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composites
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  复合材料
    Interfacial Design and Structural Properties of Kevlar Fiber Reinforced Nylon 6 Composites
    Kevlar纤维增强尼龙6复合材料界面层的设计及其结构性能研究
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    Preparation and Mechanical Properties of Self-reinforced Polyethylene Composites
    聚乙烯自增强复合材料的制备与力学性能研究
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    Study on the Structure and Properties of Multi-walled Carbon Nanotubes/Epoxy Resin Composites
    多壁碳纳米管/环氧树脂复合材料结构与性能的研究
短句来源
    Structure and Properties of Multi-walled Carbon Nanotubes/Polyamide 6 Composites
    碳纳米管/尼龙6复合材料的结构与性能研究
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    Study on the Preparation and Mechanism of Flame Retardant and Cross-linked Polyethylene Composites
    阻燃和交联聚乙烯复合材料的制备与机理研究
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    Study on Antistatic HDPE Composites
    抗静电高密度聚乙烯的研究
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    A Study of Phase Morphology of NBR-Nylon Thermoplastic Elastomeric Composites
    NBR PA热塑性弹性体相畴形态的研究
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    Structures and Properties of In-Situ Composites of LC70 / PET
    热致液晶(LC70)/PET共混物的结构与性能
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    Study on the Melt Fluidity of Nylon Short Fiber-PVC Composites
    尼龙短纤维增强PVC流动性研究
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    Research and Advance of Nylon-6 Molecular Composites
    分子复合型尼龙──6合金材料的研究进展
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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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By using bicycle [2. 2. 1] hept-5-ene-2, 3-dicarboxylic acid ethyl ester, benzonphe-nonetetracarboxylic acid diethyl ester and methylene dianiline as monomers and ethanol as solvent "PMR" polyimide was synthesized. This type of polyimide is suitable for preparation of composites. The results of isothermal aging at 300℃ indicated that the glass cloth reinforced plastic of this polyimide can be used in the range of 250-300℃ for long period. It has been verified that the ester-ammonium salt was formed in...

By using bicycle [2. 2. 1] hept-5-ene-2, 3-dicarboxylic acid ethyl ester, benzonphe-nonetetracarboxylic acid diethyl ester and methylene dianiline as monomers and ethanol as solvent "PMR" polyimide was synthesized. This type of polyimide is suitable for preparation of composites. The results of isothermal aging at 300℃ indicated that the glass cloth reinforced plastic of this polyimide can be used in the range of 250-300℃ for long period. It has been verified that the ester-ammonium salt was formed in the resin solution as soon as the monomers were mixed. The separation of the resin solution in ethanol into two layers was overcome. The reaction mechanism of "PMR" polyimide, such as amidation, imidation and crosslinking, were studied.

合成了以乙醇为溶剂,双环[2.2.1]庚-5-烯-2,3-二羧酸乙酯、二苯甲酮四酸二乙酯和4,4’-二胺基二苯甲烷为单体的“PMR型”聚酰亚胺树脂。此树脂适用于制备复合材料。300℃恒温热老化实验表明,与玻璃布复合的增强塑料可在 250℃—300℃ 下长期使用。实验证明树脂溶液是单体的酯铵盐溶液,解决了树脂溶液分层的问题。初步研究了酰胺化、酰亚胺化和交联反应的历程。

A kind of thermosetting phenolic resin was prepared by the condensation of linear phenolic resin (Novolak) with formaldehyde. It exhibts higher carbon content lower modulus and similar thermal stability as compared with ordinary thermosetting phenolic resin, and can be used for preparation of composites.

用线型酚醛树脂与甲醛作用制得一种热固性酚醛树脂,与一般热固性酚醛树脂比较,它的碳含量较高,模量较低,热稳定性相似,可以用于制备复合材料。

Wood extractives exhibit significant effects on wood properties and hence its utilization. They also play an important role on the chemota-xonomy of tree species. Wood extractives are not only closely correlated to the characteristic color, odor, taste and durability of wood, but can also profoundly affect a number of physical, mechanical, and chemical properties of wood. Therefore, wood extractives are largely responsible for the processing and utilization of wood.Wood extractives can reduce the shrinkage and...

