹性体的研究以及1962年Hashin和Shtrikman处理非均匀弹性材料的变分原理。 我们知道这些非统计的方法确实能对某些含有缺陷的材料的有效机械性质给出合理的估计,但是在另外一些情形它们却不适用。这是由于在这些方法中所使用的缺陷的周期分布或均匀随机分布的假定并不真实地反映了材料的微观结构。因此有必要研究某种能考虑到材料微观结构的模型。此外,在实际材料中,不同类型的缺陷往往同时存在。可是以往处理不同的缺陷却要使用不同的方法。因此寻找出一种统一处理的方法可以使问题得以简化。 本文的目的就是要试图解决这两个问题。使用由Siems,Kovacs以及Zhou和Hsieh等发展起来的模拟缺陷的弹性多极子方法,对应地我们发展一个基于微观力学分析的统计理论。这个理论使我们有可能在缺陷的离散微观结构与宏观的连续近似之间建立起一座桥梁,并且可以使我们从一个共同的基础上导出各种类型的缺陷体的宏观性质。 作为这个理论的具体应用,文中

The influence of recrystallization process on the grain structure which in turn on the stress-rupture property of alloy ODS-MGH956 was investigated in the present work. The experimental results indicated that only when the recrystallization temperature was over 1200℃ did the arrays of crystalline orientation evidently display. The effect of Grain Aspect Ratio (GAR) of recrystallization structure on the high temperature stress-rupture property of the alloy was remarkable. The optimum GAR values 4-6 correspond...

The influence of recrystallization process on the grain structure which in turn on the stress-rupture property of alloy ODS-MGH956 was investigated in the present work. The experimental results indicated that only when the recrystallization temperature was over 1200℃ did the arrays of crystalline orientation evidently display. The effect of Grain Aspect Ratio (GAR) of recrystallization structure on the high temperature stress-rupture property of the alloy was remarkable. The optimum GAR values 4-6 correspond to the best stress-rupture property.

本文介绍试验研究再结晶处理对ODS-MGH956合金组织及其对持久性能的影响。试验结果表明,再结晶温度超过1200 ℃时才能得到明显可见的定向排列晶粒组织,而且再结晶组织的晶粒纵横比(L/D)对合金的高温持久性能有明显的影响。对应于最好持久性能的最佳晶粒纵横比为4~6。

 
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