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composites
相关语句
  复合材料
    Piezoelectric Composites
    压电复合材料
短句来源
    Processing Synthetic Polycrystal Diamond and Diamond-Hard Alloys Composites with Electric Spark
    电火花加工人造金刚石多晶和金刚石—硬质合金复合材料
短句来源
    MECHANICAL PROPERTIES OF MULLITE-BASED COMPOSITES
    莫来石基陶瓷复合材料的力学性能
短句来源
    THE MECHANICAL PROPERTIES OF ZrO_2-Al_2O_3 CERAMIC COMPOSITES
    ZrO_2-Al_2O_3系陶瓷复合材料力学性质
短句来源
    Preparation and Properties of ZTM/Y-TZP Composites
    ZTM/Y-TZP复合材料的制备及性能
短句来源
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  “composites”译为未确定词的双语例句
    Study on Performance of Alkali-activated Waste Residue Composites (AAW) Concrete
    碱激发复合渣体(AAW)混凝土的性能研究
短句来源
    STUDY ON HIGH-TEMPERATURE STABILITY OF SiC_w/ZTM COMPOSITES
    SiC_w/ZTM材料高温稳定性研究
短句来源
    THE INTERFACIAL STRUCTURE AND REACTION OF CARBON FIBER/LITHIUM ALUMINUM SILICATE GLASS-CERAMIC COMPOSITES
    碳纤维/锂铝硅(LAS)玻璃陶瓷的界面结构及界面反应
短句来源
    Properties of Solder Glass Composites Consisting of PbO-ZnO-B_2O_3 Glass and β-Eucryptite
    PbO-ZnO-B_2O_3玻璃和合成β-锂霞石的复合焊料玻璃性质
短句来源
    Application and Study of Ceramic Composites for Break Rings
    复合陶瓷材料及分离环的研究与应用
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  composites
In this paper, the so-called approximate convexity and concavity properties of generalized Gr?tzsch ring function μα(r) by studying the monotonicity, convexity or concavity of certain composites of μα(r) are obtained.
      
Preparation and properties of polymer and quantum dot composites
      
The prepared composites were characterized with UV-Vis, PL, TEM, FTIR, CLSM and conductance titration etc.
      
Spectra results indicated that there existed interactions between nanocarbon and the polymethyl methacrylate (PMMA) matrix, which was consistent with the decrease in glass transition temperature of the composites with increase of carbon content.
      
TEM images revealed that a carbon encapsulated core/shell structure was formed in the composites, which could ensure good dispersion of carbon nanoparticles within the PMMA matrix.
      
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A prelimlnary investigation of cementing materials used in ancient China has beencarried out. Analysis of the samples collected showed that there were various kinds oforganic materials such as glutinous rice, tung oil and animal blood mixed with limewhich imparted to their cementition property. The types and ages of these cementing ma-terials are discussed.It is worth mentioning that the employment of composites of organicand inorganic materials for the building engineering had marked an important develop-ment...

A prelimlnary investigation of cementing materials used in ancient China has beencarried out. Analysis of the samples collected showed that there were various kinds oforganic materials such as glutinous rice, tung oil and animal blood mixed with limewhich imparted to their cementition property. The types and ages of these cementing ma-terials are discussed.It is worth mentioning that the employment of composites of organicand inorganic materials for the building engineering had marked an important develop-ment of cementing materials in ancient China.

本文通过对作者采集到的我国古代建筑工程中所使用的胶凝材料样品进行分析,简要地介绍了中国古代使用胶凝材料的种类、性能以及它们产生的大致年代。初探表明:在石灰中掺加某些有机物质(诸如糯米、桐油、血料等)获得的一类有机-无机复合胶凝材料,是我国古代胶凝材料发展史上的一个重要特点。

This paper presents the piezoelectric composites, their connectivities and preperations. The properties and applications of the composites with different connectivities are also described briefly.

本文介绍了压电复合材料以及它们的连通性和制备方法。对不同连通的复合材料的性能和用途也作了简要的说明。

In order to prepare fibre-reinforced Si_3N_4 ceramic composites, the hot pressing temperature must be reduced to allow the coexistence of the fiber and the matrix withou(?) damaging the fiber. Additives of LiF-MgO-SiO_2 system were selected so that the ho(?) pressing temperature can be reduced to 1450℃, and densification can acheive more than 39% of the theoretical density.In this paper, the sintering mechanism of Si_3N_4 by hot pressing at such temperatures is studied. It is found that it fits well to...