Wood extractives exhibit significant effects on wood properties and hence its utilization. They also play an important role on the chemota-xonomy of tree species. Wood extractives are not only closely correlated to the characteristic color, odor, taste and durability of wood, but can also profoundly affect a number of physical, mechanical, and chemical properties of wood. Therefore, wood extractives are largely responsible for the processing and utilization of wood.Wood extractives can reduce the shrinkage and recovery of wood during drying, enhance the dimensional stability of wood, and contribute to resistance to insect and fungal attack. In some instances, wood extractives from a coating on the cell wall and over the pit apertures, interfering with the permeability and penetrability of the wood. So that the shrinkage during drying on one hand, and the penetration of some preservative chemicals on the other, can be affected.In wood board industries, wood extractives can hinder the satisfactory adh of the glue to the wood surface or they may react with the glue to prevent satisfactory polymerization and setting. Sugars, tannins, and phenolic extractives can affect the hardening of cement in the manufacture of wood-cement boards. Also, certain wood extractives can affect the polymerization of the plastic component of wood-plastic composites.The presence of polyphenolic extractives in the cell contents can significantly affect both the behavior of wood during pulping, and the behavior of pulp during the manufacture of paper. Some inhibit pulping reactons, increase chemical consumption, reduce the yield of pulps and lower its quality, cause considerable color changes and increase bleach requirements, and also affect the recovery of pulping chemicals. Pitch problems and loss of absorbency in wood pulps are also due to the extractives. Some accelerate the blocking of pipes and corrosion of pulping -equipments.An in depth study of wood extractives will provide a better understanding of their effects on wood perties and will also assist the wood "industries to adopt effective approach in controlling or reducing their deleterious effects. In addition,there is evidence that the more rapid the growth , the lower the extractives contents, so that silvicultural and forest management practices may be used to overcome the deleterious extractives problems.

木材浸出物对于木材材性和木材利用都有重要影响,而且在树木化学分类上也有重要意义。木材浸出物不仅与木材的色、香、味和腐朽性有着密切关系,而且对于木材的物理力学性质和化学性质都有重要影响,因而对于木材的加工和利用关系极大。 木材浸出物能减少木材的干缩,增强木材的尺度稳定性,并赋予木材抵抗病虫侵害的能力。沉积在细胞壁和纹孔口上的浸出物,阻碍了木材的渗透性与可浸注性,因而影响了木材的干燥和防腐处理。 在人造板工业中,木材浸出物常影响胶合剂的有效胶着或胶的聚合固化。糖类、单宁和酚类浸出物能影响水泥刨花板制造过程中水泥的凝固。有些木材浸出物还能影响木材塑料复合材(WPC)中塑料的聚合。 木材组织中含有的多元酚类浸出物,在制浆和造纸过程中,都有重要影响。有些能抑制制浆反应,增加药物消耗,井降低纸浆得率和质量,颜色深暗,不容易漂白,而且影响制浆药物的回收。纸浆的树脂障碍和吸收性能也都受木材浸出物的影响。有些多元酚类浸出物并能与制浆药物中的碱土金属形成不溶的络合物,堵塞管道,加速制浆设备的腐蚀。 对木材浸出物的深入研究,将能较充分地了解木材浸出物对于木材材性的影响,也将有助于木材工业采取有效措施,控制或减少这些有害影响。此外,...

木材浸出物对于木材材性和木材利用都有重要影响,而且在树木化学分类上也有重要意义。木材浸出物不仅与木材的色、香、味和腐朽性有着密切关系,而且对于木材的物理力学性质和化学性质都有重要影响,因而对于木材的加工和利用关系极大。 木材浸出物能减少木材的干缩,增强木材的尺度稳定性,并赋予木材抵抗病虫侵害的能力。沉积在细胞壁和纹孔口上的浸出物,阻碍了木材的渗透性与可浸注性,因而影响了木材的干燥和防腐处理。 在人造板工业中,木材浸出物常影响胶合剂的有效胶着或胶的聚合固化。糖类、单宁和酚类浸出物能影响水泥刨花板制造过程中水泥的凝固。有些木材浸出物还能影响木材塑料复合材(WPC)中塑料的聚合。 木材组织中含有的多元酚类浸出物,在制浆和造纸过程中,都有重要影响。有些能抑制制浆反应,增加药物消耗,井降低纸浆得率和质量,颜色深暗,不容易漂白,而且影响制浆药物的回收。纸浆的树脂障碍和吸收性能也都受木材浸出物的影响。有些多元酚类浸出物并能与制浆药物中的碱土金属形成不溶的络合物,堵塞管道,加速制浆设备的腐蚀。 对木材浸出物的深入研究,将能较充分地了解木材浸出物对于木材材性的影响,也将有助于木材工业采取有效措施,控制或减少这些有害影响。此外,事实证明:树木生长越快,木材浸?

 
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