In order to prepare fibre-reinforced Si_3N_4 ceramic composites, the hot pressing temperature must be reduced to allow the coexistence of the fiber and the matrix withou(?) damaging the fiber. Additives of LiF-MgO-SiO_2 system were selected so that the ho(?) pressing temperature can be reduced to 1450℃, and densification can acheive more than 39% of the theoretical density.In this paper, the sintering mechanism of Si_3N_4 by hot pressing at such temperatures is studied. It is found that it fits well to the diffusion creep process at the grain boundary in hot pressing as suggested by Cuble. Taking into consideration of the effects of porosity and mold-wall on the effective pressure and regarding the grain boundary thickness as that of liquid phase film on the grains, the Cubic equation may be modified as:ln(1-ρ)=-K(Wσ_A/T)τ+ln(1-ρ_0)Where ρ is the relative density, K is a constant including the grain boundary diffusion coefiicient, σ_A is the applied pressure, W is the thickness of the liquid film, τ is the time, T is the absolute temperature. The experimental results of hot pressing Si_3N_4 containing LiF-MgO-SiO_2 are consistent with the above equation. Furthermore the results also agree with the Kingery model of sintering by hot pressing with the presence of a liquid phage. Through such treatments, it is postulated that the sintering of Si_3N_4 at such lower temperatures can also be accounted by a solution-diffusion-precipitation proeess, where control of the sintering rate by solution-precipitation has been gradually changed to diffusion as the hot pressing temperature is raised. At the same time, it is shown that phase transformation from α-Si_3N_4 to β-Si_3N_4 is not necessarily an accompaning process, α-Si_3N_4 remains as the major phase after densification by hot pressing at such lower temperatures.

为了研制纤维补强氮化硅复合材料,避免纤维与基体的反应而受到损害,必须使氮化硅的热压处理温度降低到两者共存所允许的程度。添加LiF-MgO-SiO_2可以使氮化硅的热压烧结温度降低到1450℃,而致密度达到理论密度的99%以上。 本文初步探索了含LiF-MgO-SiO_2的氮化硅陶瓷低温热压烧结机理,发现它是适合于R.L.Coble提出的在热压烧结中晶界扩散蠕变过程的。考虑到气孔及模壁对有效压力的影响,同时把晶界层厚度理解为界面液相层厚度,可将该过程的方程调整为: ln(1-ρ)=-K(Wσ_A/T)t+ln(1-ρ_0)其中ρ为相对密度;K是包含有晶界扩散系数的常数;σ_A是外加压力;W是液相层厚度;t是时间;T是绝对温度。 含LiF-MgO-SiO_2的氮化硅的热压烧结实验结果与上述方程所预示的基本吻合,同时也符合于W.D.Kingery的有液相参与下的热压烧结方程。通过这些实验结果的处理,可以认为氮化硅的低温热压烧结可以用溶解-扩散-沉淀过程来说明。而当温度提高时,烧结速率的控制则逐渐从溶解-沉淀向扩散转移。同时,在氮化硅的低温热压烧结过程中,并不必须伴随有α到β氮化硅的相变。在低温热压达到致密化之后,在...

为了研制纤维补强氮化硅复合材料,避免纤维与基体的反应而受到损害,必须使氮化硅的热压处理温度降低到两者共存所允许的程度。添加LiF-MgO-SiO_2可以使氮化硅的热压烧结温度降低到1450℃,而致密度达到理论密度的99%以上。 本文初步探索了含LiF-MgO-SiO_2的氮化硅陶瓷低温热压烧结机理,发现它是适合于R.L.Coble提出的在热压烧结中晶界扩散蠕变过程的。考虑到气孔及模壁对有效压力的影响,同时把晶界层厚度理解为界面液相层厚度,可将该过程的方程调整为: ln(1-ρ)=-K(Wσ_A/T)t+ln(1-ρ_0)其中ρ为相对密度;K是包含有晶界扩散系数的常数;σ_A是外加压力;W是液相层厚度;t是时间;T是绝对温度。 含LiF-MgO-SiO_2的氮化硅的热压烧结实验结果与上述方程所预示的基本吻合,同时也符合于W.D.Kingery的有液相参与下的热压烧结方程。通过这些实验结果的处理,可以认为氮化硅的低温热压烧结可以用溶解-扩散-沉淀过程来说明。而当温度提高时,烧结速率的控制则逐渐从溶解-沉淀向扩散转移。同时,在氮化硅的低温热压烧结过程中,并不必须伴随有α到β氮化硅的相变。在低温热压达到致密化之后,在氮化硅试样中α相仍保留为主相。

 
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